Straightening-free long bolt production module

Abstract

The utility model belongs to bolt mould technical field, concretely relates to a straightening-free long bolt production module. Its in the cold upsetting forming process, long bolt will not produce the phenomenon of bending in the cold upsetting forming mould cavity, cancels the straightening step, saves the cost, improves the product quality. One mould core includes one mould tail end, one mould middle end and one mould front end, three adjacent splices, the aperture of one mould tail end is X, the aperture of one mould middle end is X + 0.01, the aperture of one mould front end is X + 0.02, two mould core includes two mould tail end, two mould middle end and two mould front end, three adjacent splices, the aperture of two mould tail end is X + 0.02, the aperture of two mould middle end is X + 0.03, the aperture of two mould front end is X + 0.04, three mould core includes three mould tail end, three mould middle end and three mould front end, three adjacent splices, the aperture of three mould tail end is X + 0.04, one mould middle end's aperture is X + 0.05, one mould front end's aperture is X + 0.06, and the rod portion of long bolt is successively cold upset and is formed through one mould core, two mould core and three mould core.

Description

Technical Field

[0001] This utility model belongs to the field of bolt mold technology, specifically relating to a production module for long bolts that does not require straightening. Background Technology

[0002] For long bolts, slight bending may occur after cold heading. After heat treatment quenching and tempering, the bending degree of the product will increase, resulting in the straightness of the long bolts being unqualified. Therefore, straightening is required after heat treatment.

[0003] The current straightening methods for this type of product in the industry all involve using specialized equipment or installing straightening rollers on a thread rolling machine. This is costly and inefficient. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a production module for long bolts that does not require straightening. During the cold heading process, the long bolts will not bend in the cold heading mold cavity, eliminating the straightening step, saving costs, and improving product quality.

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: A production module for long bolts that does not require straightening includes a first mold core, a second mold core, and a third mold core; The mold core consists of a tail end, a middle end, and a front end, which are three adjacent parts spliced ​​together; the aperture of the tail end is X, the aperture of the middle end is X+0.01, and the aperture of the front end is X+0.02. The second mold core consists of three adjacent parts: the tail end, the middle end, and the front end. The aperture of the tail end is X+0.02, the aperture of the middle end is X+0.03, and the aperture of the front end is X+0.04. The three-mold core consists of a tail end, a middle end, and a front end, which are three adjacent parts spliced ​​together. The aperture of the tail end is X+0.04, the aperture of the middle end is X+0.05, and the aperture of the front end is X+0.06. The shank of the long bolt is cold-forged sequentially through a first mold core, a second mold core, and a third mold core.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: it further includes a mold shell, a die is inserted and fixed inside the front end of the mold shell, a mold core is embedded and fixed inside the die, a mold pad is connected to the rear surface of the die, and a mold tail pad is connected to the rear surface of the mold pad; a mold ejector pin passes through the mold tail pad and the mold pad and is inserted into the mold core.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a second mold shell, the front end of which is fixed with a female mold, and a forming hole is opened in the middle of the female mold; the rear surface of the female mold is connected to the second mold core. The front end of the inner cavity of the second mold shell is fixed with a second mold core, which is embedded and fixed inside the second mold. The rear surface of the second mold is connected to a second mold pad, and the rear surface of the second mold pad is connected to a second mold tail pad. The second mold ejector pin passes through the second mold tail pad and the second mold pad and is inserted into the second mold core.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a three-mold shell, a three-mold die is inserted and fixed inside the front end of the three-mold shell, a three-mold core is embedded and fixed inside the three-mold die, a three-mold pad is connected to the rear surface of the three-mold die, and a positioning pad is connected to the rear surface of the three-mold pad; a positioning screw hole is opened on the positioning pad; a bolt passes through the three-mold shell and is screwed into the positioning screw hole for fixation; a three-mold ejector pin passes through the three-mold tail pad and the three-mold pad and is inserted into the three-mold core.

[0009] Based on the above scheme and as a preferred option, both the front end of the second-mode and the front end of the third-mode have 160-degree openings along their aperture edges.

[0010] The outstanding and beneficial technical effects of this utility model compared to the prior art are: Compared with the prior art, the production module for straight long bolts without straightening of this utility model has the following characteristics: the hole diameter at the tail end of the first mold is X, the hole diameter at the middle end of the first mold is X+0.01, and the hole diameter at the front end of the first mold is X+0.02; the hole diameter at the tail end of the second mold is X+0.02, the hole diameter at the middle end of the second mold is X+0.03, and the hole diameter at the front end of the second mold is X+0.04; the hole diameter at the tail end of the third mold is X+0.04, the hole diameter at the middle end of the first mold is X+0.05, and the hole diameter at the front end of the first mold is X+0.06. By employing appropriate die differentials, the three die cores are rationally divided into three parts, with different hole diameters selected for each part, progressing from small to large. While ensuring customer dimensional requirements are met, the appropriate wire diameter is chosen to ensure the product can smoothly enter the next die during cold heading. This prevents bending during cold heading, guaranteeing the product's mechanical properties, dimensions, and straightness meet specifications.

[0011] This solved the problem of bending and deformation of long bolts in actual production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the mold core structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the two-mold core structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the three-mold core structure of this utility model.

[0015] Figure 4 This is a schematic diagram of the long bolt structure of this utility model.

[0016] Figure 5 This is a schematic diagram of the mold structure of this utility model.

[0017] Figure 6 This is a schematic diagram of the two-mold structure of this utility model.

[0018] Figure 7 This is a schematic diagram of the three-mold structure of this utility model.

[0019] Figure reference numerals: Mold core 1; Mold tail end 10; Mold middle end 11; Mold front end 12; Mold core 2; Mold tail end 20; Mold middle end 21; Mold front end 22; Mold core 3; Mold tail end 30; Mold middle end 31; Mold front end 32; Mold shell 100; Mold 101; Mold pad 102; Mold tail pad 103; Mold ejector pin 104; Mold shell 200; Female mold 201; Mold 202; Mold pad 203; Mold tail pad 204; Mold ejector pin 205; Mold shell 300; Mold 301; Mold pad 302; Positioning pad 303; Positioning screw hole 3030; Mold ejector pin 304. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments; This embodiment provides a production module for straightening long bolts without straightening, including a first mold core 1, a second mold core 2, and a third mold core 3; The mold core 1 includes a mold tail end 10, a mold middle end 11, and a mold front end 12, which are three adjacent parts spliced ​​together; the aperture of the mold tail end 10 is X, the aperture of the mold middle end 11 is X+0.01, and the aperture of the mold front end 12 is X+0.02. The mold core 1 is divided into 3 parts, and different parts use different hole diameters, from small to large. While ensuring the customer's size requirements, by selecting the appropriate wire diameter, the hole diameter of the tail end 10 of the mold is set as X (standard wire diameter + 0.02), the middle end 11 of the mold is set as X + 0.01, and the front end 12 of the mold is set as X + 0.02; for example, X is 5 mm, 10 mm or 30 mm.

[0021] The second mold core 2 includes a second mold tail end 20, a second mold middle end 21, and a second mold front end 22, which are three adjacent parts spliced ​​together; the aperture of the second mold tail end 20 is X+0.02, the aperture of the second mold middle end 21 is X+0.03, and the aperture of the second mold front end 22 is X+0.04. The three-mold core 3 includes a three-mold tail end 30, a three-mold middle end 31, and a three-mold front end 32, which are three adjacent splices; the aperture of the three-mold tail end 30 is X+0.04, the aperture of the three-mold middle end 11 is X+0.05, and the aperture of the three-mold front end 12 is X+0.06. The shank of the long bolt is cold-forged sequentially through mold core 1, mold core 2, and mold core 3.

[0022] The tail end of the long bolt is inserted into the small-diameter hole, and the front end is inserted into the large-diameter hole. Three cold heading processes are performed to achieve straightening.

[0023] As mentioned above, during cold heading, the mold core is divided into three parts with increasing hole diameters. This increases the frictional force on the long bolts within the mold cavity, preventing them from bending and ensuring that the long bolt products can smoothly enter the next mold. This ensures that the long bolt products will not bend during cold heading.

[0024] The conventional cold heading design concept is to make the first, second, and third molds into a single mold. However, this design does not take into account that the product is relatively long and the front part needs to be larger. Due to the characteristics of the product, the middle and rear parts cannot meet the design size requirements, which will cause the product to bend. Therefore, a straightening process is required in the later process.

[0025] Furthermore, the mold core is made of tungsten steel, and the mold core is divided into 3 parts of equal length.

[0026] Furthermore, it also includes a mold shell 100, a die 101 is inserted and fixed inside the front end of the mold shell 100, a mold core 1 is embedded and fixed inside the die 101, a mold pad 102 is connected to the rear surface of the die 101, and a mold tail pad 103 is connected to the rear surface of the mold pad 102; a mold ejector pin 104 passes through the mold tail pad 103 and the mold pad 102 and is inserted into the mold core 1.

[0027] As described above, the interior of the mold shell 100 is hollow, and the inner wall of the front end of the mold shell 100 has a step protruding. The mold 101 is fixed inside the mold shell 100. The mold pad 102 and the mold tail pad 103 play a supporting and fixing role. The mold ejector pin 104 is used to eject the long bolt and remove it.

[0028] Furthermore, it also includes a second mold shell 200, the front end of which is fixed with a female mold 201, and the middle of the female mold 201 is provided with a forming hole; the rear surface of the female mold 201 is connected to the second mold core 2. The interior of the second mold shell 200 is hollow. The female mold 201 is embedded in the front end of the second mold shell 200 and fixed. The forming hole on the female mold 201 is used for inserting the head of the long bolt to form the shape.

[0029] The mold core 2 and the female mold 201 are interlocked and fixed together; The inner front end of the second mold shell 200 is fitted with a second mold 202, and the second mold core 2 is embedded and fixed inside the second mold 202. The rear surface of the second mold 202 is connected to a second mold pad 203, and the rear surface of the second mold pad 203 is connected to a second mold tail pad 204. The second mold ejector pin 205 passes through the second mold tail pad 204 and the second mold pad 203 and is inserted into the second mold core 2.

[0030] As described above, the inner wall of the front end of the second mold shell 200 has a step protruding, and the second mold 202 is fixed inside the second mold shell 200; the second mold pad 203 and the second mold tail pad 204 play a supporting and fixing role; the second mold ejector pin 205 is used to eject the long bolt and remove it.

[0031] Furthermore, it also includes a three-mold housing 300, with a three-mold 301 inserted and fixed inside the front end of the three-mold housing 300. A three-mold core 3 is embedded and fixed inside the three-mold 301. A three-mold pad 302 is connected to the rear surface of the three-mold 301, and a positioning pad 303 is connected to the rear surface of the three-mold pad 302. A positioning screw hole 3030 is opened on the positioning pad 303. A bolt passes through the three-mold housing 300 and is screwed into the positioning screw hole 3030 for fixation. A three-mold ejector pin 304 passes through the three-mold tail pad and the three-mold pad 302 and is inserted into the three-mold core 3.

[0032] As mentioned above, The inner wall of the front end of the three-mold housing 300 has a step protrusion. The three-mold 301 is snapped into the three-mold housing 300 for fixation. The three-mold pad 302 and the three-mold tail pad provide support and fixation. The three-mold housing 300 and the positioning pad 303 are fixed by bolts. The three-mold ejector pin 304 is used to eject the long bolts and detach them.

[0033] Furthermore, both the front end 22 of the second-mode and the front end 32 of the third-mode have 160-degree openings along their aperture edges.

[0034] As described above, the 160-degree opening is used to fit the curved bottom surface of the head of the long bolt, forming a platform.

[0035] 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.

[0036] 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 production module for long bolts that does not require straightening, characterized in that: Including first-stage mold cores, second-stage mold cores, and third-stage mold cores; The mold core consists of a tail end, a middle end, and a front end, which are three adjacent parts spliced ​​together; the aperture of the tail end is X, the aperture of the middle end is X+0.01, and the aperture of the front end is X+0.

02. The second mold core consists of three adjacent parts: the tail end, the middle end, and the front end. The aperture of the tail end is X+0.02, the aperture of the middle end is X+0.03, and the aperture of the front end is X+0.

04. The three-mold core consists of a tail end, a middle end, and a front end, which are three adjacent parts spliced ​​together. The aperture of the tail end is X+0.04, the aperture of the middle end is X+0.05, and the aperture of the front end is X+0.

06. The shank of the long bolt is cold-forged sequentially through a first mold core, a second mold core, and a third mold core.

2. The production module for straight long bolts without straightening according to claim 1, characterized in that: It also includes a mold shell, a die is inserted and fixed inside the front end of the mold shell, a mold core is embedded and fixed inside the die, a mold pad is connected to the rear surface of the die, and a mold tail pad is connected to the rear surface of the mold pad; a mold ejector pin passes through the mold tail pad and the mold pad and is inserted into the mold core.

3. The production module for straight long bolts without straightening according to claim 1, characterized in that: It also includes a second mold shell, with a female mold fixed to the front end of the second mold shell, and a forming hole opened in the middle of the female mold; the rear surface of the female mold is connected to the second mold core. The front end of the inner cavity of the second mold shell is fixed with a second mold core, which is embedded and fixed inside the second mold. The rear surface of the second mold is connected to a second mold pad, and the rear surface of the second mold pad is connected to a second mold tail pad. The second mold ejector pin passes through the second mold tail pad and the second mold pad and is inserted into the second mold core.

4. The production module for straight long bolts without straightening according to claim 1, characterized in that: It also includes a three-mold housing, with a three-mold die inserted and fixed at the front end of the housing, and a three-mold core embedded and fixed inside the die. A three-mold pad is connected to the rear surface of the die, and a positioning pad is connected to the rear surface of the pad. A positioning screw hole is provided on the positioning pad. A bolt passes through the three-mold housing and is screwed into the positioning screw hole for fixation. A three-mold ejector pin passes through the tail pad and the pad and is inserted into the core.

5. The production module for straight long bolts without straightening according to claim 1, characterized in that: Both the front end of the second-mode and the front end of the third-mode have 160-degree openings along their aperture edges.

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