Bush flaring and flanging tool

Abstract

The utility model discloses a bush flaring and flanging tool which comprises an upper die, a lower die, a forming punch, a buffer cover, a driving piston, a guide rod and a buffer assembly, the upper die is connected to the top of the lower die in a sliding mode through the guide rod, and the center of the lower die is provided with a forming boss protruding towards the top. The top end face of the forming boss is provided with a positioning punching groove where a lining is embedded, the center of the end face of the upper die is provided with a hollow column extending downwards, the forming punch is axially connected into the hollow column in a sliding mode, one end of the forming punch extends out of the hollow column, and the other end of the forming punch is provided with a driving piston axially sliding in the hollow column. The buffer cover is arranged at the other end of the hollow column for sealing; the forming punch in the tool is used for flaring and flanging the lining, and the annular punch is used for trimming after flanging is completed, so that the processes of flaring, flanging and trimming are completed by one set of tool, stations do not need to be switched again in the whole machining process, and meanwhile, the purpose of improving the working efficiency can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bushing processing equipment, in particular to a bushing expansion and flanging tool. Background Art

[0002] The main function of the bushing in the equipment is to protect the shaft parts. In order to ensure a certain oil storage capacity, the current copper-based bushing will have one end of the bushing designed into a bell-mouth shape during the design process. This shape can store a certain amount of lubricating oil in it during axial sliding, thereby providing better protection for the shaft parts. In order to facilitate installation and positioning, a flat surface is formed at one end of the bushing bell-mouth through a flanging process. However, the existing processing method requires the use of two types of tooling for processing and forming, and the bushing bell-mouth needs to be trimmed after the bushing is formed, which makes the entire processing procedure very cumbersome and reduces the production efficiency of the bushing. Therefore, a bushing expansion and flanging tool is designed to solve the above problems. Utility Model Content

[0003] In view of the shortcomings of existing bushing processing equipment, the purpose of the utility model is to provide a bushing expansion and flanging tool, which has the advantages of completing the expansion, flanging and trimming processes with one set of tooling and improving the processing efficiency.

[0004] To achieve the above-mentioned purpose, a technical solution adopted by the utility model is: a bushing expansion and flanging tool, including an upper die, a lower die, a forming punch, a buffer cover, a driving piston, a guide rod and a buffer assembly, the upper die is slidably connected to the top of the lower die through the guide rod, the center of the lower die has a forming boss protruding to the top, the top end face of the forming boss has a positioning punching groove for embedding the bushing, the center of the upper die end face has a hollow column extending downward, the forming punch is axially slidably connected in the hollow column, one end of the forming punch extends out of the hollow column, the other end of the forming punch is provided with a driving piston axially sliding in the hollow column, the buffer cover is arranged at the other end of the hollow column for sealing, a sealing chamber is formed between the buffer cover and the driving piston, the sealing chamber is filled with oil, the buffer cover has a buffer chamber, the buffer chamber is connected with the sealing chamber through an overflow hole, and a buffer assembly for absorbing the oil in the sealing chamber is provided in the buffer chamber;

[0005] Preferably, the outer edge of the bottom end of the hollow column has an annular punch for trimming, and the annular punch covers the forming punch;

[0006] Preferably, the buffer assembly includes a buffer piston and a spring, the buffer piston is axially slidably connected in the buffer cavity in the buffer cover, the spring is arranged in the buffer cavity, and the spring forces the buffer piston to compress the buffer cavity; in the process of the upper die punching into the lower die, since the flow of oil is limited by the overflow hole, the forming punch will not directly shrink into the ring punch during stamping and forming, and the forming punch will first punch into the bushing to expand and flanging the bushing, and after the bushing is expanded and flanging, the forming punch moves to the bottom end of the positioning groove, and since the punch press continues to apply downward force, the forming punch squeezes the oil in the sealing cavity into the buffer cavity, and the forming punch shrinks into the ring punch, and the ring punch is used to trim the edges during the continuous downward pressure of the punch press;

[0007] Preferably, the forming punch has a rounded corner for expanding the notch corresponding to the positioning notch;

[0008] Preferably, the outer shape of the forming punch is engaged with the positioning punch groove, and the outer diameter of the forming punch is larger than the inner diameter of the bushing;

[0009] The beneficial effect of the utility model is that the bushing is expanded and flanging is performed by a forming punch in the tooling, and after the flanging is completed, trimming is performed by a ring punch, so that a set of tooling can complete the expanding, flanging and trimming processes, and the entire processing process does not require switching workstations again, and the purpose of improving work efficiency can be achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a cross-sectional structural view of the utility model in a separated state;

[0011] Figure 2 This is a cross-sectional structural view of the utility model in the state of expansion and flanging forming;

[0012] Figure 3 This is a cross-sectional structural view of the utility model in the trimming state;

[0013] Figure 4 For this utility model Figure 3 A partial magnified view of area I in the middle. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0015] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0016] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided with", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figures 1 to 4 , the utility model embodiment includes:

[0018] A bushing expansion and flanging tool, comprising an upper die 1, a lower die 2, a forming punch 3, a buffer cover 4, a driving piston 5, a guide rod 6 and a buffer assembly 7, wherein the upper die 1 is slidably connected to the top of the lower die 2 through the guide rod 6, the center of the lower die 2 has a forming boss 21 protruding toward the top, the top end surface of the forming boss 21 has a positioning punching groove 22 for embedding the bushing, the center of the end surface of the upper die 1 has a hollow column 11 extending downward, the forming punch 3 is axially slidably connected in the hollow column 11, and the One end of the forming punch 3 extends out of the hollow column 11, and the other end of the forming punch 3 is provided with a driving piston 5 that axially slides in the hollow column 11. The buffer cover 4 is arranged at the other end of the hollow column 11 for sealing. A sealing cavity 8 is formed between the buffer cover 4 and the driving piston 5. The sealing cavity 8 is filled with oil. The buffer cover 4 has a buffer cavity 9, which is connected to the sealing cavity 8 through an overflow hole 41. The buffer cavity 9 is provided with a buffer component 7 for absorbing the oil in the sealing cavity 8.

[0019] The outer edge of the bottom end of the hollow column 11 has an annular punch 12 for trimming, and the annular punch 12 covers the forming punch 3;

[0020] The buffer assembly 7 includes a buffer piston 71 and a spring 72. The buffer piston 71 is axially slidably connected in the buffer cavity 9 in the buffer cover 4. The spring 72 is arranged in the buffer cavity 9. The spring 72 forces the buffer piston 71 to compress the buffer cavity 9. In the process of the upper die 1 punching into the lower die 2, since the flow of the oil is limited by the overflow hole 41, the forming punch 3 will not directly shrink into the ring punch 12 during stamping. The forming punch 3 will first punch into the bushing to expand and flanging the bushing. After the bushing is expanded and flanging, the forming punch 3 moves to the bottom end of the positioning groove 22. Since the punch press continues to apply downward force, the forming punch 3 squeezes the oil in the sealing cavity 8 into the buffer cavity 9, and the forming punch 3 shrinks into the ring punch 12. During the continuous downward pressure of the punch press, the ring punch 12 is used for trimming.

[0021] The forming punch 3 has a rounded corner 31 for expanding the notch corresponding to the positioning notch 22;

[0022] The outer shape of the forming punch 3 is engaged with the positioning punch groove 22, and the outer diameter of the forming punch 3 is larger than the inner diameter of the bushing;

[0023] Through the above settings, in the actual working process, its specific working principle is as follows:

[0024] First, fix the upper die 1 and the punch slider of the punch press, and fix the lower die 2 and the punch press workbench;

[0025] When processing the bushing, first put the bushing into the positioning punching groove 22, then start the punch press to drive the upper die 1 to punch into the lower die 2. During the process of the upper die 1 punching into the lower die 2, since the flow of oil is restricted by the overflow hole 41, the forming punch 3 will not directly shrink into the ring punch 12 during the stamping process, but first expand the bushing through the expanding fillet 31 on the forming punch 3, and then perform flanging under the extrusion of the forming punch 3 and the forming boss 21;

[0026] After the expansion and flanging of the bushing is completed, the forming punch 3 moves to the bottom end of the positioning punch groove 22. As the punch press continues to apply downward force, the forming punch 3 squeezes the oil in the sealing cavity 8 into the buffer cavity 9, and the forming punch 3 shrinks into the ring punch 12. During the continuous downward pressure of the punch press, the ring punch 12 presses down to trim the outer edge of the bushing exposed to the outer edge of the forming boss 21 after the flanging of the bushing;

[0027] After completing the above process, the punch press drives the upper die 1 and the lower die 2 to separate, so that the formed bushing can be taken out; during this process, the spring 72 forces the buffer piston 71 to compress the buffer cavity 9, thereby squeezing the oil in the buffer cavity 9 into the sealing cavity 8, so that the forming punch 3 returns to the initial state;

[0028] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bushing expansion and flanging tool, characterized in that: It includes an upper die, a lower die, a forming punch, a buffer cover, a driving piston, a guide rod and a buffer assembly, the upper die is slidably connected to the top of the lower die through the guide rod, the center of the lower die has a forming boss protruding to the top, the top end face of the forming boss has a positioning groove for embedding a bushing, the center of the upper die end face has a hollow column extending downward, the forming punch is axially slidably connected in the hollow column, one end of the forming punch extends out of the hollow column, the other end of the forming punch is provided with a driving piston axially sliding in the hollow column, the buffer cover is arranged at the other end of the hollow column for sealing, a sealing chamber is formed between the buffer cover and the driving piston, the sealing chamber is filled with oil, the buffer cover has a buffer chamber, the buffer chamber is connected with the sealing chamber through an overflow hole, and a buffer assembly for absorbing the oil in the sealing chamber is provided in the buffer chamber.

2. A bushing expansion and flanging tool according to claim 1, characterized in that: The outer edge of the bottom end of the hollow column is provided with an annular punch for trimming, and the annular punch covers the forming punch.

3. The bushing expansion and flanging tool according to claim 1, characterized in that: The buffer assembly comprises a buffer piston and a spring. The buffer piston is axially slidably connected in a buffer cavity in the buffer cover. The spring is arranged in the buffer cavity. The spring forces the buffer piston to compress the buffer cavity.

4. The bushing expansion and flanging tool according to claim 1, characterized in that: The forming punch has a flaring fillet for flaring at a position corresponding to the positioning notch.

5. The bushing expansion and flanging tool according to claim 1, characterized in that: The outer shape of the forming punch is engaged with the positioning punch groove, and the outer diameter of the forming punch is larger than the inner diameter of the bushing.

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