Star-shaped sleeve blank fixture and manufacturing process and star-shaped sleeve blank extrusion molding method

Abstract

The present invention relates to a star-shaped sleeve blank fixture and a manufacturing process as well as a star-shaped sleeve blank extrusion molding method. It solves the technical problems of the existing star-shaped sleeve processing cost being high and the clamping precision being low. It comprises at least three claw bodies movably arranged on a power chuck, and one end of the claw bodies close to each other is detachably mounted with a clamping body, the clamping bodies are evenly distributed circumferentially with the center of the power chuck as the center, and a clamping space for clamping a star-shaped sleeve blank formed by extrusion molding is formed between the clamping bodies, and the side of the clamping body away from the claw body has an arc groove positioning structure matching the arc groove on the star-shaped sleeve blank. The advantages are: the center of the star-shaped sleeve blank can be automatically found through the upper ball track positioning arc surface and the lower ball track positioning arc surface, ensuring the high precision of the clamping part in clamping the star-shaped sleeve blank; the transition arc surface can meet the curvature of the middle protrusion of various arc grooves, making the clamping adaptability higher.

Description

Technical Field

[0001] The invention belongs to the technical field of fixture equipment, and in particular relates to a star-shaped sleeve blank fixture and a manufacturing process and a star-shaped sleeve blank extrusion molding method. Background Art

[0002] The star-shaped sleeve is one of the important parts of the car transmission system, so the shape and size accuracy of the star-shaped sleeve are required to be high; currently most of the star-shaped sleeves are made by forging forming process, among which the star-shaped sleeve requires high-precision arc groove, and it is necessary to increase the groove milling machine to process the arc groove of the star-shaped sleeve to ensure the high precision of the arc groove of the star-shaped sleeve, and different clamps are needed to clamp the star-shaped sleeve during processing, which increases the investment cost of equipment, material cost and energy loss; due to the insufficient precision of the clamps for clamping the star-shaped sleeve blanks, errors may occur in the processing accuracy of the star-shaped sleeve blanks.

[0003] In order to solve the deficiencies of the prior art, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a split claw [201821999870.4], which includes three claws, the claws include a bottom claw and a top claw, the bottom claw includes a first connecting part and a second connecting part that are arranged vertically and connected to each other, the first connecting part is provided with a first threaded hole, a screw is threaded in the first threaded hole, the middle part of the second connecting part extends along the direction of the first connecting part to form a protrusion as a guide rail, the protrusion is provided with two second threaded holes that penetrate the second connecting part, the top claw includes a rectangular body and an arc-shaped end matching the channel of the star sleeve, the rectangular body is provided with a strip through hole and a circular through hole, the bottom of the rectangular body is provided with a groove matching the protrusion, and the top claw is connected to the bottom claw by movably clamping the protrusion in the groove.

[0004] The above solution solves the problem of clamping accuracy of the existing star-shaped sleeve clamp to a certain extent, but the solution still has many shortcomings. For example, the arc-shaped end of the top clamping claw is vertically arranged and the upper and lower arcs are consistent, and the accuracy of the arc groove for clamping the star-shaped sleeve is still insufficient. Summary of the invention

[0005] The object of the present invention is to provide a star-shaped sleeve blank fixture in view of the above problems.

[0006] Another problem solved by the present invention is to provide a process for manufacturing a star-shaped sleeve blank fixture.

[0007] Another problem solved by the present invention is to provide a method for extruding a star-shaped sleeve blank.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the star-shaped sleeve blank clamp comprises at least three claw bodies movably arranged on a power chuck, and the ends of the claw bodies close to each other are detachably installed with a clamping body, and the clamping bodies are evenly distributed circumferentially around the center of the power chuck, and a clamping space for clamping the star-shaped sleeve blank formed by extrusion is formed between the clamping bodies, and the side of the clamping body away from the claw body has an arc groove positioning structure matching the arc groove on the star-shaped sleeve blank.

[0009] In the above-mentioned star-shaped sleeve blank clamp, the arc channel positioning structure includes a clamping part arranged on the side of the clamp body away from the claw body, and one side of the clamping part has an upper ball channel positioning arc surface and a lower ball channel positioning arc surface arranged in sequence from top to bottom, and the upper ball channel positioning arc surface and the lower ball channel positioning arc surface are connected by a transition arc surface.

[0010] In the above-mentioned star-shaped sleeve blank fixture, the upper ballway positioning arc surface is arranged to extend downwardly and obliquely toward the inner side of the clamping part away from the outer side of the clamping part, and the lower ballway positioning arc surface is arranged to extend upwardly and obliquely toward the inner side of the clamping part away from the outer side of the clamping part, and the upper ballway positioning arc surface, the transition arc surface and the lower ballway positioning arc surface close to the two sides of the clamping part are respectively located on the same vertical plane.

[0011] In the above-mentioned star-shaped sleeve blank fixture, an angle is formed between the outer side of the upper ball track positioning arc surface away from the clamping portion and the outer side of the lower ball track positioning arc surface away from the clamping portion, and the size of the angle is 120°-160°.

[0012] In the above-mentioned star-shaped sleeve blank clamp, an installation step is provided at one end of the claw body close to the clamp body, and the side of the clamp body away from the clamping part has a mounting part connected to the clamping part, and the upper end of the mounting part is flush with the upper side of the claw body and the mounting part is connected to the mounting step by a number of positioning bolts.

[0013] In the above-mentioned star-shaped sleeve blank fixture, the side of the installation portion away from the clamping portion has an arc-shaped positioning portion, and one side of the installation step is provided with an arc-shaped matching portion matching the arc-shaped positioning portion, and both sides of the arc-shaped positioning portion respectively have limiting portions extending toward the outside of the installation step and abutting against the outside of the installation step.

[0014] The manufacturing process of the star-shaped sleeve blank fixture using the above-mentioned star-shaped sleeve blank fixture is as follows. The manufacturing process of the star-shaped sleeve blank fixture includes the following steps:

[0015] S1. Select at least three pieces of heat-treated materials and grind them simultaneously on a surface grinder to form at least three clamp body blanks;

[0016] S2. Use slow wire cutting equipment to process the clamping body blanks simultaneously;

[0017] S3, using a precision engraving machine to simultaneously carve out arc channel positioning structures on the clamp body blank to form a clamp body;

[0018] S4. Evenly install three standard jaw bodies on the power chuck. After fixing them, align the center position of the power chuck through the outer circle of the power chuck on the machining center machine. After aligning, process the three jaw bodies at the same time to machine the installation reference surfaces, slots and fixing screw holes of the three jaw bodies.

[0019] S5. Install the clamp body on the claw body.

[0020] In the above-mentioned star-shaped sleeve blank fixture manufacturing process, the hardness of the heat-treated material in step S1 is HRC40-45, and the thickness, size and precision of the clamp body blank are consistent; the outer contour of the clamp body blank in step S2 is consistent, and the arc contour of the arc groove positioning structure on the clamp body in step S3 is consistent.

[0021] A method for extruding a star-shaped sleeve blank, the method comprising the following steps:

[0022] A1. According to the total volume capacity of the star-shaped sleeve, the round bar material is sawn into small sections for cutting to form the blank to be extruded;

[0023] A2. Add liquid or solid lubricant to the surface of the blank to be extruded for lubrication;

[0024] A3. Place the blank to be extruded in the extrusion die, use a large-tonnage hydraulic press to synchronously close the extrusion die, maintain the pressure for a certain period of time and then demould it to form the star-shaped sleeve blank in the above-mentioned star-shaped sleeve blank fixture.

[0025] In the above-mentioned star-shaped sleeve blank extrusion molding method, the extrusion mold in step A3 is a mold combination having a 6-petal arc profile and is precisely carved and surface hardened.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The upper ball track positioning arc surface and the lower ball track positioning arc surface can automatically find the center of the star-shaped sleeve blank, ensuring the high accuracy of the clamping part in clamping the star-shaped sleeve blank;

[0028] 2. The transition arc surface can meet the curvature of the middle convexity of various arc channels, making the clamping adaptability higher;

[0029] 3. The clamp body and the claw body are detachably connected, which can facilitate the replacement or maintenance of the clamp body under long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the star-shaped sleeve blank in the present invention.

[0032] Figure 3 It is a structural explosion diagram of the claw body in the present invention.

[0033] Figure 4 It is a specific structural schematic diagram of the present invention.

[0034] Figure 5 It is a structural schematic diagram of the angle between the upper fairway positioning arc surface and the lower fairway positioning arc surface in the present invention.

[0035] In the figure: power chuck 1, claw body 2, mounting step 21, arc-shaped matching portion 211, clamp body 3, mounting portion 31, arc-shaped positioning portion 311, limiting portion 312, star-shaped sleeve blank 4, circular arc channel 41, circular arc channel positioning structure 5, clamping portion 51, upper ball channel positioning arc surface 511, lower ball channel positioning arc surface 512, transition arc surface 513. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 , Figure 2 , Figure 4 As shown, the star-shaped sleeve blank clamp comprises at least three claw bodies 2 movably arranged on the power chuck 1, the claw bodies 2 are fixed on the power chuck 1 by two fixing screws, and the ends of the claw bodies 2 close to each other are detachably installed with a clamp body 3, the clamp bodies 3 are evenly distributed circumferentially around the center of the power chuck 1, and a clamping space for clamping a star-shaped sleeve blank 4 formed by extrusion molding is formed between the clamp bodies 3, the star-shaped sleeve blank 4 formed by extrusion molding can make the processing allowance of the star-shaped sleeve blank 4 smaller, and there is no need to add a groove milling machine for processing, saving production costs, and the side of the clamp body 3 away from the claw body 2 has an arc groove positioning structure 5 matching the arc groove 41 on the star-shaped sleeve blank 4, and the arc groove positioning structure 5 can ensure the high precision of the clamping of the clamp body 3.

[0038] Specifically, the arc channel positioning structure 5 includes a clamping portion 51 arranged on the side of the clamping body 3 away from the claw body 2, and one side of the clamping portion 51 has an upper ballway positioning arc surface 511 and a lower ballway positioning arc surface 512 arranged in sequence from top to bottom, and the upper ballway positioning arc surface 511 and the lower ballway positioning arc surface 512 are connected by a transition arc surface 513. The upper ballway positioning arc surface 511 and the lower ballway positioning arc surface 512 can automatically find the center of the star-shaped sleeve blank 4 through the upper ballway positioning arc surface 511 and the lower ballway positioning arc surface 512, thereby ensuring the high precision of the clamping portion 51 in clamping the star-shaped sleeve blank 4.

[0039] Among them, the upper ballway positioning arc surface 511 is arranged to extend downwardly and obliquely toward the inner side of the clamping part 51 away from the outer side of the clamping part 51, and the lower ballway positioning arc surface 512 is arranged to extend upwardly and obliquely toward the inner side of the clamping part 51 away from the outer side of the clamping part 51, and the upper ballway positioning arc surface 511, the transition arc surface 513 and the lower ballway positioning arc surface 512 are respectively located on the same vertical plane on both sides close to the clamping part 51. The inclined setting of the upper ballway positioning arc surface 511 and the lower ballway positioning arc surface 512 can better accurately fit with the arc channel 41 of the star-shaped sleeve blank 4, thereby further improving the clamping accuracy.

[0040] like Figure 3 , Figure 4 , Figure 5 As shown, preferably, an angle α is formed between the upper ball track positioning arc surface 511 away from the outer side of the clamping portion 51 and the lower ball track positioning arc surface 512 away from the outer side of the clamping portion 51, and the angle α is 120°-160°. When clamping the star-shaped sleeve blank 4, it can meet the curvature of the middle protrusion of various circular arc channels 41, making the clamping adaptability higher.

[0041] Furthermore, a mounting step 21 is provided at one end of the claw body 2 close to the clamping body 3, and the mounting step 21 is designed as an integral part of the claw body 2. The side of the clamping body 3 away from the clamping portion 51 has a mounting portion 31 connected to the clamping portion 51 as an integral part, and when the mounting portion 31 is arranged on the mounting step 21, the upper end of the mounting portion 31 is flush with the upper side of the claw body 2 and the mounting portion 31 is connected to the mounting step 21 by a number of positioning bolts, and the mounting portion 31 can be quickly disassembled and replaced by removing the positioning bolts.

[0042] Among them, the side of the mounting portion 31 away from the clamping portion 51 is provided with an arc-shaped positioning portion 311, and one side of the mounting step 21 is provided with an arc-shaped matching portion 211 matching the arc-shaped positioning portion 311, and both sides of the arc-shaped positioning portion 311 respectively have limiting portions 312 extending toward the outside of the mounting step 21 and abutting against the outside of the mounting step 21. The arc-shaped positioning portion 311 and the arc-shaped matching portion 211 that are mutually engaged with the arc-shaped positioning portion 311 and the limiting portion 312 limit the arc-shaped matching portion 211, which can further make the mounting portion 31 and the claw body 2 tightly connected.

[0043] The manufacturing process of the star-shaped sleeve blank fixture of the star-shaped sleeve blank fixture includes the following steps:

[0044] S1. Select at least three pieces of heat-treated materials and grind them simultaneously on a surface grinder to form at least three clamp body blanks;

[0045] S2. Use slow wire cutting equipment to process the clamping body blanks simultaneously;

[0046] S3, using a precision engraving machine to simultaneously carve out the arc channel positioning structure 5 on the clamp body blank to form the clamp body 3;

[0047] S4. Evenly install three standard jaw bodies 2 on the power chuck 1. After fixing, align the center position of the power chuck 1 through the outer circle of the power chuck 1 on the machining center machine. After alignment, the three jaw bodies 2 are processed simultaneously to obtain the installation reference surfaces, card slots and fixing screw holes of the three jaw bodies 2.

[0048] S5, installing the clamp body 3 on the claw body 2.

[0049] Among them, the hardness of the heat-treated material in step S1 is HRC40-45, which has a very high hardness, and the thickness, size and precision of the clamp body blank are consistent, which can ensure the uniformity of the clamp body blank on the power chuck 1, thereby ensuring the clamping accuracy of the clamp body 3 after the clamp body blank is formed; the outer contour of the clamp body blank in step S2 is consistent, and the arc contour of the arc channel positioning structure 5 on the clamp body 3 in step S3 is consistent, which can prevent the clamp body 3 from having errors in accuracy during the clamping process and maintain high precision.

[0050] A method for extruding a star-shaped sleeve blank, the method comprising the following steps:

[0051] A1. According to the total volume capacity of the star-shaped sleeve, the round bar material is sawn into small sections for cutting to form the blank to be extruded;

[0052] A2. Adding liquid or solid lubricant to the surface of the extruded blank for lubrication can effectively prevent the friction between the extruded blank and other objects during the extrusion process, and can also prevent or reduce the generation of cracks;

[0053] A3. Place the blank to be extruded in the extrusion die, use a large-tonnage hydraulic press to synchronously close the extrusion die, maintain the pressure for a certain period of time and then demould it to form the star-shaped sleeve blank 4 in the above-mentioned star-shaped sleeve blank fixture.

[0054] Furthermore, the extrusion die in step A3 is a combination of dies having a 6-petal arc profile, which is precisely carved and surface hardened.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0056] Although the power chuck 1, the claw body 2, the mounting step 21, the arc-shaped matching part 211, the clamp body 3, the mounting part 31, the arc-shaped positioning part 311, the limiting part 312, the star-shaped sleeve blank 4, the arc channel 41, the arc channel positioning structure 5, the clamping part 51, the upper ballway positioning arc surface 511, the lower ballway positioning arc surface 512, the transition arc surface 513 and other terms are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A manufacturing process of a star-shaped sleeve blank fixture, the star-shaped sleeve blank fixture comprising at least three claw bodies (2) movably arranged on a power chuck (1), characterized in that: The ends of the claw bodies (2) close to each other are detachably mounted with a clamp body (3), the clamp bodies (3) being evenly distributed in the circumferential direction with the center of the power chuck (1) as the center, and a clamping space for clamping a star-shaped sleeve blank (4) formed by extrusion forming is formed between the clamp bodies (3), and the side of the clamp body (3) away from the claw body (2) has an arc groove positioning structure (5) matching the arc groove (41) on the star-shaped sleeve blank (4); the arc groove positioning structure (5) comprises a clamping portion (51) arranged on the side of the clamp body (3) away from the claw body (2), and one side of the clamping portion (51) has a plurality of arc grooves (51) arranged in sequence from top to bottom. The upper fairway positioning arc surface (511) and the lower fairway positioning arc surface (512) are connected to each other via a transition arc surface (513); the upper fairway positioning arc surface (511) extends obliquely downward from the outer side of the clamping portion (51) toward the inner side of the clamping portion (51), and the lower fairway positioning arc surface (512) extends obliquely upward from the outer side of the clamping portion (51) toward the inner side of the clamping portion (51), and the upper fairway positioning arc surface (511), the transition arc surface (513) and the lower fairway positioning arc surface (512) are respectively located on the same vertical plane on both sides close to the clamping portion (51); The manufacturing process comprises the following steps: S1. Select at least three pieces of heat-treated materials and grind them simultaneously on a surface grinder to form at least three clamp body blanks; S2. Use slow wire cutting equipment to process the clamping body blanks simultaneously; S3, using a precision engraving machine to simultaneously carve out a circular arc groove positioning structure (5) on the clamp body blank to form a clamp body (3); S4. Evenly install three standard jaw bodies (2) on the power chuck (1). After fixing, align the center position of the power chuck (1) through the outer circle of the power chuck (1) on a machining center machine. After alignment, the three jaw bodies (2) are processed simultaneously to obtain the installation reference surfaces, the slots and the fixing screw holes of the three jaw bodies (2); S5. Install the clamp body (3) on the claw body (2).

2. The manufacturing process of the star-shaped sleeve blank fixture according to claim 1 is characterized in that: An angle (α) is formed between the outer side of the upper ballway positioning arc surface (511) away from the clamping portion (51) and the outer side of the lower ballway positioning arc surface (512) away from the clamping portion (51), and the angle (α) is 120°-160°.

3. The manufacturing process of the star-shaped sleeve blank fixture according to claim 1 or 2 is characterized in that: An end of the claw body (2) close to the clamp body (3) is provided with a mounting step (21), and a side of the clamp body (3) away from the clamping portion (51) has a mounting portion (31) connected to the clamping portion (51) as a whole, and the upper end of the mounting portion (31) is flush with the upper side of the claw body (2), and the mounting portion (31) is connected to the mounting step (21) via a plurality of positioning bolts.

4. The manufacturing process of the star-shaped sleeve blank fixture according to claim 3 is characterized in that: The side of the mounting portion (31) away from the clamping portion (51) is provided with an arc-shaped positioning portion (311), and the side of the mounting step (21) is provided with an arc-shaped matching portion (211) matching the arc-shaped positioning portion (311), and both sides of the arc-shaped positioning portion (311) are respectively provided with limiting portions (312) extending toward the outside of the mounting step (21) and abutting against the outside of the mounting step (21).

5. The manufacturing process of the star-shaped sleeve blank fixture according to claim 1 is characterized in that: The hardness of the heat-treated material in step S1 is HRC40-45, and the thickness, size and precision of the clamp body blank are consistent; the outer contours of the clamp body blank in step S2 are consistent, and the arc contours of the arc groove positioning structure (5) on the clamp body (3) in step S3 are consistent.

Images