Thread rolling plate of anti-cracking screw

Abstract

A thread rolling plate of an anti-cracking screw comprises a main thread plate and an auxiliary thread plate. A thread rolling part and a forming part are arranged on the main thread plate and the auxiliary thread plate, and the thread rolling part is provided with a feeding part, a shaping part and a discharging part. The auxiliary tooth plate is provided with a feeding part and a shaping part. Thread rolling edges are arranged on the feeding part, the shaping part and the discharging part, and the shaping part comprises a positioning groove and a forming edge. And the forming edge is arranged between every two thread rolling edges. The forming edge comprises a forming block and a forming groove. And the forming parts are respectively arranged on the main tooth plate and the auxiliary tooth plate. And the positioning groove is formed in the forming part, so that the screw cannot incline during thread rolling. The free end of the forming block is an arc-shaped protrusion, a chip removal part with a concave middle area can be formed on the surface of the screw during thread rolling, the chip removal part can be filled with waste chips during threaded connection, an expansion space is reserved, the stress of a plate can be released, and the plate is prevented from cracking.

Description

Technical Field

[0001] This utility model relates to the field of screw production mold technology, and in particular to a thread rolling plate for anti-cracking screws. Background Technology

[0002] Thread rolling dies are two square templates, one long and one short, used on thread rolling machines to extrude threads from plain screws. They are the most commonly used thread rolling tools in the standard fastener industry for processing screws and bolts. Common thread rolling dies can typically only process one type of thread at a time. However, with advancements in assembly processes, the specifications of screws are also increasing. Screws are now required to provide not only fastening performance but also other functions, such as chip removal and crack prevention. Adding these functions requires structural modifications to the thread to achieve these effects. Current production processes require rolling one type of thread onto the screw blank, with the remaining structure requiring secondary processing by operators using equipment. This process is difficult, results in a high defect rate, and low production efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a thread rolling plate for anti-cracking screws to solve the above-mentioned technical problems.

[0004] A thread rolling slab for anti-cracking screws includes a main thread rolling slab and a secondary thread rolling slab. Each of the main and secondary thread rolling slabs has a thread rolling section and a forming section on the thread rolling section. The thread rolling section, along one end of the main thread rolling slab, has a feeding section, a shaping section, and a discharging section arranged sequentially. The secondary thread rolling slab has the feeding section and the shaping section. The feeding section, shaping section, and discharging section each have multiple thread rolling ridges inclinedly arranged. The shaping section includes multiple positioning grooves perpendicularly arranged at the end of the shaping section away from the discharging section, and multiple forming ridges inclinedly arranged on the shaping section. A forming ridge is provided between every two thread rolling ridges. The forming ridge includes multiple forming blocks and multiple forming grooves arranged between two adjacent forming blocks. The size of the forming blocks gradually increases from the discharging section towards the shaping section.

[0005] Furthermore, both the main tooth plate and the auxiliary tooth plate are rectangular blocks, and the length of the main tooth plate is less than the length of the auxiliary tooth plate.

[0006] Furthermore, the cross-section of the tooth-rolling ridge on the feed section is triangular.

[0007] Furthermore, the cross-section of the tooth-rolling ridge in the middle region of the discharge section and the shaping section is trapezoidal.

[0008] Furthermore, the toothed edge has an angle of 15 degrees with the length side of the main toothed plate and the auxiliary toothed plate.

[0009] Furthermore, positioning grooves are provided on the tooth-rolling edges of both the feeding section and the shaping section near the feeding section.

[0010] Furthermore, the end of the discharge section away from the shaping section is provided with a 10-degree tilt angle.

[0011] Compared with existing technologies, the thread rolling plate for anti-cracking screws provided by this utility model has forming parts respectively set on the main thread plate and the auxiliary thread plate. The forming parts are provided with positioning grooves to ensure that the screw does not tilt during thread rolling, and multiple forming ridges are inclinedly set on the forming parts. Each forming ridge includes multiple forming blocks and multiple forming grooves set between two adjacent forming blocks. The free end of each forming block is an arc-shaped protrusion, which can form multiple chip removal parts with a central recess on the screw surface during thread rolling. These parts can be filled with waste chips during screwing and reserve some expansion space to release the stress on the sheet metal and prevent cracking. Furthermore, it can be used directly after thread rolling without further processing, has low thread rolling error, reduces the defect rate, and improves production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a thread rolling plate for anti-cracking screws provided by this utility model.

[0013] Figure 2 for Figure 1 A magnified view of part A of the thread rolling plate for the anti-cracking screw.

[0014] Figure 3 for Figure 1 A magnified view of part B of the thread rolling plate for the anti-cracking screw.

[0015] Figure 4 for Figure 1 A schematic diagram of the structure of screws produced by a thread rolling die for anti-cracking screws.

[0016] Figure 5 for Figure 4 A schematic diagram of the structure of the screws produced. Detailed Implementation

[0017] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0018] like Figures 1 to 5The diagram shown is a structural schematic of a thread-rolling slab for anti-cracking screws provided by this utility model. The thread-rolling slab for anti-cracking screws includes a main thread plate 10 and a secondary thread plate 20. It is conceivable that the thread-rolling slab for anti-cracking screws also includes other functional structures, such as a fixing structure, a horizontal drive mechanism, an installation structure, etc., which are technologies well known to those skilled in the art and will not be described in detail here.

[0019] The main tooth plate 10 and the auxiliary tooth plate 20 are each provided with a thread rolling part 11 and a forming part 12 provided on the thread rolling part 11. The main tooth plate 10 and the auxiliary tooth plate 20 are provided with the thread rolling part 11 and the forming part 12 facing each other and moving relative to each other to roll threads on the screw surface.

[0020] During the screw forming process, the screw blank is placed between the main thread plate 10 and the auxiliary thread plate 20 and force is applied, then it is rolled to form threads on the surface of the screw blank. Figure 2 The diagram shows the structure of the screw after molding. The screw consists of a screw rod 1, screw threads 2, chip removal part 3, and scraping part 4.

[0021] The thread-rolling section 11 is provided with a feeding section 111, a shaping section 112, and a discharging section 113 sequentially along one end of the main thread plate 10. The auxiliary thread plate 20 is also provided with a feeding section 111 and a shaping section 112. The feeding section 111 guides the screw into the shaping section 112, where the shaping section 112 presses the screw 1 to form the thread 2. The discharging section 113 guides the screw 1 to disengage between the main thread plate 10 and the auxiliary thread plate 20.

[0022] Multiple thread-rolling ridges 13 are inclinedly arranged on the feeding section 111, shaping section 112, and discharging section 113. The thread-rolling ridges 13 on the feeding section 111 have a triangular cross-section, which allows them to embed into the surface of the screw 1 during initial thread rolling, serving a preliminary positioning purpose. The thread-rolling ridges 13 on the discharging section 113 and shaping section 112 have a trapezoidal cross-section. The cross-section of the thread-rolling ridges 13 gradually transitions from triangular to trapezoidal, allowing them to first embed into the surface of the screw 1 during thread rolling, and then gradually embed into the surface of the screw 1 as the main thread plate 10 and the auxiliary thread plate 20 move relative to each other, compressing to form the screw thread 2. The thread-rolling ridges 13 located in the discharging section 113 have a 10-degree inclination angle at the end away from the shaping section 112, allowing the formed screw to better disengage from the thread-rolling ridges 13.

[0023] The threaded edges 13 are all arranged along the length of the main thread plate 10 and the auxiliary thread plate 20, and the extension direction of the threaded edges 13 has an angle of 15 degrees with the length side edge of the main thread plate 10 and the auxiliary thread plate 20. When threading, the threaded threads 2 can be angled, so that they can be better screwed into the plate during screwing.

[0024] The forming part 12 includes multiple positioning grooves 121 vertically arranged at one end of the shaping part 112 away from the discharge part 113, and multiple forming ridges 122 inclinedly arranged on the shaping part 112.

[0025] Each of the positioning grooves 121 is perpendicular to the length of the main tooth plate 10 and the auxiliary tooth plate 20. When the screw 1 enters from the feed section 111 between the main tooth plate 10 and the auxiliary tooth plate 20, the screw 1 is embedded in the positioning groove 121 to prevent the screw 1 from tilting during the tooth rolling process.

[0026] The forming ridge 122 includes a plurality of forming blocks 1221 and a plurality of forming grooves 1222 disposed between two adjacent forming blocks 1221. The dimensions of the forming blocks 1221 gradually increase along the direction from the discharge section 113 to the shaping section 112. Please refer to [link / reference]. Figure 3 Each of the forming blocks 1221 has an arc-shaped protrusion at its free end, which, in conjunction with the forming groove 1222, allows the forming blocks 1221 to form multiple chip removal portions 3 with recessed central areas on the surface of the screw 1 during thread rolling. For details, please refer to [link to specific structure]. Figure 5 During screwing, the recessed area of ​​the chip removal part 3 can be filled with waste chips, and a portion of expansion space is reserved so that the board can expand in the recessed area of ​​the chip removal part 3, thereby releasing the stress of the board from the recessed area of ​​the chip removal part 3, preventing the board from cracking, and allowing excess waste chips to be discharged from the chip removal part 3 to the outside.

[0027] Each of the forming grooves 1222 is recessed between two adjacent forming blocks 1221, so that each end of the chip removal section 3 forms a scraping section 4. (See also...) Figure 5 The scraping part 4 is the most prominent part of the thread 2. Therefore, the scraping part 4 is the first to contact the plate during screwing, thereby playing a scraping role to form threads in the plate.

[0028] In use, the main tooth plate 10 and the auxiliary tooth plate 20 are fixed to each other on both sides. Then, the screw 1 is placed between the main tooth plate 10 and the auxiliary tooth plate 20. The main tooth plate 10 and the auxiliary tooth plate 20 are driven to move towards each other by an external device, which squeezes the screw 1 and makes it rotate. The thread-rolling ridges 13 provided on the tooth plate body 11 are used to extrude and form the screw 1 on the surface of the screw 1 and the forming ridges 122.

[0029] Compared with the prior art, the thread rolling plate for anti-cracking screws provided by this utility model has forming parts 12 respectively provided on the main thread plate 10 and the auxiliary thread plate 20. The forming parts 12 are provided with positioning grooves 121 to ensure that the screw 1 does not tilt during thread rolling, and multiple forming ridges 122 inclinedly provided on the shaping part 112. Each forming ridge 122 includes multiple forming blocks 1221 and multiple forming grooves 1222 provided between two adjacent forming blocks 1221. The free end of each forming block 1221 is an arc-shaped protrusion, which can form multiple chip removal parts 3 with a central recess on the surface of the screw 1 during thread rolling. These chip removal parts can be filled with waste chips during screwing, and a portion of expansion space is reserved to release the stress of the sheet metal and prevent cracking. Furthermore, it can be used directly after thread rolling without further processing, has low thread rolling error, reduces the defect rate, and improves production efficiency.

[0030] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A thread rolling dies for crack-resistant screws, characterized in that: The anti-cracking screw thread rolling plate includes a main thread rolling plate and a secondary thread rolling plate. Each of the main thread rolling plate and the secondary thread rolling plate has a thread rolling part and a forming part on the thread rolling part. The thread rolling part has a feeding part, a shaping part and a discharging part arranged sequentially at one end along the length direction of the main thread rolling plate. The secondary thread rolling plate has a feeding part and a shaping part. The feeding part, the shaping part and the discharging part are all inclinedly provided with multiple thread rolling ridges. The shaping part includes multiple positioning grooves vertically arranged at the end of the shaping part away from the discharging part, and multiple forming ridges inclinedly arranged on the shaping part. A forming ridge is provided between every two thread rolling ridges. The forming ridge includes multiple forming blocks and multiple forming grooves arranged between two adjacent forming blocks. The size of the forming blocks gradually increases along the direction from the discharging part to the shaping part.

2. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: Both the main tooth plate and the auxiliary tooth plate are rectangular blocks, and the length of the main tooth plate is less than the length of the auxiliary tooth plate.

3. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: The cross-section of the toothed edge on the feed section is triangular.

4. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: The cross-section of the tooth-rolling ridge in the middle area of ​​the discharge section and the shaping section is trapezoidal.

5. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: The toothed edge forms a 15-degree angle with the length sides of the main toothed plate and the auxiliary toothed plate.

6. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: Positioning grooves are provided on the tooth-rolling edges of both the feeding section and the shaping section near the feeding section.

7. The thread rolling dies for anti-cracking screws as described in claim 1, characterized in that: The end of the discharge section away from the shaping section is provided with a 10-degree tilt angle.

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