Plum blossom reducing die assembly for torsional shear type steel structure bolt

Abstract

The utility model discloses a plum blossom reducing die assembly for a torsional shear type steel structure bolt, which comprises an upper guide die, a lower guide die, an upper die sleeve and a lower die sleeve, the lower guide die is mounted in the lower die sleeve, and a lower through hole is formed in the lower guide die; the reducing die is mounted between the lower guide die and the upper guide die, and a plurality of tooth grooves are formed in the reducing die; the upper die sleeve is connected with the lower die sleeve, an upper extrusion head is arranged above the upper through hole, a lower extrusion head is arranged below the lower through hole, a bolt is pressed into the reducing die from the upper through hole through the upper extrusion head, and the bolt is pushed out of the reducing die through the lower extrusion head. And a scraping tooth assembly is arranged on the lower extrusion head, is matched with the reducing die and is used for scraping residual materials in the reducing die. Through the arrangement of the scraping tooth assembly, residual materials in the tooth grooves of the reducing die are effectively scraped, the phenomenon that the die is expanded and broken due to accumulation of the residual materials is avoided, and therefore the service life of the reducing die is remarkably prolonged.

Description

Technical Field

[0001] This utility model relates to the field of fastener processing technology, specifically to a combination of plum blossom diameter reduction molds for torsion shear type steel structure bolts. Background Technology

[0002] Torque-shear bolts are widely used in steel structure engineering in various fields such as construction, bridges, power, marine, and transportation, and are an important tool to ensure the stability and safety of steel structure connections. With continuous technological development, the application scope of torque-shear bolts will further expand. Traditional plum blossom diameter reduction dies are prone to damage; generally, one die can produce about 10 tons of bolts, resulting in a short die life and high cost. Die damage is usually due to wear, chipping, and cracking, primarily caused by residual material in the tooth grooves. To improve production efficiency and reduce production costs, a new type of plum blossom diameter reduction die has been designed, from die structure to material selection, capable of producing 80-90 tons of bolts, significantly extending die life. Utility Model Content

[0003] The purpose of this utility model is to provide a plum blossom diameter reduction mold assembly for torsion shear type steel structure bolts to solve the problem of short service life of existing molds.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a plum blossom diameter reduction mold assembly for torsion-shear type steel structure bolts, comprising:

[0005] An upper guide mold is installed inside an upper mold sleeve, and the upper guide mold is provided with an upper through hole;

[0006] A lower guide mold is installed inside a lower mold sleeve, and the lower guide mold is provided with a lower through hole;

[0007] A reducing die is installed between a lower guide die and an upper guide die, and the reducing die is provided with several toothed grooves.

[0008] The upper and lower die sleeves are connected. An upper extrusion head is provided above the upper through hole, and a lower extrusion head is provided below the lower through hole. The bolt is pressed from the upper through hole into the reducing die by the upper extrusion head, and the bolt is pushed out of the reducing die by the lower extrusion head.

[0009] As a further improvement to the above technical solution:

[0010] The lower extrusion head is equipped with a scraper assembly, which cooperates with the diameter reduction die to scrape off residual material in the diameter reduction die.

[0011] The scraper assembly includes a number of teeth mounted on the lower extrusion head, the number of which is the same as the number of tooth grooves in the diameter reduction die.

[0012] A guide groove is provided in the lower through hole, and a guide block is provided on the lower extrusion head. The guide block is slidably disposed in the guide groove.

[0013] The tooth body is rotatably mounted on the lower extrusion head, and an elastic body is provided between the tooth body and the lower extrusion head. A limit block is provided at the upper part of the lower extrusion head to restrict the upward rotation of the tooth body.

[0014] There is a gap between the farthest point of the tooth extending from the lower extrusion head and the bottom of the tooth groove of the reducing die.

[0015] The reducing die includes an outer shell and a core. The outer shell is located outside the core, and the toothed groove is located inside the core. The outer shell is made of H13 steel, and the core is made of tungsten steel.

[0016] A buffer zone is provided on the upper part of the mold core, and the diameter of the buffer zone is larger than the diameter of the tooth groove working area.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Extending mold lifespan: By incorporating a scraper assembly, residual material within the tooth grooves of the reducing die is effectively removed, preventing die bursting due to material accumulation and significantly extending the die's lifespan. The coordinated design of the scraper assembly and the reducing die ensures cleanliness within the tooth grooves, preventing residual material from affecting bolt forming quality and improving bolt machining accuracy and surface finish.

[0019] Stable operation and prevention of deviation: The sliding arrangement of the guide groove in the lower through hole and the guide block on the lower extrusion head ensures the stability of the lower extrusion head during operation, prevents deviation, effectively protects the inner wall of the diameter reduction die, and avoids unnecessary wear and damage.

[0020] Protecting the tooth groove and preventing damage: The gap design between the farthest point of the tooth extending from the lower extrusion head and the bottom of the tooth groove of the reducing die effectively prevents the tooth from damaging the tooth groove, ensuring the forming quality of the bolt and the long-term stability of the die.

[0021] Reasonable material selection: The reducing die uses an outer shell made of H13 steel and a core made of tungsten steel, which ensures the strength and wear resistance of the die and adapts to the high-intensity and high-frequency processing requirements.

[0022] In summary, the torsion shear type steel structure bolt plum blossom diameter reduction die assembly of this embodiment has significant beneficial effects in terms of improving die service life, ensuring bolt forming quality, stable operation, flexible scraping, protecting tooth grooves, material selection, and operating efficiency. It has high practical value and promising prospects for promotion and application. Attached Figure Description

[0023] Figure 1This is one of the schematic diagrams of the mold assembly structure of this utility model;

[0024] Figure 2 This is the second schematic diagram of the mold assembly structure of this utility model;

[0025] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0026] Figure 4 This is a schematic diagram showing the positional relationship of the extrusion head within the die core of this utility model.

[0027] Reference numerals: 1. Upper guide die; 11. Upper through hole; 2. Upper die sleeve; 10. Upper extrusion head; 3. Reduction die; 31. Outer shell; 32. Die core; 33. Buffer zone; 4. Lower die sleeve; 5. Lower guide die; 50. Lower extrusion head; 501. Guide block; 51. Lower through hole; 511. Guide groove; 6. Scraper assembly; 61. Tooth body; 62. Elastomer; 63. Limiting block. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicating orientation or position, are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[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] like Figures 1 to 4 As shown, the torsion-shear type steel structure bolt pen assembly of this embodiment includes:

[0033] Upper guide mold 1 is installed inside upper mold sleeve 2, and upper guide mold 1 is provided with upper through hole 11;

[0034] The lower guide mold 5 is installed inside the lower mold sleeve 4, and the lower guide mold 5 is provided with a lower through hole 51;

[0035] The reducing die 3 is installed between the lower guide die 5 and the upper guide die 1, and the reducing die 3 is provided with several toothed grooves.

[0036] The upper die sleeve 2 and the lower die sleeve 4 are connected. An upper extrusion head 10 is provided above the upper through hole 11, and a lower extrusion head 50 is provided below the lower through hole 51. The upper extrusion head 10 presses the bolt from the upper through hole 11 into the reducing die 3, and the lower extrusion head 50 pushes the bolt out of the reducing die 3. The upper extrusion head 10 is a punch and a hydraulic cylinder actuator, which moves the upper extrusion head 10 downward by hydraulic pressure. Similarly, the lower extrusion head 50 is a hydraulic cylinder actuator, which moves the lower extrusion head 50 upward by hydraulic pressure.

[0037] Example 1

[0038] The lower extrusion head 50 is provided with a scraper assembly 6, which cooperates with the diameter reduction die 3 to scrape off the residual material in the diameter reduction die 3.

[0039] The scraper assembly 6 includes a number of teeth 61 mounted on the lower extrusion head 50, the number of which is the same as the number of tooth grooves in the diameter reduction die 3.

[0040] A guide groove 511 is provided inside the lower through hole 51, and a guide block 501 is provided on the lower extrusion head 50. The guide block 501 is slidably disposed in the guide groove 511. This arrangement ensures the stable operation of the lower extrusion head 50 and prevents the extrusion head 50 from shifting and damaging the inner wall of the diameter reduction die 3.

[0041] In this embodiment, the scraper assembly 6 is fixedly connected to the lower extrusion head 50, that is, the movement of the lower extrusion head 50 drives the scraper assembly 6 to scrape off the residual material in the tooth groove.

[0042] Example 2

[0043] In this embodiment, the tooth 61 is rotatably mounted on the lower extrusion head 50, and an elastic body 62 is provided between the tooth 61 and the lower extrusion head 50. A limit block 63 is provided on the upper part of the lower extrusion head 50 to restrict the upward rotation of the tooth 61. A buffer zone 33 is provided on the upper part of the mold core 32, and the diameter of the buffer zone 33 is larger than the diameter of the tooth groove working area.

[0044] The elastic body 62 is a spring, and the edge of the tooth 61 is set as a wedge structure. When moving upward, the material in the tooth groove will squeeze the tooth 61, causing the spring to compress. When the lower extrusion head leaves the working area and reaches the buffer zone 33, there is no external force to squeeze the tooth 61. The tooth 61 returns to its original position under the operation of the spring and is limited by the limit block 63. The lower extrusion head 50 moves downward to scrape off the residual material in the tooth groove. This process is downward scraping, which carries the material away from the tooth groove.

[0045] There is a gap between the furthest point of the tooth 61 extending from the lower extrusion head 50 and the bottom of the tooth groove of the reducing die 3. This design prevents the tooth from damaging the tooth groove, which would affect bolt forming and the service life of the die.

[0046] The reducing die 3 includes a shell 31 and a die core 32. The shell 31 is located outside the die core 32, and the toothed groove is opened inside the die core 32. The shell 31 is made of H13 steel, and the die core 32 is made of tungsten steel.

[0047] In use, the bolt to be processed is placed into the upper through hole 11, and the upper extrusion head 10 is activated, causing the bolt to be pushed downward into the diameter reduction die 3 for diameter reduction. After diameter reduction is completed, the lower extrusion head 50 is activated to push the bolt upward away from the diameter reduction die 3, and the bolt is removed, thus completing the diameter reduction process. Because residual material remains in the grooves of the diameter reduction die, long-term use may cause it to burst during the diameter reduction process, affecting its service life.

[0048] Therefore, when the lower extrusion head 50 moves upward, the material in the tooth groove is scraped off by the tooth body 61, which can effectively prevent the mold from cracking due to residual material. This, in turn, extends the service life of the diameter reduction die.

[0049] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A set of staggered diameter reduction molds for torque-shear type steel structure bolts, characterized in that, include: The upper guide mold (1) is installed inside the upper mold sleeve (2), and the upper guide mold (1) is provided with an upper through hole (11). The lower guide mold (5) is installed inside the lower mold sleeve (4), and the lower guide mold (5) is provided with a lower through hole (51). A reducing die (3) is installed between the lower guide die (5) and the upper guide die (1), and the reducing die (3) is provided with a number of toothed grooves; The upper die sleeve (2) and the lower die sleeve (4) are connected. An upper extrusion head (10) is provided above the upper through hole (11), and a lower extrusion head (50) is provided below the lower through hole (51). The bolt is pressed from the upper through hole (11) into the reducing die (3) by the upper extrusion head (10), and the bolt is pushed out from the reducing die (3) by the lower extrusion head (50).

2. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction as described in claim 1, characterized in that: The lower extrusion head (50) is provided with a scraper assembly (6), which cooperates with the diameter reduction die (3) to scrape off the residual material in the diameter reduction die (3).

3. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction mold according to claim 2, characterized in that: The scraper assembly (6) includes a number of teeth (61) mounted on the lower extrusion head (50), the number of which is the same as the number of tooth grooves in the diameter reduction die (3).

4. The star-shaped diameter reduction die assembly for torsion-shear type steel structure bolts according to claim 3, characterized in that: A guide groove (511) is provided in the lower through hole (51), and a guide block (501) is provided on the lower extrusion head (50). The guide block (501) is slidably disposed in the guide groove (511).

5. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction mold according to claim 3, characterized in that: The tooth (61) is rotatably mounted on the lower extrusion head (50). An elastic body (62) is provided between the tooth (61) and the lower extrusion head (50). A limit block (63) is provided on the upper part of the lower extrusion head (50) to restrict the tooth (61) from rotating upward.

6. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction mold according to claim 5, characterized in that: There is a gap between the farthest point of the tooth (61) extending from the lower extrusion head (50) and the bottom of the tooth groove of the reducing die (3).

7. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction mold according to claim 1, characterized in that: The reducing die (3) includes a shell (31) and a die core (32). The shell (31) is located outside the die core (32), and the tooth groove is opened inside the die core (32). The shell (31) is made of H13 steel, and the die core (32) is made of tungsten steel.

8. The torsion shear type steel structure bolt stud assembly with staggered diameter reduction as described in claim 7, characterized in that: The upper part of the mold core (32) is provided with a buffer zone (33), the diameter of which is larger than the diameter of the tooth groove working area.

Images