Inner star wheel mold capable of achieving radial demolding

Abstract

The utility model provides an inner star wheel mould capable of demoulding radially, which comprises an upper module and a lower module, the lower module comprises a lower template, an outer mould, an inner mould and a reset device, the outer side wall of the inner mould is arranged to have the same inclination angle as a mould cavity of the outer mould, the inner mould is of a split structure, and the reset device is arranged on the outer side wall of the inner mould. And the resetting device can automatically reset after controlling the inner mold to demold. The utility model has the advantages of simple structure, ingenious design, convenience in installation, accurate positioning and the like.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to an inner star wheel mold capable of radial demoulding. Background Art

[0002] As an important automotive component that transmits torque between the drive shaft and the driven wheel, the inner star wheel plays an important role in variable angle power transmission. With the continuous development of technology, reducing gear shift delay and gear shift shock has become an important aspect of improving driving comfort. The ball groove of the inner star wheel has gradually evolved from the conventional symmetrical arc type to complex asymmetric ball groove structures such as "S" type and "VL" type (oblique type). It is well known that cold forging technology has advantages over machining such as high material utilization and short processing time. Therefore, the inner star wheel is generally formed by cold forging. However, due to the asymmetry of the new inner star wheel ball groove, the conventional cold forging die structure can no longer meet the requirements of forging demolding and automated production.

[0003] Therefore, it is necessary to provide a new technical solution. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the utility model discloses an inner star wheel mold capable of radial demoulding, and the specific technical scheme is as follows:

[0005] The utility model provides an inner star wheel mold capable of radial demoulding, comprising an upper mold group and a lower mold group, wherein the lower mold group comprises a lower mold plate, an outer mold, an inner mold and a reset device.

[0006] The outer mold is fixed on the top of the lower mold plate, and the inner wall of the mold cavity of the outer mold is set to a tapered shape that is wide at the top and narrow at the bottom.

[0007] The inner mold is arranged in the mold cavity of the outer mold and is in close contact with the outer mold. The outer side wall of the inner mold is arranged at the same inclination angle as the mold cavity of the outer mold. The inner mold is a split structure. A plurality of connecting through holes are arranged on the inner mold, and the upper part of the connecting through hole is coaxially arranged as a fixing groove with a diameter larger than the connecting through hole.

[0008] The reset device includes a guide column and a fixing spring, the lower end of the guide column passes through the connecting through hole and is fixed downward, the upper end of the guide column extends into the fixing groove and does not extend out of the inner mold, one end of the fixing spring is fixed to the bottom of the fixing groove, and the other end of the fixing spring is fixed to the top of the guide column, and the diameter of the fixing spring is larger than the diameter of the connecting through hole.

[0009] When demoulding, the inner mold moves upward along the guide column and squeezes the fixed spring. After the workpiece is separated, the inner mold returns to its original position under the action of the fixed spring.

[0010] In the above technical features, when the cut block slides upward and outward during material removal, the cut block is always subject to the compression force of the fixed spring. When the inner star wheel is completely separated from the inner mold cavity, the cut block slides downward and inward along the guide column by the force provided by the fixed spring, and quickly returns to the initial state. The length of the fixed spring is greater than the length of the fixed groove along the demolding angle direction, ensuring that the fixed spring always applies a downward pressure to the cut block.

[0011] Furthermore, the inner mold includes a plurality of blocks formed by combination, the number of the blocks corresponds to the number of ball grooves on the workpiece, the connection positions of adjacent blocks are arranged at the positions of the ball grooves corresponding to the workpiece, and each block is provided with a connecting through hole.

[0012] In the above technical features, when the cut piece slides upward and outward along the inclined angle of the inner side wall of the outer mold cavity to realize radial demoulding, no matter what shape the ball groove is, it will be separated from the inner mold cavity at the first time of demoulding.

[0013] Furthermore, the connecting through hole is parallel to the outer side wall of the inner mold, and the inclination angle of the connecting through hole is the same as the inclination angle of the outer side wall of the inner mold.

[0014] Furthermore, the outer mold is provided with a positioning groove below its mold cavity, and a positioning sleeve is provided in the positioning groove. The lower end of the guide post is fixed on the positioning sleeve, and the positioning sleeve and the guide post are transitionally matched to prevent the guide post from loosening. The top height of the guide post is lower than the top height of the inner mold to prevent the top of the guide post from exceeding the inner mold and causing it to collide with the upper mold. The height of the positioning sleeve is higher than the height of the positioning groove to ensure that the positioning sleeve can be in close contact with the structure below to prevent the guide post and the positioning sleeve from loosening during the force application process. The diameter of the connecting through hole is 0.1 mm larger than the diameter of the guide post to ensure smooth sliding of the cut block when demolding.

[0015] Furthermore, a boss is provided at the lower end of the guide column, a step hole is provided on the positioning sleeve, the guide column is fixed to the step hole of the positioning sleeve through the boss structure, and the step hole and the connecting through hole are coaxially arranged.

[0016] Furthermore, the top width of the positioning groove is greater than the bottom width of the outer mold cavity, and the positioning sleeve is fixed in the positioning groove.

[0017] Furthermore, it also includes a lower punch and a ejector rod, wherein the top end of the lower punch passes through the positioning sleeve and extends into the mold cavity of the outer mold, and the ejector rod passes through the lower mold plate and abuts against the bottom of the lower punch, and the ejector rod controls the lifting and lowering of the lower punch.

[0018] The utility model has the following beneficial effects:

[0019] 1. The inner star wheel mold with radial demoulding provided by the utility model can simultaneously meet the requirements of material stripping of inner star wheel forgings with arc-shaped, "S"-shaped and "VL"-shaped ball grooves.

[0020] 2. The radially demouldable inner star wheel mold provided by the utility model ensures that the inner star wheel of the special-shaped ball groove can be demoulded smoothly, and the cut piece can be restored to the initial state before forging extrusion through the reset device, which is convenient for subsequent automatic feeding into the mold cavity.

[0021] 3. The inner star wheel mold with radial demoulding provided by the utility model has a simple structure, ingenious design, convenient installation and precise positioning.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of an inner star wheel mold capable of radial demoulding provided by an embodiment of the utility model.

[0025] Figure 2 It is a structural schematic diagram of an outer mold provided by an embodiment of the utility model.

[0026] Figure 3 It is a structural schematic diagram of a positioning sleeve provided by an embodiment of the utility model.

[0027] Figure 4 It is a structural schematic diagram of a cut block provided by an embodiment of the utility model.

[0028] Figure 5 It is a structural schematic diagram of a guide column provided by an embodiment of the utility model.

[0029] The accompanying drawings are marked as lower template 1, outer mold 2, inner mold 3, reset device 4, lower punch 5, ejector rod 6, connecting through hole 31, fixing groove 32, guide column 41, fixing spring 42, cut block 33, positioning groove 21, positioning sleeve 22, boss 411, and step hole 221. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "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 a limitation on the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The utility model discloses an inner star wheel mold capable of radial demoulding, referring to Figures 1 to 5 , comprising an upper die set and a lower die set, wherein the lower die set comprises a lower die plate 1, an outer die 2, an inner die 3, a reset device 4, a lower punch 5 and a material ejector rod 6. The outer die 2 is fixed on the top of the lower die plate 1, and the inner wall of the die cavity of the outer die 2 is set to a tapered shape that is wide at the top and narrow at the bottom. The inner die 3 is arranged in the die cavity of the outer die 2 and is in close contact with the outer die 2. The outer side wall of the inner die 3 is set to the same inclination angle as that of the outer die cavity. The inner die 3 is a split structure, and a plurality of connecting through holes 31 are set on the inner die 3, which are connected from top to bottom. The upper part of the connecting through hole 31 is coaxially set to a fixing groove 32 with a diameter larger than that of the connecting through hole 31. The reset device 4 includes a guide column 41 and a fixing spring 42. The lower end of the guide column 41 passes through the connecting through hole 31 and is fixed downward. The upper end of the guide column 41 extends into the fixing groove 32 and does not extend out of the inner mold 3. One end of the fixing spring 42 is fixed to the bottom of the fixing groove 32, and the other end of the fixing spring 42 is fixed to the top of the guide column 41. The diameter of the fixing spring 42 is larger than the diameter of the connecting through hole 31.

[0034] When demoulding, the inner mold 3 moves upward along the guide pillar 41 and presses the fixing spring 42 . After the workpiece is released, the inner mold 3 returns to its original position under the action of the fixing spring 42 .

[0035] In one embodiment, the inner mold 3 includes a plurality of cut blocks 33 formed by combining, the number of the cut blocks 33 corresponds to the number of ball grooves on the workpiece, the connection positions of adjacent cut blocks 33 are arranged at the positions of the ball grooves corresponding to the workpiece, and each of the cut blocks 33 is provided with a connecting through hole 31.

[0036] The connecting through hole 31 is parallel to the outer side wall of the inner mold 3 , and the inclination angle of the connecting through hole 31 is the same as the inclination angle of the outer side wall of the inner mold 3 .

[0037] In one embodiment, the outer mold 2 is provided with a positioning groove 21 below the mold cavity thereof, a positioning sleeve 22 is provided in the positioning groove 21 , and the lower end of the guide pillar 41 is fixed on the positioning sleeve 22 .

[0038] A boss 411 is provided at the lower end of the guide column 41 , and a step hole 221 is provided on the positioning sleeve 22 . The guide column 41 is fixed to the step hole 221 of the positioning sleeve 22 through the boss 411 structure. The step hole 221 and the connecting through hole 31 are coaxially arranged.

[0039] The top width of the positioning groove 21 is greater than the bottom width of the mold cavity of the outer mold 2 , and the positioning sleeve 22 is fixed in the positioning groove 21 .

[0040] The top end of the lower punch 5 passes through the positioning sleeve 22 and extends into the mold cavity of the outer mold 2 . The ejector rod 6 passes through the lower mold plate 1 and abuts against the bottom of the lower punch 5 . The ejector rod 6 controls the lifting and lowering of the lower punch 5 .

[0041] When the cut block slides upward and outward during material withdrawal, the cut block is always subject to the compression force of the fixed spring. When the inner star wheel completely leaves the inner mold cavity, the cut block slides downward and inward along the guide column through the force provided by the fixed spring and quickly returns to its original state.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0043] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. An inner star wheel mold capable of radial demoulding, comprising an upper mold assembly and a lower mold assembly, characterized in that: The lower mold assembly includes a lower mold plate, an outer mold, an inner mold and a reset device. The outer mold is fixed on the top of the lower mold plate, and the inner wall of the mold cavity of the outer mold is set to a tapered shape that is wide at the top and narrow at the bottom. The inner mold is arranged in the mold cavity of the outer mold and is in close contact with the outer mold. The outer side wall of the inner mold is arranged at the same inclination angle as the mold cavity of the outer mold. The inner mold is a split structure. A plurality of connecting through holes are arranged on the inner mold, and the upper part of the connecting through hole is coaxially arranged as a fixing groove with a diameter larger than the connecting through hole. The reset device includes a guide column and a fixing spring, the lower end of the guide column passes through the connecting through hole and is fixed downward, the upper end of the guide column extends into the fixing groove and does not extend out of the inner mold, one end of the fixing spring is fixed to the bottom of the fixing groove, and the other end of the fixing spring is fixed to the top of the guide column, and the diameter of the fixing spring is larger than the diameter of the connecting through hole. When demoulding, the inner mold moves upward along the guide column and squeezes the fixed spring. After the workpiece is separated, the inner mold returns to its original position under the action of the fixed spring.

2. The radially demouldable inner star wheel mold according to claim 1, characterized in that: The inner mold includes a plurality of blocks formed by combination, the number of the blocks corresponds to the number of ball grooves on the workpiece, the connection positions of adjacent blocks are arranged at the positions of the ball grooves corresponding to the workpiece, and each block is provided with a connecting through hole.

3. The radially demouldable inner star wheel mold according to claim 2, characterized in that: The connecting through hole is parallel to the outer side wall of the inner mold, and the inclination angle of the connecting through hole is the same as the inclination angle of the outer side wall of the inner mold.

4. The radially demouldable inner star wheel mold according to claim 1, characterized in that: The outer mold is provided with a positioning groove below its mold cavity, a positioning sleeve is provided in the positioning groove, and the lower end of the guide column is fixed on the positioning sleeve.

5. The radially demouldable inner star wheel mold according to claim 4, characterized in that: A boss is provided at the lower end of the guide column, a step hole is provided on the positioning sleeve, the guide column is fixed on the step hole of the positioning sleeve through the boss structure, and the step hole and the connecting through hole are coaxially arranged.

6. The radially demouldable inner star wheel mold according to claim 4, characterized in that: The top width of the positioning groove is greater than the bottom width of the outer mold cavity, and the positioning sleeve is fixed in the positioning groove.

7. The radially demouldable inner star wheel mold according to claim 4, characterized in that: It also includes a lower punch and a material return rod. The top of the lower punch passes through the positioning sleeve and extends into the mold cavity of the outer mold. The material return rod passes through the lower mold plate and abuts against the bottom of the lower punch. The material return rod controls the lifting and lowering of the lower punch.

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