Die and inner hole step thin-wall pipe fitting for automobile chassis
By using a continuous cold extrusion deformation process with six-station molds, thin-walled tubular components with stepped inner holes in automotive chassis can be directly cold-forged, solving the problems of slow production speed and high cost in existing technologies and achieving efficient and low-cost production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-24
AI Technical Summary
In the existing technology, the production speed of thin-walled tubular components with stepped inner holes in automobile chassis is slow, the material utilization rate is low, and the production cost is high.
The continuous cold heading process using six-station molds achieves direct cold heading of thin-walled tubes with internal stepped holes through the combination of end face shaping mold, positioning hole drilling mold, pre-forming mold, step tail hole drilling mold and final forming mold.
It reduces production steps, improves production efficiency, lowers production costs, and ensures product size consistency and improved mechanical performance.
Smart Images
Figure CN224026387U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile parts, especially to a die and inner hole step thin wall pipe fitting for automobile chassis. BACKGROUND
[0002] At present, the automobile industry is developing towards light weight, and the wall pipe connecting sleeve used by the automobile chassis is also designed to be thinner and thinner. As the inner hole step thin wall pipe fitting used by the automobile chassis, although the wall thickness is about 3mm, the outer diameter is 44mm, the large hole is 38mm, and the outer diameter is only 1.15 to 1.16 times of the large hole. The wall thickness is very thin for the product. At present, this kind of thin wall pipe fitting is mainly obtained by the processing technology of solid blank + phosphating treatment + stamping forming thin wall + CNC end face + CNC small hole, but the production speed of this kind of processing mode is slow, the material utilization rate is low, and the production cost is high. SUMMARY
[0003] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a die and inner hole step thin wall pipe fitting for automobile chassis, which is directly cold upsetting formed by continuous cold extrusion deformation of six station dies, reduces the production process, improves the production efficiency and reduces the production cost.
[0004] According to the die provided by the utility model, the die comprises:
[0005] The end face shaping die comprises a first shaping die and a second shaping die, the first shaping die is used for shaping one end face of the blank, and the second shaping die is used for shaping the other end face of the blank to obtain a shaped blank;
[0006] The positioning hole die is used for punching a first positioning hole and a second positioning hole on the two ends of the shaped blank respectively to obtain a positioning hole blank;
[0007] The preforming die is used for punching a large hole to form a thin wall on the basis of the first positioning hole and punching a small hole on the basis of the second positioning hole of the positioning hole blank to obtain a preformed blank;
[0008] The step tail hole die is used for punching a step tail hole corresponding to the small hole on the bottom wall of the large hole of the preformed blank and flattening the hole bottom of the large hole to obtain a step tail hole blank;
[0009] The final forming die is used for removing the waste material between the step tail hole and the small hole of the step tail hole blank and pressing the end face to control the length to obtain a finished product.
[0010] According to the die provided by the utility model, at least the following beneficial effects are obtained:
[0011] The inner hole step thin-wall pipe is directly cold upsetting formed by six station die continuous cold extrusion deformation, and the inner hole step and the thin wall are directly formed. The inner hole step thin-wall pipe formed by low carbon steel directly cold upsetting is a finished product and does not need additional processing. The processing procedure is reduced, the production efficiency is improved, and the production cost is saved. The cold upsetting production process is stable, and only one operator is needed to operate the production line. The inner hole step thin-wall pipe directly produced by cold upsetting can guarantee the consistency of the product size because the forming size is controlled by the die. The complete metal flow line can be reserved in the cold upsetting process, and the mechanical properties of the inner hole step thin-wall pipe are obviously improved and the product quality is obviously improved.
[0012] According to some embodiments of the utility model, the first shaping die includes a first upper die and a first lower die, the first upper die is arranged above the first lower die, a first upper punch is arranged on the first upper die, a first main die, a first lower punch and an elastic member are arranged on the first lower die, a first cavity for placing a blank is arranged in the first main die, a first through hole for the first lower punch to extend into is arranged on the bottom wall of the first cavity, the elastic member is arranged below the first lower punch, the elastic member is used for pushing the first lower punch to extend into the first cavity, the first lower punch is used for supporting the blank and pushing the blank out of the first cavity, and the first upper punch is used for extending into the first cavity to cooperate with the first main die and the first lower punch to shape one end face of the blank.
[0013] According to some embodiments of the utility model, the second shaping die includes a second upper die and a second lower die, the second upper die is arranged above the second lower die, a second upper punch is arranged on the second upper die, a second main die and a second lower punch are arranged on the second lower die, a second cavity for placing the blank is arranged in the second main die, a second through hole for the second lower punch to extend into is arranged on the bottom wall of the second cavity, the second lower punch is used for supporting the blank and pushing the shaped blank out of the second cavity, and the second upper punch is used for extending into the second cavity to cooperate with the second main die and the second lower punch to shape the other end face of the blank, thereby obtaining the shaped blank.
[0014] According to some embodiments of the utility model, the positioning hole punching die includes a third upper die and a third lower die, the third upper die is arranged above the third lower die, a third upper punch rod is arranged on the third upper die, a first positioning protrusion for punching out the first positioning hole is arranged on the third upper punch rod, a third main die and a third lower punch rod are arranged on the third lower die, a second positioning protrusion for punching out the second positioning hole is arranged on the third lower punch rod, a third cavity for placing the shaped blank is arranged in the third main die, a third through hole for the third lower punch rod to extend into is arranged on the bottom wall of the third cavity, the third lower punch rod is used for supporting the shaped blank and pushing the positioning hole punched blank out of the third cavity, the third upper punch rod is used for extending into the third cavity to cooperate with the third main die and the third lower punch rod to punch out the first positioning hole and the second positioning hole at two ends of the shaped blank respectively, and thus the positioning hole punched blank is obtained.
[0015] According to some embodiments of the utility model, the preforming die includes a fourth upper die and a fourth lower die, the fourth upper die is arranged above the fourth lower die, a fourth upper punch rod and a first upper push tube are arranged on the fourth upper die, a fourth main die, a fourth lower punch rod and a first lower push tube are arranged on the fourth lower die, a fourth cavity for placing the positioning hole punched blank is arranged in the fourth main die, a fourth through hole for the fourth lower punch rod to extend into is arranged on the bottom wall of the fourth cavity, the fourth lower punch rod is used for supporting the positioning hole punched blank, the fourth upper punch rod is used for extending into the fourth cavity to cooperate with the fourth main die and the fourth lower punch rod to punch out a large hole and a small hole on the basis of the second positioning hole, and thus the preformed blank is obtained.
[0016] The first upper push tube is slidably arranged on the fourth upper punch rod, and the first upper push tube is used for pushing the preformed blank out of the fourth upper punch rod, the first lower push tube is slidably arranged on the fourth lower punch rod, and the first lower push tube is used for pushing the preformed blank out of the fourth lower punch rod.
[0017] According to some embodiments of the utility model, the depth of the fourth cavity is less than the length of the preformed blank.
[0018] According to some embodiments of the utility model, the stepped tail hole die includes fifth upper die and fifth lower die, fifth upper die is located above fifth lower die, fifth upper die is provided with fifth upper punch rod and second upper push tube, the lower end of fifth upper punch rod is provided with tail hole convex for punching out the stepped tail hole, fifth lower die is provided with fifth main die, fifth lower punch rod and second lower push tube, fifth main die is provided with fifth cavity for placing preform, the bottom wall of fifth cavity is provided with fifth through hole for fifth lower punch rod to extend into, fifth lower punch rod is used for supporting preform, fifth upper punch rod is used for extending into fifth cavity to cooperate with fifth main die and fifth lower punch rod to punch the stepped tail hole on preform and flatten the hole bottom of large hole to obtain stepped tail hole blank;
[0019] The second upper push tube is slidably sleeved on the fifth upper punch rod, and the second upper push tube is used for pushing the stepped tail hole blank out of the fifth upper punch rod.
[0020] The depth of the fifth cavity is less than the length of the stepped tail hole blank.
[0021] According to some embodiments of the utility model, the final forming die includes sixth upper die and sixth lower die, sixth upper die is located above sixth lower die, sixth upper die is provided with sixth upper punch rod and third upper push tube, sixth lower die is provided with sixth main die, sixth lower punch rod and third lower push tube, sixth main die is provided with sixth cavity for placing stepped tail hole blank, the bottom wall of sixth cavity is provided with sixth through hole for sixth lower punch rod to extend into, sixth lower punch rod is used for supporting stepped tail hole blank, sixth upper punch rod is provided with seventh through hole for sixth lower punch rod to extend into, sixth upper punch rod is used for extending into sixth cavity to cooperate with sixth main die and sixth lower punch rod to remove waste between the stepped tail hole and the small hole of stepped tail hole blank and press the end face to control the length to obtain finished product.
[0022] The third upper push tube is slidably sleeved on the sixth upper punch rod, and the third upper push tube is used for pushing the finished product out of the sixth upper punch rod.
[0023] According to some embodiments of the utility model, an inner hole stepped thin-walled pipe fitting for automobile chassis comprises a pipe body, the pipe body is provided with a large hole and a small hole in communication, the axial direction of the large hole and the small hole is consistent with the axial direction of the pipe body.
[0024] The thin-walled tube with stepped inner bore for automotive chassis according to embodiments of this utility model has at least the following beneficial effects: The thin-walled tube with stepped inner bore is directly cold-forged into an inner bore step and thin wall through continuous cold extrusion deformation using six-station dies. The thin-walled tube with stepped inner bore, produced by direct cold forging of low-carbon steel, is a finished product in itself, requiring no additional processing. This reduces processing steps, improves production efficiency, and saves production costs. The cold forging process is stable, requiring only one operator to run the production line. Since the forming dimensions of the thin-walled tube with stepped inner bore produced directly by cold forging are controlled by dies, product dimensional consistency is guaranteed. The complete metal flow lines are preserved during the cold forging process, and the work hardening of the metal significantly improves the mechanical properties and product quality of the thin-walled tube with stepped inner bore.
[0025] According to some embodiments of this utility model, the ratio of the diameter of the tube body to the diameter of the large hole is in the range of 1.15-1.16.
[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows. Attached Figure Description
[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0028] Figure 1 This is a flowchart illustrating the processing of a thin-walled tube with an inner bore step for an automobile chassis, according to an embodiment of this utility model.
[0029] Figure 2 This is a cross-sectional view of a thin-walled tube with an inner bore step for an automobile chassis, according to an embodiment of the present invention.
[0030] Figure 3 This is a schematic diagram of the structure of the first forming mold in the mold of this utility model embodiment;
[0031] Figure 4 This is a schematic diagram of the structure of the second forming mold in the mold of this utility model embodiment;
[0032] Figure 5 This is a schematic diagram of the positioning hole die in the mold of this utility model embodiment;
[0033] Figure 6 This is a schematic diagram of the structure of the preforming mold in the mold of this utility model embodiment;
[0034] Figure 7 This is a schematic diagram of the structure of the step-hole die in the mold of this utility model embodiment;
[0035] Figure 8 This is a schematic diagram of the final forming mold in an embodiment of the present invention;
[0036] Figure 9 Structure diagram of the inner hole step thin-wall pipe fitting for automobile chassis Figure 1 ;
[0037] Figure 10 Structure diagram of the inner hole step thin-wall pipe fitting for automobile chassis Figure 2 .
[0038] Reference signs:
[0039] 100, first shaping die; 110, first upper die; 111, first upper punch rod; 120, first lower die; 121, first main die; 122, first lower punch rod; 123, elastic member;
[0040] 200, second shaping die; 210, second upper die; 211, second upper punch rod; 220, second lower die; 221, second main die; 222, second lower punch rod;
[0041] 300, positioning hole punching die; 310, third upper die; 311, third upper punch rod; 3111, first positioning protrusion; 320, third lower die; 321, third main die; 322, third lower punch rod; 3221, second positioning protrusion;
[0042] 400, pre-forming die; 410, fourth upper die; 411, fourth upper punch rod; 412, first upper push tube; 420, fourth lower die; 421, fourth main die; 422, fourth lower punch rod; 423, first lower push tube;
[0043] 500, step tail hole punching die; 510, fifth upper die; 511, fifth upper punch rod; 5111, tail hole protrusion; 512, second upper push tube; 520, fifth lower die; 521, fifth main die; 522, fifth lower punch rod; 523, second lower push tube;
[0044] 600, final forming die; 610, sixth upper die; 611, sixth upper punch rod; 6111, seventh through hole; 612, third upper push tube; 620, sixth lower die; 621, sixth main die; 622, sixth lower punch rod; 623, third lower push tube;
[0045] 700, pipe body; 710, large hole; 720, small hole;
[0046] a, blank; b, shaped blank; c, positioning hole punched blank; d, pre-formed blank; e, step tail hole punched blank; f, finished product. DETAILED DESCRIPTION
[0047] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and should not be understood as a limitation of the present application.
[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.
[0049] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0050] Please refer to Figure 1 and Figure 2The utility model embodiment relates to a kind of mould, including end face shaping mould, punch positioning hole mould 300, preforming mould 400, punch step tail hole mould 500 and final forming mould 600.Disc round material is conveyed to cutting device after correction by cold heading corrector, after material is cut by mould, clamping device is automatically clamped and conveys cut material to forming mould mouth (first cavity).End face shaping mould includes first shaping mould 100 and second shaping mould 200, first shaping mould 100 is used to shape one end face of feed blank a, and second shaping mould 200 is used to shape another end face of feed blank a to obtain shaped blank b.Punch positioning hole mould 300 is used to punch first positioning hole and second positioning hole on the two ends of shaped blank b respectively to obtain positioning hole blank c.Preforming mould 400 is used to punch large hole 710 on the basis of first positioning hole to form thin wall and punch small hole 720 on the basis of second positioning hole to obtain preforming blank d.Punch step tail hole mould 500 is used to punch step tail hole corresponding with small hole 720 on the bottom wall of large hole 710 in preforming blank d and flatten the hole bottom of large hole 710 to obtain punch step tail hole blank e.Final forming mould 600 is used to remove waste between step tail hole and small hole 720 of punch step tail hole blank e and control length by pressing end face to obtain finished product f.
[0051] The inner hole step thin-wall pipe is directly cold-headed and formed into inner hole step and thin wall by continuous cold extrusion deformation of six stations of moulds. The inner hole step thin-wall pipe produced by directly cold-heading and forming with low-carbon steel is the finished product f itself, and does not need additional processing. The processing procedure is reduced, the production efficiency is improved, and the production cost is saved. The cold-heading production process is stable, and only one operator is needed to operate the production line. The inner hole step thin-wall pipe directly produced by cold-heading can ensure the consistency of product size, because the forming size is controlled by mould. The complete metal flow line can be kept in the process of cold-heading, and the mechanical properties of the inner hole step thin-wall pipe are obviously improved and the product quality is obviously improved due to the cold work hardening of metal.
[0052] In some embodiments, refer to Figure 1 and Figure 3, the first shaping die 100 comprises a first upper die 110 and a first lower die 120, the first upper die 110 is arranged above the first lower die 120, and the first upper die 110 is reciprocable up and down relative to the first lower die 120. The first upper die 110 is provided with a first upper punch 111, and the first lower die 120 is provided with a first main die 121, a first lower punch 122 and an elastic piece 123. The first main die 121 is internally provided with a first cavity, and a preform a can be placed in the first cavity. A bottom wall of the first cavity is provided with a first through hole, and the first lower punch 122 extends into the first cavity from the first through hole. The elastic piece 123 is arranged below the first lower punch 122, and the elastic piece 123 is used for pushing the first lower punch 122 to extend into the first cavity. The first lower punch 122 is used for supporting the preform a and pushing the preform a out of the first cavity, and the first upper punch 111 is used for extending into the first cavity to cooperate with the first main die 121 and the first lower punch 122 to shape one end face of the preform a. In work, the preform a is placed in the first cavity, the first lower punch 122 supports the preform a, the first upper die 110 descends, the first upper punch 111 extends into the first cavity, the first upper punch 111, the first lower punch 122 and the first main die 121 extrude the preform a, and one end face of the preform a is shaped. The first upper die 110 drives the first upper punch 111 to come out of the first cavity, and the first lower punch 122 is pushed out of the first cavity by the lower push rod.
[0053] In some embodiments, referring to Figure 1 and Figure 4 , the second shaping die 200 comprises a second upper die 210 and a second lower die 220, the second upper die 210 is arranged above the second lower die 220, and the second upper die 210 is reciprocable up and down relative to the second lower die 220. The second upper die 210 is provided with a second upper punch 211, and the second lower die 220 is provided with a second main die 221 and a second lower punch 222. The second main die 221 is internally provided with a second cavity, and the second cavity is used for placing a preform a. A bottom wall of the second cavity is provided with a second through hole, and the second lower punch 222 extends into the second cavity from the second through hole. The second lower punch 222 is used for supporting the preform a and pushing a shaped preform b out of the second cavity, and the second upper punch 211 is used for extending into the second cavity to cooperate with the second main die 221 and the second lower punch 222 to shape the other end face of the preform a, thereby obtaining the shaped preform b. The second shaping die 200 is located behind the first shaping die 100 in the process. After the first shaping die 100 shapes one end face of the preform a, the preform a is flipped and then placed in the second cavity. The second upper die 210 drives the second upper punch 211 to descend, the second lower punch 222 extends into the second cavity, the second lower punch 222, the second upper punch 211 and the second main die 221 shape the other end face of the preform a, thereby obtaining the shaped preform b. The second upper die 210 drives the second upper punch 211 to come out of the second cavity, and the second lower punch 222 is pushed out of the second cavity by the lower push rod.
[0054] In some embodiments, referring to Figure 1 and Figure 5 , the positioning hole die 300 comprises a third upper die 310 and a third lower die 320, the third upper die 310 is arranged above the third lower die 320, and the third upper die 310 is reciprocally movable up and down relative to the third lower die 320. The third upper die 310 is provided with a third upper punch rod 311, and the third upper punch rod 311 is provided with a first positioning protrusion 3111 for punching a first positioning hole on one end face of the shaped blank b. The third lower die 320 is provided with a third main die 321 and a third lower punch rod 322, and the third lower punch rod 322 is provided with a second positioning protrusion 3221 for punching a second positioning hole on the other end face of the shaped blank b. The third main die 321 is provided with a third cavity for placing the shaped blank b. The bottom wall of the third cavity is provided with a third through hole for the third lower punch rod 322 to extend into, and the third lower punch rod 322 is used to support the shaped blank b and push the positioning hole blank c out of the third cavity. The third upper punch rod 311 is used to extend into the third cavity to cooperate with the third main die 321 and the third lower punch rod 322 to punch the first positioning hole and the second positioning hole on the two ends of the shaped blank b respectively, thereby obtaining the positioning hole blank c. The positioning hole die 300 is located in the rear process of the second shaping die 200, the shaped blank b is placed in the third cavity, the third upper die 310 drives the third upper punch rod 311 to descend, the third lower punch rod 322 extends into the third cavity, the third lower punch rod 322, the third upper punch rod 311 and the third main die 321 extrude the shaped blank b, the first positioning protrusion 3111 extrudes the first positioning hole on one end face of the shaped blank b, the second positioning protrusion 3221 extrudes the second positioning hole on the other end face of the shaped blank b, thereby obtaining the positioning hole blank c. The third upper die 310 drives the third upper punch rod 311 to be withdrawn from the third cavity, and the third lower punch rod 322 is pushed out of the third cavity by the lower push rod.
[0055] In some embodiments, referring to Figure 1 and Figure 6The preforming die 400 includes a fourth upper die 410 and a fourth lower die 420. The fourth upper die 410 is arranged above the fourth lower die 420 and can reciprocate up and down relative to the fourth lower die 420. The fourth upper die 410 is provided with a fourth upper punch 411 and a first upper push tube 412. The fourth lower die 420 is provided with a fourth main die 421, a fourth lower punch 422, and a first lower push tube 423. The fourth main die 421 is provided with a fourth cavity for placing the positioning hole blank c. The bottom wall of the fourth cavity is provided with a fourth through hole for the fourth lower punch 422 to extend into. The fourth lower punch 422 is used to support the positioning hole blank c. The fourth upper punch 411 is used to extend into the fourth cavity to cooperate with the fourth main die 421 and the fourth lower punch 422 to punch the large hole 710 of the positioning hole blank c to form a thin wall and punch the small hole 720 based on the second positioning hole, thereby obtaining the preformed blank d. The first upper push tube 412 is slidably arranged on the fourth upper punch 411 and is used to push the preformed blank d out of the fourth upper punch 411. The first lower push tube 423 is slidably arranged on the fourth lower punch 422 and is used to push the preformed blank d out of the fourth lower punch 422.
[0056] The preforming die 400 is located behind the positioning hole die 300. The positioning hole blank c is placed in the fourth cavity. The fourth upper die 410 drives the fourth upper punch 411 and the fourth upper push tube to descend. The fourth upper punch 411 extends into the fourth cavity (the first positioning hole, corresponding to the fourth lower punch 422 extending into the second positioning hole). The fourth lower punch 422, the fourth upper punch 411, and the fourth main die 421 extrude the positioning hole blank c. The fourth upper punch 411 and the fourth main die 421 extrude the large hole 710 and the thin wall. The fourth lower punch 422 and the fourth main die 421 extrude the small hole 720, thereby obtaining the preformed blank d. The fourth upper die 410 drives the fourth upper punch 411 to come out of the fourth cavity. The first upper push tube 412 is pushed against the upper end surface of the preformed blank d under the action of the upper push rod, so that the fourth upper punch 411 is separated from the preformed blank d. The first lower push tube pushes the preformed blank d out of the fourth lower punch 422 under the action of the lower push rod and ejects it out of the fourth cavity.
[0057] In some embodiments, referring to Figure 1 and Figure 6 , the depth of the fourth cavity is less than the length of the preformed blank d. The large hole 710 is formed with a thin wall. Only part of the large hole 710 remains in the fourth cavity, which can ensure the forming size of the outer circle of the pipe body 700. The upper part of the pipe body 700 is exposed outside the fourth cavity, which can reduce the friction between the outer edge of the pipe body 700 and the inner wall of the fourth cavity.
[0058] In some embodiments, referring to Figure 1 and Figure 7The tail hole step forming die 500 includes a fifth upper die 510 and a fifth lower die 520. The fifth upper die 510 is arranged above the fifth lower die 520 and can reciprocate up and down relative to the fifth lower die 520. The fifth upper die 510 is provided with a fifth upper punch 511 and a second upper push tube 512. The lower end of the fifth upper punch 511 is provided with a tail hole protrusion 5111 for forming a tail hole step. The fifth lower die 520 is provided with a fifth main die 521, a fifth lower punch 522, and a second lower push tube 523. The fifth main die 521 is provided with a fifth cavity for placing the preform d. The bottom wall of the fifth cavity is provided with a fifth through hole for the fifth lower punch 522 to extend into. The fifth lower punch 522 is used to support the preform d. The fifth upper punch 511 is used to extend into the fifth cavity to cooperate with the fifth main die 521 and the fifth lower punch 522 to form a tail hole step on the preform d and press the bottom of the large hole 710 to obtain a tail hole step preform e. The second upper push tube 512 is slidably arranged on the fifth upper punch 511 and is used to push the tail hole step preform e out of the fifth upper punch 511. The second lower push tube 523 is slidably arranged on the fifth lower punch 522 and is used to push the tail hole step preform e out of the fifth lower punch 522.
[0059] The tail hole step forming die 500 is located behind the preforming die 400. The preform d is placed in the fifth cavity. The fifth upper die 510 drives the fifth upper punch 511 and the fifth upper push tube to descend. The fifth upper punch 511 extends into the fifth cavity. The fifth lower punch 522, the fifth upper punch 511, and the fifth main die 521 extrude the preform d. The tail hole protrusion 5111 extrudes a tail hole step in the large hole 710. The fifth upper punch 511 flattens the bottom of the large hole 710, thereby obtaining a tail hole step preform e. The fifth upper die 510 drives the fifth upper punch 511 to disengage from the preform d. The second upper push tube 512 is pushed against the upper end surface of the preform d by the upper push rod, so that the fifth upper punch 511 disengages from the preform d. The second lower push tube pushes the preform d out of the fifth lower punch 522 and ejects it from the fifth cavity under the action of the lower push rod.
[0060] The depth of the fifth cavity is less than the length of the tail hole step preform e. The large hole 710 is formed in a thin wall. Only part of the large hole 710 remains in the fourth cavity, which can ensure the forming size of the outer circle of the pipe body 700. The upper part of the pipe body 700 is exposed from the fourth cavity, which can reduce the friction between the outer edge of the pipe body 700 and the inner wall of the fourth cavity.
[0061] In some embodiments, referring to Figure 1 and Figure 8The final forming die 600 includes a sixth upper die 610 and a sixth lower die 620, the sixth upper die 610 is arranged above the sixth lower die 620, and the sixth upper die 610 is reciprocally movable up and down relative to the sixth lower die 620. The sixth upper die 610 is provided with a sixth upper punch rod 611 and a third upper push tube 612, and the sixth lower die 620 is provided with a sixth main die 621, a sixth lower punch rod 622 and a third lower push tube 623. The sixth main die 621 is provided with a sixth cavity for placing the stepped hole blank e. The bottom wall of the sixth cavity is provided with a sixth through hole for the sixth lower punch rod 622 to extend into. The sixth lower punch rod 622 is used to support the stepped hole blank e. The sixth upper punch rod 611 is provided with a seventh through hole 6111 for the sixth lower punch rod 622 to extend into. The sixth upper punch rod 611 is used to extend into the sixth cavity to cooperate with the sixth main die 621 and the sixth lower punch rod 622 to remove the waste between the stepped hole and the small hole 720 of the stepped hole blank e, press the end face to control the length, and obtain the finished product f. The third upper push tube 612 is slidably sleeved on the sixth upper punch rod 611, and the third upper push tube 612 is used to push the finished product f out of the sixth upper punch rod 611. The third lower push tube 623 is slidably sleeved on the sixth lower punch rod 622, and the third lower push tube 623 is used to push the finished product f out of the sixth lower punch rod 622.
[0062] The final forming die 600 is located behind the stepped hole forming die 500. The stepped hole blank e is placed in the sixth cavity. The sixth upper die 610 drives the sixth upper punch rod 611 and the sixth upper push tube to descend. The sixth upper punch rod 611 extends into the sixth cavity. The sixth lower punch rod 622, the sixth upper punch rod 611 and the sixth main die 621 extrude the stepped hole blank e. The sixth lower punch rod 622 extrudes the waste between the stepped hole and the small hole 720 into the seventh through hole 6111. The seventh through hole 6111 can be externally connected to an air suction device to suck out the waste. The third upper push tube 612 and the third lower push tube 623 press the end face to control the length and obtain the finished product f. The sixth upper die 610 drives the sixth upper punch rod 611 to be separated from the preformed blank d. The third upper push tube 612 is abutted against the upper end face of the preformed blank d under the action of the upper push rod, so that the sixth upper punch rod 611 is separated from the preformed blank d. The third lower push tube pushes the preformed blank d out of the sixth lower punch rod 622 under the action of the lower push rod and ejects the preformed blank d from the sixth cavity.
[0063] Referring to Figure 2 , Figure 9 and Figure 10 , according to the inner hole stepped thin-walled pipe for an automobile chassis, the pipe body 700 is provided with a large hole 710 and a small hole 720 which are connected in communication, and the axial directions of the large hole 710 and the small hole 720 are consistent with the axial direction of the pipe body 700.
[0064] The inner hole step thin wall pipe is directly cold upsetting formed by six station die continuous cold extrusion deformation, and the inner hole step and thin wall are directly formed. The inner hole step thin wall pipe formed by low carbon steel directly cold upsetting is a finished product, and no additional processing is needed. The processing procedure is reduced, the production efficiency is improved, and the production cost is saved. The cold upsetting production process is stable, and only one operator is needed to operate the production line. The inner hole step thin wall pipe directly produced by cold upsetting can guarantee the consistency of product size because the formed size is controlled by the die. The complete metal flow line can be reserved in the cold upsetting process, and the mechanical properties of the inner hole step thin wall pipe are obviously improved and the product quality is obviously improved due to the cold work hardening of the metal.
[0065] In some embodiments, referring to Figure 2 , In some embodiments, referring to Figure 9 , In some embodiments, referring to Figure 10 , The ratio of the hole diameter of the pipe body 700 to the hole diameter of the large hole 710 is in the range of 1.15-1.16, which meets the requirements of the automobile chassis.
[0066] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0067] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A mold, characterized in that, include: The end face shaping die includes a first shaping die and a second shaping die. The first shaping die is used to shape one end face of the blank, and the second shaping die is used to shape the other end face of the blank to obtain a shaped blank. A positioning hole mold is used to drill a first positioning hole and a second positioning hole at both ends of the shaped blank to obtain a positioning hole blank; A preforming mold is used to form a thin-walled preform by drilling large holes in the first positioning hole and small holes in the second positioning hole. A stepped end hole mold is used to punch a stepped end hole corresponding to the small hole on the bottom wall of the large hole of the preform blank and flatten the bottom of the large hole to obtain a stepped end hole blank. The final forming mold is used to remove the waste material between the stepped tail hole and the small hole from the blank with the stepped tail hole and press the end face to control the length to obtain the finished product.
2. The mold according to claim 1, characterized in that, The first forming die includes a first upper die and a first lower die. The first upper die is located above the first lower die and has a first upper punch. The first lower die has a first main die, a first lower punch, and an elastic element. The first main die has a first cavity for placing a blank. The bottom wall of the first cavity has a first through hole for the first lower punch to extend into. The elastic element is located below the first lower punch and is used to push the first lower punch into the first cavity. The first lower punch is used to support the blank and push the blank out of the first cavity. The first upper punch is used to extend into the first cavity and cooperate with the first main die and the first lower punch to shape one end face of the blank.
3. The mold according to claim 1, characterized in that, The second forming die includes a second upper die and a second lower die. The second upper die is located above the second lower die. A second upper punch is provided on the second upper die. A second main die and a second lower punch are provided on the second lower die. A second cavity for placing the blank is provided inside the second main die. A second through hole for the second lower punch to extend into is provided on the bottom wall of the second cavity. The second lower punch is used to support the blank and push the forming blank out of the second cavity. The second upper punch is used to extend into the second cavity and cooperate with the second main die and the second lower punch to shape the other end face of the blank, thereby obtaining the forming blank.
4. A mold according to claim 1, characterized in that, The positioning hole punching die includes a third upper die and a third lower die. The third upper die is positioned above the third lower die. The third upper die has a third upper punch with a first positioning protrusion for punching the first positioning hole. The third lower die has a third main die and a third lower punch with a second positioning protrusion for punching the second positioning hole. The third main die has a third cavity for placing the shaping blank. The bottom wall of the third cavity has a third through hole for the third lower punch to extend into. The third lower punch supports the shaping blank and pushes the positioning hole punching blank out of the third cavity. The third upper punch extends into the third cavity and, in conjunction with the third main die and the third lower punch, punches the first positioning hole and the second positioning hole at both ends of the shaping blank, thereby obtaining the positioning hole punching blank.
5. A mold according to claim 1, characterized in that, The preforming mold includes a fourth upper mold and a fourth lower mold. The fourth upper mold is located above the fourth lower mold. The fourth upper mold is provided with a fourth upper punch and a first upper push tube. The fourth lower mold is provided with a fourth main mold, a fourth lower punch, and a first lower push tube. The fourth main mold has a fourth cavity for placing the blank with positioning holes. The bottom wall of the fourth cavity has a fourth through hole for the fourth lower punch to extend into. The fourth lower punch is used to support the blank with positioning holes. The fourth upper punch is used to extend into the fourth cavity to cooperate with the fourth main mold and the fourth lower punch to punch large holes in the blank with positioning holes to form a thin wall and to punch small holes based on the second positioning hole, thereby obtaining a preforming blank. The first upper push tube is slidably sleeved on the fourth upper punch, and the first upper push tube is used to push the preformed blank out of the fourth upper punch. The first lower push tube is slidably sleeved on the fourth lower punch, and the first lower push tube is used to push the preformed blank out of the fourth lower punch.
6. A mold according to claim 5, characterized in that, The depth of the fourth cavity is less than the length of the preform.
7. A mold according to claim 1, characterized in that, The stepped tail hole die includes a fifth upper die and a fifth lower die. The fifth upper die is located above the fifth lower die. The fifth upper die is provided with a fifth upper punch and a second upper push tube. The lower end of the fifth upper punch is provided with a tail hole protrusion for punching the stepped tail hole. The fifth lower die is provided with a fifth main die, a fifth lower punch, and a second lower push tube. The fifth main die is provided with a fifth cavity for placing the preform. The bottom wall of the fifth cavity is provided with a fifth through hole for the fifth lower punch to extend into. The fifth lower punch is used to support the preform. The fifth upper punch is used to extend into the fifth cavity to cooperate with the fifth main die and the fifth lower punch to punch the stepped tail hole on the preform and flatten the bottom of the large hole to obtain a stepped tail hole blank. The second upper push tube is slidably sleeved on the fifth upper punch, and the second upper push tube is used to push the stepped tail hole blank out of the fifth upper punch. The second lower push tube is slidably sleeved on the fifth lower punch, and the second lower push tube is used to push the stepped tail hole blank out of the fifth lower punch. The depth of the fifth cavity is less than the length of the stepped tail hole blank.
8. A mold according to claim 1, characterized in that, The final forming mold includes a sixth upper mold and a sixth lower mold. The sixth upper mold is located above the sixth lower mold. The sixth upper mold is provided with a sixth upper punch and a third upper push tube. The sixth lower mold is provided with a sixth main mold, a sixth lower punch, and a third lower push tube. The sixth main mold has a sixth cavity for placing the blank with the stepped tail hole. The bottom wall of the sixth cavity has a sixth through hole for the sixth lower punch to extend into. The sixth lower punch is used to support the blank with the stepped tail hole. The sixth upper punch has a seventh through hole for the sixth lower punch to extend into. The sixth upper punch is used to extend into the sixth cavity to cooperate with the sixth main mold and the sixth lower punch to remove the waste material between the stepped tail hole and the small hole of the blank with the stepped tail hole and press the end face to control the length to obtain the finished product. The third upper push tube is slidably sleeved on the sixth upper punch, and the third upper push tube is used to push the finished product out of the sixth upper punch. The third lower push tube is slidably sleeved on the sixth lower punch, and the third lower push tube is used to push the finished product out of the sixth lower punch.
9. A thin-walled tubular component with an inner stepped bore for an automobile chassis, manufactured using a mold as described in any one of claims 1-8, characterized in that, The device includes a tube body, on which a large hole and a small hole are provided, the axial directions of the large hole and the small hole being consistent with the axial direction of the tube body.
10. A thin-walled tubular fitting with an inner bore step for an automobile chassis according to claim 9, characterized in that, The ratio of the diameter of the tube body to the diameter of the large hole is in the range of 1.15-1.16.