New inner star wheel forming die structure

Abstract

The invention discloses a novel inner star wheel forming mold structure, including an upper mold and a lower mold, wherein the upper mold includes an upper molding part, and the lower mold includes a lower molding part, wherein the upper molding part is provided with an upper notch adapted to the upper half of the inner star wheel standard part at the bottom, and an arched part is provided at the bottom of the upper molding part, wherein the inner wall surface of the arched part is adapted to the outer wall surface of the ballway one, and the end surface of the arched part is connected to the maximum diameter of the ballway one, and the lower molding part is provided with a lower notch adapted to the lower half of the inner star wheel standard part at the top, and the lower molding part is provided with a recessed part at the fixed part, and the end surfaces of the upper molding part and the lower molding part can be fitted, and the arched part can be embedded in the recessed part and the end surfaces of the two can be fitted. The molding of the ballway of non-uniform shape can be realized, and the inner star wheel can be demoulded to obtain the inner star wheel.

Description

Technical Field

[0001] The invention relates to a forming die for an inner star wheel used for an automobile transmission shaft, and in particular to a novel inner star wheel forming die structure. Background Art

[0002] The inner and outer star wheels of the automobile transmission shaft are assembled together and realize the transmission in the rotation direction through the ball bearing. The inner and outer star wheels of the automobile transmission shaft are important parts of the automobile transmission shaft. The present invention relates to the structure of the inner star wheel, which includes a columnar body, an axial hole coaxial with the columnar body is opened inside the columnar body, and a spherical raceway for accommodating steel balls is opened on the outer edge of the columnar body. There are 6 spherical raceways evenly distributed on the outer edge of the columnar body.

[0003] In the traditional inner star wheel structure, each ball track has the same shape and direction, that is, the upper and lower parting surfaces of this type of product are on the same plane. Therefore, when designing the mold, the contact surfaces of the upper and lower molds are also on the same plane, and the upper and lower molds are two planes in contact and pressed together. The inner star wheel structure involved in the present invention is a new structure, such as Figure 1 As shown, the inner star wheel 03 is a spherical structure with multiple spherical raceways on its surface, and the shapes of two adjacent spherical raceways are different, which are respectively recorded as raceway 1 and raceway 2. Figure 1 It can be seen that the maximum diameter of the second ball track 02 is located in the middle, while the maximum diameter of the first ball track 01 is not located in the middle, but in the lower part. Therefore, the inner star wheel of the above structure cannot be obtained by using the traditional upper and lower molds with flat contact surfaces, and the inner star wheel of the structure is also difficult to demould from the mold. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a novel inner star wheel forming mold structure, which can realize the molding of non-uniform shape ballways and can demould to obtain the inner star wheel.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a new type of inner star wheel forming mold structure, including an upper mold and a lower mold, the upper mold includes an upper molding part, the lower mold includes a lower molding part, the bottom of the upper molding part is provided with an upper notch adapted to the upper half of the inner star wheel standard part, the bottom of the upper molding part is provided with an arched part, the inner wall surface of the arched part adapts to the outer wall surface of the ballway one, the end surface of the arched part is connected to the maximum diameter of the ballway one, the top of the lower molding part is provided with a lower notch adapted to the lower half of the inner star wheel standard part, the fixed part of the lower molding part is provided with a recessed part, the end surfaces of the upper molding part and the lower molding part can be fitted, the arched part can be embedded in the recessed part and the end surfaces of the two are fitted.

[0006] A further preferred embodiment of the present invention is as follows: the upper mold further comprises an upper cylinder wrapped around the outer periphery of the upper molding, and the lower mold further comprises a lower cylinder wrapped around the outer periphery of the lower molding, and the upper cylinder has the same structure as the lower cylinder.

[0007] A further preferred embodiment of the present invention is as follows: the end face of the upper molded part is located inside the upper cylinder, the end face of the lower molded part extends out of the lower cylinder, the upper cylinder fits with the lower cylinder, the end face of the lower molded part extends into the upper cylinder and the end faces of the upper molded part fit with the end faces of the lower molded part.

[0008] A further preferred embodiment of the present invention is as follows: the end face of the upper molded part extends out of the upper cylinder, the end face of the lower molded part is located in the lower cylinder, and the upper cylinder fits with the lower cylinder. Then, the end face of the upper molded part extends into the lower cylinder and the end faces of the upper molded part fit with the lower molded part.

[0009] A further preferred solution of the present invention is that the upper cylinder is provided with a base on its outer sleeve, the base is firmly connected to the upper cylinder, and the bottom surface of the base is flush with the bottom surface of the upper cylinder.

[0010] A further preferred solution of the present invention is that the outer shell of the lower cylinder is provided with a base, the base is tightly connected to the lower cylinder, and the top surface of the base is flush with the top surface of the lower cylinder.

[0011] A further preferred solution of the present invention is that the end surface of the upper molded part and the end surface of the arched part are transitioned through an inclined surface, and the end surface of the lower molded part and the end surface of the recessed part are transitioned through an inclined surface.

[0012] A further preferred solution of the present invention is that the upper die is provided with a through hole for the punch to pass through, and the punch can enter the upper notch to act on the inner star wheel.

[0013] A further preferred solution of the present invention is that the lower die is provided with a through hole for the punch to pass through, and the punch can enter the lower notch to act on the inner star wheel.

[0014] Compared with the prior art, the advantage of the present invention is that the maximum diameter of the ballway 2 of the inner star wheel to be formed is located in the middle, and the maximum diameter of the ballway 1 is located in the lower part. The present invention sets an upper notch at the bottom of the upper forming part to realize the forming of the upper half of the inner star wheel. Then, an arched part is set at the bottom of the upper forming part, and the inner wall surface of the arched part adapts to the outer wall surface of the ballway 1. The arched part is a downward extension of the upper forming part, and can form the middle part below the ballway 1. The end surface of the arched part is connected to the maximum diameter of the ballway 1, and the fixed part of the lower forming part is provided with a recessed part. The arched part can be embedded in the recessed part and the end surfaces of the two are in contact. That is to say, in the present invention, in the upper mold and the lower mold, through the structural setting of the arched part and the recessed part, the forming of the ballway 1 is divided by the maximum diameter of the ballway 1, and the parting surface of the upper mold and the lower mold is designed to realize the forming of the ballway 1, and then the upper mold and the lower mold whose end surfaces can be in contact are matched to realize the overall structural forming of the inner star wheel. The upper die end face and the lower die end face of the present invention are mutually matched curved surfaces. When the upper die and the lower die are pressed together, the inner core wheel can be formed; when the upper die and the lower die are separated, the inner core wheel structure can be released from the die. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0016] Figure 1 The inner star wheel structure to be formed in the present invention;

[0017] Figure 2 It is a structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic structural diagram of the upper mold of the first solution of the present invention;

[0019] Figure 4 This is a schematic structural diagram of a mold of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of Scheme 2 of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] like Figures 2 to 4 As shown, it is scheme 1 of the present invention: a novel inner star wheel forming mold structure, including an upper mold and a lower mold, the upper mold includes an upper molding part 1, the lower mold includes a lower molding part 2, the upper molding part 1 is provided with an upper notch 3 adapted to the upper half of the inner star wheel 03 standard part at the bottom, the upper molding part 1 is provided with an arched portion 1a at the bottom, the inner wall surface of the arched portion 1a is adapted to the outer wall surface of the fairway 01, the end surface of the arched portion 1a is located at the maximum diameter of the fairway 01, the lower molding part 2 is provided with a lower notch 4 adapted to the lower half of the inner star wheel 03 standard part at the top, the lower molding part 2 is provided with a recessed portion 2a at the fixed part, the end surfaces of the upper molding part 1 and the lower molding part 2 can be fitted, the arched portion 1a can be embedded in the recessed portion 2a and the end surfaces of the two are fitted.

[0024] The upper mold also includes an upper cylinder 5 wrapped around the outer periphery of the upper molded part 1, and the lower mold also includes a lower cylinder 6 wrapped around the outer periphery of the lower molded part 2. The upper cylinder 5 has the same structure as the lower cylinder 6. In the present invention, the upper molded part 1, the arched portion 1a, and the upper cylinder 5 are an integrated structure. In the present invention, the lower molded part 2, the recessed portion 2a, and the lower cylinder 6 are an integrated structure.

[0025] The end face of the upper molded part 1 is located in the upper cylinder 5, and the end face of the lower molded part 2 extends out of the lower cylinder 6. The upper cylinder 5 fits with the lower cylinder 6, and the end face of the lower molded part 2 extends into the upper cylinder 5 and the upper molded part 1 fits with the end face of the lower molded part 2. The structural design of the upper cylinder 5 and the lower cylinder 6, in conjunction with the structural design of the upper molded part 1 and the lower molded part 2, can make it easier to achieve reference positioning during the mold closing process of the upper and lower molds, ensuring the processing progress. Moreover, the end face of the lower molded part 2 extends into the upper cylinder 5, and the upper cylinder 5 will apply stress to the lower molded part 2 and the upper molded part 1 to prevent the lower molded part 2 from expanding outward during the extrusion process.

[0026] The upper cylinder 5 is provided with a base 7 on its outer sleeve, which is tightly connected to the upper cylinder 5, and the bottom surface of the base 7 is flush with the bottom surface of the upper cylinder 5. The base 7 will apply stress to the upper cylinder 5 to prevent the upper cylinder 5 and the upper molding 1 from deforming due to the force, but the deformation mentioned here is of course very small.

[0027] The lower cylinder 6 is provided with a base 7 on its outer sleeve, which is tightly connected to the lower cylinder 6, and the top surface of the base 7 is flush with the top surface of the lower cylinder 6. The base 7 will apply stress to the lower cylinder 6 to prevent the lower cylinder 6 and the lower molding 2 from deforming due to the force, but the deformation mentioned here is of course small.

[0028] The end surface of the upper molded part 1 transitions to the end surface of the arched part 1a through an inclined surface, and the end surface of the lower molded part 2 transitions to the end surface of the recessed part 2a through an inclined surface. The curved surface structure avoids wear caused by coaxial deviation during the clamping process of the upper and lower molds.

[0029] The upper die is provided with a through hole 8 for the punch to pass through, and the punch can enter the upper notch 3 to act on the inner star wheel. The upper end surface of the inner star wheel to be formed in the present invention is also provided with a countersink structure, and the punch is used to form the countersink.

[0030] The lower die is provided with a through hole 8 for the punch to pass through, and the punch can enter the lower notch 4 to act on the inner star wheel. The lower end surface of the inner star wheel to be formed in the present invention is also provided with a countersink structure, and the punch is used to form the countersink.

[0031] like Figure 5 The second scheme of the present invention is shown. The other structures of the second scheme are the same as those of the first scheme. The difference lies in that the end face of the upper molded part 1 extends out of the upper cylinder 5, the end face of the lower molded part 2 is located in the lower cylinder 6, and the upper cylinder 5 fits with the lower cylinder 6. Then, the end face of the upper molded part 1 extends into the lower cylinder 6 and the end faces of the upper molded part 1 and the lower molded part 2 fit. The structural design of the second scheme is the same as that of the first scheme in principle. The difference lies only in whether the upper molded part 1 extends out of the upper cylinder 5 or the lower molded part 2 extends out of the lower cylinder 6.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present invention is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. New inner star wheel forming mold structure, characterized by It comprises an upper mold and a lower mold, wherein the upper mold comprises an upper molding part, and the lower mold comprises a lower molding part, wherein the upper molding part has an upper notch at the bottom thereof adapted to the upper half of the inner star wheel standard part, and an arched part is arranged at the bottom thereof, wherein the inner wall surface of the arched part is adapted to the outer wall surface of the ballway one, and the end surface of the arched part is connected to the maximum diameter of the ballway one, and the top of the lower molding part is provided with a lower notch adapted to the lower half of the inner star wheel standard part, and the fixed part of the lower molding part is provided with a recessed part, and the end surfaces of the upper molding part and the lower molding part can be fitted, and the arched part can be embedded in the recessed part and the end surfaces of the two can be fitted; The upper die is provided with a through hole for the punch to pass through, and the punch can enter the upper notch to act on the inner star wheel; the lower die is provided with a through hole for the punch to pass through, and the punch can enter the lower notch to act on the inner star wheel.

2. The new inner star wheel forming mold structure according to claim 1 is characterized in that The upper mold further comprises an upper cylinder wrapped around the outer periphery of the upper molding part, and the lower mold further comprises a lower cylinder wrapped around the outer periphery of the lower molding part. The upper cylinder and the lower cylinder have the same structure.

3. The new inner star wheel forming mold structure according to claim 2 is characterized in that The end surface of the upper molding is located in the upper cylinder, the end surface of the lower molding extends out of the lower cylinder, the upper cylinder fits with the lower cylinder, the end surface of the lower molding extends into the upper cylinder and the end surfaces of the upper molding fit with the lower molding.

4. The new inner star wheel forming mold structure according to claim 2 is characterized in that The end surface of the upper molding extends out of the upper cylinder, the end surface of the lower molding is located in the lower cylinder, and the upper cylinder fits with the lower cylinder. The end surface of the upper molding extends into the lower cylinder and the end surfaces of the upper molding fit with the lower molding.

5. The new inner star wheel forming mold structure according to claim 2 is characterized in that The upper cylinder piece is provided with a base on its outer sleeve, the base is firmly connected to the upper cylinder piece, and the bottom surface of the base is flush with the bottom surface of the upper cylinder piece.

6. The new inner star wheel forming mold structure according to claim 2 is characterized in that The lower cylinder piece is provided with a base on its outer sleeve, the base is firmly connected to the lower cylinder piece, and the top surface of the base is flush with the top surface of the lower cylinder piece.

7. The new inner star wheel forming mold structure according to claim 1 is characterized in that The end surface of the upper molded part is transitioned to the end surface of the arched part through an inclined surface, and the end surface of the lower molded part is transitioned to the end surface of the recessed part through an inclined surface.

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