CN117272524A - Diesel engine cylinder hole shape design method, system, electronic equipment and storage medium - Google Patents
Diesel engine cylinder hole shape design method, system, electronic equipment and storage medium Download PDFInfo
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- CN117272524A CN117272524A CN202311566849.0A CN202311566849A CN117272524A CN 117272524 A CN117272524 A CN 117272524A CN 202311566849 A CN202311566849 A CN 202311566849A CN 117272524 A CN117272524 A CN 117272524A
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- 239000010687 lubricating oil Substances 0.000 description 1
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- 239000010705 motor oil Substances 0.000 description 1
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Abstract
The application provides a diesel engine cylinder hole shape design method, a system, electronic equipment and a storage medium, and relates to the technical field of vehicle manufacturing, wherein the diesel engine cylinder hole shape design method comprises the following steps: acquiring the rated working condition of an engine; determining the deformation trend of the cylinder hole according to the rated working condition of the engine; determining a novel cylinder hole shape according to the deformation trend of the cylinder hole; wherein, the determining a novel cylinder hole shape according to the deformation trend of the cylinder hole includes: reducing the aperture of a heated expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole; and/or increasing the aperture of the non-thermal expansion area of the cylindrical cylinder bore according to the deformation tendency of the cylinder bore. The deformed cylinder hole can be made to be a regular shape as much as possible, friction between the cylinder hole and the piston is avoided as much as possible, the service lives of the cylinder hole and the piston are prolonged, and the oil consumption of the engine is reduced.
Description
Technical Field
The invention relates to the technical field of vehicle manufacturing, in particular to a diesel engine cylinder hole shape design method, a diesel engine cylinder hole shape design system, electronic equipment and a storage medium.
Background
At present, with the improvement of the explosion pressure of an engine, when the cylinder hole of the engine works, the cylinder hole of the engine can be deformed severely along with the rise of the explosion pressure of the engine, the deformed shape of the cylinder hole can cause the problems of accelerated abrasion of a piston and the cylinder hole, rising of engine friction and piston knocking noise and the like.
Therefore, it is needed to provide a diesel engine cylinder hole shape design method to at least solve the technical problems of the prior art that the abrasion of the piston and the cylinder hole is accelerated, the engine friction and the piston knocking noise are increased due to serious deformation of the cylinder hole in the working process of the engine.
Disclosure of Invention
The application provides a diesel engine cylinder hole shape design method, a diesel engine cylinder hole shape design system, electronic equipment and a storage medium, which at least solve the technical problems of accelerated abrasion of a piston and a cylinder hole, and increased engine friction and piston knocking noise caused by serious cylinder hole deformation in the working process of an engine in the related technology.
According to an aspect of the embodiments of the present application, there is provided a diesel engine cylinder bore shape design method, including: acquiring the rated working condition of an engine; determining the deformation trend of the cylinder hole according to the rated working condition of the engine; determining a novel cylinder hole shape according to the deformation trend of the cylinder hole; wherein, the determining a novel cylinder hole shape according to the deformation trend of the cylinder hole includes: reducing the aperture of a heated expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole; and/or increasing the aperture of the non-thermal expansion area of the cylindrical cylinder bore according to the deformation tendency of the cylinder bore.
As an alternative embodiment, the novel cylinder hole shape is a shape in which the aperture gradually increases from one side to the other side.
As an alternative embodiment, the rated engine operating conditions include: at rated power and rated rotational speed, the engine is under load, mechanical load and thermal load.
As an alternative embodiment, the determining the deformation trend of the cylinder hole according to the rated working condition of the engine includes: determining an in-cylinder combustion process; determining an engine thermal load from the in-cylinder combustion process; determining an engine mechanical load; and determining the deformation trend of the cylinder hole according to the engine thermal load and the engine mechanical load.
As an alternative embodiment, the determining in-cylinder combustion process comprises: acquiring the temperature and heat transfer coefficient of the wall surface of the cylinder hole; and determining an in-cylinder combustion calculation model according to the temperature of the wall surface of the cylinder hole and the heat transfer coefficient and the cylinder pressure curve.
As an alternative embodiment, said determining the engine heat load according to said in-cylinder combustion process comprises: extracting a fluid domain grid model of an engine body and a cooling water jacket; and determining the engine heat load according to the engine body and the cooling water jacket fluid domain grid model.
As an alternative embodiment, said determining the engine mechanical load comprises: and applying cylinder explosion pressure to the top surface of the finite element model of the piston, the land area and the fire surface of the cylinder cover in a surface load mode.
According to still another aspect of the present application, there is provided a diesel engine cylinder bore shape design system including: the working condition acquisition module is used for acquiring the rated working condition of the engine; the deformation trend determining module is used for determining the deformation trend of the cylinder hole according to the rated working condition of the engine; and the cylinder hole shape determining module is used for determining a novel cylinder hole shape according to the deformation trend of the cylinder hole.
According to yet another aspect of the present application, there is provided an electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus, the memory being for storing a computer program; the processor is configured to execute the diesel engine cylinder bore shape design method steps by running the computer program stored on the memory.
According to another aspect of the present application, there is provided a computer readable storage medium, wherein a computer program is stored in the storage medium, wherein the computer program is arranged to execute the diesel engine cylinder bore shape design method steps when run.
In the embodiment of the application, a diesel engine cylinder hole shape design method is provided, and a novel cylinder hole shape can be determined according to the deformation trend of the cylinder hole; wherein, the determining a novel cylinder hole shape according to the deformation trend of the cylinder hole includes: reducing the aperture of a heated expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole; and/or increasing the aperture of the non-thermal expansion area of the cylindrical cylinder bore according to the deformation tendency of the cylinder bore. By the arrangement, the deformed cylinder hole can be made to be a regular shape as much as possible, friction between the cylinder hole and the piston is avoided as much as possible, the service lives of the cylinder hole and the piston are prolonged, and the engine oil consumption is reduced. The problems of accelerated abrasion of the piston and the cylinder hole, increased engine friction and piston knocking noise and the like caused by serious deformation of the cylinder hole when the engine works in the prior art are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
For a clearer description of an embodiment of the invention or of the solutions of the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiment or of the prior art, it being obvious to a person skilled in the art that other drawings can be obtained from these without inventive effort;
fig. 1 is a schematic flow chart of a diesel engine cylinder bore shape design method according to an embodiment of the present application;
FIG. 2 is a novel cylinder bore shape provided in accordance with an embodiment of the present application;
FIG. 3 is another novel cylinder bore shape provided in accordance with an embodiment of the present application;
FIG. 4 is a further novel cylinder bore shape provided in accordance with an embodiment of the present application;
FIG. 5 is a further novel cylinder bore shape provided in accordance with an embodiment of the present application;
FIG. 6 is a further novel cylinder bore shape provided in accordance with an embodiment of the present application;
fig. 7 is a schematic structural diagram of an alternative electronic device according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, with the improvement of the explosion pressure of an engine, when the cylinder hole of the engine works, the cylinder hole of the engine can be deformed severely along with the rise of the explosion pressure of the engine, and the deformed shape of the cylinder hole can cause the problems of accelerated abrasion of a piston and the cylinder hole, rising of engine friction and piston knocking noise and the like.
As shown in fig. 1, in an embodiment of the present application, there is provided a diesel engine cylinder bore shape designing method including:
s1, acquiring rated working conditions of an engine;
s2, determining the deformation trend of the cylinder hole according to the rated working condition of the engine;
s3, determining a novel cylinder hole shape according to the deformation trend of the cylinder hole;
wherein, the determining a novel cylinder hole shape according to the deformation trend of the cylinder hole includes:
reducing the aperture of a heated expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole;
and/or the number of the groups of groups,
and increasing the aperture of the non-thermal expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole.
Specifically, according to the mode of reducing the aperture of the heated expansion area of the cylindrical cylinder hole, increasing the aperture of the non-heated expansion area of the cylindrical cylinder hole or simultaneously reducing the aperture of the heated expansion area of the cylindrical cylinder hole and increasing the aperture of the non-heated expansion area of the cylindrical cylinder hole, the deformed cylinder hole forms a regular and ideal shape body as much as possible, friction with a piston is avoided as much as possible, abrasion of the cylinder hole and the piston is reduced, and meanwhile, the problems of engine friction, rising of knocking noise of the piston and the like are solved.
As an alternative embodiment, the novel cylinder hole shape is a shape in which the aperture gradually increases from one side to the other side.
Alternatively, according to an alternative engine rated condition, the heated condition of the cylinder bore may be obtained as a tendency of gradually decreasing from one end to the other end, so that the cylinder bore may be set to a shape in which the bore diameter gradually increases from one side to the other side, so that the cross-sectional area of the cylinder bore at the end with severe thermal expansion is minimized.
It should be understood and noted that the model of the diesel engine is not limited, and the diesel engine can be applied to various diesel engines according to actual demands, however, the rated working conditions of different diesel engines are different, so that the deformation trend of the cylinder holes of different diesel engines under the rated working conditions is different, and the novel cylinder hole shape is determined according to the deformation trend of the cylinder holes, so that the aperture of a heated expansion area of the cylindrical cylinder hole is reduced, or the aperture of a non-heated expansion area of the cylindrical cylinder hole is increased, so that the abrasion of a piston and the cylinder hole is reduced, the purpose of reducing engine friction and piston knocking noise or the cylinder hole shape of other beneficial effects which can be achieved by other schemes are met, the specific shape of the novel cylinder hole is not limited, the novel cylinder hole can be a round table body as shown in fig. 2-6, the outer contour as shown in fig. 3 can be an irregular shape, the area of the cross section of the cylinder hole from one end to the other end is sequentially increased, the aperture of the middle part as shown in fig. 4 is also can be a shape of the middle part with larger aperture or the two ends as shown in fig. 5, and the aperture of the middle part as shown in the two ends is gradually reduced.
Wherein, it is also noted that the aperture of the heated expansion area of the cylindrical cylinder hole is reduced according to the deformation trend of the cylinder hole; and/or in the embodiment of increasing the aperture of the non-heated expansion area of the cylindrical cylinder hole, specifically, the aperture of the non-heated expansion area of the cylindrical cylinder hole and the aperture of the non-heated expansion area of the cylindrical cylinder hole are decreased, and the aperture of the non-heated expansion area of the cylindrical cylinder hole is increased, so that the shape of the novel cylinder hole is determined according to the deformation degree of the original cylinder hole when the engine works, and a regular shape body is formed after the novel cylinder hole is deformed under the rated working condition of the engine as much as possible so as to reduce the friction degree of the cylinder hole and the piston and reduce the abrasion of the cylinder hole.
As an alternative embodiment, the rated engine operating conditions include: at rated power and rated rotational speed, the engine is under load, mechanical load and thermal load.
As an alternative embodiment, the determining the deformation trend of the cylinder hole according to the rated working condition of the engine includes: determining an in-cylinder combustion process; determining an engine thermal load from the in-cylinder combustion process; determining an engine mechanical load; and determining the deformation trend of the cylinder hole according to the engine thermal load and the engine mechanical load.
As an alternative embodiment, the determining in-cylinder combustion process comprises: acquiring the temperature and heat transfer coefficient of the wall surface of the cylinder hole; and determining an in-cylinder combustion calculation model according to the temperature of the wall surface of the cylinder hole and the heat transfer coefficient and the cylinder pressure curve.
Specifically, the combustion process in the engine cylinder under the rated working condition is calculated based on the conversion. And (5) calibrating a combustion calculation model through a cylinder pressure curve to obtain the temperature and heat transfer coefficient of the wall surface of the cylinder hole.
And (3) deriving the temperature and heat transfer coefficient of each node of the cylinder inner wall surface, the fire surface and the air inlet and outlet passage area through a converge software HTC-map module, and manufacturing a profile file.
As an alternative embodiment, said determining the engine heat load according to said in-cylinder combustion process comprises: extracting a fluid domain grid model of an engine body and a cooling water jacket; and determining the engine heat load according to the engine body and the cooling water jacket fluid domain grid model.
Specifically, the fluid domain grid models of the engine body and the cooling water jacket can be extracted, and calculation and analysis are carried out through fluent, wherein the CFD calculation of the cooling water jacket adopts a speed inlet, a pressure outlet and a k-e double-pass model and a standard wall function. A fluid-solid coupling surface is arranged between the cooling water jacket and the engine body. The boundary conditions of the heat of the cylinder wall surface, the fire surface and the air inlet and outlet passage are defined by using the temperature and heat transfer coefficients of all nodes of the cylinder wall surface, the fire surface and the air inlet and outlet passage area which are derived through a conversion software HTC-map module.
As an alternative embodiment, said determining the engine mechanical load comprises: and applying cylinder explosion pressure to the top surface of the finite element model of the piston, the land area and the fire surface of the cylinder cover in a surface load mode.
Specifically, the mechanical load is optionally calculated as follows: the wall surface of the cylinder hole is divided into a working medium contact area, a piston contact area, lubricating oil five and a crankcase air convection heat exchange area according to the position of the piston. The explosion pressure of the cylinder acts on the bottom of the cylinder cover and in a closed space formed by the combustion chamber and the working medium contact area, and the pressure is attenuated in the axial direction in the piston ring land area. And applying cylinder explosion pressure to the top surface of the piston finite element model, the land area and the thermal power surface of the cylinder cover in a surface load mode, and finally obtaining the distribution of thermal deformation of the engine matrix under the coupling effect of thermal load and mechanical load.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM (Read-Only Memory)/RAM (Random Access Memory ), magnetic disk, optical disc), including instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present application.
According to another aspect of the embodiments of the present application, there is also provided a diesel cylinder bore shape design system for implementing the above diesel cylinder bore shape design method, the system may include:
the working condition acquisition module is used for acquiring the rated working condition of the engine;
the deformation trend determining module is used for determining the deformation trend of the cylinder hole according to the rated working condition of the engine;
and the cylinder hole shape determining module is used for determining a novel cylinder hole shape according to the deformation trend of the cylinder hole.
It should be noted that the above modules are the same as examples and application scenarios implemented by the corresponding steps, but are not limited to what is disclosed in the above embodiments. It should be noted that, the above modules may be implemented in a hardware environment as part of the apparatus, and may be implemented by software, or may be implemented by hardware, where the hardware environment includes a network environment.
According to another aspect of the present application, there is provided an electronic device including:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the diesel engine cylinder bore shape design method.
Fig. 7 is a block diagram of an alternative electronic device, according to an embodiment of the present application, including a processor 202, a communication interface 204, a memory 206, and a communication bus 208, as shown in fig. 7, wherein the processor 202, the communication interface 204, and the memory 206 communicate with each other via the communication bus 208, wherein,
a memory 206 for storing a computer program;
the processor 202 is configured to execute the computer program stored in the memory 206, and implement the following steps:
acquiring the rated working condition of an engine;
determining the deformation trend of the cylinder hole according to the rated working condition of the engine;
and determining the shape of the novel cylinder hole according to the deformation trend of the cylinder hole.
As an alternative embodiment, in this embodiment, the above-described communication bus may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or an EISA (Extended Industry Standard Architecture ) bus, or the like. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, only one thick line is shown in fig. 7, but not only one bus or one type of bus.
The communication interface is used for communication between the electronic device and other devices.
The memory may include RAM or may include non-volatile memory (non-volatile memory), such as at least one disk memory. As an alternative embodiment, the memory may also be at least one memory device located remotely from the aforementioned processor.
The processor may be a general purpose processor and may include, but is not limited to: CPU (Central Processing Unit ), NP (Network Processor, network processor), etc.; but also DSP (Digital Signal Processing, digital signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable gate array) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
As an alternative embodiment, reference may be made to the examples described in the foregoing embodiments for specific examples in this embodiment, which are not described herein.
It will be understood by those skilled in the art that the structure shown in fig. 7 is only schematic, and the device implementing the method for designing the cylinder hole shape of the diesel engine may be a terminal device, and the terminal device may be a smart phone (such as an Android mobile phone, an IOS mobile phone, etc.), a tablet computer, a palm computer, a mobile internet device (Mobile Internet Devices, MID), a PAD, etc. Fig. 7 is not limited to the structure of the electronic device. For example, the terminal device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in fig. 7, or have a different configuration than shown in fig. 7.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device to execute in association with hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, etc.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, such as the division of the units, is merely a logical function division, and may be implemented in another manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in the present embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.
Claims (10)
1. A method for designing a shape of a cylinder bore of a diesel engine, comprising:
acquiring the rated working condition of an engine;
determining the deformation trend of the cylinder hole according to the rated working condition of the engine;
determining a novel cylinder hole shape according to the deformation trend of the cylinder hole;
wherein, the determining a novel cylinder hole shape according to the deformation trend of the cylinder hole includes:
reducing the aperture of a heated expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole;
and/or the number of the groups of groups,
and increasing the aperture of the non-thermal expansion area of the cylindrical cylinder hole according to the deformation trend of the cylinder hole.
2. The method for designing a cylinder bore shape of a diesel engine according to claim 1, wherein the novel cylinder bore shape is a shape in which the bore diameter gradually increases from one side to the other side.
3. The diesel engine cylinder bore shape design method of claim 1, wherein the engine nominal operation condition comprises: at rated power and rated rotational speed, the engine is under load, mechanical load and thermal load.
4. The diesel engine cylinder bore shape design method of claim 2, wherein the determining the deformation tendency of the cylinder bore according to the rated engine operating condition comprises:
determining an in-cylinder combustion process;
determining an engine thermal load from the in-cylinder combustion process;
determining an engine mechanical load;
and determining the deformation trend of the cylinder hole according to the engine thermal load and the engine mechanical load.
5. The diesel engine cylinder bore shape design method of claim 4, wherein the determining in-cylinder combustion process includes:
acquiring the temperature and heat transfer coefficient of the wall surface of the cylinder hole;
and determining an in-cylinder combustion calculation model according to the temperature of the wall surface of the cylinder hole and the heat transfer coefficient and the cylinder pressure curve.
6. The diesel engine cylinder bore shape design method of claim 4, wherein said determining an engine heat load from said in-cylinder combustion process comprises:
extracting a fluid domain grid model of an engine body and a cooling water jacket;
and determining the engine heat load according to the engine body and the cooling water jacket fluid domain grid model.
7. The diesel engine cylinder bore shape design method of claim 4, wherein the determining engine mechanical load comprises:
and applying cylinder explosion pressure to the top surface of the finite element model of the piston, the land area and the fire surface of the cylinder cover in a surface load mode.
8. A diesel engine cylinder bore shape design system, comprising:
the working condition acquisition module is used for acquiring the rated working condition of the engine;
the deformation trend determining module is used for determining the deformation trend of the cylinder hole according to the rated working condition of the engine;
and the cylinder hole shape determining module is used for determining a novel cylinder hole shape according to the deformation trend of the cylinder hole.
9. An electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus, characterized in that,
the memory is used for storing a computer program;
the processor is configured to execute the diesel engine cylinder bore shape design method steps of any one of claims 1 to 7 by running the computer program stored on the memory.
10. A computer-readable storage medium, characterized in that the storage medium has stored therein a computer program, wherein the computer program is arranged to execute the diesel engine cylinder bore shape design method steps of any one of claims 1 to 7 when run.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311566849.0A CN117272524B (en) | 2023-11-23 | 2023-11-23 | Diesel engine cylinder hole shape design method, system, electronic equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311566849.0A CN117272524B (en) | 2023-11-23 | 2023-11-23 | Diesel engine cylinder hole shape design method, system, electronic equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117272524A true CN117272524A (en) | 2023-12-22 |
| CN117272524B CN117272524B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311566849.0A Active CN117272524B (en) | 2023-11-23 | 2023-11-23 | Diesel engine cylinder hole shape design method, system, electronic equipment and storage medium |
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