A large flange bolt cold heading die and a large flange bolt

Abstract

The utility model belongs to cold heading die technical field, concretely relates to a big flange bolt cold heading die. Its bearing surface inclination is 0-0.6 degrees, its bearing surface inclination is 0.5-0.6 degrees, make its production big flange bolt have very good self locking, far more than national standard, international standard and German standard. The front and rear surfaces of male die shell are through first through -hole, the inside of the front end of male die shell is equipped with first pad, the rear surface of first pad is connected with hexagonal punch needle, the inside of the rear end of male die shell is equipped with male die core, and hexagonal punch needle inserts into male die core and stamps big flange bolt head and forms; The front and rear surfaces of female die shell are through second through -hole, the inside of the front end of female die shell is equipped with die beating module, the front and rear surfaces of die beating module are through third through -hole, the inside of third through -hole is equipped with female die core; The front and rear surfaces of female die core are through first forming hole, and the periphery of first forming hole is inclined to form bearing surface, and the inclination angle of bearing surface is 0.5-0.6 degrees; Male die core and female die core stamp big flange bolt flange plate.

Description

Technical Field

[0001] This utility model belongs to the field of cold heading mold technology, specifically relating to a cold heading mold for large flange bolts. Background Technology

[0002] Bolts on the large flange drive shaft are mainly used on the drive shaft, which is the shaft that transmits torque between the gearbox reducer and the transmission wheel. Universal joints are provided at its inner and outer ends to adapt to various road conditions during vehicle operation and ensure the smoothness and reliability of power transmission.

[0003] Traditional standard flange bolts cannot meet the requirements of drive shafts, which play a crucial role in transmitting torque, balancing wheel speeds, and ensuring vehicle stability and safety. Since the components in the drive shaft connection are rigid, careful consideration must be given to the clamping length and the strength of the connected parts when designing and selecting bolts. Fully threaded bolts are preferable, and choosing the correct bolt support angle is also very important.

[0004] Therefore, a new set of molds needs to be designed so that the bearing face angle of the large flange bolts meets the national standard requirement of 0-1°30′. Summary of the Invention

[0005] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a cold heading mold for large flange bolts, with a bearing surface inclination angle of 0.5-0.6 degrees, so that the large flange bolts produced have excellent self-locking properties, far exceeding national standards, international standards and German standards.

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: A cold heading die for large flange bolts includes a male die assembly and a female die assembly; The male mold assembly includes a male mold shell, with a first through hole penetrating the front and rear surfaces of the male mold shell. A first pad is provided inside the front end of the male mold shell, and a hexagonal punch is connected to the rear surface of the first pad. A male mold core is provided inside the rear end of the male mold shell. The hexagonal punch is inserted into the male mold core to stamp and form the head of the large flange bolt. The female mold assembly includes a female mold shell, with a second through hole penetrating its front and rear surfaces. A molding module is located inside the front end of the female mold shell, and a third through hole is penetrating its front and rear surfaces. A female mold core is located inside the third through hole. A first forming hole is penetrating its front and rear surfaces. The periphery of the first forming hole is inclined to form a bearing surface with an inclination angle of 0.5-0.6 degrees. A large flange bolt-shaped flange is stamped between the male mold core and the female mold core. It also includes a second pad, which is located inside the rear end of the female mold shell and is connected to the molding module and the female mold core; It also includes an ejector pin, which passes through the second pad and inserts into the female mold core, with a punch pressing against the tail of the ejector pin.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the inner wall of the first through hole has a protruding annular first locking block, which is located between the first pad block and the male mold core.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme, it also includes a male mold bushing, the male mold bushing abuts against the first locking block, the male mold core presses against the male mold bushing for fixation, and a hexagonal punch passes through the male mold bushing.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: a second locking block protrudes from the front edge of the second through hole of the female mold shell; the front outer surface of the molding module is recessed to form a staggered first step, and the first step and the second locking block are stacked and fixed together.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a tail pad, which is connected to the female mold shell and the second pad; the tail pad and the second pad are misaligned to form a block; the tail of the ejector pin is placed inside the tail pad.

[0011] A type of large flange bolt, manufactured using a cold heading die; the flange bottom surface of the large flange bolt has an inclination angle of 0-0.6 degrees. The outstanding and beneficial technical effects of this utility model compared to the prior art are: Compared with existing technologies, this utility model of a cold heading die for large flange bolts features a female mold core within the female mold shell. The first forming hole of the female mold core has an inclined bearing surface around it, with an inclination angle of 0.5-0.6 degrees. This design gives the flange of the large flange bolt a 0-0.6 degree angle, resulting in high self-locking performance, exceeding standard specifications.

[0012] This solves the problem of traditional bolts having a large bearing face angle and poor self-locking performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the molding structure of this utility model.

[0014] Figure 2 yes Figure 1 Enlarged schematic diagram of the bearing structure at point A.

[0015] Figure 3 This is a schematic diagram of the large flange bolt structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the flange bolt bearing face angle structure of this utility model.

[0017] Reference numerals: Male mold assembly 1; Male mold shell 10; First through hole 100; First locking block 101; First pad block 11; Hexagonal punch 12; Male mold core 13; Male mold bushing 14; Female mold assembly 2; Female mold shell 20; Second locking block 200; Molding module 21; First step 210; Female mold core 22; Bearing surface 220; Second pad block 23; Ejector pin 24; Punch bar 25; Tail washer 26; Large flange bolt 3; Flange 30. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments; This embodiment provides a cold heading die for large flange bolts, including a male die group 1 and a female die group 2; the male die group 1 is a moving die that moves with the table.

[0019] The male mold assembly 1 includes a male mold shell 10, with a first through hole 100 penetrating the front and rear surfaces of the male mold shell 10. The male mold shell 10 is located on the outermost layer. A first pad 11 is provided inside the front end of the male mold shell 10 for support. A hexagonal punch 12 is connected to the rear surface of the first pad 11 for punching the head of the large flange bolt 3 to form a hexagon. A male mold core 13 is provided inside the rear end of the male mold shell 10 for punching the large flange bolt 3. The hexagonal punch 12 is inserted into the male mold core 13 to punch the head of the large flange bolt 3. The female mold assembly 2 includes a female mold shell 20, with a second through hole penetrating its front and rear surfaces. The female mold shell 20 is opposite to the male mold shell 10 and is also located on the outermost layer. A molding module 21 is provided inside the front end of the female mold shell 20. A third through hole is penetrating its front and rear surfaces, and the molding is used for filling. A female mold core 22 is provided inside the third through hole. A first forming hole is penetrating its front and rear surfaces. The periphery of the first forming hole is inclined to form a bearing surface 220 with an inclination angle of 0.5-0.6 degrees. The female mold core 22 is positioned opposite to the male mold core 13. The female mold core 22 is used for forming the inclination angle of the bearing surface 220 of the large flange bolt 3 to meet the design requirements.

[0020] A large flange bolt 30 is stamped between the male mold core 13 and the female mold core 22; It also includes a second pad 23, which is located inside the rear end of the female mold shell 20. The second pad 23 is connected to the molding module 21 and the female mold core 22. The second pad 23 fills the interior of the female mold shell 20 and plays a fixing role. It also includes an ejector pin 24, which passes through the second pad 23 and inserts into the female mold core 22. The tail of the ejector pin 24 presses against a punch 25. The punch 25 pushes the ejector pin 24 forward, pushing out the large flange bolt 3 for material removal.

[0021] As described above, in the specific molding process, the bolt of the previous mold is inserted into the female mold core 22, the male mold assembly 1 moves towards it, the hexagonal ejector pin 24 and the male mold core 13 punch the large flange bolt 3, and the bearing surface 220 of the large flange bolt 3 is formed on the female mold core 22 with an inclination angle of less than or equal to 0.6 degrees; it can be seen from the following formula: F=MA / (0.159*P+Utot*(0.577*d2+0.5DKm)); Where F: clamping force; MA: tightening torque; P: pitch; Utot: total coefficient of friction.

[0022] d2: Bolt pitch diameter. Dkm: Equivalent diameter of the friction surface (diameter of the contact surface).

[0023] "If the tightening torque is too small, and the clamping force is the same, then the total friction coefficient is too large or the contact area is too large." In order to ensure that the tightening torque is consistent, it is necessary to ensure that the total friction coefficient and the contact area are consistent, and the deviation should not be too large. Therefore, this utility model uses stable cold heading mold processing to compress the bearing surface 220° angle to a relatively small range.

[0024] Large flange bolts 3 are used in modern automated assembly lines to reduce torque alarms and improve drive shaft product quality and assembly efficiency.

[0025] Furthermore, the inner wall of the first through hole 100 has a protruding annular first locking block 101, which is located between the first pad block 11 and the male mold core 13.

[0026] As described above, the first locking block 101 is integrally formed on the male mold shell 10. The first locking block 101 is used to restrict the first pad block 11 and the male mold core 13 on both sides; it also guides and limits the hexagonal punch 12. Furthermore, it also includes a male mold bushing 14, which abuts against the first locking block 101, and the male mold core 13 presses against the male mold bushing 14 for fixation, with the hexagonal punch 12 passing through the male mold bushing 14.

[0027] As described above, the male mold bushing 14 abuts against the first locking block 101 and the male mold core 13 as a buffer to prevent the male mold core 13 from directly impacting the first locking block 101, thus achieving a shock absorption effect. Furthermore, a second locking block 200 protrudes from the front edge of the second through hole of the female mold shell 20; the front outer surface of the punching module 21 is recessed to form a staggered first step 210, and the first step 210 and the second locking block 200 are stacked and fixed together.

[0028] As described above, the female mold shell 20 and the molding module 21 are stacked in a staggered manner to prevent them from coming apart and separating forward.

[0029] Furthermore, it also includes a tail pad 26, which is connected to the female mold shell 20 and the second pad 23; the tail pad 26 and the second pad 23 are misaligned to form a block; the tail of the ejector pin 24 is placed inside the tail pad 26.

[0030] As described above, the tail pad 26 is used to support the whole, while the ejector pin 24 is placed inside it, which has the effect of protection and guidance.

[0031] Using the mold described above, the bottom surface of the flange for preparing large flange bolts has an inclination angle of 0-0.6 degrees.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection. The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A cold heading die for large flange bolts, characterized in that: Includes positive and negative modules; The male mold assembly includes a male mold shell, with a first through hole penetrating the front and rear surfaces of the male mold shell. A first pad is provided inside the front end of the male mold shell, and a hexagonal punch is connected to the rear surface of the first pad. A male mold core is provided inside the rear end of the male mold shell. The hexagonal punch is inserted into the male mold core to stamp and form the head of the large flange bolt. The female mold assembly includes a female mold shell, with a second through hole penetrating its front and rear surfaces. A molding module is located inside the front end of the female mold shell, and a third through hole is penetrating its front and rear surfaces. A female mold core is located inside the third through hole. A first forming hole is penetrating its front and rear surfaces. The periphery of the first forming hole is inclined to form a bearing surface with an inclination angle of 0.5-0.6 degrees. A large flange bolt-shaped flange is stamped between the male mold core and the female mold core. It also includes a second pad, which is located inside the rear end of the female mold shell and is connected to the molding module and the female mold core; It also includes an ejector pin, which passes through the second pad and inserts into the female mold core, with a punch pressing against the tail of the ejector pin.

2. The cold heading die for large flange bolts according to claim 1, characterized in that: The inner wall of the first through hole has a protruding annular first locking block, which is located between the first pad and the male mold core.

3. The cold heading die for large flange bolts according to claim 2, characterized in that: It also includes a male mold bushing, which abuts against the first locking block, and the male mold core presses against the male mold bushing for fixation, with a hexagonal punch passing through the male mold bushing.

4. The cold heading die for large flange bolts according to claim 1, characterized in that: The front edge of the second through hole of the female mold shell has a second locking block protruding; the front outer surface of the molding module is recessed to form a staggered first step, and the first step and the second locking block are stacked and fixed together.

5. The cold heading die for large flange bolts according to claim 4, characterized in that: It also includes a tail pad, which is connected to the female mold shell and the second pad; the tail pad and the second pad are misaligned to form a block; the tail of the ejector pin is placed inside the tail pad.

6. A large flange bolt, characterized in that: The large flange bolts are manufactured using the cold heading mold described in any one of requirements 1-5; the flange bottom surface of the large flange bolts has an inclination angle of 0-0.6 degrees.

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