Automatic cold extrusion equipment for machining double-end spline shaft

Abstract

The utility model discloses automatic cold extrusion equipment for machining a double-end spline shaft. The automatic cold extrusion equipment mainly comprises a machine body, a feeding mechanism, a discharging mechanism, a pipe expanding clamping die, a gear extruding clamping die, a first pipe expanding mechanism, a second pipe expanding mechanism, a first gear extruding mechanism, a second gear extruding mechanism and a piece moving mechanism. By the adoption of the automatic cold extrusion equipment for machining the double-end spline shaft, a blank pipe can be reliably fixed through the pipe expanding clamping die and the gear extruding clamping die, the deflection problem is avoided, the machining precision is guaranteed, and due to the fact that the mode of pipe expanding and extruding at the two ends at the same time is adopted, the production takt is reduced by 50%, and the production efficiency is improved. The coaxiality and the straightness of the splines at the two ends of the shaft are improved, and meanwhile, the extrusion force is reduced, so that the tooth shape is fuller and more stable; and moreover, the part moving mechanism adopts a three-position synchronous part moving mode, so that the pipe expanding procedure and the gear extruding procedure can be carried out at the same time, the risk of machining consistency caused by part moving is greatly reduced, and the machining precision of splines at the two ends of the shaft is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to spline shaft processing technical field, concretely relates to a kind of automatic cold extrusion equipment of processing double-end spline shaft. BACKGROUND

[0002] Spline shaft is mainly used to transmit mechanical torque and ensure the precise alignment and synchronous movement of rotating parts, and is widely used in various mechanical structures.For electric power steering system, its male shaft is double-end spline shaft, that is, spline is processed on both ends of the male shaft.Usually, the spline on both ends of the male shaft of electric power steering system not only has different cross-sectional parameters (that is, different parameters such as spline tooth number, tooth height and outer diameter), but also has different axial lengths.

[0003] Therefore, the existing double-end spline shaft cold extrusion equipment generally adopts the design of the scheme disclosed in Chinese Utility Model Patent Application No.CN109226306A, which first expands or shrinks the tube at one end of the blank, then extrudes the teeth at that end, then expands or shrinks the tube at the other end of the blank, and finally extrudes the teeth at that end.Although it ensures the forming quality of the spline on both ends of the male shaft, the production rhythm is very long, the coaxiality and straightness of the spline on both ends of the shaft are not ideal, and the number of moving parts is large, which increases the risk of machining consistency of the spline on both ends of the shaft. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides an automatic cold extrusion equipment for processing double-end spline shaft.

[0005] The technical scheme is as follows:

[0006] The first aspect of the present application relates to an automatic cold extrusion equipment for processing double-end spline shaft, which comprises a machine body provided with a processing chamber, and an upper feeding mechanism and a lower feeding mechanism respectively arranged on the front and rear sides of the processing chamber, characterized in that the processing chamber is provided with:

[0007] An expanding tube clamping die and a tooth extruding clamping die are sequentially arranged between the upper feeding mechanism and the lower feeding mechanism;

[0008] A first expanding tube mechanism and a second expanding tube mechanism are synchronously arranged on the left and right sides of the expanding tube clamping die;

[0009] A first tooth extruding mechanism and a second tooth extruding mechanism are synchronously arranged on the left and right sides of the tooth extruding clamping die;

[0010] A moving part mechanism is used to synchronously transfer the workpiece on the upper feeding mechanism, the expanding tube clamping die and the tooth extruding clamping die to the expanding tube clamping die, the tooth extruding clamping die and the lower feeding mechanism.

[0011] The automatic cold extrusion equipment for processing double-end spline shafts can reliably fix the blank tube in the tube expanding process and the tooth extruding process through the special tube expanding clamping die and tooth extruding clamping die, prevents the blank tube from appearing deflection due to the first tube expanding mechanism and the second tube expanding mechanism or the first tube expanding mechanism and the second tube expanding mechanism at both ends due to the difference in acting force and processing length, ensures the processing precision, and reduces the extrusion force while reducing the production rhythm by 50% and improving the coaxiality and straightness of the splines at both ends of the shaft, so that the tooth profile is more full and stable. In addition, the moving mechanism adopts a three-position synchronous moving mode, which not only enables the tube expanding process and the tooth extruding process to be performed simultaneously, but also greatly reduces the risk of processing consistency caused by moving, thereby improving the processing precision of the splines at both ends of the shaft.

[0012] In some embodiments, the tube expanding clamping die includes a tube expanding lower clamping die fixedly installed at the bottom of the processing chamber and a tube expanding upper clamping die installed in a lifting manner at the top of the processing chamber, the upper end surface of the tube expanding lower clamping die is recessed to form a first shaft positioning groove, and the tube expanding upper clamping die is located directly above the tube expanding lower clamping die and can be pressed against or away from the upper end surface of the tube expanding lower clamping die under the drive of a first lifting driving device.

[0013] The tooth extruding clamping die includes a tooth extruding lower clamping die fixedly installed at the bottom of the processing chamber and a tooth extruding upper clamping die installed in a lifting manner at the top of the processing chamber, the upper end surface of the tooth extruding lower clamping die is recessed to form a second shaft positioning groove, and the tooth extruding upper clamping die is located directly above the tooth extruding lower clamping die and can be pressed against or away from the upper end surface of the tooth extruding lower clamping die under the drive of a second lifting driving device.

[0014] In some embodiments, the first tube expanding mechanism includes a first tube expanding carriage fixedly installed in an extending manner along the left-right direction at the bottom of the processing chamber, a first tube expanding die support fixedly installed on the sliding block of the first tube expanding carriage, and a first tube expanding die fixedly installed in an extending manner along the left-right direction on the first tube expanding die support, one end of the first tube expanding die away from the tube expanding lower clamping die is connected with a first tube expanding translational driving device, so that the first tube expanding die can approach or move away from the tube expanding lower clamping die under the drive of the first tube expanding translational driving device, one end of the first tube expanding die close to the tube expanding lower clamping die is provided with a first tube expanding mandrel coaxial with the first shaft positioning groove and a first tube expanding sizing cylinder coaxially arranged outside the first tube expanding mandrel, and the outer circumferential surface of the first tube expanding mandrel and the inner circumferential surface of the first tube expanding sizing cylinder jointly form a first tube expanding sizing cavity.

[0015] The second pipe expanding mechanism comprises a second pipe expanding slide frame fixedly installed on the bottom of the machining bin in the left-right direction, a second pipe expanding die support fixedly installed on the slide block of the second pipe expanding slide frame, and a second pipe expanding die fixedly installed on the second pipe expanding die support in the left-right direction, one end of the second pipe expanding die away from the pipe expanding lower die is connected with the second pipe expanding translation driving device, so that the second pipe expanding die can be driven by the second pipe expanding translation driving device to approach or move away from the pipe expanding lower die, one end of the second pipe expanding die close to the pipe expanding lower die is provided with a second pipe expanding mandrel coaxial with the first shaft positioning groove and a second pipe expanding sizing cylinder coaxially arranged outside the second pipe expanding mandrel, the outer periphery of the second pipe expanding mandrel and the inner periphery of the second pipe expanding sizing cylinder jointly form a second pipe expanding sizing cavity.

[0016] In some embodiments, the first tooth extruding mechanism comprises a first tooth extruding slide frame fixedly installed on the bottom of the machining bin in the left-right direction, a first tooth extruding die support fixedly installed on the slide block of the first tooth extruding slide frame, and a first tooth extruding die fixedly installed on the first tooth extruding die support in the left-right direction, one end of the first tooth extruding die away from the tooth extruding lower die is connected with the first tooth extruding translation driving device, so that the first tooth extruding die can be driven by the first tooth extruding translation driving device to approach or move away from the tooth extruding lower die, one end of the first tooth extruding die close to the tooth extruding lower die is provided with a first tooth extruding mandrel coaxial with the second shaft positioning groove and a first tooth extruding forming cylinder coaxially arranged outside the first tooth extruding mandrel, the outer periphery of the first tooth extruding mandrel and the inner periphery of the first tooth extruding forming cylinder jointly form a first tooth extruding forming cavity.

[0017] The second tooth extruding mechanism comprises a second tooth extruding slide frame fixedly installed on the bottom of the machining bin in the left-right direction, a second tooth extruding die support fixedly installed on the slide block of the second tooth extruding slide frame, and a second tooth extruding die fixedly installed on the second tooth extruding die support in the left-right direction, one end of the second tooth extruding die away from the tooth extruding lower die is connected with the second tooth extruding translation driving device, so that the second tooth extruding die can be driven by the second tooth extruding translation driving device to approach or move away from the tooth extruding lower die, one end of the second tooth extruding die close to the tooth extruding lower die is provided with a second tooth extruding mandrel coaxial with the second shaft positioning groove and a second tooth extruding forming cylinder coaxially arranged outside the second tooth extruding mandrel, the outer periphery of the second tooth extruding mandrel and the inner periphery of the second tooth extruding forming cylinder jointly form a second tooth extruding forming cavity.

[0018] In some embodiments, the first pipe expanding sizing cylinder, the second pipe expanding sizing cylinder, the first tooth extruding forming cylinder and the second tooth extruding forming cylinder are all provided with a high-pressure air pipe joint respectively communicating with the first pipe expanding sizing cavity, the second pipe expanding sizing cavity, the first tooth extruding forming cavity and the second tooth extruding forming cavity, and the high-pressure air pipe joint is communicated with the compressed air outlet of the air compressor through a high-pressure air pipe.

[0019] In some embodiments, the outer end of the first pipe expanding mandrel protrudes from the outer end of the first pipe expanding sizing drum, the outer end of the second pipe expanding mandrel protrudes from the outer end of the second pipe expanding sizing drum, the outer end of the first tooth extruding mandrel protrudes from the outer end of the first tooth extruding sizing drum, and the outer end of the second tooth extruding mandrel protrudes from the outer end of the second tooth extruding sizing drum.

[0020] In some embodiments, the moving mechanism comprises a moving slide frame fixedly installed on the bottom of the processing cabin in the front-rear direction, a lifting cylinder support fixedly installed on the sliding block of the moving slide frame, three lifting slide table cylinders vertically installed on the lifting cylinder support, finger cylinder installation plates vertically fixedly installed on the slide tables of the three lifting slide table cylinders respectively, and finger cylinders fixedly installed on the finger cylinder installation plates respectively, each of the finger cylinders is provided with two finger joints on which clamping jaws capable of cooperating with each other are installed, the three finger cylinders are uniformly distributed in the front-rear direction, the feeding mechanism, the pipe expanding clamping mold, the tooth extruding clamping mold and the discharging mechanism are uniformly distributed in the front-rear direction, and the center distance between any two adjacent finger cylinders is equal to the center distance between the pipe expanding clamping mold and the tooth extruding clamping mold.

[0021] In some embodiments, the feeding mechanism comprises a feeding heightening support fixedly installed on the machine body and a positioning cylinder support fixedly installed on the bottom plate of the moving slide frame, the top of the positioning cylinder support is fixedly installed with a shaft fixed support and a movable support sliding rail, the movable support sliding rail extends in the left-right direction, the shaft fixed support is arranged at one end of the movable support sliding rail close to the positioning cylinder support, a shaft movable support synchronously moving with the movable support sliding rail is fixedly installed on the sliding block of the movable support sliding rail, the shaft movable support is provided with a movable support positioning groove and a shaft positioning stopper blocking one end of the movable support positioning groove away from the shaft fixed support, the shaft fixed support is provided with a fixed support positioning groove coaxial with the movable support positioning groove, and a positioning cylinder is fixedly installed on the positioning cylinder support, the piston rod of the positioning cylinder extends in the direction close to the shaft fixed support in the left-right direction, and a positioning push block opposite to the fixed support positioning groove is installed on the outer end of the piston rod of the positioning cylinder, the positioning push block can approach or move away from the fixed support positioning groove under the driving of the piston rod of the positioning cylinder.

[0022] The top of the positioning cylinder support is fixedly installed with a strip-shaped lock seat parallel to the movable support sliding rail, the top of the strip-shaped lock seat is provided with positioning lock holes distributed in the left-right direction, one side of the shaft movable support close to the strip-shaped lock seat is provided with a lock pin installation seat located above the strip-shaped lock seat, a lock pin capable of ascending and descending along the lock pin installation seat is installed on the lock pin installation seat, and the lock pin can be embedded in any positioning lock hole.

[0023] In some embodiments, the unloading mechanism includes a loading and raising bracket fixedly mounted on the machine body. At least two shaft supports distributed in the left-right direction are fixedly mounted on the top of the loading and raising bracket, and each shaft support is coaxially provided with a shaft positioning groove.

[0024] In some embodiments, the feeding mechanism, the tube expanding clamping mold, the tooth extrusion clamping mold, and the unloading mechanism are all equipped with sensors for detecting whether the workpiece is placed in the correct position. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an automated cold extrusion equipment for processing double-headed spline shafts from one perspective.

[0026] Figure 2 This is a structural schematic diagram of an automated cold extrusion equipment for processing double-headed spline shafts from another perspective;

[0027] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0028] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0029] Figure 5 This is a partial sectional view of the second expansion mechanism. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0031] like Figures 1-5 As shown, an automated cold extrusion equipment for processing double-headed spline shafts mainly includes a machine body 1, a feeding mechanism 2, a discharging mechanism 3, a tube expansion clamping mold 5, an extrusion tooth clamping mold 6, a first tube expansion mechanism 7, a second tube expansion mechanism 8, a first extrusion tooth mechanism 9, a second extrusion tooth mechanism 10, and a part transfer mechanism 11.

[0032] The machine body 1 is provided with a front and rear open machining bin 1a, the feeding mechanism 2 and the discharging mechanism 3 are arranged outside the machining bin 1a, and specifically, the feeding mechanism 2 and the discharging mechanism 3 are respectively arranged on the front and rear sides of the machining bin 1a. The pipe expanding clamping die 5, the tooth extruding clamping die 6, the first pipe expanding mechanism 7, the second pipe expanding mechanism 8, the first tooth extruding mechanism 9, the second tooth extruding mechanism 10 and the moving mechanism 11 are arranged in the machining bin 1a. The pipe expanding clamping die 5 and the tooth extruding clamping die 6 are sequentially arranged between the feeding mechanism 2 and the discharging mechanism 3, that is, the feeding mechanism 2, the pipe expanding clamping die 5, the tooth extruding clamping die 6 and the discharging mechanism 3 are linearly distributed in the front and rear directions. The first pipe expanding mechanism 7 and the second pipe expanding mechanism 8 are synchronously arranged on the left and right sides of the pipe expanding clamping die 5 and can synchronously approach or synchronously move away, so that the two ends of the blank pipe can be synchronously expanded, and the positions of the two ends of the blank pipe which need to be formed with splines are expanded in diameter. The first tooth extruding mechanism 9 and the second tooth extruding mechanism 10 are synchronously arranged on the left and right sides of the tooth extruding clamping die 6 and can synchronously approach or synchronously move away, so that the two ends of the blank pipe can be synchronously extruded, and the two ends of the blank pipe are synchronously formed with splines. The moving mechanism 11 is used for synchronously transferring the workpieces on the feeding mechanism 2, the pipe expanding clamping die 5 and the tooth extruding clamping die 6 to the pipe expanding clamping die 5, the tooth extruding clamping die 6 and the discharging mechanism 3 respectively.

[0033] Therefore, by means of the special pipe expanding clamping die 5 and the tooth extruding clamping die 6, the blank pipe can be reliably fixed in the pipe expanding process and the tooth extruding process, the problem that the blank pipe is deflected due to the difference in the acting force and the machining length between the first pipe expanding mechanism 7 and the second pipe expanding mechanism 8 or between the first tooth extruding mechanism 9 and the second tooth extruding mechanism 10 is prevented, the machining precision is ensured, and since the two ends of the blank pipe are expanded and extruded at the same time, the production rhythm is reduced by 50%, the coaxiality and straightness of the splines on the two ends of the shaft are improved, and the extruding force is reduced, so that the tooth profile is more full and stable. Moreover, the moving mechanism 11 adopts the mode of synchronously moving workpieces in three positions, so that the pipe expanding process and the tooth extruding process can be simultaneously performed, the risk of machining consistency caused by moving workpieces is greatly reduced, and the machining precision of the splines on the two ends of the shaft is improved.

[0034] Please refer to Figure 3 The pipe expanding clamping die 5 comprises a pipe expanding lower clamping die 5a fixedly arranged on the bottom of the machining bin 1a and a pipe expanding upper clamping die 5b arranged on the top of the machining bin 1a and capable of being lifted and lowered, the upper end surface of the pipe expanding lower clamping die 5a is recessed to form a first shaft positioning groove 5a1, and the pipe expanding upper clamping die 5b is located directly above the pipe expanding lower clamping die 5a and can be pressed against or moved away from the upper end surface of the pipe expanding lower clamping die 5a under the drive of the first lifting and lowering driving device.

[0035] Further, the lower end surface of the pipe expanding upper clamp die 5b is recessed to form a first upper die positioning groove 5b1 that is adapted to the first shaft positioning groove 5a1, when the pipe expanding upper clamp die 5b is pressed down to tightly press the pipe expanding lower clamp die 5a, i.e. when the upper end surface of the pipe expanding lower clamp die 5a abuts against the lower end surface of the pipe expanding upper clamp die 5b, the first shaft positioning groove 5a1 and the first upper die positioning groove 5b1 together form a cylindrical structure, so that the blank pipe can be reliably clamped. Further, in order to improve the reliability of clamping, the first lifting driving device is preferably a hydraulic driving device.

[0036] Referring to Figure 4 , the gear extruding clamp die 6 includes a gear extruding lower clamp die 6a that is fixedly installed at the bottom of the machining bin 1a and a gear extruding upper clamp die 6b that is installed at the top of the machining bin 1a in a lifting manner, the upper end surface of the gear extruding lower clamp die 6a is recessed to form a second shaft positioning groove 6a1, the gear extruding upper clamp die 6b is located directly above the gear extruding lower clamp die 6a and can be pressed against or away from the upper end surface of the gear extruding lower clamp die 6a under the driving of the second lifting driving device.

[0037] Further, the lower end surface of the gear extruding upper clamp die 6b is recessed to form a second upper die positioning groove 6b1 that is adapted to the second shaft positioning groove 6a1, when the gear extruding upper clamp die 6b is pressed down to tightly press the gear extruding lower clamp die 6a, i.e. when the upper end surface of the gear extruding lower clamp die 6a abuts against the lower end surface of the gear extruding upper clamp die 6b, the second shaft positioning groove 6a1 and the second upper die positioning groove 6b1 together form a cylindrical structure, so that the blank pipe can be reliably clamped. Further, in order to improve the reliability of clamping, the second lifting driving device is preferably a hydraulic driving device.

[0038] Referring to Figures 1-4 , the first pipe expanding mechanism 7 includes a first pipe expanding carriage 7a that is fixedly installed at the bottom of the machining bin 1a in a left-right direction, a first pipe expanding die support 7b that is fixedly installed on the sliding block of the first pipe expanding carriage 7a, and a first pipe expanding die 7c that is fixedly installed on the first pipe expanding die support 7b in a left-right direction, one end of the first pipe expanding die 7c away from the pipe expanding lower clamp die 5a is connected with the first pipe expanding translation driving device, so that it can be driven by the first pipe expanding translation driving device to approach or move away from the pipe expanding lower clamp die 5a, one end of the first pipe expanding die 7c close to the pipe expanding lower clamp die 5a is installed with a first pipe expanding mandrel 7d coaxial with the first shaft positioning groove 5a1 and a first pipe expanding sizing cylinder 7e arranged coaxially outside the first pipe expanding mandrel 7d, the outer peripheral surface of the first pipe expanding mandrel 7d and the inner peripheral surface of the first pipe expanding sizing cylinder 7e together form a first pipe expanding sizing cavity.

[0039] The second pipe expanding mechanism 8 comprises a second pipe expanding slide 8a fixedly installed on the bottom of the machining bin 1a and extending in the left-right direction, a second pipe expanding die support 8b fixedly installed on the slide block of the second pipe expanding slide 8a, and a second pipe expanding die 8c fixedly installed on the second pipe expanding die support 8b and extending in the left-right direction, wherein the end of the second pipe expanding die 8c away from the pipe expanding lower clamp die 5a is connected with the second pipe expanding translation driving device, so that the second pipe expanding die 8c can be driven by the second pipe expanding translation driving device to approach or move away from the pipe expanding lower clamp die 5a, and the end of the second pipe expanding die 8c close to the pipe expanding lower clamp die 5a is provided with a second pipe expanding mandrel 8d coaxial with the first shaft positioning groove 5a1 and a second pipe expanding sizing cylinder 8e coaxially arranged outside the second pipe expanding mandrel 8d, and the outer circumferential surface of the second pipe expanding mandrel 8d and the inner circumferential surface of the second pipe expanding sizing cylinder 8e jointly form a second pipe expanding sizing cavity.

[0040] Therefore, when the first pipe expanding die 7c and the second pipe expanding die 8c are controlled to approach each other synchronously by the first pipe expanding translation driving device and the second pipe expanding translation driving device, the two ends of the blank pipe clamped by the pipe expanding clamp die 5 can be pressed into the first pipe expanding sizing cavity and the second pipe expanding sizing cavity respectively, so that the two ends of the blank pipe are expanded.

[0041] Similarly, the first tooth extruding mechanism 9 comprises a first tooth extruding slide 9a fixedly installed on the bottom of the machining bin 1a and extending in the left-right direction, a first tooth extruding die support 9b fixedly installed on the slide block of the first tooth extruding slide 9a, and a first tooth extruding die 9c fixedly installed on the first tooth extruding die support 9b and extending in the left-right direction, wherein the end of the first tooth extruding die 9c away from the tooth extruding lower clamp die 6a is connected with the first tooth extruding translation driving device, so that the first tooth extruding die 9c can be driven by the first tooth extruding translation driving device to approach or move away from the tooth extruding lower clamp die 6a, and the end of the first tooth extruding die 9c close to the tooth extruding lower clamp die 6a is provided with a first tooth extruding mandrel 9d coaxial with the second shaft positioning groove 6a1 and a first tooth extruding forming cylinder 9e coaxially arranged outside the first tooth extruding mandrel 9d, and the outer circumferential surface of the first tooth extruding mandrel 9d and the inner circumferential surface of the first tooth extruding forming cylinder 9e jointly form a first tooth extruding forming cavity.

[0042] The second extrusion gear mechanism 10 comprises a second extrusion gear slide 10a fixedly installed on the bottom of the machining bin 1a and extending in the left-right direction, a second extrusion gear die support 10b fixedly installed on the slide of the second extrusion gear slide 10a, and a second extrusion gear die 10c fixedly installed on the second extrusion gear die support 10b and extending in the left-right direction, wherein the end of the second extrusion gear die 10c away from the extrusion gear lower clamp die 6a is connected with the second extrusion gear translation driving device, so that the second extrusion gear die 10c can be driven by the second extrusion gear translation driving device to approach or move away from the extrusion gear lower clamp die 6a, and the end of the second extrusion gear die 10c approaching the extrusion gear lower clamp die 6a is provided with a second extrusion gear mandrel 10d coaxial with the second shaft positioning groove 6a1 and a second extrusion gear forming cylinder 10e coaxially arranged outside the second extrusion gear mandrel 10d, and the outer circumferential surface of the second extrusion gear mandrel 10d and the inner circumferential surface of the second extrusion gear forming cylinder 10e jointly form a second extrusion gear forming cavity.

[0043] Therefore, when the first extrusion gear die 9c and the second extrusion gear die 10c are controlled to approach each other synchronously by the first extrusion gear translation driving device and the second extrusion gear translation driving device, the two ends of the blank pipe clamped by the extrusion gear clamp die 6 can be pressed into the first extrusion gear forming cavity and the second extrusion gear forming cavity respectively, so that the extrusion gear is formed at the pipe expansion positions of the two ends of the blank pipe, and the spline is formed at the same time.

[0044] Since the splines at the two ends of the shaft not only have different cross-sectional parameters (i.e., different parameters such as spline tooth number, tooth height, and outer diameter), but also have different axial lengths, the first pipe expansion translation driving device, the second pipe expansion translation driving device, the first extrusion gear translation driving device, and the second extrusion gear translation driving device are preferably driven by a servo motor driving hydraulic assembly, specifically, the design of the hydraulic cylinder is optimized, the hydraulic cylinder is composed of a main cylinder and a quick cylinder, which not only can realize the conversion of fast feeding speed and working feeding speed, but also can realize fast pushing on the idle stroke, and the response is fast, when working, the speed is reduced and the extrusion force is increased, and the speed is adjustable, by adjusting the servo motor speed and adapting different sizes of pump groups, different length splines can be realized, and the extrusion starts and ends at the same time, so that the quality and size stability of the product are ensured. Moreover, the quick cylinder is arranged inside the main cylinder, so that the volume of the hydraulic cylinder is reduced, and the arrangement is easy.

[0045] Please refer to Figure 5, the first pipe expanding sizing cylinder 7e, the second pipe expanding sizing cylinder 8e, the first tooth extruding forming cylinder 9e and the second tooth extruding forming cylinder 10e are all provided with high-pressure gas pipe joints 12 which are communicated with the first pipe expanding sizing cavity, the second pipe expanding sizing cavity, the first tooth extruding forming cavity and the second tooth extruding forming cavity respectively, and the high-pressure gas pipe joints 12 are communicated with the compressed air outlet of the air compressor through high-pressure gas pipes 13. By adding the structure of blowing high-pressure gas in the first pipe expanding sizing cavity, the second pipe expanding sizing cavity, the first tooth extruding forming cavity and the second tooth extruding forming cavity, the iron filings, objects and saponified substances generated in the extrusion process can be discharged through the flow of high-pressure gas, the inside of the first pipe expanding sizing cavity, the second pipe expanding sizing cavity, the first tooth extruding forming cavity and the second tooth extruding forming cavity is kept clean, thereby improving the precision of pipe expanding and tooth extruding, avoiding the problem of poor product forming caused by foreign matter accumulation, and at the same time, the traditional process of manual cleaning during shutdown is cancelled, thereby improving the production efficiency.

[0046] Please refer to Figure 3 and Figure 4 , the outer end of the first pipe expanding mandrel 7d protrudes from the outer end of the first pipe expanding sizing cylinder 7e, the outer end of the second pipe expanding mandrel 8d protrudes from the outer end of the second pipe expanding sizing cylinder 8e, the outer end of the first tooth extruding mandrel 9d protrudes from the outer end of the first tooth extruding forming cylinder 9e, and the outer end of the second tooth extruding mandrel 10d protrudes from the outer end of the second tooth extruding forming cylinder 10e. Through such a design, the positioning precision of the blank pipe is improved, thereby improving the machining precision. Further, the outer end of the first pipe expanding mandrel 7d, the second pipe expanding mandrel 8d, the first tooth extruding mandrel 9d and the second tooth extruding mandrel 10d are all chamfered, thereby being more easily embedded in the blank pipe and avoiding damage to the blank pipe.

[0047] Please refer to Figures 1-3 , the moving piece mechanism 11 includes a moving piece carriage 11a fixedly installed at the bottom of the machining bin 1a and extending in the front-rear direction, a lifting cylinder support 11b fixedly installed on the sliding block of the moving piece carriage 11a, three lifting sliding table cylinders 11c vertically installed on the lifting cylinder support 11b, finger cylinder installation plates 11d vertically fixedly installed on the sliding tables of the respective lifting sliding table cylinders 11c, and finger cylinders 11e fixedly installed on the respective finger cylinder installation plates 11d, two clamping jaws 11f capable of cooperating with each other are installed on the two finger joints of each finger cylinder 11e, the three finger cylinders 11e are uniformly distributed in the front-rear direction, the feeding mechanism 2, the pipe expanding clamping die 5, the tooth extruding clamping die 6 and the discharging mechanism 3 are uniformly distributed in the front-rear direction, and the center distance between any two adjacent finger cylinders 11e is equal to the center distance between the pipe expanding clamping die 5 and the tooth extruding clamping die 6.

[0048] Through the above structure, the moving mechanism 11 not only realizes the synchronous moving of three positions, but also has high control precision, can stably and reliably clamp the blank pipe, avoids the displacement of the blank pipe in the clamping process, and ensures the machining precision.

[0049] Please see Figure 3 The feeding mechanism 2 includes a feeding heightening support 2a fixedly installed on the machine body 1 and a positioning cylinder support 2b fixedly installed on the bottom plate of the moving slide 11a, the top of the positioning cylinder support 2b is fixedly installed with a shaft fixed support 2c and a movable support sliding rail 2d extending in the left-right direction, the shaft fixed support 2c is arranged at one end of the movable support sliding rail 2d close to the positioning cylinder support 2b, a shaft movable support 2e synchronously moving with the movable support sliding rail 2d is fixedly installed on the sliding block of the movable support sliding rail 2d, the shaft movable support 2e is provided with a movable support positioning groove 2e1 and a shaft positioning stopper 2e2 blocking one end of the movable support positioning groove 2e1 away from the shaft fixed support 2c, the shaft fixed support 2c is provided with a fixed support positioning groove 2c1 coaxial with the movable support positioning groove 2e1, and the positioning cylinder support 2b is fixedly installed with a positioning cylinder 2f, the piston rod of the positioning cylinder 2f extends in the direction close to the shaft fixed support 2c in the left-right direction, and the outer end of the piston rod of the positioning cylinder 2f is installed with a positioning push block 2g opposite to the fixed support positioning groove 2c1, the positioning push block 2g can be close to or away from the fixed support positioning groove 2c1 under the driving of the piston rod of the positioning cylinder 2f. Through the cooperation of the positioning push block 2g and the positioning stopper 2e2, the blank pipe can be clamped from both ends, so as to realize the accurate axial positioning of the blank pipe, and then realize the accurate positioning of the whole machining process in cooperation with the moving mechanism 11, thereby improving the machining precision.

[0050] Further, the top of the positioning cylinder support 2b is fixedly installed with a strip-shaped lock seat 2h parallel to the movable support sliding rail 2d, the top of the strip-shaped lock seat 2h is provided with positioning lock holes 2h1 distributed in the left-right direction, one side of the shaft movable support 2e close to the strip-shaped lock seat 2h is provided with a lock pin mounting seat 2e3 located above the strip-shaped lock seat 2h, the lock pin mounting seat 2e3 is installed with a lock pin 2i capable of ascending and descending along the lock pin mounting seat 2e3, and the lock pin 2i can be embedded in any positioning lock hole 2h1, so as to accurately position the blank pipes of different lengths according to different machining requirements, thereby improving the versatility of the equipment. In addition, the fixed support positioning groove 2c1 and the movable support positioning groove 2e1 are both arc structures with the upper part open, so as to adapt to blank pipes of different diameters, and have good versatility.

[0051] Please see Figure 4The blanking mechanism 3 comprises an upper blanking support 3a fixedly installed on the machine body 1, and at least two shaft supports 3b distributed along the left-right direction are fixedly installed on the top of the upper blanking support 3a, and an axial positioning groove 3b1 is coaxially arranged on each shaft support 3b, which is simple and reliable, and the axial positioning groove 3b1 is also an arc-shaped structure with an upper opening, so as to adapt to blank pipes with different diameters and have good versatility.

[0052] Please refer to Figures 1-4 The upper blanking mechanism 2, the pipe expanding and clamping die 5, the tooth extruding and clamping die 6 and the blanking mechanism 3 are all provided with sensors 14 for detecting whether the workpiece is placed in place, so as to realize automatic processing in cooperation.

[0053] The working principle of the automatic cold extrusion equipment for processing double-end spline shafts is as follows:

[0054] When the sensor 14 beside the upper blanking mechanism 2 detects that the blank pipe on the upper blanking mechanism 2 is placed in place, the moving mechanism 11 is started to transfer the blank pipe on the upper blanking mechanism 2 to the pipe expanding and clamping die 5;

[0055] When the sensor 14 beside the pipe expanding and clamping die 5 detects that the blank pipe on the pipe expanding and clamping die 5 is placed in place, the pipe expanding and clamping die 5 clamps the blank pipe, and then the first pipe expanding mechanism 7 and the second pipe expanding mechanism 8 are synchronously close to the pipe expanding and clamping die 5, so that the two ends of the blank pipe are expanded in diameter, and after completion, the moving mechanism 11 is started to transfer the blank pipe on the pipe expanding and clamping die 5 to the tooth extruding and clamping die 6;

[0056] When the sensor 14 beside the tooth extruding and clamping die 6 detects that the blank pipe on the tooth extruding and clamping die 6 is placed in place, the tooth extruding and clamping die 6 clamps the blank pipe, and then the first tooth extruding mechanism 9 and the second tooth extruding mechanism 10 are synchronously close to the tooth extruding and clamping die 6, so that the spline is machined on the two ends of the blank pipe, and after completion, the moving mechanism 11 is started to transfer the blank pipe on the tooth extruding and clamping die 6 to the blanking mechanism 3.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without deviating from the purpose and claims of the present application, and such changes fall within the protection scope of the present application.

Claims

1. An automatic cold extrusion device for processing double-end spline shafts, comprising a machine body provided with a processing bin, and feeding and discharging mechanisms respectively arranged on the front and rear sides of the processing bin, characterized in that, The processing bin is provided with: The pipe expanding clamping die and the extrusion tooth clamping die are arranged between the feeding mechanism and the discharging mechanism in sequence; The first pipe expanding mechanism and the second pipe expanding mechanism are arranged on the left and right sides of the pipe expanding clamping die and can be synchronously approached or synchronously distanced; The first extrusion tooth mechanism and the second extrusion tooth mechanism are arranged on the left and right sides of the extrusion tooth clamping die and can be synchronously approached or synchronously distanced; The piece moving mechanism is used for synchronously transferring the pieces on the feeding mechanism, the pipe expanding clamping die and the extrusion tooth clamping die to the pipe expanding clamping die, the extrusion tooth clamping die and the discharging mechanism respectively.

2. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 1, characterized by The pipe expanding clamping die comprises a pipe expanding lower clamping die fixedly installed on the bottom of the processing bin and a pipe expanding upper clamping die installed on the top of the processing bin and capable of being lifted and lowered, the upper end surface of the pipe expanding lower clamping die is recessed to form a first shaft positioning groove, the pipe expanding upper clamping die is located directly above the pipe expanding lower clamping die and can be pressed against or distanced from the upper end surface of the pipe expanding lower clamping die under the driving of a first lifting driving device; The extrusion tooth clamping die comprises an extrusion tooth lower clamping die fixedly installed on the bottom of the processing bin and an extrusion tooth upper clamping die installed on the top of the processing bin and capable of being lifted and lowered, the upper end surface of the extrusion tooth lower clamping die is recessed to form a second shaft positioning groove, the extrusion tooth upper clamping die is located directly above the extrusion tooth lower clamping die and can be pressed against or distanced from the upper end surface of the extrusion tooth lower clamping die under the driving of a second lifting driving device.

3. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 2, characterized by The first pipe expanding mechanism comprises a first pipe expanding carriage fixedly installed on the bottom of the processing bin and extending along the left and right directions, a first pipe expanding die support fixedly installed on the sliding block of the first pipe expanding carriage and a first pipe expanding die fixedly installed on the first pipe expanding die support and extending along the left and right directions, one end of the first pipe expanding die distanced from the pipe expanding lower clamping die is connected with a first pipe expanding translation driving device so as to be capable of approaching or distancing from the pipe expanding lower clamping die under the driving of the first pipe expanding translation driving device, one end of the first pipe expanding die approaching the pipe expanding lower clamping die is provided with a first pipe expanding mandrel coaxial with the first shaft positioning groove and a first pipe expanding shaping cylinder coaxially arranged outside the first pipe expanding mandrel, the outer circumferential surface of the first pipe expanding mandrel and the inner circumferential surface of the first pipe expanding shaping cylinder jointly form a first pipe expanding shaping cavity. The second pipe expanding mechanism comprises a second pipe expanding carriage fixedly installed on the bottom of the processing bin and extending along the left and right directions, a second pipe expanding die support fixedly installed on the sliding block of the second pipe expanding carriage and a second pipe expanding die fixedly installed on the second pipe expanding die support and extending along the left and right directions, one end of the second pipe expanding die distanced from the pipe expanding lower clamping die is connected with a second pipe expanding translation driving device so as to be capable of approaching or distancing from the pipe expanding lower clamping die under the driving of the second pipe expanding translation driving device, one end of the second pipe expanding die approaching the pipe expanding lower clamping die is provided with a second pipe expanding mandrel coaxial with the first shaft positioning groove and a second pipe expanding shaping cylinder coaxially arranged outside the second pipe expanding mandrel, the outer circumferential surface of the second pipe expanding mandrel and the inner circumferential surface of the second pipe expanding shaping cylinder jointly form a second pipe expanding shaping cavity.

4. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 3, characterized by The first extrusion gear mechanism comprises a first extrusion gear slide frame fixedly installed on the bottom of the machining bin in the left-right direction, a first extrusion gear mold support fixedly installed on the slide block of the first extrusion gear slide frame, and a first extrusion gear mold fixedly installed on the first extrusion gear mold support in the left-right direction, wherein the first extrusion gear mold is connected to the first extrusion gear translation driving device at one end away from the extrusion gear lower clamp mold, so as to be driven by the first extrusion gear translation driving device to approach or move away from the extrusion gear lower clamp mold, and the first extrusion gear mold is provided with a first extrusion gear mandrel coaxial with the second shaft positioning groove at one end close to the extrusion gear lower clamp mold, and a first extrusion gear forming cylinder coaxially arranged outside the first extrusion gear mandrel, wherein the outer periphery of the first extrusion gear mandrel and the inner periphery of the first extrusion gear forming cylinder jointly form a first extrusion gear forming cavity. The second extrusion gear mechanism comprises a second extrusion gear slide frame fixedly installed on the bottom of the machining bin in the left-right direction, a second extrusion gear mold support fixedly installed on the slide block of the second extrusion gear slide frame, and a second extrusion gear mold fixedly installed on the second extrusion gear mold support in the left-right direction, wherein the second extrusion gear mold is connected to the second extrusion gear translation driving device at one end away from the extrusion gear lower clamp mold, so as to be driven by the second extrusion gear translation driving device to approach or move away from the extrusion gear lower clamp mold, and the second extrusion gear mold is provided with a second extrusion gear mandrel coaxial with the second shaft positioning groove at one end close to the extrusion gear lower clamp mold, and a second extrusion gear forming cylinder coaxially arranged outside the second extrusion gear mandrel, wherein the outer periphery of the second extrusion gear mandrel and the inner periphery of the second extrusion gear forming cylinder jointly form a second extrusion gear forming cavity.

5. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 4, wherein The first pipe expanding mandrel, the second pipe expanding mandrel, the first extrusion gear mandrel and the second extrusion gear mandrel are all provided with high-pressure air pipe joints respectively communicating with the first pipe expanding forming cavity, the second pipe expanding forming cavity, the first extrusion gear forming cavity and the second extrusion gear forming cavity, and the high-pressure air pipe joints are communicated with the compressed air outlet of the air compressor through high-pressure air pipes.

6. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 4, wherein The outer end of the first pipe expanding mandrel protrudes from the outer end of the first pipe expanding forming cylinder, the outer end of the second pipe expanding mandrel protrudes from the outer end of the second pipe expanding forming cylinder, the outer end of the first extrusion gear mandrel protrudes from the outer end of the first extrusion gear forming cylinder, and the outer end of the second extrusion gear mandrel protrudes from the outer end of the second extrusion gear forming cylinder.

7. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 1, wherein The moving mechanism comprises a moving slide frame fixedly installed on the bottom of the machining bin in the front-rear direction, a lifting cylinder support fixedly installed on the slide block of the moving slide frame, three lifting slide table cylinders vertically installed on the lifting cylinder support, finger cylinder mounting plates vertically fixedly installed on the slide tables of the three lifting slide table cylinders respectively, and finger cylinders fixedly installed on the finger cylinder mounting plates respectively, wherein each finger cylinder is provided with two finger joints each having a clamping jaw capable of cooperating with each other, the three finger cylinders are uniformly distributed in the front-rear direction, the feeding mechanism, the pipe expanding clamp mold, the extrusion gear clamp mold and the discharging mechanism are uniformly distributed in the front-rear direction, and the center distance between any two adjacent finger cylinders is equal to the center distance between the pipe expanding clamp mold and the extrusion gear clamp mold.

8. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 7, wherein The upper feeding mechanism comprises an upper feeding heightening support fixedly installed on the machine body and a positioning cylinder support fixedly installed on the bottom plate of the part moving slide, the top of the positioning cylinder support is fixedly installed with an axle fixed support and a movable support sliding rail, the movable support sliding rail extends towards left and right directions, the axle fixed support is arranged at one end of the movable support sliding rail close to the positioning cylinder support, a synchronous axle movable support is fixedly installed on the sliding block of the movable support sliding rail, the axle movable support is provided with a movable support positioning groove and an axle positioning block blocking one end of the movable support positioning groove away from the axle fixed support, the axle fixed support is provided with a fixed support positioning groove coaxial with the movable support positioning groove, the positioning cylinder support is fixedly installed with a positioning cylinder, the piston rod of the positioning cylinder extends towards the axle fixed support along the left and right directions, the outer end of the piston rod of the positioning cylinder is installed with a positioning push block opposite to the fixed support positioning groove, the positioning push block can be driven by the piston rod of the positioning cylinder to approach or move away from the fixed support positioning groove; The top of the positioning cylinder support is fixedly installed with a strip-shaped lock seat parallel to the movable support sliding rail, the top of the strip-shaped lock seat is provided with positioning lock holes distributed along the left and right directions, one side of the axle movable support close to the strip-shaped lock seat is provided with a lock pin mounting seat above the strip-shaped lock seat, the lock pin mounting seat is installed with a lock pin capable of ascending and descending along the lock pin mounting seat, the lock pin can be embedded into any positioning lock hole.

9. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 1, wherein The lower feeding mechanism comprises an upper feeding heightening support fixedly installed on the machine body, the top of the upper feeding heightening support is fixedly installed with at least two axle supports distributed along the left and right directions, the axle positioning groove is coaxially arranged on each axle support.

10. An automatic cold extrusion apparatus for machining a double-headed spline shaft according to claim 1, characterized by, The upper feeding mechanism, the pipe expanding and clamping die, the gear extruding and clamping die and the lower feeding mechanism are all installed with sensors for detecting whether the workpiece is placed in place.

Images