Title of Invention	A METHOD FOR MAKING UPPER AND LOWER MOLDS AND AN APPARATUS THEREOF
Abstract	The purpose of this invention is to provide a method for making upper and lower molds and an apparatus therefor that can prevent the resulting molds from being warped and match-plates from being broken. The method of this invention comprises the step of holding a match-plate 1 between cope and drag flasks 2 and 3, inserting upper and lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks 2 and 3, which openings are opposite to the match-plate 1, so as to define upper and lower molding spaces, supplying molding sand to the upper and lower molding spaces, and then causing the upper and lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze the molding sand and make upper and lower molds, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance.

Title of Invention

A METHOD FOR MAKING UPPER AND LOWER MOLDS AND AN APPARATUS THEREOF

Abstract

The purpose of this invention is to provide a method for making upper and lower molds and an apparatus therefor that can prevent the resulting molds from being warped and match-plates from being broken. The method of this invention comprises the step of holding a match-plate 1 between cope and drag flasks 2 and 3, inserting upper and lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks 2 and 3, which openings are opposite to the match-plate 1, so as to define upper and lower molding spaces, supplying molding sand to the upper and lower molding spaces, and then causing the upper and lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze the molding sand and make upper and lower molds, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance.

Full Text	[Technical field] The present invention relates to a method for making upper and lower molds arid an apparatus therefor. [Background of the Invention] Some methods for making upper and lower molds are publicly known. One of them comprises the steps of holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and dragilasks, which openings are opposite to the match-plate, thereby defining upper and lower jaaolding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the mateh£lsfte 1br squeezing the molding sand in the upper and lower molding spaces so as to make flaskless upper and lower molds ;(see International Publication No. WO2005/05825A1). [Disclosure of the Invention] However, the conventional method for making upper and lower molds that comprises the above steps may cause differences between the pressures that are applied to the upper and lower squeezing means when the squeezing means are caused to move forward to the match-plate, because of the differences of the forward speeds or pressures of upper and lower squeezing means, because of the difference of patterns of both sides of a match-plate, because of the difference of the thicknesses of the upper'and lower molds, because of the difference of the densities of molding sand being filled in upper and lower molding spaces, etc. Therefore, the upper and lower squeezing pressures given by the driving means, which pressures cause the upper and lower squeezing means to mo ye forward, may become different, and-if so, one of the pressures will become very strong. Accordingly, the method- has problems such that the resulting mold may-be warped, or, at worst, the match-plate may be broken. This invention' was created to resolve these drawbacks. Its'purpose is' to. provide a method for making upper and lower molds and an apparatus therefor that can prevent the resulting mold from being warped and the match-plate from being broken. 1 To this end, the method for making the upper and lower molds of claim 1 comprises'the steps of holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby'defining upper and lower molding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the match-plate for squeezing the molding sand in the upper and lower molding spaces, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate, the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance. Also, the apparatus for making the upper and lower molds of claim 2 is one for holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby-defining upper and lower molding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the match-plate for squeezing the molding sand in the upper and lower molding spaces. The apparatus comprises upper and lower driving means that cause the respective upper and lower squeezing means to move forward to, and backward from, the match-plate, upper and lower squeezing pressure-measuring means that are installed on the upper and lower driving means and that measure the respective pressures when the sand is squeezed, and a command-transmitting means that determines the difference between the values measured by the upper and lower squeezing pressure-measuring means and compares it to a- predetermined tolerance. If the difference is larger than the tolerance, the command-transmitting means will send a command to the driving means so as to stop causing the driving means that has the larger pressure to move forward, until the difference falls within the predetermined tolerance. The inventions that comprise the above components cause the upper and lower Squeezing means to move forward to a match-plate by upper and lower driving means, to t&ereby squeeze the molding sand in the upper and lower molding spaces. During S ¥riod, the" difference between-the upper and lower squeezing pressures is SStetmlned based on the result of a measurement by their tgp"eT and'lower measuring means and is compared with a predetermined tolerance. If the difference is larger 2 than the predetermined tolerance, a command-transmitting means will send a command to the driving means so as to stop causing the driving means that has the larger pressure to move forward until the difference falls within the predetermined tolerance. In this invention, each of the upper and lower driving means is a hydraulic cylinder with a hydraulic power unit or an electric cylinder with a power supply unit. If the driving means are hydraulic cylinders, then each of the upper and lower squeezing pressure-measuring means is a pressure sensor installed on the hydraulic power unit that measures the oil pressure, or a load cell that measures the force of the hydraulic cylinder. If they are electric cylinders with a power supply unit, then each of the measuring means is a voltmeter installed on the power supply unit that measures its voltage, or a load cell that measures the force of the electric cylinder. An ammeter may be used instead of the voltmeter. The apparatus for making upper and lower molds is one that makes tight-flask upper and lower molds, or one that make flaskless upper and lower molds. As is clear from the above explanation, the method of claim 1 comprises the steps of holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby defining upper and lower molding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the match-plate for squeezing the molding sand in the upper and lower molding spaces, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance. Therefore, since the upper and lower squeezing means can be moved forward to the match-plate under the conditions that the upper and lower squeezing pressures are balanced, i.e., their difference i>eing kept within a predetermined tolerance, the resulting mold can be prevented from being warped, or the match-plate can be prevented from being broken. fBrief Descriptions of the Drawings] Fig.l is a schematic diagram of an apparatus for making the upper and lower 3 molds of the present invention. [Description of a Preferred Embodiment] Now, we discuss one embodiment of an apparatus for making upper and lower molds, referring to Fig. 1. As in Fig. 1, the apparatus comprises a match-plate 1, cope and drag flasks 2 and 3, upper and lower squeezing means 4 and 5, hydraulic cylinders 7 and -8 with a hydraulic power unit 6, upper and lower pressure sensors 9 and 10, and a command-transmitting means 11. The hydraulic cylinders 7 and 8 have functions as upper and lower driving means that cause the respective upper and lower squeezing means 4 and 5 to move forward to, and backward from, the match-plate 1. The upper and lower pressure sensors 9 and 10 are installed on the hydraulic power unit 6 and have functions as upper and lower squeezing pressure-measuring means that measure the respective pressures when the sand is squeezed. The command-transmitting means 11 determines the difference between the values measured by the upper and lower pressure sensors 9 and 10 and compares it to a predetermined tolerance. If the difference is larger than a predetermined tolerance, the means 11 will send a command to the hydraulic power unit 6 so as to stop causing whichever of the hydraulic cylinder 7 or 8 that has the larger pressure to move forward until the difference falls within the predetermined tolerance. Also, the hydraulic power unit 6 has two change-over valves 13 and 14. Each valve switches an oil supply to the respective port of the hydraulic cylinders 7 and 8, which oil is supplied from an oil pump 12. The apparatus that comprises the above components holds the match-plate 1 between the cope and drag flasks 2 and 3. Then, the apparatus inserts the upper and lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks 2 mad 3, which openings are opposite to the match-plate 1, so as to define upper and lower molding spaces. Next, it supplies molding sand to the upper and lower molding spaces. Then, it causes the upper and lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze the molding sand and make upper and lower Eftolcts. While the molding sand in the upper and lower molding spaces is being squeezed, the upper and lower pressure sensors 9 and 10 measure the pressures of the 4 hydraulic cylinders 7 and 8, and send the measured values to the command-transmitting means 11. Then the command-transmitting means 11 determines the difference between the pressures of the hydraulic cylinders 7 and 8. If the difference is larger than the predetermined tolerance, the means 11 will send a command to the change-over valve 13 or 14 of the hydraulic power unit 6 and change the valve position so as to stop causing whichever of the cylinder 7 or 8 that has the larger pressure to move forward until the difference falls within the tolerance. After that while the molding sand in the upper or lower molding space is being squeezed, the pressure of the oil in the hydraulic cylinder 7 or 8 that has the smaller pressure is increased. When the difference of their pressures in the cylinders 7 and 8 becomes within the predetermined tolerance, the position of the change-over valve 13 or 14 will be changed, and whichever of the cylinder 7 or 8 that has the larger pressure will be restarted, to be moved forward. By repeating these operations and maintaining the difference between the upper and lower squeezing pressures within the predetermined tolerance, the molding sand in the upper and lower molding spaces is squeezed, and thus the squeezing will be completed. 5 What is claimed is: 1. A method for making upper and lower molds comprises the steps of holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby defining upper and lower molding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the match-plate for squeezing the molding sand in the upper and lower molding spaces, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance. 2. An apparatus for making upper and lower molds is an apparatus for holding a match-plate between cope and drag flasks, inserting upper and lower squeezing means into the respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby defining upper and lower molding spaces, then supplying molding sand to the upper and lower molding spaces, and causing the upper and lower squeezing means to move forward to the match-plate for squeezing the molding sand in the upper and lower molding spaces, comprising upper and lower driving means that cause the respective upper and lower squeezing means to move forward to and backward from the match-plate, upper and lower squeezing pressure-measuring means that are installed on the upper and lower driving means and that measure the respective pressures when the sand is squeezed, and a command transmitting means that determines the difference between the values measured by the upper and lower squeezing pressure-measuring means and compares it to a predetermined tolerance, and if the difference is larger than the tolerance, the command-transmitting means will send a command to the driving means so as to stop causing the driving means that has the larger pressure to move forward until the difference falls within the predetermined tolerance. 3. The apparatus for making the upper and lower molds of claim 2, wherein the upper and lower driving means are hydraulic cylinders with a hplraulic power unit, and the upper and lower squeezing pressure-measuring means are pressure sensors that are installed on the hydraulic power Unit. 6 4. The apparatus for making the upper and lower molds of claim 3, wherein the pressure sensors are load cells that measure the force of the hydraulic cylinders. 5. The apparatus for making the upper and lower molds of claim 2, wherein the upper and lower driving means are electric cylinders with a power supply unit, and the upper and lower squeezing pressure-measuring means are voltmeters that are installed on the power supply unit. 6. The apparatus for making the upper and lower molds of claim 5, wherein the upper and lower squeezing pressure-measuring means are load cells that measure the force of the electric cylinders. 7. The apparatus for making the upper and lower molds of claim 2, wherein the upper and lower driving means are electric cylinders with a power supply unit, and the upper and lower squeezing pressure-measuring means are ammeters that are installed on the power supply unit. 8. The apparatus for making the upper and lower molds of claim 7, wherein the upper and lower squeezing pressure-measuring means are load cells that measure the force of the electric cylinders. 7 The purpose of this invention is to provide a method for making upper and lower molds and an apparatus therefor that can prevent the resulting molds from being warped and match-plates from being broken. The method of this invention comprises the step of holding a match-plate 1 between cope and drag flasks 2 and 3, inserting upper and lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks 2 and 3, which openings are opposite to the match-plate 1, so as to define upper and lower molding spaces, supplying molding sand to the upper and lower molding spaces, and then causing the upper and lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze the molding sand and make upper and lower molds, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance.

Full Text

[Technical field]
The present invention relates to a method for making upper and lower molds
arid an apparatus therefor.
[Background of the Invention]
Some methods for making upper and lower molds are publicly known. One of
them comprises the steps of holding a match-plate between cope and drag flasks,
inserting upper and lower squeezing means into the respective openings of the cope and
dragilasks, which openings are opposite to the match-plate, thereby defining upper and
lower jaaolding spaces, then supplying molding sand to the upper and lower molding
spaces, and causing the upper and lower squeezing means to move forward to the
mateh*£lsfte 1br squeezing the molding sand in the upper and lower molding spaces so as
to make flaskless upper and lower molds ;(see International Publication No.
WO2005/05825A1).
[Disclosure of the Invention]
However, the conventional method for making upper and lower molds that
comprises the above steps may cause differences between the pressures that are applied
to the upper and lower squeezing means when the squeezing means are caused to move
forward to the match-plate, because of the differences of the forward speeds or
pressures of upper and lower squeezing means, because of the difference of patterns of
both sides of a match-plate, because of the difference of the thicknesses of the upper'and
lower molds, because of the difference of the densities of molding sand being filled in
upper and lower molding spaces, etc. Therefore, the upper and lower squeezing
pressures given by the driving means, which pressures cause the upper and lower
squeezing means to mo ye forward, may become different, and-if so, one of the pressures
will become very strong. Accordingly, the method- has problems such that the resulting
mold may-be warped, or, at worst, the match-plate may be broken.
This invention' was created to resolve these drawbacks. Its'purpose is' to.
provide a method for making upper and lower molds and an apparatus therefor that can
prevent the resulting mold from being warped and the match-plate from being broken.
1

To this end, the method for making the upper and lower molds of claim 1
comprises'the steps of holding a match-plate between cope and drag flasks, inserting
upper and lower squeezing means into the respective openings of the cope and drag
flasks, which openings are opposite to the match-plate, thereby'defining upper and
lower molding spaces, then supplying molding sand to the upper and lower molding
spaces, and causing the upper and lower squeezing means to move forward to the
match-plate for squeezing the molding sand in the upper and lower molding spaces,
wherein during the step of causing the upper and lower squeezing means to move
forward to the match-plate, the difference between the squeezing pressures of the upper
and lower molding spaces is kept within a predetermined tolerance.
Also, the apparatus for making the upper and lower molds of claim 2 is one for
holding a match-plate between cope and drag flasks, inserting upper and lower
squeezing means into the respective openings of the cope and drag flasks, which
openings are opposite to the match-plate, thereby-defining upper and lower molding
spaces, then supplying molding sand to the upper and lower molding spaces, and
causing the upper and lower squeezing means to move forward to the match-plate for
squeezing the molding sand in the upper and lower molding spaces. The apparatus
comprises upper and lower driving means that cause the respective upper and lower
squeezing means to move forward to, and backward from, the match-plate, upper and
lower squeezing pressure-measuring means that are installed on the upper and lower
driving means and that measure the respective pressures when the sand is squeezed,
and a command-transmitting means that determines the difference between the values
measured by the upper and lower squeezing pressure-measuring means and compares
it to a- predetermined tolerance. If the difference is larger than the tolerance, the
command-transmitting means will send a command to the driving means so as to stop
causing the driving means that has the larger pressure to move forward, until the
difference falls within the predetermined tolerance.
The inventions that comprise the above components cause the upper and lower
Squeezing means to move forward to a match-plate by upper and lower driving means,
to t&ereby squeeze the molding sand in the upper and lower molding spaces. During
S ¥riod, the" difference between-the upper and lower squeezing pressures is
SStetmlned based on the result of a measurement by their t*gp"eT and'lower measuring
means and is compared with a predetermined tolerance. If the difference is larger
2

than the predetermined tolerance, a command-transmitting means will send a
command to the driving means so as to stop causing the driving means that has the
larger pressure to move forward until the difference falls within the predetermined
tolerance.
In this invention, each of the upper and lower driving means is a hydraulic
cylinder with a hydraulic power unit or an electric cylinder with a power supply unit.
If the driving means are hydraulic cylinders, then each of the upper and lower
squeezing pressure-measuring means is a pressure sensor installed on the hydraulic
power unit that measures the oil pressure, or a load cell that measures the force of the
hydraulic cylinder. If they are electric cylinders with a power supply unit, then each of
the measuring means is a voltmeter installed on the power supply unit that measures
its voltage, or a load cell that measures the force of the electric cylinder. An ammeter
may be used instead of the voltmeter.
The apparatus for making upper and lower molds is one that makes tight-flask
upper and lower molds, or one that make flaskless upper and lower molds.
As is clear from the above explanation, the method of claim 1 comprises the
steps of holding a match-plate between cope and drag flasks, inserting upper and lower
squeezing means into the respective openings of the cope and drag flasks, which
openings are opposite to the match-plate, thereby defining upper and lower molding
spaces, then supplying molding sand to the upper and lower molding spaces, and
causing the upper and lower squeezing means to move forward to the match-plate for
squeezing the molding sand in the upper and lower molding spaces, wherein during the
step of causing the upper and lower squeezing means to move forward to the
match-plate the difference between the squeezing pressures of the upper and lower
molding spaces is kept within a predetermined tolerance. Therefore, since the upper
and lower squeezing means can be moved forward to the match-plate under the
conditions that the upper and lower squeezing pressures are balanced, i.e., their
difference i>eing kept within a predetermined tolerance, the resulting mold can be
prevented from being warped, or the match-plate can be prevented from being broken.
fBrief Descriptions of the Drawings]
Fig.l is a schematic diagram of an apparatus for making the upper and lower
3

molds of the present invention.
[Description of a Preferred Embodiment]
Now, we discuss one embodiment of an apparatus for making upper and lower
molds, referring to Fig. 1. As in Fig. 1, the apparatus comprises a match-plate 1, cope
and drag flasks 2 and 3, upper and lower squeezing means 4 and 5, hydraulic cylinders
7 and -8 with a hydraulic power unit 6, upper and lower pressure sensors 9 and 10, and a
command-transmitting means 11. The hydraulic cylinders 7 and 8 have functions as
upper and lower driving means that cause the respective upper and lower squeezing
means 4 and 5 to move forward to, and backward from, the match-plate 1. The upper
and lower pressure sensors 9 and 10 are installed on the hydraulic power unit 6 and
have functions as upper and lower squeezing pressure-measuring means that measure
the respective pressures when the sand is squeezed. The command-transmitting
means 11 determines the difference between the values measured by the upper and
lower pressure sensors 9 and 10 and compares it to a predetermined tolerance. If the
difference is larger than a predetermined tolerance, the means 11 will send a command
to the hydraulic power unit 6 so as to stop causing whichever of the hydraulic cylinder 7
or 8 that has the larger pressure to move forward until the difference falls within the
predetermined tolerance.
Also, the hydraulic power unit 6 has two change-over valves 13 and 14. Each
valve switches an oil supply to the respective port of the hydraulic cylinders 7 and 8,
which oil is supplied from an oil pump 12.
The apparatus that comprises the above components holds the match-plate 1
between the cope and drag flasks 2 and 3. Then, the apparatus inserts the upper and
lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks
2 mad 3, which openings are opposite to the match-plate 1, so as to define upper and
lower molding spaces. Next, it supplies molding sand to the upper and lower molding
spaces. Then, it causes the upper and lower squeezing means 4 and 5 to move forward
to the match-plate 1 so as to squeeze the molding sand and make upper and lower
Eftolcts.
While the molding sand in the upper and lower molding spaces is being
squeezed, the upper and lower pressure sensors 9 and 10 measure the pressures of the
4

hydraulic cylinders 7 and 8, and send the measured values to the
command-transmitting means 11. Then the command-transmitting means 11
determines the difference between the pressures of the hydraulic cylinders 7 and 8. If
the difference is larger than the predetermined tolerance, the means 11 will send a
command to the change-over valve 13 or 14 of the hydraulic power unit 6 and change
the valve position so as to stop causing whichever of the cylinder 7 or 8 that has the
larger pressure to move forward until the difference falls within the tolerance. After
that while the molding sand in the upper or lower molding space is being squeezed, the
pressure of the oil in the hydraulic cylinder 7 or 8 that has the smaller pressure is
increased. When the difference of their pressures in the cylinders 7 and 8 becomes
within the predetermined tolerance, the position of the change-over valve 13 or 14 will
be changed, and whichever of the cylinder 7 or 8 that has the larger pressure will be
restarted, to be moved forward. By repeating these operations and maintaining the
difference between the upper and lower squeezing pressures within the predetermined
tolerance, the molding sand in the upper and lower molding spaces is squeezed, and
thus the squeezing will be completed.
5

What is claimed is:
1. A method for making upper and lower molds comprises the steps of holding a
match-plate between cope and drag flasks, inserting upper and lower squeezing means
into the respective openings of the cope and drag flasks, which openings are opposite to
the match-plate, thereby defining upper and lower molding spaces, then supplying
molding sand to the upper and lower molding spaces, and causing the upper and lower
squeezing means to move forward to the match-plate for squeezing the molding sand in
the upper and lower molding spaces,
wherein during the step of causing the upper and lower squeezing means to
move forward to the match-plate the difference between the squeezing pressures of the
upper and lower molding spaces is kept within a predetermined tolerance.
2. An apparatus for making upper and lower molds is an apparatus for holding a
match-plate between cope and drag flasks, inserting upper and lower squeezing means
into the respective openings of the cope and drag flasks, which openings are opposite to
the match-plate, thereby defining upper and lower molding spaces, then supplying
molding sand to the upper and lower molding spaces, and causing the upper and lower
squeezing means to move forward to the match-plate for squeezing the molding sand in
the upper and lower molding spaces, comprising
upper and lower driving means that cause the respective upper and lower
squeezing means to move forward to and backward from the match-plate,
upper and lower squeezing pressure-measuring means that are installed on the
upper and lower driving means and that measure the respective pressures when the
sand is squeezed, and
a command transmitting means that determines the difference between the
values measured by the upper and lower squeezing pressure-measuring means and
compares it to a predetermined tolerance, and if the difference is larger than the
tolerance, the command-transmitting means will send a command to the driving means
so as to stop causing the driving means that has the larger pressure to move forward
until the difference falls within the predetermined tolerance.
3. The apparatus for making the upper and lower molds of claim 2,
wherein the upper and lower driving means are hydraulic cylinders with a
hplraulic power unit, and the upper and lower squeezing pressure-measuring means
are pressure sensors that are installed on the hydraulic power Unit.
6

4. The apparatus for making the upper and lower molds of claim 3,
wherein the pressure sensors are load cells that measure the force of the
hydraulic cylinders.
5. The apparatus for making the upper and lower molds of claim 2,
wherein the upper and lower driving means are electric cylinders with a power
supply unit, and the upper and lower squeezing pressure-measuring means are
voltmeters that are installed on the power supply unit.
6. The apparatus for making the upper and lower molds of claim 5,
wherein the upper and lower squeezing pressure-measuring means are load
cells that measure the force of the electric cylinders.
7. The apparatus for making the upper and lower molds of claim 2,
wherein the upper and lower driving means are electric cylinders with a power
supply unit, and the upper and lower squeezing pressure-measuring means are
ammeters that are installed on the power supply unit.
8. The apparatus for making the upper and lower molds of claim 7,
wherein the upper and lower squeezing pressure-measuring means are load
cells that measure the force of the electric cylinders.
7

The purpose of this invention is to provide a method for making upper and
lower molds and an apparatus therefor that can prevent the resulting molds from being
warped and match-plates from being broken.
The method of this invention comprises the step of holding a match-plate 1
between cope and drag flasks 2 and 3, inserting upper and lower squeezing means 4 and
5 into the respective openings of the cope and drag flasks 2 and 3, which openings are
opposite to the match-plate 1, so as to define upper and lower molding spaces, supplying
molding sand to the upper and lower molding spaces, and then causing the upper and
lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze
the molding sand and make upper and lower molds, wherein during the step of causing
the upper and lower squeezing means to move forward to the match-plate the difference
between the squeezing pressures of the upper and lower molding spaces is kept within a
predetermined tolerance.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=VLzJi4ZphHVZwJmlJhO+OQ==&loc=wDBSZCsAt7zoiVrqcFJsRw==

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Patent Number

279952

Indian Patent Application Number

409/KOLNP/2008

PG Journal Number

06/2017

Publication Date

10-Feb-2017

Grant Date

06-Feb-2017

Date of Filing

29-Jan-2008

Name of Patentee

SINTOKOGIO, LTD.

Applicant Address

28-12, MEIEKI 3-CHOME, NAKAMURA-KU NAGOYA-SHI, AICHI-KEN

Inventors:

#	Inventor's Name	Inventor's Address
1	HIRATA MINORU	C/O SINTOKOGIO, LTD., TOYOKAWA SEISAKUSHO, 1, HONOHARA 3-CHOME, TOYOKAWA-SHI, AICHI-KEN 442-0061
2	SEKI TSUTOMU	C/O SINTOKOGIO, LTD., TOYOKAWA SEISAKUSHO, 1, HONOHARA 3-CHOME, TOYOKAWA-SHI, AICHI-KEN 442-0061
3	HADANO YUTAKA	C/O SINTOKOGIO, LTD., TOYOKAWA SEISAKUSHO, 1, HONOHARA 3-CHOME, TOYOKAWA-SHI, AICHI-KEN 442-0061

PCT International Classification Number

B22C 19/04

PCT International Application Number

PCT/JP2006/315654

PCT International Filing date

2006-08-08

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	2005-231783	2005-08-10	Japan