Joint surface processing method

Abstract

The invention relates to a joint surface processing method, the joint surface is used for sealing cooperation of an upper semi-closed cylinder body and a lower semi-closed cylinder body, the method comprises the following steps: S1, reference conversion: welding auxiliary process reference blocks around the joint surface, and adding cushion blocks on opposite sides of the cylinder body joint surface; s2, scribing; s3, the upper cylinder body and the lower cylinder body are subjected to rough milling and semi-finish milling correspondingly; s4, matching upper and lower cylinder connecting holes by a bench worker; s5, drilling a connecting surface threaded hole; s6, joint surface positioning pin holes are milled and drilled; s7, performing finish milling on the upper cylinder body and the lower cylinder body; s8, the upper cylinder body and the lower cylinder body are respectively subjected to bench work treatment, deburring, acute angle chamfering, workpiece cleaning, workpiece number machining and anti-rust oil coating; s9, preliminary joint surface detection; s10, grinding the joint surfaces, namely respectively grinding the upper cylinder body and the lower cylinder body after cleaning the joint surfaces of the cylinder bodies; s11, water pressure test verification; according to the method, the sealing effect of the closed cavity is achieved by machining the joint surface on the premise that no sealing groove and no sealing ring exist.

Description

Technical Field

[0001] The present invention relates to the technical field of complex sealing surface machining, and particularly to a mating surface machining method. Background Art

[0002] At present, the closed cavity structure is widely used in industry. For example: steam turbines or gas turbines in the field of thermal power generation; gas turbines, combustion chambers, etc. of engine components; reactors and distillation towers in the petrochemical industry; solar panels and wind power generation equipment in new energy development, etc. In short, the closed cavity structure is widely used in industry and plays an important role in improving the performance, safety and stability of equipment.

[0003] For the sealing method between closed cavity bodies, the existing method basically seals by adding a "sealing groove plus rubber ring" structure at the connecting flange. However, its high temperature resistance and corrosion resistance are relatively poor. During use, the rubber ring needs to be replaced regularly to achieve long-term sealing effectiveness. For some equipment, the cost of disassembling and replacing the sealing ring is relatively high or even impossible to disassemble, and the disassembly and assembly also have a certain impact on the accuracy of the equipment itself, etc.

[0004] Therefore, it is necessary to provide a process method that can ensure the sealing performance by machining the mating surface through process means when it is difficult or impossible to use a sealing ring for sealing in a closed cavity. Summary of the Invention

[0005] Based on the above description, the present invention provides a mating surface machining method, which can solve the sealing requirement problem of equipment with high temperature requirements and does not require regular disassembly and reinstallation of the sealing ring.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A mating surface machining method, where the mating surface is used for the sealing fit of the upper and lower semi-closed cylinder bodies. The position where the upper and lower cylinder bodies are connected is a flange structure, and they are tightened by the mutual cooperation of fasteners; The method includes the following steps: S1. Benchmark transformation, including welding auxiliary process benchmark blocks around the mating surface and adding pads on the opposite sides of the cylinder body mating surface; S2. Marking, marking the upper and lower cylinder bodies in pairs and using the center lines of each part as the reference benchmark; S3. Rough milling and semi-finish milling of the upper and lower cylinder bodies respectively; S4. Fitter numbering the connection holes of the upper and lower cylinders; S5. Drilling the threaded holes on the connection surface; S6. Milling and drilling the positioning pin holes on the mating surface; S7. Finish milling the upper and lower cylinder bodies respectively, and finish milling the mating surface to the requirements of the drawing; S8. The upper and lower cylinder blocks are each processed by a fitter, deburred, the sharp corners are chamfered, the workpieces are cleaned, part numbers are marked, and antirust oil is applied. S9. Preliminary detection of the mating surface. S10. Grinding the mating surface. After cleaning the mating surface of the cylinder block, grind the upper and lower cylinder blocks separately. S11. Verification by hydrostatic test.

[0007] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: The mating surface processing method provided by the present application realizes sealing through the form of two flange mating surfaces, meets the sealing requirements of equipment with high-temperature requirements, and does not require regular reinstallation of the sealing ring; on the premise of no sealing groove and sealing ring, the sealing effect of the closed cavity is achieved by processing the mating surface.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Further, in step S1, the welding of the auxiliary process reference block is used for the alignment and base confirmation of the parts; the addition of the spacer is used to improve the leveling effect of the rough surface.

[0010] Further, step S3 includes: S31. Place the cylinder block with the side facing up and the mating surface facing the gantry on the adjusting shims, and align the workpiece according to the rough part inspection data and the marked lines. S32. Raise the right-angle milling head, with the spindle facing the reference surface of the spacer, and take a cut on the reference surface of the spacer for four visible places. S33. Rotate the right-angle milling head by 180°, with the spindle facing the mating surface; rough mill the mating surface. S34. Turn the workpiece over, place it on the equal-height shims with the reference surface of the spacer facing down, check the contact with tissue paper, level it according to surface A, align it according to the line, tighten evenly, semi-finish mill the mating surface, and machine the connection holes of the mating surface to the drawing requirements according to the coordinate dimensions.

[0011] Further, step S4 includes: S41. Place the bottom surface of the lower cylinder flat on the assembly platform, place the upper cylinder after leveling according to the mid-separation surface, adjust the upper cylinder, and require that the contour misalignment of the four sides of the upper and lower cylinders is ≤2 mm. Cooperate with the line marker to check the machining allowance of each surface of the upper and lower cylinders by drawing lines. S42. Cooperate with the line marker to mark the position line of the screw holes according to the position of the machined holes on the upper cylinder.

[0012] Further, step S5 includes: machining the threaded holes using a gantry milling machine according to the hole positions marked in step S4.

[0013] Further, step S6 includes: S61. The bottom surface of the lower cylinder faces downward, one side faces the gantry, and it is placed on equal-height shims. Use tissue paper to check the contact, align it according to the line, and tighten it evenly. S62. Machine the pin holes to the requirements of the drawing according to the mating number positions.

[0014] Further, step S7 includes: S71. The reference surface of the spacer block faces downward, one end faces the gantry, and it is placed on equal-height shims. Use tissue paper to check the contact, level it within 0.1 mm according to the mating surface, align it according to the line, and tighten it evenly. S72. Finish milling the mating surface to the requirements of the drawing to ensure the wall thickness of the mating surface.

[0015] Further, step S9 includes: S91. Apply blue oil on the mating surface of the upper cylinder with an oil film thickness of 6 - 7 μm. Combine the upper and lower cylinders in a free state and use a feeler gauge to detect. S92. Tighten and then loosen the fasteners, disassemble the upper and lower cylinders, and observe the contact situation of the blue oil on the lower cylinder.

[0016] Further, step S10 includes: S101. Clean the mating surface of the cylinder block and wipe it clean with a soft cloth. S102. Use a roller brush coated with blue oil on the surface of the cast iron platform and evenly apply the blue oil back and forth on the platform surface. S103. Use the platform to lap with the mating surface of the cylinder block, start grinding from the maximum point, and gradually expand to the surrounding. S104. Grind the upper and lower cylinder blocks respectively according to the process requirements.

[0017] S105. After the upper and lower cylinder blocks are respectively ground, turn over the upper cylinder. First, clean the mating surface of the upper cylinder, then evenly apply blue oil on the mating surface with a roller brush, and then turn it over and buckle the cylinder to check the grinding effect.

[0018] Further, step S11 includes: S111. Verification preparation, add process water injection holes and pressure detection holes, and install all tooling and bolts to the corresponding positions. S112. Inject water. Inject water into the lower water injection hole until there is no air in the test liquid passing through the pressure hole, and install the pressure gauge and pressurizing equipment to the top pressure hole. S113. Pressure test. After staying in the state of being filled with water for a predetermined time without abnormal conditions, start pressurizing and maintain it, and detect whether there is any water leakage. S114. Reduce the pressure and drain the water. Description of the Drawings

[0019] Figure 1 It is a step schematic diagram of a mating surface processing method provided by an embodiment of the present invention. Figure 2 Schematic diagram of the position of the auxiliary process reference block in the embodiment of the present invention; Figure 3 Top view schematic diagram of the position of the auxiliary process reference block in the embodiment of the present invention; Figure 4 Top view schematic diagram of the position of the spacer block in the embodiment of the present invention. Detailed implementation manners

[0020] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0022] It can be understood that spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over" etc. can be used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the figure is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "below" can include both the upper and lower orientations. In addition, the device can also include additional orientations (such as rotating 90° or other orientations), and the spatial descriptions used herein are accordingly interpreted.

[0023] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is an electrical signal or data transmission between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0024] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / comprising", "has / including", etc. specify the presence of the stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0025] As Figure 1 As shown, the present application provides a method for machining a mating surface. The part structure suitable for this process method consists of two upper and lower semi-closed cavities, namely the upper cylinder block 10 and the lower cylinder block 20. The upper cylinder block 10 and the lower cylinder block 20 are preferably semi-closed cavity structures with a rectangular cross-section and one open end. The position where the upper and lower cylinder blocks meet is a flange structure, which is fastened together using fasteners.

[0026] The method includes the following steps: S1. Datum transformation, as Figures 2 - 4 shown, including welding auxiliary process datum blocks 30 around the mating surface and adding spacer blocks 40 on the opposite sides of the cylinder block mating surface; Specifically, since it is impossible to align using the mating surface after cylinder assembly, if there are other machining parts on the part, the part cannot be aligned and the datum confirmed. Therefore, it is necessary to weld auxiliary process datum blocks around the mating surface.

[0027] Due to the poor leveling effect of the rough surface, it is necessary to add spacer blocks 40 at one end of each cylinder block away from the mating surface.

[0028] S2. Marking, marking the upper and lower cylinder blocks in pairs and using the center lines of the part as the reference datum; Specifically, using the rough part inspection data as the basis for marking. The upper and lower cylinder blocks 10, 20 are marked in pairs, using the center lines of the part as the reference datum. While taking into account the thickness of the mating surface, the allowances for other functional machining surfaces of the part are also considered. When marking, check whether the allowances for each machining part are sufficient, whether the hole positions meet the drawing dimensions, and check whether there are any welding deformations and defects in the rough part.

[0029] S3. Rough milling and semi-finish milling of the upper and lower cylinder blocks 10, 20 respectively; In the present application, an XKU2655×420 / 50×20 - 30×20 model gantry milling machine is selected.

[0030] Specifically, step S3 includes: S31. Place the cylinder block on its side with the joint face facing the gantry on the adjusting shims. Align the workpiece according to the rough blank inspection data and the marked lines. The center of the aligned workpiece should be consistent with the center of the rough blank. Tighten evenly. Note that when clamping, the joint faces of the upper and lower cylinder blocks 10 and 20 should be placed face to face for paired clinical inspection of the machining allowances of each machining part.

[0031] Among them, it is necessary to clinically inspect the thickness and flatness of the joint face and record the data. Also, program the dial indicator to check the machining allowances of other machining surfaces and the holes on them (if any on the part) and record the data.

[0032] S32. Install the right-angle milling head with the spindle facing the reference surface of the shim. Take a cut on the reference surface of the shim four times until it is smooth. The roughness should reach 3.2 mm for use as a shim for subsequent operations.

[0033] S33. Rotate the right-angle milling head 180°. The spindle faces the joint face. Rough-mill the joint face, leaving a 2-mm allowance. The roughness should reach 3.2 mm. Note that no chamfers are made on the four sides of the joint face.

[0034] S34. Turn the workpiece over, place it on the equal-height shims with the reference surface of the shim facing down. Check the contact with tissue paper, level it according to surface A, align it according to the lines, and tighten evenly. Semi-finish mill the joint face, leaving a 1-mm allowance, with a flatness of 0.1 mm and a roughness of 1.6. Drill, ream, and counter-scrape the connecting holes of the joint face to the drawing requirements according to the coordinate dimensions. In this embodiment, the process requirement is that the diameter of the connecting hole of the joint face ФA is machined to ФA (+0.1~0.2) for use with a center punch of ФA (-0.1~0) number hole during subsequent cylinder assembly.

[0035] It can be understood that placing the workpiece on the equal-height shims, checking the contact with tissue paper, aligning it according to the lines, and tightening evenly is a common fixing method of the workpiece on the milling machine, which will not be elaborated here.

[0036] Cutting parameters: for rough milling, the cutting depth a = 3 - 5 mm, the chip load per tooth fz = 0.25 - 0.35 mm / z, and the cutting speed v = 80 - 120 m / min. S4. The fitter numbers the connecting holes of the upper and lower cylinders. Specifically, step S4 includes: S41. Place the bottom surface of the lower cylinder flat on the assembly platform. After leveling according to the middle dividing surface, place the upper cylinder and adjust the upper cylinder. It is required that the contour misalignment of the four sides of the upper and lower cylinders is ≤ 2 mm. Cooperate with the line marker to check the machining allowances of each surface of the upper and lower cylinders to ensure that the upper and lower cylinders meet the machining requirements. S42. Cooperate with the line marker to number the position lines of the screw holes according to the position of the previously machined ФA (+0.1~0.2) hole on the upper cylinder. Note that the center punch mark of this hole should not be too deep, within 2 mm.

[0037] S5, drilling threaded holes on the connection surface; using a gantry milling machine to process the threaded holes according to the hole positions assigned in step S4; cutting parameters, rough milling thickness a = 3 ~ 5mm, removal amount per tooth fz = 0.25 ~ 0.35mm / z, cutting speed v = 80 ~ 120m / min; S6, milling and drilling the positioning pin holes on the joint surface; Wherein, step S6 comprises: S61. Place the bottom of the lower cylinder downward with one side facing the gantry on the same height pads, pull out paper to check the contact, align it according to the line, and tighten it evenly; S62. Process the pin holes according to the matching position to the requirements of the drawing. Specifically, drill, expand and ream the 4*Ф30 / Ф20 taper pin holes according to the matching position of the upper cylinder body 10 to the requirements of the drawing, and cooperate with the fitter to check the contact. Cutting parameters, rough milling thickness a=3~5mm, removal amount per tooth fz=0.25~0.35mm / z, cutting speed v=80~120m / min.

[0038] S7. The upper and lower cylinder bodies 10 and 20 are respectively precision milled, and the joint surfaces are precision milled to the requirements of the drawings; Wherein step S7 comprises: S71. Place the block with the reference surface facing downward and one end facing the gantry on the shim of equal height. Check the contact by drawing paper. Level the joint surface within 0.1mm, straighten it according to the line, and tighten it evenly. S72. Fine mill the mating surface to the requirements of the drawing to ensure the wall thickness of the mating surface. Process requirements: roughness to 1.6, A surface flatness within 0.05.

[0039] S8. The upper and lower cylinder bodies are processed by benchwork, burrs are removed, sharp corners are blunted, workpieces are cleaned, part numbers are made, and anti-rust oil is applied; S9, preliminary joint surface inspection; Step S9 includes: S91. Apply blue oil on the joint surface of the upper cylinder with an oil film thickness of 6 to 7 μm. Put the upper and lower cylinders together in a free state and use a feeler gauge to check to ensure that the 0.02 mm feeler gauge on the inside does not penetrate and the 0.05 mm feeler gauge on the outside does not penetrate.

[0040] S92. Tighten the fasteners to 840Nm and then loosen them. Disassemble the upper and lower cylinders and observe the blue oil contact of the lower cylinder. If the blue oil contact surface of the lower cylinder accounts for 85% or more, the condition is optimal and the next sequence can be carried out. If not, fine grinding or fine milling should be performed for repair. S10, grinding the joint surface, cleaning the joint surface of the cylinder body and grinding the upper and lower cylinder bodies respectively; Further, step S10 includes: S101. Clean the mating surface of the cylinder block and wipe it clean with a soft cloth. At this time, note that there should be no impurities. When applying blue oil to the platform, attention must be paid to cleanliness to prevent sand grains, iron filings or other dirt from being mixed in to avoid scratching the mating surface during lapping.

[0041] S102. Use a roller brush coated with blue oil on the surface of the cast iron platform and evenly apply the blue oil back and forth on the platform surface, striving to achieve the thinnest and most uniform application.

[0042] S103. Grind the upper and lower cylinder blocks separately. Use the platform to push and grind with the mating surface of the cylinder block, start grinding from the largest point and gradually expand to the surrounding; the grinding amount each time should be as small as possible to avoid pits on the surface; after each grinding, use the platform to grind back and forth longitudinally and transversely (on the inner and outer sealing surfaces) to check the contact situation by coloring, ensuring that there are no grinding marks, scratches, impurities, dirt, etc. on the surface after lapping.

[0043] S104. Grind the upper and lower cylinder blocks separately according to the process requirements.

[0044] S104. After the upper and lower cylinder blocks are ground separately, turn over the upper cylinder block. First, clean the mating surface of the upper cylinder block, then evenly apply blue oil on the mating surface with a roller brush, and then turn it over and buckle the cylinder; at this time, note that first use a feeler gauge to measure the free clearance of the mating surface, then tighten the bolts on the split surface (tighten one every other one), and then use a feeler gauge to measure the clearance of the split surface. After there is no clearance, loosen the bolts and lift the upper half of the cylinder block to visually check the marks on the lower mating surface. Among them, on the premise that the upper half of the cylinder block 10 has been buckled but the bolts on the mating surface have not been tightened, the free clearance shall not exceed the following values: inside: S≤0.02mm, outside: S≤0.05mm.

[0045] Visually check the contact marks on the lower mating surface. The blue imprints on the inner sealing surface should be continuous and the width should be no less than 30% of the width of the sealing surface. The blue imprints on the outer sealing surface may not be continuous, but the contact points should be no less than 85%.

[0046] Among them, within a distance of 10 - 15mm from the air seal flange and the tip sealing edge of the split surface, no grinding is allowed.

[0047] During the grinding process, attention should be paid to: before using a new grinding wheel, first grind it on other planes and then grind it on the formal workpiece. After the first row of lapping is completed by pulling the pattern to the lower left, proceed to the next row. Each pattern is adjacent to each other horizontally and vertically. After finding high points when applying blue oil, grind the high points and pull the pattern to the lower right. The two pulls of the pattern form a herringbone or an inverted V shape. The pattern formed during grinding should be large (the grinding wheel should be flat and the angle with the split surface should be small). The thickness of the oil application is 5 - 10μm. The specific operation of oil application is as follows: first apply oil with a blue oil-coated platform and then gently drag it on the grinding surface to apply the blue oil on the surface, and then drag it back and forth forcefully to apply it evenly.

[0048] S11. Verify by hydrostatic test.

[0049] Among them, step S11 includes: S111. Verification preparation: Add process water injection holes and pressure detection holes, install all tooling and bolts in their corresponding positions, and tighten the bolts on the joint surface according to a torque value of 840 Nm.

[0050] S112. Water injection: Inject water into the lower water injection hole until there is no air in the test liquid passing through the pressure application hole, and install the pressure gauge and pressure application equipment on the top pressure application hole; note that the top pressure application hole cannot be blocked during water injection.

[0051] S113. Pressure test: After staying in the state of being filled with water for a predetermined time without abnormal conditions, start pressurizing and maintain it, and detect whether there is any water leakage; specifically, stay in the state of being filled with water for at least 3 minutes without abnormal conditions, then start pressurizing to 1.4 bar (0.14 MPa), and stay in this state for 30 minutes S114. Depressurize and drain water; Stop the pressure equipment to let the part return to the non-pressurized state, open the water pump valve to drain water, and if water cannot be drained from the bottom, remove the bolts to let the water seep out freely.

[0052] By using the process method provided in this application, the sealed chambers of equipment meeting high-temperature requirements can be mass-produced. Such a seal is strong, and there is no need to regularly disassemble and reinstall the sealing ring. The closed chamber seal is achieved by processing the joint surface.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for processing a joint surface, the joint surface is used for sealing and matching of two upper and lower semi-enclosed cylinder bodies, the joint position of the upper and lower cylinder bodies is a flange structure, and fasteners are used to cooperate with each other to tighten; The method comprises the following steps: S1, datum conversion, including welding auxiliary process datum blocks around the joint surface, and adding pads on the opposite side of the cylinder joint surface; S2. Marking: Mark the upper and lower cylinder bodies in pairs, and use the center lines of the parts as reference datums; S3, rough milling and semi-finishing milling of the upper and lower cylinder bodies; S4, the connection holes of the upper and lower cylinders assigned by the fitter; S5, drilling threaded holes on the connection surface; S6, milling and drilling the positioning pin holes on the joint surface; S7. Fine milling of the upper and lower cylinder bodies, and fine milling of the joint surface to the requirements of the drawing; S8. The upper and lower cylinder bodies are processed by benchwork, burrs are removed, sharp corners are blunted, workpieces are cleaned, part numbers are made, and anti-rust oil is applied; S9, preliminary joint surface inspection; S10, grinding the joint surface, cleaning the joint surface of the cylinder body and grinding the upper and lower cylinder bodies respectively; S11. Water pressure test verification.

2. The bonding surface processing method according to claim 1, characterized in that: In step S1, the welding of the auxiliary process reference block is used to complete the alignment of the parts and confirm the reference; the addition of the pad is used to improve the leveling effect of the blank surface.

3. The bonding surface processing method according to claim 1, characterized in that: Step S3 includes: S31, the cylinder body is placed on the adjustment pad with the side of the cylinder facing upward and the joint surface facing the gantry, and the workpiece is aligned according to the blank inspection data and the marked line; S32, turn on the right-angle milling head, with the spindle facing the pad reference surface, and cut the pad reference surface in one go when there is light; S33, right-angle milling head rotates 180°, with the spindle facing the joint surface; rough milling the joint surface; S34. Turn over, place the block with the reference surface facing downward on shims of equal height, pull out paper to check the contact, level it according to surface A, straighten it according to the line, tighten it evenly, semi-finish mill the joint surface, and process the joint surface connecting holes according to the coordinate dimensions to the requirements of the drawing.

4. The bonding surface processing method according to claim 1, characterized in that: Step S4 includes: S41. Place the bottom of the lower cylinder flat on the assembly platform, level it according to the center plane, and then place the upper cylinder. Adjust the upper cylinder, requiring the contour misalignment of the upper and lower cylinders to be ≤2mm. Cooperate with the marking worker to mark and check the machining allowance of each surface of the upper and lower cylinders. S42. Cooperate with the marking worker to assign screw hole position lines according to the positions of the processed holes on the upper cylinder.

5. The bonding surface processing method according to claim 1, characterized in that: Step S5 includes: machining threaded holes using a gantry milling machine according to the hole positions numbered in step S4.

6. The bonding surface processing method according to claim 1, characterized in that: Step S6 includes: S61. Place the bottom of the lower cylinder downward with one side facing the gantry on the same height pads, pull out paper to check the contact, align it according to the line, and tighten it evenly; S62. Process the pin holes according to the matching position as required by the drawing.

7. The bonding surface processing method according to claim 1, characterized in that: Step S7 includes: S71. Place the block with the reference surface facing downward and one end facing the gantry on the shim of equal height. Check the contact by drawing paper. Level the joint surface within 0.1mm, straighten it according to the line, and tighten it evenly. S72. Fine mill the mating surface to the requirements of the drawing to ensure the wall thickness of the mating surface.

8. The bonding surface processing method according to claim 1, characterized in that: Step S9 includes: S91. Apply blue oil to the joint surface of the upper cylinder with an oil film thickness of 6 to 7 μm. Put the upper and lower cylinders together in a free state and use a feeler gauge to check. S92. Tighten and then loosen the fasteners, disassemble the upper and lower cylinders and observe the blue oil contact condition of the lower cylinder.

9. The bonding surface processing method according to claim 1, characterized in that: Step S10 includes: S101. Clean the joint surface of the cylinder body and wipe it clean with a soft cloth; S102. Use a roller brush coated with blue oil to evenly apply blue oil on the surface of the cast iron platform; S103, use the platform and the cylinder body to push and grind the joint surface, starting from the largest point and gradually expanding to the surrounding areas; S104, polishing the upper and lower cylinder bodies respectively according to the process requirements. S105. After the upper and lower cylinder bodies are ground, turn over the upper cylinder to clean the joint surface first, then evenly apply blue oil on the joint surface with a roller brush, and then turn over the cylinder to check the grinding effect.

10. The bonding surface processing method according to claim 1, characterized in that: Step S11 includes: S111, verification preparation, adding process water injection holes and pressure detection holes, and installing all tooling, bolts, to the corresponding positions; S112, water injection, inject water into the lower water injection hole until no air in the test liquid passes through the pressure hole, and install the pressure gauge and pressure equipment to the top pressure hole; S113, pressure test, after the water is filled and stays in a predetermined time without abnormal conditions, start pressurizing and maintain. , detect whether there is water leakage; S114. Reduce pressure and drain water.

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