Special-shaped part and machining method thereof

Abstract

According to the special-shaped part and the machining method thereof, the special-shaped part comprises a flange plate, an eccentric column is arranged on the flange plate, a through hole is formed in the eccentric column, and the through hole is provided with an inner polygonal inner wall; a groove is formed in the edge, far away from the eccentric column, of the flange; a plurality of engraved patterns are arranged on the surface of one side of the flange plate. According to the special-shaped part and the machining method thereof, the machining technology of the special-shaped part is improved, the machining procedure is omitted, the forming quality of the special-shaped part is improved, and meanwhile damage to a machining mold is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of special-shaped parts and hardware, and particularly relates to a special-shaped part and a processing method thereof. Background Art

[0002] Fasteners are a type of hardware that is widely used in various industries and plays an excellent role in fastening. As fasteners have developed to date, their structures and functions have also become more diverse to adapt to different usage scenarios.

[0003] For some parts with special-shaped structures, their special structures make it impossible to use general methods to process them. They need to be processed using specially customized methods. Even so, the processing methods of some complex special-shaped parts are relatively cumbersome, with low yield and high cost.

[0004] Based on the above situation, the present invention designs a special-shaped part and an innovative processing method. Summary of the Invention

[0005] In view of the above deficiencies in the prior art, the present invention provides a special-shaped part and a processing method thereof, which improves the processing technology of the special-shaped part, omits the machining process, improves the molding quality of the special-shaped part, and reduces the damage of the processing mold.

[0006] The present invention is solved by the following technical solutions.

[0007] A special-shaped part includes a flange plate, an eccentric column is provided on the flange plate, a through hole is provided on the eccentric column, and the through hole has a polygonal inner wall; a groove is provided on the edge of the flange away from the eccentric column; and a plurality of carvings are provided on one side surface of the flange plate.

[0008] The processing method of the special-shaped parts involved in the present application includes the following steps: S10: cutting: cutting the cylindrical metal raw material into a specified length to obtain a blank; S20: cold extruding the blank to form a flange structure 1 and an eccentric eccentric cylindrical structure, forming a lead hole on the eccentric cylindrical structure, and forming a mold positioning hole on the flange structure 1; the diameter of the flange structure 1 is larger than the diameter of the eccentric cylindrical structure; S30: further forming the flange structure 1 into a flange structure 2 that is thinner and larger in area by cold extrusion, and forming the lead hole into a deeper upset lead hole by cold extrusion, and the process increases the height of the eccentric cylindrical structure; S40: further forming a trimming edge outside a part of the edge of the flange structure 2 by cold extrusion, and forming a groove on the side of the flange structure 2 away from the eccentric cylindrical structure; S50: cutting off the trimming edge; S60: further forming the lead hole through the mold positioning hole by cold extrusion to form a through hole.

[0009] Furthermore, the method further includes the following steps: S70: forming an inner polygonal inner wall on the inner wall of the through hole through a cold extrusion molding operation.

[0010] Furthermore, the method further includes the following steps: S80, the edge of the upset hole has a chamfered structure, and the chamfered structure is formed into a step structure through a cold extrusion operation.

[0011] Compared with the prior art, the present invention has the following beneficial effects: providing a special-shaped part and a processing method thereof, improving the processing technology of the special-shaped part, omitting the machining process, improving the molding quality of the special-shaped part, and reducing the damage of the processing mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the special-shaped parts in the present invention.

[0013] Figure 2 It is a cross-sectional view of the special-shaped part in the present invention.

[0014] Figure 3 Schematic diagram of the process from state 1 to state 2 of processing a special-shaped part in one embodiment.

[0015] Figure 4 Schematic diagram of state 3 to state 4 of processing special-shaped parts in one embodiment.

[0016] Figure 5 Schematic diagram of state 5 to state 6 of processing special-shaped parts in one embodiment. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the following embodiments, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention. In addition, the terms: first, second, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. In the description of the present invention, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0020] See also Figures 1 to 5 The present application relates to a special-shaped part, which includes a flange 2, an eccentric column 1 is provided on the flange 2, a through hole 11 is provided on the eccentric column 1, and the through hole 11 has an inner polygonal inner wall 12; a groove 21 is provided on the edge of the flange 2 away from the eccentric column 1; and a plurality of carvings 22 are provided on one side surface of the flange 2.

[0021] The processing method of the special-shaped part comprises the following steps.

[0022] S10: Cutting: Cutting the cylindrical metal raw material into specified lengths to obtain blanks.

[0023] S20: The blank is cold-extruded to form a flange structure 41 and an eccentric cylindrical structure 31, a guide hole 32 is formed on the eccentric cylindrical structure 31, and a mold positioning hole 42 is formed on the flange structure 41; the diameter of the flange structure 41 is larger than the maximum diameter of the eccentric cylindrical structure 31.

[0024] S30: further through cold extrusion operation, the flange structure 1 41 is formed into a flange structure 2 411 which is thinner and larger in area, and the lead hole 32 is formed into a deeper upset lead hole 322 , and this process increases the height of the eccentric cylindrical structure 31 .

[0025] S40 : further forming a trimming edge 415 on a portion of the edge of the second flange structure 411 through a cold extrusion operation, and forming a groove 21 on a side of the second flange structure 411 away from the eccentric cylindrical structure 31 .

[0026] S50: Cutting off the trimming edge 415.

[0027] S60 : further performing a cold extrusion operation to penetrate the lead hole 32 to the mold positioning hole 42 to form a through hole 11 .

[0028] S70: forming an inner polygonal inner wall 12 on the inner wall of the through hole 11 through a cold extrusion forming operation.

[0029] S80, the edge of the upset hole 322 has a chamfered structure, and the chamfered structure is formed into a step structure 325 through a cold extrusion operation.

[0030] The following is an example of a specific processing method in this application.

[0031] The first step: cutting, cutting the cylindrical metal raw material into specified lengths to obtain blanks.

[0032] Step 2: The blank is cold extruded to form a flange structure 41 and an eccentric cylindrical structure 31. The height of the eccentric cylindrical structure 31 protruding from the flange structure 41 is 7.6 mm, and a lead hole 32 is formed on the eccentric cylindrical structure 31. The minimum diameter of the eccentric cylindrical structure 31 is 34 mm, and the diameter of the flange structure 41 is 45 mm.

[0033] In addition, a mold positioning hole 42 with a diameter of 16 mm is formed on the other side of the flange structure 1 41. The mold positioning hole 42 is a conical structure with a conical angle of 150° in its cross section.

[0034] Overall, the thickness of the prefabricated part is 21.3 mm, and the diameter of the flange structure 41 is larger than the maximum diameter of the eccentric cylindrical structure 31.

[0035] Step 3: Continue to extrude and deform along the lead hole 32 to make it into a lead hole with a diameter of 22.8 mm and a depth of 3.6 mm. The eccentric cylindrical structure 31 is subjected to a second die cold extrusion to reduce its diameter.

[0036] The structure of this state is as follows Figure 3 The left state in Figure 1 As shown, the status Figure 1 The middle part is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0037] Step 4: Based on the third step, the flange structure 1 41 is cold extruded to form the flange structure 1 41 into a flange structure 2 411 which is thinner and larger in area. The formed flange structure 2 411 has a protrusion 4111 protruding outward on the side away from the eccentric cylindrical structure 31. The maximum outer diameter of the flange structure 2 411 is 53.2 mm, and the minimum outer diameter in the vertical direction of the maximum outer diameter is 50 mm. That is, the flange structure 2 411 is an eccentric flange preformed structure. After extrusion, the thickness of the flange structure 2 411 is 5.7 mm, and there is a transition R angle at the junction with the eccentric cylindrical structure 31.

[0038] The structure of this state is as follows Figure 3The right side state Figure 2 As shown, the status Figure 2 The middle part is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0039] Step 5: Continue extrusion deformation to form the lead hole 32 into a deeper upset lead hole 322, and extrude the overall thickness of the prefabricated part to 18.7 mm. The shortest outer diameter of the eccentric cylindrical structure 31 is 34.6 mm, that is, this process increases the height of the eccentric cylindrical structure 31.

[0040] The structure of this state is as follows Figure 4 The left state in Figure 3 As shown, the status Figure 3 The middle part is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0041] Step 6: Through cold extrusion with the fourth die, the chamfered structure at the edge of the upsetting hole 322 is formed into a step structure 325. The maximum inner diameter of the step structure 325 is 19.15 mm. At this time, the inner diameter of the upsetting hole 322 is 15.9 mm, and the depth of the upsetting hole 322 is 12.5 mm (including the 4 mm depth of the step structure 325).

[0042] Step 7: By squeezing the protrusion 4111 on the flange, a groove 21 trimming edge 415 is formed on the side of the second flange structure 411 away from the eccentric cylindrical structure 31 , and the groove 21 is a V-shaped groove.

[0043] The structure of this state is as follows Figure 4 The right side state Figure 4 As shown, the status Figure 4 The middle part is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0044] Step 8: The upset hole 322 is penetrated by cold extrusion to form a through hole 11 with an inner diameter of 15.9 mm, and then the trimming edge 415 is cut off by a die trimming machine to retain the V-shaped groove 21.

[0045] The structure of this state is as follows Figure 5 The left state in Figure 5 As shown, the status Figure 5 The middle part is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0046] Step 9: Continue cold extrusion molding to shape the inner wall of the first through hole 11 into an inner polygonal inner wall 12, such as a pentagonal inner wall, and then use the sixth die to cold extrude to form the engraving 22 to complete the production of the part.

[0047] The structure of this state is as follows Figure 5 As shown in the state diagram on the right, the middle of the state diagram is a cross-sectional view, and the upper and lower parts are schematic diagrams of the two surfaces.

[0048] From the above description, it can be seen that the processing method of the special-shaped parts in the present invention adopts a cold extrusion method, which effectively avoids the quality defects caused by hot forming and omits the machining process. In order to avoid mold cracking, the present invention first compresses the wire material to be processed into rods of different diameters, and releases the pressure through each mold while cold extruding to discharge the gas and oil in the mold to avoid mold cracking. Finally, the remaining material is squeezed and perforated to complete the processing of the special-shaped parts. Through the segmented processing of the lead hole, rod, flange, perforation, and engraving, stress concentration during the overall extrusion is avoided, which causes the membrane core of the processing mold to crack. The manufacturing process method and mold of the present invention make the process simple, the quality stable, the cost saved, and the production efficiency improved.

[0049] As described above, the present invention provides a special-shaped part and a processing method thereof, which improves the processing technology of the special-shaped part, omits the machining process, improves the molding quality of the special-shaped part, and reduces the damage of the processing mold.

[0050] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by those skilled in the art fall within the protection scope of the present invention.

Claims

1. A special-shaped part, characterized in that: The special-shaped part comprises a flange (2), an eccentric column (1) is provided on the flange (2), a through hole (11) is provided on the eccentric column (1), and the through hole (11) has a polygonal inner wall (12); A groove (21) is provided on the edge of the flange (2) away from the eccentric column (1); A plurality of carvings (22) are provided on one side surface of the flange (2).

2. The method for processing special-shaped parts according to claim 1, characterized in that: The following steps are involved: S10: Cutting: Cutting the cylindrical metal raw material into specified lengths to obtain blanks; S20: cold extruding the blank to form a flange structure (41) and an eccentric cylindrical structure (31), wherein a guide hole (32) is formed on the eccentric cylindrical structure (31), and a mold positioning hole (42) is formed on the flange structure (41); the diameter of the flange structure (41) is larger than the diameter of the eccentric cylindrical structure (31); S30: further forming the flange structure 1 (41) into a flange structure 2 (411) which is thinner and larger in area by cold extrusion, forming the lead hole (32) into a deeper upset lead hole (322) by cold extrusion, and increasing the height of the eccentric cylindrical structure (31); S40: further forming a trimming edge (415) on a portion of the edge of the second flange structure (411) through a cold extrusion operation, and forming a groove (21) on a side of the second flange structure (411) away from the eccentric cylindrical structure (31); S50: cutting and trimming the edge (415); S60: Further through a cold extrusion operation, the lead hole (32) is penetrated to the mold positioning hole (42) to form a through hole (11).

3. The method for processing special-shaped parts according to claim 2, characterized in that: The following steps are also included: S70: forming an inner polygonal inner wall (12) on the inner wall of the through hole (11) through a cold extrusion forming operation.

4. The method for processing special-shaped parts according to claim 3, characterized in that: The following steps are also included: S80, the edge of the upset hole (322) has a chamfered structure, and the chamfered structure is formed into a step structure (325) through a cold extrusion forming operation.

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