Metal part machining method and metal part

Abstract

The invention relates to the technical field of workpiece machining, and discloses a metal part machining method and a metal part. The metal part machining method comprises the following steps that S1, a metal blank is machined into a primary blank, the primary blank is provided with a main body part, a thinning part formed on the side edge of the main body part and an auxiliary part protruding and extending from the side edge, away from the main body part, of the thinning part in the thickness direction, and the thinning part corresponds to the shape of the product and is sunken between the auxiliary part and the main body part; s2, a mold with a forming cavity inside is used for bending the initial blank; and S3, the initial blank is machined to remove the auxiliary part, and a product is formed. The auxiliary part is additionally arranged, the thinned part is sunken relative to the auxiliary part and the main body part, and during bending treatment, a mold is in direct contact with the auxiliary part and the main body part instead of being in contact with and extruding the thinned part, so that the stress position of an initial blank is changed, the product structure is not affected after a final product is formed, and the product quality is improved. And the completeness of the product appearance is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece processing, and particularly relates to a method for processing metal parts and metal parts. Background Art

[0002] The alloy forging and pressing processing technology is one of the core processes in the high-end manufacturing field. Its process types are mainly divided into hot forging and cold forging. Hot forging softens materials through high temperature and can process large-size high-strength components; cold forging is used for materials such as aluminum alloys, and through precision forming, high surface accuracy of complex structural components such as electronic product casings and a material utilization rate of more than 90% can be achieved.

[0003] In terms of the material system, titanium alloys, with their high specific strength and strong corrosion resistance, have achieved the integrated forming of ten-thousand-ton rapid forging of 20-ton vacuum melting ingots and are widely used in aeroengine blades and landing gears, etc. Superalloys use die forging technology to control grain refinement to ensure the stability of gas turbine disks under the working condition of 800 °C. Aluminum alloy forgings have achieved breakthroughs in the lightweight field in various fields through forging + CNC (Computer Numerical Control) composite processing.

[0004] Due to the large toughness of existing titanium alloy materials, slow CNC cutting processing, and short tool wear life, for this reason, some titanium alloy workpieces are no longer subjected to finish machining after bending (referring to bending or flattening through pressure). The bending of workpieces is usually achieved by using a mold to extrude the workpiece. When the mold bends the workpiece, the inner and outer R-angle areas of the workpiece are vertically impacted by the mold parts and are formed from a plane to an arc surface, and the overall thickness of the workpiece will become thinner by 0.02 - 0.03 mm. And some workpieces have parts that are significantly thinner than the main body, resulting in a stepped part with a height difference between the surface where it is located and the surface of the main body part. The shape of the mold is adapted to and fixed with the shape of the workpiece, which causes varying degrees of imprints to appear on the surface of the stepped part of the workpiece in contact with the mold after bending. The imprints are pressed out by the stepped structure of the mold adapted to the stepped part. After sandblasting and anodizing, the imprints result in a poor appearance effect and affect the quality of the workpiece; and it is difficult to repair the imprints using CNC, so it is basically very difficult to remove the imprints. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide a method for processing metal parts and metal parts to solve the problem of imprints generated during the existing bending process.

[0006] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a method for processing metal parts and metal parts, including the following steps:

[0007] S1. Process a metal blank to form a preliminary blank. The preliminary blank is processed with a main body part, a thinning part formed on the side edge of the main body part and thinner than the main body part, and an auxiliary part protruding convexly from the side of the thinning part away from the main body part along the thickness direction. The thinning part is set corresponding to the product shape and is recessed between the auxiliary part and the main body part.

[0008] S2. Use a mold with a forming cavity inside to perform a bending process on the preliminary blank.

[0009] S3. Process the preliminary blank to remove the auxiliary part to form a product.

[0010] Further, in the step S1: The two side surfaces of the auxiliary part along the thickness direction are respectively flush with the two side surfaces of the main body part along the thickness direction to form contact surfaces. The two side surfaces of the thinning part along the thickness direction are configured as thinning surfaces, and the two thinning surfaces are respectively recessed relative to the two contact surfaces.

[0011] Further, in the step S1: The main body part is processed with a first part and a second part extending away from the first part along one side of the width direction of the first part. The thinning part is formed along the side edge of the second part.

[0012] Further, in the step S1: The auxiliary part is processed into an arc shape along the side edge of the thinning part.

[0013] Further, in the step S1: The thinning part forms a fan-shaped area with a uniform bending arc between the auxiliary part and the main body part.

[0014] Further, in the step S2: The shape of the forming cavity is adapted to the product and is configured with a relatively distributed first arc surface and a second arc surface. The middle parts of the first arc surface and the second arc surface are bent in an arc, and the first arc surface and the second arc surface are respectively arranged corresponding to the two contact surfaces.

[0015] Further, the step S2 includes the following sub-steps:

[0016] S21. Place one end of the main body part of the preliminary blank towards the first arc surface and the second arc surface, the other end of the auxiliary part towards the first arc surface and the second arc surface, and the thinning part corresponding to the middle arc-bending part of the first arc surface and the second arc surface.

[0017] S22. Press the mold against the preliminary blank until the two contact surfaces respectively fit against the first arc surface and the second arc surface to complete the bending.

[0018] Further, the step S3 includes the following sub-steps:

[0019] S31. Use the processing equipment to grind the auxiliary part along the thickness direction until it is completely removed;

[0020] S32. Process a bending groove along the thickness direction on the side of the fan-shaped area of the thinning part away from the main body part to form a product.

[0021] Further, the S3 step further includes the following sub-steps:

[0022] S33. Perform sandblasting and anodic treatment on the product.

[0023] The present invention also provides a metal part, and the metal part includes being processed by using the metal part processing method.

[0024] The metal part processing method and the metal part of the present invention at least have the following beneficial effects: By adding an auxiliary part, the thinning part is recessed relative to the auxiliary part and the main body part. When performing the bending process, the mold directly contacts the auxiliary part and the main body part and no longer contacts and extrudes the thinning part, thereby changing the force-bearing position of the initial blank. Thus, while ensuring that the product structure is not affected after the final product is formed, the integrity of the product appearance is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0026] Figure 1 is a flowchart of the metal part processing method of the present invention;

[0027] Figure 2 is a schematic structural diagram of the initial blank in the S1 step of the present invention;

[0028] Figure 3 is a top view of the initial blank in the S1 step of the present invention;

[0029] Figure 4 is a flowchart of the S2 step of the present invention;

[0030] Figure 5 is a processing schematic diagram of the S2 step of the present invention;

[0031] Figure 6 is a flowchart of the S3 step of the present invention;

[0032] Figure 7 is a schematic structural diagram of the metal part of the present invention.

[0033] The meanings of the reference numerals in the drawings are as follows:

[0034] Initial blank 1, main body part 11, first part 111, second part 112, thinning part 12, fan-shaped area 121, inner side 122, outer side 123, thinning surface 124, auxiliary part 13, contact surface 14, curved opening groove 15, mold 2, upper mold 21, lower mold 22, first arc surface 23, second arc surface 24. Detailed implementation manner

[0035] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

[0038] The present invention will be further described below with reference to the drawings.

[0039] Please refer to Figures 1 to 7 , the metal part processing method of the present invention includes the following steps:

[0040] S1. Please refer to Figure 2 and Figure 3 , after processing the metal blank, an initial blank 1 is formed. The initial blank 1 is processed with a main body part 11, a thinning part 12 formed on the side of the main body part 11 and thinner than the main body part 11, and an auxiliary part 13 protruding from the side of the thinning part 12 away from the main body part 11 along the thickness direction. The thinning part 12 is set corresponding to the product shape and is recessed between the auxiliary part 13 and the main body part 11.

[0041] In step S1, the initial blank 1 can be made of a highly ductile titanium alloy material and is initially processed and formed by one of hot forging, casting, stamping, etc. After that, the upper and lower side surfaces and the outer side surface of the blank are milled using a CNC machining device, and then the upper and lower side surfaces of the blank are polished by surface grinding to make them flat, thereby forming the initial blank 1. It should be noted that the blank 1 can also be made of other metals such as aluminum alloy, stainless steel, etc. The material is selected according to the actual application field and is not limited to this embodiment.

[0042] In step S1, the two side surfaces of the auxiliary part 13 along the thickness direction of the initial blank 1 are flush with the two side surfaces of the main body part 11 along the thickness direction of the initial blank 1 to form contact surfaces 14, and the two contact surfaces 14 respectively correspond to the upper and lower side surfaces of the initial blank 1. Among them, the main body part 11 is processed with a first part 111 and a second part 112 that extends from the first part 111 along one side of the width direction of the first part 111 and away from the first part 111. Moreover, the second part 112 extends from the middle position of the side where the first part 111 is located. The dimension of the second part 112 in the direction of the length of the first part 111 (hereinafter simply referred to as the "length direction") is narrower than the dimension of the first part 111, so that the main body part 11 as a whole is in a "T" shape. Among them, the first part 111 is in an overall cuboid block or sheet structure, and the four corners of the first part 111 are all rounded. A secondary arc surface (not shown in the figure) is formed on one side of the first part 111 away from the second part 112. The middle position of the secondary arc surface along the thickness direction is curved towards the second part 112 side, and both ends of the secondary arc surface penetrate the first part 111 along the length direction. The second part 112 protrudes from the middle of the first part 111 and the entire side edge is arc-shaped, and the second part 112 is arranged to gradually narrow from the side close to the first part 111 towards the side away from the first part 111 along the width direction.

[0043] In step S1, the thinning part 12 is formed along the side edges of the second part 112 and is distributed on both side edges of the second part 112 along the long direction and on the side edge of the second part 112 away from the first part 111. Among them, the part of the thinning part 12 located on the side edge of the second part 112 away from the first part 111 has a fan-shaped structure and is configured as a fan-shaped area 121. The fan-shaped area 121 is arranged in an arc around the second part 112 and is distributed in an arc shape. The fan-shaped area 121 is located at the end position of the second part 112 away from the first part 111. The side of the fan-shaped area 121 close to the second part 112 is the inner side edge 122, and the side of the fan-shaped area 121 away from the second part 112 is the outer side edge 123. The auxiliary part 13 is formed along the outer side edge 123 of the thinning part 12 and is also in an arc shape. The inner side edge 122 is narrower than the outer side edge 123, so that the force distribution of the auxiliary part 13 is more uniform relative to the thinning part 12 when the auxiliary part 13 is bent by the extrusion of the mold 2, and the thinning part 12 can be bent into an arc more easily on the premise that the thinning part 12 is not extruded. Among them, the thickness of the thinning part 12 is less than the thickness of the main body part 11 and the auxiliary part 13, and the thinning part 12 is located at the middle position of the main body part 11 and the auxiliary part 13 in the thickness direction. Therefore, the two side surfaces of the thinning part 12 along the thickness direction are configured as thinning surfaces 124, and the two thinning surfaces 124 are respectively recessed relative to the two contact surfaces 14. The width of the auxiliary part 13 can be less than the width of the thinning part 12 to reduce waste and cost, while ensuring the formation of the contact surface 14.

[0044] S2. Please refer to Figure 4 and Figure 5 , and use the mold 2 with a forming cavity inside to bend the initial blank 1.

[0045] In step S2, the mold 2 includes an upper mold 21 and a lower mold 22 which are distributed up and down. Opposite groove bodies are respectively recessed on the opposite side surfaces of the upper mold 21 and the lower mold 22. After the upper mold 21 and the lower mold 22 are buckled together, the two groove bodies jointly enclose the forming cavity. The shape of the forming cavity is adapted to the product and is configured with a relatively distributed first arc surface 23 and a second arc surface 24. The middle parts of the first arc surface 23 and the second arc surface 24 are bent upward in an arc and are consistent with the arc radian of the final product. The first arc surface 23 corresponds to the side surface of the upper mold 21 for forming the forming cavity, and the second arc surface 24 corresponds to the side surface of the lower mold 22 for forming the forming cavity. The first arc surface 23 and the second arc surface 24 are respectively arranged corresponding to the two contact surfaces 14 to be consistent with the arc degrees of the upper and lower side surfaces of the final product. The first arc surface 23 on the upper mold 21 and the second arc surface 24 on the lower mold 22 can be formed in a concave groove-like structure, or can be like Figure 5 shown as only an arc-shaped surface, but as Figure 5 shown, the structure is the simplest and the production of the mold is the easiest.

[0046] Step S2 includes the following sub-steps:

[0047] S21. Orient the main body portion 11 of the preliminary blank 1 towards one end of the first arc surface 23 and the second arc surface 24, and the auxiliary portion 13 towards the other end of the first arc surface 23 and the second arc surface 24, so that one contact surface 14 faces the first arc surface 23, and the other contact surface 14 faces the second arc surface 24. The thinning portion 12 corresponds to the middle arc-bending portion of the first arc surface 23 and the second arc surface 24.

[0048] S22. Press the die 2 against the preliminary blank 1 until the two contact surfaces 14 are respectively attached to the first arc surface 23 and the second arc surface 24 to complete the bending.

[0049] In step S22, during the bending process, move the upper die 21 downward and gradually start pressing the preliminary blank 1 from the second portion 112. Until the first portion 111 and the auxiliary portion 13 of the preliminary blank 1 are gradually bent upward during the extrusion process. Until the contact surfaces 14 are respectively attached to the first arc surface 23 and the second arc surface 24, make the force-bearing surface of the die 2 relative to the contact surface 14 on one surface, and the force applied to the preliminary blank 1 becomes more uniform. Make both the first arc surface 23 and the second arc surface 24 only contact and extrude with the contact surface 14, and avoid the die 2 contacting the thinning portion 12 so that the thinning portion 12 is suspended relative to the die 2, so as to avoid forming a pressing mark on the thinning portion 12. And the die 2 is stressed on one surface, which is more conducive to the formation of the arc.

[0050] S3. Please refer to Figure 6 and Figure 7 , process the preliminary blank 1 to remove the auxiliary portion 13 to form a product.

[0051] Step S3 includes the following sub-steps:

[0052] S31. Use processing equipment to grind the auxiliary portion 13 along the thickness direction until it is completely removed.

[0053] In step S31, the processing equipment is a CNC equipment for machining by cutting. The machining includes removing the auxiliary portion 13 and forming the edge of the final product on the side edge of the thinning portion 12.

[0054] S32. Machine a bending groove 15 along the thickness direction on the outer side edge 123 of the fan-shaped area 121 of the thinning portion 12 away from the main body portion 11 to form a product. Among them, the bending groove 15 is formed at the middle position of the outer side edge 123.

[0055] S33. Perform sandblasting and anodic treatment on the product.

[0056] The metal part of the present invention is processed by the aforementioned metal part processing method, and its shape and size are the same as those of the product in step S33.

[0057] Compared with the prior art, the metal part processing method and the metal part of the present invention change the shape of the traditional blank 1, add an auxiliary part 13 to increase the outer side 123 of the thinning part 12, avoid the thinning part 12 directly contacting the mold 2 during the bending process, and reduce the occurrence of indentation due to extrusion of the thinning part 12. At the same time, the setting of the auxiliary part 13 changes the force application position of the mold 2 on the blank 1. At the same time, the force is made more uniform through the contact surface 14, making the bending process smoother. When using a CNC processing device to remove the auxiliary part 13, the processing object is relatively increased, and the processing difficulty of the product is reduced, thus well ensuring the integrity of the customer's product requirements and improving the quality of the product.

[0058] The above embodiments only represent the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A metal parts processing method, characterized in that: The following steps are involved: S1. Processing a metal blank to form a blank, wherein the blank comprises a main body, a thinning portion formed on a side of the main body and thinner than the main body, and an auxiliary portion protruding from the thinning portion on a side away from the main body in a thickness direction, wherein the thinning portion is arranged corresponding to a product shape and is recessed between the auxiliary portion and the main body; S2, using a mold with a molding cavity inside to bend the blank; S3. Process the blank to remove auxiliary parts to form the product.

2. The metal part processing method according to claim 1, characterized in that: In the S1 step: the two side surfaces of the auxiliary part along the thickness direction are respectively flush with the two side surfaces of the main part along the thickness direction to form a contact surface, and the two side surfaces of the thinned part along the thickness direction are configured as thinning surfaces, and the two thinning surfaces are respectively recessed relative to the two contact surfaces.

3. The metal part processing method according to claim 1 or 2, characterized in that: In the step S1: the main body is processed to include a first portion and a second portion extending from a side edge of the first portion along the width direction and facing away from the first portion, and the thinned portion is formed along the side edge of the second portion.

4. The metal part processing method according to claim 2, characterized in that: In the step S1: the auxiliary portion is processed into an arc shape along the side of the thinned portion.

5. The metal part processing method according to claim 4, characterized in that: In the step S1: the thinned portion is processed to form a fan-shaped area with a uniform curvature between the auxiliary portion and the main portion.

6. The metal part processing method according to claim 2, characterized in that: In the step S2: the shape of the molding cavity is adapted to the product and is provided with a first arcuate surface and a second arcuate surface which are relatively distributed, the first arcuate surface and the second arcuate surface are curved in the middle, and the first arcuate surface and the second arcuate surface are arranged corresponding to two contact surfaces respectively.

7. The metal part processing method according to claim 6, characterized in that: The S2 step includes the following sub-steps: S21, the main part of the preform faces one end of the first curved surface and the second curved surface, the auxiliary part faces the other end of the first curved surface and the second curved surface, and the thinned part corresponds to the middle curved part of the first curved surface and the second curved surface; S22, pressing the mold against the blank until the two contact surfaces are respectively in contact with the first curved surface and the second curved surface to complete the bending.

8. The metal part processing method according to claim 5, characterized in that: The S3 step includes the following sub-steps: S31. Use processing equipment to grind the auxiliary part along the thickness direction until it is completely removed; S32. A bend groove is machined along the thickness direction on one side of the fan-shaped area of ​​the thinned portion away from the main portion to form a product.

9. The metal part processing method according to claim 5, characterized in that: The S3 step also includes the following sub-steps: S33. Sandblast and anodize the product.

10. A metal part, characterized in that: The method comprises using the metal part processing method as described in any one of claims 1 to 9 for processing.

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