Bolt cold upset forming die structure

Abstract

The application discloses a bolt cold upsetting forming die structure and relates to the technical field of bolt processing, which improves the phenomenon that a bolt rod needs to be pushed out of a die hole by external power, comprises a main die and a bottom die, the main die and the bottom die are connected through a connecting assembly, a plurality of die cores are installed on the main die, a forming hole is arranged in each die core, a material-ejecting hole is arranged in the main die, the diameter of the material-ejecting hole is greater than or equal to the diameter of a threaded section of the bolt rod, a material-ejecting assembly is arranged in the bottom die, the material-ejecting assembly comprises a limiting column fixedly arranged in the bottom die, a pressing column is arranged in the limiting column in a penetrating mode, one end of the pressing column extends into the material-ejecting hole, a cam is arranged in the pressing column in a penetrating mode, an abutting rod is arranged at the end of the cam away from the pressing column, and a telescopic rod is fixedly connected to the end of the abutting rod away from the cam, the bolt rod in the main die can be automatically pushed out, and the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of bolt processing technology, and in particular to the structure of bolt cold heading forming mold. Background Technology

[0002] Bolts, as core components of mechanical connections, are widely used in the automotive, aerospace, and construction industries. Cold heading, with its advantages of high efficiency, high precision, and low material loss, has become the mainstream technology for large-scale bolt production. Cold heading dies, as key equipment in this process, directly affect the bolt forming quality, production efficiency, and die life. With the manufacturing industry's increasing demands for bolt performance (such as high strength, high precision, and complex structures), there is a growing need to optimize the structure of cold heading dies.

[0003] In the use of existing cold heading dies, after cold heading, the screw needs to be ejected from the die hole by external power (usually by using a hydraulic cylinder to drive the ejector rod to move back and forth to eject the screw). This increases the complexity of the cold heading equipment, increases the equipment cost, and reduces the practicality of the device. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the problems existing in the prior art, this utility model provides a bolt cold heading forming mold structure.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a bolt cold heading forming mold structure, comprising a main mold and a bottom mold, wherein the main mold and the bottom mold are connected by a connecting component, wherein multiple mold cores are installed on the main mold, each mold core having a forming hole in the middle, an ejector hole is provided inside the main mold, the diameter of the ejector hole being greater than or equal to the diameter of the threaded section of the screw, and an ejector component is provided inside the bottom mold.

[0008] In a preferred embodiment of the bolt cold heading die structure of this utility model, the ejector assembly includes a limiting post fixedly disposed inside the bottom die. A pressing post is inserted inside the limiting post, and one end of the pressing post extends into the ejector hole. A cam is inserted inside the pressing post. An abutting rod is disposed at the end of the cam away from the pressing post. A telescopic rod is fixedly connected to the end of the abutting rod away from the cam. The other end of the telescopic rod abuts against the inner bottom wall of the limiting post. An abutting block is fixedly connected to the outer surface of the telescopic rod. A spring is disposed between the inner wall of the limiting post and the outer surface of the abutting block.

[0009] As a preferred embodiment of the bolt cold heading forming mold structure of this utility model, the lower end of the pressing column is serrated and has a slot, the outer surface of the cam is provided with a tooth block, the cam is movably connected to the lower end of the pressing column through the tooth block, the inner surface of the limiting column is provided with a guide rail, and the pressing column is slidably connected to the limiting column through the slot and the guide rail.

[0010] In a preferred embodiment of the bolt cold heading die structure of this utility model, the two ends of the spring are fixedly connected to the inner wall of the limiting post and the outer surface of the abutment block, respectively, and the spring is sleeved on the outer surface of the telescopic rod.

[0011] In a preferred embodiment of the bolt cold heading die structure of this utility model, the connecting assembly includes a first connecting block fixedly connected to the outer wall of the main die, a second connecting block fixedly connected to the outer wall of the bottom die, a fixing rack fixedly connected to the lower surface of the first connecting block, a connecting groove formed on the upper surface of the second connecting block, a fixing block fixedly connected to the inner wall of the connecting groove, a moving block inserted inside the second connecting block, a locking block fixedly connected to the outer surface of the moving block, and a telescopic spring fixedly connected to one side of each of the two moving blocks, with the other end of the telescopic spring connected to the fixing block.

[0012] In a preferred embodiment of the bolt cold heading die structure of this utility model, the locking block is an L-shaped structure and is used in conjunction with the fixing rack.

[0013] As a preferred embodiment of the bolt cold heading forming mold structure of this utility model, the multiple mold cores include three mold cores: mold core one, mold core two, and mold core three, and the three mold cores are provided with different forming holes. The mold core one, mold core two, and mold core three are provided with positioning ears on both sides, and the positioning ears are provided with mounting holes. The main mold is provided with positioning grooves that cooperate with the positioning ears.

[0014] As a preferred embodiment of the bolt cold heading forming mold structure of this utility model, the main mold has a lubrication groove inside, the lubrication groove is connected to the ejector hole, the upper surface of the bottom mold is fixedly connected with a positioning pin, and the corresponding position of the lower surface of the main mold is provided with a pin hole that cooperates with the positioning pin.

[0015] (III) Beneficial Effects

[0016] This utility model provides a bolt cold heading forming die structure. It has the following beneficial effects:

[0017] 1. Through the ejector assembly, the screw presses the pressing column, which in turn drives the cam to move forward. The toothed block on the cam is movably connected to the serrated part at the lower end of the pressing column. When the pressing column moves forward through the slot and guide rail, it drives the toothed block on the outer surface of the cam to move up and down along the edge of the guide rail. When the toothed block on the outer surface of the cam moves to the outside of the guide rail and slides to the edge of the guide rail, the cam will rotate, causing the abutment rod to push the telescopic rod forward. At this time, both the telescopic rod and the spring are compressed. After the screw is cold-forged, the elastic potential energy of the spring drives the telescopic rod to move upward, causing the abutment block to push the abutment rod upward. The cam reverses and drives the pressing column to lift the screw upward, which can automatically eject the cold-forged screw, improving the practicality of the device.

[0018] 2. By connecting the components and pressing the movable block, the movable block moves the locking block inward toward the fixed block. At this time, the telescopic spring is compressed, and the first connecting block moves downward, causing the fixed rack to move downward and into the connecting groove. Then, the movable block is released, and the elastic potential energy of the telescopic spring drives the locking block to move to both sides, so that the locking block engages with the fixed rack, thereby connecting the first connecting block and the second connecting block and improving the practicality of the device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a cross-sectional view of the main mold in this utility model.

[0022] Figure 3 This is a top view of the main mold in this utility model.

[0023] Figure 4 This is a schematic diagram of the internal structure of the limiting post in this utility model.

[0024] Figure 5 This is a schematic diagram of the internal structure of the limiting column in this utility model.

[0025] Figure 6 This is a schematic diagram of the connecting component in this utility model.

[0026] In the diagram, 1. Main mold; 2. Bottom mold; 3. Ejector assembly; 301. Limiting post; 302. Pressing post; 303. Cam; 304. Abutment rod; 305. Telescopic rod; 306. Spring; 307. Abutment block; 4. Connecting assembly; 401. First connecting block; 402. Second connecting block; 403. Fixed rack; 404. Fixed block; 405. Moving block; 406. Locking block; 407. Telescopic spring; 5. Mold core one; 6. Mold core two; 7. Mold core three; 8. Lubrication groove; 9. Positioning pin; 10. Screw; 11. Positioning ear; 12. Mounting hole. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] Example 1

[0029] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 This is the first embodiment of the present utility model. This embodiment provides a bolt cold heading forming mold structure, including a main mold 1 and a bottom mold 2. The main mold 1 and the bottom mold 2 are connected by a connecting component 4. Multiple mold cores are installed on the main mold 1. Each mold core is provided with a forming hole in the middle. An ejector hole is provided inside the main mold 1. The diameter of the ejector hole is greater than or equal to the diameter of the threaded section of the screw 10. An ejector component 3 is provided inside the bottom mold 2.

[0030] The ejector assembly 3 includes a limiting post 301 fixedly installed inside the bottom mold 2. A pressing post 302 is inserted inside the limiting post 301, and one end of the pressing post 302 extends into the ejector hole. A cam 303 is inserted inside the pressing post 302. An abutting rod 304 is provided at the end of the cam 303 away from the pressing post 302. A telescopic rod 305 is fixedly connected at the end of the abutting rod 304 away from the cam 303. The other end of the telescopic rod 305 abuts against the inner bottom wall of the limiting post 301. An abutting block 307 is fixedly connected to the outer surface of the telescopic rod 305. A spring 306 is provided between the inner wall of the limiting post 301 and the outer surface of the abutting block 307.

[0031] Specifically, the lower end of the pressing column 302 is serrated and has a slot. The outer surface of the cam 303 is provided with a toothed block. The cam 303 is movably connected to the lower end of the pressing column 302 through the toothed block. The inner surface of the limiting column 301 is provided with a guide rail. The pressing column 302 is slidably connected to the limiting column 301 through the slot and the guide rail. The two ends of the spring 306 are fixedly connected to the inner wall of the limiting column 301 and the outer surface of the abutment block 307, respectively. The spring 306 is sleeved on the outer surface of the telescopic rod 305.

[0032] Furthermore, through the ejector assembly 3, the screw 10 presses the pressing column 302, which in turn drives the cam 303 to move forward. The toothed block on the cam 303 is movably connected to the serrated edge of the lower end of the pressing column 302. When the pressing column 302 moves forward through the slot and guide rail, it drives the toothed block on the outer surface of the cam 303 to move up and down along the edge of the guide rail. When the toothed block on the outer surface of the cam 303 moves to the outside of the guide rail and slides to the edge of the guide rail, the cam 303 will rotate, causing the abutment rod 304 to push the telescopic rod 305 forward. At this time, both the telescopic rod 305 and the spring 306 are compressed. After the screw 10 is cold-forged, the elastic potential energy of the spring 306 drives the telescopic rod 305 to move upward, causing the abutment block 307 to push the abutment rod 304 upward. The cam 303 reverses and drives the pressing column 302 to lift the screw 10 upward, which can automatically eject the cold-forged screw 10, improving the practicality of the device.

[0033] Example 2

[0034] Reference Figure 1 , Figure 2 , Figure 3 and Figure 6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0035] The connecting component 4 includes a first connecting block 401 fixedly connected to the outer wall of the main mold 1, a second connecting block 402 fixedly connected to the outer wall of the bottom mold 2, a fixing rack 403 fixedly connected to the lower surface of the first connecting block 401, a connecting groove opened on the upper surface of the second connecting block 402, a fixing block 404 fixedly connected to the inner wall of the connecting groove, a moving block 405 inserted inside the second connecting block 402, a locking block 406 fixedly connected to the outer surface of the moving block 405, and a telescopic spring 407 fixedly connected to the opposite side of each of the two moving blocks 405, and the other end of the telescopic spring 407 connected to the fixing block 404.

[0036] Specifically, the locking block 406 has an L-shaped structure and is used in conjunction with the fixed rack 403. The multiple mold cores include three mold cores: mold core one 5, mold core two 6, and mold core three 7. The three mold cores are provided with different forming holes. Mold core one 5, mold core two 6, and mold core three 7 are provided with positioning ears 11 on both sides. The positioning ears 11 are provided with mounting holes 12. The main mold 1 is provided with positioning grooves that cooperate with the positioning ears 11. The main mold 1 is provided with a lubrication groove 8 inside. The lubrication groove 8 is connected to the ejector hole. The upper surface of the bottom mold 2 is fixedly connected with a positioning pin 9. The corresponding position on the lower surface of the main mold 1 is provided with a pin hole that cooperates with the positioning pin 9.

[0037] Furthermore, by connecting component 4 and pressing the moving block 405, the moving block 405 drives the locking block 406 to move inward to the fixing block 404. At this time, the telescopic spring 407 is compressed, and the first connecting block 401 moves downward, driving the fixing rack 403 to move downward and into the connecting groove. At this time, the moving block 405 is released, and the elastic potential energy of the telescopic spring 407 drives the locking block 406 to move to both sides, so that the locking block 406 engages with the fixing rack 403, thereby connecting the first connecting block 401 and the second connecting block 402, improving the practicality of the device. The forming hole of the mold core 1 5 forms the head of the screw 10 into a large cylindrical shape (diameter larger than the rod body), the mold core 2 6 further forms a cylinder with the thickness of a nut, and the mold core 3 7 directly cold-forges it into an internal hexagon or external hexagon shape.

[0038] Working principle: In use, the screw 10 presses the pressing pin 302, which drives the cam 303 forward. The toothed block on the cam 303 is movably connected to the sawtooth at the lower end of the pressing pin 302. When the pressing pin 302 moves forward through the slot and guide rail, it drives the toothed block on the outer surface of the cam 303 to move up and down along the edge of the guide rail. When the toothed block on the outer surface of the cam 303 moves to the outside of the guide rail and slides to the edge of the guide rail, the cam 303 will rotate, causing the abutment rod 304 to push the telescopic rod 305 forward. At this time, both the telescopic rod 305 and the spring 306 are compressed. After the screw 10 is cold-forged, the elastic potential energy of the spring 306 drives the telescopic rod 305 to move upward, causing the abutment block 307 to push the abutment rod 304 upward. The cam 303 then reverses, causing the pressing pin 302 to lift the screw 10 upward. The screw 10 after cold heading can be automatically ejected. The positioning ear 11 structure facilitates installation and positioning. Lubricating oil can be dripped through the lubrication groove 8 to reduce wear on the pressing column 302 and reduce friction. Through the connecting component 4, by pressing the moving block 405, the moving block 405 drives the locking block 406 to move inward to the fixed block 404. At this time, the telescopic spring 407 is compressed, and the first connecting block 401 moves downward, driving the fixed rack 403 to move downward and into the connecting groove. At this time, the moving block 405 is released, and the elastic potential energy of the telescopic spring 407 drives the locking block 406 to move to both sides, so that the locking block 406 engages with the fixed rack 403, thereby connecting the first connecting block 401 and the second connecting block 402, improving the practicality of the device. The positioning pin 11 structure facilitates installation and positioning.

[0039] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A bolt cold heading forming die structure, comprising a main die (1) and a bottom die (2), characterized in that: The main mold (1) and the bottom mold (2) are connected by a connecting component (4). The main mold (1) is equipped with multiple mold cores, each mold core having a forming hole in the middle. The main mold (1) has an ejector hole inside, the diameter of which is greater than or equal to the diameter of the threaded section of the screw (10). The bottom mold (2) has an ejector component (3).

2. The bolt cold heading forming die structure according to claim 1, characterized in that: The ejector assembly (3) includes a limiting post (301) fixedly installed inside the bottom mold (2). A pressing post (302) is inserted inside the limiting post (301), and one end of the pressing post (302) extends into the ejector hole. A cam (303) is inserted inside the pressing post (302). An abutment rod (304) is provided at the end of the cam (303) away from the pressing post (302). A telescopic rod (305) is fixedly connected at the end of the abutment rod (304) away from the cam (303). The other end of the telescopic rod (305) abuts against the inner bottom wall of the limiting post (301). An abutment block (307) is fixedly connected to the outer surface of the telescopic rod (305). A spring (306) is provided between the inner wall of the limiting post (301) and the outer surface of the abutment block (307).

3. The bolt cold heading forming die structure according to claim 2, characterized in that: The lower end of the pressing column (302) is serrated and has a slot. The outer surface of the cam (303) is provided with a tooth block. The cam (303) is movably connected to the lower end of the pressing column (302) through the tooth block. The inner surface of the limiting column (301) is provided with a guide rail. The pressing column (302) is slidably connected to the limiting column (301) through the slot and the guide rail.

4. The bolt cold heading forming die structure according to claim 3, characterized in that: The two ends of the spring (306) are fixedly connected to the inner wall of the limiting post (301) and the outer surface of the abutment block (307), respectively, and the spring (306) is sleeved on the outer surface of the telescopic rod (305).

5. The bolt cold heading forming die structure according to claim 1, characterized in that: The connecting component (4) includes a first connecting block (401) fixedly connected to the outer wall of the main mold (1), a second connecting block (402) fixedly connected to the outer wall of the bottom mold (2), a fixed rack (403) fixedly connected to the lower surface of the first connecting block (401), a connecting groove opened on the upper surface of the second connecting block (402), a fixed block (404) fixedly connected to the inner wall of the connecting groove, a moving block (405) inserted inside the second connecting block (402), a locking block (406) fixedly connected to the outer surface of the moving block (405), and a telescopic spring (407) fixedly connected to the opposite side of the two moving blocks (405), and the other end of the telescopic spring (407) is connected to the fixed block (404).

6. The bolt cold heading forming die structure according to claim 5, characterized in that: The card block (406) has an L-shaped structure and is used in conjunction with the fixed rack (403).

7. The bolt cold heading forming die structure according to claim 1, characterized in that: The multiple mold cores include three mold cores: mold core one (5), mold core two (6), and mold core three (7). The three mold cores are provided with different forming holes. Both sides of mold core one (5), mold core two (6), and mold core three (7) are provided with positioning ears (11). The positioning ears (11) are provided with mounting holes (12). The main mold (1) is provided with positioning grooves that cooperate with the positioning ears (11).

8. The bolt cold heading forming die structure according to claim 1, characterized in that: The main mold (1) has a lubrication groove (8) inside, which is connected to the ejector hole. The upper surface of the bottom mold (2) is fixedly connected with a positioning pin (9), and a pin hole that cooperates with the positioning pin (9) is provided at the corresponding position on the lower surface of the main mold (1).

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