High-efficiency cold upsetting forming die for rivet nut

Abstract

The utility model relates to fastener manufacturing technical field discloses rivet nut high -efficient cold upsetting forming die, including lower mould and upper mould, the inner wall bottom all around of upper mould is established with a plurality of tooth slot, the top all around of lower mould is established with positioning hole, a plurality of the inner wall of positioning hole all is fixedly connected with rubber cover, the bottom all around of upper mould is fixedly connected with positioning rod, a plurality of positioning rod is connected with corresponding rubber cover sliding respectively, the top fixed connection of upper mould has mounting plate no.

Description

Technical Field

[0001] This utility model relates to the field of fastener manufacturing technology, and in particular to a high-efficiency cold heading mold for rivet nuts. Background Technology

[0002] A press-fit nut, also known as a rivet nut or self-locking nut, is a type of nut used on thin plates or sheet metal. It is round in shape with embossed teeth and a guide groove at one end. Its principle is that the embossed teeth are pressed into the pre-set holes in the sheet metal. Generally, the diameter of the pre-set hole is slightly smaller than the embossed teeth of the press-fit nut. The pressure forces the embossed teeth of the press-fit nut into the plate, causing plastic deformation around the pre-set hole. The deformed material is squeezed into the guide groove, thereby producing a locking effect.

[0003] Because rivet nuts have embossed teeth on the outside, traditional cold heading forming involves using a pressure cylinder to quickly engage the upper and lower molds, extruding the raw material into rivet nuts with embossed teeth. During this rapid engagement, deviations occur due to the high speed, resulting in uneven embossed teeth and reduced tightening effectiveness. Existing technology addresses this by adding a positioning rod to the upper mold and a positioning hole to the lower mold. The engagement of the positioning rod with the positioning hole ensures accurate mold closing and neat embossed teeth. However, in actual use, the positioning rod directly contacts the positioning hole, generating friction during sliding. Over time, wear occurs, causing gaps when the positioning rod engages with the positioning hole, leading to wobbling during mold closing and affecting manufacturing quality. Furthermore, the strong impact of the upper mold can deform the work platform, reducing the device's practicality. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a high-efficiency cold heading forming mold for rivet nuts, which aims to improve the existing technology where the positioning rod directly contacts the positioning hole, causing friction during sliding, wear after long-term use, gaps when the positioning rod and positioning hole are engaged, and deformation of the working platform under strong impact from the upper mold.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a high-efficiency cold heading forming mold for rivets and nuts, comprising a lower mold and an upper mold. The lower mold has multiple toothed grooves around its inner bottom perimeter. The lower mold has positioning holes around its top perimeter. Rubber sleeves are fixedly connected to the inner walls of the multiple positioning holes. Positioning rods are fixedly connected to the bottom perimeter of the upper mold, and the multiple positioning rods are slidably connected to their corresponding rubber sleeves. A mounting plate is fixedly connected to the top of the upper mold. A mounting plate is provided at the bottom of the lower mold. Guide rods are fixedly connected to the top perimeter of the mounting plate. Reserved holes are provided around the bottom perimeter of the lower mold. The multiple guide rods are slidably connected to their corresponding reserved holes. Springs are provided on the outer sides of the multiple guide rods. The bottom ends of the multiple springs are fixedly connected to the mounting plate. The top ends of the multiple guide rods are fixedly connected to the lower mold. A demolding mechanism is provided inside the lower mold for rapid demolding.

[0006] As a further description of the above technical solution:

[0007] The demolding mechanism includes a push rod, which is slidably connected to the bottom of the inner wall of the lower mold. The inner wall of the lower mold has a groove. The push rod is connected to the sliding rod of the groove. A second spring is fixedly connected to the bottom of the push rod. The bottom end of the second spring is fixedly connected to the bottom of the inner wall of the groove. A limit rod is fixedly connected to the bottom of the inner wall of the groove. A second reserved groove is opened on the right side of the outer wall of the lower mold. A connecting rod is slidably connected to the inner wall of the second reserved groove. The left end of the connecting rod is fixedly connected to the push rod. A fixing plate is fixedly connected to the right end of the outer wall of the connecting rod. A vertical rod is fixedly connected to the bottom right side of the outer wall of the mounting plate.

[0008] As a further description of the above technical solution:

[0009] A rubber pad is fixedly connected to the top of the lower mold, and multiple positioning rods pass through the rubber pad.

[0010] As a further description of the above technical solution:

[0011] An information board is provided on the front side of the outer wall of the lower mold. Screws are threaded around the outer wall of the information board, and the information board is threaded to the lower mold through the screws.

[0012] As a further description of the above technical solution:

[0013] Indicator arrows are fixedly connected to the front side of the outer wall of both the lower mold and the upper mold, and the two indicator arrows are in opposite directions.

[0014] As a further description of the above technical solution:

[0015] Both the first mounting plate and the second mounting plate have multiple bolts threaded onto their outer walls, which are respectively threaded around the outer walls of the first mounting plate and the second mounting plate.

[0016] As a further description of the above technical solution:

[0017] The outer walls of the bolts are provided with cross grooves, and the surfaces of the bolts are all smoothed.

[0018] As a further description of the above technical solution:

[0019] A reserved groove is provided on the right side of the outer wall of the lower mold. Two retaining rings are fixedly connected to the left side of the inner wall of the reserved groove. A brush is provided inside the reserved groove, and the brush engages with the two retaining rings.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the cooperation between the positioning rod and the rubber sleeve not only ensures accurate and stable positioning, but also reduces hard friction, extends the service life of the mold, and improves the mold closing accuracy. The sliding connection between the guide rod and the reserved hole ensures the stability of the vertical movement of the lower mold, while the shock absorption effect of the spring can effectively absorb and buffer the impact force, greatly reduce the impact on the lower mold, protect the mold structure from damage, improve the working accuracy and stability of the mold, improve production quality, and reduce mold maintenance costs.

[0022] 2. In this utility model, the ejector pin can be accurately positioned during mold closing without affecting the formed workpiece, thus ensuring the quality of cold heading. During demolding, the spring provides effective thrust, which, together with the upright and other components, enables the ejector pin to rise automatically and quickly eject the formed rivet nut. This reduces manual operation, lowers labor intensity, improves demolding efficiency, and enhances the practicality of the device. Attached Figure Description

[0023] Figure 1 This is a perspective view of the high-efficiency cold heading mold for rivet nuts proposed in this utility model;

[0024] Figure 2 This is an exploded view of the high-efficiency cold heading mold for rivet nuts proposed in this utility model;

[0025] Figure 3 This is a partial structural schematic diagram of the high-efficiency cold heading die for rivets and nuts proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of the demolding mechanism of the high-efficiency cold heading mold for rivet nuts proposed in this utility model.

[0027] Figure 5 This is a sectional view of the lower die of the high-efficiency cold heading die for rivets and nuts proposed in this utility model;

[0028] Figure 6 This is a schematic diagram of the reserved groove of the high-efficiency cold heading mold for rivet nuts proposed in this utility model.

[0029] Legend:

[0030] 1. Lower mold; 2. Demolding mechanism; 201. Ejector rod; 202. Slide groove; 203. Spring 2; 204. Limiting rod; 205. Reserved groove 2; 206. Connecting rod; 207. Fixing plate; 208. Upright rod; 3. Upper mold; 4. Toothed groove; 5. Positioning hole; 6. Rubber sleeve; 7. Positioning rod; 8. Mounting plate 1; 9. Mounting plate 2; 10. Guide rod; 11. Reserved hole; 12. Spring 1; 13. Rubber pad; 14. Information board; 15. Screw; 16. Indicator arrow; 17. Bolt; 18. Cross groove; 19. Reserved groove 1; 20. Snap ring; 21. Brush. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a high-efficiency cold heading forming mold for rivet nuts, comprising a lower mold 1 and an upper mold 3. The lower mold 1 is used to form the lower structure of the rivet nut, and the upper mold 3 is used to form the upper structure of the rivet nut. Multiple toothed grooves 4 are formed around the bottom of the inner wall of the upper mold 3 to create embossed teeth. Positioning holes 5 are formed around the top of the lower mold 1 to cooperate with positioning rods 7 for precise positioning. Rubber sleeves 6 are fixedly connected to the inner walls of the multiple positioning holes 5 to reduce friction between the positioning rods 7 and the positioning holes 5 and to provide a buffering effect. Positioning rods 7 are fixedly connected around the bottom of the upper mold 3. The positioning rods 7 cooperate with the rubber sleeves 6 to ensure mold closing accuracy. The multiple positioning rods 7 are slidably connected to their corresponding rubber sleeves 6. A mounting plate 1 is fixedly connected to the top of the upper mold 3 for connecting an external driving device. A mounting plate 2 9 is provided at the bottom of the lower mold 1 for support and connection. Guide rods 10 are fixedly connected around the top of the mounting plate 2 9 to ensure the stability of the vertical movement of the lower mold 1. The mold has a pre-drilled hole 11, which is slidably connected to the guide rod 10. Multiple guide rods 10 are slidably connected to the corresponding pre-drilled hole 11. Springs 12 are provided on the outer side of multiple guide rods 10 to provide shock absorption. The bottom ends of multiple springs 12 are fixedly connected to the mounting plate 9. The top ends of multiple guide rods 10 are fixedly connected to the lower mold 1. The lower mold 1 is equipped with a demolding mechanism 2 for quick demolding and improved production efficiency. A rubber pad 13 is fixedly connected to the top of the lower mold 1 to further buffer the impact and increase the sealing. Multiple positioning rods 7 pass through the rubber pad 13. An information plate 14 is provided on the front side of the outer wall of the lower mold 1 to record mold-related information. Screws 15 are threaded around the outer wall of the information plate 14. The information plate 14 is threaded to the lower mold 1 through the screws 15 to ensure that the information plate 14 is firmly installed. Indicator arrows 16 are fixedly connected to the front side of the outer walls of the lower mold 1 and the upper mold 3 to indicate the installation and movement direction of the mold. The two indicator arrows 16 are in opposite directions.

[0033] Specifically, the mounting plate 8 at the top of the upper mold 3 is connected to an external drive device, driving the upper mold 3 to move downwards. During the downward movement, the positioning rod 7 at the bottom of the upper mold 3 slides against the rubber sleeve 6 inside the positioning hole 5 at the top of the lower mold 1. The rubber sleeve 6 not only reduces the direct hard friction between the positioning rod 7 and the positioning hole 5, but also plays a certain buffering role, ensuring a smooth and accurate positioning process, improving the mold closing accuracy and service life. As the upper mold 3 continues to descend and contacts the lower mold 1, the cold forging process begins. During this process, due to the external pressure, the lower mold 1 will be subjected to a large impact force. At this time, the sliding connection structure between the guide rod 10 at the top of the mounting plate 9 and the reserved hole 11 at the bottom of the lower mold 1 plays a role in ensuring the stability of the vertical movement of the lower mold 1. The spring sleeved on the outside of the guide rod 10... Spring 12 plays a crucial role in shock absorption. When an impact occurs, spring 12 is compressed, absorbing and buffering most of the energy, reducing the impact on the lower mold 1, protecting the mold structure from damage, and maintaining the working accuracy and stability of the mold. Rubber pad 13 can further provide buffering and shock absorption when the upper mold 3 is pressed down to close the mold, reducing the impact on the mold, and also increasing the sealing when the mold is closed. Information plate 14 is used to record relevant information about the mold. The information plate 14 is threaded to the lower mold 1 by screws 15 to ensure that the information plate 14 is firmly installed and not easy to fall off, so that operators can quickly obtain important information about the mold. The indicator arrow 16 points in the opposite direction, which can clearly and intuitively indicate the installation direction and movement direction of the mold during installation and operation, avoiding mold damage or production accidents caused by misoperation.

[0034] Reference Figure 1 , Figure 2 and Figure 3The demolding mechanism 2 includes an ejector rod 201, which is slidably connected to the bottom of the inner wall of the lower mold 1. It ejects the formed rivet nut, thus achieving demolding. A groove 202 is provided on the inner wall of the lower mold 1 to provide a track for the ejector rod 201. The ejector rod 201 is slidably connected to the groove 202 to ensure the linearity and stability of the ejector rod 201's movement. A second spring 203 is fixedly connected to the bottom of the ejector rod 201. The second spring 203 provides a restoring force for the ejector rod 201 and assists in the ejection action during demolding. The bottom end of the second spring 203 is fixedly connected to the bottom of the inner wall of the groove 202 to ensure its fixation and stable operation. A limit rod is fixedly connected to the bottom of the inner wall of the groove 202. 204. The maximum stroke of the ejector rod 201 is limited to prevent excessive movement of the ejector rod 201. A reserved groove 205 is provided on the right side of the outer wall of the lower mold 1. The reserved groove 205 provides space for the movement of the connecting rod 206. The connecting rod 206 is slidably connected to the inner wall of the reserved groove 205. The connecting rod 206 is used to transmit power. The left end of the connecting rod 206 is fixedly connected to the ejector rod 201 to achieve synchronous action. A fixed plate 207 is fixedly connected to the right end of the outer wall of the connecting rod 206. The fixed plate 207 receives external driving force. A vertical rod 208 is fixedly connected to the bottom right side of the outer wall of the mounting plate 1 8. The vertical rod 208 contacts the fixed plate 207 during the mold opening and closing process and pushes the ejector rod 201 to complete the demolding action.

[0035] Specifically, during mold closing, the upright rod 208 on the mounting plate 8 will first contact the fixed plate 207, pushing the fixed plate 207 downward to drive the connecting rod 206 and the ejector rod 201 downward. When the upper mold 3 and the lower mold 1 are in complete contact, the ejector rod 201 will be pushed downward to contact the limit rod 204. At this time, the top of the ejector rod 201 is flush with the bottom of the inner wall of the lower mold 1, which will not affect the formed workpiece. When the cold heading is completed and demolding is required, the ejector rod 201 located at the lower position slides in the slide groove 202. The spring 203 at the bottom of the ejector rod 201 provides reset and a certain pushing force. After the mold completes its work, the upper mold 3 moves upward, and the upright rod 208 on the right side of the bottom of the outer wall of its mounting plate 8 rises accordingly. The fixed plate 207 drives the ejector rod 201 to move upward under the elastic force of the spring 203 through the connecting rod 206, pushing the formed rivet nut out of the lower mold 1 to achieve rapid demolding.

[0036] Reference Figure 1 , Figure 2 and Figure 3Both mounting plate 8 and mounting plate 9 have multiple threaded bolts 17 on their outer walls. These bolts 17 are threaded around the outer walls of mounting plate 8 and mounting plate 9, respectively. The bolts 17 are used to secure mounting plate 8 and mounting plate 9 to other components, ensuring the overall stability of the mold. Each bolt 17 has a cross-shaped groove 18 on its outer wall, facilitating tightening or loosening with tools. The surfaces of all bolts 17 are smoothed to reduce friction with the connecting components, improving ease of installation and disassembly. This also reduces the wear and corrosion of bolt 17; a reserved groove 19 is provided on the right side of the outer wall of the lower mold 1, which provides space for placing the brush 21. Two retaining rings 20 are fixedly connected to the left side of the inner wall of the reserved groove 19. The retaining rings 20 are used to fix the position of the brush 21 and prevent it from falling off. The brush 21 is set inside the reserved groove 19. The brush 21 is used to clean the debris and dust on the surface of the lower mold 1 and keep the mold clean. The brush 21 is engaged with the two retaining rings 20 to ensure the stability of the brush 21 during use and to facilitate the replacement of the brush 21.

[0037] Specifically, multiple bolts 17 are provided on the outer walls of mounting plate 1 8 and mounting plate 2 9 to connect and fix the mold to external equipment. The cross groove 18 facilitates installation and disassembly using a screwdriver. The smooth surface treatment of the bolts 17 reduces friction between them and the connecting parts, making installation smoother. The brush 21 provided in the reserved groove 19 is used to clean debris or dust from the mold surface. The brush 21 engages with the retaining ring 20 to ensure that the brush 21 will not easily fall off during use, and also facilitates the replacement of the brush 21 to maintain its cleaning effect.

[0038] Working principle: Before using the device, the external drive equipment is first connected to the mounting plate 8 on the top of the upper mold 3, causing the upper mold 3 to move downward. The positioning rod 7 at the bottom of the upper mold 3 is inserted into the rubber sleeve 6 in the positioning hole 5 at the top of the lower mold 1. The rubber sleeve 6 reduces the hard friction between the positioning rod 7 and the positioning hole 5, ensuring stable and accurate positioning, improving mold closing accuracy and mold life. When the upper mold 3 continues to descend and contacts the lower mold 1 to start cold heading, the external pressure will cause the lower mold 1 to bear a huge impact force. At this time, the guide rod 10 on the top of the mounting plate 9 slides in the reserved hole 11 at the bottom of the lower mold 1 to ensure the vertical movement of the lower mold 1 is stable. At the same time, the spring 12 on the outside of the guide rod 10 plays a key role in shock absorption. When the impact force occurs, the spring 12 is compressed, absorbing and buffering most of the energy, thereby reducing the impact on the lower mold 1, protecting the mold structure, and maintaining its working accuracy and stability.

[0039] Furthermore, during mold closing, the upright rod 208 on the mounting plate 8 will first contact the fixed plate 207, pushing the fixed plate 207 downward and causing the connecting rod 206 and the ejector rod 201 to move downward. When the upper mold 3 and the lower mold 1 are in complete contact, the ejector rod 201 will be pushed downward to contact the limit rod 204. At this time, the top of the ejector rod 201 is flush with the bottom of the inner wall of the lower mold 1, which will not affect the formed workpiece. When demolding is required after cold heading, the ejector rod 201 located at the lower position slides in the slide groove 202. The spring 203 at the bottom of the ejector rod 201 provides reset and a certain pushing force. After the mold finishes its work, the upper mold 3 moves upward, and the upright rod 208 on the right side of the bottom of the outer wall of its mounting plate 8 rises accordingly. The fixed plate 207 drives the ejector rod 201 to move upward under the elastic force of the spring 203 through the connecting rod 206, pushing the formed rivet nut out of the lower mold 1 to achieve rapid demolding.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency cold heading die for rivet nuts, comprising a lower die (1) and an upper die (3), characterized in that: The upper mold (3) has multiple toothed grooves (4) on the bottom of its inner wall. The lower mold (1) has positioning holes (5) on its top. Rubber sleeves (6) are fixedly connected to the inner walls of the multiple positioning holes (5). Positioning rods (7) are fixedly connected to the bottom of the upper mold (3). The multiple positioning rods (7) are slidably connected to the corresponding rubber sleeves (6). Mounting plate one (8) is fixedly connected to the top of the upper mold (3). Mounting plate two (9) is provided at the bottom of the lower mold (1). The top of mounting plate two (9) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (4) on its inner wall. The lower mold (1) has multiple toothed grooves (5 ...5) on its inner wall. The Each of the guide rods (10) is fixedly connected. The bottom of the lower mold (1) is provided with reserved holes (11) around its perimeter. The multiple guide rods (10) are slidably connected to the corresponding reserved holes (11). The outer side of each of the multiple guide rods (10) is provided with a spring (12). The bottom end of each of the multiple springs (12) is fixedly connected to the mounting plate (9). The top end of each of the multiple guide rods (10) is fixedly connected to the lower mold (1). The lower mold (1) is provided with a demolding mechanism (2) inside. The demolding mechanism (2) is used for quick demolding.

2. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: The demolding mechanism (2) includes a push rod (201), which is slidably connected to the bottom of the inner wall of the lower mold (1). A groove (202) is provided on the inner wall of the lower mold (1). The push rod (201) is slidably connected to the groove (202). A second spring (203) is fixedly connected to the bottom of the push rod (201). The bottom end of the second spring (203) is fixedly connected to the bottom of the inner wall of the groove (202). 2) The bottom of the inner wall is fixedly connected to a limit rod (204). The outer wall of the lower mold (1) is provided with a reserved groove two (205). The inner wall of the reserved groove two (205) is slidably connected to a connecting rod (206). The left end of the connecting rod (206) is fixedly connected to the top rod (201). The right end of the outer wall of the connecting rod (206) is fixedly connected to a fixing plate (207). The bottom right side of the outer wall of the mounting plate one (8) is fixedly connected to a vertical rod (208).

3. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: A rubber pad (13) is fixedly connected to the top of the lower mold (1), and multiple positioning rods (7) pass through the rubber pad (13).

4. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: An information board (14) is provided on the front side of the outer wall of the lower mold (1). Screws (15) are threaded around the outer wall of the information board (14). The information board (14) is threaded to the lower mold (1) through the screws (15).

5. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: The lower mold (1) and the upper mold (3) are both fixedly connected with indicator arrows (16) on the front side of their outer walls, and the two indicator arrows (16) are in opposite directions.

6. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: The outer walls of both the first mounting plate (8) and the second mounting plate (9) are provided with multiple bolts (17) for threaded connection. The multiple bolts (17) are threaded around the outer walls of the first mounting plate (8) and the second mounting plate (9).

7. The high-efficiency cold heading die for rivets and nuts according to claim 6, characterized in that: The outer walls of the plurality of bolts (17) are provided with cross grooves (18), and the surfaces of the plurality of bolts (17) are all smoothed.

8. The high-efficiency cold heading die for rivets and nuts according to claim 1, characterized in that: The lower mold (1) has a reserved groove (19) on the right side of its outer wall. Two retaining rings (20) are fixedly connected to the left side of the inner wall of the reserved groove (19). A brush (21) is provided inside the reserved groove (19), and the brush (21) engages with the two retaining rings (20).

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