A design method for automated precision forging dies for automobile wheel hub bearings

Abstract

The present invention relates to the technical field of automotive wheel hub bearing forging, and specifically to a method for designing a die for automated precision forging of automotive wheel hub bearings. The die comprises an upper die and a lower die, which are used to form wheel hub bearing forgings with flash and punched skin. The present invention proposes a method for calculating the adhesion force generated between the upper and lower die sidewalls and the forging, thereby optimizing the position of the parting surface and the size of the punched skin, and also modifies the draft angle design of the upper and lower dies. Through such optimization and modification, a relatively small adhesion force between the forging and the upper die is achieved, thereby preventing wheel hub bearing forgings from sticking to the upper die in automated forging production lines.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wheel hub bearing forging, in particular to a design method for an automated automobile wheel hub bearing precision forging die. Background Art

[0002] The forging industry, a vital component of my country's manufacturing industry, is currently facing challenges such as harsh production environments, high risks, high labor intensity, and surging labor costs. Using robots to replace workers in high-temperature environments to grasp and flip forgings and achieve automated forging is an important path to addressing these issues. However, due to the lack of intelligence in robots, forging robots cannot handle various issues on the production line as flexibly as humans. The most typical example is when a forging sticks to the upper die. The robot cannot knock the forging off and then grasp it like a human, so the automated production line has to be stopped in an emergency and resumed after manual processing. If the die sticks frequently, not only will the production line efficiency decrease, but it will also increase die wear and reduce die life. Therefore, how to prevent forgings from sticking to the upper die in automated forging production lines is the key to further improving production line efficiency.

[0003] The adhesion between forgings and dies is mainly due to the uneven distribution of lubricant on the die, which causes a large temperature rise in local areas due to friction and thus adhesion. Due to cost constraints, only two nozzles are generally installed in the production line, one installed in the upper die to spray the lower die cavity, and the other installed in the lower die to spray the upper die cavity. At this time, due to the deep die cavity of the wheel hub forging, it is difficult to completely cover the side wall of the die and it is difficult for the lubricant to adhere to it due to the influence of gravity. Therefore, the side wall is prone to adhesion. Once the adhesion between the upper die side wall and the forging is greater than the adhesion between the lower die side wall plus the weight of the forging, the forging will inevitably stick to the upper die. Summary of the Invention

[0004] To solve the above problems, the present invention provides a design method for an automated automobile wheel hub bearing precision forging die, which can prevent forgings from sticking to the die, thereby improving the efficiency of the automated production line.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A method for designing a die for automated precision forging of automobile wheel hub bearings, comprising a punching die, an upper die, a forging, and a lower die. The upper die and the lower die are used to form a wheel hub bearing forging with flash and a punching die. The method comprises the following steps:

[0007] Step 1: Design the forging parting surface and punching skin according to the forging design manual. The principle of selecting the parting surface recorded in the forging technical manual is to select the position with the largest horizontal projection size and set it in the middle of the side of the forging. The punching skin depth is that the contact height H6 between the upper die and the forging at the inner hole is equal to the inner hole diameter D1, and the punching skin thickness T is 0.5D1;

[0008] Step 2: Perform finite element forming simulation on the designed forging to obtain the normal stress on all side walls of the forging, and select 5-10 points from top to bottom on each side wall to calculate the average normal stress on each side wall. , then the normal load on each side wall is

[0009]

[0010] Where F is the normal load on the side wall, d is the side wall diameter, and h is the side wall height.

[0011] Since the solid surface is uneven at the microscopic level, the adhesion area is not the nominal contact area observed at the macroscopic level. The adhesion area is generally estimated by the normal load and the yield strength of the material.

[0012]

[0013] Where F is the normal load on the contact surface, is the yield strength of the material, k is the contact coefficient, and its value range is 1×10 -5 ~5×10 -5 .

[0014] The adhesion between the die side wall and the forging is

[0015]

[0016] in For adhesion, is the shear strength of the adhesion point, is the adhesion area.

[0017] The adhesion force of the upper mold side wall can be calculated as

[0018]

[0019] in For the upper mold adhesion, The adhesion force of the side wall H4 of the upper mold parting surface is The H6 adhesion of the punching side wall of the upper die is It is the adhesion of the remaining side walls except the upper mold parting side wall and the punching side wall.

[0020] The adhesion force of the lower mold side wall can be calculated as

[0021]

[0022] in For the lower mold adhesion, The adhesion of the lower mold parting side wall H5, The adhesion of the lower die punching side wall H7, To increase the adhesion of the remaining side walls except the lower mold parting side wall and the punching side wall,

[0023] If the adhesion of the upper and lower mold side walls meets

[0024]

[0025] Then there will be no sticking to the mold, is the safety factor, ranging from 1.2 to 2.5, and G is the weight of the forging;

[0026] Step 3: Constrain the position of the parting surface of the wheel hub forging;

[0027] Step 4: Constrain the punching and skin size design;

[0028] Step 5: If the adhesion of the upper and lower mold side walls is not satisfied , it is necessary to optimize the parting surface and punching size of the wheel hub forging. The contact height H6 between the upper die and the forging at the inner hole and the height H4 between the upper die and the forging at the parting surface are substituted as unknown solution parameters to obtain the upper die side wall adhesion. , the contact height H7 between the lower die and the forging at the inner hole and the height H5 between the lower die and the forging at the parting surface are substituted as unknown solution parameters to obtain the adhesion force of the lower die side wall. ,Will and Substitution , we can get The inequality relationship ,in Indicates about function.

[0029] Step 6: Substitute the newly designed forging parting surface and punching skin into the finite element simulation and proceed to step 2 to check the adhesion. If it meets the requirements, the design is the final design size.

[0030] Step 7: Determine the draft angle of the upper die part and the draft angle of the lower die part of the forging, and then the wheel hub bearing forging die structure will be drawn according to the optimized parting surface position, punching skin size and draft angle.

[0031] Furthermore, the upper mold parting surface height H4 in step 2 is

[0032]

[0033] in The fillet of point A, the height of the straight edge The value range is 0.5~2mm.

[0034] The height of the lower mold parting surface H5 is

[0035] Where H3 is the spoke height of the forging.

[0036] Furthermore, the punching thickness T in step 1 and the contact height H7 between the lower die and the forging in the inner hole in step 2 must meet

[0037]

[0038] The thickness coefficient The value range is 1 to 2, D1 is the inner hole diameter, and H2 is the inner hole height.

[0039] The contact height between the upper die and the forging at the inner hole is H6.

[0040]

[0041] Then optimize the position of the parting surface of the wheel hub forging and the punching size, and select the values of H4, H6, H5 and H7 to satisfy the inequality

[0042] Furthermore, if the adhesion force described in step 6 does not satisfy the inequality Then according to the formula and With the inequality obtained before , re-evaluate H4, H6, H5 and H7, and then substitute the newly designed forging into the finite element simulation, and then perform step 2 again to check the adhesion, and repeat this process until the adhesion check in step 2 is satisfied.

[0043] Furthermore, in order to make it easier to separate the forging from the upper die, the draft angle of the upper die in step 7 is set to 5-7 degrees, and the draft angle of the lower die is set to 0.5-2 degrees.

[0044] Furthermore, the inner hole height H2 of the forging accounts for 85%-95% of the entire forging height H1, and the inner hole height-to-diameter ratio H2:D1 reaches 2.5:1 to 3:1.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] This paper proposes a method for calculating the adhesion between the upper and lower die sidewalls and the forging, optimizing the parting plane position and punching hole dimensions. It also modifies the draft angle design of the upper and lower dies. This optimization and modification minimizes adhesion between the forging and the upper die, preventing wheel hub bearing forgings from sticking to the upper die in automated forging production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the basic shape of a wheel hub bearing forging without punching and skinning in Example 1;

[0048] Figure 2 This is a schematic diagram of the basic shape of a wheel hub bearing forging with punching and skin designed according to the forging manual in Example 1;

[0049] Figure 3 for Figure 2 Normal stress distribution diagram of the side wall of the wheel hub bearing forging in finite element simulation;

[0050] Figure 4 This is the normal stress distribution diagram of the side wall of the optimized wheel hub bearing forging by finite element simulation;

[0051] Figure 5 This is a schematic diagram of the wheel hub bearing forging die after optimization in Example 1;

[0052] Figure 6 This is a physical picture of the wheel hub bearing forging in Example 1.

[0053] In the figure: punching sheet 1; upper die 2; forging 3; lower die 4. DETAILED DESCRIPTION

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0055] like Figure 1 As shown, a certain type of automobile wheel hub bearing forging has an outer diameter D2 of 140 mm, an inner hole diameter D1 of 25 mm, D3 is the inner wall diameter of the outer hole of forging 3, D4 is the outer wall diameter of the outer hole of forging 3, D5 is the outer wall diameter of the bottom of forging 3, D6 is the outer wall diameter of the lower side of the split part of the lower die 4, the height H1 of forging 3 is 76 mm, the inner hole height H2 of forging 3 is 65 mm, the spoke height H3 of forging 3 is 14 mm, H4 is the side wall height of the split surface of the upper die (2), H5 is the side wall height of the split surface of the lower die (4), H6 is the contact height between the upper die (2) and the inner hole of forging (3), H7 is the punching side wall height of the lower die (4), H8 is the upper part height of the lower side of the spoke of forging 3, H9 is the lower part height of the lower side of the spoke of forging 3, H10 is the upper part height of the upper side of the spoke of forging 3, and H11 is the lower part height of the upper side of the spoke of forging 3.

[0056] The automobile wheel hub bearing forging die design method comprises the following steps:

[0057] Step 1: According to the forging design manual, design the forging 3-parting surface and punching skin 1. Figure 2 The basic shape diagram of the wheel hub bearing forging 3 with a punched skin 1 is shown in FIG. The principle for selecting the parting surface S is to select the position with the largest horizontal projection size and to be located in the middle of the side of the forging 3. Therefore, H4=H5=0.5*H3=7mm. The depth and thickness of the punched skin 1 are designed to be the contact height H6 between the upper die 2 and the forging 3 at the inner hole equal to the inner hole diameter D1, so H6 is 25mm. The skin thickness T is 0.5D1, so T is 12.5mm. H7 can be calculated as 27.5mm based on H2-H6-T. Figure 2 The other side wall heights and diameters are: D3 is 56mm, D4 is 69mm, D5 is 44mm, D6 is 62mm, H11 is 15mm, H10 is 11mm, H8 is 7mm, and H9 is 40mm.

[0058] Step 2: Perform finite element forming simulation on the designed forging 3 to obtain the normal stress on all side walls of the forging 3, such as Figure 3 As shown, according to the normal stress distribution diagram on the side wall, 5 points are selected from top to bottom on each side wall to calculate the average normal stress on each side wall. The average stress value of the H6 side wall is 649MPa, the average stress value of the H10 side wall is 434MPa, the average stress value of the H11 side wall is 504MPa, the average stress value of the H4 side wall is 462MPa, the average stress value of the H5 side wall is 476MPa, the average stress value of the H8 side wall is 584MPa, the average stress value of the H9 side wall is 161MPa, and the average stress value of the H7 side wall is 288MPa. According to the formula:

[0059]

[0060]

[0061]

[0062] where k is 2×10 -5 , steel at high temperature Take 100MPa, steel at high temperature Take 58MPa and calculate the adhesion force of the upper mold 2 parting surface side wall H4 0.017kN, upper die 2 punching side wall H6 adhesion 0.015kN, except for the side wall of the upper mold 2-part mold and the punching side wall, the remaining side wall adhesion The adhesion strength of the lower mold 4-part mold side wall H5 is 0.029kN is 0.017kN, The adhesion force of the punching side wall H7 of the lower die 4 is 0.007kN. The adhesion of the remaining side walls except the 4-part mold side wall and the punching side wall is 0.020kN. At this time, the adhesion of the upper mold 2 side wall is According to the formula The calculated value is 0.061kN, and the adhesion force of the side wall of the lower die 4 is According to the formula

[0063]

[0064] Calculated to be 0.044kN, according to the formula

[0065]

[0066] Check, the safety factor Take 1.5, the weight of forging 3 is 0.03kN, at this time the adhesion force of the upper die 2 and lower die 4 side walls does not meet the verification formula

[0067]

[0068] Needs to be optimized.

[0069] Substituting the contact height H6 between the upper die 2 and the forging 3 at the inner hole and the height H4 between the upper die 2 and the forging 3 at the parting surface as unknown solution parameters, the adhesion force of the side wall of the upper die 2 can be obtained. , the contact height H7 between the lower die 4 and the forging 3 at the inner hole and the height H5 between the lower die 4 and the forging 3 at the parting surface are substituted as unknown solution parameters to obtain the adhesion force of the side wall of the lower die 4 ,Will and Substitution In the formula, we can get the formula Inequality

[0070]

[0071] Step 3: Constrain the position of the 3-parting surface of the wheel hub forging. Due to the need for robot clamping, H4 must be greater than 0. Since point A has a fillet, H4 must be greater than its fillet. Considering the mold error problem, a straight edge must be left below the fillet. The range of H4 is ,according to Take point A and fillet it 2mm, straight edge height is 1mm, then the formula The obtained H4 value range is , the height H5 of the lower die 4 parting surface can be calculated according to the formula Obtain.

[0072] Step 4, constrain the size design of the punching skin 1. Since the thickness T of the punching skin 1 is too large, it is easy for the punch to bend, and the height H7 between the lower die 4 and the forging 3 at the parting surface is too large, which will hinder the filling of the lower part of the forging 3. Therefore, the formula must be satisfied. , the thickness coefficient Take it as 1.4, then according to the formula The obtained thickness T of the skin and the height H7 of the lower die 4 and the forging 3 at the parting surface are in the range of

[0073]

[0074] The contact height H6 between the upper die 2 and the forging 3 in the inner hole can be calculated according to the formula Obtain.

[0075] Step 5: Optimize the position of the 3-parting surface of the wheel hub forging and the size of the punching hole 1, according to the formula 、 、 and , take the values of H4, H6, H5 and H7, H4 is 4mm, H5 is 10mm, H6 is 15mm, H7 is 22mm, and substitute the calculated formula , and it is found that the inequality is satisfied.

[0076] Step 6: Based on the newly designed parting surface of forging 3 and punching skin 1, step 2 is performed again. First, the newly designed forging 3 is subjected to finite element forming simulation to obtain the normal stress on all side walls of forging 3, such as Figure 4 As shown, according to the normal stress distribution diagram on the side wall, 5 points are selected from top to bottom on each side wall to calculate the average normal stress on each side wall. The average stress value of the H6 side wall is 674MPa, the average stress value of the H10 side wall is 447MPa, the average stress value of the H11 side wall is 569MPa, the average stress value of the H4 side wall is 386MPa, the average stress value of the H5 side wall is 797MPa, the average stress value of the H8 side wall is 639MPa, the average stress value of the H9 side wall is 211MPa, and the average stress value of the H7 side wall is 171MPa. According to the formula

[0077]

[0078]

[0079]

[0080] , calculate the adhesion of the upper mold 2 parting surface side wall H4 0.008kN, upper die 2 punching side wall H6 adhesion The adhesion strength of the remaining side walls is 0.009kN, except for the upper die 2-part die side wall and the punching side wall. The adhesion strength of the lower mold 4-part mold side wall H5 is 0.032kN is 0.041kN, The adhesion force of the punching side wall H7 of the lower die 4 is 0.003kN. The adhesion of the remaining side walls except the 4-part mold side wall and the punching side wall is 0.024kN. At this time, the adhesion of the upper mold 2 side wall is According to the formula The calculated value is 0.049kN, and the adhesion force of the side wall of the lower die 4 is According to the formula

[0081]

[0082] Calculated to be 0.068kN, according to the formula

[0083]

[0084] Check, the safety factor Take 1.5, the weight of forging 3 is 0.03kN, at this time the adhesion force of the side walls of upper die 2 and lower die 4 meets the verification formula.

[0085] Step 7: Determine the draft angle of the upper die 2 and the lower die 4 of the forging 3. Since the wheel hub forging is a precision die forging, the draft angle is required to be as small as possible to reduce machining allowance. The draft angle will have a certain impact on the demoulding of the forging. Generally, the larger the draft angle, the smaller the required demoulding force, and the easier it is to demould. In order to make it easier for the forging to separate from the upper die, the draft angle of the upper die 2 is 5°, and the draft angle of the lower die 4 is 1°. Based on the optimized parting surface position, punching skin 1 size and draft angle, draw the precision wheel hub bearing forging 3 die drawing, as shown in the figure. Figure 5 As shown, the final forged forging 3 is shown in the figure Figure 6 shown.

[0086] Furthermore, the inner hole height H2 of the forging 3 accounts for 85%-95% of the entire forging 3 height H1, and the inner hole height-to-diameter ratio reaches H2:D1 of 2.5:1 to 3:1. If the design in the forging technology manual is adopted, the ratio of the inner hole contact height H6 between the upper die 2 and the forging 3 and the inner hole contact height H7 between the lower die 4 and the forging 3 is 1:1 to 1:1.5, and the ratio of the height H4 between the upper die 2 and the forging 3 at the parting surface and the height H5 between the lower die 4 and the forging 3 at the parting surface is 1:1. Under this design, since the contact surface between the side wall of the upper die 2 and the forging 3 is large, once the local temperature rise of the mold is too high, the total adhesion force generated in the adhesion area of the upper die 2 is very large, causing the forging 3 to adhere to the upper die 2, affecting the efficiency of the automated production line. Therefore, the inner hole height H2 of the forging 3 is set to 85%-95% of the entire forging 3 height H1, and the inner hole height-to-diameter ratio reaches H2:D1 of 2.5:1 to 3:1, which can reduce the total adhesion force generated in the adhesion area of the upper die 2 and thus improve the efficiency of the automated production line.

[0087] The above is a detailed introduction to the design method of a precision forging die for automated automotive wheel hub bearings provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A design method for automated automobile wheel hub bearing precision forging die, characterized by: The die comprises an upper die (2) and a lower die (4), wherein the upper die (2) is connected to the lower die (4), a forging (3) is provided between the upper die (2) and the lower die (4), a punched skin (1) is formed in the forging (3), and the forging (3) is a wheel hub bearing forging with a flash and a punched skin (1). The method comprises the following steps: Step 1: Design the parting surface and punching skin (1) of the forging (3) in accordance with the forging design manual. The principle of selecting the parting surface recorded in the forging technology manual is to select the position with the largest horizontal projection size and set it in the middle of the side of the forging (3). The depth of the punching skin (1) is the contact height between the upper die (2) and the inner hole of the forging (3). H6 is the contact height between the upper die (2) and the inner hole of the forging (3). H6 is equal to the inner hole diameter D1 of the forging (3). The thickness T of the punching skin (1) is 0.5D1. Step 2: Perform finite element forming simulation on the designed forging (3) to obtain the normal stress on all side walls of the forging (3). Select 5-10 points from top to bottom on each side wall and calculate the average normal stress σ on each side wall. The normal load on each side wall is: F=σ*π*d*h Where F is the normal load on the side wall, d is the diameter of the side wall, and h is the height of the side wall; Since the solid surface is uneven at the microscopic level, the adhesion area is not the nominal contact area observed at the macroscopic level. The adhesion area is generally estimated by the normal load and the yield strength of the material. Among them A d is the adhesion area, F is the normal load on the contact surface, σ s is the yield strength of the material, k is the contact coefficient, and its value range is 1×10 -5 ~5×10 -5 , the adhesion between the die side wall and the forging is F Adh =s Shear *A d Among them F Adh is the adhesion force, σ Shear is the shear strength of the adhesion point, A d is the adhesion area; The adhesion force of the upper mold (2) side wall is calculated as F TAdh =F TPartAdh +F THoleAdh +F TOtherAdh Among them F TAdh is the adhesion force of the upper mold (2), F TPartAdh F is the adhesion force of the side wall of the parting surface of the upper mold (2), THoleAdh F is the adhesion force of the punching side wall of the upper die (2), TOtherAdh is the adhesion force of the remaining side walls except the parting side walls and the punching side walls of the upper mold (2), and H4 is the height of the side walls of the parting surface of the upper mold (2); The adhesion force of the side wall of the lower mold (4) is calculated as F BAdh =F BPartAdh +F BHoleAdh +F BOtherAdh Among them F BAdh is the adhesion force of the lower mold (4), F BPartAdh F is the adhesion force of the side wall of the lower mold (4), BHoleAdh F is the adhesion force of the punching side wall of the lower die (4), BOtherAdh The adhesion force of the remaining side walls except the split side wall and the punching side wall of the lower mold (4), H5 is the height of the split side wall of the lower mold (4), and H7 is the height of the punching side wall of the lower mold (4); If the adhesion of the upper and lower mold side walls meets d*F TAdh <F BAdh +G Then sticking to the die (2) will not occur, where δ is the safety factor, ranging from 1.2 to 2.5, and G is the weight of the forging (3); Step 3: constraining the position of the parting surface of the hub forging (3); Step 4: Constrain punching and skin (1) size design; Step 5: If the adhesion of the upper and lower mold side walls does not meet δ*F TAdh <F BAdh +G, it is necessary to optimize the size of the parting surface of the hub forging (3) and the punching skin (1). Substituting the inner hole contact height H6 between the upper die (2) and the forging (3) and the side wall height H4 of the parting surface of the upper die (2) as unknown solution parameters, the side wall adhesion force F of the upper die (2) can be obtained. TAdh Substituting the lower die (4) punching side wall height H7 and the lower die (4) parting side wall height H5 as unknown solution parameters, the lower die (4) side wall adhesion force F BAdh , F TAdh and F BAdh Substitute into the formula δ*F TAdh <F BAdh +G, the inequality relationship f(H4,H6,H5,H7)<0 among H4,H6,H5 and H7 can be obtained, where f(H4,H6,H5,H7) represents the function of H4,H6,H5 and H7. Then, the position of the parting surface of the wheel hub forging (3) and the size of the punching skin (1) are optimized, and the values of H4,H6,H5 and H7 are selected to satisfy the inequality f(H4,H6,H5,H7)<0. Among them, H4 is the side wall height of the parting surface of the upper die (2), H5 is the side wall height of the parting surface of the lower die (4), H6 is the contact height between the upper die (2) and the inner hole of the forging (3), and H7 is the side wall height of the punching hole of the lower die (4). Step 6: Substitute the newly designed forging (3) parting surface and punched skin (1) into the finite element simulation and proceed to step 2 to check the adhesion. If the adhesion is satisfied, the design is the final design size. Step 7: Determine the draft angle of the upper die (2) and the lower die (4) of the forging (3), and then the wheel hub bearing forging die structure will be drawn according to the optimized parting surface position, punching skin (1) size and draft angle.

2. The method for designing an automated automobile wheel hub bearing precision forging die according to claim 1, characterized in that: The inner hole height H2 of the forging (3) accounts for 85%-95% of the entire forging (3) height H1, and the inner hole height-to-diameter ratio H2:D1 reaches 2.5:1 to 3:1, where H1 is the height of the forging (3) and H2 is the inner hole height of the forging (3).

3. The method for designing an automated automobile wheel hub bearing precision forging die according to claim 1, characterized in that: The height H4 of the side wall of the parting surface of the upper mold (2) in step 2 is H4≥R A +Δh where R A The fillet of point A, the straight edge height Δh ranges from 0.5 to 2 mm; The height H5 of the side wall of the lower mold (4) is H5=H3-H4 Where H3 is the spoke height of the forging (3).

4. The method for designing an automated automobile wheel hub bearing precision forging die according to claim 1, characterized in that: The thickness T of the punched skin (1) in step 1 and the height H7 of the punched side wall of the lower die (4) in step 2 must meet The thickness coefficient γ ranges from 1 to 2, D1 is the inner hole diameter, and H2 is the inner hole height. The contact height H6 between the upper die (2) and the forging (3) at the inner hole is H6=H2-T-H7.

5. The method for designing an automated automobile wheel hub bearing precision forging die according to claim 1, characterized in that: If the adhesion force described in step 6 does not satisfy the inequality f(H4,H6,H5,H7)<0, then according to the formula and H6 = H2 - T - H7 and the previously obtained inequality f(H4, H6, H5, H7) < 0; Re-evaluate H4, H6, H5 and H7, and then substitute the newly designed forging (3) into the finite element simulation, and then perform step 2 again to check the adhesion, and repeat this process until the formula δ*F in step 2 is satisfied. TAdh <F BAdh +G Check of adhesion.

6. The method for designing an automated automobile wheel hub bearing precision forging die according to claim 1, characterized in that: In step 7, the draft angle of the upper mold (2) is set to 5-7°, and the draft angle of the lower mold (4) is set to 0.5-2°.

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