WO2019076194A1

WO2019076194A1 - Method for manufacturing aluminium alloy automobile hub

Info

Publication number: WO2019076194A1
Application number: PCT/CN2018/108951
Authority: WO
Inventors: 席雨濛
Original assignee: 广东领丰汽车科技实业有限公司
Priority date: 2017-10-17
Filing date: 2018-09-30
Publication date: 2019-04-25
Also published as: CN108890220B; US20200055112A1; CN108890220A; CN108213866A

Abstract

Provided is a method for manufacturing an aluminium alloy automobile hub, the method comprising the following steps: putting a workpiece (1) in the shape of a shallow hat on a first spinning base (3), wherein an opening of the workpiece (1) faces upward, and a first upper pressure head (2) extends into the workpiece (1) from above and then fixes the workpiece (1); and pressing out a rim for spokes on an outer side of a lower portion of the workpiece (1) by means of spinning rollers (5). In the method, 6-series and improved aluminium alloy sheets are taken as raw materials and are integrally formed by multi-pass powerful spinning machining, such that same are deformed step by step in the whole process according to the properties of aluminium alloy, thereby forming a blank of the hub, and then the hub is formed by finishing. The hub, as a whole, is free of weld joints, has high strength, stable quality and light weight, and is applicable to electric buses, trucks, cars, electric cars, etc. The hidden quality problems in casting an aluminium hub are solved, the material stability of the forged aluminium hub is ensured, the investment cost is low, and there is no pollution.

Description

Aluminum alloy automobile wheel hub manufacturing method

Technical field

The invention relates to a manufacturing method in the technical field of wheel hub production, in particular to a method for manufacturing an aluminum alloy automobile wheel hub.

Background technique

At present, the production method of the wheel hub is two kinds of production methods of casting and forging. When casting, quality defects such as slag inclusion and pores, subcutaneous pores, air pockets, air shrinkage holes and pinholes are easily generated, and quality inspection is set for handling these quality defects. The equipment is complex and complex, and its product strength is low, the equipment investment is large, the energy consumption is high, and the environmental pollution is serious. The forging production method uses the ordinary 6061 alloy aluminum rod as the raw material for the forging billet, although the strength of the product is increased. However, there are still problems of easy deformation and gas leakage, and the manufacturing cost is high, which is not conducive to promotion. In addition, in the above two production modes, casting spinning (ie casting + spinning) and forging (ie, forging + spinning) are extended, but the existing technical defects have not been fundamentally solved. We propose a method for manufacturing an aluminum alloy automobile hub to solve the above problems.

Summary of the invention

The object of the present invention is to provide a method for manufacturing an aluminum alloy automobile wheel hub, which can reduce the production difficulty of the aluminum wheel hub and also reduce the production cost.

The solution to solve the technical problem of the present invention is: a method for manufacturing an aluminum alloy automobile wheel hub, comprising the following steps,

1) Place the workpiece in the shape of a shallow hat on the first spinning base, the opening of the workpiece is upward, and the first upper pressing head extends from the upper into the inside of the workpiece to fix the workpiece;

2) Press the rim of the spoke on the outside of the lower part of the workpiece by the rotary wheel.

As a further improvement of the above technical solution, after the step 2), the opening of the workpiece is downward, the workpiece is sleeved on the second spinning base, and the second upper pressing head fixes the workpiece on the second spinning base through the rotation. The wheel thins the side wall of the workpiece and finally spins out the hub blank.

As a further improvement of the above technical solution, the heat treatment and repair processing of the hub blank includes the following steps,

a) T6 solution aging treatment, solution temperature 530-540 ° C, time 150-180 min; put in a cold water tank within 25 s, and stir cold water until the temperature of the hub blank drops to water temperature, aging treatment, the hub blank In the aging furnace, the aging temperature is 150-170 ° C, the aging time is 12-15 h, and then slowly cooled to room temperature with the furnace;

b) After the solution and aging treatment of the hub blank, slight deformation will occur, and the special tools will be used to shape and repair the hub blank to meet the requirements for the machining of the hub.

As a further improvement of the above technical solution, the plasticized and repaired hub blank is machined by a lathe and a machining center to finally generate a hub.

As a further improvement of the above technical solution, before step 1), an aluminum alloy circular plate of a corresponding thickness and diameter is selected; a punching hole is positioned on the aluminum alloy circular plate, and the aluminum alloy circular plate is spun into a shallow hat shape by strong spinning. The artifact.

As a further improvement of the above technical solution, a positioning cavity and a positioning pin located in a middle portion of the positioning cavity are disposed in a middle portion of the first spinning base, and a ring forming curved surface is disposed on an upper portion of the sidewall of the positioning cavity, and the forming curved surface is formed. Located on the outside of the side wall of the positioning chamber.

The invention has the beneficial effects that the invention is based on the 6-series and the improved aluminum alloy sheet material, and is integrally formed by splitting and strong spinning and cold working, the whole hub has no weld seam, high strength, stable quality and light weight, and is suitable for use. In electric buses, trucks, electric cars, etc., the quality hazard of cast aluminum wheels is solved, the material stability of forged aluminum wheels is guaranteed, and the investment cost is low and pollution-free, as follows:

1. The investment amount is small. Since the main processing equipment is standard equipment such as spinning machine and lathe, there is no equipment for heavy industry, and the investment is low;

2, no pollution, because the production process is mainly for rotary cold processing, to eliminate the furnace used in casting and the heating furnace used in forging, which reduces energy consumption and no pollution;

3. Simplified the production process, and it is easier to realize the high automation of the production line, which makes the manufacture of the wheel hub from heavy industry and high difficulty to low light industry. The direct effect is to greatly reduce the cost of the wheel hub;

4. There are very few edge materials produced in production, which saves energy and reduces consumption.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is apparent that the described drawings are only a part of the embodiments of the present invention, and not all of the embodiments, and those skilled in the art can obtain other designs and drawings according to the drawings without any creative work.

Figure 1 is a schematic view of the mechanism of the workpiece in the present invention;

Figure 2 is a schematic view showing the structure of the rim of the spoke in the present invention;

Figure 3 is a schematic view of a workpiece having a rim in the present invention;

Figure 4 is a schematic structural view of a hub blank of the present invention;

Figure 5 is a plan view of the hub of the present invention;

Figure 6 is a side view of the hub of the present invention.

Detailed ways

The concept, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings in order to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The scope of protection of the present invention. In addition, all the coupling/joining relationships mentioned in the text are not directly connected to the components, but rather may constitute a better coupling structure by adding or reducing the coupling accessories according to the specific implementation.

1 to 6, a method for manufacturing an aluminum alloy automobile hub includes the following steps:

1) The workpiece 1 in the shape of a shallow hat is placed on the first spinning base 3, the opening of the workpiece 1 is upward, and the first upper pressing head 2 is inserted into the interior of the workpiece 1 to fix the workpiece 1, and the first upper pressing head is also a The mold, belonging to the inner mold, is fixed in the shape of the inner spoke portion of the workpiece;

2) The rim of the spoke is pressed out of the lower portion of the workpiece 1 by the rotary wheel 5.

In the production process, the material outside the workpiece 1 is pressed by the rotary wheel 5 so that after the material descends, the rim 6 of the spoke is formed under the interaction of the first spinning base 3 and the rotary wheel 5.

Further as a preferred embodiment, after step 2), the opening of the workpiece 1 is downward, the workpiece 1 is sleeved on the second spinning base, and the second upper pressing head fixes the workpiece 1 on the second spinning base. The side wall of the workpiece 1 is thinned by the rotary wheel 5, and finally the hub blank is spun out. At this time, the strong spinning, strong spinning is generally divided into cold spinning and hot spinning. In this process, both cold selection and hot spinning can be practical. The second spinning base is a rim forming mold, also called an inner mold. The rotating wheel is a side wall or a rim which is pressed against the workpiece, and is formed by the inner mold.

Further as a preferred embodiment, the hub blank is subjected to heat treatment and repair treatment, including the following steps,

Further as a preferred embodiment, the plasticized and repaired hub blank is machined by a lathe and a machining center to finally form a hub.

Further, as a preferred embodiment, before step 1), an aluminum alloy circular plate of a corresponding thickness and diameter is selected; a punching hole is positioned on the aluminum alloy circular plate, and the aluminum alloy circular plate is spun into a shallow hat shape using strong spinning. Workpiece 1. After the spinning is completed, the opening of the workpiece 1 in the shape of a shallow hat is buckled down on the mold.

Further, as a preferred embodiment, a positioning cavity and a positioning pin located in the middle of the positioning cavity are disposed in a middle portion of the first spinning base 3, and a ring forming curved surface 4 is disposed on an upper portion of the sidewall of the positioning cavity, the forming arc The face 4 is located outside the side wall of the positioning chamber. In the production process, the material outside the workpiece 1 is pressed by the rotary wheel 5 so that after the material is descended, the rim 6 of the spoke is formed under the interaction of the forming curved surface 4 and the rotary wheel 5.

The following is a preferred embodiment of the invention:

Step 1: Select raw materials, and according to the specifications of the manufactured hub, determine the aluminum alloy circular plate with corresponding thickness and diameter, and the aluminum alloy circular plate uses 6 series and improved aluminum alloy plate;

Step 2: positioning the punching hole, and positioning the punching hole of the aluminum alloy circular plate in the first step through the punching machine to determine the center point of the spinning;

Step 3: First rotation: According to the specification and shape of the hub to be produced, the spinning mold is prepared, and the aluminum alloy circular plate is firstly rotated into a shallow hat-shaped workpiece 1 by strong spinning to form the shape as shown in FIG. 1;

Step 4: Reverse rotation: Open the outer mold, and insert the opening of the workpiece 1 in the shape of a shallow hat into the spinning machine. When spinning, press the first upper pressing head 2 against the workpiece 1. The rotating wheel 5 is rotated from top to bottom. Pressing the workpiece 1, as shown in Fig. 2, after the reverse rotation, the aluminum material of the workpiece 1 is spun to the rim 6 of the spoke, forming a shape as shown in Fig. 3;

Step 5: Fine rotation: After the opening of the workpiece 1 is downward, the workpiece 1 is placed on the second spinning base, and the second upper pressing head fixes the workpiece 1 on the second spinning base, and the strong spinning is used to pass the mold. The outer wall of the workpiece 1 is thinned and shaped to form a hub blank of the shape of FIG. 4;

The reason for the third to fifth spins is that the thickness of the aluminum plate is large, and the amount of spin deformation is limited. In particular, the reverse rotation is required to thicken the workpiece 1 while thickening the material to the rim of the spokes 6 Then, the workpiece 1 is subjected to spin forming, and the whole process is gradually deformed according to the performance of the aluminum alloy, and finally the hub blank is formed, and the precision of the spinning equipment and the mold is higher, the closer the hub blank is to the finished product, the processing allowance is reduced, and the cost is lower. ;

Step 6: solution aging treatment, after the hub blank in step 5 is subjected to spin forming, T6 solid solution aging treatment is required, the solution temperature is 530-540 ° C, the time is 150-180 min; and the cold water tank is placed in 25 s. Medium and stir the cold water until the temperature of the hub blank drops to the water temperature;

After the aging treatment, the hub blank is placed in the aging furnace, the aging temperature is 150-170 ° C, the aging time is 12-15 h, and then slowly cooled to room temperature with the furnace;

Step 7: Repair, after the solidification and aging of the hub blank, slight deformation will occur, and the special tools will be used to shape and repair the hub blank to meet the requirements of the next machining of the hub;

Step 8: Machining, using a professional fixture, machining the wheeled blank after the plastic repair with a lathe and machining center, and finally generating the wheel products of Figures 5 and 6.

The above is a detailed description of the preferred embodiments of the present invention, but the invention is not limited to the embodiments, and various modifications and substitutions can be made by those skilled in the art without departing from the spirit of the invention. Such equivalent modifications or alternatives are intended to be included within the scope of the claims.

Claims

A method for manufacturing an aluminum alloy automobile wheel hub, comprising: the following steps,

1) Place the workpiece in the shape of a shallow hat on the first spinning base, the opening of the workpiece is upward, and the first upper pressing head extends from the upper into the inside of the workpiece to fix the workpiece;

2) Press the rim of the spoke on the outside of the lower part of the workpiece by the rotary wheel.
The manufacturing method of the aluminum alloy automobile hub according to claim 1, wherein after the step 2), the opening of the workpiece is downward, the workpiece is sleeved on the second spinning base, and the second upper pressing head is used for the workpiece. It is fixed on the second spinning base, and the side wall of the workpiece is thinned by the rotating wheel, and finally the hub blank is spun out.
The method for manufacturing an aluminum alloy automobile hub according to claim 2, wherein the heat treatment and repair processing of the hub blank comprises the following steps:

a) T6 solution aging treatment, solution temperature 530-540 ° C, time 150-180 min; put in a cold water tank within 25 s, and stir cold water until the temperature of the hub blank drops to water temperature, aging treatment, the hub blank In the aging furnace, the aging temperature is 150-170 ° C, the aging time is 12-15 h, and then slowly cooled to room temperature with the furnace;

b) After the solution and aging treatment of the hub blank, slight deformation will occur, and the special tools will be used to shape and repair the hub blank to meet the requirements for the machining of the hub.
The method for manufacturing an aluminum alloy automobile hub according to claim 3, wherein the wheeled blank after the shaping and repairing is machined by a lathe and a machining center to finally form a hub.
The method for manufacturing an aluminum alloy automobile hub according to any one of claims 1 to 4, characterized in that before step 1), an aluminum alloy circular plate of a corresponding thickness and diameter is selected; and the punching is positioned on the aluminum alloy circular plate The aluminum alloy circular plate is spun into a shallow hat-shaped workpiece by strong spinning.
The manufacturing method of the aluminum alloy automobile hub according to any one of claims 1 to 4, wherein a positioning cavity and a positioning pin located in a middle portion of the positioning cavity are arranged in a middle portion of the first spinning base, and the positioning cavity The upper portion of the side wall is provided with a ring forming curved surface which is located outside the side wall of the positioning chamber.