Machining method of annular part

Abstract

The invention discloses a machining method of an annular part. The machining precision is higher. Comprising the following steps: scribing; roughly turning one end face and an inner hole of the part; roughly turning the other end face of the part; a center line is drawn with the non-machining face of the part as the reference and used for drilling and milling alignment; an axial through hole and a kidney-shaped groove in the part are machined in place, radial holes evenly distributed in the circumferential direction are roughly machined, the axial through hole and the radial holes evenly distributed in the circumferential direction are machined and formed in the same clamping process, and the relative position relation of the axial through hole and the radial holes evenly distributed in the circumferential direction is guaranteed; milling a lug shape at the edge part of the part; finely turning one end surface and a circular inner hole of the part; finely turning the other end face of the part, and machining the taper of an inner hole; an axial blind hole in the part is machined; all radial holes in the part are subjected to finish machining; and milling notches, wherein the notches are communicated with the radial holes which are uniformly distributed in the circumferential direction.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a processing method for an annular part. Background Art

[0002] The support ring is a key part of the variable cross-section turbocharger. It is installed between the gas intake shell and the gas exhaust shell of the turbocharger and is used to install the adjustable nozzle ring blades. Therefore, the size of the nozzle ring and the radial hole indexing are required to be high. Otherwise, the gas intake flow rate will be affected and the performance of the turbocharger product will be reduced. In severe cases, the installed nozzle ring blades and the nozzle cover may interfere with each other and damage the turbocharger equipment. Due to the complex structure of this part and the high dimensional accuracy requirements, the following processing problems exist:

[0003] 1. The radial hole is long, the depth of the radial hole at the two bosses is 186mm, the boss length is 76mm, and the required processing tool length is at least 300mm. The step circle size accuracy requirement is high. Inner hole diameter The spindle head of the existing equipment cannot be inserted into the inner hole for processing. The coaxiality requirement with the hole is high, which cannot be guaranteed by boring and milling from the outside.

[0004] 2. The part is a cast blank, and a lot of excess needs to be removed during machining. In order to reduce the deformation after fine machining, rough machining is performed in the center of the radial hole. It is difficult to find the correct hole during subsequent finishing. The center and angle of the hole. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for processing an annular part with higher processing accuracy.

[0006] The object of the present invention is achieved in that:

[0007] A method for processing an annular part comprises the following steps:

[0008] 10 dash

[0009] End surface processing line;

[0010] 20 Rough Turning

[0011] Rough turning one end face and inner hole of the part;

[0012] 30 Rough Turning

[0013] Rough turning the other end face of the part;

[0014] 40 dash line

[0015] The center line is drawn based on the non-machined surface of the part for alignment during drilling and milling.

[0016] 50 digital milling

[0017] The axial through hole and waist-shaped groove on the part are processed in place, and the radial holes uniformly distributed in the circumferential direction are roughly processed. The axial through hole and the radial holes uniformly distributed in the circumferential direction are processed and formed in the same clamping to ensure the relative position relationship between the axial through hole and the radial holes uniformly distributed in the circumferential direction;

[0018] 60 CNC milling

[0019] Mill the lap shape on the edge of the part;

[0020] 70 fine turning

[0021] Finish turning one end face and circular inner hole of parts;

[0022] 80 fine turning

[0023] Finish turning the other end face of the part and machining the inner hole taper;

[0024] 90 CNC Milling

[0025] Axial blind holes on machined parts;

[0026] 100 CNC milling

[0027] Finishing all radial holes on parts;

[0028] 110 CNC milling

[0029] The notches are milled and connected with the radial holes evenly distributed around the circumference.

[0030] Preferably, in step 10, a circular line is also drawn for adjustment.

[0031] Preferably, in step 20, the large end face of the part is rough turned, in step 30, the small end face of the part is rough turned; in step 70, the small end face of the part is finish turned; in step 80, the large end face of the part is finish turned.

[0032] Preferably, in steps 70 and 80, take out the lathe tooling, place the part flat on the lathe tooling, select two symmetrical axial holes of the part as positioning holes, insert positioning pins into the part positioning holes and the lathe tooling to position the part, and a pressure plate is connected to the base by bolts to tighten the ledge.

[0033] Preferably, the part is a support ring. In step 100, a milling tool is used for clamping. When processing the remaining radial holes, the circumferentially uniformly distributed radial holes that have been processed on the part are aligned by aligning the milling tool. An angle head is used to rough and fine mill the step holes from the inner hole side to the qualified size. After removing the dividing head, the step holes are rough and fine milled from the outer circle side to the qualified size.

[0034] Preferably, the outer peripheral surface of the milling tool is in the shape of a stepped shaft, and the milling tool has an inner hole.

[0035] In step 50, when rough machining the radial holes uniformly distributed in the circumferential direction, two locating pin holes are machined in the axial direction, and the center line of the two locating pin holes passes through the center of the tooling;

[0036] In step 100, the locating pin hole on the milling tool cooperates with the locating pin hole on the support ring, and a pin is used for positioning. A straight edge is provided on the tool parallel to the center line of the locating pin hole. The straight edge is used to align the angle of the radial hole. The center of the processed radial hole can be aligned by aligning the inner hole of the milling tool and the straight edge.

[0037] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0038] 1. For the processing of long radial holes, it can be divided into two parts and processed from the inner and outer sides respectively. The inner hole side can use an angle head to change the processing direction from vertical to horizontal processing. The outer circle side can be processed horizontally by a five-axis device in the same clamping.

[0039] 2. For the fine machining and alignment of radial evenly distributed holes, two locating pin holes can be processed along the axial direction during the rough machining of radial holes. The alignment of the center of the rough machining radial holes can be achieved with the alignment tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the support ring installation;

[0041] Figure 2 This is the processing diagram of the support ring;

[0042] Figure 3 Schematic diagram of radial holes (uniformly distributed circumferentially);

[0043] Figure 4 Schematic diagram of radial long holes (not uniformly distributed around the circumference);

[0044] Figure 5 The figure is a schematic diagram of the milling tooling (the upper part of the figure is a straight edge for alignment);

[0045] Figure 6 is a schematic diagram of step 20;

[0046] Figure 7 is a schematic diagram of step 30;

[0047] Figure 8 is a schematic diagram of step 50;

[0048] Fig. 9 is a schematic diagram of step 70;

[0049] Fig.10 is a schematic diagram of step 80;

[0050] Fig.11 It is a schematic diagram of parts;

[0051] Fig.12 Schematic diagram of the notch position (the notch at R0.5 is an axial waist-shaped notch). DETAILED DESCRIPTION

[0052] According to the requirements of the size, shape and position tolerance of the support ring structure, the solution to the above processing problems is formulated as follows:

[0053] 1. Due to radial and The hole has a higher dimensional tolerance and coaxiality requirements, so the radial hole is The hole is divided into two parts for processing. The hole is processed from the inner hole side. The hole is machined from the outer circle. The two parts are machined in one process and one clamping using a five-axis machine. The inner radial hole is machined using an angle head, which is converted from vertical machining to horizontal machining. Hole processing in place; outside The holes are machined horizontally using five-axis equipment.

[0054] 2. When rough machining radial holes, 24 axial The through hole is processed in one clamping to ensure the relative position relationship between the axial hole and the radial hole. Two symmetrical axial holes are selected as positioning holes, and the alignment tool is added. The alignment tool can find the rough machining radial during fine machining. The center of the through hole. 4. Beneficial effects

[0055] A reliable and stable manufacturing method has been found for the processing of support rings and similar long radial hole annular parts:

[0056] 1. For the processing of long radial holes, it can be divided into two parts and processed from the inner and outer sides respectively. The inner hole side can use an angle head to change the processing direction from vertical to horizontal processing. The outer circle side can be processed horizontally by a five-axis device in the same clamping.

[0057] 2. For the fine machining and alignment of radially evenly distributed holes, two positioning pin holes can be machined along the axial direction during the rough machining of radial holes, and the alignment of the center of the rough machining radial holes can be achieved with the alignment tool.

[0058] The specific processing plan for parts is as follows:

[0059] 10 Marking (marking end surface processing line and circular line for adjustment)

[0060] →20 Rough turning (rough turning of end face and inner hole)

[0061] →30 Rough turning (rough turning the other end face)

[0062] →40 marking (marking the center line based on the non-machined surface, used for drilling and milling alignment)

[0063] →50 CNC milling (machining axial through holes, waist-shaped grooves and 2 positioning holes, rough machining of radial holes)

[0064] →60 digital milling (milling the shape of the bracket)

[0065] →70 fine turning (finishing end face and inner hole)

[0066] →80 fine turning (fine turning the other end face)

[0067] →90 CNC milling (processing other axial holes)

[0068] →100 CNC milling (machining all radial holes)

[0069] →110 digital milling (milling 2 notches to connect with corresponding radial holes)

[0070] →120 clamp

[0071] 1. During the 50-degree milling process, the axial positioning hole and the radial hole are processed in the same clamping, which ensures the relative position relationship between the axial positioning hole and the radial hole. In combination with the milling tool CTA120-XG186, the center of the processed radial hole can be aligned during the 100-degree milling process.

[0072] 2.100 CNC milling process When machining radial holes, use the alignment tool to align the already machined radial holes on the parts, and use the angle head to perform rough and fine milling from the inner hole side. and Hole, Drill, Ream Hole to drawing size. Remove the dividing head and perform rough and fine milling from the outer circle side. Hole to drawing size.

[0073] 3.100 milling alignment tool CTA120-XG186 has Positioning pin hole, the center line of the pin hole passes through the center of the tooling and the support ring The locating pin hole is matched and positioned by two pins on one side to ensure that the center of the processed radial hole passes through the center of the tooling after clamping. There is a straight edge on the tooling that is parallel to the center line of the locating pin hole to align the angle of the radial hole. The center of the processed radial hole can be aligned by aligning the inner hole of the tooling and the straight edge.

[0074] The process table is as follows:

[0075]

[0076]

[0077]

[0078]

[0079] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for processing an annular part, characterized in that: The steps include: 10 dash End surface processing line; 20 Rough Turning Rough turning one end face and inner hole of the part; 30 Rough Turning Rough turning the other end face of the part; 40 dash line The center line is drawn based on the non-machined surface of the part for alignment during drilling and milling. 50 digital milling The axial through hole and waist-shaped groove on the part are processed in place, and the radial holes uniformly distributed in the circumferential direction are roughly processed. The axial through hole and the radial holes uniformly distributed in the circumferential direction are processed and formed in the same clamping to ensure the relative position relationship between the axial through hole and the radial holes uniformly distributed in the circumferential direction; 60 CNC milling Mill the lap shape on the edge of the part; 70 fine turning Finish turning one end face and circular inner hole of parts; 80 fine turning Finish turning the other end face of the part and machining the inner hole taper; 90 CNC Milling Axial blind holes on machined parts; 100 CNC milling Finishing all radial holes on parts; 110 CNC milling The notches are milled and connected with the radial holes evenly distributed around the circumference.

2. A method for processing an annular part according to claim 1, characterized in that: In step 10, a circular line is also used for adjustment.

3. A method for processing an annular part according to claim 1, characterized in that: In step 20, the large end face of the part is rough turned, and in step 30, the small end face of the part is rough turned; in step 70, the small end face of the part is fine turned; in step 80, the large end face of the part is fine turned.

4. A method for processing an annular part according to claim 1, characterized in that: In steps 70 and 80, take out the lathe tooling, place the part flat on the lathe tooling, select two symmetrical axial holes of the part as positioning holes, insert the positioning pins into the part positioning holes and the lathe tooling to position the part, and a pressure plate is connected to the base by bolts to tighten the ledge.

5. The method for processing an annular part according to claim 1, characterized in that: The part is a support ring. In step 100, a milling tool is used for clamping. When processing the remaining radial holes, the circumferentially uniformly distributed radial holes that have been processed on the part are aligned by aligning the milling tool. An angle head is used to rough and fine mill the step holes from the inner hole side to the qualified size. After removing the dividing head, the step holes are rough and fine milled from the outer circle side to the qualified size.

6. A method for processing an annular part according to claim 5, characterized in that: The outer peripheral surface of the milling tool is in the shape of a stepped shaft, and the milling tool has an inner hole. In step 50, when rough machining the radial holes uniformly distributed in the circumferential direction, two locating pin holes are machined in the axial direction, and the center line of the two locating pin holes passes through the center of the tooling; In step 100, the locating pin hole on the milling tool cooperates with the locating pin hole on the support ring, and a pin is used for positioning. A straight edge is provided on the tool parallel to the center line of the locating pin hole. The straight edge is used to align the angle of the radial hole. The center of the processed radial hole can be aligned by aligning the inner hole of the milling tool and the straight edge.

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