A method of machining a die press air valve seal face

Abstract

The application provides a mould pressing air valve sealing surface processing method, which comprises the following steps: S1, selecting different cutters when processing the sealing end surface of the air valve, selecting a gem turning tool when processing the sealing surface of a non-metal part, and selecting a metal processing cutter when processing a first metal part and a second metal part; S2, processing the non-metal part by using the gem turning tool and processing the first metal part and the second metal part by using the metal processing cutter; S3, feeding from the junction line between the first metal part and the non-metal part to the non-metal part position on one side, turning the non-metal part from outside to inside by using the gem turning tool, and retreating from the junction line between the non-metal part and the second metal part to the non-metal part position; S4, feeding again from the initial feeding position of the non-metal surface processing in S3, turning the first metal part from inside to outside by using the metal processing cutter; S5, feeding again from the retreating position of the non-metal surface processing in S3, turning the second metal part from outside to inside by using the metal processing cutter; and S6, removing the excess.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing, and particularly relates to a processing method for a sealing surface of a die-pressed air valve. BACKGROUND

[0002] The sealing element air valve is die-pressed, and the sealing surface end is composed of a first metal part, a non-metal part and a second metal part from outside to inside. The non-metal part in the middle for sealing is die-pressed. Since the product has high sealing performance requirements, the sealing leakage rate of the sealing pair is required to be less than or equal to 10 - 5 Pa.m 3 / s. Therefore, the sealing surface roughness of the sealing element air valve is required to be high, and the part needs to be checked under a 10 times microscope to be free of excess material.

[0003] The current processing method is to process the entire sealing surface from outside to inside by using a metal processing tool or to process the entire sealing surface from outside to inside by using a gem turning tool and to process the entire sealing surface by using a grinding tool.

[0004] The single metal processing tool is difficult to ensure that the roughness of the non-metal sealing surface meets the requirements, the single gem turning tool has a fast tool wear and a high cost of the part, and the metal iron chips generated in the current processing method are embedded in the non-metal surface, and the excess material is difficult to meet the requirements. SUMMARY

[0005] In view of the above problems, the purpose of the application is to provide a processing method for a die-pressed air valve sealing surface, so that the roughness of the non-metal sealing surface and the performance index of the part meet the requirements.

[0006] The technical scheme adopted by the application is as follows:

[0007] A processing method for a die-pressed air valve sealing surface, comprising the following steps:

[0008] S1 tool selection: different tools are selected when processing the sealing end surface of the air valve, a gem turning tool is selected when processing the non-metal part sealing surface, and a metal processing tool is selected when processing the first metal part and the second metal part;

[0009] S2 part processing: a gem turning tool is used to process the non-metal part, and a metal processing tool is used to process the first metal part and the second metal part;

[0010] S3 non-metal surface processing tool path: the tool is fed from the position of the non-metal part on the junction line between the first metal part and the non-metal part, the non-metal part is turned from outside to inside by using the gem turning tool, and the tool is withdrawn at the position of the non-metal part on the junction line between the non-metal part and the second metal part.

[0011] S4 metal part No. 1 processing tool path: from the non-metallic surface processing initial tool position in S3, re-entering the tool, using metal processing tools to turn the metal part No. 1 from inside to outside;

[0012] S5 metal part No. 2 processing tool path: from the non-metallic surface processing retreat position in S3, re-entering the tool, using metal processing tools to turn the metal part No. 2 from outside to inside.

[0013] S6 excess removal.

[0014] The S1 also includes tool installation and tool setting. When setting the tool, the height of the tip of the gem turning tool for non-metallic part processing and the height of the tip of the metal processing tool for metal part processing should be consistent.

[0015] The S3 metal part No. 1 and the non-metallic part intersection line at the non-metallic part position is specifically at φ2.6, and the turning is ended at φ0.6 to retreat axially.

[0016] The S4 tool entry position is 0.05mm apart from the tool entry position in S3, specifically at φ2.5.

[0017] The S5 tool entry position is from φ0.65.

[0018] Further, the cutting depth used in S3 turning is 0.03-0.04mm, and the feed rate is 0.01-0.03mm.

[0019] Further, the turning speed of the lathe in S3 is 2500-3000r / min.

[0020] In S6, when processing metal part No. 1, the program is programmed to add a fillet, which can remove the excess on the circumference, and the excess at the intersection of the square and the end face of metal part No. 1 is removed manually.

[0021] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present application are:

[0022] Two tools are used to process different areas of the sealing surface, which can meet the high precision requirement of Ra0.2, and also avoid the problem of fast wear of the gem turning tool when processing the non-metallic sealing surface. Secondly, the tool path is adjusted in the present application, the gem turning tool is used to process the non-metallic part first, and then the metal processing tool is used to process metal part No. 1 and metal part No. 2, so that the iron filings generated during processing are on the outside of metal part No. 1, which is convenient for removal. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. Other related drawings can also be obtained by those of ordinary skill in the art without creative labor.

[0024] Figure 1 Structure diagram of the air valve of the embodiment 1 of the present application;

[0025] Figure 2 Structure diagram of the sealing pair of the air valve and the valve seat;

[0026] Figure 3 Processing tool path diagram of the non-metal sealing surface end;

[0027] Figure 4 Processing tool path diagram of the sealing end surface of the first metal part;

[0028] Figure 5 Processing tool path diagram of the sealing end surface of the second metal part.

[0029] BRIEF DESCRIPTION OF DRAWINGS: 1-first metal part, 2-second metal part, 3-non-metal part, 4-valve seat. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of the present application.

[0032] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In the description of the present application, it is also necessary to explain that, unless explicitly defined and limited, if the terms "set", "install", "connect", "connect" appear, they should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. 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.

[0034] The application will be described below Figures 1-5 The application will be described below

[0035] Embodiment 1

[0036] A mold pressing air valve sealing surface processing method, comprising the following steps:

[0037] S1 cutter selection: different cutters are selected when processing the sealing end surface of the air valve, a gem turning tool is selected when processing the sealing surface of the non-metallic part 3, and a metal processing cutter is selected when processing the first metal part 1 and the second metal part 2. After the cutter is selected, the installation and setting of the cutter are completed. When setting the cutter, the height of the cutting edge of the gem turning tool for processing the non-metallic part 3 and the metal processing cutter for processing the metal part should be consistent. It can ensure that the entire surface of the non-metallic sealing end surface is flush.

[0038] S2 part processing: the non-metallic part 3 is processed by a gem turning tool, and the first metal part 1 and the second metal part 2 are processed by a metal processing cutter.

[0039] S3 the structure of the sealing pair is as shown in Figure 2 The position of the sealing ring band is φ0.9mm-φ1.2mm, and the sealing pair ring band formed by the non-metallic part 3 filled by mold pressing and the sealing surface of the valve seat 4 should not have any defects that affect sealing within ±0.2mm (i.e. φ0.7mm-φ1.4mm). Figure 2

[0040] S3 non-metallic surface processing tool path: from the junction line between the first metal part 1 and the non-metallic part 3, the tool is fed from the position of the non-metallic part 3 side, and the specific position of the tool is Figure 3 ​φ2.6, the non-metallic part is turned outwards by a gem tool, and the tool is withdrawn at the position where the non-metallic part 3 and the second metal part 2 meet, the specific position is Figure 3 φ0.6. The tool path of the non-metallic surface is as shown in Figure 3 the arrow directions one, two and three. In order to ensure that the roughness of the sealing surface of the non-metallic part 3 is Ra0.2, the cutting depth is 0.03mm and the feed is 0.01mm in the non-metal processing of S3, and the processing speed of the lathe is 2800r / min, so that the temperature of the tool does not change the performance of the non-metallic sealing surface.

[0041] The tool path of the first metal part 1 in S4 is: the tool is re-entered from the initial tool entering position of the non-metal surface in S3, and the specific position is Figure 4 φ2.5, the first metal part 1 is turned outwards by a metal tool, and the tool path of the first metal part 1 is as shown in Figure 4 the arrow directions four and five.

[0042] The tool path of the second metal part 2 in S5 is: the tool is re-entered from the tool withdrawing position of the non-metal surface in S3, and the specific position is Figure 5 φ0.65, the second metal part 2 is turned inwards by a metal tool, and the tool path of the second metal part 2 is as shown in Figure 5 the arrow directions six and seven.

[0043] S6: Excess removal: When the first metal part 1 is processed, the program is compiled to increase the fillet, which can remove the excess on the circumference, and the excess at the intersection of the square and the sealing surface is removed manually, so that the iron filings generated during processing are outside the first metal part 1, which is convenient for removal.

[0044] After the excess removal is completed, the inspection is carried out, which includes:

[0045] Excess inspection: no excess is found under 10 times microscope; roughness detection: the roughness of the non-metallic sealing surface is required to be Ra0.2, and the roughness of the metal surface flush with the non-metallic sealing surface is required to be Ra3.2.

[0046] The structure of the air valve is as shown in Figure 1As shown, the air valve includes a first metal part 1 and a second metal part 2, the first metal part 1 and the second metal part 2 are assembled by press fitting to form an annular groove between the first metal part 1 and the second metal part 2, and a non-metal part 3 is filled in the annular groove by die pressing. The air valve has an outer dimension of an outer diameter of 5 mm x a length of 5 mm, and the diameter of the second metal part is 0.5 mm. The design requires that the sealing surface end of the air valve is a plane, and the sealing surface end is from outside to inside of a metal material, a non-metal material and a metal material. The roughness requirement of the non-metal sealing surface is Ra0.2, and the roughness requirement of the metal surface flush with the non-metal sealing surface is Ra3.2. Secondly, the valve has high sealing requirement, and the helium detection requirement of the sealing leakage rate of the sealing pair is less than or equal to 10 -5 Pa.m 3 / s, so the excess control requirement is also high, and the parts in the valve cavity need to be checked under a 10 times microscope to be free of excess. Because the size of the part is small, the excess generated during machining, such as near the non-metal sealing part, is not easy to operate when removed, and the sealing surface is easily damaged.

[0047] Currently, the following several conventional machining methods are commonly used to machine the sealing surface of the air valve: (1) the entire sealing surface end is machined from outside to inside by a metal machining tool; (2) the entire sealing surface is machined from outside to inside by a gem turning tool; (3) the entire sealing surface is machined by grinding. The three methods have the following defects: (1) the sealing surface is composed of the first metal part 1, the second metal part 2 and the non-metal part 3, the metal machining tool is used to machine the entire sealing surface, and the metal machining tool cannot meet the roughness requirement Ra0.2 of the non-metal part 3 sealing surface in the face of different regions of the sealing surface. (2) the gem turning tool is used to machine the entire sealing surface, the tool wears quickly, and the gem turning tool is relatively expensive, so the cost is high. (3) during grinding, the grinding paste is embedded in the non-metal sealing surface, and the embedded grinding paste affects the sealing performance of the sealing pair.

[0048] The die pressing air valve sealing surface machining method adopted by the present application is that two tools are used to machine different regions of the sealing surface, the gem turning tool can meet the high precision requirement Ra0.2 at a cutting depth of 0.03 mm, a feed amount of 0.01 mm and a rotating speed of 2800 r / min, and the problem of fast wear of the gem turning tool machining the metal sealing surface is avoided. Secondly, the tool path is adjusted, the non-metal part 3 is machined by the gem turning tool first, and then the first metal part 1 and the second metal part 2 are machined by the metal machining tool, so that the iron filings generated during machining are outside the first metal part 1, and are easy to remove.

[0049] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of processing a die press air valve seal face, the method comprising: It comprises the following steps: S1 tool selection: different tools are selected when machining the sealing end face of the air valve, a gem turning tool is selected when machining the sealing face of the non-metallic part (3), and a metal machining tool is selected when machining the first metal part (1) and the second metal part (2); S2 part machining: the non-metallic part (3) is machined by using a gem turning tool, and the first metal part (1) and the second metal part (2) are machined by using a metal machining tool; S3 non-metallic face machining tool path: the tool is fed from the position of the junction line between the first metal part (1) and the non-metallic part (3) on the side of the non-metallic part (3), the non-metallic part (3) is turned from outside to inside by using a gem turning tool, and the tool is withdrawn when the turning reaches the position of the junction line between the non-metallic part (3) and the second metal part (2) on the side of the non-metallic part (3); S4 first metal part (1) machining tool path: the tool is fed again from the initial feeding position of the non-metallic face machining in S3, and the first metal part (1) is turned from inside to outside by using a metal machining tool; S5 second metal part (2) machining tool path: the tool is fed again from the withdrawal position of the non-metallic face machining in S3, and the second metal part (2) is turned from outside to inside by using a metal machining tool; S6 excess removal.

2. A method of processing a die press gas valve seat surface as defined in claim 1 wherein, The tool installation and tool setting in S1 are also included, and the height of the tool tip of the gem turning tool for machining the non-metallic part (3) and the metal machining tool for machining the metal part is kept consistent during tool setting.

3. The method of claim 1 wherein, The position of the junction line between the first metal part (1) and the non-metallic part (3) on the side of the non-metallic part (3) in S3 is specifically φ2.6, and the axial withdrawal is ended when the turning reaches φ0.

6.

4. The method of claim 1 wherein, The feeding position in S4 is spaced 0.05mm from the feeding position in S3, and specifically φ2.

5.

5. The method of claim 1 wherein, The feeding position in S5 is from φ0.

65.

6. A method of processing a die press gas valve seat surface as defined in claim 1 or 3 wherein, The cutting depth during turning in S3 is 0.03-0.04mm, and the feed rate is 0.01-0.03mm.

7. A method of processing a die press gas valve seat surface as defined in claim 1 or 3 wherein, The rotating speed of the lathe machining in S3 is 2500-3000r / min.

8. The method of claim 1 wherein, In S6, the program is programmed to increase the chamfering to remove the excess when machining the first metal part (1), and the excess at the intersection between the square and the end face of the first metal part (1) is removed manually.

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