A method for processing a cylinder head of a single-cylinder engine

Abstract

The present invention provides a method for processing a cylinder head of a single-cylinder engine, comprising the following steps: (1) rough machining the combustion chamber sealing surface of the component and fine machining the oil hole; (2) using the combustion chamber sealing surface downward as a bottom plane reference, using the oil hole as a positioning pin hole, and using a rotary table of a numerical control device to complete the processing of all angular dimensions of the component in all directions at one time, and fine machining is performed on the cooling water hole and the installation fitting surface; (3) using one side of the installation fitting surface downward as a bottom plane reference, using the cooling water hole as a positioning pin hole, and completing all dimensions of the combustion chamber sealing surface direction, the injection surface sealing surface direction and the injector hole of the component to the finished product size at one time. The processing method of the cylinder head of a single-cylinder engine described in the present invention can concentrate the process processing of the single-cylinder cylinder head component to the greatest extent, and effectively eliminate the repeated positioning error generated by repeated positioning between multiple processes.

Description

Technical Field

[0001] The invention belongs to the field of engines, and in particular relates to a method for processing a cylinder head of a single-cylinder engine. Background Art

[0002] The cylinder head of a certain scientific research model engine is a single-cylinder cylinder head. This component is a critical component in the engine. When the engine moves, it forms a combustion space with the piston and withstands the effects of high-temperature and high-pressure combustion gas. This component is a single cylinder head with a complex internal structure, multiple spatial angles, and a complex moving component with high multi-angle position accuracy. Since this type of component has multiple directional angles and the processing accuracy is very demanding, the processing steps required during the processing are long, there are many repeated positioning adjustments between the processes, and the cumulative error is large and uncontrollable. The parts qualification rate is only about 30%, and the qualified parts delivery rate is low. The production efficiency is extremely slow.

[0003] This research component is a key moving component in the engine. It is connected to many accessories in various directions and angles and has high dimensional accuracy. The traditional processing method is to process in a single direction and angle, which cannot realize multiple processes at the same time. The processing process is long, and the dimensions processed by the previous process are used as the reference between each process. Because the positioning reference during processing and clamping is clearance fit, the cumulative error becomes larger and larger, and the product processing consistency cannot be controlled. The axial dimensions of the key dimensions of the valve seat ring hole and the valve spring hole are not coaxial and misaligned. The processing accuracy is low, the adjustment and repeated positioning time between processes is long, the number of fixtures is long, the preparation time is long, and many equipment are involved, resulting in the inability to guarantee the processing size and form and position tolerances, the low product qualification rate, and the slow production and processing delays the production schedule. Summary of the invention

[0004] In view of this, the present invention aims to overcome the defects in the prior art and proposes a method for processing a cylinder head of a single-cylinder engine.

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

[0006] A method for processing a cylinder head of a single-cylinder engine comprises the following steps:

[0007] (1) Rough machining of the combustion chamber sealing surface of the parts and fine machining of the oil holes;

[0008] (2) With the combustion chamber sealing surface facing downward as the bottom plane reference, the oil hole is used as the positioning pin hole, and the rotary table of the CNC equipment is used to complete the processing of all angular dimensions of the component in all directions at one time, and the cooling water hole and the installation fitting surface are finely processed;

[0009] (3) With the mounting surface facing downward as the bottom plane reference, the cooling water hole is used as the positioning pin hole, and all dimensions of the combustion chamber sealing surface direction, the injection surface sealing surface direction and the injector hole of the component are completed to the finished product size at one time.

[0010] Furthermore, in the rough machining step in step (1), a 1mm margin is reserved for the size of the combustion chamber sealing surface from the finished product, and the flatness tolerance is controlled within 0.03mm.

[0011] Furthermore, the tolerance of the position, size and aperture of the oil hole in the finishing step in step (1) is controlled within 0.02 mm.

[0012] Furthermore, in the finishing step of the cooling water hole in step (2), the end surface dimensional accuracy of the cooling water hole is controlled within 0.02 mm.

[0013] Furthermore, in the step of finishing the mounting surface in step (2), the tolerance of the position, size and aperture of the mounting surface is controlled within 0.02 mm.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The processing method of the cylinder head of a single-cylinder engine described in the present invention integrates and merges processes while ensuring the process technology requirements of the product, and processes multiple processes into three processes. Key dimensions such as valve seat ring holes and sealing surfaces are processed at one time, eliminating repeated positioning errors between multiple processes, effectively ensuring processing dimensional accuracy, reducing process arrangements, improving product dimensional accuracy, reducing product scrap rate, and ensuring high-quality production.

[0016] The processing method of the single-cylinder engine cylinder head of the present invention can perform centralized process processing on the single-cylinder cylinder head parts to the greatest extent, effectively eliminate the repeated positioning error generated when repeated positioning between multiple processes, and the alignment error between processes, and can realize one-time clamping and processing for key processing dimensions. The size accuracy and position accuracy of the valve seat ring hole and the valve spring hole are improved to 0.02mm in one time, and the position accuracy and coaxiality of the injector hole to the combustion chamber surface are improved to 0.02mm, which ensures the quality of the product, improves the processing efficiency, reduces the production input cost of multiple sets of fixtures, ensures the progress of scientific research and production, improves the consistency of the size of finished parts, and improves the product qualification rate from 30% to more than 98%, and eliminates the preparation time between processes. The processing efficiency of a single product is shortened from 10 hours to 5 hours, and the processing efficiency is increased by about 2 times. It provides a reliable guarantee for scientific research and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A top perspective view of a cylinder head of a single-cylinder engine according to an embodiment of the present invention;

[0019] Figure 2 A bottom perspective view of a cylinder head of a single-cylinder engine according to an embodiment of the present invention;

[0020] Figure 3 A cross-sectional view of a fuel injector hole according to an embodiment of the present invention;

[0021] Figure 4 It is a cross-sectional view of the valve spring hole described in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1. Combustion chamber sealing surface; 2. Oil hole; 3. Cooling water hole; 4. Valve seat ring hole; 5. Installation fitting surface; 6. Spray face sealing surface; 7. Valve spring hole; 8. Exhaust sealing surface; 9. Injector hole. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] Example 1

[0029] A method for processing a cylinder head of a single-cylinder engine comprises the following steps:

[0030] (1) Rough machining is performed on the combustion chamber sealing surface of the component, and a 1mm margin is reserved for the size of the combustion chamber sealing surface from the finished product. The tolerance of flatness is controlled within 0.02mm. The oil hole is finely machined, and the tolerance of the position, size and aperture of the oil hole is controlled within 0.02mm;

[0031] (2) With the combustion chamber sealing surface facing downward as the bottom plane reference, the oil hole is used as the positioning pin hole, and the rotary table of the CNC equipment is used to complete the processing of all angular dimensions of the component in all directions at one time, and the cooling water hole and the mounting surface are finely processed. The end face dimensional accuracy of the cooling water hole is controlled within 0.02mm, and the position, size and hole diameter tolerance of the mounting surface are controlled within 0.02mm;

[0032] (3) With the mounting surface facing downward as the bottom plane reference, the cooling water hole is used as the positioning pin hole, and all dimensions of the combustion chamber sealing surface direction, the injection surface sealing surface direction and the injector hole of the component are completed to the finished product size at one time.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a cylinder head of a single-cylinder engine, characterized in that: The steps include: (1) Rough machining of the combustion chamber sealing surface of the parts and fine machining of the oil holes; (2) With the combustion chamber sealing surface facing downward as the bottom plane reference, the oil hole is used as the positioning pin hole, and the rotary table of the CNC equipment is used to complete the processing of all angular dimensions of the component in all directions at one time, and the cooling water hole and the installation fitting surface are finely processed; (3) With the installation fitting surface facing downward as the bottom plane reference, the cooling water hole is used as the positioning pin hole, and all dimensions of the combustion chamber sealing surface direction, the injection surface sealing surface direction and the injector hole of the component are completed to the finished product size at one time; In the rough machining step in step (1), a 1mm margin is reserved for the size of the combustion chamber sealing surface from the finished product, and the tolerance of the flatness is controlled within 0.03mm; The position, size and diameter tolerance of the oil hole in the finishing step in step (1) are controlled within 0.02 mm; In the step (2) of fine machining the cooling water hole, the end surface dimensional accuracy of the cooling water hole is controlled within 0.02 mm; In the step of finishing the mounting surface in step (2), the tolerance of the position, size and aperture of the mounting surface is controlled within 0.02 mm.

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