A combined die for cold heading, trimming, and punching.

Abstract

This invention discloses a combined mold for cold heading, trimming, and punching. The combined mold includes a main mold assembly and a punching die assembly that can be positioned close to or away from the main mold assembly. The main mold assembly and the punching die assembly are positioned close to each other to trim and punch the pallet blank, enabling the pallet edge and rivet holes to be trimmed, punched, and upset in one operation. The combined mold of this application enables the trimming, punching, and upseting of pallet screws in one operation, solving the problems of low efficiency and unstable quality caused by separate trimming and punching processes. By repeatedly using the combined mold, continuous pallet screw trimming, punching, and upseting can be achieved in one operation, thus meeting the needs of mass production of pallet screws.

Description

Technical Field

[0001] This invention relates to a combined mold for cold heading, trimming, and punching, belonging to the field of cold heading mold technology. Background Technology

[0002] For the connection and fixation of structural components in confined spaces such as aircraft, automobiles, and ships, metal fasteners with brackets, such as bracket screws or bracket bolts, are required. The brackets must have symmetrically formed through holes on both sides (see Chinese Patent Application Publication No. CN119870345A).

[0003] When forming existing pallet screws using the upsetting process, the pallet needs to be trimmed. Traditional manufacturing techniques involve trimming and punching separately, which is inefficient, results in inconsistent quality, and cannot meet the requirements for mass production. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a combined mold for cold heading, trimming and punching.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a combined mold for cold heading, trimming and punching, comprising: a combined mold that enables the edge of the pallet and the rivet hole to be trimmed, punched and upset in one step.

[0007] The combined mold includes a main mold assembly and a punching die assembly that can be relatively close to or far away from the main mold assembly. The main mold assembly and the punching die assembly are relatively close to each other to achieve edge trimming and punching of the pallet blank, so that the edge trimming and punching of the pallet and the rivet holes can be completed in one step.

[0008] The main mold assembly includes a main mold housing that provides an installation base. The main mold, main mold spring sleeve, and main mold rear pad are installed inside the main mold housing. The main mold rear pad is detachably and fixedly connected to the axial surface of the main mold housing by a main mold locking screw. The main mold spring sleeve is located in the middle, and the main mold and main mold rear pad are located at opposite ends of the main mold spring sleeve.

[0009] The main mold is equipped with a main mold guide pin on its outer periphery, which engages with the inner wall of the main mold shell. The main mold and the main mold shell can be slidably engaged through the main mold guide pin.

[0010] The main mold assembly also includes a spring back pad and a perforated pin back pad installed in the main mold spring sleeve. The perforated pin back pad abuts against the main mold back pad. The spring back pad is symmetrically provided with stepped holes to accommodate a first perforated ejector pin and a second perforated ejector pin. The perforated pin back pad and the spring back pad clamp and fix the first perforated ejector pin and the second perforated ejector pin.

[0011] The spring back pad is in contact with the main mold spring and the spring pad can be slidably installed in the main mold spring sleeve; the spring pad is symmetrically provided with holes for the first and second through-hole ejector pins to pass through.

[0012] The main mold core is slidably installed inside the main mold, and the main mold core is provided with a support plate screw hole to accommodate the support plate screw rod on the support plate screw.

[0013] The first and second perforated ejector pins pass through the inner diameter of the main mold spring and the main mold core in sequence; it also includes a main mold ejector rod that can slide through the rear pad of the perforated pin, the rear pad of the spring, the inner diameter of the main mold spring, and the main mold core in sequence, and the main mold ejector rod is provided with a step limit at the rear pad of the spring.

[0014] The die assembly includes a die shell providing an installation base and a die back pad detachably fixed to the die shell via die locking screws. A pressure-bearing blanking pad and a die are installed inside the die shell. A die guide pin is installed on the inner circumference of the die shell, and its sliding guide engagement with the main die positioning pin groove on the outer circumference of the die is possible only. A blanking die spring is installed inside the pressure-bearing blanking pad, which abuts against the die. The blanking die spring provides elastic force when the die slides within the die shell. The pressure-bearing blanking pad has a blanking cavity corresponding to guide hole number one and guide hole number two.

[0015] The die assembly further includes a die core installed inside the die; the die center is provided with a die core hole for the die core to slide; the die is provided with a first guide hole and a second guide hole for the first through-hole ejector pin and the second through-hole ejector pin to guide through.

[0016] The beneficial effects of this invention are as follows: the combined mold of this application can realize the one-time trimming, punching and upsetting of pallet screws, which solves the problem of low efficiency caused by separate trimming and punching. By using the combined mold repeatedly, continuous pallet screw trimming, punching and upsetting production can be realized in one time to meet the mass production of pallet screws. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the support plate screw before the formed through hole is punched out; Figure 2 This is a schematic diagram of the tray screw before punching out the formed through hole in the present invention; Figure 3 This is a schematic diagram of the open state of the combined module of the present invention; Figure 4 This is a schematic diagram of the upsetting state of the combined mold of the present invention; Figure 5 This is a schematic diagram of the structure of the die of the present invention; Figure 6 This is a schematic diagram of the structure of the die core of the present invention; Figure 7This is a schematic diagram of the main mold core of the present invention. Detailed Implementation

[0018] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0019] like Figures 1 to 7 As shown.

[0020] This application discloses a combined mold for cold heading, trimming, and punching, comprising: The main mold assembly and the punching die assembly are relatively close to each other to achieve edge trimming and punching of the pallet blank 1, so that the edge 4 of the pallet and the rivet hole 3 can be trimmed, punched and upset in one go through the combined mold.

[0021] The main mold assembly includes a main mold housing 16 that provides an installation base. The main mold 14, the main mold spring sleeve 17, and the main mold rear pad 20 are installed inside the main mold housing 16. The main mold rear pad 20 is detachably and fixedly connected to the axial surface of the main mold housing 16 by a main mold locking screw 19. The main mold spring sleeve 17 is located in the middle, and the main mold 14 and the main mold rear pad 20 are located at opposite ends of the main mold spring sleeve 17.

[0022] The main mold 14 is equipped with a main mold guide pin 13 on its outer periphery, which cooperates with the inner wall of the main mold shell 16. The main mold 14 and the main mold shell 16 can be slidably engaged through the main mold guide pin 13.

[0023] The main mold assembly also includes a spring back pad 28 and a perforated pin back pad 18 installed in the main mold spring sleeve 17. The perforated pin back pad 18 abuts against the main mold back pad 20. The spring back pad 28 is symmetrically provided with stepped holes to accommodate the first perforated ejector pin 15 and the second perforated ejector pin 25. The first perforated ejector pin 15 and the second perforated ejector pin 25 are clamped and fixed in the perforated pin back pad 18 and the spring back pad 28.

[0024] The spring back pad 28 contacts the spring pad 26 through the main mold spring 27. The spring pad 26 can be slidably installed in the main mold spring sleeve 17. The spring pad 26 has symmetrical holes for the first through-hole ejector pin 15 and the second through-hole ejector pin 25 to pass through.

[0025] The main mold core 24 is slidably installed inside the main mold 14. The main mold core 24 is provided with a support plate screw hole 45 to accommodate the support plate screw rod 2 on the support plate screw 30.

[0026] The first perforated ejector pin 15 and the second perforated ejector pin 25 pass through the inner diameter of the main mold spring 27 and the main mold core 24 in sequence; it also includes a main mold ejector rod 29 that can slide through the perforated pin rear pad 18, the spring rear pad 28, the inner diameter of the main mold spring 27, and the main mold core 24 in sequence, and the main mold ejector rod 29 is provided with a step limit at the spring rear pad 28.

[0027] The die assembly includes a die housing 9 providing an installation base and a die back pad 21 detachably and fixedly connected to the die housing 9 via die locking screws 7. A pressure-bearing blanking pad 22 and a die 23 are installed inside the die housing 9. A die guide pin 12 is installed on the inner circumference of the die housing 9, which can only slide and guide the die 23 through a main die positioning pin groove 34 on the outer circumference of the die 23. A blanking die spring 10 is installed inside the pressure-bearing blanking pad 22, which abuts against the die 23. The blanking die spring 10 provides elastic force when the die 23 slides within the die housing 9. The pressure-bearing blanking pad 22 has a blanking cavity 8 corresponding to a first guide hole 35 and a second guide hole 37.

[0028] The die assembly also includes a die core 11 installed in the die 23; the die 23 has a die core hole 36 at its center for the die core 11 to slide; the die 23 has a first guide hole 35 and a second guide hole 37 for the first through ejector pin 15 and the second through ejector pin 25 to pass through, and the die core 11 and the main die core 24 have the same configuration and correspond to each other.

[0029] Application in the production process. (According to...) Figure 3After assembling and adjusting the mold, it is inserted into the mold cavity and locked with the die locking screw 7 and the main mold locking screw 19 respectively. When upsetting the support plate screw 30, the support plate blank 1 is moved to the end face of the die 23. At this time, the die assembly moves to the right, and the end face of the die 23 contacts the support plate blank 1 of the support plate screw 30. Then, the die assembly pushes the support plate screw 2 of the support plate screw 30 towards the main mold. When the support plate screw rod 2 enters the support plate screw hole 45 of the main mold core 24, the support plate blank 1 contacts the end face of the main mold core 11. The die 23 compresses the blanking die spring 10, and the die assembly slowly... Moving to the right, the pallet screw rod 2 is stably pushed into the main mold core 24; continuing forward, the pallet blank 1 contacts the end face of the main mold 14, and the main mold 14 is supported and limited by the main mold spring sleeve 17 and the main mold rear pad 20, preventing displacement and stopping the movement of the pallet blank 1; the punch core 11 pushes the pallet screw 2 to continue moving to the right, and the end face of the punch core 11 forms a shear with the edge of the inner hole of the main mold 14, cutting off the pallet blank 1 and forming the pallet edge 4 of the pallet screw 30; the punch core 11 pushes the pallet screw 2 to continue moving to the right, and the punch core 11, the pallet screw 2, and the pallet edge... The flange 4 enters the cavity of the main mold 14 and contacts the main mold core 24, pushing the main spring pad 26 to the right. At this time, the main mold spring 27 is compressed and contracts. The first and second perforating ejector pins 15 and 25 are blocked by the spring rear pad 28 and the perforating pin rear pad 18 and move into the main mold 14. The first and second perforating ejector pins 15 and 25 punch out symmetrically distributed forming through holes 3 on both sides of the pallet blank 1, completing the trimming and punching. This allows the combined mold of the present application to achieve one-time trimming, punching and upsetting of the pallet screw 30, solving the problem of separate trimming and punching. The process suffers from inefficiency. The main mold assembly and the punch assembly move in opposite directions. The pallet blank 1 falls between the main mold 14 and the punch 23, relieving the pressure on the main mold spring 27. The main mold spring 27 then stretches back to its original shape through its own elastic force, pushing the spring pad 26 and the main mold core 24 to the left, bringing the pallet screw 30 to the front end of the main mold 14. At this time, the main mold ejector rod 29 moves to the left, pushing out the pallet screw 1, completing the entire process of trimming, punching, and upsetting. The waste material from forming the through hole 3 is squeezed together within the first guide hole 35 and the second guide hole 37, and finally discharged from the blanking cavity 8. Repeating this process enables continuous production and meets the requirements of mass production.

Claims

1. A combined die for cold heading, trimming and piercing, characterized in that, include: A combined mold that enables the edge of the pallet (4) and the rivet hole (3) to be trimmed, punched and upset in one go.

2. The combined die for cold heading trimming and piercing according to claim 1, wherein: The combined mold includes a main mold assembly and a punching die assembly that can be relatively close to or far away from the main mold assembly. The main mold assembly and the punching die assembly are relatively close to each other to cut the edges and punch holes of the pallet blank (1), so that the edges (4) of the pallet and the rivet holes (3) can be cut, punched and upset in one go.

3. The combined die for cold heading trimming and piercing as set forth in claim 2, wherein: The main mold assembly includes a main mold shell (16) that provides an installation base. The main mold (14), main mold spring sleeve (17), and main mold rear pad (20) are installed inside the main mold shell (16). The main mold rear pad (20) is detachably and fixedly connected to the axial surface of the main mold shell (16) by a main mold locking screw (19). The main mold spring sleeve (17) is located in the middle, and the main mold (14) and the main mold rear pad (20) are located at opposite ends of the main mold spring sleeve (17).

4. The combined die for cold heading trimming and piercing as set forth in claim 3, wherein: The main mold (14) is equipped with a main mold guide pin (13) on its outer periphery, which cooperates with the inner wall of the main mold shell (16). The main mold (14) and the main mold shell (16) can be slidably connected through the main mold guide pin (13).

5. The combined die for cold heading trimming and piercing as set forth in claim 4, wherein: The main mold assembly also includes a spring back pad (28) and a perforated pin back pad (18) installed in the main mold spring sleeve (17). The perforated pin back pad (18) abuts against the main mold back pad (20). The spring back pad (28) is symmetrically provided with stepped holes to accommodate the first perforated ejector pin (15) and the second perforated ejector pin (25). The perforated pin back pad (18) and the spring back pad (28) clamp and fix the first perforated ejector pin (15) and the second perforated ejector pin (25).

6. The combined die for cold heading trimming and piercing as set forth in claim 5, wherein: The spring back pad (28) contacts the spring pad (26) through the main mold spring (27), and the spring pad (26) can be slidably installed in the main mold spring sleeve (17); the spring pad (26) is symmetrically provided with holes for the first through-hole ejector pin (15) and the second through-hole ejector pin (25) to pass through.

7. The combined die for cold heading trimming and piercing as set forth in claim 4, wherein: The main mold (14) has a main mold core (24) that can be slidably installed inside it. The main mold core (24) has a support plate screw hole (45) to accommodate the support plate screw rod (2) on the support plate screw (30).

8. The combined die for cold heading trimming and piercing as set forth in claim 6, wherein: The first perforated ejector pin (15) and the second perforated ejector pin (25) pass through the inner diameter of the main mold spring (27) and the main mold core (24) in sequence; it also includes a main mold ejector rod (29) that can slide through the perforated pin back pad (18), the spring back pad (28), the inner diameter of the main mold spring (27), and the main mold core (24) in sequence, and the main mold ejector rod (29) is provided with a step limit at the spring back pad (28).

9. The combined die for cold heading trimming and piercing as set forth in claim 2, wherein: The die assembly includes a die housing (9) providing an installation base and a die back pad (21) detachably and fixedly connected to the die housing (9) by a die locking screw (7); a pressure-bearing blank pad (22) and a die (23) are installed inside the die housing (9); a die guide pin (12) is installed on the inner circumference of the die housing (9) and the main die positioning pin groove (34) on the outer circumference of the die (23) can only slide and guide; a blanking die spring (10) is installed inside the pressure-bearing blank pad (22) to abut against the die (23); the blanking die spring (10) provides elastic force when the die (23) slides inside the die housing (9); the pressure-bearing blank pad (22) is provided with a blanking cavity (8) to correspond to the first guide hole (35) and the second guide hole (37).

10. The combined die for cold-upsetting trimming and piercing according to claim 9, wherein: The die assembly further includes a die core (11) installed in the die (23); the die (23) has a die core hole (36) at its center for the die core (11) to slide; the die (23) has a first guide hole (35) and a second guide hole (37) for the first through ejector pin (15) and the second through ejector pin (25) to pass through.

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