CN109822123B - Clamping method, clamp and machining device for turning thin-wall cylindrical part - Google Patents

Clamping method, clamp and machining device for turning thin-wall cylindrical part Download PDF

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Publication number
CN109822123B
CN109822123B CN201910309927.6A CN201910309927A CN109822123B CN 109822123 B CN109822123 B CN 109822123B CN 201910309927 A CN201910309927 A CN 201910309927A CN 109822123 B CN109822123 B CN 109822123B
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China
Prior art keywords
supporting
thin
cylindrical
shaft
turning
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CN201910309927.6A
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Chinese (zh)
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CN109822123A (en
Inventor
宋清华
王小娟
巫永琳
刘战强
陈龙
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Shandong University
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Shandong University
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Priority to CN201811488110.1A priority Critical patent/CN109382532A/en
Priority to CN2018114881101 priority
Application filed by Shandong University filed Critical Shandong University
Publication of CN109822123A publication Critical patent/CN109822123A/en
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Publication of CN109822123B publication Critical patent/CN109822123B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/40Expansion mandrels
    • B23B31/404Gripping the work or tool by jaws moving radially controlled by conical surfaces

Abstract

The invention relates to a clamping method, a clamp and a processing device for turning a thin-wall cylindrical part, which comprise a first supporting shaft and a second supporting shaft, wherein one end of the first supporting shaft and one end of the second supporting shaft are used for being connected with a tensioning mechanism, the tensioning mechanism is used for applying internal supporting force to two ends of the thin-wall cylindrical part, the tensioning mechanism is provided with a limiting structure, and the limiting structure is used for limiting the axial movement of the thin-wall cylindrical part.

Description

Clamping method, clamp and machining device for turning thin-wall cylindrical part
Technical Field
The invention relates to the technical field of turning, in particular to a clamping method, a clamp and a processing device for turning a thin-wall cylindrical part.
Background
The existing processing method and tool for the thin-wall cylindrical part mainly comprise the following steps: firstly, the most common radial clamping method of attaching an elastic sleeve on the excircle of a workpiece or fixing the workpiece by a three-jaw chuck clamping method is adopted, the technology is easy to cause the workpiece to generate clamping deformation, the precision is reduced, and the production efficiency is low; and secondly, the shaft is integrally fixed, a workpiece is sleeved on the shaft, two ends of the workpiece are fixed, the middle of the workpiece is filled with media such as rubber and paraffin, and the media are melted and unevenly filled due to heat generated in the processing engineering, so that the workpiece is easy to vibrate. The integral solid shaft type ensures that the main shaft of the machine tool bears larger load and reduces the processing precision; and thirdly, the flange disc type fixture tool utilizes a flange disc, a sleeve, a mandrel and a jacking driving structure, and the processing method has complex fixture design and increases the processing cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a clamping method for turning a thin-wall cylindrical part, so that the precision problem caused by workpiece deformation and vibration caused by the conventional clamping mode of the thin-wall cylindrical part is avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a clamping method for turning a thin-wall cylindrical part is characterized in that clamping force along the axial direction of the thin-wall cylindrical part is applied to two ends of the thin-wall cylindrical part to limit the axial movement of the thin-wall cylindrical part, internal supporting force which is uniformly applied to the inner side surface of the thin-wall cylindrical part and faces the outer side of the thin-wall cylindrical part along the radial direction of the thin-wall cylindrical part is applied to the two ends of the thin-wall cylindrical part, and the thin-wall cylindrical part is clamped by the internal supporting force applied to the two ends of the thin-wall cylindrical.
The invention also discloses a clamp for turning the thin-wall cylindrical part, which comprises a first supporting shaft and a second supporting shaft, wherein one end of the first supporting shaft and one end of the second supporting shaft are used for being connected with a tightening mechanism, the tightening mechanism is used for applying internal supporting force to two ends of the thin-wall cylindrical part, the tightening mechanism is provided with a limiting structure, and the limiting structure is used for limiting the axial movement of the thin-wall cylindrical part.
Furthermore, one end of the first supporting shaft and one end of the second supporting shaft, which are used for being connected with the supporting mechanism, are provided with conical structures, the outer surfaces of the conical structures are provided with first threaded structures, and the other end of the second supporting shaft is provided with a tip hole.
Furthermore, prop tight mechanism and include a plurality of interior spares piece, interior spares piece including fixed connection's interior stubble and interior stubble, interior stubble bottom terminal surface and interior stubble fixed connection, the top terminal surface be with the inclined plane that the circular cone type structure wants to match, processing has the second helicitic texture with first helicitic texture assorted on the inclined plane.
Furthermore, the inner support short beams are arc-shaped plates, and the plurality of inner support short beams can be spliced end to form a cylindrical structure matched with the thin-wall cylindrical part.
Furthermore, the first thread structure and the second thread structure both adopt triangular fine-tooth thread structures, and the self-locking performance is good.
Furthermore, the limiting structure is a boss arranged at the end part of the inner support short beam, and the boss can be in contact with the end face of the thin-wall cylindrical part.
Furthermore, the end face of the inner support short beam opposite to the end face of the inner support tooth block is a smooth arc face and is used for contacting with the inner surface of the thin-wall cylindrical part to prevent the inner surface of the thin-wall cylindrical part from being damaged.
The invention also discloses a processing device for turning the thin-wall cylindrical part, which comprises the clamp for turning the thin-wall cylindrical part and a turning machine tool, wherein the first support shaft is used for being connected with a workpiece rotation driving mechanism of the turning machine tool, and the second support shaft is used for being connected with a machine tool tailstock of the turning machine tool.
The invention also discloses a use method of the clamp for turning the thin-wall cylindrical part, which comprises the following steps: the method comprises the following steps:
step 1: the supporting mechanisms are placed on the inner sides of two ends of the thin-wall cylindrical part, the limiting structures are abutted to the end face of the thin-wall cylindrical part, the first supporting shaft and the second supporting shaft are respectively in threaded connection with the supporting mechanisms at the two ends of the thin-wall cylindrical part, the first supporting shaft and the second supporting shaft are screwed in, and the first supporting shaft and the second supporting shaft drive the supporting mechanisms to apply internal supporting force to the thin-wall cylindrical part until the supporting mechanisms are tightly combined with the thin-wall cylindrical part.
Step 2: and fixedly connecting the first support shaft with a workpiece rotation driving mechanism of the turning machine tool, and tightly pushing a machine tool tailstock of the turning machine tool against the second support shaft.
The invention has the beneficial effects that:
1. according to the clamping method for turning the thin-wall cylindrical part, the symmetrical internal supporting force is applied to the two sides of the workpiece, so that the interiors of the two ends of the workpiece are symmetrically supported, medium filling is not used, and the precision problem caused by flutter due to clamping deformation, cutting force and medium melting and uneven filling caused by cutting heat of the workpiece in the conventional machining process is solved.
2. The clamp disclosed by the invention is simple in structure and low in manufacturing cost, symmetrical internal supporting force is applied to a workpiece by adopting the first supporting shaft, the second supporting shaft and the plurality of internal supporting pieces, the weight of the clamp is light, and the load borne by the main shaft of the workpiece rotation driving mechanism of the turning machine tool is low.
3. According to the clamp, the inner supporting piece is in threaded connection with the triangular fine-tooth thread structures on the conical structures of the first supporting shaft and the second supporting shaft through the triangular fine-tooth thread structures on the inclined surfaces, the self-locking performance is good, the diameter of a cylinder structure formed by the inner supporting short beams of the inner supporting piece can be increased by screwing the first supporting shaft and the second supporting shaft into the cylinder structure, the clamping requirements of workpieces with different sizes in a certain diameter range are met, and the clamp is flexible to use.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the clamping method of the present invention;
FIG. 2 is a schematic view taken along line A in FIG. 1;
FIG. 3 is a schematic view of a first supporting shaft according to the present invention;
FIG. 4 is a schematic view of the inner support member of the present invention;
FIG. 5 is a schematic view of the assembled state of the inner support member according to the present invention;
FIG. 6 is a schematic view of the assembly of the clamp of the present invention with a thin-walled cylindrical member;
the supporting device comprises a first supporting shaft 1, a conical structure 1-1, a second supporting shaft 2, a tip hole 2-1, an inner supporting piece 3, an inner supporting short beam 3-1, an inner supporting tooth block 3-2, an inclined plane 3-2-1, a boss 4 and a thin-wall cylindrical piece 5.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the existing clamping method for turning the thin-wall cylindrical part is easy to generate clamping deformation and vibration, so that the machining precision is low.
A clamping method for turning a thin-wall cylindrical part is characterized in that clamping force along the axial direction of the thin-wall cylindrical part is applied to two ends of the thin-wall cylindrical part to limit the axial movement of the thin-wall cylindrical part, internal supporting force which is uniformly applied to the inner side surface of the thin-wall cylindrical part and faces the outer side of the thin-wall cylindrical part along the radial direction of the thin-wall cylindrical part is applied to the two ends of the thin-wall cylindrical part, and the thin-wall cylindrical part is clamped by the internal supporting force applied to the two ends of the thin-wall cylindrical.
By adopting the clamping method, the thin-wall cylindrical part is not required to be filled with media such as rubber, paraffin and the like, so that the problem of workpiece vibration caused by medium melting and uneven filling due to cutting force and cutting heat is solved, the problem of workpiece deformation caused by the traditional radial clamping or three-jaw chuck clamping by adopting the internal supporting force applied to the two ends of the workpiece is solved, and the machining precision is improved.
The invention further discloses a clamp matched with the clamping method for turning the thin-wall cylindrical part, and in a typical embodiment of the application, the clamp comprises a first support shaft 1 and a second support shaft 2 which are made of No. 45 steel, when the clamp is used, the first support shaft and the second support shaft are positioned on two sides of the thin-wall cylindrical part, one end part of the first support shaft and one end part of the second support shaft can be connected with a supporting mechanism, the first support shaft and the second support shaft can apply internal supporting force to the inner side surface of the end part of the thin-wall cylindrical part through the supporting mechanism, the supporting mechanism is further provided with a limiting structure, and the limiting structure is used for being tightly contacted with the end surface of the thin-wall cylindrical part so as to prevent the thin-wall cylindrical part from moving axially in the machining process.
The end part of one side of the first support shaft and the end part of one side of the second support shaft, which are used for connecting the supporting mechanism, are provided with a conical structure 1-1, the outer circumferential surface of the conical structure is provided with a first thread structure, the first thread structure adopts a triangular fine-tooth thread structure, the center of the end part of the other side of the second support shaft 2 is provided with a center hole 2-1, the center hole is processed by drilling and grinding to achieve the required precision and is used for connecting with a turning machine tailstock, and the turning machine tailstock can apply a supporting force to the second support shaft through the center hole.
The tightening mechanism comprises three inner supporting pieces 3 with the same shape, the inner supporting pieces are made of No. 45 steel, each inner supporting piece comprises an inner supporting short beam 3-1 and an inner supporting tooth block 3-2 which are fixedly welded, each inner supporting short beam is an arc-shaped plate, the radian of each arc-shaped plate is 120 degrees, the three arc-shaped plates are mutually spliced end to form a cylindrical structure matched with the shape of a thin-wall cylindrical piece to be processed, the bottom end face of each inner supporting tooth block is welded on each arc-shaped plate, each inner supporting tooth block is welded in the middle of the end face of one side of the circle center of each arc-shaped plate, the top end face of each inner supporting tooth block is an inclined face 3-2-1 matched with a conical structure of a first supporting shaft or a second supporting shaft, a second thread structure matched with the first thread structure is arranged on each inclined face, each second thread structure is of a triangular fine thread structure, and each of the first thread structure and the second thread structure is of a triangular fine, the self-locking performance is good, the end face of the side opposite to the side where the circle center of the arc-shaped plate is located is used for being in contact with the inner side face of the thin-wall cylindrical part, the surface is polished to form a smooth arc face, the roughness is low, and the damage to the inner surface of the thin-wall cylindrical part is small.
The limiting structure adopts the boss 4 fixed at the end part of the inner supporting short beam, the boss and the inner supporting short beam are vertically arranged to form an L-shaped structure, and when the limiting structure is used, one side end face of the boss can be in contact with the end face of the thin-wall cylindrical part, so that the axial movement of the thin-wall cylindrical part in the machining process is limited, and the parallelism of the inner supporting part and the thin-wall cylindrical part is ensured.
The invention also discloses a turning device for the thin-wall cylindrical part, which comprises the clamp and the turning machine tool, wherein the turning machine tool only needs to adopt the existing turning machine tool, the first support shaft is used for being connected with a main shaft of a workpiece rotation driving mechanism of the turning machine tool, the second support shaft is used for being connected with a machine tool tailstock of the turning machine tool, and the machine tool tailstock can tightly push the second support shaft.
The invention also discloses a use method of the clamp for turning the thin-wall cylindrical part, which comprises the following steps:
step 1: three inner supporting pieces are placed in one end of a thin-wall cylindrical piece 5, inner supporting short beams of the inner supporting pieces are in contact with the end face of the inner side of the thin-wall cylindrical piece through the arc end face of the opposite side of the circle center of an arc-shaped plate, bosses arranged on the inner supporting short beams are in contact with the end face of the thin-wall cylindrical piece, the positions of the three inner supporting pieces are manually adjusted to enable the three inner supporting pieces to be uniformly distributed along the circumferential direction of the thin-wall cylindrical piece, a conical structure at the end part of a first supporting shaft is in threaded connection with three inner supporting tooth blocks, the first supporting shaft is rotated to enable the first supporting shaft to move towards the inner direction of the thin-wall cylindrical piece along the axis of the thin-wall cylindrical piece, the movement of the first supporting shaft can drive the three inner supporting tooth blocks to move towards the outer direction of the thin-wall cylindrical piece along the radial direction of the thin-wall cylindrical piece due to the threaded connection of the first supporting shaft and the inner supporting tooth blocks, the inner supporting pieces and the thin-wall cylindrical piece can not rotate relatively, and the three inner supporting pieces and the second supporting shaft are arranged at the other side end of the thin-wall cylindrical piece by the same method.
Step 2: the first support shaft is fixedly connected with a main shaft of a workpiece rotation driving mechanism of the turning machine tool, a machine tool tailstock of the turning machine tool is operated, and the machine tool tailstock is pressed against the second support shaft through a center hole in the second support shaft, so that the limitation of the axial movement of the thin-wall cylindrical part is realized.
The clamp has the advantages of simple structure, convenience in machining and light weight, reduces the load of the main shaft of the turning machine tool, does not generate clamping deformation of the thin-wall cylindrical part by applying internal supporting force to the two ends of the thin-wall cylindrical part, does not need to be filled with media such as rubber and paraffin in the whole clamping process, avoids the vibration phenomenon caused by melting of the media or uneven filling of the media due to heat generated in the machining process, and improves the machining precision.
The clamp is suitable for clamping a thin-wall cylindrical workpiece with a cylindrical structure formed by the arc-shaped plate and the diameter approximately equal to that of the thin-wall cylindrical workpiece, the screwing depths of the first supporting shaft and the second supporting shaft are different, the clamp can meet the clamping requirements of thin-wall cylindrical workpieces with different diameters within a certain diameter range, and the applicability of the clamp is improved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (5)

1. The clamp for turning the thin-wall cylindrical part is characterized by comprising a first supporting shaft and a second supporting shaft, wherein one end of the first supporting shaft and one end of the second supporting shaft are used for being connected with a tightening mechanism, the tightening mechanism is used for applying internal supporting force to two ends of the thin-wall cylindrical part, a limiting structure is arranged on the tightening mechanism, and the limiting structure is used for limiting the axial movement of the thin-wall cylindrical part;
one end of the first support shaft and one end of the second support shaft, which are used for connecting the supporting mechanism, are provided with conical structures, the outer surfaces of the conical structures are provided with first thread structures, and the other end of the second support shaft is provided with a tip hole;
the tightening mechanism comprises a plurality of inner supporting pieces, each inner supporting piece comprises an inner supporting short beam and an inner supporting tooth block which are fixedly connected, the bottom end face of each inner supporting tooth block is fixedly connected with the corresponding inner supporting short beam, the top end face of each inner supporting tooth block is an inclined face matched with the corresponding conical structure, and a second threaded structure matched with the first threaded structure is machined on each inclined face;
the inner supporting short beams are arc-shaped plates, and a plurality of inner supporting short beams can be spliced end to form a cylindrical structure matched with the thin-wall cylindrical part; the end face of the inner support short beam, which is opposite to the end face of the inner support tooth block, is a smooth cambered surface and is used for contacting with the inner surface of the thin-wall cylindrical part.
2. The clamp for turning a thin-walled cylindrical workpiece according to claim 1, wherein the first thread structure and the second thread structure are triangular fine-pitch thread structures.
3. The clamp for turning the thin-walled cylindrical workpiece as claimed in claim 1, wherein the limiting structure is a boss arranged at the end part of the inner supporting short beam.
4. A thin-walled cylindrical member turning machining apparatus comprising the thin-walled cylindrical member turning jig according to any one of claims 1 to 3 and a turning machine, wherein the first support shaft is connected to a workpiece rotation driving mechanism of the turning machine, and the second support shaft is connected to a machine tailstock of the turning machine.
5. The use method of the clamp for turning the thin-walled cylinder part as claimed in any one of claims 1 to 3, is characterized by comprising the following steps:
step 1: the supporting mechanisms are placed on the inner sides of two ends of the thin-wall cylindrical part, the limiting structures are abutted against the end face of the thin-wall cylindrical part, the first supporting shaft and the second supporting shaft are respectively in threaded connection with the supporting mechanisms at two ends of the thin-wall cylindrical part, the first supporting shaft and the second supporting shaft are screwed in, and the first supporting shaft and the second supporting shaft drive the supporting mechanisms to apply internal supporting force to the thin-wall cylindrical part until the supporting mechanisms are tightly combined with the thin-wall cylindrical part;
step 2: and fixedly connecting the first support shaft with a workpiece rotation driving mechanism of the turning machine tool, and tightly pushing a machine tool tailstock of the turning machine tool against the second support shaft.
CN201910309927.6A 2018-12-06 2019-04-17 Clamping method, clamp and machining device for turning thin-wall cylindrical part Active CN109822123B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201811488110.1A CN109382532A (en) 2018-12-06 2018-12-06 A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant)
CN2018114881101 2018-12-06

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CN109822123B true CN109822123B (en) 2020-10-02

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CN201910309927.6A Active CN109822123B (en) 2018-12-06 2019-04-17 Clamping method, clamp and machining device for turning thin-wall cylindrical part

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111112954B (en) * 2020-01-03 2021-07-27 中国船舶重工集团公司第七0七研究所 Finish machining process method for inner cavity of floating drum of liquid floated gyroscope
CN111195736B (en) * 2020-01-19 2021-05-04 重庆众联齿轮传动有限公司 Ring sleeve type part clamping and positioning device and ring sleeve type part machining method
CN111230164B (en) * 2020-02-03 2021-04-20 大连理工大学 Clamping method of automatic inner supporting clamp for thin-wall cylindrical part

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DE20314255U1 (en) * 2003-09-13 2003-11-06 Isad Electronic Sys Gmbh & Co Rapid clamping chuck for spinning thin workpieces has a threaded fastener with two interacting tapering thrust sleeves to grip the inside of the mounting aperture of the workpiece
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CN103737048A (en) * 2013-12-27 2014-04-23 滨州盟威斯林格缸套有限公司 Clamp special for thin wall cylinder excircle turning
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CN108480672A (en) * 2018-06-06 2018-09-04 福州大学 For the special fixture and its working method of slim cylindrical element turnery processing

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Publication number Priority date Publication date Assignee Title
EP1145789A1 (en) * 2000-04-10 2001-10-17 E.C.S.- Engineering Carbide Systems Machine tool feed clamp
DE20314255U1 (en) * 2003-09-13 2003-11-06 Isad Electronic Sys Gmbh & Co Rapid clamping chuck for spinning thin workpieces has a threaded fastener with two interacting tapering thrust sleeves to grip the inside of the mounting aperture of the workpiece
CN201783844U (en) * 2010-07-28 2011-04-06 中国石油天然气集团公司 Combined fixture for fast turning outer diameters of thin-walled long pipe workpieces
CN203830761U (en) * 2013-04-08 2014-09-17 浙江同泰泵业有限公司 Inner expansion type positioning fixture
CN103737048A (en) * 2013-12-27 2014-04-23 滨州盟威斯林格缸套有限公司 Clamp special for thin wall cylinder excircle turning
CN206779497U (en) * 2017-06-09 2017-12-22 江西江铃底盘股份有限公司 A kind of blank materials in the tube cylindrical turning device
CN108480672A (en) * 2018-06-06 2018-09-04 福州大学 For the special fixture and its working method of slim cylindrical element turnery processing

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