Title of Invention

BAR PULLING ARM

Abstract

The innovated bar pulling arm assembly is used for industrial mass production purpose. Necessity of new bar pulling arm innovation came because of continuous production to reduce the schedule time and to increase the productivity. Bar pulling arm can be used on all CNC turning center and auto lathes. Which has a hollow spindle to facilitate lengthy bars and auto clamping, unclamping facility. (chuck or collect). There is no need of a bar feed unit. When working with bar feed unit to control the length of the component a stopper is fixed in one of the station in the turret, instead of that stopper a bar pulling arm can be fixed and bar can be pulled to the required length by grooving or slit bush method which is convenient. The CNC center of small scale industries they don't have the existing costly bar feeding unit. The innovated bar pulling assembly is very cheap and very simple and it serves the same purpose of bar feeding unit for industrial mass production. The innovation bar pulling assembly is designed is such a way that it can directly mounted on the turret as a tool and fastened as a tool here no (separate motor) electrical power consumption and no risk of accident, where as in bar feeding unit there is a chances of accident. The space for bar feeding unit is more where as no more space required for the innovated one, with this we can pull the bar as required length in this method and no raw material wastage. Cycle time reduces also bar feed setup time reduced drastically. No operator risk easy program. To support length bar behind of the spindle a simple designed support is required.

Full Text

This invention relates to a bar pulling arm used in all CNC turning centers. This invention has for its object to provide a holder, for the said arm assembly, having a recess or pocket for the holding of a arm at one end. The said recess or pocket has parallel of the machine spindle face. A clamping element is provided on the holder to hold the pulling arm in place of said recess or pocket. This clamping element is provided with means to prevent displacement of the arm once it is placed in position in the holder. The bar pulling arm of this invention can be used on all types of CNC turning center, which having auto clamping and unclamping facility and other special purpose auto machines. The following are the different bar pulling method of this invention. 1. Grooving method 2. Slit bush method and 3. Magnetic method The arm may have a cross-section such as spanner shaped of rectangular with locating slots on the face, top and bottom sides for appropriate positioning of the same in the holder. The locking profile of the arm have the required profile for bar pulling. The locking profile is CC shape, and straight is provided by holding the bar in the arm. This invention is illustrated by way of example in the accompanying drawing in which: Fig. 1 shows a plan and elevation of holder Fig. 2 shows a plan and elevation of arm. Fig. 3 shows a side view and elevation of Slit bush. Fig. 4 shows a plan and elevation of Magnetic holder. Fig. 5 shows a sectional view AA, plan and elevation of Bar pulling arm assembly. EXPLANATION WITH REFERENCE TO THE FIGURES HOLDER: FIG. 1 1. Shown in Figure 1(a) as V is shank for mounting on the turret of CNC machine. 2. Shown in Figure 1(a) as cb5 is tapping hole for clamping with 3 bolts. 3. Shown in Figure 1(a) as 'c' is maintaining center height of holder and arm. 4. Shown in Figure 1(a) as cd' is Chamber provided at both sides of groove or pocket for easy alignment of arm. 5. Shown in Figure 1(a) as 'e' is pocket for fitting the arm of bar pulling assembly. ARM: FIG. 2 1. Shown in Figure 2(a) as 'a' is locking on the bar groove or slit bush groove. 2. Shown in Figure 2(a) as cb' is uncontact circle on the bar groove or slit bush groove. 3. Shown in Figure 2(a) as 'c' is smooth engaging radius on the bar groove or slit bush groove. 4. Shown in Figure 2(a) as 'd' is slightly expansion while on the bar groove or slit bush groove as well as avoid the load and breaking of arm which act as a spirng. 5. Shown in Figure 2(b) as 'e' is width of arm which is suitable width on bar groove or slit bush groove. 6. Shown in Figure 2(b) as T is strength for bar pulling. 7. Shown in Figure 2(b) as 'g' is sitting in the holder. 8. Shown in Figure 2(b) as 'h' is holes for arm clamping in holder by alien bolts. SLIT BUSH : FIG. 3 1. Shown in Figure 3(a) as 'a' is out side dia of slit bush. 2. Shown in Figure 3(a) as 'b' is radius for easy entering on the bar. 3. Shown in Figure 3(a) as cc' is Sharp edge for avoid slipage while bar pulling. 4. Shown in Figure 3(a) as 'd' is for arm sitting on the groove. 5. Shown in Figure 3(a) as 'e' is chamfer for easy entering the arm. 6. Shown in Figure 3(b) as T is slit for expansion, while sitting on the bar tightly. 7. Shown in Figure 3(b) as 'g' is radius at the edge, both sides for avoiding the mark on the bar while pushing the slit bush to the spindle direction. MAGNETIC HOLDER : Fig. 4 1. Shown in Figure 4(a) as 'a' is outside dia of magnetic holder, (non magnet) Magnet for pulling the bar. 2. Shown in Figure 4(b) as 'b' is a hole which is providing to the bar and magnet face to butt perfectly. This invention relates to a bar pulling arm in all CNC turning center. Bar pulling is a technique which is ever evolving into better and still better methods calling for specialized skill and precise technical knowledge. Previously bar feeder unit is required (electromechanical and hydraulic bar feeder is available) in that for bar feeding continuously motor is running so electrical power is consumed. Hydraulic oil required in case of hydraulic bar feed unit. Machining bar and bar feeder bar, both occupied more (space) length so gives more vibration, we can't give high rpm, So cycle time is more. While working change the insert or some small work by mistake open the collect or chuck bar will be comeout seriously accident occurs. Bar feeder unit occupied more area, stopper and bar feeder is different and cost is too high. Another novel method is to use bar pulling arm suitably located and clamped on the holder for a variety of methods. In this arrangement the cost of the bar pulling arm comparatively very less and after usage, only the bar suitable arm have to be replaced, whereas the arm and holder is not damaged or worn out as in the case mentioned above. The present invention has for the object to provide a Bar pulling arm assembly to be used on all CNC Turning Centers and other auto special purpose machines. The bar pulling arm is clamp on the turret like normal tools it is very simple 'C shape profile arm. An arm we can change easily for different size bar like parting blade, extra power is not required for pulling the bar. Necessity of new bar pulling arm innovation came because of continuous production to reduce the schedule time and to increase the productivity. Bar pulling arm can be used on all CNC turning centers and auto lathes which having auto clamping and unclamping facility, (chuck or collet) There is no need of a bar feed unit. When working with bar feed unit to control the length of the component a stopper is fixed in one of the station in the turret. Instead of that stopper a bar pulling arm can be fixed and bar can be pulled from the front and clamped the bar, which is to be machined as per drawing. For different size of rod, different arm has to be used. This can be easily changed like a parting blade and cycle time can be reduced. To pull the bar, groove is made at the end of bar and pull the bar to the required length, carryout all the operations as per dimension, then part off the component and made groove for next job pulling. Same steps is followed for Mass Production till the bar completion. Another object of the invention is to provide a Bar pulling assembly which can, easily be adapted to CNC turning centers and hold the bar firmly during the bar pulling of the CNC lathe or like machine to which the bar pulling arms may be fixed on turret. A still further object of the invention is to provide a simple and economical bar pulling assembly. With these and other objectives in view, this invention provides different bar pulling arm comprising of a pulling arm and a slit bush, the said arm holder having a shank, one end of which is to be fitted in a machine turret and the other end is provided for sitting on groove of bar, the said arm having identical profile at one end thereof depending upon the nature of the pulling for which it is required, the pulling portions of the arm having a locking on bar groove predetermined value, means provided at the said other end of the shank for holding the said arm and to be clamped by the said clamping device, the said means comprising a recess or pocket the base of which is perpendicular in a direction opposition to the machine axis, the said arm also being provided with recess on the face of holder being located in the recess or pocket on the arm holder, and to be held in position by the clamping device, and wherein the said clamping device is provided with means such as an extension, on the bar pulling arm holder. The bar pulling arm are 'C shaped and has a straight form on its bar groove at one end. The clamping device comprises of a pivotally mounted clamping element having a projection at one and to hold the bar resting on the said bar groove. The clamping device may also comprise a clamping element having a projection at one end thereof to be seated over the arm to hold the same lock on bar and pull the required length and come back normal position and an extension at the other end thereof, the said extension being disposed in a allot, recess, or the like on the tool holder. The clamping element is held on the tool holder by means, such as a screw. The axis of the arm may be perpendicular to the longitudinal axis of the tool holder. An embodiment of this invention is now illustrated by way of example in the drawings accompanying this specification. In the said drawings:-Fig. 1 (a) shows the plan of the holder Fig. 1 (b) shows the elevation of the holder. Fig. 2 (a) shows the plan of the arm. Fig. 2 (b) shows the elevation of the arm Fig. 3 (a) shows the plan of the slit bush Fig. 3 (b) shows the Right side view of slit bush shown in Fig. 3 (a). Fig. 4 (a) shows the plan of the Magnetic holder. Fig. 4 (b) shows the elevation of the Magnetic holder shown in Fig. 4 (a). Fig. 5 (a) shows plan of the pulling arm. Fig. 5 (b) shows the sectional A A of Bar pulling arm shows in Fig. 5 (a). Fig. 5 (c) shows a side view of Fig. 5 (b). DIFFERENT BAR PULLING METHODS (1) Grooving (2) Slit bush and (3) Magnet In these three methods, only two methods are more useful. They are grooving and slit bush. 1. GROOVING METHOD: This method can be used widely when the supplied bar outside diameter (OD) is rough and normally OD operation is common in all machining components. So we can make groove on 3D, for pulling the bar. Bar can be pull with help of bar pulling arm groove depth and width has to maintain as per arm size. When the Bar pulling arm is locked on the groove (X-axis) a lengthy job can be pulled easily. Required length is pulled and after the operations has been done again a groove is made (space has to be left for making groove) again required length is pulled and supported by tailstock and remaining operations can be carried out. Similarly making required number of grooves should pull any amount of length. Any material (ferrous or non ferrous) can be pull & there is no limit for pulling the bar length. 2. SLIT BUSH METHOD : When the supplied bar is smooth or polished, slit bush is used for pulling the bar to the required length to carry out the operation without any additional operation (Groove). With this method any amount of length can be pulled, instead of groove on the job there will be a groove on the slit bush. Slit bush is fixed on the bar tightly, the arm sit on the groove and pull the slit bush along with the bar to required length (when the chuck is unlocked), then the bar is clamped and arm pushes the slit bush back to its original position and carry out all the operation as per dimensions. The part off the component and same above steps followed for mass production till the bar completion. 3. MAGNETIC METHOD: By using magnetic method any dia and possible length of ferrous material bar can be pulled to the required length for machining component. In place of a stopper used in the turret a magnet has to be fixed and bar can be pulled. Like bar feed unit in this method, length of bar that can be pulled depends on maximum 'Z' axis length. It also depends on distance from rod face to maximum distance of turret can travel away from the rod face (limited Length). To machine a maximum dia rod a powerful magnet is enough. This is useful for all smaller dia rods. Length of a rod should be 1 meter or 2 meters which ever is convenient. Bars pulled in this method will not effect the magnetic properties of component because the face is machined. Magnet should be fixed in the turret opposite to the tools which remove chips, care has been taken to see that chips do not get struck to the Magnet. BAR PULLING PARTS AND EXPLANATION: Holder, Arm, and Slit Bush. HOLDER: It is common to both grooving as well as slit bush method. Holder is fixed in the turret like a tool, and the arm is fixed in the holder with help of bolts. The arm holder is fabricated in such a way that the arm is exactly in the center height of the M/c Spindle and & perpendicular to the Z.-axis. ARM: It is mainly used to pull the bar. Arm is fixed in the holder with the help of bolts. Different size arms are required for different dia bars. The ends of the CC clamp (half circle) arm is projected straightly. This arm after sitting in the groove in half circle is slightly projected. It will be holding the bar to machines center axis, then it pulls the bar to required length as per the program. The bar pulling arm is designed such a way that it pulls the bar and care has been taken to maintain center height of spindle axis. Which is the bars used in the bar feed unit, which can be pulled by arm. As collet varies for different dia of bars similarly arm also varies. SLIT BUSH: Slit bush outer dia (OD) has a groove for the arm to sit and there will be a slit on one side. Internal Dia (ID) of slit bush is less than the OD of the bar. This will help the slit bush to sit tightly on the bar. There is a radius on one side of the ID. This radius helps the slit bush to enter the rod and move on it easily Different dia rods different slit bush with arm is required. When seating the slit bush, internal radius side should be enter on the bar. Then it should be tapped slowly, so that the slit bush sits on the rod tightly. When the slit bush seats on the bar tightly then to pull the bar as required length along with pulling arm. To pull the bar or pushes slit bush, machine cutting force is enough. If bar size various machine size and capacity of cutting force also varies. Futures : Holder : (1) We can make sliding groove for arm and clamping from top side of bolts. (2) It can be made different size arm front and back side in the blade is fitted in holder. (3) Holder can be made 'V groove fitted the adjustable arm for different bar. Arm : (1) Adjustable arm can be make in small variation in bars. (2) "U" shape three point contact on bar or slit bush can be made. (3) Different size of arm on both ends of arm can be made in single piece. (4) We can make arm sliding in groove and externally clamping by bolts avoiding the side clamping bolts. (5) We can make mark for center height checking for future development. Slit Bush : (1) We can make angle internal dia in the slit bush in spindle direction for easy movement while pushing the slit bush in the direction of spindle and more rigid for pulling the bar. (2) We can make spanner (like circlips spanner) with locking pins, the pin guide in holes in the slit bush, the holes are near the slit both sides. For easy fitted on the bar and we can remove easily. (3) we can make more strength for pulling the bar, by providing bolts at slit position. Magnetic Block: (1) We can provide on and off switch, it helps to vary the magnetic power for pulling the different bars. (2) We can make round magnetic block holding back side of the round magnetic without shank instead of rectangle shape lengthy block provided. THE MAIN OBJECTIVE OF THE INVENTION : 1. Expensive bar feeding unit not required. 2. M/cs without bar feeding unit can also be used for mass production. 3. Floor area saved. 4. Hydraulic oil saved. 5. Electricity saved. 6. Bar feed setting time avoided. 7. High rpm can be used for machining. 8. Noise from bar feeder unit avoided & no noise pollution 9. Increase in productivity. 10. Bar feeding also becomes a part of CNC m/c resulting in closed loop system. 11. Accidents resulting from bar feeding unit are avoided. 12. Loads spindle bearing and bar feed stopper of turret are avoided. Note: 1) For lengthy bars support is to be provided on backside of spindle by designing a suitable support 2) For easy movement of bar use suitable silent bushes in the spindle. I Claim: A bar pulling arm assembly comprising a arm, slit bush, holder and Magnetic block, the said pulling arm having a shank, one end of which is adapted to be fitted in a machine turret and the arm is provided with bolts, the said bar pulling arm having identical profile at both sides thereof depending upon the dia of the bar to be pulled for which it is required, the pulling arm pre-determined value, means provided at the said other end of the shank for holding the said arm and to be clamped by the said clamping device, i.e. holder. The said arm comprising turret the base of which is perpendicular in a direction opposite to the machine axis, the said bar Pulling arm also being provided with recess on the face of the holder, and to be held in position by the clamping device, and wherein the said bar pulling arm is provided with means such as an extension, disposed on the bar pulling arm holder. A bar pulling arm assembly as claimed in claim 1, wherein the bar Pulling arm, slit bush and Magnetic block by using above tools we can pull ferrous and non ferrous bars to the required length. A bar pulling arm as claimed in claim 1, wherein the bar pulling arm comprises of a mounted on turret station and the other end is to be engaged to pull the bar as program. A bar pulling arm as claimed in claim 1, wherein the bar pulling arm comprises a clamping element having bolts at one end thereof to be seated over the turret station to hold the same in position, and an arm at the other end thereof, the said arm engaged in slit bush or groove and magnetic block is directly mounted on tool holder. A bar pulling assembly as claimed in any of the preceding claims 3 or 4, wherein the said arm is held on the turret station in holder by means such as Bolts. (Fastened the arm is holder by means of bolts). A bar pulling assembly as claimed in claim 5, wherein the said means for holding the arm with slit bush on the bar "c" clamping arm and slit bush ring shaped is designed in such a way that center height of machine spindle axis is mounted for perfect locking where as groove provided. A bar pulling arm as claimed in any of the proceeding claims, wherein the axis of the bar Pulling arm is perpendicular to the longitudinal axis of the tool holder. A bar pulling arm assembly as claimed in any of the preceding claims, wherein the axis of the clamping is parallel to the longitudinal axis of the bar pulling arm. A bar pulling arm assembly substantially as hereinbefore described and illustrated in the accompanying drawings.

Documents:

022-che-2004-abstract.pdf

022-che-2004-claims duplicate.pdf

022-che-2004-claims original.pdf

022-che-2004-correspondnece-others.pdf

022-che-2004-correspondnece-po.pdf

022-che-2004-description(complete) duplicate.pdf

022-che-2004-description(complete) original.pdf

022-che-2004-drawings.pdf

022-che-2004-form 1.pdf

022-che-2004-form 19.pdf