Cold heading equipment and process for a combined piston pin

Abstract

The present invention relates to the technical field of cold heading, and specifically relates to a cold heading device and process for a combined piston pin, including a frame, on which a cold heading hammer and a die are installed; a top-out assembly is arranged at the die; the cold heading device further includes a guide frame rotatably installed on the frame, a guide hole for guiding the piston pin is provided on the guide frame, and the guide frame further includes a clamping block, a clamping assembly and a rotation driving assembly; the clamping block is slidably installed on the guide frame, the clamping assembly includes a rotating shaft, rollers, a synchronous belt, a first mounting seat and a screw rod, the rotating shaft is rotatably installed on the guide frame, the first mounting seat is installed on the guide frame, the screw rod is rotatably installed on the first mounting seat, the screw rod is threadedly connected with the clamping block, and both ends of the synchronous belt are respectively sleeved on the rotating shaft and the screw rod. The present invention realizes the function of automatically clamping the workpiece, achieves the effect of improving the coaxiality of the inner hole of the piston pin while quickly machining the piston pin, and solves the problem that it is difficult to ensure the coaxiality of the inner hole of the piston pin with large taper angles at both ends.

Description

Technical Field

[0001] The present invention relates to the technical field of cold heading, and specifically relates to a cold heading device and process for a combined piston pin. Background Art

[0002] The piston pin is an important functional part in the engine piston connecting rod assembly. It connects the piston and the connecting rod and is used for force transmission between the piston and the connecting rod. With the development of the automotive industry, the whole vehicle, including the engine, has higher requirements for lightweighting. The lightweighting of the piston pin has become a common research topic for vehicle manufacturers and component suppliers. The combined piston pin has the advantages of small mass and reliable function. In recent years, its proportion in the application field has been gradually increasing. The cold heading forming process of the combined piston pin has become one of the key research topics in the cold heading industry. However, when the existing cold heading equipment processes workpieces, it is necessary to repeatedly clamp the equipment, resulting in poor processing efficiency.

[0003] For this reason, Chinese Patent CN218080251U discloses a high-precision automatic high-speed cold heading forming machine, which is equipped with a cutting device and a conveying turntable inside the equipment. There are several structural holes on the conveying turntable. The cutting device cuts the raw material into a suitable size, and then through the clamping device, the raw material is transported to the processing part of the device. Through this disc-type structure for conveying, the efficiency of the device during cold heading is further improved.

[0004] However, the two sides of the inner hole of the combined piston pin are large conical angles, and the purpose is to reduce the mass inertia of the piston connecting rod assembly during the high-speed operation of the engine. However, the shape of the large conical angles at both ends has certain technical requirements for the cold heading forming process. The remaining processes after cold heading of this type of piston pin are rough grinding the outer diameter - turning both end faces - heat treatment - finish grinding the outer diameter, and there is no machining on the inner hole. Therefore, the inner hole is completely ensured by cold heading, and its size, surface roughness, and coaxiality must be ensured during the cold heading process. Summary of the Invention

[0005] Aiming at the above problems, a cold heading device and process for a combined piston pin are provided, which solve the problem that it is difficult to ensure the coaxiality of the inner holes of the piston pins with large conical angles at both ends through clamping blocks, rotating shafts, rollers, the first synchronous belt, and the first screw.

[0006] To solve the problems of the existing technology, the technical solution adopted by the present invention is as follows:

[0007] A combined piston pin cold heading equipment comprises a frame, on which a cold heading hammer and a die are mounted; an ejection assembly is arranged at the die; the cold heading equipment also comprises a guide frame rotatably mounted on the frame, a guide hole for guiding the piston pin is opened on the guide frame, the guide frame also comprises a clamping block, a clamping assembly and a rotating drive assembly for driving the guide frame to rotate; the clamping block is slidably mounted on the guide frame, the clamping assembly comprises a rotating shaft, a roller, a synchronous belt, a first mounting seat and a screw, the rotating shaft is rotatably mounted on the guide frame, the first mounting seat is mounted on the guide frame, the screw is rotatably mounted on the first mounting seat, the screw is threadedly connected to the clamping block, the roller is sleeved on the rotating shaft, and the two ends of the synchronous belt are sleeved on the rotating shaft and the screw respectively.

[0008] Preferably, the cold heading equipment also includes a detection assembly, which includes a second mounting seat, a second synchronous belt, a second screw, a pressure sensor and a first elastic member; the second mounting seat is mounted on the guide rod; the two ends of the second synchronous belt are respectively sleeved on the rotating shaft and the second screw, the second screw is rotatably mounted on the second mounting seat, and the slider is slidably mounted on the second mounting seat; the second screw is threadedly connected to the slider; the pressure sensor is mounted on the second mounting seat, and the two ends of the first elastic member are respectively connected to the pressure sensor and the slider.

[0009] Preferably, the cold heading equipment also includes a positioning assembly, which includes a positioning plate, a mounting frame, a first linear drive and a clamping plate; the positioning plate is installed on the guide frame, and the mounting frame is installed on the frame; the first linear drive is installed on the mounting frame, and the clamping plate is connected to the driving end of the first linear drive.

[0010] Preferably, the cold heading equipment further comprises a clamping assembly, which comprises a pressure ring and a second elastic member, and the pressure ring is in driving connection with the driving end of the rotary drive assembly; a pressure plate is mounted on the pressure ring, and the pressure plate and the positioning plate are connected via the second elastic member. Preferably, the rotary drive assembly comprises a rotary drive, a rotary gear and a gear ring; the rotary drive is mounted on the frame, and the rotary gear is sleeved on the driving end of the rotary drive; the gear ring is coaxially connected to the pressure ring, and the rotary gear is in driving connection with the gear ring.

[0011] Preferably, a feeding assembly is provided on the frame, and the feeding assembly includes a feeding guide rail, which is in the shape of an elongated cylinder and whose axis is colinear with the axis of one of the guide holes.

[0012] Preferably, the guide frame also includes a material unloading guide rail, and the material unloading guide rail is installed on the frame.

[0013] Preferably, the ejection assembly includes a second linear drive, a push rod and a push block; the second linear drive is connected to the end of the mold away from the cold heading hammer; the driving end of the second linear drive is connected to the push rod; and the end of the push rod away from the second linear drive is connected to the push block.

[0014] Preferably, the machine frame is also provided with a support assembly, which includes a slide rail and a roller; the slide rail is installed on the machine frame, the roller is rotatably installed in the slide rail, and the guide frame is in rolling connection with the roller.

[0015] A cold heading process for a combined piston pin includes the following steps: S1, after the workpiece is sheared, it is installed into the guide hole on the guide frame; S2, the workpiece is pressed into the die by a cold heading hammer, and the workpieces in multiple dies are respectively subjected to sizing, stretching, punching, forming the lower taper angle, forming the upper taper angle, and finishing the inner diameter processes; S3, start the rotary drive assembly to drive the guide frame to rotate, then remove the processed workpiece, and store it in the warehouse after inspection.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. The present invention realizes the function of automatically clamping the workpiece through the clamping block, rotating shaft, roller, first synchronous belt, and first screw rod, achieving the effect of improving the coaxiality of the inner hole of the piston pin while quickly processing the piston pin, and solving the problem that it is difficult to ensure the coaxiality of the inner hole of the piston pin with large taper angles at both ends.

[0018] 2. The present invention realizes the function of sensing the clamping degree of the clamping block through the second mounting seat, second synchronous belt, second screw rod, pressure sensor, and first elastic member. Since the workpiece is related to the pushing stroke of the ejecting assembly when it is ejected, and once there is a situation such as slipping between the workpiece and the roller, the workpiece cannot be fixed on the guide frame. Therefore, a detection assembly is designed to sense the clamping degree of the clamping block.

[0019] 3. The present invention realizes the function of improving the accuracy of the rotation angle of the guide frame through the positioning plate, mounting frame, first linear driver, and clamping plate. Description of the Drawings

[0020] Figure 1 is a three-dimensional schematic diagram of a cold heading device for a combined piston pin;

[0021] Figure 2 is a three-dimensional schematic diagram of a cold heading hammer, die, ejecting assembly, clamping block, and clamping assembly in a cold heading device for a combined piston pin;

[0022] Figure 3 is a three-dimensional schematic diagram of the guide frame of a cold heading device for a combined piston pin;

[0023] Figure 4 is a front view of a clamping block, clamping assembly, and detection assembly in a cold heading device for a combined piston pin;

[0024] Figure 5 is a three-dimensional schematic diagram of the detection assembly in a cold heading device for a combined piston pin;

[0025] Figure 6 It is a three-dimensional schematic diagram of a positioning component in a cold heading device for a combined piston pin;

[0026] Figure 7 It is a three-dimensional schematic diagram of a rotation drive component and a pressing component in a cold heading device for a combined piston pin;

[0027] Figure 8 It is a three-dimensional schematic diagram of a blanking component in a cold heading device for a combined piston pin;

[0028] Figure 9 It is a three-dimensional schematic diagram of a loading component in a cold heading device for a combined piston pin;

[0029] Figure 10 It is a three-dimensional schematic diagram of an ejection component during the working process in a cold heading device for a combined piston pin.

[0030] The reference numerals in the figure are:

[0031] 1 - Frame;

[0032] 11 - Cold heading hammer;

[0033] 12 - Die;

[0034] 13 - Ejection component; 131 - Second linear driver; 132 - Ejector rod; 133 - Ejector block;

[0035] 14 - Support component; 141 - Slide rail; 142 - Roller;

[0036] 2 - Guide frame;

[0037] 21 - Clamping block;

[0038] 22 - Clamping component; 221 - Rotating shaft; 222 - Roller; 223 - First synchronous belt; 224 - First mounting seat; 225 - First screw;

[0039] 23 - Rotation drive component; 231 - Rotation driver; 232 - Rotation gear; 233 - Tooth ring;

[0040] 24 - Loading component; 241 - Loading guide rail; 242 - Reinforcing rib;

[0041] 25 - Blanking guide rail;

[0042] 3 - Detection component;

[0043] 31 - Second mounting seat; 311 - Slide block;

[0044] 32 - Second synchronous belt;

[0045] 33 - Second screw;

[0046] 34 - Pressure sensor;

[0047] 35 - First elastic member;

[0048] 4 - Positioning assembly;

[0049] 41 - Positioning plate;

[0050] 42 - Mounting bracket;

[0051] 43 - First linear drive;

[0052] 44 - Clamping plate;

[0053] 5 - Pressing assembly;

[0054] 51 - Pressing ring; 511 - Pressing plate;

[0055] 52 - Second elastic member;

[0056] 6 - Workpiece. Detailed implementation manners

[0057] To further understand the features, technical means, and the specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0058] Refer to Figures 1 - 4 : A cold heading device for a combined piston pin, including a frame 1, on which a cold heading hammer 11 and a die 12 are installed; a top - out assembly 13 is provided at the die 12; the cold heading device further includes a guide frame 2 rotatably installed on the frame 1, a guide hole for guiding the piston pin is provided on the guide frame 2, and the guide frame 2 further includes a clamping block 21, a clamping assembly 22, and a rotation drive assembly 23 for driving the guide frame 2 to rotate; the clamping block 21 is slidably installed on the guide frame 2, the clamping assembly 22 includes a rotating shaft 221, a roller 222, a synchronous belt, a first mounting seat 224, and a screw rod, the rotating shaft 221 is rotatably installed on the guide frame 2, the first mounting seat 224 is installed on the guide frame 2, the screw rod is rotatably installed on the first mounting seat 224, the screw rod is threadedly connected to the clamping block 21, the roller 222 is sleeved on the rotating shaft 221, and both ends of the synchronous belt are respectively sleeved on the rotating shaft 221 and the screw rod.

[0059] The axis of the guide frame 2 is horizontally arranged, there are eight guide holes on the guide frame 2, and the multiple guide holes are symmetrically distributed about the axis of the guide frame 2, and two clamping blocks 21 are provided at each guide hole.

[0060] The present invention realizes the function of automatically clamping the workpiece 6 through the clamping block 21, the rotating shaft 221, the roller 222, the first synchronous belt 223 and the first screw 225, achieving the effect of improving the coaxiality of the inner hole of the piston pin while quickly machining the piston pin, and solving the problem that it is difficult to ensure the coaxiality of the inner hole of the piston pin with large taper angles at both ends. The ejection assembly 13 and the rotation drive assembly 23 are electrically connected to the controller; the operator first installs the workpiece 6 into the guiding hole on the guiding frame 2, then starts the equipment, the cold heading hammer 11 pushes the workpiece 6 and passes through the guiding hole, presses the workpiece 6 into the die 12. After the machining is completed, the controller sends a signal to the ejection assembly 13, and the workpiece 6 is ejected from the die 12 through the ejection assembly 13 and pushed into the guiding hole. As the workpiece 6 slides along the guiding rod, it pushes the roller 222 to rotate. The roller 222 drives the screw to rotate through the synchronous belt. The rotation of the screw drives the clamping block 21 threaded thereon to slide, and thus the workpiece 6 is fixed by the relative movement of the two clamping blocks 21. And as the workpiece 6 is ejected, it will clamp the workpiece 6 tighter to prevent it from shaking during the movement. Then the controller sends a signal to the rotation drive assembly 23, and the rotation drive assembly 23 drives the guiding frame 2 to rotate by a certain angle. The guiding frame 2 drives the workpiece 6 to move synchronously, and then moves the workpiece 6 to the next die 12, and the workpiece 6 is machined by the cooperation of the cold heading hammer 11 and the die 12. As the cold heading hammer 11 drives the workpiece 6 to slide towards the die 12, the workpiece 6 will drive the roller 222 to rotate in the reverse direction, and thus the clamping block 21 automatically releases the workpiece 6. After the workpiece 6 rotates one week, the machining of the workpiece 6 is completed; the coaxiality of the workpiece 6 is ensured through the guiding hole on the guiding frame 2, preventing the workpiece 6 from being deflected during cold heading.

[0061] Refer to Figure 1 、 Figure 2 and Figure 5 : The cold heading equipment further includes a detection assembly 3. The detection assembly 3 includes a second mounting seat 31, a second synchronous belt 32, a second screw 33, a pressure sensor 34 and a first elastic member 35; the second mounting seat 31 is mounted on the guiding rod; both ends of the second synchronous belt 32 are respectively sleeved on the rotating shaft 221 and the second screw 33. The second screw 33 is rotatably mounted on the second mounting seat 31. The slider 311 is slidably mounted on the second mounting seat 31; the second screw 33 is threadedly connected to the slider 311; the pressure sensor 34 is mounted on the second mounting seat 31, and both ends of the first elastic member 35 are respectively connected to the pressure sensor 34 and the slider 311.

[0062] The present invention realizes the function of the clamping degree of the induction clamping block 21 through the second mounting seat 31, the second synchronous belt 32, the second screw rod 33, the pressure sensor 34 and the first elastic member 35. The pressure sensor 34 is electrically connected to the controller; since the workpiece 6 is related to the pushing stroke of the ejecting assembly 13 when it is ejected, and once there is a situation such as slipping between the workpiece 6 and the roller 222, the workpiece 6 cannot be fixed on the guide frame 2. Therefore, the detection assembly 3 is designed. When the ejecting assembly 13 ejects the workpiece 6, as the workpiece 6 contacts the roller 222, the roller 222 is driven to rotate, the roller 222 drives the rotating shaft 221 to rotate, and the rotating shaft 221 drives the first screw rod 225 and the second screw rod 33 to rotate through the first synchronous belt 223 and the second synchronous belt 32 respectively. The clamping block 21 threadedly connected to the first screw rod 225 is driven to move to clamp the workpiece 6, and at the same time, the slider 311 threadedly connected to the second screw rod 33 is driven to move. As the slider 311 moves, the first elastic member 35 contracts, the pressure sensor 34 senses the pressure change and feeds back a signal to the controller, and the controller detects the clamping condition of the workpiece 6 through the signal fed back by the pressure sensor 34.

[0063] Refer to Figure 1 and Figure 6 The cold heading device further includes a positioning assembly 4, and the positioning assembly 4 includes a positioning plate 41, a mounting frame 42, a first linear driver 43 and a clamping plate 44; the positioning plate 41 is mounted on the guide frame 2, and the mounting frame 42 is mounted on the machine frame 1; the first linear driver 43 is mounted on the mounting frame 42, and the clamping plate 44 is connected to the driving end of the first linear driver 43.

[0064] The present invention realizes the function of improving the accuracy of the rotation angle of the guide frame 2 through the positioning plate 41, the mounting frame 42, the first linear driver 43 and the clamping plate 44. The first linear driver 43 is preferably a linear cylinder, and the linear cylinder is electrically connected to the controller; before the controller sends a signal to start the rotation driving assembly 23, it first sends a signal to the first linear driver 43, the first linear driver 43 drives the clamping plate 44 to retract, and then sends a signal to the rotation driving assembly 23, the rotation driving assembly 23 drives the guide frame 2 to rotate slowly. Before the guide frame 2 rotates to the specified angle, the first linear driver 43 drives the clamping plate 44 to extend again, the guide frame 2 continues to rotate with the drive of the rotation driving assembly 23, and when it rotates to the specified angle, the clamping plate 44 just contacts the positioning plate 41 and stops moving under the restriction of the positioning plate 41, thereby improving the rotation accuracy of the guide frame 2 and ensuring the coaxiality of the workpiece 6 and the mold 12.

[0065] Refer to Figure 1 and Figure 7:The cold heading device further includes a pressing component 5. The pressing component 5 includes a pressing ring 51 and a second elastic member 52. The pressing ring 51 is drivingly connected to the driving end of the rotary driving component 23. A pressing plate 511 is installed on the pressing ring 51, and the pressing plate 511 and the positioning plate 41 are connected by the second elastic member 52. The present invention realizes the function of driving the guiding frame 2 to rotate through the pressing ring 51, the pressing plate 511 and the second elastic member 52. The operator first installs the workpiece 6 into the guiding hole, and then the controller first sends a signal to the first linear driver 43. The first linear driver 43 drives the clamping plate 44 to retract. After the clamping plate 44 retracts, the elastic force of the second elastic member 52 acts on the positioning plate 41, pushing the guiding frame 2 to rotate. The controller sends a signal to the rotary driving component 23, and the rotary driving component 23 drives the pressing ring 51 to rotate. At the same time, the first linear driver 43 drives the clamping plate 44 to extend again. The guiding frame 2 continuously rotates with the drive of the rotary driving component 23. When it rotates to a specified angle, the clamping plate 44 just contacts the positioning plate 41, and the second elastic member 52 contracts, applying pressure to the positioning plate 41 and pressing the positioning plate 41 against the clamping plate 44.

[0066] Refer to Figure 3 and Figure 7 : The rotary driving component 23 includes a rotary driver 231, a rotary gear 232 and a toothed ring 233. The rotary driver 231 is installed on the frame 1, and the rotary gear 232 is sleeved on the driving end of the rotary driver 231. The toothed ring 233 is coaxially connected to the pressing ring 51, and the rotary gear 232 is drivingly connected to the toothed ring 233.

[0067] The function of driving the pressing ring 51 to rotate is realized through the rotary driver 231, the rotary gear 232 and the toothed ring 233. The rotary driver 231 is preferably a servo motor, and the servo motor is electrically connected to the controller. The controller sends a signal to the rotary driver 231, the rotary driver 231 drives the rotary gear 232 to rotate, the rotary gear 232 drives the toothed ring 233 connected to it to rotate, and the toothed ring 233 drives the pressing ring 51 to rotate, thereby driving the guiding frame 2 and the workpiece 6 to rotate.

[0068] Refer to Figure 1 , Figure 8 and Figure 9 : A feeding component 24 is arranged on the frame 1. The feeding component 24 includes a feeding guide rail 241. The feeding guide rail 241 is in a long cylindrical shape and its axis is collinear with the axis of one of the guiding holes.

[0069] Reinforcing ribs 242 are arranged at the bottom of the feeding guide rail 241 and are connected to the frame 1 through the reinforcing ribs 242. One of the guiding holes on the guiding frame 2 is a feeding station.

[0070] The present invention realizes the function of convenient feeding through the feeding guide rail 241 and the reinforcing rib 242. When feeding, the operator needs to insert the workpiece 6 into the guiding hole. For this purpose, the feeding guide rail 241 is designed. The operator places the workpiece 6 on the feeding guide rail 241 and then slides the workpiece 6. Under the guiding action of the feeding guide rail 241, the workpiece 6 is quickly inserted into the guiding hole.

[0071] Refer to Figure 1 、 Figure 3 and Figure 8 : The guiding frame 2 further includes a blanking guide rail 25, and the blanking guide rail 25 is installed on the machine frame 1.

[0072] The present invention realizes the function of automatic blanking through the blanking guide rail 25. A guiding hole adjacent to the feeding guiding hole on the guiding frame 2 is a blanking station, and the cold heading hammer 11, the clamping block 21 and the clamping assembly 22 are not provided at the blanking station to avoid hindering blanking. When the workpiece 6 moves here, the controller sends a signal to the ejecting assembly 13, and the ejecting assembly 13 ejects the workpiece 6 from the guiding hole. The workpiece 6 falls onto the blanking guide rail 25 under the action of gravity, and the blanking guide rail 25 moves the workpiece 6 to the designated blanking place.

[0073] Refer to Figure 2 and Figure 10 : The ejecting assembly 13 includes a second linear driver 131, an ejector rod 132 and an ejecting block 133; the second linear driver 131 is connected to one end of the die 12 away from the cold heading hammer 11; the driving end of the second linear driver 131 is connected to the ejector rod 132; one end of the ejector rod 132 away from the second linear driver 131 is connected to the ejecting block 133.

[0074] The present invention realizes the function of ejecting the workpiece 6 from the die 12 through the second linear driver 131, the ejector rod 132 and the ejecting block 133. The shape of the ejecting block 133 fits the shape of the inner cavity of the die 12, so that the ejecting block 133 can eject the workpiece 6 from the die 12 without affecting the die 12 to process the workpiece 6; the second linear driver 131 is preferably a linear cylinder; after the cold heading of the workpiece 6 is completed, the controller sends a signal to the second linear driver 131, and the second linear driver 131 drives the ejector rod 132 and the ejecting block 133 to slide along the inner wall of the die 12, thereby ejecting the workpiece 6 from the inside of the die 12 into the guiding hole on the guiding frame 2. Then, the workpiece 6 is moved. After the movement is completed, the cold heading hammer 11 presses the workpiece 6 into the die 12 to perform cold heading processing on the workpiece 6.

[0075] Refer to Figure 1 、 Figure 3 and Figure 6: The frame 1 is also provided with a support assembly 14, and the support assembly 14 includes a slide rail 141 and a roller 142; the slide rail 141 is installed on the frame 1, the roller 142 is rotatably installed in the slide rail 141, and the guide frame 2 is in rolling connection with the roller 142.

[0076] The present invention realizes the function of supporting the guide frame 2 without affecting its rotation through the slide rail 141 and the roller 142; a plurality of rollers 142 are provided, and the plurality of rollers 142 are installed in the slide rail 141 at equal intervals; when an operator drives the guide frame 2 to rotate by rotating the driving assembly 23, as the guide frame 2 rotates, rotational friction occurs between the roller 142 and the guide frame 2. While supporting the guide frame 2 through the roller 142, the friction of the slide rail 141 on the guide frame 2 is reduced, thereby improving the stability and smoothness of the rotation of the guide frame 2.

[0077] Refer to Figures 1 - 10 : A cold heading process for a combined piston pin includes the following steps: S1, after the workpiece 6 is sheared, it is installed into the guide hole on the guide frame 2; S2, the workpiece 6 is pressed into the die 12 by the cold heading hammer 11, and the workpieces 6 in the plurality of dies 12 are respectively subjected to shaping, stretching, punching, forming the lower taper angle, forming the upper taper angle, and polishing the inner diameter processes; S3, start the rotary drive assembly 23 to drive the guide frame 2 to rotate, and then take off the processed workpiece 6, and store it in the warehouse after inspection.

[0078] When performing the shaping process, the lower positioning is upset to facilitate positioning during stretching to ensure coaxiality. The purpose of stretching the inner hole is that the inner hole will bulge slightly after forming the upper taper angle, and polishing the inner hole can correct the cylindricity of the inner hole. The piston pin produced by the above process has the advantages of good quality, high die 12 life, and good production stability, and has certain cost advantages and technical advantages in the industry.

[0079] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A cold heading device for a combined piston pin, comprising a frame (1), on which a cold heading hammer (11) and a die (12) are installed; It is characterized in that, An ejection assembly (13) is provided at the mold (12); The cold heading device further comprises a guide frame (2) rotatably mounted on the frame (1), a guide hole for guiding a piston pin being provided on the guide frame (2), and the guide frame (2) further comprises a clamping block (21), a clamping assembly (22) and a rotation driving assembly (23) for driving the guide frame (2) to rotate; The clamping block (21) is slidably mounted on the guide frame (2); the clamping assembly (22) comprises a rotating shaft (221), a roller (222), a synchronous belt, a first mounting seat (224) and a screw; the rotating shaft (221) is rotatably mounted on the guide frame (2); the first mounting seat (224) is mounted on the guide frame (2); the screw is rotatably mounted on the first mounting seat (224); the screw is threadedly connected to the clamping block (21); the roller (222) is sleeved on the rotating shaft (221); and two ends of the synchronous belt are sleeved on the rotating shaft (221) and the screw respectively; The cold heading equipment further comprises a detection assembly (3), wherein the detection assembly (3) comprises a second mounting seat (31), a second synchronous belt (32), a second screw (33), a pressure sensor (34) and a first elastic member (35); The second mounting seat (31) is mounted on the guide frame (2); The two ends of the second synchronous belt (32) are respectively sleeved on the rotating shaft (221) and the second screw rod (33); the second screw rod (33) is rotatably mounted on the second mounting seat (31); the slider (311) is slidably mounted on the second mounting seat (31); the second screw rod (33) is threadedly connected to the slider (311); The pressure sensor (34) is mounted on the second mounting seat (31), and two ends of the first elastic member (35) are respectively connected to the pressure sensor (34) and the slider (311); The cold heading device also includes a clamping assembly (5), the clamping assembly (5) including a pressing ring (51) and a second elastic member (52), the pressing ring (51) being drivingly connected to the driving end of the rotary driving assembly (23); A pressing plate (511) is mounted on the pressing ring (51), and the pressing plate (511) and the positioning plate (41) are connected via a second elastic member (52); The frame (1) also has a support assembly (14), and the support assembly (14) includes a slide rail (141) and a roller (142); The slide rail (141) is mounted on the frame (1), the roller (142) is rotatably mounted in the slide rail (141), and the guide frame (2) is rollingly connected to the roller (142).

2. The cold heading device for a combined piston pin according to claim 1, characterized in that, The cold heading device further comprises a positioning assembly (4), wherein the positioning assembly (4) comprises a positioning plate (41), a mounting frame (42), a first linear drive (43) and a clamping plate (44); The positioning plate (41) is mounted on the guide frame (2), and the mounting frame (42) is mounted on the frame (1); The first linear drive (43) is mounted on the mounting frame (42), and the clamping plate (44) is connected to the driving end of the first linear drive (43).

3. The cold heading device for a combined piston pin according to claim 2, characterized in that, The rotary drive assembly (23) comprises a rotary drive (231), a rotary gear (232) and a gear ring (233); The rotary drive (231) is installed on the frame (1), and the rotary gear (232) is sleeved on the drive end of the rotary drive (231). The toothed ring (233) is coaxially connected to the pressing ring (51), and the rotary gear (232) is in transmission connection with the toothed ring (233).

4. The cold heading device for a combined piston pin according to claim 1, characterized in that, A feeding assembly (24) is arranged on the frame (1). The feeding assembly (24) includes a feeding guide rail (241). The feeding guide rail (241) is in the shape of a long cylinder and its axis is collinear with the axis of one of the guiding holes.

5. The cold heading device for a combined piston pin according to claim 4, characterized in that, The guiding frame (2) further includes a discharging guide rail (25), and the discharging guide rail (25) is installed on the frame (1).

6. The cold heading device for a combined piston pin according to claim 1, characterized in that, The ejecting assembly (13) includes a second linear drive (131), an ejector rod (132) and an ejecting block (133). The second linear drive (131) is connected to the end of the die (12) far from the cold heading hammer (11); the drive end of the second linear drive (131) is connected to the ejector rod (132). One end of the ejector rod (132) far from the second linear drive (131) is connected to the ejecting block (133).

7. A cold heading process for a combined piston pin, using the cold heading device for a combined piston pin according to any one of claims 1 - 6, characterized in that, It includes the following steps: S1, after the workpiece (6) is sheared, install it into the guiding hole on the guiding frame (2). S2, press the workpiece (6) into the die (12) through the cold heading hammer (11), and the workpieces (6) in multiple dies (12) are respectively subjected to processes such as shaping, stretching, punching, forming the lower taper angle, forming the upper taper angle and polishing the inner diameter. S3, start the rotary drive assembly (23), drive the guiding frame (2) to rotate, then remove the processed workpiece (6), and store it in the warehouse after inspection.

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