High-precision non-full-circumference valve outer circle edge collapse prevention grinding method

Abstract

The invention discloses a high-precision non-full-circumference valve outer circle edge collapse prevention grinding method which adopts a backward grinding mode. Grinding is conducted between the end, away from the second discontinuous annular outer circle grinding section, of the first discontinuous annular outer circle grinding section and the end, away from the first discontinuous annular outer circle grinding section, of the second discontinuous annular outer circle grinding section through a first grinding sleeve; the first grinding sleeve is sleeved with the second grinding sleeve until the first discontinuous annular outer circle grinding section and the second discontinuous annular outer circle grinding section are ground to the set requirement, and the length of the first grinding sleeve is smaller than that of the first discontinuous annular outer circle grinding section; and a backward grinding mode is adopted, a second grinding sleeve is used for grinding between the two ends of the non-complete circumferential outer circle grinding section till the non-complete circumferential outer circle grinding section is ground to meet the set requirement, and the length of the second grinding sleeve is smaller than the length of a complete circumferential section in the non-complete circumferential outer circle grinding section. The requirements for cylindricity, roughness and bright and clean sharp edges can be met at the same time, and then the performance and reliability of the aero-engine fuel regulator can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical hydraulic fuel regulator processing, and in particular relates to a high-precision non-full-circumference valve outer circle anti-collapse grinding method. Background Art

[0002] In the field of aviation engine technology, mechanical hydraulic fuel regulators play a vital role, and their performance directly affects the fuel supply efficiency and stability of the engine. As the core component of the regulator, precision parts are responsible for ensuring the accurate and stable transmission of hydraulic signals. They are not only used to provide a stable hydraulic pressure source, but also responsible for controlling the fuel flow pressure, and realizing the functions of hydraulic signal amplification and logic conversion control. Among these precision parts, the throttle switch, as a key valve component, is widely used in various fuel accessories of aviation engines. Its manufacturing accuracy and performance are directly related to the reliability of the entire fuel regulation system.

[0003] Specifically, the high-precision non-integral circumferential valve working surface is one of the core structures of the throttling switch. Its design feature is that the two ends are composed of multiple discontinuous annular outer circles. The cylindricality requirements of these outer circles are extremely high, reaching 0.001mm, and the surface roughness must be controlled within Ra0.025. What is more complicated is that there is a cavity on the middle working outer circle, forming a non-integral circumferential structure. The cylindricality requirement of this section of the outer circle is 0.002mm, and it also needs to meet the roughness requirement of Ra0.025. In addition, the outer diameter of this section of the working outer circle must also ensure that it is smaller than the discontinuous annular outer circles at both ends of the part (0.003~0.006)mm to meet specific functional requirements. More importantly, the intersection of the working outer circle and each end face must maintain a smooth and sharp edge to ensure the smooth transmission of hydraulic signals and the stability of the system.

[0004] Due to the extremely high precision requirements for the outer circle of this part, the traditional Tongyan processing method seems to be unable to cope with such stringent processing requirements. After the traditional method is used for processing, the non-full circumference outer circle and the intersection of the flat often collapse, which not only fails to meet the strict requirements of 0.002mm cylindricality, but also fails to guarantee the quality of the smooth and sharp edges. At the same time, the multiple intermittent annular outer circles at both ends of the working surface are also difficult to meet the precision standard of 0.001mm cylindricality. In addition, the surface of the parts is prone to scratches during the processing, resulting in the failure to meet the roughness requirement of Ra0.025. These problems jointly limit the application of traditional processing methods in the manufacturing of this type of precision parts, making it difficult to guarantee the processing quality of parts.

[0005] Therefore, in order to solve the problem of machining the working surface of high-precision non-circular valves, it is particularly important to develop a new machining method that can simultaneously meet the requirements of cylindricity, roughness, and smooth sharp edges. This is not only of great significance for improving the performance and reliability of aircraft engine fuel regulators, but also a key link in promoting the advancement of aircraft engine manufacturing technology. Summary of the invention

[0006] In response to the problems existing in the prior art, the present invention provides a high-precision non-circular valve outer circle anti-collapse grinding method, which can simultaneously meet the requirements of cylindricity, roughness and smooth and sharp edges, thereby helping to improve the performance and reliability of aircraft engine fuel regulators.

[0007] In order to solve the above technical problems, the present invention is implemented by the following technical solutions: A high-precision non-full circumference valve outer circle anti-collapse grinding method, the non-full circumference valve comprises a first discontinuous annular outer circle grinding section, a non-full circumference outer circle grinding section, a first non-grinding section and a second discontinuous annular outer circle grinding section connected in sequence, the non-full circumference outer circle grinding section comprises a complete circumference section, and the grinding method comprises: A retracting grinding method is adopted, wherein a first grinding sleeve is used to grind between an end of the first intermittent annular outer cylindrical grinding segment away from the second intermittent annular outer cylindrical grinding segment and an end of the second intermittent annular outer cylindrical grinding segment away from the first intermittent annular outer cylindrical grinding segment, until the first intermittent annular outer cylindrical grinding segment and the second intermittent annular outer cylindrical grinding segment are ground to a set requirement, wherein the length of the first grinding sleeve is less than the length of the first intermittent annular outer cylindrical grinding segment; A retract grinding method is adopted, and a second grinding sleeve is used to grind between the two ends of the non-full circumference outer circle grinding segment until the non-full circumference outer circle grinding segment is ground to a set requirement, wherein the length of the second grinding sleeve is less than the length of the complete circumference segment in the non-full circumference outer circle grinding segment.

[0008] Furthermore, the length of the first grinding sleeve is two-thirds of the length of the first discontinuous annular outer cylindrical grinding section.

[0009] Furthermore, the length of the second grinding sleeve is equal to the length of the complete circumference section in the non-full circumference outer circle grinding section.

[0010] Furthermore, when the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is used.

[0011] Furthermore, when the second grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W10 or W7 is used.

[0012] Furthermore, the non-full circumference valve further comprises a second non-grinding section connected to an end of the first discontinuous annular outer circle grinding section away from the second discontinuous annular outer circle grinding section; the grinding method further comprises: Before starting grinding, the second non-grinding section is clamped on a fixture.

[0013] Furthermore, the clamp adopts a tension spring type chuck.

[0014] Furthermore, the grinding method also includes: Before starting grinding, clean the non-full circle valve.

[0015] Furthermore, the grinding method also includes: Before starting grinding, the first grinding sleeve and the second grinding sleeve are cleaned.

[0016] Furthermore, the length of the second discontinuous annular outer cylindrical grinding section is smaller than the length of the first discontinuous annular outer cylindrical grinding section.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention provides a high-precision non-full circumference valve outer circle anti-collapse grinding method, wherein the length of the first grinding sleeve is less than the length of the first intermittent annular outer circle grinding section, so as to avoid excessive contact between the grinding sleeve and the intersection of the annular groove and the end face of the intermittent annular outer circle grinding section during the grinding process, thereby reducing the cutting amount in this area and preventing the generation of collapsed edges. During grinding, a retreat grinding method is adopted, that is, grinding is started from one end of the first intermittent annular outer circle grinding section away from the second intermittent annular outer circle grinding section. When grinding to the non-full circumference outer circle grinding section, the first grinding sleeve becomes loose, and the distribution of the grinding paste on the surface of the part is more uniform, thereby avoiding excessive extrusion of the grinding paste at the edge where the cavity and the outer circle of the non-full circumference outer circle grinding section intersect, thereby achieving uniform removal of the excess and effectively preventing the formation of collapsed edges. After the grinding of the first intermittent annular outer circle grinding section and the second intermittent annular outer circle grinding section is completed, the grinding of the non-full circumference outer circle grinding section is carried out. At this time, a second grinding sleeve with a length less than the length of the complete circumference section in the non-full circumference outer circle grinding section is used. During grinding, the same retreat grinding method is adopted, but at this time the second grinding sleeve is clamped at the complete circumference segment, and then processed from the complete circumference segment to the non-complete circumference outer circle. This grinding method ensures that the second grinding sleeve removes the maximum amount of excess during the first cutting. When grinding to the non-complete circumference outer circle, the grinding sleeve becomes loose, and the removal of excess becomes more uniform, thereby avoiding the risk of edge collapse caused by too fast cutting at the edge where the non-complete circumference outer circle intersects with the cavity. In summary, the present invention can simultaneously meet the requirements of cylindricity, roughness, and smooth and sharp edges, which is beneficial to improving the performance and reliability of aircraft engine fuel regulators.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a flow chart of a method for high-precision non-full-circumference valve outer circle anti-collapse grinding according to an embodiment of the present invention; Figure 2 This is an axonometric diagram of a high-precision non-full-circumference valve according to an embodiment of the present invention; Figure 3 It is a front view of a high-precision non-full-circumference valve according to an embodiment of the present invention; Figure 4 The schematic cross-sectional view of a grinding sleeve in a high-precision non-circumferential valve outer circle anti-collapse grinding method according to an embodiment of the present invention.

[0021] In the figure: 1-first discontinuous annular outer cylindrical grinding section; 2-non-full circumference outer cylindrical grinding section; 3-first non-grinding section; 4-second discontinuous annular outer cylindrical grinding section; 5-second non-grinding section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Combination Figure 2 and Figure 3 As shown, the non-full circumference valve includes a first discontinuous annular outer cylindrical grinding segment 1, a non-full circumference outer cylindrical grinding segment 2, a first non-grinding segment 3 and a second discontinuous annular outer cylindrical grinding segment 4 connected in sequence, wherein the non-full circumference outer cylindrical grinding segment 2 includes a complete circumference segment.

[0024] like Figure 1As shown, a high-precision non-circumferential valve outer circle anti-collapse grinding method according to an embodiment of the present invention is intended to solve the problems of collapsing edges, substandard cylindricity, substandard roughness, and poor quality of smooth and sharp edges when processing the working surface of high-precision non-circumferential valves using traditional processing methods. The method achieves high-precision grinding of the first discontinuous annular outer circle grinding section, the non-circumferential outer circle grinding section, and the second discontinuous annular outer circle grinding section by controlling the length of the grinding sleeve and the grinding method. The specific method is as follows: Step 1, adopting the retreat grinding method, using the first grinding sleeve to grind (i.e., through grinding) between the end of the first intermittent annular outer cylindrical grinding segment 1 away from the second intermittent annular outer cylindrical grinding segment 4 and the end of the second intermittent annular outer cylindrical grinding segment 4 away from the first intermittent annular outer cylindrical grinding segment 1, until the first intermittent annular outer cylindrical grinding segment 1 and the second intermittent annular outer cylindrical grinding segment 4 are ground to the set requirements, wherein the length of the first grinding sleeve is less than the length of the first intermittent annular outer cylindrical grinding segment 1.

[0025] That is to say, first, prepare a first grinding sleeve whose length is less than the length of the first intermittent annular outer cylindrical grinding section 1. This design is to avoid excessive contact between the grinding sleeve and the intersection of the annular groove and the end face of the intermittent annular outer cylindrical grinding section during the grinding process, thereby reducing the amount of cutting in this area and preventing the generation of collapsed edges. During grinding, a retreat grinding method is adopted, that is, grinding is started from the end of the first intermittent annular outer cylindrical grinding section 1 away from the second intermittent annular outer cylindrical grinding section 4, and gradually advances to the middle until the set requirements are met. In this process, the grinding paste needs to be applied evenly to ensure the consistency of the grinding effect. When grinding to the non-full circumference outer cylindrical grinding section 2, since the first grinding sleeve becomes loose, the distribution of the grinding paste on the surface of the part is more even, avoiding excessive extrusion of the grinding paste at the edge where the cavity of the non-full circumference outer cylindrical grinding section 2 intersects with the outer circle, thereby achieving uniform removal of the excess and effectively preventing the formation of collapsed edges.

[0026] Step 2, adopting the retreat grinding method, using the second grinding sleeve to grind between the two ends of the non-full circumference outer circle grinding segment 2 until the non-full circumference outer circle grinding segment 2 is ground to the set requirements, wherein the length of the second grinding sleeve is less than the length of the complete circumference segment in the non-full circumference outer circle grinding segment 2.

[0027] That is to say, after the grinding of the first intermittent annular outer circle grinding section 1 and the second intermittent annular outer circle grinding section 4 is completed, the grinding of the non-full circumference outer circle grinding section 2 is carried out. At this time, a second grinding sleeve whose length is less than the length of the complete circumference section in the non-full circumference outer circle grinding section 2 is used. During grinding, the same retreat grinding method is used, but at this time the second grinding sleeve is clamped at the complete circumference section, and then processed from the complete circumference section to the non-full circumference outer circle. This grinding method ensures that the second grinding sleeve removes the maximum amount of excess during the first cutting. When grinding to the non-full circumference outer circle, the grinding sleeve becomes loose, and the removal of the excess becomes more uniform, thereby avoiding the risk of edge collapse caused by cutting too fast at the edge where the non-full circumference outer circle intersects with the cavity.

[0028] More specifically, the length of the first grinding sleeve is smaller than the length of the first intermittent annular outer cylindrical grinding segment 1. When grinding is performed between an end of the first intermittent annular outer cylindrical grinding segment 1 away from the second intermittent annular outer cylindrical grinding segment 4 and an end of the second intermittent annular outer cylindrical grinding segment 4 away from the first intermittent annular outer cylindrical grinding segment 1, if the first grinding sleeve is too long, both ends of the first grinding sleeve frequently contact the intermittent annular outer cylindrical grinding segment, and the cutting amount there is the largest, which can easily lead to a collapsed edge at the intersection of the annular groove and the end face of the intermittent annular outer cylindrical grinding segment. Tongyan adopts a grinding method of first retreating and then advancing. It starts grinding from the first grinding sleeve at the end of the first intermittent annular outer cylindrical grinding section 1 away from the second intermittent annular outer cylindrical grinding section 4. At this time, the grinding paste is relatively unevenly distributed. When the non-full circumference outer cylindrical grinding section 2 is ground, the first grinding sleeve becomes loose, and the grinding paste is applied more evenly on the surface of the part, which will not cause the grinding paste to be squeezed on the edge where the cavity and the outer circle of the non-full circumference outer cylindrical grinding section 2 intersect, thereby achieving relatively uniform removal of the excess. This method can effectively avoid the collapse of the three edges where the outer circle of the non-full circumference outer cylindrical grinding section 2 intersects with the cavity due to large cutting allowance; if the first grinding sleeve is too long, it will also cause the cone ellipse and straightness of the cylindricity of the part to be out of tolerance.

[0029] The length of the second grinding sleeve is designed and manufactured to be smaller than the length of the complete circumference section in the non-full circumference outer circle grinding section 2. When grinding the non-full circumference outer circle grinding section 2, for example, the second grinding sleeve is clamped at the complete circumference section, and then processed from the complete circumference section to the non-full circumference outer circle direction (that is, the method of retreating first and advancing later), and the second grinding sleeve is clamped at the point where the removal of the excess is the largest during the first cutting. When grinding to the non-full circumference outer circle, the grinding sleeve becomes loose, and the removal of the excess is relatively uniform. This method can effectively avoid the three edges where the non-full circumference outer circle intersects with the cavity and form collapsed edges due to rapid cutting.

[0030] It should be understood that after grinding, the parts need to be inspected, including quality inspection of cylindricity, roughness, and smooth sharp edges. High-precision inspection equipment such as coordinate measuring machines can be used for measurement to ensure that the processing quality of the parts meets the design requirements.

[0031] The high-precision non-circular valve outer circle anti-collapse grinding method of this embodiment achieves high-precision grinding of the working surface of the high-precision non-circular valve by controlling the length of the grinding sleeve and the grinding method, and effectively solves the problems of edge collapse, substandard cylindricity, unsatisfactory roughness and poor quality of smooth and sharp edges existing in traditional processing methods.

[0032] In an achievable manner, the length of the first grinding sleeve is two-thirds of the length of the first discontinuous annular outer cylindrical grinding segment 1 .

[0033] Specifically, the length of the first grinding sleeve is designed to be two-thirds of the length of the first discontinuous annular outer cylindrical grinding section 1. This design not only avoids the risk of edge collapse caused by the grinding sleeve being too long, but also ensures the stability of the grinding sleeve when held in the hand, thereby ensuring the accuracy of the part size. If the grinding sleeve is too short, it is easy to shake when held in the hand, affecting the grinding accuracy and the dimensional stability of the part.

[0034] In an achievable manner, the length of the second grinding sleeve is equal to the length of the complete circumference segment in the non-full circumference outer circle grinding segment 2 .

[0035] Specifically, the length of the second grinding sleeve is equal to the length of the complete circumferential section in the non-full circumferential outer circle grinding section 2. Since the length of the grinding sleeve is equal to the length of the complete circumferential section in the non-full circumferential outer circle grinding section 2, the grinding sleeve can naturally become loose when grinding to the non-full circumferential outer circle, thereby avoiding excessive cutting force at the edge and effectively preventing the generation of collapsed edges. When grinding the non-full circumferential outer circle grinding section 2, the second grinding sleeve is clamped at the complete circumferential section, and then processed from the complete circumferential section to the non-full circumferential outer circle. This grinding method ensures that the grinding sleeve removes the maximum amount of excess during the first cutting. When grinding to the non-full circumferential outer circle, the grinding sleeve becomes loose, and the excess removal becomes more uniform, thereby avoiding the risk of collapsed edges.

[0036] In one achievable manner, when the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is used.

[0037] That is to say, when the first grinding sleeve is used for grinding, a white corundum grinding paste with a particle size of W14 or W10 is used. White corundum grinding paste is suitable for grinding high-precision parts due to its high hardness, good wear resistance, strong cutting force and other characteristics. When grinding the outer circle, if the grinding paste is too coarse, it is easy to cut too much material per unit time; if the grinding paste is too fine, the cutting speed is slow, and it is easy to scratch the surface of the part during grinding. The grinding paste with a particle size of W14 is suitable for preliminary grinding and can quickly remove the excess on the surface of the part; the grinding paste with a particle size of W10 is suitable for fine grinding, which can further refine the surface of the part and improve the finish and roughness. The use of white corundum grinding paste with a particle size of W14 or W10 for grinding not only achieves high-precision grinding of the working surface of high-precision non-full-circle valves, but also effectively solves the problems of collapsed edge, substandard cylindricity, substandard roughness, and poor quality of smooth and sharp edges in traditional processing methods.

[0038] In one achievable manner, when the second grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W10 or W7 is used.

[0039] Specifically, when the second grinding sleeve is used for grinding, a white corundum grinding paste with a particle size of W10 or W7 is used. W10 particle size is used for fine grinding to further refine the surface and improve the smoothness and roughness; W7 particle size is used for super fine grinding to achieve extremely high surface quality. Using a white corundum grinding paste with a particle size of W10 or W7 can further improve the smoothness and roughness of the part surface.

[0040] In one achievable embodiment, the non-full-circumferential valve further includes a second non-grinding segment 5 connected to an end of the first intermittent annular outer cylindrical grinding segment 1 away from the second intermittent annular outer cylindrical grinding segment 4; the grinding method further includes: before starting grinding, clamping the second non-grinding segment 5 on a fixture.

[0041] That is, the non-full-circumference valve also includes a second non-grinding section connected to an end of the first discontinuous annular outer cylindrical grinding section away from the second discontinuous annular outer cylindrical grinding section. The presence of the second non-grinding section provides a stable clamping point for the grinding process, and before starting the grinding, the second non-grinding section is clamped on the fixture. The fixture should be designed to ensure that the non-grinding section can be firmly clamped while avoiding any impact on the grinding section. Clamping the non-grinding section helps to maintain the stability of the valve during the grinding process and prevent the grinding quality from being reduced due to vibration or deformation.

[0042] Preferably, the clamp adopts a spring-tension chuck. Specifically, the grinding lathe uses a three-jaw chuck to clamp the parts, which is a three-point force. The entire outer circle of the part is unevenly stressed, and the outer circle jumps out greatly. If the clamping force is too large, the parts may be clamped or deformed. This embodiment uses a spring-tension chuck to clamp the parts. The spring-tension chuck can tightly clamp workpieces of different diameters through its internal spring structure to ensure that the workpiece will not be affected by vibration or deformation during the grinding process. The parts are evenly stressed, avoiding problems such as clamping and deformation, and the jump is small and easy to correct. At the same time, the spring-tension chuck is easy to operate, can quickly clamp and disassemble the workpiece, and improves the grinding efficiency.

[0043] In one achievable embodiment, the grinding method further comprises: before starting the grinding, cleaning the non-full-circumference valve.

[0044] Specifically, before starting grinding, the non-full-circle valve is cleaned to remove oil, dust and impurities on the workpiece surface, ensuring that the grinding paste can act evenly and effectively on the workpiece surface, thereby improving grinding efficiency and quality.

[0045] In one achievable manner, the grinding method further includes: before starting the grinding, cleaning the first grinding sleeve and the second grinding sleeve.

[0046] Specifically, the first grinding sleeve and the second grinding sleeve are cleaned to remove oil stains, grinding paste residues and other impurities on the surfaces of the grinding sleeves, to ensure that the surfaces of the grinding sleeves are clean, and to avoid the grinding quality and efficiency being affected by impurities during the grinding process.

[0047] In this embodiment, the length of the second discontinuous annular outer cylindrical grinding segment 4 is smaller than the length of the first discontinuous annular outer cylindrical grinding segment 1 .

[0048] For example, Figure 3 As shown in the figure, the working surface of the high-precision non-integer circumference valve is composed of several discontinuous annular outer circles at both ends. The cylindricity of the outer circle is 0.001 mm and the roughness is Ra0.025. There is a cavity on the middle working outer circle, which is a non-integer circumference outer circle. The cylindricity of this section of the outer circle is 0.002 mm and the roughness is Ra0.025. The size of this section of the outer circle is required to be smaller than the discontinuous annular outer circle at both ends of the part (0.003~0.006) mm; the intersection of the working outer circle and each end face is required to maintain a smooth and sharp edge. Due to the very high outer circle accuracy of the part, after the traditional through-research method is used for processing, there is a collapsed edge at the intersection of the non-integer circumference outer circle and the cavity, which cannot meet the requirements of cylindricity of 0.002 mm and smooth and sharp edges; the several discontinuous annular outer circles at both ends of the working surface cannot meet the requirements of cylindricity of 0.001 mm and smooth and sharp edges; at the same time, there are scratches on the surface of the part, which cannot meet the requirements of roughness Ra0.025. Therefore, it is difficult to ensure the processing quality of parts processed by traditional Tongyan method.

[0049] like Figure 3 As shown, the high-precision non-full-circumference valve outer circle anti-collapse grinding method of this embodiment is described in detail as follows: 1) The material of the part is alloy structural steel 16Cr2MnTiA, the outer circle hardness is HRC58~64, the center hardness is HRC≤40, and the outer circle allowance is (0.01~0.015) mm; 2) Make two grinding sleeves. The length of the first grinding sleeve is 2 / 3 of the length of the B section of the part, which is used for grinding the part; the length of the second grinding sleeve is the length of the L section of the part minus the length of the non-full circumference outer circle, which is used for grinding the non-full circumference outer circle grinding section 2; 3) When making the grinding sleeve, install it on the grinding head, use a file to file the inlet and opening of the grinding sleeve, remove the grinding sleeve from the grinding head, install the filed end on the grinding head, and use a file to file the inlet of the other end of the grinding sleeve; ensure that there are no edges and burrs at the inlet and opening of the grinding sleeve to prevent scratching the outer circle of the part; 4) Clean the grinding sleeve to prevent metal chips from remaining inside the grinding sleeve when grinding the outer circle and scratching the outer circle of the part; 5) Clean the parts to prevent metal chips or foreign objects from scratching the outer circle when grinding the outer circle; 6) The second non-grinding section 5 (non-processing end) of the part is installed on the spring-loaded chuck of the grinding head. The first grinding sleeve passes through the part. The first grinding sleeve is clamped at the annular circumference at the leftmost end of the working surface to grind the part. W14 or W10 grinding paste is evenly applied on the working outer circle. The part is ground by retreating and advancing. A margin of (0.004-0.006) mm is left for the middle non-full circumference outer circle segment. The outer circle with discontinuous annular circumference on the left and right ends is processed to a cylindrical degree of 0.001 mm, a smooth sharp edge and a roughness of Ra0.025. Local point tolerance is allowed; 7) The second grinding sleeve passes through the part and is clamped at the complete outer circle of the non-full circumference outer circle grinding section 2. This section uses W10 or W7 grinding paste and adopts the retreat and advance grinding method to ensure its cylindricality of 0.002 mm, smooth sharp edges and roughness Ra0.025 requirements; 8) When there is a local point deviation in the cylindricity of a certain section of the outer circle of the part, the second grinding sleeve is clamped at the outer circle, and the W10 or W7 grinding paste is used to grind in a retreat and advance manner to ensure the relevant requirements.

[0050] Since the intersection of the non-full circumference outer circle and the cavity requires a smooth and sharp edge, when the grinding allowance is large, during the grinding process, the grinding paste cuts the allowance quickly at the three edges where the non-full circumference outer circle and the cavity intersect, which easily leads to the collapse of the three edges where the non-full circumference outer circle and the cavity intersect. Therefore, after many tests and verifications, it is more appropriate to leave a (0.01-0.015) mm allowance for grinding the outer circle in the previous process, and a (0.004-0.006) mm allowance for grinding the outer circle in the segmented process.

[0051] In this embodiment, the length of the first grinding sleeve is 14 mm, and the length of the second grinding sleeve is 6 mm.

[0052] The processing method involved in this embodiment has been verified on site with multiple high-precision non-circular valve parts. It can directly leave appropriate processing allowance for grinding the outer circle of high-precision non-circular valve parts, adopt a combination of through grinding and segmented grinding, change the clamping position and grinding direction of the grinding sleeve, and use appropriate grinding paste to ensure the cylindricity, smooth sharp edges and roughness of the parts. The method is simple to operate and has no implementation difficulties. It can effectively ensure the processing quality and efficiency of parts. At the same time, the method is easy to use on the production site and is applied to the processing of all high-precision non-circular valve parts, which improves the processing efficiency and qualification rate of parts, meets the needs of timely delivery of parts, and provides experience for the processing of such non-circular valves.

[0053] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations 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 a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-precision non-circumferential valve outer circle anti-collapse grinding method, characterized in that: The non-full circumference valve comprises a first discontinuous annular outer circumference grinding segment (1), a non-full circumference outer circumference grinding segment (2), a first non-grinding segment (3) and a second discontinuous annular outer circumference grinding segment (4) connected in sequence, wherein the non-full circumference outer circumference grinding segment (2) comprises a complete circumference segment, and the grinding method comprises: A retracting grinding method is adopted, wherein a first grinding sleeve is used to grind between an end of the first intermittent annular outer cylindrical grinding section (1) away from the second intermittent annular outer cylindrical grinding section (4) and an end of the second intermittent annular outer cylindrical grinding section (4) away from the first intermittent annular outer cylindrical grinding section (1), until the first intermittent annular outer cylindrical grinding section (1) and the second intermittent annular outer cylindrical grinding section (4) are ground to a set requirement, wherein the length of the first grinding sleeve is less than the length of the first intermittent annular outer cylindrical grinding section (1); A retracting grinding method is adopted, wherein a second grinding sleeve is used to grind between the two ends of the non-full circumference outer circle grinding section (2) until the non-full circumference outer circle grinding section (2) is ground to a set requirement, wherein the length of the second grinding sleeve is less than the length of the complete circumference section in the non-full circumference outer circle grinding section (2).

2. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: The length of the first grinding sleeve is two thirds of the length of the first discontinuous annular outer cylindrical grinding section (1).

3. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: The length of the second grinding sleeve is equal to the length of the complete circumference section in the non-complete circumference outer circle grinding section (2).

4. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: When the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is used.

5. The high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1 is characterized in that: When the second grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W10 or W7 is used.

6. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: The non-full circumferential valve further comprises a second non-grinding section (5) connected to an end of the first discontinuous annular outer cylindrical grinding section (1) away from the second discontinuous annular outer cylindrical grinding section (4); The grinding method also includes: Before starting grinding, the second non-grinding section (5) is clamped on a fixture.

7. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 6, characterized in that: The clamp adopts a tension spring type chuck.

8. The high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1 is characterized in that: The grinding method also includes: Before starting grinding, clean the non-full circle valve.

9. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: The grinding method also includes: Before starting grinding, the first grinding sleeve and the second grinding sleeve are cleaned.

10. A high-precision non-full-circumference valve outer circle anti-collapse grinding method according to claim 1, characterized in that: The length of the second discontinuous annular outer cylindrical grinding segment (4) is smaller than the length of the first discontinuous annular outer cylindrical grinding segment (1).

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