A precision positioning bolt cold header

Abstract

This utility model relates to the field of bolt processing technology and discloses a precision-positioning bolt cold heading machine, including a base, a top plate, a fixed mold base, a stamping mold base, and a hydraulic cylinder; two symmetrically arranged support columns are fixedly connected between the base and the top plate, and a wear-resistant alloy layer is fixedly connected to one side of each support column. A sliding plate is slidably connected to the surface of both support columns. Each support column has multiple threaded holes on one side, and a lead screw is threaded into the inner cavity of each threaded hole. A ball is embedded in the inner cavity of the lead screw, and a compression spring is provided between the ball and the lead screw. A hexagonal hole is opened at one end of the lead screw, and sliding grooves adapted to the ball are opened on both sides of the sliding plate; a lubrication structure for lubricating the sliding plate and the ball is provided on one side of the support column. The wear resistance is enhanced through multiple structural designs, and the wear-resistant alloy layer can directly reduce the contact wear when the sliding plate slides; the rolling cooperation between the ball and the sliding groove can significantly reduce friction loss in high-frequency relative motion.

Description

Technical Field

[0001] This utility model relates to the field of bolt processing technology, specifically a bolt cold heading machine with precise positioning. Background Technology

[0002] Bolts are common fasteners widely used in machinery, vehicle manufacturing, construction, and many other fields. Bolts typically consist of a shank and a nut, used to connect two or more parts together. A bolt cold heading machine is a device used to produce bolts, particularly suitable for bolt manufacturing forming processes. Cold heading is a process that directly shapes materials through cold working without heat treatment. This method can improve the mechanical properties of materials, reduce surface roughness, and has lower production costs and higher production efficiency. Compared with traditional hot heading or machining methods, cold-headed bolts have higher production efficiency and lower costs, and are widely used in the mass production of fasteners.

[0003] Chinese patent publication (publication number: CN214108655U) discloses a bolt cold heading machine with a precise positioning structure, including a base and a fixed mold base. The base has a fixed seat at the top center and a snap-fit ​​plate is arranged around the outside of the fixed seat. A telescopic rod is connected to the inside of the fixed seat and a shock-absorbing spring is arranged on the outside of the telescopic rod. The fixed mold base is placed on the top of the telescopic rod.

[0004] In the aforementioned comparative documents, to prevent the stamping die holder from tilting during its up-and-down movement, a structure of sliding block and slide groove is usually adopted (such as opening a second slide groove on the support column and setting sliding blocks on both sides of the sliding seat connected to the stamping die holder). The movement path of the stamping die holder is constrained by the sliding of the sliding block along the slide groove, thereby achieving preliminary positioning.

[0005] However, the above-mentioned guide positioning structure has obvious defects: the contact surface between the sliding block and the slide groove is in a high-frequency relative sliding state for a long time. Since the prior art does not carry out targeted wear-resistant treatment on the sliding parts, as the usage time increases, the contact surface between the sliding block and the slide groove is prone to wear due to friction, which leads to the gradual increase of the fit gap between the two. This increase in gap directly destroys the original guiding accuracy, making the stamping die base prone to slight displacement or shaking during the movement, which in turn leads to the alignment deviation between the stamping part and the cold heading hole on the fixed die base.

[0006] In view of this, the present invention solves the above-mentioned technical problems by proposing a bolt cold heading machine with precise positioning. Utility Model Content

[0007] To address the shortcomings of the aforementioned background technology, this utility model provides a technical solution for a precision-positioning bolt cold heading machine. Firstly, it enhances wear resistance through multiple structural designs: a high-manganese steel wear-resistant alloy layer is installed on one side of the support column, directly reducing contact wear during sliding of the sliding plate; the rolling engagement of the balls and sliding groove replaces traditional sliding friction, significantly reducing frictional losses in high-frequency relative motion and minimizing the problem of increased clearance due to wear. Secondly, the engagement structure of the screw, balls, compression spring, and hexagonal hole enables clearance compensation: when the balls or sliding groove show slight wear due to long-term use, a hexagonal wrench connected to the hexagonal hole rotates the screw. The extension length of the lead screw in the threaded hole can be adjusted. Combined with the elastic force of the compression spring on the ball, the fit between the ball and the sliding groove can be tightened again, effectively compensating for the gap caused by wear. This ensures that the sliding plate always moves in a precise straight line along the support column, avoiding slight deviations or wobbling of the stamping die. Finally, the lubrication structure (lubrication channel, lead screw through hole, sealing knob) can deliver lubricant in a directional manner: after opening the sealing knob, the lubricant enters the contact area between the ball and the sliding groove through the lubrication channel and through hole, which can significantly reduce the rolling friction coefficient and reduce component wear. At the same time, the sealing knob can prevent lubricant leakage, ensure long-term lubrication effect, and further extend the service life of the components.

[0008] This utility model provides the following technical solution: a precision-positioning bolt cold heading machine, comprising a base, a top plate, a fixed mold base, a stamping mold base, and a hydraulic cylinder;

[0009] Two symmetrically arranged support columns are fixedly connected between the base and the top plate. A wear-resistant alloy layer is fixedly connected to one side of each support column. A sliding plate is slidably connected to the surface of both support columns. Each support column has multiple threaded holes on one side. A lead screw is threaded into the inner cavity of each threaded hole. A ball is embedded in the inner cavity of the lead screw. A compression spring is provided between the ball and the lead screw. A hexagonal hole is opened at one end of the lead screw. Sliding grooves that are adapted to the ball are opened on both sides of the sliding plate.

[0010] One side of the support column is provided with a lubrication structure for lubricating the sliding plate and the ball bearings.

[0011] As a preferred embodiment of this utility model, the lubrication structure includes a lubrication channel opened on one side of the support column, a through hole opened on the surface of the lead screw, the lubrication channel communicating with the through hole, and a sealing knob threadedly connected to the inner cavity of the lubrication channel.

[0012] As a preferred embodiment of this utility model, the surface of the sealing knob may be provided with anti-slip texture, and the anti-slip texture is a concave structure.

[0013] In a preferred embodiment of this invention, the wear-resistant alloy layer is a high-manganese steel wear-resistant alloy layer, and the wear-resistant alloy layer is fixedly connected to the support column by arc welding.

[0014] In a preferred embodiment of this utility model, the hydraulic cylinder is fixedly connected to the top of the top plate, and one end of the hydraulic cylinder telescopic rod is bolted to the top of the sliding plate.

[0015] In a preferred embodiment of this utility model, the fixed mold base is fixedly connected to the top of the base, and the stamping mold base is fixedly connected to the bottom of the top plate.

[0016] As a preferred embodiment of this utility model, the ball is a bearing steel ball, and the surface of the ball is subjected to quenching treatment.

[0017] As a preferred embodiment of this utility model, the sliding plate is a 45# steel sliding plate, and the surface of the sliding plate is nitrided.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In view of the wear problem caused by the lack of wear-resistant treatment of sliding block and sliding groove in the prior art, this utility model enhances wear resistance through multiple structural designs: a high manganese steel wear-resistant alloy layer is set on one side of the support column, which can directly reduce the contact wear when the sliding plate slides; the rolling cooperation between the ball and the sliding groove replaces the traditional sliding friction, which can significantly reduce friction loss in high-frequency relative motion and reduce the problem of increased fit clearance caused by wear.

[0020] 2. This utility model achieves clearance compensation through the cooperative structure of lead screw, ball bearing, compression spring and hexagonal hole: when the ball bearing or sliding groove is slightly worn due to long-term use, the lead screw can be rotated by connecting a hexagonal wrench through the hexagonal hole to adjust the extension length of the lead screw in the threaded hole. Combined with the elastic force of the compression spring on the ball bearing, the fit between the ball bearing and the sliding groove can be tightened again, effectively compensating for the clearance caused by wear, ensuring that the sliding plate always moves in a precise straight line along the support column, and avoiding slight deviation or shaking of the stamping die seat.

[0021] 3. The lubrication structure of this utility model (lubrication channel, lead screw through hole, sealing knob) can deliver lubricant in a directional manner: after the sealing knob is opened, the lubricant enters the contact area between the ball and the sliding groove through the lubrication channel and through hole, which can significantly reduce the rolling friction coefficient and reduce component wear; at the same time, the sealing knob can prevent lubricant leakage, ensure long-term lubrication effect, and further extend the service life of the components. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a cross-sectional view of the present invention;

[0025] Figure 4 This is a schematic diagram of the lead screw structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the sliding plate structure of this utility model.

[0027] In the diagram: 1. Base; 101. Top plate; 102. Fixed mold base; 103. Stamping mold base; 104. Hydraulic cylinder; 2. Support column; 201. Wear-resistant alloy layer; 202. Sliding plate; 203. Threaded hole; 204. Lead screw; 205. Ball bearing; 206. Compression spring; 207. Hexagonal hole; 208. Sliding groove; 3. Lubrication channel; 301. Through hole; 302. Sealing knob. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-5 As shown, a precision-positioning bolt cold heading machine includes a base 1, a top plate 101, a fixed mold base 102, a stamping mold base 103, and a hydraulic cylinder 104.

[0030] Two symmetrically arranged support columns 2 are fixedly connected between the base 1 and the top plate 101. A wear-resistant alloy layer 201 is fixedly connected to one side of the support column 2. A sliding plate 202 is slidably connected to the surface of the two support columns 2. Multiple threaded holes 203 are provided on one side of each support column 2. A lead screw 204 is threadedly connected to the inner cavity of each threaded hole 203. A ball 205 is embedded in the inner cavity of the lead screw 204. A compression spring 206 is provided between the ball 205 and the lead screw 204. A hexagonal hole 207 is opened at one end of the lead screw 204. Sliding grooves 208 that are adapted to the ball 205 are opened on both sides of the sliding plate 202.

[0031] A lubrication structure for lubricating the sliding plate 202 and the ball bearing 205 is provided on one side of the support column 2;

[0032] The lubrication structure includes a lubrication channel 3 opened on one side of the support column 2, a through hole 301 opened on the surface of the lead screw 204, the lubrication channel 3 communicates with the through hole 301, and a sealing knob 302 is threadedly connected to the inner cavity of the lubrication channel 3.

[0033] The surface of the sealing knob 302 may be provided with anti-slip texture, which is a concave structure;

[0034] The wear-resistant alloy layer 201 is a high-manganese steel wear-resistant alloy layer, and the wear-resistant alloy layer 201 is fixedly connected to the support column 2 by arc welding.

[0035] The hydraulic cylinder 104 is fixedly connected to the top of the top plate 101, and one end of the extension rod of the hydraulic cylinder 104 is bolted to the top end of the sliding plate 202.

[0036] The fixed mold base 102 is fixedly connected to the top of the base 1, and the stamping mold base 103 is fixedly connected to the bottom of the top plate 101;

[0037] Ball 205 is a bearing steel ball, and the surface of ball 205 is hardened.

[0038] The sliding plate 202 is made of 45# steel and its surface is nitrided.

[0039] During the cold heading process of bolts, the hydraulic cylinder 104 acts as a power source to drive the sliding plate 202 to slide up and down along the support column 2, thereby driving the stamping die base 103 associated with the sliding plate 202 to move synchronously, so as to realize the cold heading stamping of the workpiece on the fixed die base 102.

[0040] The sliding guide and positioning accuracy of the sliding plate 202 are ensured by the following structure: the wear-resistant alloy layer 201 on one side of the support column 2 can reduce the direct wear of the sliding plate 202 during sliding; at the same time, the lead screw 204 on the support column 2 is fixed by the threaded hole 203, and the ball 205 in its inner cavity is embedded in the sliding groove 208 on both sides of the sliding plate 202 under the elastic force of the compression spring 206, forming a rolling guide fit. The contact between the ball 205 and the sliding groove 208 can limit the offset of the sliding plate 202, ensure its linear movement accuracy along the support column 2, and avoid the stamping die base 103 tilting during the cold heading process;

[0041] When long-term use causes slight wear on the ball 205 or sliding groove 208 and an increase in the clearance, a hexagonal wrench can be connected to the hexagonal hole 207 to rotate the lead screw 204, adjust the extension length of the lead screw 204 in the threaded hole 203, thereby changing the degree of pressure of the ball 205 on the sliding groove 208, compensating for the wear clearance, and maintaining positioning accuracy.

[0042] The lubrication structure reduces wear in the following ways: After the sealing knob 302 is turned on, the lubricant can enter the inner cavity of the lead screw 204 through the lubrication channel 3 and the through hole 301 on the surface of the lead screw 204. Then, through the rotation of the ball 205, the lubricant is carried into the contact area between the ball 205 and the sliding groove 208, reducing rolling friction. The concave anti-slip texture of the sealing knob 302 facilitates operation and prevents lubricant leakage.

[0043] In addition, the arc welding of bearing steel ball bearings 205 that have been quenched, sliding plate 202 made of No. 45 steel that has been nitrided, and high manganese steel wear-resistant alloy layer 201 further improves the wear resistance of key components, ensures long-term stable operation of equipment, and ultimately achieves precise positioning processing of bolt cold forging.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision-positioning bolt cold heading machine, comprising: The base (1), top plate (101), fixed mold base (102), stamping mold base (103) and hydraulic cylinder (104); The feature is that: two symmetrically arranged support columns (2) are fixedly connected between the base (1) and the top plate (101), a wear-resistant alloy layer (201) is fixedly connected to one side of the support column (2), a sliding plate (202) is slidably connected to the surfaces of the two support columns (2), a plurality of threaded holes (203) are provided on one side of each support column (2), a lead screw (204) is threadedly connected to the inner cavity of each threaded hole (203), a ball (205) is embedded in the inner cavity of the lead screw (204), a compression spring (206) is provided between the ball (205) and the lead screw (204), a hexagonal hole (207) is opened at one end of the lead screw (204), and sliding grooves (208) adapted to the ball (205) are opened on both sides of the sliding plate (202); One side of the support column (2) is provided with a lubrication structure for lubricating the sliding plate (202) and the ball (205).

2. The bolt cold heading machine for precise positioning according to claim 1, characterized in that: The lubrication structure includes a lubrication channel (3) opened on one side of the support column (2), and a through hole (301) is opened on the surface of the lead screw (204). The lubrication channel (3) is connected to the through hole (301), and a sealing knob (302) is threadedly connected to the inner cavity of the lubrication channel (3).

3. The precision positioning bolt cold heading machine according to claim 2, characterized in that: The surface of the sealing knob (302) may be provided with anti-slip texture, which is a concave structure.

4. The precision-positioning bolt cold heading machine according to claim 1, characterized in that: The wear-resistant alloy layer (201) is a high manganese steel wear-resistant alloy layer, and the wear-resistant alloy layer (201) is fixedly connected to the support column (2) by arc welding.

5. A precision-positioning bolt cold heading machine according to claim 1, characterized in that: The hydraulic cylinder (104) is fixedly connected to the top of the top plate (101), and one end of the extension rod of the hydraulic cylinder (104) is bolted to the top end of the sliding plate (202).

6. A precision-positioning bolt cold heading machine according to claim 1, characterized in that: The fixed mold base (102) is fixedly connected to the top of the base (1), and the stamping mold base (103) is fixedly connected to the bottom of the top plate (101).

7. A precision-positioning bolt cold heading machine according to claim 1, characterized in that: The ball (205) is a bearing steel ball, and the surface of the ball (205) is hardened.

8. A precision-positioning bolt cold heading machine according to claim 1, characterized in that: The sliding plate (202) is a 45# steel sliding plate, and the surface of the sliding plate (202) is nitrided.

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