A method and system for engine head deck height control

Abstract

The application relates to the technical field of mechanical processing size control, in particular to an engine cylinder cover bottom plate size control method and system. The engine cylinder cover bottom plate size control method comprises the following steps: milling a preliminary milling amount from a blank top surface of a cylinder cover blank, taking the top surface after milling as a processing reference; detecting the thickness of a blank bottom plate according to the processing reference; calculating a processing allowance adjustment amount according to the thickness of the blank bottom plate and recording the processing allowance adjustment amount on a carrier; calculating a processing allowance according to the processing allowance adjustment amount; completing the distribution of the processing allowance; and completing cylinder cover processing. The engine cylinder cover bottom plate size control method and system provided in the application can solve the problem that, in the related art, when a cylinder cover blank is processed according to a fixed processing allowance, the thickness of the processed bottom plate is unqualified due to the variable thickness of the blank bottom plate.

Description

A method and system for controlling the dimensions of an engine cylinder head base plate Technical Field

[0001] This application relates to the field of machining dimension control technology, and in particular to a method and system for controlling the dimensions of an engine cylinder head base plate. Background Technology

[0002] The thickness of the engine cylinder head base plate, measured from the bottom surface of the cylinder head to the surface of the coolant jacket, is a critical dimension affecting the engine's thermal performance. Since the coolant jacket surface is located inside the cylinder head and cannot be machined, this dimension is ensured by the machining allowance of the bottom surface.

[0003] In related technologies, the top and bottom surfaces of the cylinder head blank are typically milled, with the machining allowance being the difference between the total height of the cylinder head blank and the total height of the cylinder head specified in the design drawings. Current machining processes distribute the machining allowance evenly across the top and bottom surfaces, fixing it to the machining equipment; this allowance is generally a fixed value.

[0004] However, the existing cylinder head base plate processing method does not measure the cylinder head blank base plate in advance, and cannot adjust the processing allowance according to the actual thickness variation of the cylinder head blank base plate. Furthermore, in actual production, the position of the cooling water jacket surface of the cylinder head blank may change due to factors such as molding and casting, which will cause fluctuations in the base plate thickness. Sometimes it may exceed the range specified in the product drawings, resulting in scrapped parts and increased wear. Summary of the Invention

[0005] This application provides a method and system for controlling the dimensions of an engine cylinder head base plate, in order to solve the problem in the related art where the thickness of the base plate is unqualified when machining a cylinder head blank with a fixed machining allowance.

[0006] To achieve the above objectives, in a first aspect, a method for controlling the dimensions of an engine cylinder head base plate is provided, which includes the following steps:

[0007] The initial milling amount is removed by milling off the top surface of the cylinder head blank, and the milled top surface is used as the machining reference.

[0008] The thickness of the blank base plate is measured according to the aforementioned processing datum.

[0009] Calculate the machining allowance adjustment amount based on the thickness of the blank base plate and record it on the carrier;

[0010] Calculate the machining allowance based on the adjustment amount;

[0011] Complete the allocation of machining allowance;

[0012] Complete the cylinder head machining.

[0013] In some embodiments, detecting the thickness of the blank base plate according to the processing datum includes:

[0014] Using the milled top surface as a support surface, the cylinder head blank is placed on the cylinder head testing equipment to test the thickness of the blank bottom plate.

[0015] In some embodiments, detecting the thickness of the blank base plate specifically includes:

[0016] Multiple measuring points are selected, and the thickness at each measuring point is measured. Specifically, the number of measuring points is consistent with the number of measuring points on the finished cylinder head, and varies depending on the type of cylinder head.

[0017] In some embodiments, the machining allowance adjustment is calculated based on the thickness of the blank base plate, specifically including:

[0018] Obtain the predicted thickness values ​​for each measuring point;

[0019] Based on the nominal thickness value and the predicted thickness value, the thickness deviation value of the measuring point is obtained, and the deviation range is obtained;

[0020] The deviation range is compared with the thickness tolerance. Specifically, the thickness tolerance is a specific value, usually specified for all measuring points, and varies with the cylinder head type. If the deviation range is greater than the thickness tolerance, the cylinder head base plate is not up to standard and cannot be remedied by adjusting the machining allowance. In this case, the current cylinder head is a defective product, and the testing equipment should issue an alarm signal and scrap it. If the deviation range is not greater than the thickness tolerance, the average value of the two endpoints of the deviation range is taken as the machining allowance adjustment amount.

[0021] In some embodiments, obtaining the predicted thickness values ​​for each measuring point includes:

[0022] The thickness value at each measuring point is subtracted from the fixed machining allowance to obtain the predicted thickness value at each measuring point.

[0023] In some embodiments, the thickness deviation value at the measuring point is obtained based on the nominal thickness value and the predicted thickness value, and the deviation range includes:

[0024] The thickness deviation value of each measuring point is obtained by subtracting the predicted thickness value from the nominal thickness value.

[0025] The maximum and minimum values ​​of the thickness deviation at each measuring point are selected, and the range from the minimum to the maximum thickness deviation is taken as the deviation range.

[0026] In some embodiments, calculating the machining allowance includes the following steps:

[0027] The bottom surface machining allowance is obtained by summing the fixed machining allowance and the machining allowance adjustment amount.

[0028] The machining allowance for the top surface is obtained by subtracting the machining allowance adjustment amount from the fixed machining allowance for the top surface, and then subtracting the initial milling amount.

[0029] In some embodiments, the allocation of the machining allowance includes:

[0030] The machining allowance is compared with the maximum allowance allowed by the cylinder head bottom plate machining equipment each time. If it exceeds the allowance, the machining is performed in multiple stages.

[0031] In some embodiments, recording the machining allowance adjustment amount on the carrier includes:

[0032] A cylinder head inspection device generates a QR code, which is then printed on the cylinder head blank. The QR code information includes a cylinder head identification code and a machining allowance adjustment amount. When the cylinder head needs to be machined, the QR code is scanned to obtain the stored cylinder head identification code and machining allowance adjustment amount. The machining allowance adjustment amount is stored in a macro variable via serial communication. Simultaneously, the cylinder head identification code and machining allowance adjustment amount are saved in a storage unit for easy tracking of the cylinder head machining process.

[0033] Secondly, an engine cylinder head base plate dimension control system is provided, which is used to execute an engine cylinder head base plate dimension control method as described above, comprising:

[0034] Cylinder head pre-machining module, which is used to mill off the initial milling amount on the top surface of the cylinder head blank;

[0035] Cylinder head inspection equipment is used to inspect the thickness of the blank base plate, calculate the machining allowance adjustment amount based on the thickness of the blank base plate, and record it on the carrier.

[0036] Cylinder head base plate processing equipment is used to extract the processing allowance adjustment amount from the carrier, and calculate and allocate the processing allowance according to the processing allowance adjustment amount to complete the processing of the cylinder head.

[0037] The beneficial effects of the technical solution provided in this application include:

[0038] This application provides a method and system for controlling the dimensions of an engine cylinder head base plate. First, a preliminary milling amount is milled off the top surface to form a top surface parallel to the machine positioning surface, serving as a machining reference for subsequent thickness detection and processing. Before processing, the actual thickness of the cylinder head blank base plate is detected to obtain the machining allowance adjustment amount, thereby obtaining the machining allowance for each cylinder head. This ensures both the total height and related height dimensions of the cylinder head, as well as the thickness dimension of the base plate. This allows cylinder heads that would be defective if processed with a fixed machining allowance to become qualified products, and also reduces the dimensional deviation of cylinder heads with excessively large thickness deviations after processing with a fixed machining allowance. Therefore, it solves the problem in related technologies where the thickness of the base plate is unpredictable when processing cylinder head blanks with a fixed machining allowance, resulting in unqualified base plate thickness. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 is a structural diagram and milling schematic diagram of the cylinder head blank provided in the embodiment of this application;

[0041] Figure 2 is an enlarged view of point A in Figure 1;

[0042] Figure 3 is a system configuration diagram of cylinder head bottom plate processing provided in an embodiment of this application;

[0043] Figure 4 is an operation flowchart of the engine cylinder head bottom plate size control method provided in the embodiment of this application;

[0044] Figure 5 is a flowchart of the calculation of machining allowance adjustment amount in the engine cylinder head base plate size control method provided in the embodiment of this application.

[0045] In the diagram: 1. Cylinder head pre-machining module; 2. Cylinder head inspection equipment; 20. Cylinder head base plate thickness measurement module; 21. Machining allowance adjustment calculation module; 22. QR code generation and printing module; 3. Cylinder head base plate machining equipment; 30. QR code scanning and recognition module and storage module; 31. Machining allowance calculation and setting module; 32. Cylinder head base plate machining module; 4. Cylinder head; 5. Blank bottom surface; 6. Blank top surface; 7. Positioning plane; 8. Cooling water jacket surface. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] This application provides a method for controlling the dimensions of an engine cylinder head base plate, which can solve the problem in related technologies where the thickness of the base plate is unqualified when machining a cylinder head blank with a fixed machining allowance.

[0048] Referring to Figures 1 to 5, this application provides a method for controlling the dimensions of an engine cylinder head base plate, including the following steps:

[0049] S100. Mill off the initial milling amount on the top surface 6 of the cylinder head blank, and use the milled top surface as the machining reference.

[0050] Specifically, this step is the initial machining step of cylinder head 4. The top surface 6 of the cylinder head blank is milled to form a top surface parallel to the blank machining positioning plane 7 (i.e., the milled top surface), which serves as the reference for the subsequent bottom plate thickness detection step and bottom surface machining step.

[0051] Furthermore, this step uses the positioning plane 7 prefabricated on the bottom surface 5 of the cylinder head blank as the pre-processing reference to mill the top surface 6 of the cylinder head blank. The positioning plane 7 is prefabricated during the casting of the cylinder head blank. Specifically, it is a concave surface distributed in a triangle on the bottom surface 5 of the blank. This concave surface is a plane parallel to the bottom surface 5 of the blank.

[0052] Optionally, the initial milling depth can be selected as 2mm.

[0053] S200. Based on the machining reference obtained in step S100, detect the thickness of the blank base plate.

[0054] Specifically, using the milled top surface as the support surface, the cylinder head blank is placed flat on the cylinder head testing equipment 2, and the thickness of the bottom plate of the cylinder head blank is scanned and tested to obtain the thickness of the bottom plate of the blank.

[0055] Preferably, after the scanning is completed, the cylinder head inspection device 2 automatically measures and records the thickness of the bottom plate at the designated measuring point of the cylinder head blank.

[0056] Preferably, multiple measuring points are selected when inspecting the blank base plate, and the thickness of each measuring point is measured. Specifically, the number of measuring points is consistent with the number of measuring points in the finished cylinder head, and varies depending on the type of cylinder head. Taking a certain type of cylinder head as an example, it has 6 cylinders, each with 2 intake valve seat holes and 2 exhaust valve seat holes, arranged in a grid pattern. The area between adjacent valve seat holes is the nose bridge area, and one measuring point is specified in each nose bridge area, for a total of 24 measuring points in the entire cylinder head. Another type of cylinder head also has 6 cylinders, but the nose bridge area is arranged in a skewed grid pattern, with 3 measuring points specified in each nose bridge area, for a total of 72 measuring points in the entire cylinder head.

[0057] S300. Based on the thickness of the blank base plate measured in step S200, calculate the machining allowance adjustment amount and record it on the carrier.

[0058] Specifically, it includes the following steps:

[0059] S310, Obtain the predicted thickness value for each measuring point.

[0060] Specifically, the predicted thickness of each measuring point is obtained by subtracting the thickness measured in step S200 from the fixed machining allowance. It should also be noted that the fixed machining allowance is a specific value, specifically the machining allowance for the milling operation used in the existing machining process.

[0061] Optionally, the fixed machining allowance can be selected as 5mm.

[0062] The purpose of this step is to obtain the predicted thickness of each measuring point on the finished cylinder head when it is machined using the fixed machining allowance method of the existing technology.

[0063] S320: Obtain the thickness deviation value of each measuring point.

[0064] Specifically, the thickness deviation value of each measuring point is obtained by subtracting the predicted thickness value from the nominal thickness value obtained in step S310. It should also be noted that the nominal value is a dimensional value specified during product design to ensure the product meets specified requirements. In the method provided in this embodiment, the nominal value is the thickness dimension of each measuring point on the base plate specified during cylinder head design to ensure the cylinder head meets functional requirements. For any given measuring point, its nominal value is a definite value.

[0065] S330, obtain the thickness deviation range.

[0066] Specifically, the maximum and minimum values ​​of the thickness deviation values ​​obtained in step S320 are taken from each measuring point, and the range from the minimum thickness deviation value to the maximum thickness deviation value is taken as the deviation range.

[0067] S340. Determine whether the cylinder head thickness deviation range is greater than the thickness tolerance.

[0068] Specifically, the thickness tolerance is a specific value, usually specified as the same for all measuring points, and varies depending on the cylinder head type. Furthermore, the nominal value in step S320 above is allowed to deviate from the actual size within a certain range (i.e., the tolerance range).

[0069] Specifically, if the cylinder head thickness deviation exceeds the thickness tolerance, proceed to step S350: cylinder head scrapping. Since the cylinder head thickness deviation exceeds the thickness tolerance, it cannot be remedied by adjusting the machining allowance; therefore, the current cylinder head is a defective product, and the testing equipment should issue an alarm signal and process it as scrap.

[0070] If the cylinder head thickness deviation range is less than or equal to the thickness tolerance, proceed to step S360: calculate the machining allowance adjustment amount.

[0071] Specifically, S360 includes the following steps:

[0072] Take the two endpoint values ​​of the thickness deviation range, and take the average of these two endpoint values. Use the average value as the machining allowance adjustment amount.

[0073] Optionally, recording the machining allowance adjustment amount on the carrier in step S300 includes the following steps (steps S400 and S500):

[0074] S400. Use cylinder head inspection equipment 2 to generate a QR code, print the QR code on the cylinder head blank, and the QR code information includes the cylinder head identification code and machining allowance adjustment amount.

[0075] Specifically, the cylinder head inspection device 2 includes a QR code generation and printing module 22, which generates a QR code and prints it on the cylinder head blank for easy follow-up tracking.

[0076] S500, QR code recognition and storage.

[0077] When the cylinder head base plate processing equipment 3 needs to process the cylinder head 4, the cylinder head identification code and processing allowance adjustment amount stored in the QR code are obtained by scanning and recognizing the QR code. The processing allowance adjustment amount is stored in the macro variable through serial communication. At the same time, the cylinder head identification code and processing allowance adjustment amount are saved in the storage unit to facilitate the backtracking of the cylinder head processing process.

[0078] S600. Calculate the machining allowance based on the machining allowance adjustment amount obtained in step S300.

[0079] Specifically, the machining allowance includes the bottom surface machining allowance and the top surface machining allowance, and the calculation formula is as follows:

[0080] Bottom surface machining allowance = Fixed bottom surface machining allowance + Machining allowance adjustment amount;

[0081] Top surface machining allowance = Fixed top surface machining allowance - Machining allowance adjustment amount - 2;

[0082] Specifically, the 2 subtracted from the top surface machining allowance calculation formula is the initial milling amount of 2mm that is milled off the top surface of the cylinder head blank in step S100, which is the machining amount of the top surface in the initial machining process of cylinder head 4.

[0083] Furthermore, the fixed machining allowance is the machining allowance for the milling process used in the existing technology, usually half for the top surface and half for the bottom surface. Typically, this value is 5mm.

[0084] Furthermore, when the machining allowance adjustment is positive, it indicates that the predicted thickness is larger, meaning that the cylinder head thickness obtained by the existing machining method is too large. Therefore, it is necessary to increase the bottom surface machining allowance to compensate for the cylinder head thickness. That is, bottom surface machining allowance = bottom surface fixed machining allowance + machining allowance adjustment.

[0085] When the machining allowance adjustment is negative, it indicates that the predicted thickness is too small, meaning that the cylinder head thickness obtained by the existing machining method is too small. Therefore, the bottom machining allowance needs to be reduced. That is, bottom machining allowance = fixed machining allowance + machining allowance adjustment (negative value).

[0086] On the other hand, the total thickness c of the cylinder head 4 (see Figure 1, i.e. the distance between the bottom and top surfaces) is a specified dimension. If the machining amount of the bottom surface increases, the machining amount of the top surface must be reduced. Therefore, the machining allowance of the top surface = fixed machining allowance - machining allowance adjustment amount - 2. Here, 2mm is the amount that has been machined away from the top surface at the beginning.

[0087] S700, completes the allocation and setting of machining allowance.

[0088] Specifically, the machining allowance obtained in step S400 is compared with the maximum allowable machining allowance of the cylinder head bottom plate machining equipment 3 for each operation. If the machining allowance exceeds the maximum allowable machining allowance of the cylinder head bottom plate machining equipment 3 for each operation, the machining is split into multiple milling operations.

[0089] S800, complete the machining of cylinder head 4. Specifically, the top and bottom surfaces of cylinder head 4 are machined separately.

[0090] The following is a schematic diagram of the cylinder head blank, with the total height of the cylinder head blank being d, where a is the machining allowance for the bottom surface and b is the machining allowance for the top surface. Both a and b are the parts that need to be milled off. The total height of the cylinder head after milling is c.

[0091] As shown in Figure 2, the thickness of the base plate before processing is m, the thickness of the base plate after processing is n, and the processing allowance on the bottom surface is a. The relationship between m, n, and a is mn = a.

[0092] In existing processing methods, the top surface 6 of the blank is usually milled first using the positioning plane 7 as the machining reference, then the bottom surface 5 of the blank is milled using the milled top surface as the reference, and finally other height dimensions (i.e., e in Figure 1) are machined using the milled bottom surface as the reference. However, the thickness of the cylinder head base plate depends not only on the machining allowance of the bottom surface, but also on the cooling water jacket surface 8 that maintains the blank state. As shown in Figures 1 and 2, the thickness of the cylinder head base plate is the distance between the cylinder head bottom surface (outer surface of the cylinder head base plate) and the cooling water jacket surface 8 (inner surface of the cylinder head base plate, which is the channel for the cylinder head cooling water). Changes in the position of the cooling water jacket surface 8 during the molding and casting process will cause changes in the thickness of the base plate, resulting in fluctuations in the thickness of the base plate. Sometimes, this can exceed the range specified in the product drawings, causing the part to be scrapped.

[0093] Therefore, this application provides a method for controlling the dimensions of an engine cylinder head base plate. First, a preliminary milling amount is milled off the top surface 6 of the blank to form a top surface parallel to the machine positioning surface, serving as a machining reference for subsequent thickness detection and processing. Before processing, the actual thickness of the cylinder head blank base plate is detected to obtain the machining allowance adjustment amount, thereby obtaining the machining allowance of the cylinder head. This ensures both the total cylinder head height c and related height dimensions, while also guaranteeing the base plate thickness dimension. This allows cylinder heads that would be defective if processed with a fixed machining allowance to become qualified products, and also reduces the dimensional deviation of cylinder heads with excessively large thickness deviations after processing with a fixed machining allowance. Therefore, it can solve the problem in related technologies where the thickness of the base plate is unpredictable when processing cylinder head blanks with a fixed machining allowance, resulting in unqualified base plate thickness.

[0094] Specifically, in step S100 above, the initial milling amount is milled off the top surface 6 of the cylinder head blank. This is the initial machining step. The initial milling amount should be less than the machining allowance b on the top surface, that is, a machining allowance is reserved for finishing in subsequent steps. The amount is adjusted according to the machining allowance for further machining.

[0095] This application embodiment also provides an engine cylinder head base plate size control system, including a cylinder head detection device 2 and a cylinder head base plate processing device 3. The cylinder head detection device 2 is used to detect the thickness of the blank base plate, calculate the processing allowance adjustment amount based on the thickness of the blank base plate, and record it on a carrier. It also calculates the processing allowance based on the processing allowance adjustment amount and completes the allocation of the processing allowance.

[0096] Specifically, the cylinder head testing device 2 is used to perform steps S200 to S400, and the cylinder head testing device 2 includes:

[0097] The cylinder head base plate thickness measurement module 20 is used to perform the above step S200, that is, to detect the thickness of the blank base plate. Optionally, the cylinder head base plate thickness measurement module 20 is an ultrasonic testing device, which can detect the thickness of the blank base plate without damaging the cylinder head.

[0098] The machining allowance adjustment calculation module 21 is used to execute the above step S300. Based on the thickness of the blank base plate measured by the cylinder head base plate thickness measuring module 20 in step S200, it executes the process shown in Figure 5 (i.e., S310 to S360) to determine whether the dimensions of the cylinder head 4 are qualified. If they are not qualified, step S350 is executed to reject the cylinder head 4. If they are qualified, step S360 is further executed to calculate the specific value of the machining allowance adjustment.

[0099] The QR code generation and printing module 22 is used to combine the cylinder head identification code and the machining allowance adjustment amount obtained in step S300 into a QR code and print it on the current cylinder head blank for subsequent backtracking.

[0100] Furthermore, the cylinder head bottom plate processing equipment 3 is used to perform the above steps S500 to S800, and the cylinder head bottom plate processing equipment 3 includes:

[0101] Specifically, after the QR code is generated and printed in step S400, the cylinder head 4 is removed from the cylinder head inspection device 2 and transferred to the cylinder head base plate processing device 3. The QR code is scanned using the QR code scanning and storage module 30 to obtain the cylinder head identification code and machining allowance adjustment amount, which are then stored in the QR code scanning and storage module 30 for subsequent backtracking. Optionally, the machining allowance adjustment amount can be transmitted to the cylinder head base plate processing device 3 via a serial communication port as a macro variable for storage.

[0102] The machining allowance calculation and setting module 31 is used to execute the above step S600, and calculate the machining allowance based on the fixed machining allowance and the machining allowance adjustment amount obtained in step S300. Specifically, the machining allowance calculation and setting module 31 reads the machining allowance adjustment amount from the macro variable, calculates the machining allowance of the top and bottom surfaces of the cylinder head according to the formula, and completes the setting of the machining allowance.

[0103] The cylinder head base plate machining module 32 is used to complete the machining of the top and bottom surfaces of the cylinder head, and finally obtain the total cylinder head height c, base plate thickness n and other height dimensions e as required by the drawings.

[0104] Furthermore, the engine cylinder head base plate size control system also includes a cylinder head pre-processing module 1. The cylinder head pre-processing module 1 is used to perform the above step S100. As shown in Figure 1, the cylinder head pre-processing module 1 mills the top surface 6 of the cylinder head blank to obtain a top surface parallel to the machine positioning surface, which serves as a processing reference for subsequent thickness detection and processing.

[0105] The embodiment of this application provides a method and system for controlling the dimensions of an engine cylinder head base plate. Before machining the cylinder head blank, the actual thickness of the cylinder head blank base plate is detected, and the machining allowance of the bottom and top surfaces of the cylinder head 4 is adjusted in real time. While ensuring the total height c of the cylinder head and related height dimensions, the cylinder head 4 that would be defective due to direct milling with a fixed machining allowance according to the original machining method becomes a qualified product. It can also reduce the dimensional deviation of the cylinder head 4 that would result in excessive thickness deviation after machining due to direct milling with a fixed machining allowance according to the original machining method, thus making it a qualified product. This improves the pass rate of the cylinder head base plate and reduces losses.

[0106] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0107] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0108] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling the dimensions of an engine cylinder head base plate, characterized in that, It includes the following steps: The initial milling amount is milled off on the top surface (6) of the cylinder head blank, and the milled top surface is used as the machining reference. The thickness of the blank base plate is detected according to the machining reference. The machining allowance adjustment amount is calculated according to the thickness of the blank base plate and recorded on the carrier. The machining allowance is calculated according to the machining allowance adjustment amount. The machining allowance allocation is completed. The cylinder head (4) machining is completed. The thickness of the blank base plate is detected according to the machining reference, including: using the milled top surface as the support surface, the cylinder head blank is placed on the cylinder head detection device (2) and the thickness of the blank base plate is detected. The thickness of the blank base plate is detected, specifically including: selecting multiple measuring points and measuring the thickness of each measuring point. The machining allowance adjustment amount is calculated according to the thickness of the blank base plate, specifically including: obtaining the thickness prediction value of each measuring point. The thickness is calculated according to the nominal thickness value and the thickness prediction value. Obtain the thickness deviation value at each measuring point and determine the deviation range; compare the deviation range with the thickness tolerance. If the deviation range is greater than the thickness tolerance, the cylinder head base plate is dimensionally unqualified and scrapped. If the deviation range is not greater than the thickness tolerance, take the average of the two endpoints of the deviation range as the machining allowance adjustment amount; obtaining the predicted thickness value for each measuring point includes: subtracting the thickness value of each measuring point from the fixed machining allowance to obtain the predicted thickness value for each measuring point; obtaining the thickness deviation value at each measuring point based on the nominal thickness value and the predicted thickness value, and determining the deviation range includes: subtracting the predicted thickness value of each measuring point from the nominal thickness value to obtain the thickness deviation value for each measuring point; selecting the maximum and minimum values ​​among the thickness deviation values ​​at each measuring point, and taking the range from the minimum to the maximum thickness deviation value as the deviation range.

2. The method for controlling the dimensions of the engine cylinder head base plate as described in claim 1, characterized in that, Calculating machining allowances includes the following steps: The bottom surface machining allowance is obtained by adding the fixed machining allowance and the machining allowance adjustment amount; the top surface machining allowance is obtained by subtracting the machining allowance adjustment amount from the fixed machining allowance and then subtracting the initial milling amount.

3. The method for controlling the dimensions of the engine cylinder head base plate as described in claim 1, characterized in that, The allocation of the machining allowance includes: comparing the machining allowance with the maximum allowance allowed by the cylinder head bottom plate machining equipment (3) each time. If it exceeds the allowance, the machining is performed in multiple steps.

4. The method for controlling the dimensions of the engine cylinder head base plate as described in claim 1, characterized in that, Recording the machining allowance adjustment amount on the carrier includes: using a cylinder head inspection device (2) to generate a QR code, printing the QR code on the cylinder head blank, and the QR code information includes the cylinder head identification code and the machining allowance adjustment amount.

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