CN111515633B - Method for machining spatial oblique key groove of guide roller support - Google Patents

Method for machining spatial oblique key groove of guide roller support Download PDF

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Publication number
CN111515633B
CN111515633B CN202010489907.4A CN202010489907A CN111515633B CN 111515633 B CN111515633 B CN 111515633B CN 202010489907 A CN202010489907 A CN 202010489907A CN 111515633 B CN111515633 B CN 111515633B
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screw hole
pin
plane
key groove
bottom plate
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CN111515633A (en
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李忠生
周翔
姜自新
何金光
贾玲
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Sichuan Hongjian Heavy Machinery Manufacturing Co ltd
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Sichuan Hongjian Heavy Machinery Manufacturing Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The invention relates to a method for processing a spatial oblique key groove of a guide roller support, which comprises the following steps: a. projecting the screw hole to a vertical sectioning plane where the central connecting line of the two pin holes (4) is located according to the part drawing, and calculating the coordinate size of the screw hole; b. processing an upper plane (2) and a lower plane (3) of the bottom plate (1); c. two pin holes (4) are drilled and hinged on the right side of the bottom plate (1) by the boring machine, and pin shafts (5) are arranged in the pin holes (4); d. milling the inner side surface of the support plate; e. drilling a twisted screw hole on the inner side surface; f. a straight pin is arranged in the screw hole; g. finding that the outer side straight pin II (16) and the outer side straight pin IV (18) are in the same straight line by using a dial indicator; h. and milling an inclined key groove once by using a tool setting machine. The method comprises the steps of processing a bottom plate plane and two pin holes to serve as positioning references, calculating the coordinate sizes of each screw hole, the bottom plate plane and the two pin holes, aligning, and taking the center of a key groove to perform one-step processing forming. The problems that the conventional scribing method is rough and has large operation and measurement errors are solved; the production cost of purchasing a processing center separately is high.

Description

Method for machining spatial oblique key groove of guide roller support
Technical Field
The invention relates to a method for processing a spatial oblique key groove of a guide roller support, belonging to the field of metallurgical equipment manufacturing.
Background
The guide roller support is of a frame structure and is formed by a bottom plate and eight support plates, a square hole is formed in the middle of the bottom plate, the eight support plates are welded on four sides of the square hole, and each side of the eight support plates is provided with two support plates. The right of the bottom plate is provided with 2 pin holes, each support plate is provided with 4 bolt through holes and 2 key grooves, the diameter of each bolt is free size, the requirement on surface roughness is not high, the two key grooves of the two support plates on the same side block are respectively on the same central line, and the bolt holes are parallel to the key grooves and are symmetrically distributed. The positions of the two key grooves are the same. The key groove and the bottom plate form a spatial relation, the angle and distance position precision of the center of the key groove and the bottom plate is high, but the angle and distance position precision cannot be directly measured, and the machining control is accurate and difficult. The product is generally processed by adopting a marking, a special manufacturing tool or a numerical control processing center. The scribing method is rough and has large operation and measurement errors. And a special tool for machining and manufacturing of the numerical control machining center is purchased, so that the production cost is high.
Disclosure of Invention
The invention aims to solve the technical problems that the angle and the distance of the spatial inclined key groove of the guide roller support can not be measured, are accurate and difficult to control, and have high production cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for processing a spatial oblique key groove of a guide roller support is characterized by comprising the following steps:
a. projecting a first screw hole, a second screw hole, a third screw hole and a fourth screw hole on the first support plate and the second support plate onto a plane vertical to a central connecting line of the two pin holes according to a part drawing, and calculating coordinates in a rectangular coordinate system formed by projecting the upper plane of the first screw hole, the second screw hole, the third screw hole and the fourth screw hole on the bottom plate and the plane which passes through the connecting line of the two pin holes and is vertical to the upper plane onto the plane vertical to the central connecting line of the two pin holes;
b. processing an upper plane and a lower plane of the bottom plate, wherein the upper plane and the lower plane are arranged in parallel;
c. vertically placing the bent plate on a rotary workbench, enabling the lower plane of the bottom plate to be back to the bent plate and the upper plane to face a boring bar of a boring machine, aligning the upper plane and then pressing the bottom plate on the bent plate, drilling and reaming two pin holes in the right side of the bottom plate by the boring machine according to the coordinate size, wherein the axes of the pin holes are vertical to the upper plane or the lower plane of the bottom plate, and after drilling is finished, pin shafts are arranged in the pin holes and are in transition fit with the pin holes;
d. replacing a boring cutter of a boring machine with a milling head, and clamping and processing the inner side surfaces I and II of the first bearing plate and the second bearing plate by a cutter head at one time, wherein the inner side surfaces I and II are coplanar and vertical to the central connecting line of the two pin shafts;
e. the boring machine drills and twists the first screw hole, the second screw hole, the third screw hole and the fourth screw hole on the first inner side surface and the second inner side surface according to the coordinates of the first screw hole, the second screw hole, the third screw hole and the fourth screw hole by taking the central connecting line of the pin shaft and the upper plane as a X, Y-axis rectangular coordinate system, and the axes of the first screw hole, the second screw hole, the third screw hole and the fourth screw hole are perpendicular to the first inner side surface or the second inner side surface;
f. a first straight pin, a second straight pin, a third straight pin and a fourth straight pin are arranged in the first screw hole, the second screw hole, the third screw hole and the fourth screw hole and are in transition fit with the corresponding screw holes respectively, and the first straight pin, the second straight pin, the third straight pin and the fourth straight pin are correspondingly superposed with the four axial lines of the first screw hole, the second screw hole, the third screw hole and the fourth screw hole;
g. keeping the clamping state of the bottom plate and the bent plate unchanged, rotating the workbench, and finding out that the outer straight pin II and the outer straight pin IV are in the same straight line by using a dial indicator of the boring machine;
h. and (5) milling the inclined key groove I and the inclined key groove II once by using a forming milling cutter to perform tool setting according to the midpoint of the connecting line of the straight pin I and the straight pin II.
Wherein, in the step b, the upper plane and the lower plane of the bottom surface are processed by a planer.
In the method, the bending plate in the step c is in a right-angled triangle structure, one right-angled edge is abutted against the upper plane of the rotary workbench, and the other right-angled edge is abutted against the lower plane of the bottom plate.
In the method, the upper deviation of the pitch between the two pin holes in the step c is 0.05, and the lower deviation is 0.
In the method, the first screw hole, the second screw hole, the third screw hole and the fourth screw hole are of fine hole structures.
The invention has the beneficial effects that: the method designs the screw holes as the process reference, indirectly ensures the angle and the distance of the inclined key groove by ensuring the position precision of each screw hole, has simple operation, does not need expensive special machine tools and special tools, reduces the production cost, and overcomes the defects of low marking processing precision and large error. The invention has important reference function for solving the problems of measurement and precision control of the space processing surface and provides a brand new idea.
Drawings
FIG. 1 is a schematic view of a guide roll support of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1 according to the present invention;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1 according to the present invention;
FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 2 according to the present invention;
FIG. 5 is a schematic cross-sectional view taken along line D-D of FIG. 2 according to the present invention.
Labeled as: 1 is a bottom plate, 2 is an upper plane, 3 is a lower plane, 4 is a pin hole, 5 is a pin shaft, 6 is a bent plate, 7 is a first support plate, 8 is a second support plate, 9 is a first inner side surface, 10 is a second inner side surface, 11 is a first screw hole, 12 is a second screw hole, 13 is a third screw hole, 14 is a fourth screw hole, 15 is a first straight pin, 16 is a second straight pin, 17 is a third straight pin, 18 is a fourth straight pin, 19 is a central line, 20 is a first inclined key groove, and 21 is a second inclined key groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, a method for processing a spatial inclined key groove of a guide roller support comprises the following steps:
a. projecting a screw hole I11, a screw hole II 12, a screw hole III 13 and a screw hole IV 14 on a first support plate 7 and a second support plate 8 onto a plane vertical to the central connecting line of the two pin holes 4 according to a part drawing, and calculating coordinates in a rectangular coordinate system formed by projecting the screw hole I11, the screw hole II 12, the screw hole III 13 and the screw hole IV 14 onto a plane which is vertical to the central connecting line of the two pin holes 4 on an upper plane 2 of the bottom plate 1 and a plane which passes through the connecting line of the two pin holes 4 and is vertical to the upper plane 2;
b. processing an upper plane 2 and a lower plane 3 of a bottom plate 1, wherein the upper plane 2 and the lower plane 3 are arranged in parallel;
c. vertically placing a bent plate 6 on a rotary workbench, enabling a lower plane 3 of a bottom plate 1 to be back against the bent plate 6, enabling an upper plane 2 to face a boring rod of a boring machine, aligning the upper plane 2, then pressing the bottom plate 1 on the bent plate 6, drilling and reaming two pin holes 4 on the right side of the bottom plate 1 by the boring machine according to the coordinate size, enabling the axes of the pin holes 4 to be vertical to the upper plane 2 or the lower plane 3 of the bottom plate 1, installing pin shafts 5 in the pin holes 4 after drilling is completed, enabling the pin shafts 5 to be in transition fit with the pin holes 4, and enabling the axes of the pin shafts 5 to be vertical to the upper plane 2;
d. replacing a boring cutter of the boring machine with a milling head, clamping and processing the inner side surfaces 9 and 10 of the first bearing plate 7 and the second bearing plate 8 by a cutter head at one time, wherein the inner side surfaces 9 and 10 are coplanar and vertical to the central connecting line of the two pin shafts 5;
e. b, drilling and twisting a screw hole I11, a screw hole II 12, a screw hole III 13 and a screw hole IV 14 on the inner side surface I9 and the inner side surface II 10 according to the coordinates of the screw hole I11, the screw hole II 12, the screw hole III 13 and the screw hole IV 14 by using the boring machine in the rectangular coordinate system in the step a, wherein the axes of the screw hole I11, the screw hole II 12, the screw hole III 13 and the screw hole IV 14 are vertical to the inner side surface I9 or the inner side surface II 10;
f. a first straight pin 15, a second straight pin 16, a third straight pin 17 and a fourth straight pin 18 are arranged in the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14 and are in transition fit with the corresponding screw holes respectively, and the first straight pin 15, the second straight pin 16, the third straight pin 17 and the fourth straight pin 18 are correspondingly overlapped with the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14;
g. keeping the clamping state of the bottom plate 1 and the bent plate 6 unchanged, rotating the workbench, and finding the outer straight pin II 16 and the outer straight pin IV 18 to be in the same straight line by using a dial indicator of the boring machine;
h. and (3) milling the first inclined key groove 20 and the second inclined key groove 21 once by using a forming milling cutter to press the midpoint of the connecting line of the first straight pin 15 and the second straight pin 16. As will be understood by those skilled in the art, the upper plane 2, the lower plane 3 and the two pin holes 4 of the bottom plate 1 are machined as positioning references. Then the inner side of 8 support plates is processed. And then, projecting the screw hole of the support plate at the side of 20 sides of the inclined key groove to be processed to a plane vertical to the connecting line of the two pin holes 4 according to a part drawing, wherein the vertical bisector of the connecting line of the two pin holes 4 is preferably positioned on the cutting plane. Calculating the coordinate sizes of each screw hole, the plane of the bottom plate 1 and the two pin holes 4, processing common screw holes according to tolerance and the refined holes, and processing each screw hole according to the calculated coordinates. And taking the centers of two straight pins on one side of the key groove as a reference to be straightened, taking half of the distance between screw holes on two sides of the key groove as the center of the key groove, and finishing by using a milling cutter at one time. Referring to fig. 1, specifically, a first screw hole 11, a second screw hole 12, a third screw hole 13 and a fourth screw hole 14 to be processed by a first support plate 7 and a second support plate 8 are projected onto a plane perpendicular to a line connecting two pin holes 4, and then a plane perpendicular to the upper plane 2 and a line connecting two pin holes 4 is projected onto the plane (a plane perpendicular to a line connecting two pin holes 4), since the upper plane 2 and a plane perpendicular to the upper plane 2 and passing two pin holes 4 are projected as lines, and the two lines can form a rectangular coordinate system, at this time, rectangular coordinates of the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14 in the rectangular coordinate system are calculated and used as a process reference for processing a first inclined key groove 20 and a second inclined key groove 21. And then, the bottom plate 1 is horizontally placed to be divided into a rough surface and a fine surface, namely an upper plane 2 and a lower plane 3, and the upper surface and the lower surface are parallel, and the upper plane 2 can be used as a positioning reference of the screw hole I11, the screw hole II 12, the screw hole III 13 and the screw hole IV 14 in the rectangular coordinate shape in the Y direction after projection. Referring to fig. 5, the bending plate 6 is vertically placed on the rotary worktable, the lower plane 3 of the bottom plate 1 leans against the bending plate 6, the upper plane 2 faces the boring bar, and the two pin holes 4 are in the upper and lower directions on the right side, so that the central lines of the two pin holes 4 are still vertical after the worktable rotates. After the upper plane 2 is aligned, a pressing plate and a bolt are used for pressing the bottom plate 1 on the bent plate 6, a boring machine drills and reams two pin holes 4 according to the coordinate size, the two pin holes are perpendicular to the upper plane 2 and the lower plane 3 of the bottom plate 1, the hole distance tolerance is guaranteed, and the plane perpendicular to the upper plane 2 through the connecting line of the two pin holes 4 is projected to serve as a positioning reference of a screw hole I11, a screw hole II 12, a screw hole III 13 and a screw hole IV 14 in the X direction; keeping the processing state unchanged, 2 pin shafts 5 are driven into the pin holes 4 in the direction of the upper plane 2, and the pin shafts 5 are in transition fit with the pin holes 4, so that the positions of the pin shafts 5 and the pin holes 4 are ensured to be consistent, the measurement is convenient, and the disassembly is convenient; continuously keeping the working position, clamping and processing the inner side surface I9 and the inner side surface II 10 of the support plate by a cutter disc for changing the milling head of the boring machine at one time, wherein the inner side surface I9 and the inner side surface II 10 are on the same plane and are vertical to the connecting line of the two pin shafts 5, and ensuring that the axis of the mounting roller is vertical to the central line of the two pin shafts 5; keeping the working position, using the pin shaft 5 and the upper plane 2 as X, Y references, ensuring hole position accuracy according to coordinate size by a boring machine, drilling and reaming a first screw hole 11, a second screw hole 12, a third screw hole 13 and a fourth screw hole 14 respectively, and enabling the hole diameters of the screw holes to be perpendicular to the inner side surfaces 9 and 10 of the supporting plate, and machining the hole diameters of the screw holes according to tolerance to serve as machining process references of the first inclined key groove 20 and the second inclined key groove 21. And with reference to fig. 3 and 4, continuously keeping the working position, and respectively and correspondingly matching the first straight pin 15, the second straight pin 16, the third straight pin 17 and the fourth straight pin 18 with the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14 in a transition manner, so that the positions of the pin shaft 5 and the screw holes are consistent, the measurement is convenient, and the disassembly is convenient. With reference to fig. 5, keeping the working position, rotating the workbench, and finding out that the second outer straight pin 16 and the fourth outer straight pin 18 are in the same straight line by using a dial indicator according to fig. 1, 2 and 3, so as to ensure that the central line 19 of the inclined key groove is parallel to the central lines of the second straight pin 16 and the fourth straight pin 18 after processing, namely, the angle of the inclined key groove relative to the bottom plate 1 is ensured; keeping the working position, milling the first inclined key groove 20 and the second inclined key groove 21 once by using a forming milling cutter according to the center point of the connecting line of the first straight pin 15 and the second straight pin 16, and ensuring the concentricity of the two key grooves, namely ensuring the height of the inclined key groove relative to the bottom plate 1 and the distance between the inclined key groove and the pin hole 4. The oblique key grooves on the rest bearing plates can be machined by repeating the steps, and the machining mode can ensure the machining precision.
Preferably, in the above method, in the step b, the upper plane 2 and the lower plane 3 of the base plate 1 are machined by a planer. As will be understood by those skilled in the art, since the upper plane 2 and the lower plane 3 of the base plate 1 are used as reference surfaces and the flatness requirement is high, the method preferably uses a planer to machine the upper plane 2 and the lower plane 3 of the base plate 1, and roughens and finishes the upper plane 3 and the lower plane 3 to reduce the deformation and make the upper plane and the lower plane parallel.
Preferably, the bending plate 6 in the step c of the above method is in a right-angled triangle structure, and one right-angled side abuts against the upper plane 2 of the rotary table, and the other right-angled side abuts against the lower plane 3 of the bottom plate 1. It will be appreciated by those skilled in the art that for purposes of this method and positioning, the angle plate 6 is preferably of a right triangle configuration with one leg abutting the upper surface 2 of the turntable and the other leg abutting the lower surface 3 of the base plate 1.
Preferably, in the above method, in step c, the upper deviation of the pitch between the two pin holes 4 is 0.05, and the lower deviation is 0. As will be understood by those skilled in the art, in order to ensure the positioning accuracy, the upper deviation and the lower deviation of the pitch between the two pin holes 4 are preferably 0.05 and 0, respectively, in the present method.
Preferably, in the above method, the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14 are fine hole structures. As will be appreciated by those skilled in the art, in order to ensure the accuracy of the reference, the method preferably processes the first screw hole 11, the second screw hole 12, the third screw hole 13 and the fourth screw hole 14 into a precise hole structure for accurate positioning.

Claims (5)

1. A method for processing a spatial oblique key groove of a guide roller support is characterized by comprising the following steps:
a. projecting a screw hole I (11), a screw hole II (12), a screw hole III (13) and a screw hole IV (14) on a first support plate (7) and a second support plate (8) onto a plane vertical to a central connecting line of two pin holes (4) according to a part diagram, and calculating coordinates of the screw hole I (11), the screw hole II (12), the screw hole III (13) and the screw hole IV (14) in a rectangular coordinate system formed by projecting the plane which is perpendicular to an upper plane (2) and passes through a connecting line of the two pin holes (4) and is perpendicular to the upper plane (2) onto the plane vertical to the central connecting line of the two pin holes (4);
b. processing an upper plane (2) and a lower plane (3) of a bottom plate (1), wherein the upper plane (2) and the lower plane (3) are arranged in parallel;
c. vertically placing a bent plate (6) on a rotary workbench, enabling a lower plane (3) of a bottom plate (1) to be back against the bent plate (6) and an upper plane (2) to face a boring bar of a boring machine, pressing the bottom plate (1) on the bent plate (6) after the upper plane (2) is aligned, drilling and reaming two pin holes (4) on the right side of the bottom plate (1) according to the coordinate size by the boring machine, enabling the axes of the pin holes (4) to be vertical to the upper plane (2) or the lower plane (3) of the bottom plate (1), installing pin shafts (5) in the pin holes (4) after drilling is completed, enabling the pin shafts (5) to be in transition fit with the pin holes (4), and enabling the axes of the pin shafts (5) to be vertical to the upper plane (2);
d. replacing a boring cutter of a boring machine with a milling head, clamping and processing the inner side surfaces I (9) and II (10) of the first bearing plate (7) and the second bearing plate (8) by a cutter head at one time, wherein the inner side surfaces I (9) and II (10) are coplanar and are vertical to a connecting line of the centers of the two pin shafts (5);
e. b, drilling and twisting the screw hole I (11), the screw hole II (12), the screw hole III (13) and the screw hole IV (14) on the inner side surface I (9) and the inner side surface II (10) according to the coordinates of the screw hole I (11), the screw hole II (12), the screw hole III (13) and the screw hole IV (14) by the boring machine in a rectangular coordinate system in the step a, wherein the axes of the screw hole I (11), the screw hole II (12), the screw hole III (13) and the screw hole IV (14) are perpendicular to the inner side surface I (9) or the inner side surface II (10);
f. a first straight pin (15), a second straight pin (16), a third straight pin (17) and a fourth straight pin (18) are respectively installed in the first screw hole (11), the second screw hole (12), the third screw hole (13) and the fourth screw hole (14) and are in transition fit with the corresponding screw holes, and the first straight pin (15), the second straight pin (16), the third straight pin (17) and the fourth straight pin (18) are correspondingly superposed with the axes of the first screw hole (11), the second screw hole (12), the third screw hole (13) and the fourth screw hole (14);
g. keeping the clamping state of the bottom plate (1) and the bent plate (6) unchanged, rotating the workbench, and using a dial indicator for a boring machine to find the outer side straight pin II (16) and the outer side straight pin IV (18) to be in the same straight line;
h. and (3) milling the inclined key groove I (20) and the inclined key groove II (21) once by using a forming milling cutter to perform tool setting according to the midpoint of the connecting line of the straight pin I (15) and the straight pin II (16).
2. The method for machining the spatial inclined key groove of the guide roller support according to claim 1, wherein the method comprises the following steps of: and in the step b, machining an upper plane (2) and a lower plane (3) of the bottom surface by using a planer.
3. The method for machining the spatial inclined key groove of the guide roller support according to claim 1, wherein the method comprises the following steps of: and the bent plate (6) in the step c is of a right-angled triangle structure, one right-angled edge is abutted against the upper plane (2) of the rotary workbench, and the other right-angled edge is abutted against the lower plane (3) of the bottom plate (1).
4. The method for machining the spatial inclined key groove of the guide roller support according to claim 1, wherein the method comprises the following steps of: in the step c, the upper deviation of the pitch between the two pin holes (4) is 0.05, and the lower deviation is 0.
5. The method for machining the spatial inclined key groove of the guide roller support according to claim 1, wherein the method comprises the following steps of: the first screw hole (11), the second screw hole (12), the third screw hole (13) and the fourth screw hole (14) are of fine hole structures.
CN202010489907.4A 2020-06-02 2020-06-02 Method for machining spatial oblique key groove of guide roller support Active CN111515633B (en)

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CN111515633B true CN111515633B (en) 2022-03-22

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GB2116083A (en) * 1982-02-26 1983-09-21 Gen Electric Drill with disposable inserts
CN102489937A (en) * 2011-11-15 2012-06-13 中电电机股份有限公司 Machining process for symmetric key grooves of motor shaft extension and fixture for same
CN102909520A (en) * 2011-08-05 2013-02-06 广西玉柴机器股份有限公司 Crankshaft large-rounded-corner roller clip and machining method thereof
CN103056614A (en) * 2012-12-25 2013-04-24 宜昌中冶重工机械有限公司 Method for processing curved surface sector-shaped section frame
CN104097033A (en) * 2014-06-30 2014-10-15 什邡市明日宇航工业股份有限公司 Manufacturing process for integral irregular welding box section of advanced training machine
CN106392498A (en) * 2016-11-25 2017-02-15 陕西启源科技发展有限责任公司 Special-shaped surface part machining method

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JPH09300120A (en) * 1996-05-21 1997-11-25 Sankyo Seiki Mfg Co Ltd Jig for machining groove at inner surface of hole
CN108788208B (en) * 2018-06-19 2021-06-01 杭州前进齿轮箱集团股份有限公司 Boring method for machining intersection angle box hole system
CN208945643U (en) * 2018-09-26 2019-06-07 西安昆仑工业(集团)有限责任公司 A kind of ring parts inside skewed slot, which is processed, uses fraise jig

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116083A (en) * 1982-02-26 1983-09-21 Gen Electric Drill with disposable inserts
CN102909520A (en) * 2011-08-05 2013-02-06 广西玉柴机器股份有限公司 Crankshaft large-rounded-corner roller clip and machining method thereof
CN102489937A (en) * 2011-11-15 2012-06-13 中电电机股份有限公司 Machining process for symmetric key grooves of motor shaft extension and fixture for same
CN103056614A (en) * 2012-12-25 2013-04-24 宜昌中冶重工机械有限公司 Method for processing curved surface sector-shaped section frame
CN104097033A (en) * 2014-06-30 2014-10-15 什邡市明日宇航工业股份有限公司 Manufacturing process for integral irregular welding box section of advanced training machine
CN106392498A (en) * 2016-11-25 2017-02-15 陕西启源科技发展有限责任公司 Special-shaped surface part machining method

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