A processing method for processing a certain kind of thin-walled special-shaped part

Abstract

This invention provides a processing method for a certain type of thin-walled irregularly shaped parts, including stamping, bending, and welding. The irregular shape of the thin-walled irregularly shaped parts is mainly at both ends; the middle section can be formed by simple sheet metal bending. However, these thin-walled irregularly shaped parts come in various length specifications. The method of this invention is as follows: Step one, a set of stamping dies is used to form the complex end features, symmetrically forming components, wire-cutting components, and removing excess material through trimming and grinding; Step two, different length specifications of the middle section are formed by bending; Step three, the final shape is completed by welding. This invention can process and manufacture a certain type of thin-walled irregularly shaped parts with various length specifications.

Description

Technical Field

[0001] This invention belongs to the field of segmented stamping and welding forming technology, and specifically relates to a processing method for segmented forming of irregular thin-walled parts. Background Technology

[0002] Thin-walled machined parts are widely used in the aerospace field. This invention provides a stamping die. Currently, the production volume of such irregular thin-walled parts varies for each specification, and the length control method generally adopts the manufacturing of stamping dies for integral forming according to specifications, resulting in high tooling costs.

[0003] For small batches of certain thin-walled irregularly shaped 5A06 parts, integral forming with large sheet metal is a common method, but it involves a large volume of work and is prone to deformation during clamping and processing, resulting in high costs. Custom-made integral stamping molds, on the other hand, are more expensive, require fewer parts, and have longer processing cycles. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a processing method for thin-walled irregular parts, which can realize the processing of parts of different specifications by segmented forming, reduce costs and shorten the production cycle.

[0005] The technical solution of this invention is:

[0006] A method for machining a certain type of thin-walled irregular-shaped parts, comprising:

[0007] S1: Thin-walled irregular parts include head assemblies at both ends and connecting parts in the middle. The head assemblies at both ends and the connecting parts connected to the head assemblies are directly connected as stamping parts. The stamping parts are obtained by die stamping.

[0008] S2: The direction from one head assembly to another head assembly is the axial direction. The stamped part is divided along the symmetrical plane of the axial direction and then formed into two separate head parts.

[0009] S3: The remaining connecting part in the middle is obtained by bending;

[0010] S4: Connect the head part to the connecting part by welding.

[0011] The connection portion of each head assembly is 2-3 mm.

[0012] When designing the structure of the stamped parts, a 2-3mm connecting part is connected to each head assembly. In this way, each head assembly in the resulting segmented head parts is also connected to a 2-3mm connecting part. During welding, the connecting part of the head assembly is directly aligned with the remaining connecting part in the middle for welding. The connecting part is a straight plate, so this setting ensures straight-to-straight welding, making the welding process simpler and easier to operate, rather than the curved head assembly and connecting part being directly aligned for welding at a certain angle.

[0013] In step S2, the stamped parts are divided by wire cutting.

[0014] In step S2, before dividing the stamped parts, it is necessary to align the stamped parts.

[0015] The alignment reference is the planes at both ends of the stamping part in the axial direction, the straight surfaces on both sides, and the skirt of surface A. There are two straight surfaces facing each other at the shoreline position in the middle of the stamping part in the axial direction. The upper surface of the die has a horizontal surface A for positioning the sheet metal to be stamped. The planes at both ends of the axial direction, the straight surfaces on both sides, and the skirt of surface A are perpendicular to each other.

[0016] After the skirt on side A of the stamped part is stamped, it is flattened by a stamping machine and then formed into a plate as a positioning reference.

[0017] In step S4, a trial assembly is performed before welding to confirm the overall length and dimensions of the thin-walled irregular part.

[0018] In step S4, welding includes spot welding and splicing welding. A general tooling is used to fix the head part and the connecting part, and then the head part and the connecting part are spot welded. After that, the spot-welded products are spliced ​​to obtain thin-walled irregular parts.

[0019] During spot welding, the connecting part of the head component is aligned with the connecting part in the middle of the head assembly, ensuring that straight edges are aligned during welding.

[0020] The processing method described above in this invention includes stamping, sheet metal bending, and welding. This segmented forming process enables the processing of parts of different specifications, reduces costs, and shortens the production cycle to some extent.

[0021] Because the material of this type of part is 1.5mm thick 5A06 aluminum alloy, the overall length of the part is about 1000mm and the width is about 50mm, the requirements for the surface profile after forming are not high and there are no requirements for water tightness or air tightness in assembly, this processing solution meets the design requirements and usage requirements.

[0022] In summary, this application includes at least the following beneficial technical effects:

[0023] A processing method for thin-walled irregular parts is proposed, which seeks commonalities while reserving differences, and forms parts in segments. The complex parts that cannot be formed by simple bending are separated and formed by stamping separately. This allows the same mold to process parts of different specifications, spreading the cost across the parts of different specifications. Moreover, the size of the mold for segmented forming is only 1 / 10 or even less of the size of the mold for integral forming, which shortens the mold production cycle and reduces the cost of mold production. Attached Figure Description

[0024] Figure 1 The die cavity of a stamping forming die;

[0025] Figure 2 The punch of a stamping die;

[0026] Figure 3 A schematic diagram of the overall structure of the punch and die assembly.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Punch; 2. Die;

[0029] 3. Straight sides;

[0030] 4. Surface A: Positioning surface of the sheet metal before stamping;

[0031] Axial direction: corresponds to the axis of the mold, and also to the axis of the stamping component. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0033] This application discloses a processing method for thin-walled irregularly shaped parts, such as... Figure 1 As shown, the irregular features of a certain type of thin-walled irregular part are mainly at both ends. The thin-walled irregular part includes head components at both ends and a connecting part in the middle. The head components at both ends are symmetrical. The length of the connecting part in the middle varies for thin-walled irregular parts of different specifications.

[0034] For this thin-walled irregularly shaped part, most of the intermediate connecting part is removed, and each head assembly and the structure directly connected to the head assembly are treated as stamping parts. The corresponding punch and die are designed according to the structure of this stamping part. For example... Figure 3 As shown, the die includes a punch 1 and a die 2. The upper surface of the die 1 has a recessed portion in the middle that matches the shape of the stamped part, and the lower surface of the punch 1 has a protrusion in the middle that matches the shape of the stamped part. The protrusion and the recessed portion cooperate with each other. The upper surface of the die 1 has horizontal A-surfaces on both sides of the recessed portion.

[0035] pass Figure 1 and Figure 2The die-stamping process yields a stamped part consisting of two integrated head components, which are symmetrical. The direction from one head component to the other is the axial direction. The stamped part is then divided along the axial plane of symmetry to obtain two separate head components. Each stamped part has two parallel straight surfaces along its axial direction at its midpoint. These two straight surfaces are perpendicular to surface A, which is the horizontal surface on the upper surface of die 2 used to position the sheet metal to be stamped.

[0036] The connecting part of the middle section of this type of thin-walled irregular part can be formed by simple sheet metal bending, and the forming section of the middle section is the cross section of the symmetrically divided stamping assembly.

[0037] Because this thin-walled irregular part has multiple length specifications along the axial direction and its production volume is relatively low at certain times, considering the irregular features of the ends that can be formed separately, it is processed in sections and then welded together. Segmented forming reduces the manufacturing cost of tooling for integral stamping of the same type of part, and the overall length is controlled by controlling the different lengths of the middle sections.

[0038] The methods specifically include:

[0039] Step one: After laser cutting rectangular plates of uniform specifications and dimensions, they can be formed using a set of stamping dies (attached). Figure 1 and attached Figure 2 The complex end features are formed by using the countersunk surface of surface A of die 2 as the positioning reference for the rectangular sheet metal. After stamping, symmetrical stamped parts are formed. Then, the skirt of surface A is corresponding to the sheet metal after it is flattened by a stamping machine. The position of the stamped parts is aligned by using the axial length of the formed stamped parts, the straight surfaces on both sides, and the flattened skirt of surface A as references. The axial length is used as the center as the cutting plane. The symmetrical stamped parts are cut at the cutting plane to obtain two separate head parts. Finally, the excess skirt material is trimmed and ground off.

[0040] Step 2: Laser cutting of rectangular plates of different lengths, with the length direction corresponding to the axial direction of the stamped component in Step 1. The connecting parts of different length specifications are formed by bending. The cross section of the connecting part is consistent with the line-cut cross section in Step 1, ensuring that straight edges can be aligned during the next welding step.

[0041] Step 3: Pre-welding trial assembly. After confirming the overall axial length dimensions after splicing, use general tooling to fix the head assembly and connecting parts. Then, use spot welding to initially fix the head assembly and connecting parts, and then complete the final shape through splicing welding. Finally, the fitter grinds the weld and adjusts the shape.

[0042] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A method for machining a certain kind of thin-walled profiled part, characterized in that: The method comprises the following steps: S1: the thin-wall special-shaped part comprises head assemblies at two ends and a connecting part in the middle, and the head assemblies at two ends and the connecting part connected with the head assemblies are directly connected as a stamping part, and the stamping part is obtained by stamping forming with a concave-convex die; S2: the direction in which one head assembly points to the other head assembly is an axial direction, and the stamping part is divided along the axial direction to obtain two separated head parts; S3: the connecting part remaining in the middle is obtained by bending forming; S4: the head parts and the connecting part are connected by welding.

2. The method according to claim 1, wherein: The connecting part connected with each head assembly is 2-3 mm.

3. The method of claim 1, wherein the method is used for processing a thin-walled special-shaped part. In the step S2, the stamping part is divided by wire cutting.

4. The method of claim 1, wherein the method is used for processing a thin-walled special-shaped part. Before the stamping part is divided in the step S2, the stamping part needs to be aligned.

5. The method of claim 4, wherein the method is used for processing a thin-walled special-shaped part. The alignment reference is the plane at two ends in the axial direction, the straight surface on two sides, the skirt of the A surface, and there are two straight surface parts opposite to each other at the shore line position of the stamping part at the middle position in the axial direction, the horizontal plane on the upper surface of the concave die is the A surface, and the plane at two ends in the axial direction, the straight surface on two sides, and the skirt of the A surface are perpendicular to each other.

6. The method of claim 5, wherein the method is used for processing a thin-walled special-shaped part. After the stamping forming of the skirt of the A surface of the stamping part, the flat plate formed by the stamping machine is used as the positioning reference.

7. The method of claim 1, wherein the method is used for machining a thin-walled special-shaped part. In the step S4, the overall length of the thin-wall special-shaped part is confirmed by trial assembly before welding.

8. The method of claim 1, wherein the method is used for machining a thin-walled special-shaped part. In the step S4, the welding comprises spot welding and splicing, the head parts and the connecting part are fixed by using a general tool, then the head parts and the connecting part are spot welded, and then the product after spot welding is spliced to obtain the thin-wall special-shaped part.

9. The method of claim 8, wherein the method is used for machining a thin-walled special-shaped part. When the spot welding is performed, the head parts are aligned with the connecting part at the head assembly connection and the connecting part in the middle, so that the straight edges are aligned when welding.

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