Multi-roll rack plum hole finishing method, plum hole standard template manufacturing method and plum hole grinding method

Abstract

A kind of multi-roll frame plum blossom deep hole finishing method, the manufacturing method of plum blossom hole standard template and the grinding method of plum blossom hole, it is related to mechanical processing manufacturing field, and the finishing method of multi-roll frame plum blossom deep hole includes the following steps: providing plum blossom hole standard template;By plum blossom hole standard template, the boring of workpiece is aligned, and then the machining of plum blossom hole corresponding to plum blossom hole standard template is carried out on workpiece.

Description

Technical Field

[0001] This invention relates to the field of mechanical processing and manufacturing, and more specifically, to a method for precision machining of deep holes in a multi-roller frame, a method for making a standard template for the holes, and a method for grinding the holes. Background Technology

[0002] In a multi-roll mill project, the mill stand is a single casting. Compared to traditional open-type mill stands, the cavity space within the closed perforated pattern is smaller. The requirements for the positional accuracy of the parallel holes in the 8-R177.8H7 perforated pattern, the positional accuracy between the holes and the datum plane, and the dimensional and positional accuracy of the holes themselves are very high. Specific requirements are as follows (see...). Figure 1 (Diagram of precision machining of plum blossom holes).

[0003] 1. Size requirements

[0004] Plum blossom hole diameter: 8-R177.8H7;

[0005] Plum blossom hole depth: 1150mm;

[0006] 2. Surface requirements: Ra0.8.

[0007] 3. Geometric accuracy

[0008] Cylindricity of a single hole ≤ 0.01 mm;

[0009] The parallelism of the 8-hole axis is ≤0.02mm;

[0010] The symmetry of the 8 holes about the centerline is ≤0.04mm;

[0011] The parallelism between the 8-hole axis and the external reference surface is ≤0.08mm; the perpendicularity is ≤0.08mm.

[0012] Based on the structural characteristics and design requirements of the workpiece, the company's high-precision RAPID6 CNC floor-type boring and milling machine was selected for machining. The machine's square slide ram cross-section is 400mm×400mm, which is greater than the radius of the plum blossom hole R177.8H7. During machining, the square slide ram cannot be inserted into the cavity of the plum blossom hole, so boring can only be performed using a φ160 diameter boring bar with overhang. The existing machining technology is as follows:

[0013] Turning the machine around for boring changes the length of the hole to a length. During the machining process, the overhang of the boring bar can be shortened by half, resulting in good rigidity and high machining efficiency. However, the rotary table that is matched with the equipment has low rotational accuracy. After turning the machine around for boring, the axes of the holes at both ends cannot be perfectly coincided, resulting in significant coaxiality error and making it difficult to guarantee the cylindricity requirement of 0.01mm.

[0014] The suspension boring machining, since the RAPID6 numerical control floor boring and milling machine square slide block section size 400mm*400mm>mei flower hole R177.8H7 is selected, the square slide block cannot be stretched into the mei flower hole cavity when machining, and can only be suspended and bored by the diameter φ160 boring bar, the longest boring bar needs to be suspended about 1200mm when machining, the length-diameter ratio (L / D) reaches 7.5, the tool itself vibration and deflection deformation at the tool tip during boring cannot meet the single mei flower hole cylindricity 0.01mm precision requirement, and it is impossible to realize by machine tool precision.

[0015] The eccentric boring and milling machining has the advantages that the square slide block can be stretched into the hole, and the steel is good, but the existing equipment of the company needs to be configured with an eccentric milling head, and the manufacturing cost is increased by configuring machine tool accessories. In the single-piece small-batch production stage, the development of tooling and suitable process methods, and the use of existing equipment machining are the key to reduce the manufacturing cost;

[0016] The high-precision boring and milling machine is used, the machine tool precision needs to be 1-2 levels higher than the workpiece precision, the domestic suitable large-scale precision boring and milling machine resources are limited, the external equipment machining cost is relatively high, and the manufacturing period cannot be controlled. SUMMARY

[0017] The purpose of the present application is to provide a multi-roller frame mei flower deep hole finishing method, a mei flower hole standard template manufacturing method and a mei flower hole grinding method, which can realize the production demand of low-precision machine tool machining high-precision mei flower hole.

[0018] The embodiment of the present application is implemented as follows:

[0019] In a first aspect, the present application provides a multi-roller frame mei flower deep hole finishing method, comprising the following steps:

[0020] A mei flower hole standard template is provided.

[0021] The workpiece is machined with the mei flower hole corresponding to the mei flower hole standard template through the mei flower hole standard template on the workpiece.

[0022] In some embodiments, the number of mei flower hole standard templates is two, and the two mei flower hole standard templates are respectively fixed on the opposite end surfaces of the workpiece.

[0023] In some embodiments, the mei flower hole standard template is screwed and fixed on the opposite end surfaces of the workpiece by bolts.

[0024] In some embodiments, the six degrees of freedom of the mei flower hole standard template relative to the workpiece are limited.

[0025] In some embodiments, during the machining of the workpiece, the relative displacement change between the star-shaped hole standard template and the workpiece is controlled.

[0026] In the second aspect, the application provides a manufacturing method of a star-shaped hole standard template. In some embodiments, a 45# quenched and tempered steel plate is selected to manufacture the star-shaped hole standard template.

[0027] In some embodiments, the number of the star-shaped hole standard templates is two, and the two star-shaped hole standard templates are simultaneously machined and formed, and the shapes and the size precision of each hole of the two star-shaped hole standard templates are completely consistent.

[0028] In some embodiments, the method further comprises the step of performing precision inspection on the star-shaped hole standard template according to the design requirements by a three-coordinate detection device.

[0029] In the third aspect, the application provides a star-shaped hole grinding method, which comprises the following steps:

[0030] providing a grinding rod;

[0031] grinding the star-shaped hole by the grinding rod.

[0032] In some embodiments, the grinding rod is made of cast iron material, and a spiral chip groove is formed on the surface of the grinding rod, and handles are screwed on both ends of the grinding rod. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 It is a schematic diagram of existing star-shaped hole finishing;

[0035] Figure 2 It is a schematic diagram of the structure of the star-shaped hole standard template provided by the embodiments of the application;

[0036] Figure 3 It is a schematic diagram of the machining of the reference surface before fine boring provided by the embodiments of the application;

[0037] Figure 4 It is a schematic diagram of the structure of the grinding rod provided by the embodiments of the application. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] 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 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 work are within the scope of protection of the present application.

[0040] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that 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 present 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. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0043] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, 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; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] Please refer to Figures 2 to 4, The frame in this project is an integral casting. Compared with the traditional open frame, the closed quill hole cavity space structure is smaller, and the company precision is higher. The square ram cross section size of the numerical control floor type boring and milling machine RAPID6 suitable for processing is 400mmx400mm>quill hole R177.8H7. The square ram cannot extend into the quill hole cavity, and only a boring bar with a diameter of The boring bar needs to be suspended for about 1200mm in the longest processing, and the length-diameter ratio (L / D) reaches 7.5. The tool itself vibration and deflection at the tool tip during the boring process cannot meet the single quill hole cylindricality 0.01mm precision requirement. In addition, the hole distance size and shape accuracy between the parallel hole systems of the 8-R177.8H7 quill hole are much higher than the machine tool accuracy requirement. It is impossible to achieve the requirement by relying on the machine tool accuracy.

[0045] In order to meet the high-precision machining requirements of the quill hole parallel hole system in the multi-roller mill frame and reduce the dependence of high-precision products on finishing equipment, a practical and effective process method is developed, and a special tooling is designed and manufactured to achieve high-precision product machining requirements using the existing low-precision machine tool. The main process method is as follows:

[0046] A special "quill hole standard template" is designed to align the boring hole according to the standard template, reducing the influence of machine tool geometric error on the precision of the machined part.

[0047] 1) Function of quill hole standard template

[0048] According to the national standard and the machine tool acceptance standard in the factory, the precision of RAPID6 boring machine is as follows:

[0049] Positioning accuracy (referring to GB / T5289.3-2006)

[0050] X-axis: <0.02 / 1000, <0.05 / full length.

[0051] Y-axis: <0.02 / 1000, <0.03 / full length.

[0052] Z-axis: <0.02 / 1000, <0.025 / full length.

[0053] Repositioning accuracy: X / Y / Z axis: <0.015 (referring to GB / T5289.3-2006);

[0054] Reverse difference: <0.01 (referring to GB / T5289.3-2006).

[0055] From the above data, it can be seen that the machine tool spindle accuracy, positioning accuracy, repositioning accuracy and reverse difference are far lower than the machining precision requirements of single hole cylindricality ≤0.01mm and 8-hole axis parallelism ≤0.02m. Obviously, the boring hole by machine tool coordinate positioning method cannot meet the requirements.

[0056] The main functions of the "quincunx hole standard template" are as follows:

[0057] ①Solve the dependence of large high-precision products on high-end finishing equipment. The precision requirements of the parts to be machined are simulated as standard templates. Since the template size is much smaller than the workpiece, the range of finishing equipment that can be selected is wider, and three-coordinate detection equipment can also be used for detection. The production precision of the template is safe and reliable; ②Solve the problem of online detection of large workpieces. In this project, the rack size is 2150*2225*1750, and the net weight is 34 tons. It is very difficult to use laser tracker and other equipment to detect the position error between the quincunx hole parallel hole system online. However, the relatively small tooling template can be machined and detected by high-precision equipment. During the semi-finishing and finishing stages of the workpiece, the online detection can be realized by comparing the template in real time; ③Solve the technical problem of large machine tool geometric error and quincunx hole spacing precision that cannot be guaranteed. When boring, only the power and movement of low-precision machine tools are used, and the center of the machine tool spindle is adjusted according to the hole position of the "quincunx hole standard template". The precision of the template is borrowed to ensure the hole spacing precision.

[0058] 2) Design description of "quincunx hole standard template"

[0059] The design diagram of "quincunx hole standard template" is shown in Figure 2 The design requirements are as follows: ①The standard tooling template serves as the positioning reference and measurement reference during part machining. The size precision and hole position precision are one grade higher than the precision of the quincunx hole to be machined. ②One-face-two-pin positioning is adopted between the tooling template and the workpiece to limit six degrees of freedom, meet the six-point positioning principle, and ensure the assembly precision of the tooling template and the workpiece. ③Two hinge holes are designed in the four holes that are combined with the workpiece to ensure that the tooling template and the workpiece do not move during machining, so that there is an accurate and fixed position relationship between the tooling template and the workpiece.

[0060] 3) Production description of quincunx hole standard template

[0061] ①Two pieces of 45# quenched and tempered steel plates are selected. One is connected to the boring-in end of the workpiece through bolting, and the other is connected to the boring-out end of the workpiece through bolting. The blank size is 1400*1260*55.

[0062] ②High-precision numerical control milling machines are selected for production according to the design requirements of the quincunx hole standard template. Two pieces are machined at the same time to ensure that the size and hole size precision of the two pieces are completely consistent.​​

[0063] ③ Use a coordinate measuring machine to inspect the accuracy of the plum blossom hole standard template according to the design requirements.

[0064] ④ The 4- connection with the workpiece Two in the hole For reaming holes, it is necessary to calibrate the hole positions at both ends of the template on a CNC gantry milling machine so that the reference surfaces are aligned and the holes at the boring end and boring in end are coaxial. Only then can two reaming holes be made. And install the reamed hole bolts to close it.

[0065] 2. Establish a high-precision datum surface and use the "precision" process method to correct the longitudinal movement error and rotation positioning error of the machine tool rotary table, thereby reducing the cylindricity error of a single hole.

[0066] 1) Requirements and methods for machining the base surface before precision boring

[0067] ①According Figure 3 "Diagram of Precision Boring Reference Surface Machining": A CNC gantry milling machine is used to machine the process side reference surface "F" and the upper reference surface "H" along the entire length of the machine frame, making them parallel to the axis of the hole to be machined. The flatness requirement is 0.01mm / 1200mm, and the perpendicularity requirement is 0.01mm / 1200mm. If the milling machine accuracy cannot meet the machining requirements, a standard plate can be used for verification. The high-precision error compensation technology is used in the program to correct the accuracy of the reference surface shape and position to meet the requirements.

[0068] ②According Figure 3 "Diagram of Precision Boring Reference Surface Machining" describes the machining of the "Plum Blossom Hole Standard Template" mounting base surface on the workpiece end face using a CNC gantry milling machine. The workpiece entry end face K, angle ruler surfaces K1 and K2 (2mm deep) are precision milled, and the entry end face L, angle ruler surfaces L1 and L2 (2mm deep) are precision milled, ensuring that the flatness of the K / L base surfaces is better than 0.02mm, and that their parallelism and perpendicularity are better than 0.02mm.

[0069] ③ Install the "plum blossom hole standard template" at the workpiece's boring end, ensuring its datum surface E is flush with the workpiece's K end face and close to the workpiece's angle surfaces K1 and K2, and pre-tighten it with bolts; similarly, install the "plum blossom hole standard template" at the workpiece's boring end, ensuring its datum surface E is flush with the workpiece's L end face and close to the workpiece's angle surfaces L1 and L2, and pre-tighten it with bolts. After rough calibration on the machine tool to ensure the parallel holes of the "plum blossom hole standard templates" at both ends are coaxial and their axes are parallel to the side datum surfaces, verify with a mandrel that there are no errors, and then assemble 2- Ream the hole and pre-tighten it with a reamed hole bolt.

[0070] ④ Use a crane to lift and move the workpiece to the boring machine.

[0071] 2) Fixture requirements and machining methods for precision boring of workpieces

[0072] Boring machine rotary table clamping workpiece, the workpiece side reference surface "F" and the upper surface "H" with the longitudinal movement of the table parallel. Fixed in the boring machine spindle end of the check micrometer, the table head light pressure on the workpiece surface "H" or "F", along with the parallel direction of the slow-moving workbench, check travel > 1150mm hole depth, according to the pointer rotation value correction workpiece position, so that the workpiece two base surface "H" and "F" and the longitudinal movement of the table parallelism error 0.01mm / 1200mm.

[0073] Boring bar suspended to more than the hole depth 1150 / 2 size position, according to the standard template pressure table, find the boring shaft axis to coincide with the "waffle hole standard template" waffle hole centerline position, using the workbench driven workpiece longitudinal feed method, 8 waffle hole semi-precision, precision boring processing.

[0074] Rotary table rotation 180° angle, according to the above head before ① and ② process requirements correction and processing. Boring another end hole.

[0075] 3) to solve the main technical problems of "precision" processing method

[0076] ① In the precision boring, with the help of the side surface "F" and the upper surface "H" of the precision milling on the gantry milling machine, the workpiece clamped on the boring machine rotary workbench is corrected to correct the inclination angle and Y-axis linear value deviation generated by the workbench tilt during boring. When boring, the workpiece is corrected according to the same side surface "F / H". After boring, the workbench moving direction is still parallel to the base surface, which meets the reference uniformity principle, and the positioning error of the rotary table rotation 180° angle is corrected, so that the coaxiality of the boring hole is guaranteed.

[0077] ② Using the workbench feed instead of the spindle feed boring can eliminate the deflection error generated by the continuous elongation of the boring bar.

[0078] ③Reversing boring processing method, change long hole to short hole, shorten the length of boring bar by 1000mm, the length-diameter ratio (L / D) is reduced from 7.5 to 3.25. The advantages of boring process are as follows: a. Good steel property of boring bar, high processing efficiency, and reduce tool chatter in boring process. b. Small radial runout of boring shaft, good hole cylindricity. According to national standards and machine acceptance standards, the radial runout of RAPID6 boring machine is <0.015mm, 0.02mm / 300mm. According to the experience of long-term processing, the radial runout error of boring bar is about 0.08mm at 1200mm position. Obviously, it meets the requirement of 0.01mm for some petal hole cylindricity. The use of counter-boring processing can reduce the length-diameter ratio, and the use of damping tool bar can ensure the radial runout <0.02mm / 600mm, and the hole cylindricity <0.04mm / 1200mm.

[0079] ④Make "petal hole standard template", and only need to move the boring shaft axis to the center line of "petal hole standard template" to process the boring. The main advantages are as follows: a. The position accuracy of the processed hole is completely determined by the position accuracy of the hole of "petal hole standard template", and is independent of the machine accuracy. It can use low-precision machine to process high-precision products. b. Compared with the conventional boring method using coordinate method, this method is safer and simpler, and the technical level of workers is relatively low. During processing, only need to press the template to find the center. However, the conventional coordinate boring method needs program verification before finishing, and high-precision online detection equipment for actual measurement. Then, according to the actual situation, analyze and calculate to compensate the error. For the machine with unstable geometric accuracy, the coordinate boring method has certain risk. c. The size of "petal hole standard template" is much smaller than that of the workpiece. It can be processed and manufactured by high-precision equipment and detected by three-coordinate detection equipment. The accuracy of the manufactured template is reliable. It can solve the technical problem of online detection of large workpieces by using the template to detect the workpiece in real time.

[0080] 3. Use "grinding rod" to finish the petal hole system, eliminate the 0.04mm coaxiality error caused by tool setting, and improve the surface roughness of single hole in intermittent boring process. Figure 4 Grinding rod schematic diagram

[0081] Function of special "grinding rod"

[0082] "Grinding rod" is a kind of abrasive cutting processing method that grinds a very thin layer of metal from the workpiece based on finishing. The use of this method to finish the petal hole system can improve the coaxiality error of the finished boring hole from 0.04mm to 0.01mm, and improve the surface roughness of the finished boring hole from Ra1.6 to Ra0.8. The accuracy and surface quality of the petal hole system meet the design requirements.

[0083] 2) Design of special grinding rod

[0084] The design of the special grinding rod is as follows, and the design requirements are as follows: ① The outer diameter is smaller than the actual measured size of the workpiece by 0.01-0.025mm, and a spiral chip groove (1) is formed on the surface for convenient chip removal during grinding. ② HT200 cast iron material is selected for manufacturing, which can ensure excellent shock absorption and high wear resistance of the grinding rod, and the size is stable during grinding. ③ Threaded holes are designed on both ends for installing handles (2), so that the grinding rod can move forward and backward and slowly rotate.

[0085] 1. The main effects of using the standard sample plate of plum blossom hole are as follows:

[0086] The "standard sample plate of plum blossom hole" is used as the reference for correcting the position of the main shaft during boring, and the accuracy of the processed hole depends entirely on the accuracy of the tooling template, which can meet the demand for processing high-precision products on low-precision machines.

[0087] Compared with the conventional coordinate method of boring, the "standard sample plate of plum blossom hole" is safer and more convenient to correct the workpiece, and the technical level of the workers is relatively low, which avoids the potential risks of coordinate boring when the geometric accuracy of the machine is unstable.

[0088] The "standard sample plate of plum blossom hole" can be used as a measurement reference during online processing to control the size of the plum blossom hole during semi-precision and precision processing, and realize online detection.

[0089] 2. The main technical effects of using the "precision" processing method are as follows:

[0090] ① By processing a long base surface on the workpiece, the longitudinal movement deviation and the positioning error of the rotary table during boring are corrected by using the "precision" of the base surface, which improves the cylindricity of the bored hole and the coaxiality of the boring.

[0091] ② By using the boring method, the workpiece is corrected according to the long base surface that has been processed on the workpiece, and the positioning error of the rotary table during boring is corrected by following the reference unification principle, which improves the coaxiality of the boring. The variable boring length hole can be changed to a short hole, and the suspension of the boring bar can be shortened by half, from the original 1200mm to 600mm, and the length-diameter ratio (L / D) is reduced from 7.5 to 3.25, which can ensure that the radial runout of the boring shaft is reduced from 0.08mm / 1200mm to <0.02mm / 600mm, and the cylindricity of the bored hole is <0.04mm / 1200mm.

[0092] 3. Technical effects of using a special grinding rod

[0093] By using a special "grinding rod" to finely grind the plum blossom holes, the coaxiality error of the precision boring holes can be improved from 0.04mm to 0.01mm, and the surface roughness can be improved from Ra1.6 to Ra0.8, so that the accuracy and surface quality of the plum blossom hole parallel hole system meet the design requirements.

[0094] 1. Main function and brief explanation of the standard template for plum blossom holes:

[0095] To improve the precision of high-precision workpieces, such as the plum blossom holes, a "standard tooling template" can be created by raising the precision level. The boring can be aligned according to the template, and the machining accuracy is independent of the geometric error of the machine tool. This allows high-precision products to be processed using low-precision machine tools.

[0096] During the processing, the sample can be compared in real time to control the size and position accuracy of the plum blossom holes in the semi-finishing and finishing stages, thus solving the problem of online inspection of large workpieces.

[0097] The one-sided two-pin positioning method satisfies the six-point positioning principle, ensuring an accurate and definite positional relationship between the tooling template and the workpiece.

[0098] 2. A process method for correcting the longitudinal movement error and rotation positioning error of a machine tool rotary table by using "precision".

[0099] 1) Press Figure 3 "Diagram of machining reference surfaces before precision boring": The process side reference surface "F" and the upper reference surface "H" are machined along the entire length of the machine frame using a CNC gantry milling machine. The "plum blossom hole standard template" mounting reference surfaces K / K1 / K2 and L / L1 / L2 are machined on the end face of the workpiece to ensure that each reference surface meets the accuracy requirements.

[0100] 2) Install “plump-blossom hole standard templates” at both ends of the workpiece, and align them closely with the base surfaces K / K1 / K2 and L / L1 / L2 respectively, and tighten the bolts.

[0101] 3) After ensuring that the parallel holes of the "plum blossom hole standard templates" at both ends are coaxial and their axes are parallel to the side reference plane, then fit them together with 2- Ream the hole and pre-tighten it with a reamed hole bolt.

[0102] 4) Use a crane to move the workpiece to the boring machine.

[0103] 5) Clamp the workpiece on the rotary table of the boring machine and check that the longitudinal movement of the table is parallel to the workpiece side reference surface "F" and the upper reference surface "H".

[0104] 6) When the boring bar is extended to a position exceeding the hole depth by 1150 / 2, it is aligned with the pressure gauge according to the "standard template for plum blossom holes". The workpiece is then fed longitudinally by the worktable to perform semi-finish and finish boring of the eight plum blossom holes.

[0105] 7) Rotate the rotary table 180° and, according to the requirements of steps 5) and 6) above, bore the hole at the other end.

[0106] 3. Special grinding rod

[0107] 1) The design requirements for a special grinding rod are as follows: ① Outer diameter The grinding rod is 0.01-0.025mm smaller than the actual measured size of the workpiece, and has a spiral chip groove (1) machined on the surface to facilitate chip removal during grinding. ② It is made of HT200 cast iron material, which can ensure that the grinding rod has excellent shock absorption and high wear resistance, and the dimensions are stable during grinding. ③ Threaded holes are designed on both ends for installing handles (2), so that the grinding rod can move back and forth and slowly flip.

[0108] 2) The "grinding rod" is used as the final finishing tool to grind away a very thin layer of metal from the workpiece with abrasive to finish the plum blossom hole, thereby improving the coaxiality error of the fine boring hole from 0.04mm to 0.01mm and the surface roughness of the fine boring hole from Ra1.6 to Ra0.8. This eliminates the coaxiality error after tool setting and improves the surface roughness of a single hole during intermittent boring.

[0109] To ensure product quality and meet various technical requirements, the workpiece needs to undergo multiple processes, including rough machining, flaw detection, finishing and welding repair, stress-relieving tempering, semi-finishing, flaw detection, and finishing. This invention primarily provides a process technology method for ensuring dimensional and positional accuracy during the finishing of a perforated hole after all processes before finishing are completed, leaving a 3mm allowance on one side of the workpiece. The specific implementation method is as follows:

[0110] 1. Make a standard template for plum blossom holes.

[0111] ① Two pieces are made from 45# quenched and tempered steel plates, with a blanking size of 1400*1260*55.

[0112] ② Select a high-precision CNC milling machine and manufacture according to the design requirements of the plum blossom hole standard template. Process two pieces at the same time to ensure that the shape and hole size of the two pieces are completely consistent.

[0113] ③ Use a coordinate measuring machine to inspect the accuracy of the plum blossom hole standard template according to the design requirements.

[0114] 2. According to the "Machining Schematic Diagram of the Precision Boring Reference Surface", use a CNC gantry milling machine to machine the process side reference surface "A" and the upper reference surface "B" along the entire length of the machine frame, making them parallel to the axis of the hole to be machined. The flatness requirement is 0.01mm / 1200mm, and the perpendicularity requirement is 0.01mm / 1200mm. If the milling machine accuracy cannot meet the machining requirements, a standard plate can be used for verification. The high-precision error compensation technology can be used in the program to correct the accuracy of the reference surface shape and position to meet the requirements.

[0115] 3. According to the processing diagram of the "processing of the reference surface before fine boring", the installation base surface of the standard sample plate of the plum blossom hole is processed by using the numerical control planer milling machine. The end face C, the angle ruler surface C1 and C2 are fine milled at the boring-in end, and the end face D, the angle ruler surface D1 and D2 are fine milled at the boring-out end, so that the shape and position accuracy of each base surface meets the requirements.

[0116] 4. The standard sample plate of the plum blossom hole is hoisted at the boring-in end and the boring-out end of the workpiece respectively, so that the reference surface of the sample plate is tightly and flatly contacted with the end base surface of the workpiece to be processed, the bolts are combined, the machine tool is checked after the sample hole positions at the boring-in end and the boring-out end are basically coaxial and the axis is parallel to the side reference surface, then the coaxiality of the two end holes is checked by using the mandrel, and the two holes are matched. The holes are reamed, and the reaming hole bolts are pre-tightened.

[0117] 5. The workpiece is hoisted by the travelling crane and is moved to the boring machine.

[0118] 6. Fine boring processing

[0119] ①The workpiece is clamped on the rotating worktable of the boring machine, so that the side reference surface "A" and the upper base surface "B" of the workpiece are parallel to the longitudinal movement of the worktable. The dial gauge is fixed at the end of the main shaft of the boring machine, and the probe is lightly pressed on the base surface of the workpiece. The worktable is slowly moved in the direction parallel to the boring axis, the checking stroke is greater than 1150mm, the position of the workpiece is corrected according to the rotation value of the pointer, and the parallelism error between the two base surfaces of the workpiece and the longitudinal movement of the worktable is within 0.01mm / 1200mm.

[0120] ②The boring bar is suspended to a position exceeding the hole depth by 1150 / 2, the circle is found by using the "standard template of the plum blossom hole", the boring axis is moved to the position where the boring axis is coincided with the center line of the plum blossom hole on the tooling template, the method of longitudinal feeding of the workpiece by the worktable is adopted, and the semi-fine and fine boring of the eight plum blossom holes is carried out.

[0121] ③The rotating worktable is rotated by 180°, and the above-mentioned methods of ① and ② are used for correction and processing, and the other end hole is bored.

[0122] 7. Fine grinding processing

[0123] The plum blossom holes are fine ground by using the special "grinding rod" to move forward and backward and slowly rotate, so that the coaxiality error of the fine bored hole is increased from 0.04mm to 0.01mm, the surface roughness is increased from Ra1.6 to Ra0.8, and the precision and surface quality of the plum blossom holes meet the design requirements.

[0124] The above only describes the preferred embodiments 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 modifications and changes. Any modification, equivalent replacement, improvement, etc. 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 finishing a multi-roll stand Wobbler deep hole, characterized by, It comprises the following steps: Providing a standard template of a quincunx hole; After the quincunx hole standard template is used to align the boring hole on the workpiece, the workpiece is processed with the quincunx hole corresponding to the quincunx hole standard template; The step of processing the workpiece with the quincunx hole corresponding to the quincunx hole standard template after the quincunx hole standard template is used to align the boring hole on the workpiece comprises: Using a numerical control planer to process the side base surface and the upper base surface of the workpiece to be parallel to the axis of the hole to be processed; Using a numerical control planer to process the installation base surface of the quincunx hole standard template on the end surface of the workpiece, and to precisely mill the end surface, the angle ruler surface K1 and the angle ruler surface K2 on the boring-in end of the workpiece, and to precisely mill the end surface, the angle ruler surface L1 and the angle ruler surface L2 on the boring-out end; Hoisting the quincunx hole standard template on the boring-in end of the workpiece so that the reference surface of the quincunx hole standard template is parallel to the end surface of the boring-in end of the workpiece, and the quincunx hole standard template is tightly fitted with the angle ruler surface K1 and the angle ruler surface K2 of the workpiece, and the quincunx hole standard template is fastened with bolts; similarly, hoisting the quincunx hole standard template on the boring-out end of the workpiece so that the reference surface of the quincunx hole standard template is parallel to the end surface of the boring-out end of the workpiece, and the quincunx hole standard template is tightly fitted with the angle ruler surface L1 and the angle ruler surface L2 of the workpiece, and the quincunx hole standard template is fastened with bolts; after the parallel hole system of the quincunx hole standard template on the two ends of the workpiece is coaxial and the axis of the parallel hole system is parallel to the side base surface of the workpiece, the workpiece is moved to the boring machine, and the coaxiality of the parallel hole system is verified with a mandrel; the quincunx hole standard template is assembled and fastened with bolts; Using a crane to move the workpiece to the boring machine, clamping the workpiece on the rotating table of the boring machine, and making the side base surface and the upper base surface of the workpiece parallel to the longitudinal movement of the table; fixing a verification micrometer on the end of the main shaft of the boring machine, and lightly pressing the head of the micrometer on the upper base surface or the side base surface of the workpiece; slowly moving the table in the direction parallel to the axis of the quincunx hole, verifying that the travel of the micrometer is greater than the depth of the quincunx hole, and correcting the position of the workpiece according to the number of rotations of the pointer so that the side base surface and the upper base surface of the workpiece are parallel to the longitudinal movement of the table within an error of 0.01mm / 1200mm; Extending the boring bar to a position beyond one-half of the depth of the hole, aligning the boring bar axis with the center line of the quincunx hole of the quincunx hole standard template, and using the table to drive the workpiece to longitudinally feed to process the eight quincunx holes to semi-finish and finish boring; Rotating the table by 180°, and correcting and processing the other end hole according to the above steps.

2. The method of finishing a multiple roll gang wreath deep hole according to claim 1, wherein, The number of the quincunx hole standard templates is two, and the two quincunx hole standard templates are respectively fixed on the opposite end surfaces of the workpiece.

3. The method of finishing a multiple roll gang wreath deep hole according to claim 2, wherein, The quincunx hole standard templates are fixed on the opposite end surfaces of the workpiece by bolts.

4. The method of finishing a multiple roll gang wreath deep hole according to claim 1, wherein, The six degrees of freedom of the quincunx hole standard templates relative to the workpiece are limited.

5. The method of finishing a multiple roll gang wreath deep hole according to claim 4, wherein, During the processing of the workpiece, the relative displacement between the quincunx hole standard templates and the workpiece is controlled.

6. A method of manufacturing a standard template for a WPH according to claim 1, characterized in that, The quincunx hole standard templates are made of 45# quenched and tempered steel plate.

7. The method of claim 6, wherein the plurality of holes are arranged in a pattern of a plurality of rows and columns. The number of the quincunx hole standard templates is two, and the two quincunx hole standard templates are simultaneously processed and formed, and the shapes and the dimensional accuracy of the two quincunx hole standard templates are completely consistent.

8. The method of claim 7, wherein the plurality of holes are formed in a plurality of rows, and the plurality of rows are formed in a plurality of columns. The quincunx hole standard templates are also subjected to precision inspection by a three-coordinate detection device according to the design requirements.

9. A method of reaming a star hole as claimed in claim 1, wherein, It comprises the following steps: Providing a grinding rod; The plum blossom hole is ground by the grinding rod.

10. The method of claim 9, wherein, The grinding rod is made of cast iron material, has helical gash formed on the surface, and has handles screwed on both ends.

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