CN113732421B - Tool for machining stepped oil hole in raceway over-travel groove and electric spark machining method - Google Patents
Tool for machining stepped oil hole in raceway over-travel groove and electric spark machining method Download PDFInfo
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- CN113732421B CN113732421B CN202111137620.6A CN202111137620A CN113732421B CN 113732421 B CN113732421 B CN 113732421B CN 202111137620 A CN202111137620 A CN 202111137620A CN 113732421 B CN113732421 B CN 113732421B
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- 238000003754 machining Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010892 electric spark Methods 0.000 title abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000003825 pressing Methods 0.000 claims description 18
- 238000003672 processing method Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 48
- 238000005457 optimization Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/14—Making holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to a tool and an electric spark machining method for machining a stepped oil hole in a raceway over-travel groove, and relates to a machining method and a tool for the stepped oil hole. The use of the equal-dividing tool solves the defect of shaking the turntable handle, avoids the angle error and repeated positioning error, and is simple and convenient to operate. The consistency and stability of the processing quality of the workpiece are improved, the processing beat is shortened, and the production efficiency is improved.
Description
Technical Field
The invention relates to a machining method and a tool for a stepped oil hole, in particular to a tool for machining a stepped oil hole in a raceway over-travel groove and an electric spark machining method, and relates to the technical field of bearing machining.
Background
In order to improve the lubrication effect of the cylindrical roller bearing, improve the working quality and prolong the service life, the bearing is designed into a ring-down lubrication structure, a plurality of radial oil holes are designed in the outer diameter of the inner ring and the raceway over-travel groove, and lubricating oil enters the bearing oil holes through injection, so that the bearing is lubricated and cooled. However, the design increases the processing difficulty of the oil hole, and the conventional drilling and milling processing method is adopted, so that the drill bit and the milling cutter are small in diameter and easy to break, and the processing is difficult to realize, and then the electric spark discharge processing is adopted to replace the drilling and milling processing.
The rotation axis A and the rotation axis C of the electric spark equipment are borne by a manual rotation workbench, the transmission ratio of a rotary table is 1:90, each time a hand wheel rotates 90, the workbench rotates one revolution, the manual rotation workbench has large dependence on the operation skill and constitution of an operator, the error probability is high due to the fact that revolution is not right or graduation marks are not aligned during rotation angle, and the defect of large repeated positioning error exists, so that a stepped hole cannot be realized by overlapping two cylindrical holes through secondary positioning by using a cylindrical electrode, the processing auxiliary time is long, the production efficiency is low, the qualification rate is low, and the consistency of the processing quality of workpieces in the same batch is poor.
Taking a bearing inner ring (hereinafter referred to as a workpiece for short) with stepped oil holes in a certain raceway over-travel groove as an example, the structure is shown in fig. 1, two oil drain holes are axially arranged, the circumference of each oil drain hole is equally divided, the circumferences of the two oil drain holes are staggered by 45 degrees, the axes of the oil holes and the axes of the bearing inner ring form 72-degree included angles respectively, the diameter dimension of the oil holes close to the outer diameter direction is phi 0.9mm, the depth is 1.2mm, the diameter dimension of the rest oil holes is phi 0.7mm, the distance between the intersection point of the axes of the oil holes and the diameter of the raceway is 3.72+/-0.05 mm, and the machining trace of the residual oil holes is not allowed on the surfaces of the raceway and the flange. The electric spark processing technology is not limited by the material, hardness and strength of the tool in the machining. However, the technical difficulties of the small-aperture stepped oil hole in the electric spark discharge machining raceway over-travel groove are as follows:
1) The diameter of the oil hole is small, and a certain discharge gap is required to be reserved between the electrode and the wall of the oil hole to be processed, so that the diameter of the electrode is required to be smaller. The thinner electrode is easy to deform, has large processing difficulty and has high requirements on preservation conditions.
2) The electrode is tiny, and electrode loss is serious in the processing process, and the aperture and the step position of the processing oil hole and the depth of the oil hole are influenced, so that the axial and radial sizes of the oil hole to be processed are possibly out of tolerance.
3) The gap between the electrode and the wall of the oil hole to be processed is small, so that the electric corrosion product is difficult to discharge in the hole, and the electric corrosion product is easy to bridge in the gap and cause short circuit along with the higher and higher concentration of the electric corrosion product when the processing is carried out, thereby influencing the processing quality;
4) The remelted layer exists on the surface of the product after electric spark machining, fatigue cracks are easy to generate in long-term work, so that the control of the depth of the remelted layer is extremely critical, and the depth beta of the remelted layer is generally required to be less than or equal to 0.010mm.
5) The axial position and the angle of the oil hole are out of tolerance or the depth of the oil hole is over the over-travel groove easily caused by the narrow over-travel groove of the rollaway nest, and the oil hole processing trace remains on the surfaces of the rollaway nest and the flange, so that the workpiece is scrapped.
The electric spark technology is adopted to increase the difficulty in machining the stepped oil holes in the rolling way overtravel groove, so that the machining efficiency is low and the qualification rate is low.
Disclosure of Invention
The invention aims to solve the problems of the existing electric spark technology that the machining difficulty of the stepped oil hole in the raceway over-travel groove is increased, the machining efficiency is low and the qualification rate is low, and further provides a tool for machining the stepped oil hole in the raceway over-travel groove and an electric spark machining method.
The technical scheme adopted by the invention for solving the problems is as follows:
the quick-release clamp comprises a positioning bolt, a quick-release clamp plate, a workpiece seat, a base and a locking screw, wherein the quick-release clamp plate, the workpiece seat and the base are sequentially sleeved on the positioning bolt from top to bottom, a workpiece is sleeved on the quick-release clamp plate and the workpiece seat, and the locking screw penetrates through the side wall of the base and is connected with the workpiece seat.
Further, the quick-release pressing plate is a disc body, a through hole for penetrating through the positioning bolt is formed in the upper surface of the quick-release pressing plate, and a first outer edge extending outwards horizontally is arranged on the upper surface of the quick-release pressing plate.
Further, the upper surface of the workpiece seat is provided with a screw hole matched with the positioning bolt, the lower surface of the workpiece seat is provided with a second outer edge which extends outwards horizontally, and the middle part of the lower surface of the second outer edge is provided with a polygonal protrusion.
Further, the upper surface of the base is provided with a polygonal through groove matched with the polygonal protrusion.
The processing method for processing the stepped oil hole in the raceway overtravel groove is characterized by comprising the following steps of: the processing method for processing the stepped oil hole in the raceway overrun groove comprises the following steps:
step one, adjusting a tool:
1) Clamping the base onto a chuck of the turntable;
2) The polygonal bulge of the workpiece seat is inserted into the polygonal through groove of the base, and the locking screw penetrates through the side wall of the base and then is connected with the polygonal bulge;
3) Sleeving the workpiece on the workpiece seat and the quick-release pressing plate;
4) Clamping a workpiece through a first outer edge of the quick-release pressing plate and a second outer edge of the workpiece seat;
5) The quick-release pressing plate, the workpiece and the workpiece seat are connected together through a positioning bolt and are concentrically arranged;
6) Connecting the locking screw with the workpiece seat by penetrating through the side wall of the base;
step two, calibrating the electrode:
1) Before machining, confirming parallelism of the electrode and the Z axis and coaxiality of the working surface of the electrode;
2) The electrode is arranged on the electrode clamp, two sections of cylindrical surfaces of the stepped electrode are measured by using a dial indicator, measuring points respectively prop against the cylindrical bus in the +X, -X, +Y and Y directions, and the electrode is moved in the Z direction;
3) The pointer swing of the dial indicator is smaller than 0.002mm and passes the calibration;
step three, aligning the workpiece:
the dial indicator contact is abutted against the end face or the outer diameter of the clamped workpiece, the workpiece is made to rotate for one circle, the axis clamping of the workpiece is confirmed to be horizontal or vertical, a machining coordinate system, a coordinate zero point and a safety plane are set by utilizing centering alignment and edge collision instructions, and the position and depth of a machining oil hole are determined;
step four: machining an oil hole of a workpiece;
step five: after one oil hole is machined, the locking screw is unscrewed, the workpiece seat rotates by a corresponding angle relative to the base, the base is reinserted, the locking screw is screwed, and the next oil hole is machined.
Further, the electrode in the second step comprises a first cylindrical section, a cone section, a second cylindrical section and a third cylindrical section, and the first cylindrical section, the cone section, the second cylindrical section and the third cylindrical section are sequentially connected from top to bottom.
Further, the diameter of the second cylindrical section is 0.74mm-0.76mm.
Further, the diameter of the third cylindrical section is 0.54mm-0.56mm.
The beneficial effects of the invention are as follows:
and detecting the processed workpiece according to the technical requirement of the finished product, wherein the detection results all meet the technical requirement of the finished product. The specific detection results are as follows:
1) Angle of oil hole
The circumferences 4 of the single-row oil holes are equally divided, the included angle of the axes of two adjacent oil holes is 90 degrees, and the circumferences of the two oil holes are correspondingly staggered by 45 degrees. By means of the pin and detection by adopting a projector, 9 data are detected in total, and the difference between the actual measurement value and the theoretical value of the angle is not more than 45', so that the technical requirement of a finished product is met.
2) Position of oil hole
Slicing the workpiece along the axial direction of the oil hole, and detecting the position of the oil groove by adopting an OGP projector. Theoretical value is 3.72 + -0.05, and measured value is 3.72 + -0.04. Meets the technical requirements of finished products.
3) Depth of remelted layer
And the method adopts the test pieces processed by the parameters before and after the optimization to detect the remelting layer depth, wherein the actual measurement value of the remelting layer depth before the parameter optimization is 0.016 mm-0.019 mm, and the actual measurement value of the remelting layer depth after the parameter optimization is 0.007 mm-0.009 mm. Meets the technical requirement of 0.010mm for finished products.
In addition, the tool is subjected to precision inspection and acceptance before being used, the defect of shaking the turntable handle is overcome by using the equal-dividing tool, the angle error and repeated positioning error are avoided, and the operation is simple and convenient. The consistency and stability of the processing quality of the workpiece are improved, the processing beat is shortened, and the production efficiency is improved.
Drawings
FIG. 1 is an assembly schematic diagram of a tooling;
FIG. 2 is a schematic view of the construction of a positioning bolt; FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic view of the construction of a quick release platen;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic view of a structure of a workpiece holder;
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a schematic structural view of a base;
FIG. 9 is a top view of FIG. 8;
FIG. 10 is a schematic view of the structure of an electrode;
FIG. 11 is a schematic view of the structure of a workpiece;
fig. 12 is a side view of fig. 11.
Detailed Description
Body embodiment one: referring to fig. 1, the tool for machining the stepped oil hole in the raceway overtravel groove according to the present embodiment includes a positioning bolt 1, a quick-release pressing plate 2, a workpiece seat 4, a base 5, and a locking screw 6, wherein the quick-release pressing plate 2, the workpiece seat 4, and the base 5 are sequentially sleeved on the positioning bolt 1 from top to bottom, the workpiece 3 is sleeved on the quick-release pressing plate 2 and the workpiece seat 4, and the locking screw 6 penetrates through the side wall of the base 5 to be connected with the workpiece seat 4.
The second embodiment is as follows: referring to fig. 4 and 5, in this embodiment, the quick release plate 2 is a disc, the upper surface of the quick release plate 2 is provided with a through hole 2-1 for passing through the positioning bolt 1, and the upper surface of the quick release plate 2 is provided with a first outer edge 2-2 extending horizontally outwards. Other components and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: referring to fig. 6 and 7, in this embodiment, a screw hole 4-1 matched with the positioning bolt 1 is formed on the upper surface of the workpiece seat 4, a second outer edge 4-2 extending horizontally outwards is formed on the lower surface of the workpiece seat 4, and a polygonal protrusion 4-3 is formed in the middle of the lower surface of the second outer edge 4-2. The lower surface of the first outer edge 2-2 is in contact with the upper surface of the workpiece 3; the upper surface of the second outer edge 4-2 is in contact with the lower surface of the workpiece 3, and the first outer edge 2-2 and the second outer edge 4-2 clamp the workpiece 3. Other components are the same as those in the first or second embodiment in connection.
The specific embodiment IV is as follows: in the present embodiment, a polygonal through groove 5-1 is formed on the upper surface of the base 5, which is matched with the polygonal protrusion 4-3, according to the present embodiment, as described with reference to fig. 8 and 9. The polygonal bulge 4-3 and the polygonal through groove 5-1 are in eight-equal-division convex or concave design, and are in gapless fit. The assembled assembly is embedded into the polygonal through groove 5-1 of the base through the polygonal bulge 4-3 of the workpiece seat, and the working fluid is prevented from being injected into the working cabin through the locking screw 6, so that the assembly and the base 5 axially float. When the next oil hole is processed, the locking screw 6 is unscrewed, the combination is rotated by a corresponding angle relative to the base 5, the combination is reinserted into the base 5, and the locking screw 6 is screwed.
Other compositions and connection relationships are the same as those of the first, second or third embodiments.
Fifth embodiment: the method for processing the stepped oil hole in the raceway overtravel groove according to the present embodiment will be described with reference to fig. 1 to 12, and includes the steps of:
step one, adjusting a tool:
1) Clamping the base 5 to a chuck of the turntable;
2) The polygonal bulge 4-3 of the workpiece seat 4 is inserted into the polygonal through groove 5-1 of the base 5, and the locking screw 6 penetrates through the side wall of the base 5 and then is connected with the polygonal bulge 4-3;
3) Sleeving a workpiece 3 on a workpiece seat 4 and a quick-release pressing plate 2;
4) Clamping the workpiece 3 through the first outer edge 2-2 of the quick-release pressing plate 2 and the second outer edge 4-2 of the workpiece seat 4;
5) The quick-release pressing plate 2, the workpiece 3 and the workpiece seat 4 are connected together through the positioning bolt 1 and are concentrically arranged;
6) A locking screw 6 penetrates through the side wall of the base 5 to be connected with the workpiece seat 4;
step two, calibrating the electrode:
1) Before machining, confirming parallelism of the electrode and the Z axis and coaxiality of the working surface of the electrode;
2) The electrode is arranged on the electrode clamp, two sections of cylindrical surfaces of the stepped electrode are measured by using a dial indicator, measuring points respectively prop against the cylindrical bus in the +X, -X, +Y and Y directions, and the electrode is moved in the Z direction;
3) The pointer swing of the dial indicator is smaller than 0.002mm and passes the calibration;
step three, aligning the workpiece:
the dial indicator contact is abutted against the end face or the outer diameter of the clamped workpiece, the workpiece is made to rotate for one circle, the axis clamping of the workpiece is confirmed to be horizontal or vertical, a machining coordinate system, a coordinate zero point and a safety plane are set by utilizing centering alignment and edge collision instructions, and the position and depth of a machining oil hole are determined;
step four: machining an oil hole of a workpiece;
step five: after one oil hole is machined, the locking screw 6 is unscrewed, the workpiece seat 4 rotates by a corresponding angle relative to the base 5, the base 5 is reinserted, the locking screw 6 is screwed, and the next oil hole is machined. Other compositions and connection relationships are the same as those of the first, second, third or fourth embodiments.
Specific embodiment six: in connection with the description of the present embodiment 6, the electrode described in the second step of the present embodiment includes a first cylindrical section 7, a conical section 8, a second cylindrical section 9 and a third cylindrical section 10, and the first cylindrical section 7, the conical section 8, the second cylindrical section 9 and the third cylindrical section 10 are sequentially connected from top to bottom. Other compositions and connection relationships are the same as those of the first, second, third, fourth or fifth embodiments.
Seventh embodiment: the present embodiment will be described with reference to fig. 10, in which the diameter of the second cylindrical section 9 is 0.74mm to 0.76mm. Other compositions and connection relationships are the same as those of the first, second, third, fourth, fifth or sixth embodiments.
Eighth embodiment: the present embodiment will be described with reference to fig. 10, wherein the diameter of the third cylindrical section 10 is 0.54mm to 0.56mm. The corresponding discharge gaps of the second cylindrical section 9 and the third cylindrical section 10 are the same, preferably in the range of 0.065mm-0.075mm, and the cylindricity and concentricity of the second cylindrical section 9 and the third cylindrical section 10 are controlled within 0.005 mm. Other compositions and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth or seventh embodiments.
Discharge parameter optimization
In order to reduce the depth of the remelting layer, reduce the surface roughness value, reduce the electrode loss, improve the processing quality, carry out the optimization setting to the discharge parameter, the main optimization items are surface roughness, electrode loss and processing speed priority, and the minimum white layer. The comparison of specific discharge parameters before and after optimization is shown in table 1.
Table 1: comparison table for discharge parameters before and after optimization
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (4)
1. The machining method for the stepped oil hole in the rolling way overtravel groove adopts a tool for machining the stepped oil hole in the rolling way overtravel groove, wherein the tool for machining the stepped oil hole in the rolling way overtravel groove comprises a positioning bolt (1), a quick release plate (2), a workpiece seat (4), a base (5) and a locking screw (6), a quick release pressing plate (2), the workpiece seat (4) and the base (5) are sequentially sleeved on the positioning bolt (1) from top to bottom, a workpiece (3) is sleeved on the quick release plate (2) and the workpiece seat (4), and the locking screw (6) penetrates through the side wall of the base (5) to be connected with the workpiece seat (4); the quick-release pressing plate (2) is a disc body, a through hole (2-1) for penetrating through the positioning bolt (1) is formed in the upper surface of the quick-release pressing plate (2), and a first outer edge (2-2) extending outwards horizontally is formed in the upper surface of the quick-release pressing plate (2); the upper surface of the workpiece seat (4) is provided with a screw hole (4-1) matched with the positioning bolt (1), the lower surface of the workpiece seat (4) is provided with a second outer edge (4-2) extending outwards horizontally, and the middle part of the lower surface of the second outer edge (4-2) is provided with a polygonal bulge (4-3); the upper surface of the base (5) is provided with a polygonal through groove (5-1) matched with the polygonal protrusion (4-3);
the method is characterized in that: the processing method for processing the stepped oil hole in the raceway overrun groove comprises the following steps:
step one, adjusting a tool:
1) Clamping the base (5) to a chuck of the turntable;
2) The polygonal bulge (4-3) of the workpiece seat (4) is inserted into the polygonal through groove (5-1) of the base (5), and the locking screw (6) penetrates through the side wall of the base (5) and then is connected with the polygonal bulge (4-3);
3) Sleeving a workpiece (3) on a workpiece seat (4) and a quick-release pressing plate (2);
4) Clamping a workpiece (3) through a first outer edge (2-2) of the quick-release pressing plate (2) and a second outer edge (4-2) of the workpiece seat (4);
5) The quick pressure relief plate (2), the workpiece (3) and the workpiece seat (4) are connected together through the positioning bolt (1) and concentrically arranged;
6) The locking screw (6) penetrates through the side wall of the base (5) to be connected with the workpiece seat (4);
step two, calibrating the electrode:
1) Before machining, confirming parallelism of the electrode and the Z axis and coaxiality of the working surface of the electrode;
2) The electrode is arranged on the electrode clamp, two sections of cylindrical surfaces of the stepped electrode are measured by using a dial indicator, measuring points respectively prop against the cylindrical bus in the +X, -X, +Y and Y directions, and the electrode is moved in the Z direction;
3) The pointer swing of the dial indicator is smaller than 0.002mm and passes the calibration;
step three, aligning the workpiece:
the dial indicator contact is abutted against the end face or the outer diameter of the clamped workpiece, the workpiece is made to rotate for one circle, the axis clamping of the workpiece is confirmed to be horizontal or vertical, a machining coordinate system, a coordinate zero point and a safety plane are set by utilizing centering alignment and edge collision instructions, and the position and depth of a machining oil hole are determined;
step four: machining an oil hole of a workpiece;
step five: after one oil hole is machined, the locking screw (6) is unscrewed, the workpiece seat (4) rotates by a corresponding angle relative to the base (5), the base (5) is reinserted, and the locking screw (6) is screwed to machine the next oil hole.
2. The method for machining the stepped oil hole in the raceway overrun groove according to claim 1, characterized in that: the electrode in the second step comprises a first cylindrical section (7), a cone section (8), a second cylindrical section (9) and a third cylindrical section (10), wherein the first cylindrical section (7), the cone section (8), the second cylindrical section (9) and the third cylindrical section (10) are sequentially connected from top to bottom.
3. The method for machining the stepped oil hole in the raceway overrun groove according to claim 2, characterized in that: the diameter of the second cylindrical section (9) is 0.74mm-0.76mm.
4. The method for machining the stepped oil hole in the raceway overrun groove according to claim 2, characterized in that: the diameter of the third cylindrical section (10) is 0.54mm-0.56mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137620.6A CN113732421B (en) | 2021-09-27 | 2021-09-27 | Tool for machining stepped oil hole in raceway over-travel groove and electric spark machining method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137620.6A CN113732421B (en) | 2021-09-27 | 2021-09-27 | Tool for machining stepped oil hole in raceway over-travel groove and electric spark machining method |
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| CN113732421A CN113732421A (en) | 2021-12-03 |
| CN113732421B true CN113732421B (en) | 2023-09-29 |
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| CN109483262A (en) * | 2018-11-21 | 2019-03-19 | 中国航发哈尔滨轴承有限公司 | It is a kind of for processing the mold and processing method of the Main Shaft Bearing of Engine inner ring containing internal diameter oil groove |
| CN213795431U (en) * | 2020-10-30 | 2021-07-27 | 中国船舶重工集团公司第七0七研究所 | High-precision clamping and positioning device for turning of revolving body part |
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