A hub spinning die

Abstract

The present application relates to the technical field of automobile wheel hub die, in particular to a wheel hub spinning die, comprising: a lower die assembly and a pressing plate (9) for pressing a wheel hub casting on the lower die assembly; the pressing plate (9) has a spoke top pressing surface for pressing spokes in the wheel hub casting. The present application provides a wheel hub spinning die which can press the casting and will not cause deformation of the spokes of the casting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile wheel hub molds, in particular to a wheel hub spinning mold. BACKGROUND

[0002] As one of the three main processes for wheel hub manufacturing, the spinning process technology combines various technical features of forging, extrusion, stretching, cross rolling, and rolling. The wheel hub cast using the spinning process has multiple advantages such as good quality, high flexibility, lightweight, and strong rigidity. The spinning-formed wheel hub not only has a thinner wall thickness than the conventional low-pressure casting, but also has a lighter weight, less material, and a more compact structure with better mechanical properties.

[0003] The spinning process is to position and install the wheel hub spinning casting on the spinning mold, and the spinning mold drives the wheel hub spinning casting to rotate, while the spinning knife performs rotary stamping on the rim part.

[0004] The structure of the spinning mold is shown in Figure 1 The spinning mold includes a lower mold assembly and a pressing plate 9 for pressing the casting against the lower mold assembly. The lower mold assembly includes a fixed bottom die 5 and a top die 6 assembled in the bottom die 5 in the up-down direction. The pressing plate 9 is pressed against the flange protruding upward from the edge of the casting.

[0005] In the prior art, the pressing plate 9 only applies pressure through the flange, and the following defects exist during the machining process: 1. The downward pressure of the pressing plate 9 is concentrated on the flange, and the flange has a small force area, resulting in pressure concentration and easy collapse of the flange; 2. The spoke is deformed after being stressed, and the deformation occurs at the R-angle position 18 where the spoke is attached to the mold; 3. The casting is prone to slipping during the spinning process, resulting in the phenomenon of casting rotation loss and damage to the back cavity of the wheel spoke. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art and provide a wheel hub spinning mold that can press the casting without causing deformation of the spoke.

[0007] To achieve the above-mentioned purpose, the technical solution of the present application is as follows:

[0008] A wheel hub spinning mold includes a lower mold assembly and a pressing plate (9) for pressing the wheel hub casting against the lower mold assembly. The pressing plate (9) has a spoke top pressing surface for pressing the spoke of the wheel hub casting.

[0009] As a preferred technical solution of the present application, the spoke top pressing surface is provided with an edge avoidance structure for avoiding the edges on the spoke top surface.

[0010] As a preferred technical solution of the present application, the edge avoidance structure is an avoidance groove provided on the spoke top pressing surface.

[0011] As a preferred technical solution of the present application, the height of the avoiding groove is 1-5 mm.

[0012] As a more preferred technical solution of the present application, the height of the avoiding groove is 2 mm.

[0013] As a preferred technical solution of the present application, the edge of the pressing plate is provided with an annular recess for avoiding the wheel rim protruding upward in the wheel hub casting, and the annular recess has a pressing surface for pressing the wheel rim. The annular recess can avoid the wheel rim from collapsing due to the increased stress caused by the protrusion.

[0014] As a preferred technical solution of the present application, the lower die assembly comprises a fixedly arranged bottom die and a top material die arranged in the bottom die in the up-down direction.

[0015] The top material die is fixedly provided with a core shaft extending upward, the core shaft is used for penetrating the center hole of the wheel hub, and the pressing plate is fixedly provided with a positioning block, and the bottom of the positioning block is provided with a positioning groove or a positioning hole for the core shaft to penetrate.

[0016] As a preferred technical solution of the present application, the lower die assembly comprises a fixedly arranged bottom die and a top material die arranged in the bottom die in the up-down direction.

[0017] The top material die is arranged in the bottom die in the up-down direction, and the top material assembly and the bottom die are assembled together.

[0018] As a preferred technical solution of the present application, the top material assembly comprises a lower top material rod connected with the top material mechanism, an upper top material rod connected with the top material die, and a connecting block connecting the lower top material rod and the upper top material rod.

[0019] As a preferred technical solution of the present application, the bottom die is provided with a through hole for the upper top material rod to penetrate, and grooves are arranged on the side surface of the lower top material rod and the inner wall surface of the through hole in correspondence, and the wheel hub spinning die further comprises a limiting block penetrating into the two grooves to realize the rotation-stopping assembly of the lower top material rod and the bottom die.

[0020] As a preferred technical solution of the present application, the bottom of the bottom die is fixedly provided with a bottom die seat, and the connecting block is rotation-stoppingly guided and assembled on the bottom die seat.

[0021] As a preferred technical solution of the present application, a spring is press-fitted between the connecting block and the bottom die, and the spring is used for applying an elastic force downward to the connecting block. The spring can make the top material die return faster, and can also prevent the top material die from impacting the bottom die when moving up and down, thereby preventing the die from being damaged.

[0022] Beneficial effects:

[0023] The present application ensures reliable pressing of the cast spoke by increasing the clamping force area of the pressing plate and the hub. The pressing plate is designed to be in close contact with the hub spoke and hub core which need to be reprocessed (such as bright finishing) on the lower surface, which solves the problem of the existing technology that the pressing plate only clamps the hub at the rim, and the small force area in the spinning process causes the rim to collapse, the hub core to float, and other chain problems. Because of insufficient clamping force, the castings cannot be pressed, which further causes the spokes to deform and batch waste products.

[0024] The present application solves the problems of spoke R angle collapse and deformation and the indentation on the spoke R angle which is difficult to remove after processing by setting an empty slot at the position corresponding to the spoke R angle of the pressing plate. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of the existing spinning die;

[0027] Figure 2 It is a structural schematic diagram of the pressing plate 9;

[0028] Figure 3 It is a sectional view of the spinning die along the A-A direction of Figure 2 ;

[0029] Figure 4 It is a partial enlarged view of A in Figure 3 ;

[0030] Figure 5 It is a top view structural schematic diagram of the upper connecting rod 3 and the limiting block 10 of the present application;

[0031] Figure 6 It is a sectional structural schematic diagram along the B-B direction. Figure 5

[0032] Reference signs: 1, bottom die seat; 2, lower ejector rod; 3, upper ejector rod; 4, connecting block; 5, bottom die; 6, ejector die; 7, core shaft; 8, positioning block; 9, pressing plate; 10, limiting block; 11, spring; 12, empty slot; 13, annular recess; 14, cavity; 15, hollow position; 16, bolt; 17, mounting surface; 18, spoke and die close R angle position; 19, rim. DETAILED DESCRIPTION

[0033] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Those skilled in the art should know that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] Since the spinning process needs to be carried out at high temperature, the castings spun are hot and are prone to deformation due to uneven stress. The pressing plate 9 of the existing spinning die mostly only presses the castings at the rim part, and the clamping stress area is small, which is prone to problems such as rim collapse, bulging deformation of the castings spoke and the stress point of the die (the deformation is mostly at the R corner position 18 of the spoke and the die). During the spinning process, the castings are prone to rotation due to large machining stress and tool engagement, which causes the spoke back cavity of the castings to be scratched.

[0035] In order to solve the above problems, the top pressing surface of the pressing plate 9 is in contact with the spoke of the casting, and an edge avoidance structure is arranged on the top pressing surface of the pressing plate 9 for avoiding the highest point of the spoke (i.e. the R corner of the spoke). The improved spinning die is used for production, and the produced products no longer have the above problems, and the unqualified rate is 0, which greatly improves the production efficiency and saves the production cost.

[0036] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be specifically introduced. Any element quantity in the drawings is used for example and is not limited, and any naming is only used for distinction and does not have any limiting meaning.

[0037] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0038] Embodiment 1 of the hub spinning die provided by the present application:

[0039] As shown in Figures 2-3 , it comprises a bottom die seat 1, a bottom die 5, a top material die 6, a pressing plate 9 and a top material assembly; the bottom die 5 is fixedly arranged above the bottom die seat 1; the top material die 6 is slidably assembled in the middle of the bottom die 5 in the up-down direction; the top material assembly is arranged below the top material die 6, and the top material assembly penetrates through the bottom die 5 and the bottom die seat 1, and the top material assembly movably penetrates into the bottom die 5 and the bottom die seat 1 to drive the top material die 6 to move up and down, so as to realize the separation of the top material die 6 and the casting; the pressing plate 9 is located above the bottom die 5, and the pressing plate 9 is used to press the hub casting tightly on the bottom die 5.

[0040] In order to increase the clamping force area of the pressing plate 9 and the hub casting, prevent the casting from slipping during the spinning process, and cause the casting to lose the rotation problem, the lower surface of the pressing plate 9 is divided into spoke top pressing surface and rim top pressing surface from inside to outside, the spoke top pressing surface corresponds to the spoke position in the hub and is used for pressing the spoke, and the rim top pressing surface is located at the edge position of the pressing plate and is used for pressing the rim 19.

[0041] In order to prevent the spoke top surface corner (i.e. the highest point of the spoke or the spoke R corner) from being pressed and deformed, and the indentation on the spoke corner after processing is still difficult to remove, the spoke top pressing surface is provided with a corner avoiding structure for avoiding the spoke side surface corner.

[0042] In order to avoid the rim, the rim top pressing surface is provided with an annular recess 13, the annular recess 13 is used for the rim to extend into, and the top surface of the annular recess 13 is used for pressing the rim and is the pressing surface.

[0043] An embodiment 2 of the hub spinning die provided by the application:

[0044] The difference between the embodiment 1 and the embodiment 2 is mainly that:

[0045] The material pushing assembly comprises an upper material pushing rod 3, a lower material pushing rod 2 and a connecting block 4, the upper material pushing rod 3 and the lower material pushing rod 2 are connected and fixed together through the connecting block 4, and the upper end of the upper material pushing rod 3 is connected with the material pushing die 6. In the embodiment, the components are connected together through bolts.

[0046] The bottom die 5 is fixedly arranged above the bottom die seat 1 through bolts. The bottom die 5 is provided with a recess at the top center position for assembling the material pushing die 6. The material pushing die 6 is provided with a wheel core avoiding groove at the top center position, the wheel core avoiding groove is used for avoiding the wheel core mounting surface 17, and the top four arcs of the material pushing die 6 are matched with the corresponding inner surface of the casting. When the casting is positioned and pressed by the pressing plate 9, the top four arcs of the inner surface of the casting are in close contact with the top of the bottom die 5 and the material pushing die 6, and the top center position of the inner surface of the casting is not in contact with the wheel core avoiding groove of the material pushing die 6.

[0047] The material pushing die 6 is fixedly arranged at the top center position and is connected with the core shaft 7 through bolts in the embodiment. The upper end of the core shaft 7 extends upward for penetrating the center hole of the casting, i.e. the wheel core, to position the casting.

[0048] The pressing plate 9 is provided with a through hole penetrating upward and downward in the middle, and the through hole is assembled with a positioning block 8. The positioning block 8 is provided with a positioning groove at the bottom center position, which is matched with the core shaft 7 to facilitate the positioning and installation of the pressing plate 9. The lower end of the positioning block 8 is kept a certain distance from the center of the casting, i.e. the positioning block 8 is not in contact with the casting. The positioning block 8 and the core shaft 7 are arranged on one hand to facilitate the assembly of the pressing plate 9 and the bottom die 5, and on the other hand to position the center of the pressing plate 9 and the bottom die 5, so as to ensure the coaxiality of the pressing plate 9, the casting and the bottom die 5. In other embodiments, a positioning hole can be formed at the bottom center position of the positioning block 8 for the core shaft 7 to penetrate.

[0049] In the embodiment, as shown in the figure, the corner avoiding structure is an avoiding groove 12 arranged on the top pressing surface of the spoke. Figure 4 The height of the avoiding groove 12 is 1mm. In other embodiments, the actual size and shape of the corner avoiding structure can also be set according to actual conditions, such as square, oval, circular or even irregular shape, as long as it matches the shape of the spoke R corner and can avoid the spoke R corner, which is not limited here. In other embodiments, the corner avoiding structure can also be an avoiding hole through the pressing plate from top to bottom.

[0050] Embodiment 3 of the hub spinning die provided by the application:

[0051] The difference between the embodiment and embodiment 2 is mainly that:

[0052] The through hole in the middle of the pressing plate 9 is arranged in a way that it is wide at the top and narrow at the bottom, and its cross section is arranged in a "T" shape. The positioning block 8 is integrally formed by an upper cylinder and a lower cylinder, the diameter of the upper cylinder is larger than that of the lower cylinder, and the lower cylinder is arranged at the bottom center of the upper cylinder. The upper cylinder of the positioning block 8 is fixedly connected with the upper end of the through hole of the pressing plate 9, and the lower cylinder is arranged between the through hole of the pressing plate 9 and the side surface of the lower cylinder. A positioning groove is arranged at the bottom center of the lower cylinder, which is used to assemble the mandrel 7 to facilitate the positioning and installation of the pressing plate 9. The pressing plate 9 is assembled with the mandrel 7 through the positioning block 8 arranged in the middle of the pressing plate 9, which ensures the coaxiality of the pressing plate 9, the bottom die 5 and the top material die 6, and prevents the casting from being pressed off center.

[0053] The upper end and the lower end of the upper material ejecting rod 3 are both provided with protrusions at the center, and the top material die 6 is provided with a through hole at the center, which is used to assemble with the upper end protrusion of the upper material ejecting rod 3. The connecting block 4 is arranged in a hollow cylindrical shape, and the lower end protrusion of the upper material ejecting rod 3 is assembled with the hollow of the connecting block 4. This arrangement ensures the coaxiality of the material ejecting assembly and the top material die 6.

[0054] The height of the avoiding groove 12 is 2mm.

[0055] Embodiment 4 of the hub spinning die provided by the application:

[0056] The difference between the embodiment and embodiment 3 is mainly that:

[0057] The upper ejector rod 3 is integrally formed by multiple concentric cylinders with different diameters, the upper and lower cylinders have the same diameter, the middle cylinder has a smaller diameter than the upper and lower cylinders, and the protrusions at the center positions of the upper and lower cylinders are also cylinders. A groove is provided on the side surface of the upper cylinder, which penetrates through the two bottom surfaces of the upper cylinder, i.e., the length of the groove is consistent with the height of the cylinder. A limiting block 10 adapted to the groove is assembled in the groove, and the limiting block 10 protrudes from the side surface of the cylinder. A groove is also provided on the inner wall of the through hole in the ejector die 6 for the upper ejector rod 3 to pass through, and the limiting block 10 is also inserted into the groove of the ejector die 6, thereby ensuring the rotation-stopping assembly of the ejector die 6 and the upper ejector rod 3.

[0058] The coaxial design of the limiting block 10 and the pressing plate 9 with the bottom die 5 can prevent the rotation of the ejector die 6 alone during the spinning process.

[0059] The lower cylinder of the upper ejector rod 3 is fixedly connected with the connecting block 4, and the cylinder protrusion at the lower end of the lower cylinder is assembled in the hollow of the connecting block 4. The diameter of the lower cylinder of the upper ejector rod 3 is smaller than the outer diameter of the connecting block 4. A spring 11 is provided above the connecting block 4, which is used to prevent the connecting block 4 from colliding with the bottom die 5 when the ejector assembly moves up and down. The spring 11 is longitudinally arranged, one end of the spring 11 is arranged above the connecting block 4, and the other end is arranged below the through hole of the bottom die 5. The middle through hole of the bottom die 5 is arranged in a stepped shape with a narrow upper part and a wide lower part. The spring 11 can make the return speed of the ejector die 6 faster, and can also prevent the ejector die 6 from generating a large impact with the bottom die 5 when moving up and down, thereby preventing the mold from being damaged.

[0060] The height of the air avoidance groove 12 is 3mm.

[0061] An embodiment 5 of the hub spinning die provided by the present application is as follows:

[0062] The main difference between the embodiment 5 and the embodiment 4 is as follows:

[0063] As shown in Figures 5-6 , the limiting block 10 is arranged as a long strip, and the limiting block 10 is fixed with the groove of the upper ejector rod 3 by a bolt 16. The limiting block 10 and the upper ejector rod 3 form an irregular body, and the bottom die 5 is provided with a cavity adapted to the irregular body.

[0064] The spring 11 is arranged in multiple, and the multiple springs 11 are uniformly distributed around the top of the connecting block 4.

[0065] The mandrel 7 is integrally formed by two concentric but different diameter cylinders, the upper cylinder of the mandrel 7 has a smaller diameter than the lower cylinder, and the cross section of the mandrel 7 is in the shape of an inverted "T". The lower cylinder of the mandrel 7 is fixedly connected with the upper material ejection die 6 and the upper cylinder of the upper material ejection rod 3 through bolts, and the lower cylinder of the upper material ejection rod 3 is fixedly connected with the connecting block 4 and the lower material ejection rod 2 through bolts. When the spinning die rotates, the material ejection die 6 rotates together with the material ejection assembly. The limiting block 10 is used to limit the material ejection die 6 from rotating alone from the bottom die 5.

[0066] The cavity 14 is arranged between the bottom die 5 and the material ejection die 6, and a plurality of hollowed-out positions 15 are arranged above the pressing plate 9. The cavity and the hollowed-out position are used to reduce the weight of the die, and the more hollowed-out the die is, the lighter the overall weight is, the better the weight reduction is, and the spinning die is convenient to operate, install and disassemble.

[0067] The height of the avoidance groove 12 is 5mm.

[0068] The present application solves the defects that the existing spinning die cannot press the casting by pressing the formed hub on the bottom die 5 and the material ejection die 6 of the spinning die through the pressing plate 9, and the lower surface of the pressing plate 9 is in close contact with the hub spoke; the problem that the distance between the center height of the mounting disc and the center of the rim is deviated, the spoke R angle is deformed and pressed, and the spoke R angle has a mark that is difficult to remove after processing when the lower surface of the pressing plate 9 is in close contact with the hub spoke and the hub core without the avoidance groove 12 arranged at the position corresponding to the spoke R angle of the lower surface of the pressing plate 9.

[0069] In use, the center hole of the hub casting to be formed by spinning is positioned through the mandrel 7 at the center of the bottom die 5, and the inner surface of the casting is in contact with the upper surface of the bottom die 5 and the material ejection die 6 of the spinning die; the pressing plate driving device drives the pressing plate 9 to move downward to press the casting, and the middle positioning block 8 of the pressing plate 9 is positioned and assembled with the mandrel 7 to position and press the casting between the bottom die 5 and the pressing plate 9.

[0070] After the casting is pressed, the spinning wheel rotates to perform spinning processing. After the spinning processing is completed, the pressing plate 9 moves upward, the driving device drives the material ejection assembly to move upward, the material ejection die 6 is separated from the bottom die 5, and the hub casting is demolded.

[0071] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "top", "bottom", "inner" and the like, which indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not mean or imply that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0072] Also in the description of the specification, the meaning of "a plurality of" is at least two, for example, two, three or more, etc., unless explicitly and specifically defined otherwise.

Claims

1. A hub spinning die, comprising: The lower mold assembly and a pressing plate (9) for pressing the hub casting against the lower mold assembly; characterized in that the pressing plate (9) has spoke pressing surfaces for pressing spokes in the hub casting; the spoke pressing surfaces are provided with corner avoiding structures for avoiding corners on the spoke pressing surfaces; the corner avoiding structures are avoiding grooves (12) provided on the spoke pressing surfaces; the edge of the pressing plate (9) is provided with an annular recess (13) for avoiding a flange (19) protruding upward in the hub casting, the annular recess (13) has a pressing surface for pressing the flange (19).

2. A hub spinning die as claimed in claim 1, wherein The lower mold assembly comprises a fixedly arranged bottom mold and a top material mold arranged in the bottom mold in the up-down direction; the top material mold is fixedly provided with a core shaft extending upward, the core shaft is used for penetrating the center hole of the hub, the pressing plate is fixedly provided with a positioning block, the bottom of the positioning block is provided with a positioning groove or a positioning hole for the core shaft to penetrate.

3. A hub spinning die as defined in claim 1 wherein, The lower mold assembly comprises a fixedly arranged bottom mold and a top material mold arranged in the bottom mold in the up-down direction; the top material mold is provided with a top material assembly arranged in the bottom mold in the up-down direction, and the top material assembly and the bottom mold are assembled together.

4. A hub spinning die as defined in claim 3 wherein, The top material assembly comprises a lower top material rod connected with the top material mechanism, an upper top material rod connected with the top material mold, and a connecting block connecting the lower top material rod and the upper top material rod.

5. A hub spinning die as defined in claim 4 wherein, The bottom mold is provided with a through hole through which the upper top material rod penetrates, and grooves are correspondingly arranged on the side surface of the lower top material rod and the inner wall surface of the through hole; the hub spinning mold further comprises a limiting block penetrating into the two grooves to realize the rotation-stopping assembly of the lower top material rod and the bottom mold.

6. A hub spinning die as defined in claim 4 wherein, The bottom of the bottom mold is fixedly provided with a bottom mold seat, and the connecting block is rotation-stoppingly guided and assembled on the bottom mold seat.

7. A hub spinning die as defined in claim 4 wherein, A spring is press-fitted between the connecting block and the bottom mold, and the spring is used for applying an elastic force downward to the connecting block.

Images