Elastic pin hemming tool

Abstract

The utility model discloses an elastic pin hemming tool which comprises a pressing drill bit, a workpiece limiting structure and a hydraulic mechanism, the workpiece limiting structure comprises a floating disc and a positioning piece limited on the floating disc, a positioning groove used for containing an elastic pin to be machined is formed in the positioning piece, and a groove used for forming a hemming is formed in the top of the positioning groove; the pressing drill bit is fixed above the positioning groove, and the hydraulic mechanism is arranged below the floating disc and used for jacking the floating disc to enable the floating disc to move upwards relative to the pressing drill bit. A top plate of the pressing drill bit is relatively fixed, a plurality of strong springs are arranged between the top plate and the floating disc, the hydraulic mechanism performs two-section type jacking on the floating disc, the first section firstly jacks the floating disc until the to-be-machined elastic pin is in part contact with the pressing drill bit, and then the jacking force is removed, so that the floating disc returns to the original position under the action of the strong springs; and the second section is jacked in place, so that the stress generated in the pressing process is released, and the yield is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of alloy steel curling, and in particular relates to an elastic pin curling tool. Background Art

[0002] Alloy steel is a steel material containing a certain amount of alloying elements (such as chromium, molybdenum, nickel, etc.), which can reach a fairly high hardness after proper heat treatment. Generally, the hardness of alloy steel ranges from 20 to 60HRC, but there are also some special types of alloy steel that can reach higher hardness. For example, with advanced alloy design and precise heat treatment process, some special alloy steels and ceramic-reinforced composite materials can even reach extremely high hardness of 70HRC or even 80HRC.

[0003] For alloy steel with high hardness, the hardness is high after heat treatment, and it is easy to break when subjected to greater pressure. Therefore, there is a problem of low yield rate in the curling process of preparing elastic pins. Utility Model Content

[0004] In view of the above technical problems, the utility model proposes an elastic pin curling tool, which adopts a two-stage hydraulic method for releasing stress to improve the processing yield rate, wherein the elastic pin is made of alloy steel with relatively high hardness.

[0005] An elastic pin curling tool, comprising a pressing drill, a workpiece limiting structure and a hydraulic mechanism, wherein the workpiece limiting structure comprises a floating plate, a positioning member limited on the floating plate, the positioning member is provided with a positioning groove for placing the elastic pin to be processed, and the top of the positioning groove is provided with a groove for forming a curling edge;

[0006] The pressing drill bit is fixed above the positioning groove, and the hydraulic mechanism is arranged below the floating plate to lift the floating plate so that it moves upward relative to the pressing drill bit;

[0007] The top plate of the compression drill bit is relatively fixed, and a plurality of strong springs are arranged between the top plate and the floating plate, so as to make the floating plate move downward relative to the compression drill bit when the lifting force of the hydraulic mechanism is removed;

[0008] The hydraulic mechanism lifts the floating plate in two stages. In the first stage, the floating plate is lifted until the elastic pin to be processed contacts the pressing drill bit part, and then the lifting force is removed so that the floating plate returns to its original position under the action of the strong spring; and the second stage lifts the floating plate into place again.

[0009] Furthermore, the hydraulic mechanism is fixed on the bottom plate, and the bottom plate and the top plate are fixedly connected via a plurality of support columns; the support columns are respectively an upper column and a lower column, the diameter of the lower column is larger than the diameter of the upper column, the upper column passes through the floating plate and is fixed on the top plate, and the diameter of the hole on the floating plate is larger than the diameter of the upper column and smaller than the diameter of the lower column.

[0010] Furthermore, the strong spring is sleeved on the upper column.

[0011] Furthermore, a limiting groove matching the shape of the positioning member is provided on the floating plate, and when the positioning member is placed in the limiting groove, the positioning groove is directly opposite to the bottom of the pressing drill bit.

[0012] Furthermore, positioning grooves of different sizes are provided at both ends of the positioning member.

[0013] Furthermore, the positioning groove is a through groove, and the elastic pin to be processed passes through it and contacts the floating disk, and the alloy hardness of the contact surface is higher than that of the elastic pin to be processed.

[0014] The utility model adopts a two-stage jacking method to perform curling pressing of the elastic pin, which can release the stress generated during the pressing process and improve the yield rate; at the same time, the entire tooling structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the elastic pin;

[0016] Figure 2 It is a schematic diagram of a top view of an elastic pin;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the elastic pin crimping tooling;

[0018] Figure 4 for Figure 3 A magnified image of point A;

[0019] Figure 5 It is a schematic diagram of the limit slot;

[0020] Figure 6 It is a schematic diagram of the side structure of the elastic pin crimping tooling;

[0021] Figure 7 It is a schematic diagram of the positioning part structure. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0023] The main purpose of the utility model is to press the cylindrical alloy steel into Figure 1 , 2 The elastic pin shown. Since the hardness of the elastic pin to be processed is relatively high, the material used is alloy steel such as tool steel and war damage steel. In order to improve the yield rate, the following technical solutions are provided.

[0024] Example 1

[0025] A flexible pin crimping tool, such as Figure 3-7 As shown, it includes a pressing drill bit 1, a workpiece limiting structure and a hydraulic mechanism, the workpiece limiting structure includes a floating plate 2, a positioning member 3 limited on the floating plate 2, the positioning member 3 is provided with a positioning groove 4 for placing the elastic pin to be processed, and the top of the positioning groove 4 is provided with a groove 5 for forming a curled edge.

[0026] The pressing drill bit 1 is fixed above the positioning groove 4 , and the hydraulic mechanism is arranged below the floating plate 2 for lifting the floating plate 2 to make it move upward relative to the pressing drill bit 1 .

[0027] The top plate 6 of the pressing drill bit 1 is relatively fixed, and a plurality of strong springs 7 are arranged between the top plate 6 and the floating plate 2, so as to enable the floating plate 2 to move downward relative to the pressing drill bit 1 when the lifting force of the hydraulic mechanism is removed.

[0028] The hydraulic mechanism performs two-stage lifting of the floating plate 2. In the first stage, the floating plate 2 is lifted until the elastic pin to be processed contacts part of the pressing drill bit 1, and then the lifting force is removed, so that the floating plate 2 returns to its original position under the action of the strong spring 7; and the second stage lifts it into place again.

[0029] The degree of contact referred to by "partial contact" here is based on historical experience for different alloy steel materials. Figure 3 The hand pressure hydraulic pump shown in the figure, the lifting at both ends is carried out under manual observation, and an automatic hydraulic mechanism that controls the lifting degree in advance according to the alloy steel material can also be used. Since hydraulic control belongs to the existing technology, such as proportional valve control and servo valve control, it will not be described here.

[0030] Metals are subjected to various forms of stress during processing, such as residual stress, internal stress of the structure, etc. These stresses may cause deformation, cracks or other quality problems in metal parts during use. Therefore, releasing the stress in metal parts is crucial to ensure their performance and quality. The purpose of using two-stage lifting in this embodiment is to first apply a certain limit of pressure to the elastic pin, and then fully release its stress, reduce the probability of deformation and cracking, and improve the yield rate.

[0031] The top plate 6 can be relatively fixed in such a manner that the hydraulic mechanism is fixed on the bottom plate 8 , and the bottom plate 8 and the top plate 6 are fixedly connected via a plurality of support columns 9 .

[0032] To ensure that the floating plate 2 can move up and down, the support columns 9 are respectively upper columns and lower columns (see Figure 6 ), the diameter of the lower column is larger than that of the upper column, the upper column passes through the floating plate 2 and is fixed on the top plate 6, the diameter of the hole through which the floating plate 2 passes is larger than the diameter of the upper column and smaller than the diameter of the lower column; the strong spring 7 can be directly sleeved on the upper column.

[0033] In order to facilitate accurate alignment, a limiting groove 10 matching the shape of the positioning member 3 is provided on the floating plate 2. When the positioning member 3 is placed in the limiting groove 10, the positioning groove 4 is directly opposite to the bottom of the pressing drill bit 1.

[0034] In this embodiment, the positioning member 3 is in the shape of a long strip, and positioning grooves 4 of different sizes are provided at both ends thereof. Figure 7 , can be used to process elastic pins with different diameters or elastic pins with different curling degrees.

[0035] Of course, in order to ensure the processing effect, the hardness of the pressing drill bit 1 must be higher than that of the elastic pin to be processed. At the same time, the force point below the elastic pin also needs to have a higher hardness. For this reason, the positioning groove is designed as a through groove, and the elastic pin to be processed passes through it and contacts the floating plate 2. The alloy hardness of the contact surface is higher than that of the elastic pin to be processed.

[0036] In order to make the alloy hardness of the contact surface higher than that of the elastic pin to be processed, the entire floating plate can be made of alloy steel with higher hardness. However, in order to control the cost, only the part in contact with the elastic pin can be replaced with alloy steel with higher hardness, and then welded to the floating plate body. Figure 4 The shaded part in the limiting groove 10.

[0037] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the utility model.

Claims

1. An elastic pin crimping tool, comprising a pressing drill bit (1), a workpiece limiting structure and a hydraulic mechanism, characterized in that: The workpiece limiting structure comprises a floating plate (2), a positioning member (3) limited on the floating plate (2), the positioning member (3) being provided with a positioning groove (4) for placing the elastic pin to be processed, and the top of the positioning groove (4) being provided with a groove (5) for forming a curling edge; The pressing drill bit (1) is fixed above the positioning groove (4), and the hydraulic mechanism is arranged below the floating plate (2) and is used to lift the floating plate (2) so that it moves upward relative to the pressing drill bit (1); The top plate (6) of the pressing drill bit (1) is relatively fixed, and a plurality of strong springs (7) are arranged between the top plate (6) and the floating plate (2), so as to enable the floating plate (2) to move downward relative to the pressing drill bit (1) when the lifting force of the hydraulic mechanism is released; The hydraulic mechanism lifts the floating plate (2) in two stages. In the first stage, the floating plate (2) is lifted until the elastic pin to be processed is in partial contact with the pressing drill bit (1). Then, the lifting force is removed so that the floating plate (2) returns to its original position under the action of the strong spring (7). The second stage lifts the floating plate (2) into place again.

2. The elastic pin crimping tool according to claim 1, characterized in that: The hydraulic mechanism is fixed on the bottom plate (8), and the bottom plate (8) and the top plate (6) are fixedly connected via a plurality of support columns (9); the support columns (9) are respectively an upper column and a lower column, the diameter of the lower column is larger than the diameter of the upper column, the upper column passes through the floating plate (2) and is fixed on the top plate (6), and the diameter of the through hole on the floating plate (2) is larger than the diameter of the upper column and smaller than the diameter of the lower column.

3. The elastic pin crimping tool according to claim 2, characterized in that: The strong spring (7) is sleeved on the upper column.

4. The elastic pin crimping tool according to claim 1, characterized in that: The floating plate (2) is provided with a limiting groove (10) whose shape matches that of the positioning member (3); when the positioning member (3) is placed in the limiting groove (10), the positioning groove (4) is directly opposite to the lower side of the pressing drill bit (1).

5. The elastic pin crimping tool according to claim 1, characterized in that: Positioning grooves (4) of different sizes are provided at both ends of the positioning member (3).

6. The elastic pin crimping tool according to claim 1, characterized in that: The positioning groove (4) is a through groove, through which the elastic pin to be processed passes, and contacts the floating plate (2), and the alloy hardness of the contact surface is higher than that of the elastic pin to be processed.

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