A rotating seat for machining a bearing outer ring and a machining method of oil inlet and outlet holes

Abstract

The application discloses a rotating seat for bearing outer ring machining and a machining method of oil inlet and outlet holes, and belongs to the technical field of bearing machining. The application is aimed at solving the problems of the existing machining method of oil inlet and outlet holes of a rolling bearing outer ring, such as the need of seven clamping and correcting processes, the need of complex and many matched toolings, the difficulty of manual adjustment, the high rejection rate and the low machining efficiency. The application comprises a bearing outer ring supporting column, a fastening pressure disc, adjusting bolts and positioning pins. The bearing outer ring and the fastening pressure disc are sequentially sleeved on the bearing outer ring supporting column, and the fastening pressure disc and the bearing outer ring are axially positioned through the adjusting bolts. The positioning pins are inserted between the bearing outer ring and the bearing outer ring supporting column and are used for the radial positioning of the bearing outer ring. The application is mainly used for machining the bearing outer ring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bearing processing, and particularly relates to a rotating seat for bearing outer ring processing and a processing method of oil inlet and return holes of a bearing outer ring. BACKGROUND

[0002] Due to the complicated structure of a turbocharger intermediate body, a rolling bearing opposite to the turbocharger intermediate body structure needs to have oil inlet and return holes to meet the bearing oil inlet and return functions, as shown in the figure. Figure 1 It is found through investigation that the oil hole processing procedure of the bearing outer ring in the prior art is generally as follows: ① a bearing outer ring lower end face is fixed by using a clamping seat with a fixed angle, and a pressing plate is used to press tightly, and a blind hole at the upper end of the oil inlet hole is milled by using a milling machine. ② a clamping seat positioning pin is installed to ensure that the two sides of the blind hole are on the same axis, and the bearing outer ring is adjusted to process the blind hole at the upper end of the other side of the oil inlet hole. ③ a drill bed is replaced, the bearing outer ring lower end face is fixed by using a clamping seat with a fixed angle and a guide hole, a drill bit passes through the guide hole of the clamping seat to align the position to process one side of the oil inlet hole. ④ a clamping seat positioning pin is installed to ensure that the two sides of the oil hole are on the same axis, and the bearing outer ring is adjusted to process the other side of the oil inlet hole. ⑤ a straight hole is drilled in the outer ring by using a drill bed to perform rough processing of the oil return hole. ⑥ a milling machine is replaced, the bearing outer ring lower end face is fixed by using a clamping seat with a fixed angle and a positioning pin, a milling cutter is aligned to the position to process the left side of the oil return hole. ⑦ the position of the positioning pin is adjusted, the bearing outer ring is installed to form a specific angle through the positioning pin, and a milling cutter is aligned to the position to process the right side of the oil return hole. This method needs to be clamped and corrected for 7 times and needs to be matched with many complex toolings, manual adjustment is difficult, the scrap rate is high, the processing efficiency is low, and the like, and needs to be optimized and improved. SUMMARY

[0003] The technical problem to be solved by the present application is that the existing processing method of the oil inlet and return holes of the rolling bearing outer ring needs to be clamped and corrected for 7 times, needs to be matched with many complex toolings, manual adjustment is difficult, the scrap rate is high, and the processing efficiency is low, and the like, and a rotating seat for bearing outer ring processing and a processing method of oil inlet and return holes of a bearing outer ring are further provided.

[0004] The technical scheme adopted by the present application to solve the above technical problem is as follows:

[0005] A rotating seat for bearing outer ring processing, which comprises a bearing outer ring support column, a fastening pressing disc, an adjusting bolt and a positioning pin; the bearing outer ring and the fastening pressing disc are sequentially sleeved on the bearing outer ring support column, and the fastening pressing disc and the bearing outer ring are axially positioned by the adjusting bolt, and the positioning pin is inserted between the bearing outer ring and the bearing outer ring support column and is used for radial positioning of the bearing outer ring.

[0006] Further, the bearing outer ring support column comprises, from top to bottom, an adjusting screw rod, a stand, a limiting ring and a clamping column; the adjusting bolt is screwed on the adjusting screw rod; the stand is in clearance fit with the bearing outer ring; the limiting ring has an outer diameter greater than that of the bearing outer ring.

[0007] Further, vertical faces are formed on the opposite sides of the stand, and the positioning pin is located between the vertical faces of the stand and the bearing outer ring.

[0008] Further, a through hole is formed in the radial direction of the stand, and the through hole penetrates the vertical faces on the two sides.

[0009] A method for machining the oil inlet and outlet holes of a bearing outer ring, and the specific machining steps are as follows:

[0010] Step 1: clamping of the rotating seat: place the rotating seat on the rotary table of the numerical control five-axis machine tool, and clamp the clamping column of the rotating seat by the clamping jaws on the rotary table of the numerical control five-axis machine tool to fix the rotating seat, and set the axis of the rotary table as the C-axis;

[0011] Step 2: fixing of the bearing outer ring: sequentially place the bearing outer ring to be machined and the fastening pressure disc on the bearing outer ring support column of the rotating seat, wherein the reference surface A of the bearing outer ring abuts against the limiting ring, and then axially press by the adjusting bolt to fix the bearing outer ring to be machined;

[0012] Step 3: machining of the oil outlet hole: install the drill bit on the tool holder of the numerical control five-axis machine tool, set the axis of the tool holder as the B-axis, adjust the B-axis of the tool holder to the horizontal state, rotate the C-axis of the rotary table by 180 degrees, drill a straight oil hole on the bearing outer ring by the drill bit, then replace the drill bit with a D10 milling cutter, deflect the B-axis of the tool holder downward by an angle of 10°, rotate the C-axis of the rotary table by an angle of 10°, mill one side of the straight oil hole and then retract the tool; rotate the C-axis of the rotary table by an angle of -20°, and mill the other side of the straight oil hole by the D10 milling cutter of the tool holder to complete the machining of the elliptical oil outlet hole;

[0013] Step 4: machining of one of the inclined oil inlet holes: rotate the C-axis of the rotary table to the initial position, replace the D10 milling cutter with a D2 milling cutter, deflect the B-axis of the tool holder upward by an angle of 30°, and perform helical plunge milling on the inclined surface of the groove of the bearing outer ring to machine a blind hole with an inner diameter of 2.6 mm; return the B-axis of the tool holder to the original position, replace the D2 milling cutter with a drill bit, and again deflect the B-axis of the tool holder upward by an angle of 30° to drill a hole in the center of the blind hole in a pecking manner to machine a through hole with an inner diameter of 0.9 mm, and the machining of one of the inclined oil inlet holes is completed;

[0014] Step 5, processing another inclined oil hole: the bearing outer ring is detached from the rotating seat, the bearing outer ring is turned upside down, the reference B surface of the bearing outer ring is abutted on the limiting ring, the positioning pin is inserted between the bearing outer ring and the vertical surface of the column, the radial positioning of the bearing outer ring is realized, the bearing outer ring is axially positioned again by using the adjusting bolt; the drill bit of the tool holder is replaced by a D2 milling cutter, the B shaft of the tool holder is upwardly deflected by an angle of 30 degrees, spiral slot milling is carried out on the groove inclined surface of the bearing outer ring, and a blind hole with an inner diameter of 2.6 mm is processed first; the B shaft of the tool holder is returned to the original position, the D2 milling cutter is replaced by a drill bit, the B shaft of the tool holder is again upwardly deflected by an angle of 30 degrees, and a through hole with an inner diameter of 0.9 mm is drilled in the center of the blind hole in a pecking manner, and the processing of another inclined oil hole is completed.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The present application utilizes the numerical control five-axis machine tool and the special rotating seat to realize the processing of the oil return hole and the inclined oil hole of the bearing outer ring through twice clamping, ensures the machining precision of the bearing outer ring, and further ensures the matching of the bearing and the turbocharger intermediate body, the bearing oil inlet and return functions, and the machining precision and efficiency are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application.

[0018] Figure 1 It is a schematic diagram of the overall structure of the bearing outer ring.

[0019] Figure 2 It is a schematic diagram of the numerical control five-axis machine tool.

[0020] Figure 3 It is a schematic diagram of the structure of the rotating seat Figure 1 .

[0021] Figure 4 It is a schematic diagram of the structure of the rotating seat Figure 2 .

[0022] Figure 5 It is a top view of the bearing outer ring support column.

[0023] Figure 6 It is a schematic diagram of the structure of the fastening pressure plate.

[0024] Marked: 1-bearings outer ring support column; 1-1-adjusting screw; 1-2-column; 1-2-1-vertical surface; 1-2-2-through hole; 1-3-limiting ring; 1-4-clamping column; 2-fastening pressure plate; 2-1-slot; 3-adjusting bolt; 4-bearing outer ring; 4-1-oil return hole; 4-2-inclined oil hole; 4-2-1-groove inclined surface; 4-2-2-through hole; 5-rotary table; 6-tool holder. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to explain the present application but not to limit the scope of the present application.

[0026] Referring to Figures 3 to 6 The rotating seat for bearing outer ring machining provided in the embodiments of the present application comprises a bearing outer ring supporting column 1, a fastening pressure plate 2, an adjusting bolt 3 and a positioning pin. A bearing outer ring 4 and the fastening pressure plate 2 are sequentially sleeved on the bearing outer ring supporting column 1, and the fastening pressure plate 2 and the bearing outer ring 4 are axially positioned by the adjusting bolt 3. The positioning pin is inserted between the bearing outer ring 4 and the bearing outer ring supporting column 1 and is used for radial positioning of the bearing outer ring 4.

[0027] Referring to Figure 2 The bearing outer ring supporting column 1 comprises an adjusting screw rod 1-1, a column 1-2, a limiting ring 1-3 and a clamping column 1-4 which are sequentially arranged from top to bottom. The adjusting bolt 3 is screwed on the adjusting screw rod 1-1. The column 1-2 is in clearance fit with the bearing outer ring 4. The outer diameter of the limiting ring 1-3 is greater than the outer diameter of the bearing outer ring 4.

[0028] Further, vertical faces 1-2-1 are formed on opposite positions of the column 1-2. A through hole 1-2-2 is formed on the column 1-2 in a radial direction. The through hole 1-2-2 penetrates the vertical faces 1-2-1 on the two sides. The positioning pin is between the vertical face 1-2-1 of the column 1-2 and the bearing outer ring 4.

[0029] Referring to Figure 6 The fastening pressure plate 2 is circular. A gap 2-1 is formed on the fastening pressure plate 2 in a radial direction. The inner diameter of the gap 2-1 in the width direction is equal to the outer diameter of the adjusting screw rod 1-1, and the two are in clearance fit.

[0030] The rotating seat in the present application is installed on a numerical control five-axis machining rotary table 5 through the clamping column 1-4. The clamping jaw on the numerical control five-axis machining rotary table 5 clamps the clamping column 1-4 to fix the rotating seat.

[0031] The rotating seat in the present application is used for fixing the bearing outer ring 4 to facilitate rotation and surface change of the bearing outer ring 4 during machining.

[0032] The bearing outer ring 4 in the present application comprises an oval-shaped oil return hole 4-1 and two inclined oil inlet holes 4-2. Each inclined oil inlet hole 4-2 is composed of a blind hole and a through hole 4-2-2.

[0033] The embodiment of the application adopts a numerical control five-axis machine tool to machine oil inlet and return holes of a bearing outer ring, and provides a machining method for the oil inlet and return holes of the bearing outer ring.

[0034] Step 1, clamping of the rotating seat: placing the rotating seat on the rotary table 5 of the numerical control five-axis machine tool, clamping the clamping columns 1-4 of the rotating seat through the clamping jaws on the rotary table 5 of the numerical control five-axis machine tool to fix the rotating seat, and setting the axis of the rotary table 5 as the C-axis;

[0035] Step 2, fixing of the bearing outer ring: sequentially sleeving the bearing outer ring 4 to be machined and the fastening pressure disc 2 on the bearing outer ring supporting column 1 of the rotating seat, wherein the reference surface A of the bearing outer ring 4 abuts against the limiting ring 1-3, and then axially pressing through the adjusting bolt 3 to fix the bearing outer ring 4 to be machined;

[0036] Step 3, machining of the oil return hole: installing a drill on the tool holder 6 of the numerical control five-axis machine tool, setting the axis of the tool holder 6 as the B-axis, adjusting the B-axis of the tool holder 6 to a horizontal state, rotating the C-axis of the rotary table 5 by 180 degrees, drilling a straight oil hole on the bearing outer ring 4 by using the drill, then replacing the drill with a D10 milling cutter, deflecting the B-axis of the tool holder 6 downward by an angle of 10°, rotating the C-axis of the rotary table 5 by an angle of 10°, milling one side of the straight oil hole and then retracting the tool, rotating the C-axis of the rotary table 5 by an angle of -20°, and milling the other side of the straight oil hole by using the D10 milling cutter of the tool holder 6 to complete the machining of the elliptical oil return hole 4-1;

[0037] Step 4, machining of one of the inclined oil inlet holes: rotating the C-axis of the rotary table 5 to the initial position, replacing the D10 milling cutter with a D2 milling cutter, deflecting the B-axis of the tool holder 6 upward by an angle of 30°, and performing helical plunge milling on the groove inclined surface 4-2-1 of the bearing outer ring 4 to machine a blind hole with an inner diameter of 2.6 mm; returning the B-axis of the tool holder 6 to the original position, replacing the D2 milling cutter with a drill, again deflecting the B-axis of the tool holder 6 upward by an angle of 30°, drilling a hole in the center of the blind hole in a pecking manner to machine a through hole 4-2-2 with an inner diameter of 0.9 mm, and completing the machining of one of the inclined oil inlet holes 4-2;

[0038] Step 5, processing another inclined oil hole: the bearing outer ring 4 is detached from the rotating seat, the bearing outer ring 4 is turned upside down, the reference B surface of the bearing outer ring 4 abuts against the limiting ring 1-3, the positioning pin is inserted between the bearing outer ring 4 and the vertical surface 1-2-1 of the column, the radial positioning of the bearing outer ring 4 is realized, the bearing outer ring 4 is axially positioned again by using the adjusting bolt 3; the drill bit of the tool holder 6 is replaced by a D2 milling cutter, the B axis of the tool holder 6 is upwardly deflected by an angle of 30°, the spiral plunge milling is performed on the groove inclined surface 4-2-1 of the bearing outer ring 4, the blind hole with an inner diameter of 2.6 mm is first processed; the B axis of the tool holder 6 is returned to the original position, the D2 milling cutter is replaced by a drill bit, the B axis of the tool holder 6 is again upwardly deflected by an angle of 30°, the hole is drilled in the pecking manner at the center of the blind hole, the through hole 4-2-2 with an inner diameter of 0.9 mm is processed, and the processing of the other inclined oil hole 4-2 is completed.

[0039] While the application has been described with reference to specific embodiments, it is to be understood that these examples are merely illustrative of the principles and applications of the present application. It will be apparent to those skilled in the art that numerous modifications, both as to the details of construction and the embodiments itself, can be made without departing from the spirit and scope of the application as defined in the appended claims. It is to be understood that all combinations of the features described herein can be achieved by combining means of the dependent clauses with features described herein. It is to be understood that features described with respect to one embodiment can be used in other embodiments.

Claims

1. A method for machining the oil inlet and return holes of a bearing outer ring, characterized in that: The method is realized by using a rotating seat for processing the outer ring of a bearing, wherein the rotating seat comprises a bearing outer ring support column (1), a fastening pressure plate (2), an adjusting bolt (3) and a positioning pin; the bearing outer ring (4) and the fastening pressure plate (2) are sequentially sleeved on the bearing outer ring support column (1), and the fastening pressure plate (2) and the bearing outer ring (4) are axially positioned by the adjusting bolt (3); the positioning pin is inserted between the bearing outer ring (4) and the bearing outer ring support column (1) and is used for radial positioning of the bearing outer ring (4); The bearing outer ring support column (1) comprises an adjusting screw (1-1), a column (1-2), a limiting ring (1-3) and a clamping column (1-4) arranged in sequence from top to bottom; the adjusting bolt (3) is screwed onto the adjusting screw (1-1), and a clearance fit is formed between the column (1-2) and the bearing outer ring (4); the outer diameter of the limiting ring (1-3) is larger than the outer diameter of the bearing outer ring (4); Vertical surfaces (1-2-1) are formed at opposite positions on both sides of the column (1-2), and the positioning pin is located between the vertical surface (1-2-1) of the column (1-2) and the outer ring (4) of the bearing; A through hole (1-2-2) is radially opened on the column (1-2), and the through hole (1-2-2) penetrates the vertical surfaces (1-2-1) on both sides; The specific processing steps are as follows: Step 1, clamping the rotating seat: place the rotating seat on the turntable (5) of the CNC five-axis machine tool, and clamp the clamping columns (1-4) of the rotating seat by the clamping claws on the turntable (5) of the CNC five-axis machine tool to fix the rotating seat, and set the axis of the turntable (5) as the C axis; Step 2, fixing the bearing outer ring: the bearing outer ring to be processed (4) and the fastening pressure plate (2) are sequentially placed on the bearing outer ring support column (1) of the rotating seat, wherein the reference surface A of the bearing outer ring (4) abuts against the limit ring (1-3), and then axially tightened by adjusting the bolt (3) to fix the bearing outer ring to be processed (4); Step 3, processing the oil return hole: install the drill bit on the tool holder (6) of the CNC five-axis machine tool, and set the axis of the tool holder (6) as the B axis, adjust the B axis of the tool holder (6) to a horizontal state, rotate the C axis of the rotary table (5) 180 degrees, and use the drill bit to drill a straight oil hole on the bearing outer ring (4), then replace the drill bit with a D10 milling cutter, deflect the B axis of the tool holder (6) downward by 10 degrees, rotate the C axis of the rotary table (5) by 10 degrees, mill one side of the straight oil hole and then retract the tool; rotate the C axis of the rotary table (5) by -20 degrees, use the D10 milling cutter of the tool holder (6) to mill the other side of the straight oil hole, and complete the processing of the elliptical oil return hole (4-1); Step 4, processing one of the oblique oil inlet holes: the C axis of the rotary table (5) is rotated to the initial position, the D10 milling cutter is replaced with the D2 milling cutter, the B axis of the tool holder (6) is deflected upward by 30 degrees, and spiral milling is performed on the groove bevel (4-2-1) of the bearing outer ring (4), first processing a blind hole with an inner diameter of 2.6 mm; the B axis of the tool holder (6) is returned to its position, the D2 milling cutter is replaced with a drill bit, the B axis of the tool holder (6) is deflected upward by 30 degrees again, and a hole is drilled in the center of the blind hole by pecking, processing a through hole (4-2-2) with an inner diameter of 0.9 mm, completing the processing of one of the oblique oil inlet holes (4-2); Step 5, process another oblique oil inlet hole: remove the bearing outer ring (4) from the rotating seat, turn the bearing outer ring (4) up and down, so that the reference B surface of the bearing outer ring (4) abuts against the limit ring (1-3), insert the positioning pin between the bearing outer ring (4) and the vertical surface (1-2-1) of the column to achieve radial positioning of the bearing outer ring (4), and use the adjusting bolt (3) to axially position the bearing outer ring (4) again; replace the drill bit of the tool holder (6) with a D2 milling cutter , the B axis of the tool holder (6) is deflected upward by 30°, and spiral milling is performed on the groove bevel (4-2-1) of the bearing outer ring (4), first processing a blind hole with an inner diameter of 2.6mm; the B axis of the tool holder (6) is returned to its original position, and the D2 milling cutter is replaced with a drill bit. The B axis of the tool holder (6) is deflected upward by 30° again, and a hole is drilled in the center of the blind hole by pecking, processing a through hole (4-2-2) with an inner diameter of 0.9mm, completing the processing of another inclined oil inlet hole (4-2).

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