High-precision chain sleeve cold heading drilling device

Abstract

The utility model relates to the technical field of chain machining, in particular to a high-precision chain sleeve cold heading drilling device which comprises a fixed die, an inner cavity is formed in the surface of the fixed die, and an upper punching rod set is arranged above the fixed die. A first upper punching rod, a second upper punching rod, a third upper punching rod, a fourth upper punching rod and a stretching head are arranged in the upper punching rod set, a drill bit is arranged on one side of the upper punching rod set, and a lower punching rod set is arranged below the fixed die and composed of a first lower punching rod, a second lower punching rod, a third lower punching rod, a fourth lower punching rod and a fifth lower punching rod. Buffering mechanisms are arranged on the surfaces of the upper punching rod set and the lower punching rod set, and a sleeve body is arranged on one side of the fixed die. According to the cold heading drilling device, the machining error during use is reduced, the precision of the sleeve main body is improved, the working efficiency is high, solid materials are adopted for machining, and the problem that connector gaps are generated during coiled material machining is solved.

Description

Technical Field

[0001] This utility model relates to the field of chain processing technology, specifically a high-precision cold heading drilling device for chain sleeves. Background Technology

[0002] Pins and sleeves on conveyor chains typically require milling of the outer surface (commonly known as milling flat) and drilling after machining the outer diameter.

[0003] Chain bushings are often made of coiled material, which can easily create gaps at the joints. Therefore, the cold heading drilling method for chain bushings has emerged. Cold heading refers to the forging process performed below the recrystallization temperature of the material.

[0004] When cold heading with chain sleeves, the steel is usually forged by impacting the punch directly with a cylinder. The impact is not easily buffered, which can easily lead to large processing errors when using the cold heading drilling device. Utility Model Content

[0005] The purpose of this utility model is to provide a high-precision cold heading drilling device for chain sleeves, so as to solve the problems mentioned in the background art, which are that the cold heading drilling device is prone to large processing errors during use, and that the use of coil materials for processing is prone to interface gaps.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-precision chain sleeve cold heading drilling device, comprising a fixed mold, an inner cavity formed on the surface of the fixed mold, the central axis of the inner cavity coinciding with the central axis of the fixed mold, an upper punch assembly above the fixed mold, the upper punch assembly including a first upper punch, a second upper punch, a third upper punch, a fourth upper punch and a drawing head, a drill bit made of metal on one side of the upper punch assembly, the central axis of the drill bit coinciding with the central axis of the inner cavity, a lower punch assembly below the fixed mold, the lower punch assembly consisting of a first lower punch, a second lower punch, a third lower punch, a fourth lower punch and a fifth lower punch, a buffer mechanism on the surface of the upper punch assembly and the lower punch assembly, the buffer mechanism including a guide cylinder and a buffer component, and a sleeve body on one side of the fixed mold.

[0007] Preferably, a first upper punch is provided above the fixed mold, a second upper punch is provided on one side of the first upper punch, and a third upper punch is provided on one side of the second upper punch. The central axes of the third upper punch, the second upper punch, and the first upper punch coincide with the central axis of the inner cavity, and the diameter of the bottom of the third upper punch, the second upper punch, and the first upper punch is the same as the diameter of the upper part of the inner cavity.

[0008] Preferably, a fourth upper punch is provided on one side of the third upper punch, and a convex chamfered head is formed on one end face of the fourth upper punch. The central axis of the fourth upper punch coincides with the central axis of the inner cavity, and the diameter of the fourth upper punch is the same as the diameter of the upper part of the inner cavity.

[0009] Preferably, a stretching head is provided on one side of the fourth upper punch, and a chamfered head is formed on one end face of the stretching head, and the central axis of the stretching head coincides with the central axis of the inner cavity.

[0010] Preferably, the first lower punch is disposed below the first upper punch, the second lower punch is disposed below the second upper punch, and a third lower punch is disposed on one side of the second lower punch. The central axis of the third lower punch, the second lower punch, and the first lower punch coincides with the central axis of the inner cavity, and the diameter of the top of the third lower punch, the second lower punch, and the first lower punch is the same as the diameter of the lower part of the inner cavity.

[0011] Preferably, the fourth lower punch is disposed below the fourth upper punch, and a convex chamfered head is formed on one end face of the fourth lower punch. The central axis of the fourth lower punch coincides with the central axis of the inner cavity, and the diameter of the fourth lower punch is the same as the diameter of the lower part of the inner cavity.

[0012] Preferably, the fifth lower punch is positioned below the stretching head, and a convex chamfer is formed on one end face of the fifth lower punch. The diameter of the fifth lower punch is the same as the diameter of the stretching head.

[0013] Preferably, the guide cylinder is slidably sleeved on the outside of the upper punch group and the lower punch group, and a buffer component is provided inside the guide cylinder.

[0014] Preferably, the buffer component consists of a connecting plate and a buffer spring. The connecting plate is fixed to one end of the upper punch group and the lower punch group respectively. The connecting plate and the guide cylinder slide against each other. The buffer spring is sleeved on the outside of the upper punch group and the lower punch group respectively. The two ends of the buffer spring are fixedly connected to the connecting plate and the guide cylinder respectively.

[0015] Preferably, the sleeve body has grooves formed on its upper and lower end faces after cold heading, and the sleeve body has positioning grooves formed on its surface after forging by a drawing head.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the high-precision chain sleeve cold heading drilling device not only reduces the processing error when using the cold heading drilling device and improves the precision of the sleeve body, but also solves the problem of interface gaps caused by the processing of coil materials by using solid materials.

[0017] 1. By setting a buffer mechanism, when the cylinder drives the upper and lower punch groups to cold-forge solid steel, one end of the cylinder can be fixed to the connecting plate, and the guide cylinder can be fixed to the surface of the cold forging machine frame. During cold forging, the cylinder pushes the connecting plate, causing the connecting plate to push the first upper punch downward. At this time, the upper and lower punch groups can be guided by the sliding cooperation between the connecting plate and the guide cylinder. At the same time, the connecting plate squeezes the buffer spring, causing the buffer spring to contract and buffer the cylinder, avoiding excessive impact when the cylinder pushes the upper and lower punch groups, which would affect the forging. This realizes the buffer function of the cold forging drilling device, thereby reducing the processing error when using the cold forging drilling device and improving the accuracy of the sleeve body.

[0018] 2. By setting up a fixed mold, an upper punch group, a drill bit, a lower punch group, and a sleeve body, with upper and lower punch groups respectively on both sides of the fixed mold, during cold heading, the first upper punch and the first lower punch simultaneously cold head the solid steel placed in the inner cavity. After forging, it is taken out and placed in the inner cavity between the second upper punch and the second lower punch, and then forged by the second upper punch and the second lower punch. Subsequently, it passes through the first upper punch, the first lower punch to the drawing head, and the fifth lower punch in sequence to cold head the steel into a sleeve body. Then, the drill bit at the rear of the drawing head drills the positioning groove on the surface of the sleeve body to realize the cold heading drilling function of the cold heading drilling device. Moreover, the use of solid material processing solves the problem of interface gaps caused by coil processing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0021] Figure 3 This is an enlarged cross-sectional view of the main body of the sleeve of this utility model;

[0022] Figure 4 This is an enlarged structural schematic diagram of the buffer mechanism of this utility model.

[0023] In the diagram: 1. Fixed mold; 11. Inner cavity; 2. Upper punch assembly; 21. First upper punch; 22. Second upper punch; 23. Third upper punch; 24. Fourth upper punch; 25. Drawing head; 3. Drill bit; 4. Lower punch assembly; 41. First lower punch; 42. Second lower punch; 43. Third lower punch; 44. Fourth lower punch; 45. Fifth lower punch; 5. Buffer mechanism; 51. Guide cylinder; 52. Buffer component; 521. Connecting plate; 522. Buffer spring; 6. Sleeve body; 61. Groove; 62. Positioning groove. Detailed Implementation

[0024] 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, not all embodiments. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it 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. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] The structure of the high-precision chain sleeve cold heading drilling device provided by this utility model is as follows: Figure 1 and Figure 2 As shown, the device includes a fixed mold 1, with an inner cavity 11 formed on its surface. The central axis of the inner cavity 11 coincides with the central axis of the fixed mold 1. An upper punch assembly 2 is disposed above the fixed mold 1. The upper punch assembly 2 includes a first upper punch 21, a second upper punch 22, a third upper punch 23, a fourth upper punch 24, and a drawing head 25. The first upper punch 21 is disposed above the fixed mold 1. The second upper punch 22 is disposed on one side of the first upper punch 21. The third upper punch 23 is disposed on one side of the second upper punch 22. The central axes of the third upper punch 23, the second upper punch 22, and the first upper punch 21 coincide with the central axis of the inner cavity 11. The central axes of the three upper punches 23, 22 and 21 coincide. The diameters of the bottom of the three upper punches 23, 22 and 21 are the same as the diameter of the upper part of the inner cavity 11. A fourth upper punch 24 is provided on one side of the third upper punch 23. A convex chamfered head is formed on one end face of the fourth upper punch 24. The central axis of the fourth upper punch 24 coincides with the central axis of the inner cavity 11. The diameter of the fourth upper punch 24 is the same as the diameter of the upper part of the inner cavity 11. A stretching head 25 is provided on one side of the fourth upper punch 24. A convex chamfered head is formed on one end face of the stretching head 25. The central axis of the stretching head 25 coincides with the central axis of the inner cavity 11.

[0026] Furthermore, such as Figure 2 As shown, a drill bit 3 is provided on one side of the upper punch assembly 2. The drill bit 3 is made of metal, and the central axis of the drill bit 3 coincides with the central axis of the inner cavity 11.

[0027] Furthermore, such as Figure 2As shown, a lower punch assembly 4 is provided below the fixed mold 1. The lower punch assembly 4 consists of a first lower punch 41, a second lower punch 42, a third lower punch 43, a fourth lower punch 44, and a fifth lower punch 45. The first lower punch 41 is located below the first upper punch 21, and the second lower punch 42 is located below the second upper punch 22. The third lower punch 43 is located on one side of the second lower punch 42. The central axis of the third lower punch 43, the second lower punch 42, and the first lower punch 41 coincides with the central axis of the inner cavity 11. The third lower punch 43, the second lower punch 42, and the first lower punch 41 are arranged below the first upper punch 21. The diameters of the tops of rod 42 and the first lower punch 41 are the same as the diameter of the lower part of the inner cavity 11. The fourth lower punch 44 is located below the fourth upper punch 24. A convex chamfer is formed on one end face of the fourth lower punch 44. The central axis of the fourth lower punch 44 coincides with the central axis of the inner cavity 11. The diameter of the fourth lower punch 44 is the same as the diameter of the lower part of the inner cavity 11. The fifth lower punch 45 is located below the drawing head 25. A convex chamfer is formed on one end face of the fifth lower punch 45. The diameter of the fifth lower punch 45 is the same as the diameter of the drawing head 25.

[0028] In use, with upper punch group 2 and lower punch group 4 respectively provided on both sides of the fixed mold 1, during cold heading, the first upper punch 21 and the first lower punch 41 simultaneously cold head the solid steel placed in the inner cavity 11. After forging, it is taken out and placed in the inner cavity 11 between the second upper punch 22 and the second lower punch 42, and then forged by the second upper punch 22 and the second lower punch 42. Then, in the same way, it passes through the first upper punch 21, the first lower punch 41 to the drawing head 25 and the fifth lower punch 45 in sequence to cold head the steel into the sleeve body 6. Then, the drill bit 3 at the rear of the drawing head 25 drills the positioning groove 62 on the surface of the sleeve body 6 to realize the cold heading drilling function of the cold heading drilling device.

[0029] Furthermore, such as Figure 4 As shown, the surfaces of the upper punch assembly 2 and the lower punch assembly 4 are provided with a buffer mechanism 5. The buffer mechanism 5 includes a guide cylinder 51 and a buffer component 52. The guide cylinder 51 is slidably sleeved on the outside of the upper punch assembly 2 and the lower punch assembly 4 respectively. The buffer component 52 is provided inside the guide cylinder 51. The buffer component 52 is composed of a connecting plate 521 and a buffer spring 522. The connecting plate 521 is fixed to one end of the upper punch assembly 2 and the lower punch assembly 4 respectively. The connecting plate 521 and the guide cylinder 51 slide against each other. The buffer spring 522 is sleeved on the outside of the upper punch assembly 2 and the lower punch assembly 4 respectively. The two ends of the buffer spring 522 are fixedly connected to the connecting plate 521 and the guide cylinder 51 respectively.

[0030] In use, when the cylinder drives the upper punch group 2 and the lower punch group 4 to cold forge solid steel, one end of the cylinder can be fixed to the connecting plate 521, and the guide cylinder 51 can be fixed to the surface of the cold forging machine frame. During cold forging, the cylinder pushes the connecting plate 521, causing the connecting plate 521 to push the first upper punch 21 downward. At this time, the upper punch group 2 and the lower punch group 4 can be guided by the sliding cooperation between the connecting plate 521 and the guide cylinder 51. At the same time, the connecting plate 521 compresses the buffer spring 522, causing the buffer spring 522 to contract and buffer the cylinder, so as to avoid excessive impact when the cylinder pushes the upper punch group 2 and the lower punch group 4, which would affect the forging, thus realizing the buffer function of the cold forging drilling device.

[0031] Furthermore, such as Figure 3 As shown, a sleeve body 6 is provided on one side of the fixed mold 1. After cold heading, grooves 61 are formed on the upper and lower end faces of the sleeve body 6. After being forged by the stretching head 25, a positioning groove 62 is formed on the surface of the sleeve body 6.

[0032] Working principle: In use, firstly, upper punch group 2 and lower punch group 4 are respectively set on both sides of the fixed mold 1. During cold heading, the first upper punch 21 and the first lower punch 41 simultaneously cold head the solid steel placed in the inner cavity 11. After forging, it is taken out and placed in the inner cavity 11 between the second upper punch 22 and the second lower punch 42. It continues to be forged by the second upper punch 22 and the second lower punch 42. Then, in the same way, it passes through the first upper punch 21, the first lower punch 41 to the drawing head 25 and the fifth lower punch 45 in sequence to cold head the steel into the sleeve body 6. Then, the drill bit 3 at the rear of the drawing head 25 drills the positioning groove 62 on the surface of the sleeve body 6 to realize the cold heading drilling function of the cold heading drilling device. Moreover, the solid material is used for processing, which solves the problem of interface gaps caused by coil processing.

[0033] When the cylinder drives the upper punch assembly 2 and the lower punch assembly 4 to cold-forge solid steel, one end of the cylinder can be fixed to the connecting plate 521, and the guide cylinder 51 can be fixed to the surface of the cold forging machine frame. During cold forging, the cylinder pushes the connecting plate 521, causing the connecting plate 521 to push the first upper punch 21 downward. At this time, the upper punch assembly 2 and the lower punch assembly 4 can be guided by the sliding cooperation between the connecting plate 521 and the guide cylinder 51. At the same time, the connecting plate 521 compresses the buffer spring 522, causing the buffer spring 522 to contract and buffer the cylinder, avoiding excessive impact when the cylinder pushes the upper punch assembly 2 and the lower punch assembly 4, which would affect the forging. This realizes the buffer function of the cold forging drilling device, thereby reducing the processing error when using the cold forging drilling device, improving the accuracy of the sleeve body 6, and finally completing the use of the cold forging drilling device.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention 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 invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-precision cold heading drilling device for chain sleeves, comprising a fixed mold (1), characterized in that: The fixed mold (1) has an inner cavity (11) on its surface. The central axis of the inner cavity (11) coincides with the central axis of the fixed mold (1). An upper punch assembly (2) is provided above the fixed mold (1). The upper punch assembly (2) includes a first upper punch (21), a second upper punch (22), a third upper punch (23), a fourth upper punch (24), and a drawing head (25). A drill bit (3) is provided on one side of the upper punch assembly (2). The drill bit (3) is made of metal. The central axis of the drill bit (3) coincides with the central axis of the inner cavity. The central axis of (11) coincides. A lower punch group (4) is provided below the fixed mold (1). The lower punch group (4) consists of a first lower punch (41), a second lower punch (42), a third lower punch (43), a fourth lower punch (44), and a fifth lower punch (45). A buffer mechanism (5) is provided on the surface of the upper punch group (2) and the lower punch group (4). The buffer mechanism (5) includes a guide cylinder (51) and a buffer component (52). A sleeve body (6) is provided on one side of the fixed mold (1).

2. The high-precision cold heading drilling device for chain sleeves according to claim 1, characterized in that: A first upper punch (21) is provided above the fixed mold (1), a second upper punch (22) is provided on one side of the first upper punch (21), and a third upper punch (23) is provided on one side of the second upper punch (22). The central axis of the third upper punch (23), the second upper punch (22) and the first upper punch (21) coincides with the central axis of the inner cavity (11). The diameter of the bottom of the third upper punch (23), the second upper punch (22) and the first upper punch (21) is the same as the diameter of the upper part of the inner cavity (11).

3. The high-precision cold heading drilling device for chain sleeves according to claim 2, characterized in that: A fourth upper punch (24) is provided on one side of the third upper punch (23). A chamfered head is formed on one end face of the fourth upper punch (24). The central axis of the fourth upper punch (24) coincides with the central axis of the inner cavity (11). The diameter of the fourth upper punch (24) is the same as the diameter of the upper part of the inner cavity (11).

4. The high-precision cold heading drilling device for chain sleeves according to claim 3, characterized in that: A stretching head (25) is provided on one side of the fourth upper punch (24). A chamfered head is formed on one end face of the stretching head (25). The central axis of the stretching head (25) coincides with the central axis of the inner cavity (11).

5. The high-precision cold heading drilling device for chain sleeves according to claim 1, characterized in that: The first lower punch (41) is located below the first upper punch (21), the second lower punch (42) is located below the second upper punch (22), and a third lower punch (43) is provided on one side of the second lower punch (42). The central axis of the third lower punch (43), the second lower punch (42) and the first lower punch (41) coincides with the central axis of the inner cavity (11). The diameter of the top of the third lower punch (43), the second lower punch (42) and the first lower punch (41) is the same as the diameter of the lower part of the inner cavity (11).

6. The high-precision cold heading drilling device for chain sleeves according to claim 5, characterized in that: The fourth lower punch (44) is located below the fourth upper punch (24). A chamfered head is formed on one end face of the fourth lower punch (44). The central axis of the fourth lower punch (44) coincides with the central axis of the inner cavity (11). The diameter of the fourth lower punch (44) is the same as the diameter of the lower part of the inner cavity (11).

7. A high-precision cold heading drilling device for chain sleeves according to claim 6, characterized in that: The fifth lower punch (45) is located below the stretching head (25). One end face of the fifth lower punch (45) has an outwardly protruding chamfered head. The diameter of the fifth lower punch (45) is the same as the diameter of the stretching head (25).

8. The high-precision cold heading drilling device for chain sleeves according to claim 1, characterized in that: The guide cylinder (51) is slidably sleeved on the outside of the upper punch group (2) and the lower punch group (4), and a buffer component (52) is provided inside the guide cylinder (51).

9. A high-precision cold heading drilling device for chain sleeves according to claim 8, characterized in that: The buffer component (52) consists of a connecting plate (521) and a buffer spring (522). The connecting plate (521) is fixed to one end of the upper punch assembly (2) and the lower punch assembly (4). The connecting plate (521) and the guide cylinder (51) slide against each other. The buffer spring (522) is sleeved on the outside of the upper punch assembly (2) and the lower punch assembly (4). The two ends of the buffer spring (522) are fixedly connected to the connecting plate (521) and the guide cylinder (51) respectively.

10. A high-precision cold heading drilling device for chain sleeves according to claim 1, characterized in that: The sleeve body (6) has grooves (61) formed on its upper and lower end faces after cold heading, and the sleeve body (6) has positioning grooves (62) formed on its surface after being forged by the stretching head (25).

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