Stamping part size control method

Abstract

This invention discloses a method for controlling the dimensions of stamped parts, belonging to the field of stamping forming technology. The method first performs a free judgment on the stamped part in its free state to correct the size of the main positioning hole. Then, the stamped part is assembled with the vehicle body to determine if there is a deviation in its own dimensions. If there is a deviation, it indicates that there is a deviation in the size of the main positioning surface. Next, the detection dimension chain of the stamped part is broken down according to the detection benchmark, and the dimensions of the stamped part located in the same dimension control direction are collected and formed into a unidirectional dimension chain corresponding to multiple dimension control directions. Using the main positioning surface of the stamped part as a closed loop, the dimensional deviation of the main positioning surface in each dimension control direction is determined, and the size of the main positioning surface is corrected. This method enables more accurate and stable control of the stamped part dimensions.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and more particularly to a method for controlling the dimensions of stamped parts. Background Technology

[0002] In existing technologies, the dimensional control of stamped body parts is generally based on the RPS (Reference Point System) for reference control. First, the A-side position is controlled using the locating surface, then the contour is controlled using the locating holes, and finally, experimental assembly and adjustment are performed on the vehicle body. This multi-dimensional, hybrid dimensional control method requires the theoretically designed stamped part reference to match the actual vehicle body reference to ensure the effectiveness of the assembly and adjustment. However, the actual vehicle body reference cannot be perfectly matched with the theoretically designed stamped part reference, meaning that the actual vehicle body reference is locked within a certain reasonable deviation range. Therefore, during the experimental assembly and adjustment of the stamped part on the vehicle body, deviations in the dimensional control of the stamped part are unavoidable. Affected by these deviations, the dimensional deviation of the stamped part itself will be amplified in one direction or even exceed the reasonable deviation range, making it impossible to stably control the stamped part's dimensions and ultimately affecting the overall vehicle assembly and adjustment dimensions. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the size of stamped parts, which can effectively control the size of stamped parts and improve the dimensional stability of the whole vehicle assembly.

[0004] To achieve the above objectives, the following technical solution is provided:

[0005] The method for controlling the dimensions of stamped parts includes the following steps:

[0006] Obtain the free determination dimension data of the stamped part in its free state;

[0007] Based on the free determination dimension data, the size of the main positioning hole of the stamped part is corrected;

[0008] The stamped part is assembled with the vehicle body, and the stamped part is inspected according to the inspection datum of the vehicle body to obtain the inspection dimension chain of the stamped part; the inspection datum of the vehicle body includes multiple dimension control directions;

[0009] Based on the vehicle body inspection benchmark, the inspection dimension chain is broken down;

[0010] The dimensions of the stamped parts located in the same dimension control direction are collected and formed into a unidirectional dimension chain that corresponds one-to-one with multiple dimension control directions;

[0011] Using the main positioning surface of the stamped part as a closed loop, each of the same-direction dimension chains is deduced in reverse to determine the dimensional deviation of the main positioning surface in each of the dimension control directions;

[0012] The size of the main positioning surface is corrected based on the dimensional deviation of the main positioning surface in multiple dimensional control directions.

[0013] As an alternative method for controlling the dimensions of stamped parts, before breaking down the inspection dimension chain based on the inspection benchmark of the vehicle body, the following steps are also included:

[0014] Based on the free determination dimension data, it is determined whether the stamped part is rotating. If so, the dimensions of the stamped part are corrected to eliminate the rotation.

[0015] As an alternative method for controlling the dimensions of stamped parts, before correcting the dimensions of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions, the following steps are also included:

[0016] Determine whether there is interference on the auxiliary positioning surface of the stamped part; if so, eliminate the interference.

[0017] As an alternative method for controlling the dimensions of stamped parts, a method for correcting the dimensions of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions includes the following steps:

[0018] Based on the magnitude of the dimensional deviation of the main positioning surface in the multiple dimensional control directions, the correction order of the dimensions of the main positioning surface in the multiple dimensional control directions is determined;

[0019] According to the correction order, the dimensions of the main positioning surface in multiple dimension control directions are corrected sequentially.

[0020] As an alternative method for controlling the dimensions of stamped parts, a method for sequentially correcting the dimensions of the main positioning surface in multiple dimension control directions according to the correction order includes the following steps:

[0021] After each correction of the dimension of the main positioning surface in one of the dimension control directions, the stamped part is inspected again according to the inspection benchmark of the vehicle body, and it is determined whether the deviation of the stamped part's own dimension has been completely eliminated. If yes, the process ends; if not, the dimension of the main positioning surface in the next dimension control direction is corrected according to the correction sequence.

[0022] As an optional method for controlling the dimensions of stamped parts, the multiple dimensions control directions include the front-to-back direction of the vehicle body, the left-to-right direction of the vehicle body, and the up-to-down direction of the vehicle body.

[0023] As an alternative method for controlling the dimensions of stamped parts, a method for correcting the dimensions of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions includes the following steps:

[0024] If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from back to front along the front-rear direction of the vehicle body.

[0025] If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from front to back along the front-rear direction of the vehicle body.

[0026] If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from right to left along the left-right direction of the vehicle body.

[0027] If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from left to right along the left-right direction of the vehicle body.

[0028] If the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is from top to bottom along the vertical direction of the vehicle body.

[0029] If the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is from bottom to top along the vertical direction of the vehicle body.

[0030] As an optional solution for the method of controlling the size of stamped parts, after correcting the size of the main positioning hole of the stamped part based on the freely determined size data, the following steps are also included:

[0031] Obtain the displacement of the auxiliary positioning hole of the stamped part;

[0032] Determine whether the displacement of the auxiliary positioning hole of the stamped part is less than the preset displacement. If not, correct the size of the auxiliary positioning hole of the stamped part.

[0033] As an optional method for controlling the size of stamped parts, the preset displacement is 0.2mm-0.3mm.

[0034] As an optional method for controlling the dimensions of stamped parts, in obtaining the free determination dimension data of the stamped parts in a free state, a coordinate measuring machine is used to measure the stamped parts to obtain the free determination dimension data.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] The stamping part size control method of the present invention first performs a free judgment on the stamping part in a free state to determine whether there is a deviation in the size of the main positioning hole of the stamping part. When a deviation in the size of the main positioning hole of the stamping part is found, the size of the main positioning hole is corrected so that the size of the main positioning hole meets the requirements. Then, the stamping part is assembled with the vehicle body to determine whether there is a deviation in the size of the stamping part itself. If there is a deviation in the size of the stamping part itself, it indicates that there is a deviation in the size of the main positioning surface of the stamping part. Then, the detection size chain of the stamping part is broken down according to the detection benchmark, and the size of the stamping part itself located in the same size control direction is collected and combined. A series of unidirectional dimension chains are formed, each corresponding to a specific dimension control direction. Then, using the main positioning surface of the stamped part as a closed loop, each unidirectional dimension chain is derived to determine the dimensional deviation of the main positioning surface in each dimension control direction. The dimensional deviation of the main positioning surface in each dimension control direction is the dimensional deviation of the stamped part itself in each dimension control direction. Finally, based on the dimensional deviation of the main positioning surface in multiple dimension control directions, the dimension of the main positioning surface is corrected, thereby achieving the purpose of correcting the dimension of the stamped part. Compared with existing technologies, this method can control the dimension of the stamped part more accurately and stably, and improve the dimensional stability of the entire vehicle assembly. Attached Figure Description

[0037] Figure 1 This is a flowchart of the stamping part size control method in an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0045] like Figure 1 As shown, this embodiment provides a method for controlling the dimensions of stamped parts, including the following steps:

[0046] S1. Obtain the free determination dimension data of the stamped part in the free state;

[0047] In this embodiment, a coordinate measuring machine (CMM) is used to measure the stamped part to obtain its free-determination dimensional data in a free state. It should be noted that the specific method for measuring the stamped part using a CMM and obtaining its free-determination dimensional data in a free state is existing technology and will not be described further here.

[0048] S2. Based on the freely determined dimension data, correct the size of the main positioning hole of the stamping part;

[0049] It should be noted that by measuring the stamped part with an existing coordinate measuring machine, a free judgment report of the stamped part can be obtained. This free judgment report contains the dimensional data and data analysis results of the main positioning hole of the stamped part. Based on the dimensional data and data analysis results, it can be determined whether there is a deviation in the size of the main positioning hole of the stamped part. When it is determined that there is a deviation in the size of the main positioning hole of the stamped part, the size of the main positioning hole of the stamped part is corrected so that the size of the main positioning hole meets the requirements.

[0050] After the dimensions of the main positioning hole are corrected, the auxiliary positioning hole of the stamping part may be displaced. If the displacement of the auxiliary positioning hole is too large, it will also affect the dimensions of the stamping part itself. Therefore, it is necessary to determine the displacement of the auxiliary positioning hole.

[0051] Furthermore, following step S2, the following steps are also included:

[0052] Obtain the displacement of the auxiliary positioning hole of the stamped part;

[0053] Determine whether the displacement of the auxiliary positioning hole of the stamped part is less than the preset displacement. If not, adjust the size of the auxiliary positioning hole of the stamped part.

[0054] Optionally, the preset displacement is 0.2mm-0.3mm. For example, the preset displacement can be any value between 0.2mm and 0.3mm, such as 0.2mm, 0.25mm, 0.3mm, etc.

[0055] It should be noted that since the maximum displacement that a common coordinate measuring machine can measure is 0.2 mm, the preset displacement in this embodiment is 0.2 mm.

[0056] S3. Assemble the stamped part with the vehicle body and inspect the stamped part according to the inspection datum of the vehicle body to obtain the inspection dimensional chain of the stamped part; the inspection datum includes multiple dimensional control directions.

[0057] When assembling stamped parts with the vehicle body, if the stamped parts do not match the body, it indicates a dimensional deviation in the stamped parts. In this case, the stamped parts can be inspected according to the vehicle body's inspection standards to obtain the dimensional chain for inspection. If the stamped parts match the body, it indicates that there is no dimensional deviation in the stamped parts, and no correction is needed.

[0058] Before step S3, the following steps are also included:

[0059] Based on the free determination dimension data, determine whether the stamped part is rotating. If so, correct the dimensions of the stamped part to eliminate the rotation.

[0060] Since the rotation of the stamped part can cause deviations in its own dimensions, after discovering that the stamped part has a deviation in its own dimensions, it is necessary to first rule out the deviation caused by the rotation of the stamped part, and then analyze the positioning surface of the stamped part to determine whether there are any dimensional deviations in the positioning surface of the stamped part.

[0061] S4. Based on the vehicle body inspection standards, break down the inspection dimension chain;

[0062] S5. Collect the dimensions of the stamped parts located in the same dimension control direction and form a unidirectional dimension chain that corresponds one-to-one with multiple dimension control directions;

[0063] S6. Using the main positioning surface of the stamped part as a closed loop, reverse the derivation of each unidirectional dimension chain to determine the dimensional deviation of the main positioning surface in each dimension control direction.

[0064] This is equivalent to using reverse thinking, starting from the idea of ​​a set of dimensions in the same direction, and taking the main positioning surface as a closed loop of the same-direction dimension chain to determine the dimensional deviation of the main positioning surface in each dimension control direction. The dimensional deviation of the main positioning surface in each dimension control direction is the dimensional deviation of the stamped part itself in each dimension control direction. Compared with the existing technology of multi-dimensional mixed control of stamped part dimensions, this method is not only simple and easy to implement, but also more accurate and stable in controlling the dimensions of stamped parts.

[0065] S7. Correct the dimensions of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions.

[0066] It should be noted that while the main locating surface of the stamped part provides support, the stamped part also includes auxiliary locating surfaces. These auxiliary locating surfaces only serve a verification function and do not provide support. When there is a dimensional deviation in the main locating surface, interference may occur in the auxiliary locating surfaces. If the dimensions of the main locating surface are corrected when interference exists in the auxiliary locating surfaces of the stamped part, the interference problem may be exacerbated.

[0067] Before step S7, the following steps are also included:

[0068] Determine whether there is interference on the auxiliary positioning surface of the stamped part; if so, eliminate the interference.

[0069] Step S7 includes the following steps:

[0070] Based on the magnitude of the dimensional deviations of the main positioning surface in multiple dimensional control directions, determine the order of dimensional correction for the main positioning surface in multiple dimensional control directions;

[0071] According to the correction order, the dimensions of the main positioning surface in multiple dimension control directions are corrected sequentially.

[0072] In other words, if the dimensional deviation of the main positioning surface is greatest in the dimension control direction, then the dimension of the main positioning surface in that dimension control direction should be corrected first, which is beneficial for quickly correcting the dimensions of the stamped part.

[0073] It should be noted that after the maximum dimensional deviation of the main positioning surface is corrected, the dimensional deviation of the stamped part itself may be completely eliminated.

[0074] Furthermore, according to the correction order, the dimensions of the main positioning surface in multiple dimensional control directions are corrected sequentially, including the following steps:

[0075] After each correction of the main locating surface in one dimension control direction, the stamped part is inspected again according to the vehicle body inspection benchmark, and it is determined whether the deviation of the stamped part's own dimensions has been completely eliminated. If so, the process ends; if not, the main locating surface is corrected in the next dimension control direction according to the correction sequence.

[0076] In this embodiment, the multiple size control directions include the vehicle's front-to-back direction, the vehicle's left-to-right direction, and the vehicle's up-to-down direction. It can be understood that the front-to-back, left-to-right, and up-to-down directions are mutually perpendicular to form a Cartesian coordinate system. It can also be understood that in the front-to-back direction, the side where the front of the vehicle is located is front, and the side where the rear of the vehicle is located is rear; in the left-to-right direction, the side where the driver's seat is located is left, and the side where the passenger seat is located is right.

[0077] Furthermore, based on the dimensional deviations of the main locating surface in multiple dimensional control directions, the dimensions of the main locating surface are corrected, including the following steps:

[0078] If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from back to front along the front-rear direction of the vehicle body.

[0079] If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from front to back along the front-rear direction of the vehicle body.

[0080] If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from right to left along the left-right direction of the vehicle body.

[0081] If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from left to right along the left-right direction of the vehicle body.

[0082] If the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is from top to bottom along the vertical direction of the vehicle body.

[0083] If the dimensional deviation of the main locating surface in the vertical direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main locating surface in the vertical direction of the vehicle body is from bottom to top along the vertical direction of the vehicle body.

[0084] In existing technologies, the direction from front to back along the vehicle's longitudinal direction is typically considered the positive direction, and the direction from back to front is considered the negative direction. Similarly, the direction from left to right along the vehicle's left-right direction is considered the positive direction, and the direction from right to left along the left-right direction is considered the negative direction. Likewise, the direction from bottom to top along the vehicle's vertical direction is considered the positive direction, and the direction from top to bottom is considered the negative direction. This embodiment uses a vehicle body inspection benchmark commonly used in existing technologies, which is convenient for technicians to operate.

[0085] The stamping part size control method in this embodiment first performs a free judgment on the stamping part in its free state to determine whether there is a deviation in the size of the main positioning hole of the stamping part. When a deviation in the size of the main positioning hole of the stamping part is found, the size of the main positioning hole is corrected so that the size of the main positioning hole meets the requirements. Then, the stamping part is assembled with the vehicle body to determine whether there is a deviation in the size of the stamping part itself. If there is a deviation in the size of the stamping part itself, it indicates that there is a deviation in the size of the main positioning surface of the stamping part. Then, the detection size chain of the stamping part is broken down according to the detection benchmark, and the size set of the stamping part itself located in the same size control direction is collected. This process forms unidirectional dimension chains that correspond one-to-one with multiple dimension control directions. Then, using the main positioning surface of the stamped part as a closed loop, each unidirectional dimension chain is derived to determine the dimensional deviation of the main positioning surface in each dimension control direction. The dimensional deviation of the main positioning surface in each dimension control direction is the dimensional deviation of the stamped part itself in each dimension control direction. Finally, based on the dimensional deviation of the main positioning surface in multiple dimension control directions, the dimension of the main positioning surface is corrected, thereby achieving the purpose of correcting the dimension of the stamped part. Compared with existing technologies, this method can control the dimension of the stamped part more accurately and stably, and improve the dimensional stability of the entire vehicle assembly.

[0086] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for controlling the dimensions of stamped parts, characterized in that, Includes the following steps: Obtain the free determination dimension data of the stamped part in its free state; Based on the free determination dimension data, the size of the main positioning hole of the stamped part is corrected; The stamped part is assembled with the vehicle body, and the stamped part is inspected according to the inspection datum of the vehicle body to obtain the inspection dimension chain of the stamped part. The vehicle body's inspection references include multiple dimensional control directions; Based on the vehicle body inspection benchmark, the inspection dimension chain is broken down; The dimensions of the stamped parts located in the same dimension control direction are collected and formed into a unidirectional dimension chain that corresponds one-to-one with multiple dimension control directions; Using the main positioning surface of the stamped part as a closed loop, each of the same-direction dimension chains is deduced in reverse to determine the dimensional deviation of the main positioning surface in each of the dimension control directions; The dimensions of the main positioning surface are corrected based on the dimensional deviations of the main positioning surface in multiple dimensional control directions; The multiple dimensions control directions include the vehicle body front-to-back direction, the vehicle body left-to-right direction, and the vehicle body up-to-down direction; A method for correcting the size of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions includes the following steps: If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from back to front along the front-rear direction of the vehicle body; If the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the front-rear direction of the vehicle body is from front to back along the front-rear direction of the vehicle body. If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from right to left along the left-right direction of the vehicle body. If the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the left-right direction of the vehicle body is from left to right along the left-right direction of the vehicle body. If the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is positive, then the correction direction of the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is from top to bottom along the vertical direction of the vehicle body. If the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is negative, then the correction direction of the dimensional deviation of the main positioning surface in the vertical direction of the vehicle body is from bottom to top along the vertical direction of the vehicle body.

2. The method for controlling the dimensions of stamped parts according to claim 1, characterized in that, Before breaking down the inspection dimension chain based on the inspection benchmark of the vehicle body, the following steps are also included: Based on the free determination dimension data, it is determined whether the stamped part is rotating. If so, the dimensions of the stamped part are corrected to eliminate the rotation.

3. The method for controlling the dimensions of stamped parts according to claim 1, characterized in that, Before correcting the size of the main positioning surface based on the dimensional deviations of the main positioning surface in the multiple dimensional control directions, the following steps are also included: Determine whether there is interference on the auxiliary positioning surface of the stamped part; if so, eliminate the interference.

4. The method for controlling the dimensions of stamped parts according to claim 1, characterized in that, A method for correcting the size of the main positioning surface based on the dimensional deviations of the main positioning surface in multiple dimensional control directions includes the following steps: Based on the magnitude of the dimensional deviation of the main positioning surface in the multiple dimensional control directions, the correction order of the dimensions of the main positioning surface in the multiple dimensional control directions is determined; According to the correction order, the dimensions of the main positioning surface in multiple dimension control directions are corrected sequentially.

5. The method for controlling the dimensions of stamped parts according to claim 4, characterized in that, The method for sequentially correcting the dimensions of the main positioning surface in multiple dimension control directions according to the correction order includes the following steps: After each correction of the dimension of the main positioning surface in one of the dimension control directions, the stamped part is inspected again according to the inspection benchmark of the vehicle body, and it is determined whether the deviation of the stamped part's own dimension has been completely eliminated. If so, the process ends. If not, then the dimension of the main positioning surface in the next dimension control direction is corrected according to the correction sequence.

6. The method for controlling the dimensions of stamped parts according to claim 1, characterized in that, After correcting the size of the main positioning hole of the stamped part based on the free determination size data, the following steps are also included: Obtain the displacement of the auxiliary positioning hole of the stamped part; Determine whether the displacement of the auxiliary positioning hole of the stamped part is less than the preset displacement. If not, correct the size of the auxiliary positioning hole of the stamped part.

7. The method for controlling the dimensions of stamped parts according to claim 6, characterized in that, The preset displacement is 0.2mm-0.3mm.

8. The method for controlling the dimensions of stamped parts according to claim 1, characterized in that, In obtaining the free determination dimension data of the stamped part in its free state, a coordinate measuring machine is used to measure the stamped part to obtain the free determination dimension data.

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