A forming process for an automobile wheel hub bearing flange

Abstract

The present application relates to the technical field of hub bearing, and discloses a forming process of automobile hub bearing flange, which comprises the following steps: placing a heated to-be-forged part into a die cavity of a forging die; wherein the die cavity has an outer diameter with a round corner a, and the radius of the round corner a is 3 mm; and using a stamping mechanism to forge the to-be-forged part to obtain a hub bearing flange; wherein the hub bearing flange has a first part corresponding to the outer diameter of the die cavity, and the present application proposes adding a round corner b to the outer diameter of the die cavity, so that the first part of the hub bearing flange has a round corner b corresponding to the round corner a, and no burr occurs during subsequent machining due to the existence of the round corner b, thereby solving the burr problem after machining. The process method mainly changes the die structure, simultaneously reduces a manual deburring process, and also improves the appearance of the product. The process method fully meets the product quality requirements of the automobile industry for this type of hub bearing.

Description

Technical Field

[0001] This invention relates to the field of wheel hub bearing technology, specifically to a forming process for automotive wheel hub bearing flanges. Background Technology

[0002] Wheel hub bearings are components used in automobile axles to bear weight and provide precise guidance for the rotation of the wheel hub. They withstand both axial and radial loads and are an important part of the vehicle's load-bearing and rotation. Wheel hub bearings consist of a flange mandrel with an outer and inner ring. Flange mandrels come in both solid and hollow structures, with hollow flange mandrels mating with the drive shaft.

[0003] Since the inner ring of automotive wheel hub bearing flanges is basically reinforced with ribs and the side of the ribs is unmachined, sharp burrs are easily produced after the outer diameter of the flange is machined. Usually, the burrs are removed by chamfering. However, because such products have unmachined surfaces with ribs, the chamfering process may turn into the ribs. The burrs can only be removed by manual grinding afterward, which affects the appearance and quality of the product and also affects the production cost. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a forming process for automotive wheel hub bearing flanges. This process solves the problem that sharp burrs easily appear after machining the outer diameter of the flange. Due to the presence of reinforcing ribs on non-machined surfaces, the chamfering process may accidentally machine the reinforcing ribs, requiring subsequent manual grinding to remove the burrs, which affects the product's appearance and quality, as well as production costs.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a forming process for an automotive wheel hub bearing flange, comprising:

[0008] The heated part to be forged is placed into the mold cavity of the forging die;

[0009] The mold cavity has an outer diameter, and the outer diameter has a fillet α with a radius of 3 mm.

[0010] The wheel hub bearing flange is obtained by forging the part to be forged using a stamping mechanism;

[0011] The hub bearing flange has a first part, which corresponds to the outer diameter of the mold cavity, such that the first part of the hub bearing flange has a fillet b corresponding to the fillet a.

[0012] A forming process for automotive wheel hub bearing flanges includes:

[0013] Lower mold and upper mold;

[0014] A mold cavity is formed on the top of the lower mold. The mold cavity has an outer diameter, which is located at the upper part of the mold cavity and is annular in shape.

[0015] The fillet 'a' is located at the bottom of the outer side wall of the outer diameter.

[0016] The upper mold cavity is located at the bottom of the upper mold, and the top of the upper mold cavity is connected to the upper mold boss.

[0017] Preferably, a plurality of support rods are connected between the lower mold and the upper mold, and the connection between the support rods and the lower mold is a sliding connection.

[0018] Preferably, the lower mold has multiple first sliding grooves on both sides, and the support rod has a first slider that is slidably sleeved with the first sliding groove on one side.

[0019] Preferably, a first positioning rod is fixedly connected to the bottom of the first groove, and a bottom opening adapted to the first positioning rod is provided on the outer side wall of the first slider.

[0020] Preferably, the upper mold has a second sliding groove on each side, a second slider is fixedly connected to one side of the support rod and slidably fitted with the second sliding groove, a second positioning rod is fixedly connected to the top of the second sliding groove, a top opening is opened on one side of the second slider and slidably fitted with the second positioning rod, the first slider and the second slider are round blocks, the bottom of the second positioning rod and the second sliding groove have a preset distance for the second slider to rotate, and the top of the first positioning rod and the first sliding groove have a preset distance for the first slider to rotate.

[0021] This invention addresses the issue that automotive wheel bearing flanges typically have reinforcing ribs on their inner rings, with the rib side being a non-machined surface. This leads to sharp burrs easily appearing after machining the flange's outer diameter. While chamfering is commonly used to remove these burrs, the presence of the reinforcing ribs during chamfering can cause damage to the ribs themselves, necessitating subsequent manual grinding to remove the burrs. This affects product appearance, quality, and production costs. The invention proposes adding a fillet 'b' to the outer diameter of the mold cavity. This fillet 'b' corresponds to the fillet 'a' on the first part of the wheel bearing flange. During subsequent machining, the fillet 'b' prevents burrs from appearing, resolving the burr issue after machining. This process primarily modifies the mold structure and reduces one manual deburring step, improving the product's appearance. It fully meets the automotive industry's quality requirements for this type of wheel bearing. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the workpiece structure after forging using a forging die in the prior art;

[0023] Figure 2 This is a schematic diagram of the workpiece structure after forging using the forging die of the present invention;

[0024] Figure 3 This is a schematic diagram of the forging die structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the upper mold structure of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of the forging die structure of the present invention;

[0027] Figure 6 for Figure 5 Enlarged schematic diagram of the local structure at point A;

[0028] Figure 7 This is a schematic diagram of the lower mold structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the hub bearing flange structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the support structure of the present invention.

[0031] In the diagram: 100, lower mold; 101, mold cavity; 102, upper mold; 103, outer diameter; 104, fillet a; 105, upper mold boss; 106, upper mold cavity; 200, wheel hub bearing flange pan; 201, first part; 202, fillet b; 300, support rod 300; 301, first slide groove; 302, first slider; 303, first positioning rod; 304, bottom opening; 305, second slide groove; 306, second slider; 307, second positioning rod; 308, top opening. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-9 A forming process for automotive wheel hub bearing flanges, comprising:

[0034] The heated part to be forged is placed into the mold cavity 101 of the forging mold;

[0035] The mold cavity 101 has an outer diameter 103, and the outer diameter 103 has a fillet a104 with a radius of 3mm.

[0036] The wheel hub bearing flange 200 is obtained by forging the part to be forged using a stamping mechanism;

[0037] The hub bearing flange 200 has a first part 201, which corresponds to the outer diameter 103 of the mold cavity 101, so that the first part 201 of the hub bearing flange 200 has a fillet b202 corresponding to the fillet a104.

[0038] A forming process for automotive wheel hub bearing flanges includes:

[0039] Lower mold 100 and upper mold 102;

[0040] The mold cavity 101 is opened on the top of the lower mold 100. The mold cavity 101 has an outer diameter 103, which is located at the upper part of the mold cavity 101 and is in the shape of a ring.

[0041] The fillet a104 is located at the bottom of the outer wall of the outer diameter 103;

[0042] The upper mold cavity 106 is located at the bottom of the upper mold 102, and the top of the upper mold cavity 106 is connected to the upper mold boss 105.

[0043] As a further aspect of the present invention, a plurality of support rods 300 are connected between the lower mold 100 and the upper mold 102, and the connection between the support rods 300 and the lower mold 100 is a sliding connection;

[0044] By setting the support rod 300, the operator can move the upper mold 102 upward during use to expose the mold cavity 101, making it convenient for the operator to place the part to be forged into the mold cavity 101. At the same time, it also enhances the connection between the upper mold 102 and the lower mold 100, so as to prevent the upper mold 102 and the lower mold 100 from being separated when the mold is not in use, and the situation where one of the upper mold 102 and the lower mold 100 is lost when it is taken out.

[0045] As a further embodiment of the present invention, a plurality of first sliding grooves 301 are respectively provided on both sides of the lower mold 100, and a first slider 302 that is slidably sleeved with the first sliding groove 301 is fixedly connected to one side of the support rod 300.

[0046] By setting the first slider 302, after the operator places the part to be forged into the mold cavity 101, the upper mold 102 can be moved downward so that the upper mold boss 105 is embedded in the part to be forged. When the operator applies pressure to the upper mold 102 using the stamping mechanism, the first slider 302 and the first slide groove 301 can restrict the movement position of the upper mold 102, thereby avoiding the situation where the upper mold 102 is displaced during stamping, resulting in stamping failure.

[0047] As a further embodiment of the present invention, a first positioning rod 303 is fixedly connected to the bottom of the first slide groove 301, and a bottom opening 304 adapted to the first positioning rod 303 is provided on the outer side wall of the first slider 302.

[0048] By setting the first positioning rod 303, when the first slider 302 slides in the first groove 301, the first positioning rod 303 can restrict the position of the first slider 302, thereby achieving the effect of restricting the position of the upper mold 102 as mentioned above.

[0049] As a further embodiment of the present invention, the upper mold 102 is provided with second sliding grooves 305 on both sides, and a second slider 306 that is slidably sleeved with the second sliding groove 305 is fixedly connected to one side of the support rod 300. A second positioning rod 307 is fixedly connected to the top of the second sliding groove 305. A top opening 308 that is slidably sleeved with the second positioning rod 307 is provided on one side of the second slider 306. The first slider 302 and the second slider 306 are round blocks. There is a preset distance between the bottom of the second positioning rod 307 and the second sliding groove 305 for the second slider 306 to rotate. There is a preset distance between the top of the first positioning rod 303 and the first sliding groove 301 for the first slider 302 to rotate.

[0050] By setting the second slider 306, when it is necessary to place the part to be forged in the mold cavity 101, the operator can pull the upper mold 102 upward, so that the first slider 302 disengages from the first positioning rod 303 and the second slider 306 disengages from the second positioning rod 307. At this time, the position of the upper mold 102 can be moved so that the upper mold boss 105 disengages from the mold cavity 101 and moves away from the mold cavity 101, so as to facilitate the subsequent placement of the part to be cast into the mold cavity 101 and the removal of the forged workpiece. Compared with directly sliding the upper mold 102 and the lower mold 100 in a straight line, the above setting can avoid the situation where the upper mold boss 105 is insufficient for placing the part to be forged when the straight sliding connection is made, and can also reduce the length of the support rod 300 set when the upper mold 102 and the lower mold 100 are set in a straight sliding connection.

[0051] The specific operating principle of this equipment is as follows: Since the inner ring of automotive wheel bearing flanges typically has reinforcing ribs with the rib side being a non-machined surface, sharp burrs easily appear after machining the outer diameter of the flange. Usually, these burrs are removed by chamfering. However, due to the presence of the non-machined surface of the reinforcing ribs, chamfering during machining may accidentally cut into the ribs, requiring subsequent manual grinding to remove the burrs, affecting product appearance and quality, and also increasing production costs. This invention proposes adding a fillet b202 to the outer diameter 103 of the mold cavity 101, so that the first part 201 of the wheel bearing flange 200 has a fillet b202 corresponding to the fillet a104. During subsequent machining, the fillet b202 prevents burrs from appearing, solving the problem of burrs after machining. This process mainly modifies the mold structure and reduces a manual deburring step, thus improving the product appearance. It fully meets the product quality requirements of the automotive industry for this type of wheel bearing.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A forming process for automotive wheel hub bearing flanges, characterized in that, include: The heated part to be forged is placed into the mold cavity (101) of the forging die; The mold cavity (101) has an outer diameter (103), the outer diameter (103) has a fillet a (104), and the radius of the fillet a (104) is 3mm; The wheel hub bearing flange (200) is obtained by forging the part to be forged using a stamping mechanism. The hub bearing flange (200) has a first part (201) that corresponds to the outer diameter (103) of the mold cavity (101), such that the first part (201) of the hub bearing flange (200) has a fillet b (202) that corresponds to the fillet a (104). The forging die includes: Lower mold (100) and upper mold (102); A mold cavity (101) is formed on the top of the lower mold (100). The mold cavity (101) has an outer diameter (103), which is located at the upper part of the mold cavity (101) and is in the shape of a ring. Rounded corner a (104) is located at the bottom of the outer wall of the outer diameter (103); The upper mold cavity (106) is located at the bottom of the upper mold (102), and the top of the upper mold cavity (106) is connected to the upper mold boss (105). A plurality of support rods (300) are connected between the lower mold (100) and the upper mold (102), and the connection between the support rods (300) and the lower mold (100) is a sliding connection; The lower mold (100) has multiple first grooves (301) on both sides. The support rod (300) has a first slider (302) that is slidably sleeved with the first groove (301) on one side. The bottom of the first groove (301) has a first positioning rod (303) fixedly connected. The outer side wall of the first slider (302) has a bottom opening (304) that is adapted to the first positioning rod (303).

2. The forming process for an automotive wheel hub bearing flange according to claim 1, characterized in that, The upper mold (102) has a second slide groove (305) on each side. The support rod (300) is fixedly connected to a second slider (306) that slides in the second slide groove (305). The top of the second slide groove (305) is fixedly connected to a second positioning rod (307). The second slider (306) has a top opening (308) that slides in the second positioning rod (307) on one side. The first slider (302) and the second slider (306) are round blocks. The bottom of the second positioning rod (307) and the second slide groove (305) have a preset distance for the second slider (306) to rotate. The top of the first positioning rod (303) and the first slide groove (301) have a preset distance for the first slider (302) to rotate.

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