Diesel engine crankshaft inner flange drilling tool and method

Abstract

The invention discloses a tool and method for drilling holes in the inner flange of a diesel engine crankshaft. The tool comprises a positioning assembly, a drilling jig assembly, a magnetic drill support seat and a magnetic drill. The drilling jig assembly is clamped and fixed on two crankshaft reference shoulders, the magnetic drill support seat is clamped and fixed on the outer circle on the other side of the inner flange, and the magnetic drill is fixed on the side of the magnetic drill support seat facing the free end outer flange. The drilling jig assembly comprises two semi-ring bodies, the upper and lower semi-ring bodies are clamped and fixed on the two crankshaft reference shoulders close to the free end outer flange, and the fixed bushing and a plurality of fixed drill sleeves are fixed on the two semi-ring bodies at intervals. The method comprises: 1) the diesel engine crankshaft is supported on the positioning assembly, 2) the drilling jig assembly and the magnetic drill support seat are installed, and 3) all holes on the inner flange are processed. The invention significantly improves the processing quality and processing efficiency, reduces the consumption cost of the tool, and reduces the processing time. The labor intensity of the workers is reduced and the operation safety is improved.

Description

Technical Field

[0001] The invention relates to cutting processing of key parts of a diesel engine, in particular to drilling processing of multiple end holes on an inner flange of a diesel engine crankshaft, and belongs to the technical field of metal cutting processing.

[0002] The crankshaft is a key part of a diesel engine used to transmit power, and its quality directly affects the overall performance and service life of the diesel engine. Figure 1 and Figure 2 The figure shows a seven-cylinder marine medium-speed diesel engine crankshaft, the outer circumferential size of the outer flange 10 of the right end of the connecting end is Φ506g6, the outer circumferential size of the inner flange 20 is Φ384, the outer circumferential size of the two crankshaft reference shoulders 103 is Φ285h6, the inner hole of the transmission gear is transitionally matched with the two crankshaft reference shoulders 103, a 16H7 locating pin hole 201 is provided on the upper right side of the inner flange 20, and 8 M16 threaded holes 202 are provided on the upper and lower outer edges of the right side. The position of the locating pin hole 201 coincides with the upper dead center position line of the seventh cylinder of the crankshaft, and the position accuracy of the locating pin hole 201 and the outer circumference of the two crankshaft reference shoulders 103 is Φ0.05. Among the 8 threaded holes 202 of M16 on the upper right side of the inner flange 20, the phase difference between two adjacent threaded holes 202 and between the threaded holes 202 and the positioning pin holes 201 is 12.75°, and the 8 threaded holes 202 on the lower right side of the inner flange 20 and the 8 threaded holes 202 on the upper right side of the inner flange 20 are symmetrical about the crankshaft axis. Since the outer diameter of the outer flange 10 at the connection end is larger than the outer diameter of the inner flange 20, the positioning pin holes 201 and the 16 threaded holes 202 on the right side of the inner flange cannot be directly processed by a common machine tool spindle.

[0003] For example, a special attachment head can be used to process the locating pin holes and 16 threaded holes 202 in a CNC machining center. However, due to the limited cutting phase angle of the special attachment head, the crankshaft position needs to be changed four times to complete the processing of the locating pin holes and 16 threaded holes 202. Each time the crankshaft position is changed, a series of auxiliary processes such as cumbersome alignment and establishment of the workpiece coordinate system are required, resulting in high processing costs and low production efficiency. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings, the present invention provides a diesel engine crankshaft inner flange drilling tool and method, which solves the problem that ordinary machine tool spindles cannot directly drill holes, and CNC machining centers not only have high equipment investment costs, but also have processing costs several times higher than ordinary machine tools.

[0005] The present invention is achieved through the following technical solutions:

[0006] A diesel engine crankshaft inner flange drilling tool, comprising a positioning assembly, a drilling jig assembly, a magnetic drill support seat and a magnetic drill, the positioning assembly comprising a base and a V-shaped block arranged in pairs, the base being respectively fixed on both ends of a workbench, the V-shaped blocks being respectively fixed on the base, the first main shaft diameter and the terminal main shaft diameter of the diesel engine crankshaft being respectively supported on the corresponding V-shaped blocks; the drilling jig assembly is clamped and fixed on two crankshaft reference shoulders outside one side of the inner flange adjacent to the terminal main shaft diameter, the magnetic drill support seat is clamped and fixed on the outer circle on the other side of the inner flange; the magnetic drill is placed horizontally, and the magnetic suction seat of the magnetic drill is suction-fixed on the side of the magnetic drill support seat facing the outer flange of the connecting end; the drilling jig assembly comprises two semi-ring bodies and two connecting bolt and nut groups, as well as a fixing bushing, A replaceable reaming sleeve, a replaceable rough reaming sleeve, a replaceable fine reaming sleeve and a plurality of fixed drill sleeves, the two semi-ring bodies have the same structure, clamping edges are extended outward from both ends of the semi-ring bodies respectively, the inner circle of the semi-ring bodies matches the outer circle of the two crankshaft reference shoulders outside one side of the inner flange, the clamping edges at both ends of the upper and lower semi-ring bodies are clamped and fixed by connecting bolt and nut groups respectively, so that the upper and lower semi-ring bodies are clamped and fixed on the two crankshaft reference shoulders close to the outer flange of the connecting end; drill sleeve fixing rings are radially extended from the outer edges of the two semi-ring bodies abutting against one side of the inner flange, and the fixed bushings are fixed on the drill sleeve fixing rings, and correspond to the positions of the locating pin holes of the inner flange; a plurality of fixed drill sleeves are respectively fixed on the drill sleeve fixing rings of the two semi-ring bodies at intervals, and correspond one by one to the positions of the multiple threaded holes of the inner flange.

[0007] The purpose of the present invention can be further achieved by the following technical measures.

[0008] Furthermore, the magnetic drill support seat includes two support seat semi-ring bodies and two connecting bolt and nut groups. The inner holes of the two support seat semi-ring bodies are axially provided with positioning steps. The inner circle synthesized by the two support seat semi-ring bodies is axially positioned on the other side of the outer circle of the inner flange through the positioning steps. Ear plates extend outward at both ends of the upper and lower support seat semi-ring bodies respectively. The ear plates are fixedly connected to the upper and lower support seat semi-ring bodies by the connecting bolt and nut groups, so that the two support seat semi-ring bodies are clamped and fixed on the other side of the outer circle of the inner flange.

[0009] Furthermore, an axial reference line is engraved on the outer peripheral surface of the drill sleeve fixing ring of the upper semi-ring body, and the axial reference line corresponds to the top dead center reference line on the inner flange on the end main shaft diameter side of the diesel engine crankshaft.

[0010] Furthermore, the inner circle of the semi-ring body is interference-fitted with the outer circles of two crankshaft shoulders on one side of the inner flange.

[0011] Furthermore, the position accuracy of the axis of the fixed bushing relative to the outer circle of the crankshaft reference shoulder is Φ0.02.

[0012] A method for using a diesel engine crankshaft inner flange drilling tool comprises the following steps:

[0013] 1) The diesel engine crankshaft is supported on the positioning assembly

[0014] First, fix the base to the two ends of the workbench respectively, and then support the V-shaped blocks on the base respectively, and support the first main shaft diameter and the end main shaft diameter of the diesel engine crankshaft on the corresponding V-shaped blocks respectively;

[0015] 2) Adjust the position of the diesel engine crankshaft

[0016] Turn the diesel engine crankshaft so that the top dead center reference line marked on the inner flange on the main shaft diameter side of the diesel engine crankshaft end is at the highest point;

[0017] 3) Install the drilling jig assembly

[0018] First, install a fixed bushing and multiple fixed drill sleeves on the drill sleeve fixing rings of the upper and lower semi-ring bodies, then align the two semi-ring bodies up and down, and fix the clamping edges at both ends of the aligned semi-ring bodies by connecting bolt and nut groups, so that the two semi-ring bodies are positioned on the two crankshaft reference shoulders close to the connecting end flange, and the end faces of the upper and lower semi-ring bodies are against one side of the inner flange; rotate the drilling jig assembly so that the axial reference line of the drill sleeve fixing ring of the upper semi-ring body is aligned with the top dead center reference line of the inner flange on the side of the end spindle diameter; then tighten the connecting bolt and nut groups on the clamping edges at both ends of the upper and lower semi-ring bodies respectively, so that the upper and lower semi-ring bodies are clamped and fixed on the two crankshaft reference shoulders; finally, embed the replaceable reaming sleeve into the fixed bushing;

[0019] 4) Install the magnetic drill support and magnetic drill

[0020] First, the inner circle formed by the two support seat semi-ring bodies is axially positioned on the outer circle of the inner flange through the positioning step, and then the ear plates at both ends of the upper and lower support seat semi-ring bodies are fixedly connected by connecting bolt and nut groups respectively, so that the two support seat semi-ring bodies are clamped and fixed on the outer circle of the inner flange, and then the magnetic suction seat of the magnetic drill is sucked and fixed on one side of the magnetic drill support seat;

[0021] 5) Drill multiple threaded bottom holes on the inner flange

[0022] Install the threaded hole bottom hole drill bit in the chuck of the magnetic drill, start the magnetic drill, and insert the threaded hole bottom hole drill bit into each fixed drill sleeve in turn to drill out the threaded hole bottom holes of the inner flange one by one;

[0023] 6) Complete the expansion drilling, rough reaming and fine reaming of the positioning pin hole

[0024] Replace the locating pin bottom hole drill bit, and extend the locating pin bottom hole drill bit into the replaceable reaming sleeve to complete the drilling of the locating pin bottom hole of the inner flange; then replace the reaming drill bit to complete the reaming of the locating pin bottom hole;

[0025] 7) Complete the rough and fine reaming of the positioning pin hole

[0026] Remove the magnetic drill, take out the replaceable reaming sleeve, embed the replaceable rough reaming sleeve into the fixed bushing, use the replaceable rough reaming sleeve to position, and manually rough reaming the locating pin hole; then take out the replaceable rough reaming sleeve, embed the replaceable fine reaming sleeve into the fixed bushing; use the replaceable fine reaming sleeve to position, and manually fine reaming the locating pin hole to complete the processing of the locating pin hole;

[0027] 8) Manually tap each threaded hole

[0028] Manually tap each hole one by one to complete the tapping of each threaded hole.

[0029] The present invention is easy to use and has high positioning accuracy, and solves the problem that the positioning pin holes and multiple threaded holes on the side of the inner flange of the diesel engine crankshaft cannot be directly processed by ordinary machine tool spindles. Compared with the method of using a special accessory head in a CNC machining center to perform the above-mentioned processing, which requires multiple changes in the crankshaft position, multiple alignments, and the establishment of a workpiece coordinate system, the present invention can complete the processing of all holes on the inner flange end face with only one positioning and clamping, and the processing quality is significantly improved, and the processing efficiency is improved, the consumption cost of the tool is reduced, and the processing time is reduced, thereby reducing the processing cost. It reduces the labor intensity of workers and improves operational safety. It is a new tooling and new method for processing the inner flange hole system of a diesel engine crankshaft that is worthy of promotion.

[0030] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the front view of the crankshaft of a certain type of seven-cylinder marine medium-speed diesel engine;

[0032] Figure 2 yes Figure 1 AA section view;

[0033] Figure 3 This is a front view of the tooling of the present invention installed on a diesel engine crankshaft;

[0034] Figure 4 yes Figure 3 A magnified view of part I;

[0035] Figure 5 yes Figure 3 BB enlarged cross-sectional view. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and an embodiment of drilling holes in the inner flange of a crankshaft of a certain type of seven-cylinder marine medium-speed diesel engine.

[0037] like Figure 3As shown, this embodiment includes a positioning assembly 1, a drilling jig assembly 2, a magnetic drill support seat 3 and a magnetic drill 4. The positioning assembly 1 includes a base 11 and a V-shaped block 12 arranged in pairs. The base 11 is fixed on both ends of the workbench 200 respectively, and the V-shaped block 12 is fixed on the base 11 respectively. The first main shaft diameter 101 and the seventh main shaft diameter 107 of the diesel engine crankshaft 100 are supported on the corresponding V-shaped blocks 12 respectively. The drilling jig assembly 2 is clamped and fixed on the two crankshaft reference shoulders 103 on the right side of the inner flange 20 adjacent to the seventh main shaft diameter 107, and the magnetic drill support seat 3 is clamped and fixed on the outer circle on the left side of the inner flange 20. The magnetic drill 4 is placed horizontally, and its magnetic suction seat 41 is suction-fixed on the right side of the magnetic drill support seat 3, that is, on the side facing the outer flange 10 of the connection end.

[0038] like Figure 4 and Figure 5 As shown, the drilling template assembly 2 includes two semi-ring bodies 21 and two connecting bolt and nut groups 22, as well as a fixed bushing 23, a replaceable reaming sleeve 24, a replaceable rough reaming sleeve 25, a replaceable fine reaming sleeve 26 and a plurality of fixed drill sleeves 27. The two semi-ring bodies 21 have the same structure, and clamping edges 211 are respectively extended outward from both ends of the semi-ring bodies 21. The inner circle of the semi-ring body 21 matches the outer circle of the two crankshaft reference shoulders 103 outside the right side of the inner flange 20. The clamping edges 211 at both ends of the upper and lower semi-ring bodies 21 are respectively clamped and fixed by the connecting bolt and nut groups 22, so that the upper and lower semi-ring bodies 21 are clamped and fixed on the two crankshaft reference shoulders 103 near the outer flange 10 of the connection end. The outer edges of the two semi-ring bodies 21 abutting against the right side of the inner flange 20 respectively extend radially with drill sleeve fixing rings 212, and the fixed bushings 23 are fixed on the drill sleeve fixing rings 212, and the positions of the positioning pin holes 201 of the inner flange 20 correspond to each other. A plurality of fixed drill sleeves 27 are fixed at intervals on the drill sleeve fixing rings 212 of the two semi-ring bodies 21 , respectively, and correspond one to one with the positions of the 16 M16 threaded holes 202 of the inner flange 20 .

[0039] The magnetic drill support seat 3 includes two support seat semi-ring bodies 31 and two connecting bolt and nut groups 22. The inner holes of the two support seat semi-ring bodies 31 are axially provided with positioning steps 311. The inner circle synthesized by the two support seat semi-ring bodies 31 is axially positioned on the left side of the outer circle of the inner flange 20 through the positioning steps 311. Ear plates 312 are respectively extended outward at both ends of the upper and lower support seat semi-ring bodies 31. The ear plates 312 are respectively fixedly connected to the upper and lower support seat semi-ring bodies 31 through the connecting bolt and nut groups 22, so that the two support seat semi-ring bodies 31 are clamped and fixed on the right side of the outer circle of the inner flange 20.

[0040] The two half ring bodies 21 of the drilling jig assembly 2 and the two half ring bodies 31 of the magnetic drill support seat 3 are both clamped and fixed on the diesel engine crankshaft 100, which is very convenient for quick fixing or quick removal of the drilling tool of the present invention.

[0041] An axial reference line 213 is engraved on the outer circumference of the drill sleeve fixing ring 212 of the upper half ring body 21. The axial reference line 213 corresponds to Figure 2 The top dead center reference line 104 on the inner flange 20 on the side of the seventh main shaft diameter 107 of the diesel engine crankshaft 100 shown in the figure can improve the positioning accuracy of the positioning pin hole 201.

[0042] The inner circle of the semi-ring body 21 is interference fit with the outer circles of the two crankshaft shoulders 103 on the right side of the inner flange 20. The interference fit code of this embodiment is N7 / h6, which ensures that the two semi-ring bodies 21 are stably fixed on the crankshaft shoulders 103. The position accuracy of the axis of the fixed bushing 23 relative to the outer circle of the crankshaft reference shoulder 103 is Φ0.02, which can also improve the positioning accuracy of the positioning pin hole 201.

[0043] A method for using a diesel engine crankshaft inner flange drilling tool comprises the following steps:

[0044] 1) The diesel engine crankshaft 100 is supported on the positioning assembly 1

[0045] like Figure 3 As shown, the base 11 is first fixed to both ends of the workbench 200, and then the V-shaped blocks 12 are supported on the base 11, and the first main shaft diameter 101 and the seventh main shaft diameter 107 of the diesel engine crankshaft 100 are supported on the corresponding V-shaped blocks 12.

[0046] 2) Adjust the position of the diesel engine crankshaft 100

[0047] The diesel engine crankshaft 100 is rotated so that the top dead center reference line 104 marked on the inner flange 20 on the right side of the seventh main shaft diameter 107 of the diesel engine crankshaft 100 is located at the highest point.

[0048] 3) Install the drilling jig assembly 2

[0049] First, install the fixed bushing 23 and 16 fixed drill bushings 27 on the drill bushing fixing rings 212 of the upper and lower half ring bodies 21, then align the two half ring bodies 21 up and down, and fix the clamping edges 211 at both ends of the two half ring bodies 21 after alignment by connecting bolt and nut groups 22, so that the two half ring bodies 21 are positioned on the two crankshaft reference shoulders 103 close to the connecting end flange 104, and the end faces of the upper and lower half ring bodies 21 are against the right side of the inner flange 20. Rotate the drilling jig assembly 2 so that the axial reference line of the drill bushing fixing ring 212 of the upper half ring body 21 is aligned with the top dead center reference line 104 of the inner flange 20 on the side of the seventh main shaft diameter 107 of the diesel engine crankshaft. Then tighten the connecting bolt and nut groups 22 on the clamping edges 21 at both ends of the upper and lower half ring bodies 21 respectively, so that the upper and lower half ring bodies 21 are clamped and fixed on the two crankshaft reference shoulders 103, and finally the replaceable reaming sleeve 24 is embedded in the fixed bushing 23.

[0050] 4) Install the magnetic drill support 3 and magnetic drill 4

[0051] First, the inner circle formed by the two supporting seat semi-ring bodies 31 is axially positioned on the outer circle of the inner flange 20 through the positioning step 311, and then the ear plates 312 at both ends of the upper and lower supporting seat semi-ring bodies 31 are fixedly connected by connecting bolt and nut groups 22 respectively, so that the two supporting seat semi-ring bodies 31 are clamped and fixed on the outer circle of the inner flange 20, and then the magnetic suction seat 41 of the magnetic drill 4 is sucked and fixed on the right side of the magnetic drill support seat 3.

[0052] 5) Drill the bottom holes of 16 threaded holes on the inner flange 20

[0053] The threaded hole bottom hole drill bit is installed in the chuck of the magnetic drill, and the magnetic drill 4 is started. The threaded hole bottom hole drill bit is inserted into each fixed drill sleeve 27 in turn to drill out the threaded hole bottom holes of the inner flange 20 one by one;

[0054] 6) Complete the expansion drilling, rough reaming and fine reaming of the positioning pin hole 201

[0055] Replace the positioning pin bottom hole drill bit, the positioning pin bottom hole drill bit extends into the replaceable reaming sleeve 24 to complete the drilling of the positioning pin bottom hole of the inner flange 20; then replace the reaming drill bit to complete the reaming of the positioning pin bottom hole.

[0056] 7) Complete the rough reaming and fine reaming of the positioning pin hole 201

[0057] Remove the magnetic drill 4, take out the replaceable reaming sleeve 24, embed the replaceable rough reaming sleeve 25 into the fixed bushing 23, use the replaceable rough reaming sleeve 25 to position, and manually rough reaming the positioning pin hole 201; then take out the replaceable rough reaming sleeve 25, embed the replaceable fine reaming sleeve into the fixed bushing 26, use the replaceable fine reaming sleeve 26 to position, and manually fine reaming the positioning pin hole 201, and complete the processing of the positioning pin hole 201;

[0058] 8) Manually tap each threaded hole 202

[0059] The tapping of each threaded hole 202 is completed by manually tapping each hole one by one.

[0060] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A diesel engine crankshaft inner flange drilling tool, comprising a positioning assembly, wherein the positioning assembly comprises a base and a V-shaped block arranged in pairs, the base is respectively fixed on both ends of a workbench, the V-shaped blocks are respectively fixed on the base, and the first main shaft diameter and the seventh main shaft diameter of the diesel engine crankshaft are respectively supported on the corresponding V-shaped blocks; characterized in that: It also includes a drilling jig assembly, a magnetic drill support seat and a magnetic drill, wherein the drilling jig assembly is clamped and fixed on two crankshaft reference shoulders outside one side of the inner flange adjacent to the seventh main shaft diameter, and the magnetic drill support seat is clamped and fixed on the outer circle of the other side of the inner flange; the magnetic drill is placed horizontally, and the magnetic suction seat of the magnetic drill is suction-fixed on the side of the magnetic drill support seat facing the outer flange of the connecting end; the drilling jig assembly includes two semi-ring bodies and two connecting bolt and nut groups, as well as a fixed bushing, a replaceable reaming sleeve, a replaceable rough reaming sleeve, a replaceable fine reaming sleeve and a plurality of fixed drill sleeves, the two semi-ring bodies have the same structure, and are respectively connected from both ends of the semi-ring bodies. A clamping edge is extended outward, and the inner circle of the semi-ring body matches the outer circle of the two crankshaft reference shoulders outside one side of the inner flange. The clamping edges at both ends of the upper and lower semi-ring bodies are respectively clamped and fixed by connecting bolt and nut groups, so that the upper and lower semi-ring bodies are clamped and fixed on the two crankshaft reference shoulders close to the outer flange; drill sleeve fixing rings are radially extended from the outer edges of the two semi-ring bodies abutting against one side of the inner flange, and the fixed bushings are fixed on the drill sleeve fixing rings and correspond to the positions of the positioning pin holes of the inner flange; multiple fixed drill sleeves are respectively fixed on the drill sleeve fixing rings of the two semi-ring bodies at intervals, and correspond one by one to the positions of multiple threaded holes of the inner flange; The magnetic drill support seat comprises two support seat semi-ring bodies and two connecting bolt and nut groups. The inner holes of the two support seat semi-ring bodies are axially provided with positioning steps. The inner circle synthesized by the two support seat semi-ring bodies is axially positioned on the other side of the outer circle of the inner flange through the positioning steps. Ear plates are respectively extended outward at both ends of the upper and lower support seat semi-ring bodies. The ear plates are respectively fixedly connected to the upper and lower support seat semi-ring bodies through the connecting bolt and nut groups, so that the two support seat semi-ring bodies are clamped and fixed on the other side of the outer circle of the inner flange. An axial reference line is engraved on the outer peripheral surface of the drill sleeve fixing ring of the upper semi-ring body, and the axial reference line corresponds to the top dead center reference line on the inner flange on the seventh main shaft diameter side of the diesel engine crankshaft; The inner circle of the semi-ring body and the outer circle of the two crankshaft shoulders on one side of the inner flange are interference fit; The position of the fixed bushing axis relative to the outer circle of the crankshaft reference shoulder is 2. A method for using the diesel engine crankshaft inner flange drilling tool as claimed in claim 1, characterized in that: The following steps are involved: 1) The diesel engine crankshaft is supported on the positioning assembly First, fix the base to both ends of the workbench respectively, and then support the V-shaped blocks on the base respectively, and support the first main shaft diameter and the seventh main shaft diameter of the diesel engine crankshaft on the corresponding V-shaped blocks respectively; 2) Adjust the position of the diesel engine crankshaft Turn the diesel engine crankshaft so that the top dead center reference line marked on the inner flange on the seventh main shaft diameter side of the diesel engine crankshaft is at the highest point; 3) Install the drilling jig assembly First, install a fixed bushing and multiple fixed drill sleeves on the drill sleeve fixing rings of the upper and lower semi-ring bodies, then align the two semi-ring bodies up and down, and fix the clamping edges at both ends of the aligned semi-ring bodies by connecting bolt and nut groups, so that the two semi-ring bodies are positioned on the two crankshaft reference shoulders close to the connecting end flange, and the end faces of the upper and lower semi-ring bodies are against one side of the inner flange; rotate the drilling jig assembly so that the axial reference line of the drill sleeve fixing ring of the upper semi-ring body is aligned with the top dead center reference line of the inner flange on the seventh main shaft diameter side; then tighten the connecting bolt and nut groups on the clamping edges at both ends of the upper and lower semi-ring bodies respectively, so that the upper and lower semi-ring bodies are clamped and fixed on the two crankshaft reference shoulders; finally, embed the replaceable reaming sleeve into the fixed bushing; 4) Install the magnetic drill support and magnetic drill First, the inner circle formed by the two support seat semi-ring bodies is axially positioned on the outer circle of the inner flange through the positioning step, and then the ear plates at both ends of the upper and lower support seat semi-ring bodies are fixedly connected by connecting bolt and nut groups respectively, so that the two support seat semi-ring bodies are clamped and fixed on the outer circle of the inner flange; then the magnetic suction seat of the magnetic drill is suction-fixed on one side of the magnetic drill support seat; 5) Drill multiple threaded bottom holes on the inner flange Install the threaded hole bottom hole drill bit in the chuck of the magnetic drill, start the magnetic drill, and insert the threaded hole bottom hole drill bit into each fixed drill sleeve in turn to drill out the threaded hole bottom holes of the inner flange one by one; 6) Complete the drilling of the positioning pin hole Replace the locating pin bottom hole drill bit, and extend the locating pin bottom hole drill bit into the replaceable reaming sleeve to complete the drilling of the locating pin bottom hole of the inner flange; then replace the reaming drill bit to complete the reaming of the locating pin bottom hole; 7) Complete the rough and fine reaming of the positioning pin hole Remove the magnetic drill, take out the replaceable reaming sleeve, embed the replaceable rough reaming sleeve into the fixed bushing, use the replaceable rough reaming sleeve to position, and manually rough reaming the locating pin hole; then take out the replaceable rough reaming sleeve, embed the replaceable fine reaming sleeve into the fixed bushing, use the replaceable fine reaming sleeve to position, and manually fine reaming the locating pin hole to complete the processing of the locating pin hole; 8) Manually tap each threaded hole Manually tap each hole one by one to complete the tapping of each threaded hole.

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