CN112296233A

CN112296233A - Machining method of automobile shock absorption pipe

Info

Publication number: CN112296233A
Application number: CN202010897092.3A
Authority: CN
Inventors: 陈温暖; 李良浩
Original assignee: Guangzhou Kangchao Information Technology Co ltd
Current assignee: Guangzhou Kangchao Information Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-02-02

Abstract

The invention discloses a method for processing a tube for automobile shock absorption, which comprises the following steps: providing a first blank; pre-shrinking two ends of the first blank to obtain a second blank; performing cold heading molding on the blank II to obtain a blank III in a drum shape; turning two end faces of the third blank to perform a molded surface with a preset shape to obtain a fourth blank; wherein the profile of the blank four allows for the use of a shape generating force support during flow of the press formed metal under a predetermined upsetting force to achieve a predetermined tooth height and a predetermined tooth plan area; and stamping the molded surface of the blank IV to form two end teeth to obtain the automobile shock absorption pipe. The invention can improve the processing efficiency of the product by adopting the cold heading molding drum shape, turning the preformed molded surface and the processing method of stamping the two end teeth. And the molding surface has a specific structural shape, so that the preset tooth height and the preset tooth plane area can be achieved.

Description

Machining method of automobile shock absorption pipe

Technical Field

The invention relates to a machining and manufacturing process of automobile damping parts, in particular to a machining method of an automobile damping pipe.

Background

The two end faces of the existing automobile damping pipe are gradually common in tooth arrangement. The existing method for processing the two-end teeth comprises the steps of firstly forming a drum shape by cold heading, then milling the two-end teeth, and clamping and milling the two-end teeth twice. The method has the advantages of long processing time, low processing efficiency and high cost.

In addition, when processing such products, the height of the face teeth of the automobile shock absorption tube is usually required, and if the height of the teeth is not required, the product performance is seriously influenced.

Disclosure of Invention

The invention aims to provide a method for processing a tube for automobile shock absorption, which can improve the processing efficiency of products.

Aiming at the purposes, the invention adopts the following technical scheme:

a processing method of a tube for automobile shock absorption comprises the following steps:

providing a first blank, wherein the first blank extends along the axial direction and is provided with an inner hole penetrating through the axial direction;

pre-shrinking two ends of the first blank to obtain a second blank;

performing cold heading molding on the blank II to obtain a drum shape to obtain a blank III;

turning two end faces of the third blank to perform a molded surface with a preset shape to obtain a fourth blank; wherein the profile of the blank four allows for the use of shape-generating force support during flow of the press formed metal under a predetermined upsetting force to achieve a predetermined tooth height and a predetermined tooth plan area; the cross section of the molded surface of the blank IV can be obtained, and the ratio of the axial dimension to the radial dimension of the cross section is 0.3-0.4 times; the cross-sectional shape has a contour starting point on the inner diameter side of the blank member four and a contour end point on the outer diameter side, and the contour end point is basically flush with the contour starting point in the axial direction;

and stamping two end teeth on the molded surface of the blank IV to obtain the automobile shock absorption pipe.

Further, the step of providing the first blank includes:

providing a wire having a predetermined length;

processing a positioning hole at one end of the wire to obtain a first blank;

processing a positioning hole at the other end of the first blank to obtain a second blank;

corresponding to the positioning hole, extruding a first hole with a first depth at one end of the blank II, and extruding a second hole with a second depth at the other end of the blank II to obtain a blank III;

and perforating the first hole and the second hole to form an inner hole which axially penetrates through the first hole and the second hole to obtain the first blank.

Further, the step of providing a wire comprises:

providing a straight wire;

and cutting the linear material into a preset length to obtain the wire.

Further, the step of providing a straight wire comprises;

providing a coiled wire material;

and straightening the coiled wire to obtain the straight wire.

Further, the step of obtaining the first blank further comprises:

and processing a positioning hole at one end of the wire rod, and simultaneously processing a chamfer at the other end of the wire rod.

Further, the step of obtaining the second blank further comprises:

and processing a chamfer angle at one end of the first blank while processing a positioning hole at the other end of the first blank.

Further, after the first blank is obtained, the first blank is turned over before the positioning hole is machined in the other end of the first blank.

Further, the section shape of the profile of the blank IV is bilaterally symmetrical.

The beneficial effects of the invention include: by adopting the cold heading forming drum shape, turning the preformed molded surface and the processing method of stamping the two end teeth, the processing efficiency of the product can be improved.

Drawings

FIG. 1 is a wire rod obtained in a first step of the process of the present invention;

FIG. 2 is a first blank obtained in step two of the present inventive processing method;

FIG. 3 is a second blank obtained in step three of the process of the present invention;

FIG. 4 is a third blank obtained in step four of the process of the present invention;

FIG. 5 is a first blank resulting from step five of the process of the present invention;

FIG. 6 is a second blank resulting from step six of the process of the present invention;

FIG. 7 is a third blank resulting from step seven of the process of the present invention;

FIG. 8 is a cross-sectional view of a fourth blank resulting from step eight of the process of the present invention;

FIG. 9 is an enlarged schematic view at D of FIG. 8;

FIG. 10 is a tooth height data plot of two end teeth press formed on the profile of the blank four of FIG. 8;

FIG. 11 is a schematic front view of an automotive shock absorbing tube obtained in step nine of the process of the present invention;

FIG. 12 is a top view of FIG. 11;

FIG. 13 is a cross-sectional view taken along line K-K of FIG. 12;

fig. 14 is a sectional view F-F in fig. 12.

Detailed Description

The present invention may be further described with reference to the following detailed description, which is provided for purposes of illustration and description.

The machining method of the automobile shock absorption pipe in the preferred embodiment of the invention comprises the following steps:

the method comprises the following steps: providing a coiled wire material, and straightening the coiled wire material to obtain a straight wire material. Wherein the wire roll may be straightened using a suitable straightening device, such as, but not limited to, a straightening wheel. The linear material is then transferred to the next station for cutting by suitable transfer means, which may be conveyor belts, feed wheels, etc., and the cutting means may be cutters, blanking dies, etc. The linear material is cut into a predetermined length by a cutting device, thereby obtaining a wire material 1 extending in the axial direction and having a predetermined length, as shown in fig. 1. The length of the wire can be selected according to actual needs.

Step two: the cut wire 1 is transferred by the transfer device to the next station, and a positioning hole 21 and a chamfer 22 in the circumferential direction are formed at one end 10 and the other end 20 of the wire 1 to obtain a blank 2, as shown in fig. 2. The transfer device may be a robot, a suction device, or the like.

Step three: and turning the blank I2 by using a turning device, so that a positioning hole 21 and a chamfer 22 with the circumferential direction at one end 10 are machined at the other end 20 of the blank I2 at the station to obtain a blank II 3, as shown in figure 3. The flipping means may be a robot, a flipping station, or the like.

Step four: at this station, a first hole 41 with a first depth is extruded at one end of the second blank 3 and a second hole 42 with a second depth is extruded at the other end corresponding to the positioning hole 21, so as to obtain a third blank 4, as shown in fig. 4. Wherein the first depth is greater than the second depth, i.e. the first hole 41 is a deep hole and the second hole 42 is a shallow hole. The purpose of extruding the shallow holes is to ensure that the surface of the inner hole 51 is smooth when the blank three 4 is punched through the inner hole 51 in the next station (as shown in figure 5).

Step five: the first hole 41 and the second hole 42 are punched through to form an inner hole 51 penetrating in the axial direction, and a blank member 5 is obtained, as shown in fig. 5. The inner hole 51 is punched, firstly, the product structure is needed, and the other function is that the product is provided with a core rod in the holes at the two ends, so that the inner hole of the product is not deformed.

Step six: and pre-shrinking two ends of the first blank 5 to obtain a second blank 6, as shown in fig. 6. The diameter of the two ends of the second pre-shrunk blank 6 is smaller than that of the middle part of the second pre-shrunk blank. The effect of this is that a drum shape of detectable size can be successfully made in the next step.

Step seven: and performing cold heading forming on the blank II 6 to obtain a blank III 7, as shown in FIG. 7.

Step eight: both end faces of the blank three 7 are turned to preform a mold surface 81 having a predetermined shape, and a blank four 8 is obtained, as shown in fig. 8. Wherein, the turning can adopt CNC turning, and the processing time is 40 seconds per piece. The profile 81 of the blank four allows for the use of shape generating force support during flow of the press formed metal under a predetermined upset force to achieve a predetermined tooth height and a predetermined tooth plan area.

The processing method has the difficulties that when the upsetting force is increased at the two ends of the drum-shaped pipe fitting, the drum-shaped deformation can not meet the requirement of a drawing seriously, and if the upsetting force is too small, the tooth heights at the two ends are not high and can not meet the requirement. In order to achieve a tooth height that is both faces up, the profile must be of an effective size, and the shape-producing force support is used to reach the tooth height as the press-formed metal flows.

Preferably, the cross section of the profile 81 of the blank four is obtained, and the ratio H2/H1 of the axial dimension H2 to the radial dimension H1 of the cross section is 0.3-0.4. For example, as shown in FIG. 9, in the present embodiment, the axial dimension H2/H1 is 0.34.

Referring to fig. 9, the sectional shape has a contour start point a on the inner diameter side of the blank member four and a contour end point B on the outer diameter side, the contour end point B being flush with the contour start point a in the axial direction. It should be noted that the names of the contour starting point and the contour end point are only used for convenience of description and are not limited thereto, and a may be referred to as a contour end point and B may be referred to as a contour starting point.

Preferably, the profile 81 of the blank four has a bilaterally symmetrical cross-sectional shape.

In this embodiment, the predetermined height of the teeth is required to be at least 0.3mm according to product requirements. Through the arrangement of the section shape, the tooth height of the punched tooth can meet the requirement. In this embodiment, by punching the profile 81 having this shape, the data of the tooth height is shown in fig. 10, and it can be seen that the tooth height meets the requirements.

Step nine: the opposite end teeth 91 are press-formed on the profile 81 of the blank four 8 to obtain the automobile shock absorbing tube 9, as shown in fig. 11. As shown in fig. 12, 13 and 14, the teeth 91 have several critical dimensions, such as the distance S1 from the radial side of the tooth 91, the tooth height H, the tooth width W, and the tooth angle θ. The profile 81 in this embodiment is of a reasonable design so that these dimensions of the teeth 91 are all in line with the product requirements. In this embodiment, S1 is about 0.6mm, and H is

W is

Theta is 60 +/-5 degrees.

The processing method can improve the processing efficiency of products by adopting a processing method of cold heading forming drum shape, turning the preformed molded surface and stamping two end teeth. In addition, the profile has a reasonable shape, so that the height and the plane area of the teeth meet the requirements of a drawing.

The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all equivalent technical changes that can be made by applying the present invention are included in the scope of the present invention.

Claims

1. A processing method of a tube for automobile shock absorption is characterized by comprising the following steps:

pre-shrinking two ends of the first blank to obtain a second blank;

turning two end faces of the third blank to perform a molded surface with a preset shape to obtain a fourth blank; wherein the profile of the blank four allows for the use of shape-generating force support during flow of the press formed metal under a predetermined upsetting force to achieve a predetermined tooth height and a predetermined tooth plan area; the cross section of the molded surface of the blank IV can be obtained, and the ratio of the axial dimension to the radial dimension of the cross section is 0.3-0.4; the cross-sectional shape has a contour starting point on the inner diameter side of the blank member four and a contour end point on the outer diameter side, and the contour end point is flush with the contour starting point in the axial direction;

2. The method for processing a tube for shock absorption of an automobile according to claim 1, wherein: the step of providing a blank one comprises:

providing a wire having a predetermined length;

processing a positioning hole at one end of the wire to obtain a first blank;

3. The method for processing a tube for shock absorption of an automobile according to claim 2, wherein: the step of providing a wire includes:

providing a straight wire;

and cutting the linear material into a preset length to obtain the wire.

4. The method of processing a pipe for shock absorption of an automobile according to claim 3, wherein: the step of providing a straight wire comprises;

providing a coiled wire material;

and straightening the coiled wire to obtain the straight wire.

5. The method for processing a tube for shock absorption of an automobile according to claim 2, wherein: the step of obtaining the first blank further comprises:

6. The method for processing a tube for shock absorption of an automobile according to claim 2, wherein: the step of obtaining the second blank further comprises:

7. The method for processing a tube for shock absorption of an automobile according to claim 2, wherein: and after the first blank is obtained, turning the first blank before the positioning hole is machined in the other end of the first blank.

8. The method for processing a tube for shock absorption of an automobile according to claim 1, wherein: the section shape of the profile of the blank IV is bilaterally symmetrical.