A high-precision non-circular outer circle collapse-proof grinding method for a valve

Abstract

The application discloses a high-precision non-integer circumference valve outer circle anti-collapse edge grinding method, adopts a retreat grinding mode, utilizes a first grinding sleeve to grind between one end of a first intermittent annular outer circle grinding section away from a second intermittent annular outer circle grinding section and one end of the second intermittent annular outer circle grinding section away from the first intermittent annular outer circle grinding section until the first intermittent annular outer circle grinding section and the second intermittent annular outer circle grinding section are ground to a set requirement, wherein the length of the first grinding sleeve is smaller than the length of the first intermittent annular outer circle grinding section; the retreat grinding mode is adopted, a second grinding sleeve is utilized to grind between two ends of the non-integer circumference outer circle grinding section until the non-integer circumference outer circle grinding section is ground to a set requirement, wherein the length of the second grinding sleeve is smaller than the length of a complete circumference section in the non-integer circumference outer circle grinding section. The application can simultaneously meet the requirements of the cylindrical degree, the roughness and the smooth sharp edge, and is favorable for improving the performance and reliability of an aero-engine fuel regulator.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical hydraulic fuel regulator processing, and particularly relates to a high-precision non-integer circle valve outer circle anti-collapse edge grinding method. BACKGROUND

[0002] In the field of aero-engine technology, a mechanical hydraulic fuel regulator plays a vital role, and its performance directly affects the fuel supply efficiency and stability of the engine. As the core component of the regulator, precision couplings bear the heavy responsibility of ensuring the accurate and stable transmission of hydraulic signals. They not only provide a stable hydraulic pressure source, but also control fuel flow pressure, and realize functions such as hydraulic signal amplification and logic conversion control. Among these precision couplings, the throttle switch, as a key valve component, is widely used in various fuel accessories of aero-engines, and its manufacturing precision and performance are directly related to the reliability of the entire fuel regulating system.

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

[0004] Due to the high precision requirement of the outer circle of this part, the traditional through-research processing method is not up to the task when faced with such stringent processing requirements. After processing by traditional methods, the non-integer circle outer circle and the flat intersection often appear to be collapsed, which not only cannot meet the strict requirement of 0.002 mm cylindricality, but also cannot guarantee the quality of smooth sharp edges. At the same time, the multiple discontinuous annular outer circles at both ends of the working surface are also difficult to meet the precision standard of 0.001 mm cylindricality. In addition, the surface of the part is easily scratched during processing, which makes it impossible to meet the roughness requirement of Ra0.025. These problems together limit the application of traditional processing methods in the manufacturing of this type of precision coupling, making it difficult to guarantee the processing quality of the part.

[0005] Therefore, in view of the machining problem of the high-precision non-integer circumference valve working surface, it is particularly important to develop a new machining method which can meet the requirements of cylindricity, roughness and smooth sharp edge at the same time. This not only has great significance for improving the performance and reliability of the aircraft engine fuel regulator, but also is a key link to promote the progress of aircraft engine manufacturing technology. SUMMARY

[0006] In view of the problems in the prior art, the application provides a high-precision non-integer circumference valve outer circle anti-collapse edge grinding method, which can meet the requirements of cylindricity, roughness and smooth sharp edge at the same time, thereby being beneficial to improving the performance and reliability of the aircraft engine fuel regulator.

[0007] In order to solve the above technical problems, the application is implemented by the following technical scheme:

[0008] A high-precision non-integer circumference valve outer circle anti-collapse edge grinding method, the non-integer circumference valve comprises a first discontinuous annular outer circle grinding section, a non-integer circumference outer circle grinding section, a first non-grinding section and a second discontinuous annular outer circle grinding section connected in sequence, the non-integer circumference outer circle grinding section contains a complete circumference section, and the grinding method comprises:

[0009] The first grinding sleeve is used to grind between one end of the first discontinuous annular outer circle grinding section away from the second discontinuous annular outer circle grinding section and one end of the second discontinuous annular outer circle grinding section away from the first discontinuous annular outer circle grinding section in a retreat grinding mode until the first discontinuous annular outer circle grinding section and the second discontinuous annular outer circle grinding section are ground to the set requirement, wherein the length of the first grinding sleeve is less than the length of the first discontinuous annular outer circle grinding section;

[0010] The second grinding sleeve is used to grind between two ends of the non-integer circumference outer circle grinding section in a retreat grinding mode until the non-integer circumference outer circle grinding section is ground to the set requirement, wherein the length of the second grinding sleeve is less than the length of the complete circumference section in the non-integer circumference outer circle grinding section.

[0011] Further, the length of the first grinding sleeve is two-thirds of the length of the first discontinuous annular outer circle grinding section.

[0012] Further, the length of the second grinding sleeve is equal to the length of the complete circumference section in the non-integer circumference outer circle grinding section.

[0013] Further, when the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is adopted.

[0014] Further, when the second grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W10 or W7 is adopted.

[0015] Further, the non-integer circumference valve further comprises a second non-grinding section connected to one end of the first intermittent annular outer circle grinding section away from the second intermittent annular outer circle grinding section; the grinding method further comprises:

[0016] Before starting grinding, the second non-grinding section is clamped on a clamp.

[0017] Further, the clamp adopts a bellows chuck.

[0018] Further, the grinding method further comprises:

[0019] Before starting grinding, the non-integer circumference valve is subjected to cleaning treatment.

[0020] Further, the grinding method further comprises:

[0021] Before starting grinding, the first grinding sleeve and the second grinding sleeve are subjected to cleaning treatment.

[0022] Further, the length of the second intermittent annular outer circle grinding section is less than the length of the first intermittent annular outer circle grinding section.

[0023] Compared with the prior art, the present application has at least the following beneficial effects:

[0024] The application provides a high-precision non-integer circumference valve outer circle anti-collapse grinding method, the length of the first grinding sleeve is smaller than the length of the first intermittent annular outer circle grinding section, so that excessive contact is avoided between the annular groove and the end surface of the intermittent annular outer circle grinding section during grinding of the grinding sleeve, the cutting amount of the region is reduced, and the generation of collapse is prevented. During grinding, the grinding is performed in a retreat and advance manner, that is, the 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, and when the grinding reaches the non-integer circumference outer circle grinding section, the first grinding sleeve is loosened, the distribution of the grinding paste on the surface of the part is more uniform, excessive extrusion of the grinding paste at the edge where the cavity of the non-integer circumference outer circle grinding section intersects with the outer circle is avoided, and the uniformity of the removal of the excess amount is realized, so that the formation of collapse is effectively prevented. 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-integer circumference outer circle grinding section is performed. At this time, the second grinding sleeve with a length smaller than the length of the complete circumference section in the non-integer circumference outer circle grinding section is used. During grinding, the grinding is also performed in a retreat and advance manner, but at this time, the second grinding sleeve is clamped at the complete circumference section, and then the machining is performed from the complete circumference section to the non-integer circumference outer circle direction. This grinding manner ensures that the second grinding sleeve removes the maximum excess amount during the first cutting, and when the grinding reaches the non-integer circumference outer circle, the removal of the excess amount becomes more uniform due to loosening of the grinding sleeve, so that the risk of collapse caused by too fast cutting at the edge where the non-integer circumference outer circle intersects with the cavity is avoided. In summary, the application can simultaneously meet the requirements of cylindricity, roughness and sharp edge finishing, and thus is favorable for improving the performance and reliability of an aero-engine fuel regulator.

[0025] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 The flow chart of the high-precision non-integer circumference valve outer circle anti-collapse grinding method of the embodiment of the present application;

[0028] Figure 2 The axonometric view of the high-precision non-integer circumference valve of the embodiment of the present application;

[0029] Figure 3 The front view of the high-precision non-integer circumference valve of the embodiment of the present application;

[0030] Figure 4 It is a high-precision non-circular outer circle grinding method for preventing edge collapse of the outer circle of the valve.

[0031] In the figure: 1-first discontinuous annular outer circle grinding section; 2-non-circular outer circle grinding section; 3-first non-grinding section; 4-second discontinuous annular outer circle grinding section; 5-second non-grinding section. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In conjunction with Figure 2 and Figure 3 As shown, the non-circular outer circle valve comprises a first discontinuous annular outer circle grinding section 1, a non-circular outer circle grinding section 2, a first non-grinding section 3 and a second discontinuous annular outer circle grinding section 4 connected in sequence, and the non-circular outer circle grinding section 2 contains a complete circle section.

[0034] As Figure 1 shown, the high-precision non-circular outer circle grinding method for preventing edge collapse of the valve of the embodiments of the present application aims to solve the problems of edge collapse, non-standard cylindricality, non-satisfactory roughness and poor quality of sharp edges in the processing of high-precision non-circular outer circle valves by traditional processing methods. By controlling the length and grinding method of the grinding sleeve, high-precision grinding of the first discontinuous annular outer circle grinding section, the non-circular outer circle grinding section and the second discontinuous annular outer circle grinding section is achieved. The specific method is as follows:

[0035] Step 1, using the retreat grinding method, using the first grinding sleeve to grind (i.e. through grinding) between the end of the first discontinuous annular outer circle grinding section 1 away from the second discontinuous annular outer circle grinding section 4 and the end of the second discontinuous annular outer circle grinding section 4 away from the first discontinuous annular outer circle grinding section 1 until the first discontinuous annular outer circle grinding section 1 and the second discontinuous annular outer circle grinding section 4 are ground to the specified requirements, wherein the length of the first grinding sleeve is less than the length of the first discontinuous annular outer circle grinding section 1.

[0036] That is, first, a first grinding sleeve with a length less than the length of the first discontinuous annular outer circle grinding segment 1 is prepared. This design is to avoid excessive contact between the grinding sleeve and the intersection of the annular groove and the end face of the discontinuous annular outer circle grinding segment during grinding, thereby reducing the cutting amount of this area and preventing the formation of collapse. During grinding, the grinding is performed in a retreat grinding mode, that is, the grinding starts from the end of the first discontinuous annular outer circle grinding segment 1 away from the second discontinuous annular outer circle grinding segment 4, and gradually advances to the middle until the required setting is reached. During this process, the application of the grinding paste needs to be uniform to ensure the consistency of the grinding effect. When grinding to the non-integer circle outer circle grinding segment 2, the grinding paste is more evenly distributed on the surface of the part due to the loosening of the first grinding sleeve, which avoids excessive extrusion of the grinding paste at the edge of the intersection of the cavity and the outer circle of the non-integer circle outer circle grinding segment 2, thereby achieving uniform removal of excess amount and effectively preventing the formation of collapse.

[0037] Step 2, using a retreat grinding mode, the second grinding sleeve is used to grind between the two ends of the non-integer circle outer circle grinding segment 2 until the non-integer circle outer circle grinding segment 2 is ground to the required setting, wherein the length of the second grinding sleeve is less than the length of the complete circle segment in the non-integer circle outer circle grinding segment 2.

[0038] That is, after the grinding of the first discontinuous annular outer circle grinding segment 1 and the second discontinuous annular outer circle grinding segment 4 is completed, the grinding of the non-integer circle outer circle grinding segment 2 is performed. At this time, a second grinding sleeve with a length less than the length of the complete circle segment in the non-integer circle outer circle grinding segment 2 is used. During grinding, the retreat grinding mode is also used, but at this time the second grinding sleeve is clamped at the complete circle segment, and then the complete circle segment is machined towards the non-integer circle outer circle. This grinding method ensures that the second grinding sleeve removes the maximum amount of excess material during the first cutting, and when the non-integer circle outer circle is ground, the grinding sleeve becomes loose, the removal of excess material becomes more uniform, thereby avoiding the risk of collapse caused by excessive cutting at the edge of the intersection of the non-integer circle outer circle and the cavity.

[0039] More specifically, the length of the first grinding sleeve is less than the length of the first discontinuous annular outer circle grinding section 1. If the first grinding sleeve is too long, the two ends of the first grinding sleeve will frequently contact the discontinuous annular outer circle grinding section, and the cutting amount at this position will be the largest, which will easily cause the annular groove and the end surface of the discontinuous annular outer circle grinding section to have a collapse. In the grinding method, the grinding is first performed from the first end of the first discontinuous annular outer circle grinding section 1 away from the second discontinuous annular outer circle grinding section 4. At this time, the relative distribution of the grinding paste is not very uniform. When the grinding reaches the non-integer circle outer circle grinding section 2, the first grinding sleeve is loosened, the grinding paste is evenly applied on the surface of the part, and the grinding paste is not squeezed on the three edges of the intersection of the outer circle and the cavity of the non-integer circle outer circle grinding section 2, thereby achieving relatively uniform removal of the excess amount. This method can effectively avoid the collapse of the three edges of the intersection of the outer circle and the cavity of the non-integer circle outer circle grinding section 2 due to the large cutting allowance. If the first grinding sleeve is too long, the cylindrical degree, conical ellipticity and straightness of the part will be out of tolerance.

[0040] The length of the second grinding sleeve is less than the length of the complete circle section in the non-integer circle outer circle grinding section 2. When grinding the non-integer circle outer circle grinding section 2, the second grinding sleeve is clamped at the complete circle section, and then the complete circle section is processed towards the non-integer circle outer circle (that is, the first retreat and then advance method). The clamping position of the second grinding sleeve has the largest removal amount in the first cutting. When the grinding reaches the non-integer circle outer circle, the grinding sleeve is loosened, and the removal amount is relatively uniform. This method can effectively avoid the collapse of the three edges of the intersection of the non-integer circle outer circle and the cavity due to the fast cutting.

[0041] It should be understood that after the grinding is completed, the part needs to be detected, including the cylindrical degree, roughness and quality inspection of the sharp edge finish. High-precision detection equipment such as a three-coordinate measuring instrument can be used for measurement to ensure that the machining quality of the part meets the design requirements.

[0042] The high-precision non-integer circle outer circle grinding method of the valve can effectively solve the problems of collapse, non-standard cylindrical degree, non-standard roughness and poor quality of sharp edge finish in the traditional machining method.

[0043] In one implementation, the length of the first grinding sleeve is two-thirds of the length of the first discontinuous annular outer circle grinding section 1.

[0044] Specifically, the length of the first grinding sleeve is designed as two-thirds of the length of the first discontinuous annular outer circle grinding section 1. This design not only avoids the risk of edge collapse caused by the overlong grinding sleeve, but also ensures the stability of the grinding sleeve when held by hand, thereby ensuring the accuracy of the part size. If the grinding sleeve is too short, it is easy to shake when held by hand, which affects the accuracy of grinding and the dimensional stability of the part.

[0045] In an implementation, the length of the second grinding sleeve is equal to the length of the complete circular section in the non-integer circular outer circle grinding section 2.

[0046] Specifically, the length of the second grinding sleeve is equal to the length of the complete circular section in the non-integer circular outer circle grinding section 2. Since the length of the grinding sleeve is equal to the length of the complete circular section in the non-integer circular outer circle grinding section 2, the grinding sleeve can naturally loosen when grinding to the non-integer circular outer circle, thereby avoiding excessive cutting force at the edge and effectively preventing edge collapse. When grinding the non-integer circular outer circle grinding section 2, the second grinding sleeve is clamped at the complete circular section, and then processed from the complete circular section to the non-integer circular outer circle. This grinding method ensures that the maximum amount of excess material is removed during the first cutting, and when the grinding sleeve is loosened when grinding to the non-integer circular outer circle, the amount of excess material becomes more uniform, thereby avoiding the risk of edge collapse.

[0047] In an implementation, when the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is used.

[0048] That is, when the first grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W14 or W10 is used. White corundum grinding paste is suitable for high-precision part grinding due to its high hardness, good wear resistance, and strong cutting force. When grinding the outer circle, too coarse grinding paste can easily cut too much material in unit time, and too fine grinding paste can slow down the cutting speed and easily scratch the surface of the part. Grinding paste with a particle size of W14 is suitable for preliminary grinding and can quickly remove excess material from the surface of the part; grinding paste with a particle size of W10 is suitable for fine grinding and can further refine the surface of the part to improve the smoothness and roughness. Selecting white corundum grinding paste with a particle size of W14 or W10 for grinding not only achieves high-precision grinding of the high-precision non-integer circular outer circle valve surface, but also effectively solves the problems of edge collapse, non-compliance with the cylindricality, non-compliance with the roughness, and poor quality of the sharp edge in the traditional machining method.

[0049] In an implementation, when the second grinding sleeve is used for grinding, white corundum grinding paste with a particle size of W10 or W7 is used.

[0050] Specifically, when using the second grinding bushing for grinding, white fused alumina grinding paste with a grit size of W10 or W7 is used. W10 grit is used for fine grinding to further refine the surface and improve both smoothness and roughness; W7 grit is used for ultra-fine grinding to achieve extremely high surface quality. Using white fused alumina grinding paste with a grit size of W10 or W7 can further improve the smoothness and roughness of the part's surface.

[0051] In one possible implementation, the non-circular valve further includes a second non-grinding section 5 connected to the end of the first discontinuous annular outer grinding section 1 away from the second discontinuous annular outer grinding section 4; the grinding method further includes: clamping the second non-grinding section 5 onto a fixture before starting grinding.

[0052] In other words, the non-circumferential valve also includes a second non-grinding section connected to the end of the first discontinuous annular outer circumference grinding section away from the second discontinuous annular outer circumference grinding section. The presence of the second non-grinding section provides a stable clamping point for the grinding process; it is clamped onto a fixture before grinding begins. The fixture design should ensure secure clamping of the non-grinding section while avoiding any impact on the grinding section. Clamping the non-grinding section helps maintain the valve's stability during grinding, preventing a decrease in grinding quality due to vibration or deformation.

[0053] Preferably, the clamp is a spring-loaded chuck. Specifically, when a grinding head uses a three-jaw chuck to clamp parts, the force is applied at three points, resulting in uneven force distribution across the entire outer circumference of the part, leading to significant runout. Excessive clamping force can damage or deform the part. This embodiment uses a spring-loaded chuck to clamp parts. Through its internal spring structure, the spring-loaded chuck can tightly clamp workpieces of different diameters, ensuring that the workpiece is not affected by vibration or deformation during grinding, thus maintaining uniform force on the part and avoiding damage and deformation. Furthermore, the runout is minimal and easily corrected. Simultaneously, the spring-loaded chuck is easy to operate, allowing for quick clamping and unclamping of workpieces, improving grinding efficiency.

[0054] In one possible implementation, the grinding method further includes cleaning the non-circumferential valve before grinding begins.

[0055] Specifically, before grinding begins, the non-circumferential valve is cleaned to remove oil, dust, and impurities from the workpiece surface, ensuring that the grinding paste can be applied evenly and effectively to the workpiece surface, thereby improving grinding efficiency and quality.

[0056] In one possible implementation, the grinding method further includes cleaning the first grinding sleeve and the second grinding sleeve before starting the grinding process.

[0057] Specifically, the first and second grinding sleeves are cleaned to remove oil, grinding paste residue and other impurities from the surface of the grinding sleeves, ensuring that the surface of the grinding sleeves is clean and avoiding the impact of impurities on the grinding quality and efficiency during the grinding process.

[0058] In this embodiment, the length of the second discontinuous annular outer grinding segment 4 is less than the length of the first discontinuous annular outer grinding segment 1.

[0059] For example, such as Figure 3 As shown, the working surface of the high-precision non-circular valve consists of several discontinuous annular outer circles at both ends. The cylindricity of the outer circles is 0.001 mm, and the surface roughness is Ra0.025. The middle working outer circle has a cavity and is a non-circular outer circle with a cylindricity of 0.002 mm and a surface roughness of Ra0.025. The dimension of this section of the outer circle is required to be (0.003~0.006) mm smaller than the discontinuous annular outer circles at both ends of the part. It is also required that the intersections of the working outer circle with each end face maintain a smooth and sharp edge. Due to the very high precision of the outer circle of this part, after machining using the traditional through-lap method, there is edge collapse at the intersection of the non-circular outer circle and the cavity, which cannot guarantee the requirements of 0.002 mm cylindricity and smooth and sharp edge. The several discontinuous annular outer circles at both ends of the working surface cannot guarantee the requirements of 0.001 mm cylindricity and smooth and sharp edge. At the same time, there are scratches on the surface of the part, which cannot guarantee the surface roughness requirement of Ra0.025. Therefore, it is difficult to guarantee the machining quality of parts processed using traditional grinding methods.

[0060] like Figure 3 As shown, the high-precision non-circular valve outer circle anti-collapse edge grinding method of this embodiment is described in detail below:

[0061] 1) The material of this part is alloy structural steel 16Cr2MnTiA. The hardness of the outer circle is HRC58~64, the hardness of the center is HRC≤40, and the grinding allowance of the outer circle is (0.01~0.015) mm.

[0062] 2) Make two grinding sleeves. The length of the first grinding sleeve is 2 / 3 of the length of section B in the part, and it is used for grinding the part. The length of the second grinding sleeve is the length of section L in the part minus the length of the non-circular outer circle, and it is used for grinding the non-circular outer circle grinding section 2.

[0063] 3) When making the grinding sleeve, install it on the grinding head and 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 other end of the grinding sleeve inlet. Ensure that there are no sharp edges or burrs at the inlet and opening of the grinding sleeve to prevent scratching the outer circle of the part.

[0064] 4) Clean the grinding sleeve thoroughly to prevent metal shavings from remaining inside the grinding sleeve during grinding of the outer diameter, which could scratch the outer diameter of the part;

[0065] 5) Clean the parts to prevent metal chips or foreign objects on the outer surface of the part during the outer circle grinding;

[0066] 6) The second non-grinding section 5 (non-machining end) of the part is installed on the spring-loaded chuck of the grinding trolley head, the first grinding sleeve passes through the part, and the first grinding sleeve is clamped at the annular circumference at the left end of the working surface to grind the part. W14 or W10 grinding paste is evenly applied on the outer circle of the working circle, and the part is ground in a retreat and advance manner, leaving a (0.004-0.006) mm allowance on the non-integral circumference outer circle section in the middle. The outer circle of the left and right ends with an interrupted annular circumference has a cylindricality of 0.001 mm, a smooth sharp edge, and a roughness Ra of 0.025, which is processed to be qualified, and local point position is allowed to be out of tolerance;

[0067] 7) The second grinding sleeve passes through the part and clamps the grinding sleeve at the complete outer circle of the non-integral circumference outer circle grinding section 2. W10 or W7 grinding paste is used in a retreat and advance grinding manner to ensure a cylindricality of 0.002 mm, a smooth sharp edge, and a roughness Ra of 0.025.

[0068] 8) When there is local point position out of tolerance in the cylindricality of a certain section of the outer circle, the second grinding sleeve is clamped at the outer circle, W10 or W7 grinding paste is used in a retreat and advance manner to ensure the relevant requirements.

[0069] Because the intersection of the non-integral circumference outer circle and the cavity requires a smooth sharp edge, when the grinding allowance is large, the grinding paste quickly cuts the allowance at the 3 edges where the non-integral circumference outer circle intersects with the cavity during the grinding process, which easily leads to the formation of collapsed edges at the 3 edges where the non-integral circumference outer circle intersects with the cavity. Therefore, after many tests and verifications, it is found that leaving a (0.01-0.015) mm allowance for the outer circle in the previous process and a (0.004-0.006) mm allowance for the segmented outer circle grinding are more appropriate.

[0070] In this embodiment, the length of the first grinding sleeve is 14 mm, and the length of the second grinding sleeve is 6 mm.

[0071] The processing method involved in this embodiment has been verified by multiple high-precision non-integral circumference valve parts on site. It can directly leave appropriate machining allowances for the outer circle of high-precision non-integral circumference valve parts, use a combination of general grinding and segmented grinding methods, change the clamping position and grinding direction of the grinding sleeve, use appropriate grinding paste, and ensure the cylindricality, smooth sharp edge, and roughness of the parts. This method is simple to operate and has no implementation difficulties, and can effectively ensure the processing quality and efficiency of the parts. At the same time, this method is easy to use on the production site and can be applied to the processing of all high-precision non-integral circumference valve parts, improving the processing efficiency and qualification rate of the parts and meeting the demand for timely delivery of the parts. At the same time, it provides experience for the processing of such non-integral circumference valve parts.

[0072] In the description of the application, it needs to be understood that the terms "upper", "lower", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0073] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0074] In the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0076] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like 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 application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0077] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, and are used to illustrate the technical solutions of the present application, but are not limitations thereof. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features within the technical range disclosed by the present application. The modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-precision non-circular valve outer circle collapse edge grinding method, characterized in that, The non-circular gate includes a first discontinuous annular outer circle grinding section (1), a non-circular outer circle grinding section (2), a first non-grinding section (3), and a second discontinuous annular outer circle grinding section (4) connected in sequence. The non-circular outer circle grinding section (2) includes a complete circumferential segment. The grinding method includes: The grinding method is adopted, and the first grinding sleeve is used to grind between the end of the first discontinuous annular outer circle grinding section (1) away from the second discontinuous annular outer circle grinding section (4) and the end of the second discontinuous annular outer circle grinding section (4) away from the first discontinuous annular outer circle grinding section (1). Grinding starts from the end of the first discontinuous annular outer circle grinding section (1) away from the second discontinuous annular outer circle grinding section (4) and gradually moves towards the middle until the first discontinuous annular outer circle grinding section (1) and the second discontinuous annular outer circle grinding section (4) are ground to the set requirements. The length of the first grinding sleeve is less than the length of the first discontinuous annular outer circle grinding section (1). The grinding process is carried out by using a retracting grinding method. The grinding is performed between the two ends of the non-circular outer circle grinding section (2) using a second grinding sleeve. The second grinding sleeve is clamped at the complete circumference of the non-circular outer circle grinding section (2), and then the grinding is carried out from the complete circumference to the non-circular outer circle until the non-circular outer circle grinding section (2) is ground to the set requirements. The length of the second grinding sleeve is less than the length of the complete circumference in the non-circular outer circle grinding section (2). The non-circular outer circle grinding section (2) is ground to a cylindricity of 0.002 mm, a smooth sharp edge, and a roughness of Ra0.

025. The non-circular valve further includes a second non-grinding section (5) connected to one end of the first intermittent annular outer grinding section (1) away from the second intermittent annular outer grinding section (4); the grinding method further includes: Before grinding begins, the second non-grinding section (5) is clamped onto the fixture.

2. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve, characterized in that, The length of the first grinding sleeve is two-thirds of the length of the first discontinuous annular outer grinding section (1).

3. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve, characterized in that, The length of the second grinding sleeve is equal to the length of the complete circumference segment in the non-circumference outer circle grinding segment (2).

4. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. When grinding with the first grinding sleeve, use white corundum grinding paste with a particle size of W14 or W10.

5. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. When using the second grinding sleeve for grinding, use white corundum grinding paste with a particle size of W10 or W7.

6. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. The clamp is a spring-loaded chuck.

7. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. Grinding methods also include: Before grinding begins, the non-circular valve is cleaned.

8. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. Grinding methods also include: Before starting the grinding process, the first grinding sleeve and the second grinding sleeve are cleaned.

9. The method of claim 1, wherein the method is a high-precision non-circular outer edge collapse-preventing grinding method for a valve. The length of the second discontinuous annular outer circle grinding section (4) is less than the length of the first discontinuous annular outer circle grinding section (1).

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