Improved die of cold heading screw

Abstract

The utility model provides an improved die for cold heading screws, which relates to the technical field of screw production and comprises a female die, a base arranged inside the female die, a connecting seat fixedly mounted at one end of the base, two clamping grooves symmetrically arranged on the outer wall of the connecting seat, a membrane shell arranged at one end of the connecting seat far away from the base, and two limiting grooves symmetrically arranged inside the membrane shell. Limiting plates are slidably mounted in the two limiting grooves, openings are formed in the inner walls of the two limiting grooves in a penetrating mode, and clamping blocks are fixedly mounted at the ends, close to the openings, of the limiting plates. According to the utility model, during installation, a worker sleeves the connecting seat with the membrane shell, when the inclined surface of the clamping block is in contact with the outer wall of the connecting seat, the clamping block is extruded to enter the limiting groove, the limiting plate moves to drive the connecting rod and the pulling plate to move and the spring is stretched, and when the clamping block moves to the side of the clamping groove, the clamping block enters the clamping groove under the elastic force of the spring; at the moment, the membrane shell and the base are fixed together, and the connection tightness is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of screw manufacturing technology, and in particular to an improved mold for cold-forging screws. Background Technology

[0002] Screws are essential fasteners in various products. A typical screw consists of a head and a shank. The front of the head is used for assembly with tools, while the back (rear side) is a ring-shaped surface. Insufficient effective area or poor flatness of this surface directly affects the effective contact area between the screw and the locking surface, as well as the uniformity of force distribution on the contact surface. If the effective contact area is too small, the screw is prone to loosening after prolonged use. Uneven force distribution on the contact surface leads to tension imbalance at the screw joint, which can damage the product's surface over time, causing cracking or deformation. Therefore, the effective area and flatness of the back of the screw head are crucial and cannot be ignored.

[0003] In the prior art, such as the improved mold for cold-forging screws in Chinese Patent CN 219004439 U, there is a male mold and a female mold. The female mold has a female mold assembly, which includes a mold shell, a shell cover at the rear of the mold shell, a mold core inside the mold shell, and a venting mechanism at the front of the mold shell and the front end of the mold core. The venting mechanism includes a venting sleeve, multiple venting grooves, and multiple venting holes. This solution rationally designs the venting mechanism, allowing the air pressure generated during cold-forging of the screw head to be released through multiple venting grooves and holes. This reduces the arc radius of the outer edge of the screw head's back and increases the area of ​​the screw head's back, while also improving the flatness of the screw head's back, thus increasing the screw product qualification rate and improving both quality and economic benefits. However, this patent still has the following problems.

[0004] In the aforementioned patent, although the screw-on part is tightened with the thread of the opening so that the front end of the cover is tightly against the rear end of the first cylinder, thereby connecting the membrane shell and the cover together, the threaded connection may wear down due to frequent disassembly and installation during installation and disassembly, resulting in a loose connection and thus affecting the overall performance of the mold. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that the threaded connection may wear down due to frequent disassembly and installation, resulting in a loose connection and thus affecting the overall performance of the mold. Therefore, an improved mold for cold heading screws is proposed.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an improved mold for cold heading screws, including a female mold, a base inside the female mold, a connecting seat fixedly installed at one end of the base, two symmetrical slots symmetrically opened on the outer wall of the connecting seat, a membrane shell provided at the end of the connecting seat away from the base, two symmetrical limiting grooves symmetrically opened inside the membrane shell, a limiting plate slidably installed inside each of the two limiting grooves, an opening penetrating through the inner wall of each of the two limiting grooves, a locking block fixedly installed at the end of the limiting plate near the opening, a fixing seat fixedly installed on the outer wall of the membrane shell, a connecting rod fixedly installed at the end of the limiting plate away from the locking block, the connecting rod penetrating through the membrane shell and the fixing seat and fixedly installed with a pull plate, two springs fixedly installed at the end of the pull plate near the connecting rod, and one end of each spring fixedly connected to the outer wall of the fixing seat.

[0007] Preferably, the fixed base has a rotating groove inside, a rotating ring is rotatably installed inside the rotating groove, a filter ring is fixedly installed on the top of the rotating ring, and the top of the filter ring passes through the fixed base.

[0008] Preferably, a fixing plate is fixedly installed on the top of the fixing base, and a brush is fixedly installed on one end of the fixing plate near the filter ring.

[0009] Preferably, the inner wall of the membrane shell is provided with a venting hole.

[0010] Preferably, two insert plates are fixedly installed on the inner wall of the membrane shell, and two slots are provided on the top of the connecting seat.

[0011] Preferably, a first cylinder is slidably installed inside the membrane shell, and a second cylinder is fixedly installed at the bottom of the first cylinder, with a channel extending through the tops of the first cylinder and the second cylinder.

[0012] Preferably, the outer walls of the two card blocks are respectively attached to the inner walls of the two card slots, and the two sides of the limiting plate are respectively attached to the inner sides of the limiting slot.

[0013] Preferably, the inner wall of the filter ring is in contact with the outer wall of the membrane housing.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0015] 1. In this utility model, during installation, the worker puts the membrane shell on the outside of the connecting seat. When the inclined surface of the locking block contacts the outer wall of the connecting seat, the locking block is squeezed into the limiting groove. The limiting plate moves, driving the connecting rod and the pull plate to move. The spring is stretched. When the locking block moves to the side of the slot, the locking block enters the slot under the elastic force of the spring. At this time, the membrane shell and the base are fixed together, which enhances the tightness of the connection.

[0016] 2. In this utility model, when in use, the through holes on the filter ring can be used to intercept impurities in the air that may enter the vent hole. Furthermore, when there is too much dust in the through holes, the operator can rotate the filter ring. When the ring rotates, the brush will push out the dust in the through holes when the through holes come into contact with the brush, which facilitates cleaning and improves cleaning efficiency. Attached Figure Description

[0017] Figure 1 An overall perspective view of an improved mold for cold heading screws is provided for this utility model;

[0018] Figure 2 A perspective view of the fixing seat of an improved mold for cold heading screws is provided for this utility model;

[0019] Figure 3 A cross-sectional view of the mold shell of an improved mold for cold heading screws is provided for this utility model;

[0020] Figure 4 A cross-sectional view of the fixing seat of an improved mold for cold heading screws is provided for this utility model.

[0021] Legend: 1. Female mold; 2. Membrane shell; 3. Fixing base; 4. Filter ring; 5. Base; 6. Fixing plate; 7. Spring; 8. Pull plate; 9. Limiting groove; 10. Opening; 11. Slot; 12. Limiting plate; 13. Block; 14. Connecting rod; 15. Slot; 16. Insert plate; 17. Connecting base; 18. First cylinder; 19. Second cylinder; 20. Channel; 21. Rotating groove; 22. Rotating ring; 23. Brush; 24. Vent hole. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Example 1, such as Figures 1-4As shown, this utility model provides an improved mold for cold heading screws, including a female mold 1, a base 5 inside the female mold 1, a connecting seat 17 fixedly installed at one end of the base 5, two slots 11 symmetrically opened on the outer wall of the connecting seat 17, a membrane shell 2 is provided at the end of the connecting seat 17 away from the base 5, two limiting grooves 9 symmetrically opened inside the membrane shell 2, a limiting plate 12 is slidably installed inside each of the two limiting grooves 9, an opening 10 is opened through the inner wall of each of the two limiting grooves 9, a locking block 13 is fixedly installed at the end of the limiting plate 12 near the opening 10, a fixing seat 3 is fixedly installed on the outer wall of the membrane shell 2, a connecting rod 14 is fixedly installed at the end of the limiting plate 12 away from the locking block 13, the connecting rod 14 passes through the membrane shell 2 and the fixing seat 3 and a pull plate 8 is fixedly installed, two springs 7 are fixedly installed at the end of the pull plate 8 near the connecting rod 14, and one end of the two springs 7 is fixedly connected to the outer wall of the fixing seat 3.

[0025] The effect achieved by the entire embodiment 1 is that during installation, the operator puts the membrane shell 2 on the outside of the connecting seat 17. When the inclined surface of the locking block 13 contacts the outer wall of the connecting seat 17, the locking block 13 is squeezed into the limiting groove 9. The limiting plate 12 moves, which drives the connecting rod 14 and the pull plate 8 to move. The spring 7 is stretched. When the locking block 13 moves to the side of the slot 11, the locking block 13 enters the slot 11 under the elastic force of the spring 7. At this time, the membrane shell 2 and the base 5 are fixed together, which enhances the tightness of the connection.

[0026] In embodiment 2, the fixed base 3 is further provided with a rotating groove 21 inside, a rotating ring 22 is rotatably installed inside the rotating groove 21, and a filter ring 4 is fixedly installed on the top of the rotating ring 22, with the top of the filter ring 4 penetrating through the fixed base 3.

[0027] Furthermore, a fixing plate 6 is fixedly installed on the top of the fixing base 3, and a brush 23 is fixedly installed on one end of the fixing plate 6 near the filter ring 4.

[0028] Furthermore, an air vent 24 is provided through the inner wall of the membrane shell 2.

[0029] Furthermore, two insert plates 16 are fixedly installed on the inner wall of the membrane shell 2, and two slots 15 are opened on the top of the connecting seat 17.

[0030] Furthermore, a first cylinder 18 is slidably installed inside the membrane shell 2, and a second cylinder 19 is fixedly installed at the bottom of the first cylinder 18. A channel 20 is formed through the top of the first cylinder 18 and the second cylinder 19.

[0031] Furthermore, the outer walls of the two locking blocks 13 are respectively attached to the inner walls of the two locking slots 11 to prevent the membrane shell 2 from shaking and to enhance tightness. The two sides of the limiting plate 12 are respectively attached to the inner sides of the limiting groove 9.

[0032] Furthermore, the inner wall of the filter ring 4 is fitted to the outer wall of the membrane housing 2 to prevent dust from entering the vent hole 24 from between the filter ring 4 and the membrane housing 2.

[0033] The effect achieved by the entire embodiment 2 is that, when in use, the through holes on the filter ring 4 can be used to intercept impurities in the air that may enter the vent hole 24. Furthermore, when there is too much dust in the through holes, the operator can rotate the filter ring 4 and the rotating ring 22 rotates. When the through holes come into contact with the brush 23, the brush 23 will push out the dust in the through holes, which facilitates cleaning by the operator and improves cleaning efficiency.

[0034] Working principle: During installation, the operator places the membrane housing 2 over the connecting base 17. When the inclined surface of the locking block 13 contacts the outer wall of the connecting base 17, the locking block 13 is squeezed into the limiting groove 9. The limiting plate 12 moves, causing the connecting rod 14 and the pull plate 8 to move, and the spring 7 is stretched. At this time, the two insert plates 16 are inserted into the two slots 15 respectively, ensuring that the two locking blocks 13 are above the two slots 11 for easy positioning. When the locking block 13 moves to the side of the slot 11, the locking block 13 enters the slot 11 under the elastic force of the spring 7. At this time, the membrane housing 2 and the base 5 are fixed together, enhancing the tightness of the connection. During disassembly, the operator pulls the pull plate 8. The pull plate 8, through the connecting rod 14 and the limiting plate 12, moves the locking block 13 away from the slot 11, at which point the membrane housing 2 can be pulled out. When in use, the through holes on the filter ring 4 can be used to intercept impurities in the air that may enter the vent hole 24. When there is too much dust in the through holes, the operator can rotate the filter ring 4 and the rotating ring 22 will rotate. When the through holes come into contact with the brush 23, the brush 23 will push out the dust in the through holes, which makes it easier for the operator to clean and improves the cleaning efficiency.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An improved mold for cold heading screws, comprising a female mold (1), characterized in that: The female mold (1) has a base (5) inside. A connecting seat (17) is fixedly installed at one end of the base (5). Two slots (11) are symmetrically opened on the outer wall of the connecting seat (17). A membrane shell (2) is provided at the end of the connecting seat (17) away from the base (5). Two limiting grooves (9) are symmetrically opened inside the membrane shell (2). A limiting plate (12) is slidably installed inside each of the two limiting grooves (9). An opening (10) is opened through the inner wall of each of the two limiting grooves (9). (12) A locking block (13) is fixedly installed at one end near the opening (10). A fixing seat (3) is fixedly installed on the outer wall of the membrane shell (2). A connecting rod (14) is fixedly installed at one end of the limiting plate (12) away from the locking block (13). The connecting rod (14) passes through the membrane shell (2) and the fixing seat (3) and is fixedly installed with a pull plate (8). Two springs (7) are fixedly installed at one end of the pull plate (8) near the connecting rod (14). One end of the two springs (7) is fixedly connected to the outer wall of the fixing seat (3).

2. The improved mold for cold heading screws according to claim 1, characterized in that: The fixed base (3) has a rotating groove (21) inside, and a rotating ring (22) is rotatably installed inside the rotating groove (21). A filter ring (4) is fixedly installed on the top of the rotating ring (22), and the top of the filter ring (4) passes through the fixed base (3).

3. An improved mold for cold heading screws according to claim 1, characterized in that: A fixing plate (6) is fixedly installed on the top of the fixing base (3), and a brush (23) is fixedly installed on one end of the fixing plate (6) near the filter ring (4).

4. An improved mold for cold heading screws according to claim 1, characterized in that: The inner wall of the membrane shell (2) is provided with a vent hole (24).

5. An improved mold for cold heading screws according to claim 1, characterized in that: Two insert plates (16) are fixedly installed on the inner wall of the membrane shell (2), and two slots (15) are opened on the top of the connecting seat (17).

6. An improved mold for cold heading screws according to claim 1, characterized in that: A first cylinder (18) is slidably installed inside the membrane shell (2), and a second cylinder (19) is fixedly installed at the bottom of the first cylinder (18). A channel (20) is opened through the top of the first cylinder (18) and the second cylinder (19).

7. An improved mold for cold heading screws according to claim 1, characterized in that: The outer walls of the two card blocks (13) are respectively attached to the inner walls of the two card slots (11), and the two sides of the limiting plate (12) are respectively attached to the inner sides of the limiting groove (9).

8. An improved mold for cold heading screws according to claim 2, characterized in that: The inner wall of the filter ring (4) is attached to the outer wall of the membrane shell (2).

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