CN111730085B - Workpiece centering device and centering method suitable for low-precision cylindrical inner hole - Google Patents
Workpiece centering device and centering method suitable for low-precision cylindrical inner hole Download PDFInfo
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- CN111730085B CN111730085B CN202010700363.1A CN202010700363A CN111730085B CN 111730085 B CN111730085 B CN 111730085B CN 202010700363 A CN202010700363 A CN 202010700363A CN 111730085 B CN111730085 B CN 111730085B
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
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Abstract
The invention relates to the technical field of machinery, in particular to a workpiece centering device suitable for a low-precision cylindrical inner hole, which comprises a cover plate, an upper movable taper sleeve, an upper connecting disc, a screw rod, a middle connecting frame, a lower supporting frame, a lower movable taper sleeve and a telescopic positioning claw, wherein the upper connecting disc is arranged on the upper connecting disc; the cover plate comprises an upper cover plate, an inner cover plate and a lower cover plate; the upper coupling disc, the middle connecting frame and the lower supporting frame are connected with each other through bolts and screws from top to bottom along the vertical direction to form a cavity; the upper movable taper sleeve, the screw rod and the lower movable taper sleeve are sequentially connected from top to bottom along the vertical direction; the upper part of the upper movable taper sleeve is connected with the upper cover plate; the lower part of the upper movable taper sleeve is connected with the inner cover plate to form a clamping groove; the upper end of the screw rod is in a convex shape and is arranged in the clamping groove; the invention has simple structural design and easy operation, expands the application range of the expansion sleeve type positioning device, is suitable for processing various workpieces to be processed with inner hole positioning, and has low requirement on the precision of the inner hole of the workpiece to be processed.
Description
The invention patent named as a wedge inner expansion type centering device and a centering method is a divisional application carried out by taking an invention patent with the application date of 2017, 11/1 and the application number of 201711059685.7 as a parent.
Technical Field
The invention relates to the technical field of machinery, in particular to a workpiece centering device and a centering method suitable for a low-precision cylindrical inner hole.
Background
At present, when a workpiece with an inner hole as a positioning reference is machined, an expansion sleeve type positioning device is generally adopted, and the principle of the expansion sleeve type positioning device is that a bolt is rotated to enable a pressing plate to press an expansion sleeve downwards and expand the expansion sleeve outwards, so that the inner hole of the workpiece is tightly supported, and accurate positioning is achieved. The expansion sleeve is uniformly expanded outwards, so the positioning mode is very suitable for positioning a workpiece with a finish-machined inner hole, the roundness and the cylindricity of the finish-machined inner hole are good, the precision is high, meanwhile, the excircle of the expansion sleeve is processed by a grinding machine, the roundness and the cylindricity are good, and the diameter size of the excircle of the expansion sleeve is the same as that of the positioning inner hole of the workpiece, so when the expansion sleeve is expanded outwards, the excircle surface of the expansion sleeve can be in good contact with the inner surface of the inner hole, and the central axis of the inner hole of the workpiece can be ensured to be coincident with the central axis of the positioning device. First, when the roundness of the inner hole of the workpiece is not ideal, the outer surface of the expansion sleeve cannot be in good contact with the inner surface of the inner hole of the workpiece when the expansion sleeve expands outwards, and a gap is generated; second, when the cylindricity of the hole is not ideal, there is also a tight hold at one end of the hole and no contact at the other end, both of which can cause the workpiece to move during machining. Therefore, the expanding sleeve type positioning device has higher requirement on the precision of positioning the inner hole and is not suitable for positioning a workpiece with unsatisfactory inner hole precision.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the workpiece centering device is suitable for finish machining of an inner hole and a low-precision cylindrical inner hole with an imperfect inner hole, and the method for machining the workpiece by using the workpiece centering device suitable for the low-precision cylindrical inner hole is also provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a workpiece centering device suitable for a low-precision cylindrical inner hole comprises a cover plate, an upper movable taper sleeve, an upper connecting disc, a screw rod, a middle connecting frame, a lower supporting frame, a lower movable taper sleeve and a telescopic positioning claw;
the cover plate comprises an upper cover plate, an inner cover plate and a lower cover plate; the upper coupling plate, the middle coupling frame and the lower support frame are connected with each other through bolts and screws from top to bottom along the vertical direction to form a cavity;
the upper movable taper sleeve, the screw rod and the lower movable taper sleeve are sequentially connected from top to bottom along the vertical direction; the upper part of the upper movable taper sleeve is connected with the upper cover plate; the lower part of the upper movable taper sleeve is connected with the inner cover plate to form a clamping groove; the upper end of the screw rod is in a convex shape and is arranged in the clamping groove; the lower end of the lower movable taper sleeve is connected with the lower cover plate;
the upper movable taper sleeve, the inner cover plate, the screw rod and the lower movable taper sleeve are sleeved in the cavity; the upper movable taper sleeve is connected with the upper connecting disc; the lower movable taper sleeve is connected with the lower support frame;
the telescopic positioning claw comprises an upper telescopic positioning claw and a lower telescopic positioning claw; the upper telescopic positioning claw is connected with the outer surface of the lower part of the upper movable taper sleeve and is arranged between the upper connecting disc and the upper end of the middle connecting frame; the lower telescopic positioning claw is connected with the outer surface of the upper part of the lower movable taper sleeve and is arranged between the lower end of the middle connecting frame and the lower supporting frame; the number of the upper telescopic positioning claws and the number of the lower telescopic positioning claws are respectively three.
Furthermore, a spring and a spring catch pin are arranged between the upper telescopic positioning claw and the lower telescopic positioning claw.
Furthermore, the three upper telescopic positioning claws and the three lower telescopic positioning claws are respectively and uniformly distributed on the circumferential plane where the upper telescopic positioning claws and the lower telescopic positioning claws are located, and the three upper telescopic positioning claws and the three lower telescopic positioning claws are arranged in a staggered mode by 30 degrees.
Furthermore, the number of the upper telescopic positioning claws and the number of the lower telescopic positioning claws can be only three, the extension of the three upper telescopic positioning claws must be synchronous, and the extension of the three lower telescopic positioning claws must be synchronous.
Furthermore, the extension of the three upper telescopic positioning claws and the extension of the three lower telescopic positioning claws cannot be linked.
Furthermore, the upper movable taper sleeve and the upper connecting disc are connected through a key, and the lower movable taper sleeve and the lower support frame are connected through a key.
Furthermore, the middle connecting frame, the upper connecting disc and the lower supporting frame are respectively provided with a positioning pin after being locked.
Further, the lower end of the lower cover plate is also provided with a locknut.
Furthermore, oil cups are arranged between the upper movable taper sleeve and the upper connecting disc, between the lower movable taper sleeve and the lower support frame, and at the upper telescopic positioning claw and the lower telescopic positioning claw.
In order to solve the technical problem, the invention adopts another technical scheme as follows: the wedge internal expanding type centering method is provided, the workpiece centering device suitable for the low-precision cylindrical inner hole is the workpiece centering device suitable for the low-precision cylindrical inner hole, and the method comprises the following steps of:
(1) hoisting a workpiece centering device suitable for the inner hole of the low-precision cylinder into a machine tool workbench, aligning and fixing;
(2) the method comprises the following steps that a workpiece to be processed is hung into a workpiece centering device suitable for a low-precision cylindrical inner hole, a screw rod is rotated through a handle, an upper movable taper sleeve and a lower movable taper sleeve are driven to do vertical linear motion, an upper telescopic positioning claw and a lower telescopic positioning claw extend outwards, the workpiece to be processed is aligned, and finally a locknut is locked;
(3) processing the processed workpiece by a machine tool;
(4) after the machining operation is finished, the locknut is loosened, the screw rod is reversely rotated through the handle, springs and spring stop pins are arranged in the middle of the upper telescopic positioning claw and the lower telescopic positioning claw, the upper telescopic positioning claw and the lower telescopic positioning claw are enabled to contract inwards through the springs arranged inside, and a machined piece is loosened and taken out.
The invention has the beneficial effects that: structural design is simple, high durability and convenient operation, rotate the screw rod through the handle, it is linear motion to drive movable taper sleeve and lower movable taper sleeve in the vertical direction respectively, through the upper and lower linear motion of last movable taper sleeve and lower movable taper sleeve, make three last flexible locating jaw and three lower flexible locating jaw outwards stretch out simultaneously or inwards contract simultaneously, adopt three point location's principle, make last flexible locating jaw and lower flexible locating jaw can the automatic correction by the central axis of processing work piece hole, reach the automatic positioning and the relaxation of being processed the work piece hole. The workpiece centering device applicable to the low-precision cylindrical inner hole expands the application range of the expansion sleeve type positioning device, is applicable to the processing of various processed workpieces with inner hole positioning, and has low precision requirement on the inner hole of the processed workpiece.
Drawings
FIG. 1 is a schematic structural diagram of a workpiece centering device for a low-precision cylindrical inner bore according to an embodiment of the present invention;
FIG. 2 is a top view of a workpiece centering device for a low precision cylindrical bore in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an upper telescopic positioning pawl of a workpiece centering device suitable for a low-precision cylindrical inner hole according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a lower retractable positioning pawl of a workpiece centering device for a low-precision cylindrical inner bore according to an embodiment of the present invention;
FIG. 5 is a schematic view of a workpiece centering device and fixture attachment for a low precision cylindrical bore in accordance with an embodiment of the present invention;
description of reference numerals:
1. a cover plate; 111. an upper cover plate; 112. an inner cover plate; 113. a lower cover plate; 2. an upper movable taper sleeve;
3. an upper coupling plate; 4. a screw; 5. a middle connecting frame; 6. a lower support frame; 7. a lower movable taper sleeve; 8. A telescopic positioning claw; 81. an upper telescopic positioning claw; 82. a lower telescopic positioning claw; 9. a spring; 10. a spring catch pin; 11. a key; 12. positioning pins; 13. a locknut; 14. a bolt; 15. a screw; 16. an oil cup; 17. A handle.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key concept of the invention is as follows: the utility model provides a work piece centring means suitable for low accuracy cylinder hole rotates the screw rod through handle 17, drives respectively and goes up movable taper sleeve and lower movable taper sleeve and do linear motion about vertical direction for three last flexible locating pawl and three lower flexible locating pawl outwards stretch out simultaneously or inwards shrink simultaneously, reach the automatic positioning and the release of being processed the work piece hole.
Referring to fig. 1 to 5, a workpiece centering device for a low-precision cylindrical inner hole includes a cover plate 1, an upper movable taper sleeve 2, an upper coupling plate 3, a screw 4, a middle coupling frame 5, a lower support frame 6, a lower movable taper sleeve 7 and a telescopic positioning claw 8;
the cover plate 1 comprises an upper cover plate 111, an inner cover plate 112 and a lower cover plate 113; the upper coupling plate 3, the middle coupling frame 5 and the lower support frame 6 are connected with each other from top to bottom along the vertical direction through bolts 14 and screws 15 to form a cavity;
the upper movable taper sleeve 2, the screw rod 4 and the lower movable taper sleeve 7 are sequentially connected from top to bottom along the vertical direction; the upper part of the upper movable taper sleeve 2 is connected with an upper cover plate 111; the lower part of the upper movable taper sleeve 2 is connected with the inner cover plate 112 to form a clamping groove; the upper end of the screw rod 4 is in a convex shape and is arranged in the clamping groove; the lower end of the lower movable taper sleeve 7 is connected with a lower cover plate 113;
the upper movable taper sleeve 2, the inner cover plate 112, the screw rod 4 and the lower movable taper sleeve 7 are arranged in the cavity; the upper movable taper sleeve 2 is connected with the upper connecting disc 3; the lower movable taper sleeve 7 is connected with the lower support frame 6;
the telescopic positioning claw 8 comprises an upper telescopic positioning claw 81 and a lower telescopic positioning claw 82; the upper telescopic positioning claw 81 is connected with the outer surface of the lower part of the upper movable taper sleeve 2 and is arranged between the upper connecting disc 3 and the upper end of the middle connecting frame 5; the lower telescopic positioning claw 82 is connected with the outer surface of the upper part of the lower movable taper sleeve 7 and is arranged between the lower end of the middle connecting frame 5 and the lower support frame 6; the number of the upper telescopic positioning claws 81 and the number of the lower telescopic positioning claws 82 are three respectively.
From the above description, the working process of the workpiece centering device suitable for the inner hole of the low-precision cylinder is as follows: when a workpiece to be machined is machined, the screw rod 4 is rotated through the handle 17, the upper movable taper sleeve 2 and the lower movable taper sleeve 7 are respectively driven to do linear motion in the vertical direction, the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 simultaneously extend outwards to lock inner holes of the workpiece to be machined through the vertical linear motion of the upper movable taper sleeve 2 and the lower movable taper sleeve 7, and a machine tool is opened for machining; after the processed workpiece is processed, the machine tool is closed, the screw rod 4 is rotated through the handle 17, the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 simultaneously contract inwards to loosen the inner hole of the processed workpiece through the vertical linear motion of the upper movable taper sleeve 2 and the lower movable taper sleeve 7, and the workpiece is taken out to complete the processing.
From the above description, the workpiece centering device applicable to the low-precision cylindrical inner hole has the beneficial effects that: structural design is simple, high durability and convenient operation, rotate screw rod 4 through handle 17, it is linear motion to drive activity taper sleeve 2 and lower activity taper sleeve 7 in vertical direction respectively, through the upper and lower linear motion of last activity taper sleeve 2 and lower activity taper sleeve 7, make three last flexible locating jaw 81 and three lower flexible locating jaw 82 outwards stretch out simultaneously or inwards shrink simultaneously, adopt three point location's principle, make the central axis that flexible locating jaw 81 and lower flexible locating jaw 82 can the automatic correction by the processing work piece hole, reach the automatic positioning and the release by the processing work piece hole. The workpiece centering device applicable to the low-precision cylindrical inner hole expands the application range of the expansion sleeve type positioning device, is applicable to the processing of various processed workpieces with inner hole positioning, and has low precision requirement on the inner hole of the processed workpiece.
Further, a spring 9 and a spring catch pin 10 are provided between the upper and lower telescopic positioning pawls 81 and 82.
As can be seen from the above description, the spring 9 and the spring stop pin 10 are arranged in the middle of the upper telescopic positioning claw 81 or the lower telescopic positioning claw 82, and the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82 can be extended outwards to lock the inner hole of the workpiece to be machined or retracted inwards to release the inner hole of the workpiece to be machined through the action of the spring 9 and the spring stop pin 10.
Further, the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are respectively and uniformly distributed on the circumferential plane, and the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are arranged in a staggered manner by 30 degrees.
As can be seen from the above description, the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are arranged by being staggered by 30 degrees, so that when the roundness of the processed workpiece is not good, the telescopic positioning claws 8 can be in contact with the inner hole of the processed workpiece in multiple directions, and the central axis of the inner hole of the processed workpiece can be better overlapped with the central axis of the workpiece centering device suitable for the low-precision cylindrical inner hole.
Further, the number of the upper telescopic positioning claws 81 and the number of the lower telescopic positioning claws 82 are only three, the extension of the three upper telescopic positioning claws 81 must be synchronized, and the extension of the three lower telescopic positioning claws 82 must be synchronized.
As can be seen from the above description, the number of the upper telescopic positioning claws 81 and the number of the lower telescopic positioning claws 82 can only be three, and at the same time, the extension of the three upper telescopic positioning claws 81 must be synchronized, and the extension of the three lower telescopic positioning claws 82 must be synchronized, so as to realize the three-point positioning principle, and to automatically correct the center line of the workpiece to be machined to coincide with the center line of the workpiece centering device suitable for the low-precision cylindrical inner hole by the synchronous extension of the three upper telescopic positioning claws 81 or the three lower telescopic positioning claws 82.
Further, the extension of the three upper telescopic positioning claws 81 and the extension of the three lower telescopic positioning claws 82 cannot be linked.
It can be known from the above description that the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 can not be linked, that is, only when the three upper telescopic positioning claws 81 are extended in place, the three lower telescopic positioning claws 82 can be extended outwards, or when the three lower telescopic positioning claws 82 are extended in place, the three upper telescopic positioning claws 81 can be extended outwards, and the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are not linked mainly to ensure that the upper telescopic positioning claws 81 and the lower telescopic positioning claws 82 can be contacted with the inner hole of the workpiece to be processed.
Further, the upper movable taper sleeve 2 is connected with the upper connecting disc 3 through a key 11, and the lower movable taper sleeve 7 is connected with the lower support frame 6 through a key 11.
From the above description, the upper movable taper sleeve 2 and the upper coupling disk 3, the lower movable taper sleeve 7 and the lower support frame 6 are all connected by the key 11, mainly for limiting the circumferential fixation between them, so that they can only do the up-and-down linear motion, and the rotation is limited.
Furthermore, the middle connecting frame 5, the upper connecting disc 3 and the lower supporting frame 6 are respectively provided with a positioning pin 12 after being locked.
As can be seen from the above description, after the middle connecting frame 5, the upper connecting plate 3 and the lower supporting frame 6 are locked, a positioning pin 12 is respectively provided, mainly to limit the rotational freedom degree in the horizontal plane, and further to lock the middle connecting frame 5, the upper connecting plate 3 and the lower supporting frame 6.
Further, a locknut 13 is further disposed at the lower end of the lower cover plate 113.
As can be seen from the above description, the anti-loose bolt 13 is disposed at the lower end of the lower cover plate 113, mainly for clamping the screw rod 4, so as to prevent the screw rod 4 from loosening during operation.
Further, oil cups 16 are arranged between the upper movable taper sleeve 2 and the upper connecting disc 3, between the lower movable taper sleeve 7 and the lower support frame 6, and at the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82.
From the above description, when the workpiece centering device suitable for the low-precision cylindrical inner hole is continuously used five times or six times, a proper amount of clean lubricating oil should be filled into the oil cups 16 at the movable parts such as the three upper telescopic positioning claws 81, the three lower telescopic positioning claws 82, the space between the upper movable taper sleeve 2 and the upper coupling plate 3, the space between the lower movable taper sleeve 7 and the lower support frame 6, and the like, which is beneficial to prolonging the service life of the device.
Referring to fig. 1 to 5, the present invention further provides a wedge internal expanding centering method, where the workpiece centering device for a low-precision cylindrical inner hole is the workpiece centering device for a low-precision cylindrical inner hole, and the method includes the following steps:
(1) hoisting a workpiece centering device suitable for the inner hole of the low-precision cylinder into a machine tool workbench, aligning and fixing;
(2) a workpiece to be processed is hung into a workpiece centering device suitable for a low-precision cylindrical inner hole, the screw rod 4 is rotated through the handle 17, the upper movable taper sleeve 2 and the lower movable taper sleeve 7 are driven to do vertical linear motion, the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82 extend outwards, the workpiece to be processed is aligned, and finally the locknut 13 is locked;
(3) processing the processed workpiece by a machine tool;
(4) after the processing operation is finished, the locknut 13 is loosened, the screw rod 4 is rotated reversely through the handle 17, the spring 9 and the spring stop pin 10 are arranged between the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82, the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82 are contracted inwards through the spring 9 arranged inside, and a processed piece is loosened and taken out.
Referring to fig. 1 to 5, a first embodiment of the present invention is:
a workpiece centering device suitable for a low-precision cylindrical inner hole comprises a cover plate 1, an upper movable taper sleeve 2, an upper connecting disc 3, a screw rod 4, a middle connecting frame 5, a lower supporting frame 6, a lower movable taper sleeve 7 and a telescopic positioning claw 8;
the cover plate 1 comprises an upper cover plate 111, an inner cover plate 112 and a lower cover plate 113; the upper coupling plate 3, the middle coupling frame 5 and the lower support frame 6 are connected with each other from top to bottom along the vertical direction through bolts 14 and screws 15 to form a cavity;
the upper movable taper sleeve 2, the screw rod 4 and the lower movable taper sleeve 7 are sequentially connected from top to bottom along the vertical direction; the upper part of the upper movable taper sleeve 2 is connected with an upper cover plate 111; the lower part of the upper movable taper sleeve 2 is connected with the inner cover plate 112 to form a clamping groove; the upper end of the screw rod 4 is in a convex shape and is arranged in the clamping groove; the lower end of the lower movable taper sleeve 7 is connected with a lower cover plate 113;
the upper movable taper sleeve 2, the inner cover plate 112, the screw rod 4 and the lower movable taper sleeve 7 are arranged in the cavity; the upper movable taper sleeve 2 is connected with the upper connecting disc 3; the lower movable taper sleeve 7 is connected with the lower support frame 6;
the telescopic positioning claw 8 comprises an upper telescopic positioning claw 81 and a lower telescopic positioning claw 82; the upper telescopic positioning claw 81 is connected with the outer surface of the lower part of the upper movable taper sleeve 2 and is arranged between the upper connecting disc 3 and the upper end of the middle connecting frame 5; the lower telescopic positioning claw 82 is connected with the outer surface of the upper part of the lower movable taper sleeve 7 and is arranged between the lower end of the middle connecting frame 5 and the lower support frame 6; the number of the upper telescopic positioning claws 81 and the number of the lower telescopic positioning claws 82 are three respectively.
The spring 9 and the spring catch pin 10 are disposed between the upper and lower telescopic positioning pawls 81 and 82.
The three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are respectively and uniformly distributed on the circumferential plane, and the three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are arranged in a staggered manner by 30 degrees.
The number of the upper telescopic positioning claws 81 and the number of the lower telescopic positioning claws 82 are only three, the extension of the three upper telescopic positioning claws 81 must be synchronized, and the extension of the three lower telescopic positioning claws 82 must be synchronized.
The three upper telescopic positioning claws 81 and the three lower telescopic positioning claws 82 are not extended in a linked manner.
The upper movable taper sleeve 2 is connected with the upper connecting disc 3 through a key 11, and the lower movable taper sleeve 7 is connected with the lower support frame 6 through a key 11.
And the middle connecting frame 5, the upper connecting disc 3 and the lower supporting frame 6 are respectively provided with a positioning pin 12 after being locked.
The lower end of the lower cover plate 113 is also provided with a locknut 13.
And oil cups 16 are arranged between the upper movable taper sleeve 2 and the upper connecting disc 3, between the lower movable taper sleeve 7 and the lower support frame 6, at the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82.
Referring to fig. 1 to 5, another embodiment of the present invention is:
the invention also provides a wedge internal expansion type centering method, wherein the workpiece centering device suitable for the low-precision cylindrical inner hole is the workpiece centering device suitable for the low-precision cylindrical inner hole, and the method comprises the following steps:
(1) hoisting a workpiece centering device suitable for the inner hole of the low-precision cylinder into a machine tool workbench, aligning and fixing;
(2) a workpiece to be processed is hung into a workpiece centering device suitable for a low-precision cylindrical inner hole, the screw rod 4 is rotated through the handle 17, the upper movable taper sleeve 2 and the lower movable taper sleeve 7 are driven to do vertical linear motion, the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82 extend outwards, the workpiece to be processed is aligned, and finally the locknut 13 is locked;
(3) processing the processed workpiece by a machine tool;
(4) after the processing operation is finished, the locknut 13 is loosened, the screw rod 4 is rotated reversely through the handle 17, the spring 9 and the spring stop pin 10 are arranged between the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82, the upper telescopic positioning claw 81 and the lower telescopic positioning claw 82 are contracted inwards through the spring 9 arranged inside, and a processed piece is loosened and taken out.
In conclusion, the workpiece centering device suitable for the low-precision cylindrical inner hole is simple in structural design and convenient to operate, the screw rod is rotated through the handle, the upper movable taper sleeve and the lower movable taper sleeve are respectively driven to do linear motion in the vertical direction, the three upper telescopic positioning claws and the three lower telescopic positioning claws simultaneously extend outwards or contract inwards through the vertical linear motion of the upper movable taper sleeve and the lower movable taper sleeve, and the central axis of the inner hole of the machined workpiece can be automatically corrected by the upper telescopic positioning claws and the lower telescopic positioning claws by adopting the principle of three-point positioning, so that the inner hole of the machined workpiece is automatically positioned and released. The workpiece centering device applicable to the low-precision cylindrical inner hole expands the application range of the expansion sleeve type positioning device, is applicable to the processing of various processed workpieces with inner hole positioning, and has low precision requirement on the inner hole of the processed workpiece. The spring and the spring stop pin are arranged in the middle of the upper telescopic positioning claw or the lower telescopic positioning claw, and the upper telescopic positioning claw and the lower telescopic positioning claw can extend outwards to lock an inner hole of a processed workpiece or contract inwards to loosen the inner hole of the processed workpiece under the action of the spring and the spring stop pin. The last flexible locating pawl of threely staggers 30 degrees with the lower flexible locating pawl of threely and arranges, when the circularity of by processing the work piece is not good, makes flexible locating pawl can be in a plurality of directions with by the contact of processing work piece hole, can guarantee by the central axis of processing work piece hole can be better with be applicable to the coincidence of the central axis of the work piece centring means of low accuracy cylinder hole. The number of the upper telescopic positioning claws and the number of the lower telescopic positioning claws can be respectively three, the upper telescopic positioning claws extend out synchronously, the lower telescopic positioning claws extend out synchronously, and the three lower telescopic positioning claws extend out synchronously, so that the center line of a processed workpiece can be automatically corrected through the synchronous extension of the three upper telescopic positioning claws or the three lower telescopic positioning claws, and the center line of the workpiece centering device applicable to the low-precision cylindrical inner hole is coincided. The stretching out and drawing back of flexible locating jaw and three lower flexible locating jaw on the three can not the linkage, only stretch out the back that targets in place when three last flexible locating jaw promptly, three lower flexible locating jaw just can continue to outwards stretch out, perhaps stretch out the back that targets in place when three lower flexible locating jaw, three last flexible locating jaw just can continue to outwards stretch out, three last flexible locating jaw and three lower flexible locating jaw do not link and mainly be when guaranteeing to be processed work piece cylindricity not good, guarantee to go up flexible locating jaw and lower flexible locating jaw homoenergetic and by the contact of processing work piece hole. The upper movable taper sleeve and the upper connecting disc as well as the lower movable taper sleeve and the lower support frame are connected through keys, and the keys are mainly used for limiting circumferential fixation between the upper movable taper sleeve and the upper connecting disc and limiting rotation of the upper movable taper sleeve and the lower movable taper sleeve. The middle connecting frame, the upper connecting disc and the lower supporting frame are respectively provided with a positioning pin after being locked, and the positioning pins are mainly used for limiting the rotation freedom degree in the horizontal plane and further locking the middle connecting frame, the upper connecting disc and the lower supporting frame. The lower extreme of apron sets up check bolt down, mainly is in order to play clamping action to the screw rod, prevents in the course of the work that not hard up the condition appears in the screw rod. Finally, when the workpiece centering device suitable for the low-precision cylindrical inner hole is continuously used for five times or six times, a proper amount of clean lubricating oil should be filled into oil cups at moving parts such as the three upper telescopic positioning claws and the three lower telescopic positioning claws, and the service life of the device is prolonged.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. The workpiece centering device is suitable for a low-precision cylindrical inner hole and is characterized by comprising a cover plate, an upper movable taper sleeve, an upper connecting disc, a screw rod, a middle connecting frame, a lower supporting frame, a lower movable taper sleeve and a telescopic positioning claw;
the cover plate comprises an upper cover plate, an inner cover plate and a lower cover plate; the upper coupling plate, the middle coupling frame and the lower support frame are connected with each other through bolts and screws from top to bottom along the vertical direction to form a cavity;
the upper movable taper sleeve, the screw rod and the lower movable taper sleeve are sequentially connected from top to bottom along the vertical direction; the upper part of the upper movable taper sleeve is connected with the upper cover plate; the lower part of the upper movable taper sleeve is connected with the inner cover plate to form a clamping groove; the upper end of the screw rod is in a convex shape and is arranged in the clamping groove; the lower end of the lower movable taper sleeve is connected with the lower cover plate;
the upper movable taper sleeve, the inner cover plate, the screw rod and the lower movable taper sleeve are sleeved in the cavity; the upper movable taper sleeve is connected with the upper connecting disc in a sliding mode along the vertical direction; the lower movable taper sleeve is connected with the lower support frame in a sliding mode along the vertical direction;
the telescopic positioning claw comprises an upper telescopic positioning claw and a lower telescopic positioning claw; the upper telescopic positioning claw is connected with the outer surface of the lower part of the upper movable taper sleeve and is arranged between the upper connecting disc and the upper end of the middle connecting frame; the lower telescopic positioning claw is connected with the outer surface of the upper part of the lower movable taper sleeve and is arranged between the lower end of the middle connecting frame and the lower supporting frame; the number of the upper telescopic positioning claws and the lower telescopic positioning claws is respectively three, three the upper telescopic positioning claws and the lower telescopic positioning claws are respectively and evenly distributed on the circumferential plane at the position, three the upper telescopic positioning claws and the three lower telescopic positioning claws are staggered by 30 degrees and arranged, the three upper telescopic positioning claws simultaneously extend outwards or contract inwards, the three lower telescopic positioning claws simultaneously extend outwards or contract inwards, only when the three upper telescopic positioning claws extend in place, the three lower telescopic positioning claws can continue to extend outwards, or when the three lower telescopic positioning claws extend in place, the three upper telescopic positioning claws can continue to extend outwards.
2. The workpiece centering device for the low-precision cylindrical inner hole as claimed in claim 1, wherein a spring and a spring stop pin are arranged between the upper telescopic positioning claw and the lower telescopic positioning claw.
3. The workpiece centering device for the low-precision cylindrical inner hole as claimed in claim 1, wherein the number of the upper telescopic positioning claws and the number of the lower telescopic positioning claws are respectively only three, the extension of the three upper telescopic positioning claws is synchronized, and the extension of the three lower telescopic positioning claws is synchronized.
4. The workpiece centering device for the inner hole of the cylinder with low precision as claimed in claim 1, wherein the upper movable taper sleeve and the upper coupling disk are connected through a key, and the lower movable taper sleeve and the lower support frame are connected through a key.
5. The workpiece centering device for the inner hole of the cylinder with low precision as claimed in claim 1, wherein a positioning pin is respectively arranged after the middle connecting frame, the upper connecting disc and the lower supporting frame are locked.
6. The workpiece centering device for the low-precision cylindrical inner hole as claimed in claim 1, wherein a locknut is further provided at the lower end of said lower cover plate.
7. The workpiece centering device for the low-precision cylindrical inner hole as claimed in claim 1, wherein oil cups are arranged between the upper movable taper sleeve and the upper coupling plate, between the lower movable taper sleeve and the lower support frame, and at the upper telescopic positioning claw and the lower telescopic positioning claw.
8. A workpiece centering method suitable for a low-precision cylindrical inner hole is characterized by comprising the following steps:
(1) hoisting a workpiece centering device suitable for the inner hole of the low-precision cylinder into a machine tool workbench, aligning and fixing; the workpiece centering device suitable for the inner hole of the low-precision cylinder is the workpiece centering device suitable for the inner hole of the low-precision cylinder in any one of claims 1 to 7;
(2) the method comprises the following steps that a workpiece to be processed is hung into a workpiece centering device suitable for a low-precision cylindrical inner hole, a screw rod is rotated through a handle, an upper movable taper sleeve and a lower movable taper sleeve are driven to do vertical linear motion, an upper telescopic positioning claw and a lower telescopic positioning claw extend outwards, the workpiece to be processed is aligned, and finally a locknut is locked;
(3) processing the processed workpiece by a machine tool;
(4) after the machining operation is finished, the locknut is loosened, the screw rod is reversely rotated through the handle, springs and spring stop pins are arranged in the middle of the upper telescopic positioning claw and the lower telescopic positioning claw, the upper telescopic positioning claw and the lower telescopic positioning claw are enabled to contract inwards through the springs arranged inside, and a machined piece is loosened and taken out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010700363.1A CN111730085B (en) | 2017-11-01 | 2017-11-01 | Workpiece centering device and centering method suitable for low-precision cylindrical inner hole |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010700363.1A CN111730085B (en) | 2017-11-01 | 2017-11-01 | Workpiece centering device and centering method suitable for low-precision cylindrical inner hole |
| CN201711059685.7A CN108031880B (en) | 2017-11-01 | 2017-11-01 | Wedge internal expansion type centering device and centering method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711059685.7A Division CN108031880B (en) | 2017-11-01 | 2017-11-01 | Wedge internal expansion type centering device and centering method |
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| Publication Number | Publication Date |
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| CN111730085A CN111730085A (en) | 2020-10-02 |
| CN111730085B true CN111730085B (en) | 2021-06-15 |
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| CN202010700363.1A Active CN111730085B (en) | 2017-11-01 | 2017-11-01 | Workpiece centering device and centering method suitable for low-precision cylindrical inner hole |
| CN201711059685.7A Active CN108031880B (en) | 2017-11-01 | 2017-11-01 | Wedge internal expansion type centering device and centering method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711059685.7A Active CN108031880B (en) | 2017-11-01 | 2017-11-01 | Wedge internal expansion type centering device and centering method |
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| DE3317828A1 (en) * | 1983-05-17 | 1984-11-22 | Josef 7230 Schramberg Moosmann | Quick-action mandrel for machine tools |
| CN102069207A (en) * | 2011-01-09 | 2011-05-25 | 无锡银联机械有限公司 | Device capable of elastically clamping two ends of long hole |
| CN202539614U (en) * | 2011-12-28 | 2012-11-21 | 包头市佳隆金属制品有限责任公司 | Double-taper sleeve split adjustable turning and grinding mandrel device |
| CN203448698U (en) * | 2013-03-21 | 2014-02-26 | 南京数控机床有限公司 | Novel single draw-bar expanding mandrel device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108031880A (en) | 2018-05-15 |
| CN108031880B (en) | 2020-07-28 |
| CN111730085A (en) | 2020-10-02 |
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