A method for hot heading a bolt

Abstract

This invention discloses a bolt hot upsetting method, comprising the following steps: S1, providing a bolt hot upsetting machine; S2, initializing the equipment; S3, inserting the bolt into the shank die; S4, moving the die slide to the hot upsetting station; S5, hot upsetting the heating part of the bolt with a head forming punch; S6, moving the horizontal punch slide away from the bolt, and switching the groove forming punch to the position corresponding to the bolt head; S7, hot upsetting the bolt head again with the groove forming punch; S8, resetting the horizontal punch slide, and driving the die slide to the loading / unloading station; S9, pushing the ejector pin from back to front to separate the formed bolt head from the forming die; S10, horizontally pulling the bolt head to pull the bolt out of the forming die and drop it; S11, repeating steps S3 to S10 for the hot upsetting of the next bolt. This forming method uses horizontal hot upsetting to form the bolt and can perform secondary forming of the bolt head.

Description

Technical Field

[0001] This invention relates to a bolt forming method, which uses a hot upsetting machine for stamping. Background Technology

[0002] Bolt forming is generally achieved through hot upsetting. In this process, the end of the bolt shank is heated to soften the metal at the head. The bolt shank is then inserted into a forming mold, and the head of the bolt shank is hot-upset using a punch of a hot upsetting machine, deforming it to conform to the shape of the mold and forming a bolt. Patent CN117161301B discloses an automatic hot upsetting machine for bolts. The basic principle of this machine is that a conveyor belt transports the bolt, which then slides at an incline into a limiting cylinder. At this point, a lower die moves below the limiting cylinder, and the bolt enters the lower die. The lower die then moves below the upper die for hot upsetting. After hot upsetting, the lower die rotates 180° to face downwards, causing the bolt to fall into a receiving hopper. Once the temperature has decreased, the bottom of the receiving hopper opens, allowing the bolt to fall out. The forming method of this automatic hot upsetting machine for bolts has the following defects: 1. The hot upsetting machine uses an up-and-down method for hot upsetting, with the lower die sliding horizontally. However, its sliding is guided by a guide rod. Due to the large force of hot upsetting, the guide rod may still deform under stress during the downsetting process, resulting in uneven sliding of the lower die and difficulty in aligning the lower die with the upper die. 2. This hot upsetting machine can only complete the one-time forming of the bolt head and cannot perform secondary forming. 3. The unloading of this hot upsetting machine is not smooth. Because the screw is squeezed and filled in the cavity of the lower die during hot upsetting, even if the lower die is rotated 180°, it is difficult to ensure that the bolt is smoothly unloaded. 4. The feeding device of this hot upsetting machine requires flipping the screw's posture, making the structure relatively complex. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bolt hot upsetting method, which uses horizontal hot upsetting to form bolts and can perform secondary forming on the head of the bolt.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for hot upsetting of bolts, the method comprising the following steps:

[0005] S1. A bolt hot upsetting machine is provided, including a machine base, a die slide is horizontally slidably mounted on the machine base, a forming die is mounted on the die slide, the die slide is driven by a die horizontal power device to switch between a hot upsetting station and a loading / unloading station; the forming die includes a rod die and a head die, the rod groove is provided with a rod channel for easy insertion of the bolt rod, the head die is provided with a head forming chamber communicating with the rod channel, a limit sleeve is threadedly fixed to the rear end of the rod die, a limit wall is provided at the rear end of the limit sleeve, a through hole is provided on the limit wall, a ejector rod is inserted into the rod channel, the rear end of the ejector rod passes through the through hole and protrudes, and a limit boss is provided on the ejector rod inside the limit sleeve, which mates with the front end face of the limit wall;

[0006] A horizontal punch slide is slidably mounted on the base, and a punch assembly is mounted on the horizontal punch slide. The horizontal punch slide is driven by a punch horizontal drive device. The punch assembly includes a punch mounting seat fixed on the horizontal punch slide, and a vertical punch slide is slidably mounted on the punch mounting seat. A punch lifting power device for driving the vertical punch slide to rise and fall vertically is mounted on the punch mounting seat. A head forming punch for impact forming the bolt head and a groove forming punch for forming an inner groove on the bolt head are fixedly mounted on the vertical punch slide. An upper limit structure and a lower limit structure are provided at the upper and lower ends of the punch mounting seat to limit the vertical sliding limit position of the vertical punch slide.

[0007] The machine base is also equipped with a feeding device for feeding the screw into the forming groove at the loading and unloading station and a ejection device for removing the formed bolt from the forming die.

[0008] S2. Initialize the equipment. The die slide is in the loading and unloading position, and the head forming punch is at the hot forging height.

[0009] S3. The feeding device inserts the horizontally positioned screw with its end heated from the front end into the rod channel of the rod die, with the heated part of the screw at the front end.

[0010] S4. The die slide is driven to move horizontally from the loading / unloading station to the hot forging station;

[0011] S5. The horizontal driving device of the punch drives the horizontal punch slide to move so that the head forming punch hot-forges the heating part of the screw. The heating part of the screw is punched and squeezed into the head forming cavity of the head die.

[0012] S6. The horizontal driving device of the punch drives the horizontal punch slide to move away from the bolt, and the punch lifting power device drives the vertical punch slide to switch the groove forming punch to the position corresponding to the bolt head.

[0013] S7. The horizontal driving device of the punch drives the horizontal punch slide to move so that the groove forming punch will hot-forge the screw head again to form a groove on the bolt head.

[0014] S8. The punch horizontal drive device drives the horizontal punch slide to reset, and the die slide is driven to the loading and unloading station.

[0015] S9. Push the ejector pin from back to front to separate the head of the formed bolt from the forming die.

[0016] S10. Pull the head of the bolt horizontally to pull the bolt out of the forming die and drop it;

[0017] S11. Repeat steps S3 to S10 to perform hot upsetting of the next bolt.

[0018] As a preferred embodiment, the specific steps for inserting the screw from its front end into the rod channel of the rod die in step S3 are as follows:

[0019] S31. The screw with its end heated in a horizontal position is fed into the inclined surface of the feeding platform. The screw rolls down to the lower end of the inclined surface and is blocked by the side of the guide platform. At this time, the screw is above the lifting plate.

[0020] S32. The lifting plate rises and lifts the screw into the guide platform. At this time, the feeding chute and the guide chute are connected and in the receiving position. The screw rolls down the guide platform into the feeding chute.

[0021] S33. Drive the feeding trough to move horizontally to the loading and unloading station. At this time, the screw in the feeding trough corresponds to the rod channel of the forming groove.

[0022] S34. Use the push rod to horizontally push the screw in the feeding groove into the forming groove to complete the feeding.

[0023] As a preferred embodiment, when the screw is fed into the inclined surface of the feeding platform, the heated section of the screw extends beyond the edge of the feeding platform. When the screw is blocked and stopped by the side of the guide table, the screw is pushed backward to move it backward, and the heated section of the screw enters the area of ​​the feeding platform.

[0024] As a preferred embodiment, the specific method for removing the bolt from the forming die by horizontally pulling its head in step S10 is as follows:

[0025] S101. A lifting and horizontally movable pulling plate is provided, the pulling plate having an insertion hole with an opening at the lower end, the diameter of the insertion hole being larger than the diameter of the bolt shank but smaller than the diameter of the bolt head.

[0026] S102. After the pulling plate moves horizontally to the pulling position, the pulling plate descends so that the insertion hole fits into the bolt shank.

[0027] S103. The bolt is pulled horizontally forward by the pulling plate to disengage it from the forming groove. Then, under the action of gravity, the bolt falls onto the inclined receiving plate.

[0028] S104. The bolts roll down with the receiving plate and fall into the conveyor trough under the obstruction of the baffle plate, where they are conveyed out by the internal conveyor belt.

[0029] As a preferred embodiment, the pulling plate and the pushing rod share a common horizontal movement power.

[0030] As a preferred embodiment, the groove formed by the groove forming punch is a triangular groove or a polygonal groove.

[0031] After adopting the above technical solution, the effect of the present invention is as follows: Compared with the current forming method, the forming method has the following advantages: 1. The bolt is formed by horizontal hot upsetting. When loading and unloading, the screw only needs to be in a horizontal state, without changing the posture of the screw, thus making loading and unloading simpler; 2. The forming method uses the vertical switching of the head forming punch and the groove forming punch to form the bolt in two stages, thereby completing the forming of the bolt with groove. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a three-dimensional structural view of an embodiment of the present invention;

[0034] Figure 2 This is a three-dimensional view of the structure from another angle of an embodiment of the present invention;

[0035] Figure 3 It is a 3D view that hides the feeding platform, the loading chute, and the lifting mechanism;

[0036] Figure 4 yes Figure 1 An enlarged view at point A;

[0037] Figure 5 yes Figure 3 An enlarged view at point B;

[0038] Figure 6 It is a 3D diagram of the pushing mechanism and the pulling structure;

[0039] Figure 7 It is a 3D view of the punch assembly after installation;

[0040] Figure 8 It is a 3D view of the punch assembly;

[0041] Figure 9 It is a 3D view of the feeding platform, the feeding chute, and the lifting mechanism;

[0042] Figure 10 This is a three-dimensional view of the material feeding platform, the material chute, and the lifting mechanism from another angle.

[0043] Figure 11 This is a cross-sectional view of the forming die;

[0044] In the attached diagram: 1. Machine base; 101. First vertical support; 102. Second vertical support; 103. Reinforcing connecting plate; 104. Guide rod; 105. Base; 2. Feeding device; 21. Discharging platform; 22. Guide table; 23. Feeding trough; 24. Trough driving device; 25. Horizontal sliding plate; 26. Lifting power device; 27. Lifting plate; 28. Mounting sleeve 8; 29. ​​Vertical insertion rod; 3. Pushing mechanism; 301. Pushing slide. 302. Material pulling and lifting power device; 303. Material pulling plate; 304. Insertion hole; 305. Push rod; 306. Pushing power device; 307. Pushing connecting plate; 308. Axial pushing force device; 309. Mounting plate; 310. Pushing head; 4. Auxiliary pushing mechanism; 401. Auxiliary fixing plate; 402. Auxiliary pushing force device; 403. Auxiliary pushing slide; 404. Auxiliary push rod; 405. Strip-shaped constraint hole; 5. Forming die; 5 1. Outer die of the rod section; 52. Inner die of the rod section; 53. Rod section channel; 54. Limiting sleeve; 55. Ejector pin; 56. Head connecting die base; 57. Head clamping die; 58. Head clamping plate; 59. Inner die of the head; 510. Head forming chamber; 511. Washer; 6. Die slide; 601. Horizontal punch slide; 602. Punch mounting base; 603. Vertical punch slide; 604. Second mounting base plate; 605. Second punch body; 606, First punch body; 607, First mounting base plate; 608, Punch horizontal drive device; 609, Punch lifting power device; 610, Upper limit structure; 611, Lower limit structure; 612, Side support; 613, Mounting hole; 614, Adaptor hole; 7, Material feeding conveyor device; 701, Receiving plate; 702, Conveying trough; 703, Baffle plate; 704, Conveying belt; 8, Die horizontal power device. Detailed Implementation

[0045] The present invention will be further described in detail below through specific embodiments.

[0046] like Figures 1 to 11 As shown, a method for hot upsetting a bolt includes the following steps:

[0047] S1. A bolt hot upsetting machine is provided, including a machine base 1. A die slide 6 is horizontally slidably mounted on the machine base 1. A forming die 5 is mounted on the die slide 6. The die slide 6 is driven by a die horizontal power device 8 to switch between a hot upsetting station and a loading / unloading station. The forming die 5 includes a rod die and a head die. A rod channel 53 is provided on the rod groove to facilitate the insertion of the bolt rod. A head forming chamber 510 is provided on the head die to communicate with the rod channel 53. A limiting sleeve 54 is threadedly fixed to the rear end of the rod die. A limiting wall is provided at the rear end of the limiting sleeve 54. A through hole is provided on the limiting wall. A ejector rod 55 is inserted into the rod channel 53. The rear end of the ejector rod 55 passes through the through hole and protrudes. A limiting boss that mates with the front end face of the limiting wall is provided on the ejector rod 55 inside the limiting sleeve 54.

[0048] A horizontal punch slide 601 is horizontally slidably mounted on the base 1. A punch assembly is mounted on the horizontal punch slide 601. The horizontal punch slide 601 is driven by a punch horizontal drive device 608. The punch assembly includes a punch mounting seat 602 fixed on the horizontal punch slide 601. A vertical punch slide 603 is vertically slidably mounted on the punch mounting seat 602. A punch lifting power device 609 for driving the vertical punch slide 603 to rise and fall vertically is mounted on the punch mounting seat 602. A head forming punch for impact forming the bolt head and a groove forming punch for forming an inner groove on the bolt head are fixedly mounted on the vertical punch slide 603. An upper limit structure 610 and a lower limit structure 611 are provided at the upper and lower ends of the punch mounting seat 602 to limit the vertical sliding limit position of the vertical punch slide 603.

[0049] The machine base 1 is also provided with a feeding device 2 for feeding the screw into the forming groove at the loading and unloading station and a ejection device for removing the formed bolt from the forming die 5.

[0050] S2. Initialize the equipment. The die slide 6 is in the loading and unloading position, and the head forming punch is at the hot forging height.

[0051] S3. The feeding device 2 inserts the horizontally positioned screw with its end heated into the rod channel 53 of the rod die from the front end, with the heated part of the screw located at the front end. The specific steps in step S3 of inserting the screw from the front end into the rod channel 53 of the rod die are as follows:

[0052] S31. The screw with its end heated in a horizontal position is fed into the inclined surface of the feeding platform 21. The screw rolls down to the lower end of the inclined surface and is blocked by the side of the guide table 22. At this time, the screw is above the lifting plate 27.

[0053] S32, the lifting plate 27 rises and lifts the screw into the guide table 22. At this time, the feeding trough 23 is connected with the guide trough and is in the receiving position. The screw rolls down along the guide table 22 into the feeding trough 23.

[0054] S33, drive the loading trough 23 to move horizontally to the loading and unloading station. At this time, the screw in the loading trough 23 corresponds to the rod channel 53 of the forming groove.

[0055] S34. Use the push rod 305 to horizontally push the screw in the feeding groove 23 into the forming groove to complete the feeding.

[0056] This feeding method eliminates the need to change the screw's orientation, resulting in a simple and error-free feeding process. When the screw is fed into the inclined surface of the feeding platform 21, the heated section of the screw extends beyond the edge of the feeding platform 21. Since the end of the screw needs to be heated, it protrudes beyond the edge of the feeding platform 21, thus exposing the end of the screw. This allows for convenient heating of the end using electric heating to form a heated section. When the screw is blocked and stopped by the side of the guide table 22, it is pushed backward to move the screw backward, allowing the heated section of the screw to enter the area of ​​the feeding platform 21.

[0057] S4, the die slide 6 is driven to move horizontally from the loading and unloading station to the hot forging station;

[0058] S5. The punch horizontal drive device 608 drives the horizontal punch slide 601 to move so that the head forming punch hot-forges the heating part of the screw, and the heating part of the screw is punched and squeezed into the head forming cavity 510 of the head die.

[0059] S6. The horizontal driving device 608 drives the horizontal punch slide 601 to move away from the bolt, and the punch lifting power device 609 drives the vertical punch slide 603 to slide so that the groove forming punch switches to the position corresponding to the bolt head.

[0060] S7. The horizontal driving device 608 drives the horizontal punch slide 601 to move so that the groove forming punch can hot-forge the screw head again to form a groove on the bolt head; the groove formed by the groove forming punch is a triangular groove or a polygonal groove.

[0061] S8, the punch horizontal drive device 608 drives the horizontal punch slide 601 to reset, and the die slide 6 is driven to the loading and unloading station.

[0062] S9. Push the ejector pin 55 from back to front to separate the head of the formed bolt from the forming die 5.

[0063] S10. Pull the head of the bolt horizontally to pull the bolt out of the forming die 5 and then drop it.

[0064] S11. Repeat steps S3 to S10 to perform hot upsetting of the next bolt.

[0065] The specific method for removing the bolt from the forming die 5 by horizontally pulling its head in step S10 is as follows:

[0066] S101. A lifting and horizontally movable pulling plate 303 is provided. The pulling plate 303 is provided with an insertion hole 304 with an opening at the lower end. The diameter of the insertion hole 304 is larger than the diameter of the bolt shank but smaller than the diameter of the bolt head.

[0067] S102, after the pulling plate 303 moves horizontally to the pulling position, the pulling plate 303 descends so that the insertion hole 304 fits onto the bolt shank; the pulling plate 303 and the push rod 305 share a common set of horizontal movement power.

[0068] S103, the pulling plate 303 pulls the bolt horizontally forward to disengage the bolt from the forming groove, and then, under the action of gravity, the bolt falls onto the inclined receiving plate 701.

[0069] S104. The bolt rolls down with the receiving plate 701 and falls into the conveying trough 702 under the obstruction of the baffle plate 703, and is then conveyed out by the conveyor belt 704 inside.

[0070] like Figures 1 to 11 As shown, this embodiment also discloses a bolt hot upsetting machine, including a machine base 1. The machine base 1 includes a base 105, on which a first vertical support 101 and a second vertical support 102 are disposed. A guide rod 104 is disposed between the first vertical support 101 and the second vertical support 102. A horizontal punch slide 601 is horizontally slidably mounted on the guide rod 104. A reinforcing connecting plate 103 is also installed between the first vertical support 101 and the second vertical support 102. A horizontal punch drive device 608 is fixed on the first vertical support 101 and connected to the horizontal punch slide 601. The horizontal punch drive device 608 is preferably a hydraulic cylinder.

[0071] A die slide 6 is horizontally slidably mounted on the base 1. A forming die 5 is mounted on the die slide 6. The die slide 6 is driven by a die horizontal power device 8 to switch between the hot upsetting station and the loading and unloading station.

[0072] The horizontal power unit 8 for the die is preferably a hydraulic cylinder or a pneumatic cylinder. The forming die 5 is also used in the hot upsetting station to correspond with the punch assembly for hot upsetting the screw; the forming groove is used in the loading and unloading station to load the screw and unload the formed bolt.

[0073] like Figure 2 , Figure 3 andFigure 11 As shown, the forming die 5 includes a rod die and a head die. The rod groove is provided with a rod channel 53 for easy insertion of the bolt rod. The head die is provided with a head forming chamber 510 communicating with the rod channel 53. The rear end of the rod die is threadedly fixed with a limiting sleeve 54. The rear end of the limiting sleeve 54 is provided with a limiting wall. The limiting wall is provided with a through hole. A ejector rod 55 is inserted into the rod channel 53. The rear end of the ejector rod 55 passes through the through hole and protrudes. The ejector rod 55 is provided with a limiting boss located inside the limiting sleeve 54, which mates with the front end face of the limiting wall.

[0074] The rod die includes an outer rod die 51 and an inner rod die 52. The inner rod die 52 is inserted into the outer rod die 51 and is limited by a flange at its front end. The inner rod die 52 has a rod channel 53. The flange is pressed and fixed by the head die. The front end of the outer rod die 51 has a flange connecting plate. The head die, the flange connecting plate, and the die slide 6 are detachably fixed together by bolts.

[0075] The head die includes a head connecting die base 56, a head clamping die 57, a head inner die 59, a washer 511, and a head clamping plate 58. The head clamping die 57 is disposed within the head connecting die base 56 and clamps the flange portion. The washer 511 is disposed at the front end of the head clamping die 57 and is clamped by the head inner die 59. The head inner die 59 is embedded and fixed within the head clamping plate 58. The head clamping plate 58, the head connecting die base 56, and the flange connecting plate are connected and fixed by connecting bolts. The head inner die 59 is provided with a head forming chamber 510. The head clamping die 57 and the washer 511 are both provided with connecting channels connecting the head forming chamber 510 and the rod channel 53. This head die can also meet the forming requirements of bolts with different heads by replacing the head clamping plate 58 and the head inner die 59. By changing different inner die 52, it can accommodate the insertion of bolt rods of different diameters, making it convenient to form bolts of different diameters.

[0076] like Figure 7 and Figure 8As shown, a horizontal punch slide 601 is horizontally slidably mounted on the base 1. A punch assembly is mounted on the horizontal punch slide 601. The horizontal punch slide 601 is driven by a punch horizontal drive device 608. The punch assembly includes a punch mounting seat 602 fixed on the horizontal punch slide 601. A vertical punch slide 603 is vertically slidably mounted on the punch mounting seat 602. A punch lifting power device 609 for driving the vertical punch slide 603 to rise and fall vertically is mounted on the punch mounting seat 602. A head forming punch for impact forming the bolt head and a groove forming punch for forming an inner groove on the bolt head are fixedly mounted on the vertical punch slide 603. An upper limit structure 610 and a lower limit structure 611 are provided at the upper and lower ends of the punch mounting seat 602 to limit the vertical sliding limit position of the vertical punch slide 603.

[0077] The head forming punch includes a first mounting base plate 607 and a first punch body 606 fixed on the first mounting base plate 607. The first mounting base plate 607 has horizontally extending slots, and connecting bolts for fixing the first mounting base plate 607 to the vertical punch slide 603 are installed in the slots. The groove forming punch includes a second mounting base plate 604 and a second punch body 605. The second mounting base plate 604 is mounted on the vertical punch slide 603 in the same manner. Side-clamping structures are also provided on the left and right sides of the punch mounting base 602 to clamp the first mounting base plate 607 and the second mounting base plate 604. The horizontal slots allow for changing the horizontal position of the first mounting base plate 607 and the second mounting base plate 604, facilitating accurate adjustment of the punch in the hot forging position during assembly. The side-clamping structures further fix and constrain the head forming punch and the groove forming punch, preventing positional shifts during hot forging. The upper limit structure 610 and the lower limit structure 611 are identical. The upper limit structure 610 includes an upper limit bolt threaded onto the punch mounting base 602. The lower end of the upper limit bolt is adapted to the upper end of the vertical punch slide 603. The upper and lower ends of the punch mounting base 602 are also provided with mounting holes 613 for mounting a buffer. Correspondingly, the vertical punch slide 603 is provided with an adaptation hole 614 adapted to the head of the buffer. Therefore, by rotating the upper limit bolt, the position of its head can be changed, thereby limiting the sliding position of the vertical punch slide 603, resulting in better adaptability.

[0078] like Figure 8 As shown, the side-tightening structure includes a side support 612 bolted to the punch mounting base 602. At least two tightening bolts are threaded onto the side support 612, and the tightening bolts tighten the first mounting base plate 607 and the second mounting base plate 604 from the side.

[0079] The machine base 1 is also provided with a feeding device 2 for feeding the screw into the forming groove at the loading and unloading station and a ejection device for removing the formed bolt from the forming die 5.

[0080] like Figure 1 , Figure 6 , Figure 9 and Figure 10 As shown, the feeding device 2 includes an inclined feeding platform 21 for placing the screw, which is disposed on the base 1. A V-shaped feeding trough 23 is connected to the lower end of the feeding platform 21. The feeding trough 23 is horizontally slidably mounted on the feeding platform 21 and is driven by a feeding trough driving device 24. In this embodiment, the feeding trough driving device 24 is preferably a cylinder.

[0081] A horizontal sliding plate 25 is horizontally mounted on the feeding platform 21. Several mounting sleeves 28 are provided on the horizontal sliding plate 25, and several vertically arranged vertical rods 29 are inserted into the mounting sleeves 28. Tightening bolts are provided on the mounting sleeves 28 to tighten the vertical rods 29. The upper end of each vertical rod 29 is fixed to the feeding trough 23. The feeding trough drive device 24 is fixed to the feeding platform 21 and connected to the horizontal sliding plate 25. The height of the vertical rods 29 can be adjusted, thereby facilitating the adjustment of the height of the feeding trough 23 so that the internal screw corresponds to the forming die 5.

[0082] The material trough driving device 24 drives the feeding trough 23 to switch between the receiving station and the loading / unloading station. When the feeding trough 23 is in the receiving station, it is connected to the lower end of the unloading platform 21. The lower end of the unloading platform 21 is provided with a lifting mechanism that lifts the screw at the lower end and rolls it into the feeding trough 23. The machine base 1 is also equipped with a horizontally sliding pushing mechanism 3 that axially pushes the screw in the feeding trough 23. The lower end of the unloading platform 21 is provided with an inclined guide platform 22, which is higher than the unloading platform 21. The lifting mechanism includes a lifting plate 27 that is vertically slidably installed on the unloading platform 21. The lifting plate 27 is close to the guide platform 22. The upper end of the lifting plate 27 is set as an inclined surface that connects with the unloading platform 21. The lifting plate 27 is driven by a lifting power device 26 installed on the unloading platform 21.

[0083] The base 1 is also equipped with an auxiliary pushing mechanism 4 for pushing the screw end on the feeding platform 21. The auxiliary pushing mechanism 4 includes an auxiliary fixing plate 401 fixed on the base 1. An auxiliary pushing slide 403 is horizontally slidably mounted on the auxiliary fixing plate 401. An auxiliary pushing rod 404 is fixed on the auxiliary pushing slide 403. The auxiliary pushing rod 404 corresponds to the position of the lifting plate 27. An auxiliary pushing force device 402 for driving the auxiliary pushing slide 403 to slide is fixed on the auxiliary fixing plate 401. When the screw end is heated and falls into the feeding platform 21, the heated part generally needs to be suspended. Therefore, the screw end may exceed the feeding platform 21. At this time, the auxiliary pushing mechanism 4 can push the screw axially to keep it completely in place on the feeding platform 21, which facilitates the lifting of the lifting plate 27.

[0084] In this embodiment, the auxiliary fixing plate 401 is provided with a strip-shaped constraint hole 405. The auxiliary fixing plate 401 is fixed to the machine base 1 by bolts constrained in the strip-shaped constraint hole 405. In this way, the auxiliary fixing plate 401 can be adjusted within the range of the strip-shaped constraint hole 405, thereby adjusting the position of the auxiliary push rod 404 and ensuring that the end of the auxiliary push screw can be accurately pushed.

[0085] The pushing mechanism 3 includes a pushing slide 301 slidably mounted on the base 1. The sliding direction of the pushing slide 301 is consistent with the length direction of the feeding groove 23. The pushing slide 301 is fixed with a pushing connecting plate 307. The lower end of the pushing connecting plate 307 is fixed with a pushing rod 305. The height of the pushing rod 305 corresponds to the position of the screw in the feeding groove 23. The base 1 is equipped with a pushing power device 306 that drives the pushing slide 301 to slide horizontally.

[0086] The ejector device includes a mounting bracket fixed to the loading / unloading station. A pushing device is horizontally slidably mounted on the mounting bracket. When the forming die 5 is out of the loading / unloading station, the head of the pushing device pushes against the ejector rod 55. A pulling structure that mates with the bolt head is vertically and vertically mounted on the pusher slide 301. The machine base 1 is also equipped with a dropping conveyor 7 for receiving and conveying the pulled-out bolts. The pushing device includes a mounting plate 309, on which an axial pushing force device 308 is fixed. The power end of the axial pushing force device 308 is connected to a pushing head 310 that mates with the ejector rod 55. The axial pushing force device 308 is preferably a hydraulic cylinder.

[0087] The material pulling structure includes a material pulling lifting power device 302 fixed on the pusher connecting plate 307. The drive end of the material pulling lifting power device 302 is connected to a material pulling plate 303. The material pulling plate 303 is provided with an insertion hole 304 with an open lower end. The diameter of the insertion hole 304 is larger than the diameter of the bolt shank but smaller than the diameter of the bolt head. After the bolt is hot-forged, the forming die 5 moves to the loading and unloading station. At this time, the pusher device slides horizontally and pushes the ejector rod 55 from the rear to the front. The ejector rod 55 pushes the bolt shank in the forming die 5 horizontally, causing the bolt to loosen and move forward a portion. At this time, the bolt head is exposed. Then, the material pulling plate 303 descends horizontally, the insertion hole 304 is fitted onto the bolt shank, and the bolt head is pulled horizontally to pull the bolt out. After being pulled out, the bolt falls into the unloading conveyor 7 and is sent out. This ejection device realizes the ejection of the bolt by horizontal pushing and horizontal pulling, which is suitable for the ejection of long bolts.

[0088] The material conveying device 7 includes a receiving plate 701 fixed on the base 1. The receiving plate 701 is inclined, and a conveying groove 702 is provided at its lower end. A conveying belt 704 for feeding the screw is provided on the conveying groove 702. A baffle plate 703 is provided on the side wall of the conveying groove 702 away from the receiving plate 701, and the baffle plate 703 is higher than the groove wall of the conveying groove 702. The above embodiments are only descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for hot upsetting bolts, characterized in that: The molding method includes the following steps: S1. A bolt hot upsetting machine is provided, including a machine base, a die slide is horizontally slidably mounted on the machine base, a forming die is mounted on the die slide, the die slide is driven by a die horizontal power device to switch between a hot upsetting station and a loading / unloading station; the forming die includes a rod die and a head die, the rod groove is provided with a rod channel for easy insertion of the bolt rod, the head die is provided with a head forming chamber communicating with the rod channel, a limit sleeve is threadedly fixed to the rear end of the rod die, a limit wall is provided at the rear end of the limit sleeve, a through hole is provided on the limit wall, a ejector rod is inserted into the rod channel, the rear end of the ejector rod passes through the through hole and protrudes, and a limit boss is provided on the ejector rod inside the limit sleeve, which mates with the front end face of the limit wall; A horizontal punch slide is slidably mounted on the base, and a punch assembly is mounted on the horizontal punch slide. The horizontal punch slide is driven by a punch horizontal drive device. The punch assembly includes a punch mounting seat fixed on the horizontal punch slide, and a vertical punch slide is slidably mounted on the punch mounting seat. A punch lifting power device for driving the vertical punch slide to rise and fall vertically is mounted on the punch mounting seat. A head forming punch for impact forming the bolt head and a groove forming punch for forming an inner groove on the bolt head are fixedly mounted on the vertical punch slide. An upper limit structure and a lower limit structure are provided at the upper and lower ends of the punch mounting seat to limit the vertical sliding limit position of the vertical punch slide. The machine base is also equipped with a feeding device for feeding the screw into the forming groove at the loading and unloading station and a ejection device for removing the formed bolt from the forming die. S2. Initialize the equipment. The die slide is in the loading and unloading position, and the head forming punch is at the hot forging height. S3. The feeding device inserts the horizontally positioned screw with its end heated from the front end into the rod channel of the rod die, with the heated part of the screw at the front end. S4. The die slide is driven to move horizontally from the loading / unloading station to the hot forging station; S5. The horizontal driving device of the punch drives the horizontal punch slide to move so that the head forming punch hot-forges the heating part of the screw. The heating part of the screw is punched and squeezed into the head forming cavity of the head die. S6. The horizontal driving device of the punch drives the horizontal punch slide to move away from the bolt, and the punch lifting power device drives the vertical punch slide to switch the groove forming punch to the position corresponding to the bolt head. S7. The horizontal driving device of the punch drives the horizontal punch slide to move so that the groove forming punch will hot-forge the screw head again to form a groove on the bolt head. S8. The punch horizontal drive device drives the horizontal punch slide to reset, and the die slide is driven to the loading and unloading station. S9. Push the ejector pin from back to front to separate the head of the formed bolt from the forming die. S10. Pull the head of the bolt horizontally to pull the bolt out of the forming die and drop it; S11. Repeat steps S3 to S10 to perform hot upsetting of the next bolt.

2. The bolt hot upsetting method as described in claim 1, characterized in that: The specific steps for inserting the screw from its front end into the rod channel of the rod die in step S3 are as follows: S31. The screw with its end heated in a horizontal position is fed into the inclined surface of the feeding platform. The screw rolls down to the lower end of the inclined surface and is blocked by the side of the guide platform. At this time, the screw is above the lifting plate. S32. The lifting plate rises and lifts the screw into the guide platform. At this time, the feeding chute and the guide chute are connected and in the receiving position. The screw rolls down the guide platform into the feeding chute. S33. Drive the feeding trough to move horizontally to the loading and unloading station. At this time, the screw in the feeding trough corresponds to the rod channel of the forming groove. S34. Use the push rod to horizontally push the screw in the feeding groove into the forming groove to complete the feeding.

3. The bolt hot upsetting method as described in claim 2, characterized in that: When the screw is fed into the inclined surface of the feeding platform, the heated section of the screw extends beyond the edge of the feeding platform. When the screw is blocked and stops by the side of the guide table, the screw is pushed backward by the auxiliary push from front to back, so that the heated section of the screw enters the area of ​​the feeding platform.

4. The bolt hot upsetting method as described in claim 3, characterized in that: The specific method for removing the bolt from the forming die and dropping it in step S10 by horizontally pulling the bolt head is as follows: S101. A lifting and horizontally movable pulling plate is provided, the pulling plate having an insertion hole with an opening at the lower end, the diameter of the insertion hole being larger than the diameter of the bolt shank but smaller than the diameter of the bolt head. S102. After the pulling plate moves horizontally to the pulling position, the pulling plate descends so that the insertion hole fits into the bolt shank. S103. The bolt is pulled horizontally forward by the pulling plate to disengage it from the forming groove. Then, under the action of gravity, the bolt falls onto the inclined receiving plate. S104. The bolts roll down with the receiving plate and fall into the conveyor trough under the obstruction of the baffle plate, where they are conveyed out by the internal conveyor belt.

5. The bolt hot upsetting method as described in claim 4, characterized in that: The pulling plate and the pushing rod share a common horizontal movement power.

6. The bolt hot upsetting method as described in claim 1, characterized in that: The groove formed by the groove forming punch is a triangular groove or a polygonal groove.

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