CN113458433A - Clamping tool for processing external thread of large thin-wall cylinder - Google Patents
Clamping tool for processing external thread of large thin-wall cylinder Download PDFInfo
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- CN113458433A CN113458433A CN202110855168.0A CN202110855168A CN113458433A CN 113458433 A CN113458433 A CN 113458433A CN 202110855168 A CN202110855168 A CN 202110855168A CN 113458433 A CN113458433 A CN 113458433A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B25/00—Accessories or auxiliary equipment for turning-machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
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- Mechanical Engineering (AREA)
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Abstract
本发明公开了一种用于大型薄壁圆筒外螺纹加工的夹持工装，包括三爪卡盘一和胀紧夹具，胀紧夹具包括从左到右依次连接的三爪卡盘二、轴承座和连接筒，轴承座中间设有第一通孔，该第一通孔内设有若干个滚动轴承，连接筒一端固定连接有同轴的固定轴，固定轴外侧面与若干个滚动轴承内圈紧固，连接筒套设于车床尾座套筒外侧面上，三爪卡盘一和三爪卡盘二自带的卡爪上均连接有扇形卡板，扇形卡板的外径与工件的内径相匹配。本发明通过在工件两端均采用相同的三爪卡盘和扇形卡板胀紧工件两端内孔，保证了两端同轴度，结构整体刚性好，安装、拆卸工件方便，工作效率高，可有效防止薄壁圆筒在径向夹紧过程中，产生结构变形，防止车削过程受力变形。
The invention discloses a clamping tool for processing large-scale thin-walled cylindrical external threads, which comprises a three-jaw chuck 1 and an expansion clamp. The expansion clamp comprises a three-jaw chuck 2, a bearing seat and The connecting cylinder has a first through hole in the middle of the bearing seat, and several rolling bearings are arranged in the first through hole. One end of the connecting cylinder is fixedly connected with a coaxial fixed shaft, and the outer surface of the fixed shaft is fastened with the inner rings of several rolling bearings. The connecting cylinder is sleeved on the outer surface of the lathe tailstock sleeve. The three-jaw chuck 1 and the three-jaw chuck 2 are equipped with a fan-shaped clamping plate, and the outer diameter of the fan-shaped clamping plate matches the inner diameter of the workpiece. . The invention adopts the same three-jaw chuck and fan-shaped chuck at both ends of the workpiece to expand the inner holes at both ends of the workpiece, so as to ensure the coaxiality of the two ends, the overall rigidity of the structure is good, the installation and removal of the workpiece is convenient, and the work efficiency is high. It can effectively prevent the thin-walled cylinder from structural deformation during the radial clamping process, and prevent the force deformation during the turning process.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a clamping tool for machining external threads of a large thin-wall cylinder.
Background
The outer diameter of the cylinder is 425mm, the inner diameter of the cylinder is 407mm, the length of the cylinder is 460mm, external threads are required to be processed on the outer circle surface of the cylinder, the external threads are generally processed on a lathe, the existing thin-wall cylinder is generally processed in a radial clamping mode that an elastic sleeve is added on the outer circle of a workpiece or a three-jaw chuck clamping mode is adopted for fixing, the technology easily enables the workpiece to generate clamping deformation, the processing size is difficult to accurately control, and the turning process cannot be carried out in serious cases; secondly, the integral shaft type is 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 gypsum, cement, resin sand and the like, the thin-wall cylinder is integrally sleeved on the tool shaft, and then the outer circle turning is carried out, and the processing method has the following defects: many auxiliary materials, the frock preparation degree of difficulty is big, the installation is inconvenient, work efficiency is low, and the processing cost of manufacture is high.
Disclosure of Invention
In order to solve the above background technical problems, the invention provides a clamping tool for processing external threads of a large thin-wall cylinder, wherein the clamping tool adopts the same three-jaw chuck and fan-shaped clamping plates at two ends of a workpiece to expand inner holes at two ends of the workpiece, so that the whole structure has good rigidity, the installation and the disassembly are convenient, the working efficiency is high, the structural deformation of the thin-wall cylinder in the radial clamping process can be effectively prevented, and the forced deformation in the turning process can be prevented.
In order to achieve the purpose, the invention provides the following technical scheme:
a clamping tool for processing external threads of a large thin-walled cylinder comprises a first three-jaw chuck connected with a lathe spindle and is characterized by further comprising a tensioning clamp connected with a lathe tailstock sleeve, wherein the tensioning clamp comprises a second three-jaw chuck, a bearing seat and a connecting cylinder which are sequentially connected from left to right, a flange plate is arranged at the left end of the bearing seat, the outer diameter of the flange plate is consistent with the outer diameter of the three-jaw chuck, the left end face of the flange plate is fixedly connected with the right end face of the second three-jaw chuck, a first through hole is formed in the middle of the bearing seat, a plurality of rolling bearings are arranged in the first through hole, a coaxial fixed shaft is fixedly connected with one end of the connecting cylinder, the outer diameter of the fixed shaft is smaller than that of the connecting cylinder, a blind hole is formed in the other end of the connecting cylinder, the inner diameter of the blind hole is matched with the outer diameter of the lathe tailstock sleeve, the fixed shaft is inserted into a plurality of rolling bearing holes, and the connecting cylinder is sleeved on the outer side face of the lathe tailstock sleeve, a plurality of positioning bolts which are uniformly distributed in the circumferential direction are arranged on the outer side wall of the connecting cylinder, the end heads of the positioning bolts are propped against the outer side surface of the lathe tailstock sleeve, and the connecting cylinder and the lathe tailstock sleeve can be fixedly connected by screwing the positioning bolts;
three-jaw chuck one and two models of three-jaw chuck, specification, size are all unanimous, and three-jaw chuck one and three-jaw chuck two all are connected with fan-shaped cardboard from the jack catch of taking, the external diameter of fan-shaped cardboard matches with the internal diameter of work piece, adjusts the jack catch position from taking on three-jaw chuck one, can expand tightly in work piece left end hole simultaneously with three fan-shaped cardboard on three-jaw chuck one from taking the jack catch, adjusts the jack catch position from taking on three-jaw chuck two, can expand tightly in work piece right-hand member hole simultaneously with three fan-shaped cardboard on three-jaw chuck two from taking the jack catch.
Preferably, fan-shaped cardboard includes sector plate, fagging and strengthening rib, fagging one end fixed connection is on the jack catch lateral surface of three-jaw chuck from the area, the other end and sector plate medial surface middle part fixed connection, the strengthening rib is equipped with two, and this strengthening rib adopts the round steel, one end and sector plate medial surface fixed connection, and one end corresponds side fixed connection with the fagging, and the relative fagging center line symmetry setting of two strengthening ribs.
Preferably, the height of the sector plate is set to be 40-50 mm, and a plurality of arc grooves which are parallel to the outer arc line and are uniformly distributed are arranged on the outer arc surface.
Preferably, the rolling bearing is provided with 4 rolling bearings, the 4 rolling bearings respectively adopt 1 conical roller bearing, 2 deep groove ball bearings and 1 plane bearing from right to left, and a space ring is arranged in the middle of the 2 deep groove ball bearings.
Preferably, first through-hole right-hand member portion is equipped with the internal thread, and this internal thread hole bottom hole is greater than first through-hole aperture, the downthehole thread bush that is equipped with of internal thread is equipped with the external screw thread with internal thread matched with on the excircle face of this thread bush, the thread bush cover is located the fixed axle outside, with internal thread hole threaded connection, is equipped with two second through-holes that are centrosymmetric setting on this thread bush terminal surface, and this second through-hole is used for rotatory thread bush, adjusts the thread bush position, prevents that inside antifriction bearing from producing the drunkenness.
Preferably, a bearing end cover is arranged on the right end face of the bearing seat and fixedly connected with the bearing seat through a plurality of bolts. The bearing end cover is used for preventing the inner rolling bearing from generating play.
Preferably, the positioning bolt is provided in three pieces.
Preferably, the first three-jaw chuck and the second three-jaw chuck both adopt pneumatic three-jaw chucks.
Compared with the prior art, the invention has the beneficial effects that: 1) the inner holes at two ends of the workpiece are expanded tightly by adopting the same three-jaw chuck and the same fan-shaped clamping plates at two ends of the workpiece, the three-jaw chuck at one end is fixedly connected with a main shaft of a machine tool, and the three-jaw chuck at one end is fixedly connected with a tail seat of the machine tool in a sleeved mode, so that the coaxiality of the two ends is ensured, the integral rigidity of the structure is good, the workpiece is convenient to mount and dismount, the working efficiency is high, the structural deformation of the thin-wall cylinder in the radial clamping process can be effectively prevented, and the stress deformation in the turning process is prevented; 2) the outer arc surface of the fan-shaped clamping plate is provided with a plurality of arc grooves, so that the friction force between the fan-shaped clamping plate and the inner wall of the cylinder can be increased, and the fan-shaped clamping plate and the cylinder are prevented from relatively rotating in the turning process to influence the turning precision; 3) a plurality of rolling bearings are arranged in the bearing seat, so that the three-jaw chuck at the tail seat end of the machine tool can synchronously rotate with the three-jaw chuck at the machine tool end, and the turning precision is improved; 4) simple structure, convenient manufacture and low processing cost.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a three-jaw chuck and a fan-shaped chuck plate according to an embodiment of the present invention;
FIG. 3 is a schematic view of a threaded sleeve according to an embodiment of the present invention;
FIG. 4 is a schematic view of an installation structure of a connecting cylinder and a tailstock sleeve according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of an arc groove on an outer arc surface of a sector plate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: 1. the clamping device comprises a fan-shaped clamping plate, 101, a fan-shaped plate, 1011, an arc groove, 102, a supporting plate, 103, a reinforcing rib, 2, a first three-jaw chuck, 201, a jaw of the first three-jaw chuck, 2 ', a second three-jaw chuck, 201', a jaw of the second three-jaw chuck, 3, a bearing seat, 301, a flange plate, 4a, a tapered roller bearing, 4b, a deep groove ball bearing, 4c, a plane bearing, 5, a threaded sleeve, 501, a second through hole, 6, a connecting cylinder, 601, a fixed shaft, 602, a blind hole, 7, a positioning bolt, 8, a spacer ring, 9, a bearing end cover, 10, a bolt, 11 and a machine tool tailstock sleeve.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 to 5, an embodiment of the present invention includes a first three-jaw chuck 2 connected to a lathe spindle, and an expansion fixture connected to a lathe tailstock sleeve, where the expansion fixture includes a second three-jaw chuck 2 ', a bearing seat 3, and a connecting cylinder 6, which are sequentially connected from left to right, a flange 301 is disposed at a left end of the bearing seat 3, an outer diameter of the flange 301 is identical to an outer diameter of the second three-jaw chuck 2 ', a left end surface of the flange 301 is fixedly connected to a right end surface of the second three-jaw chuck 2 ', a first through hole is disposed in the middle of the bearing seat 3, 4 rolling bearings are disposed in the first through hole, and the 4 rolling bearings are respectively set from right to left: 1 tapered roller bearing 4a, 2 deep groove ball bearings 4b and 1 plane bearing 4c, a space ring 8 is arranged in the middle of the 2 deep groove ball bearings 4b, one end of a connecting cylinder 6 is fixedly connected with a coaxial fixed shaft 601, the outer diameter of the fixed shaft 601 is smaller than that of the connecting cylinder 6, the other end of the connecting cylinder 6 is provided with a blind hole 602, the inner diameter of the blind hole 602 is matched with the outer diameter of a lathe tailstock sleeve 11 (the lathe tailstock sleeve is generally used for installing a top on a lathe tailstock and is convenient for the two ends of a workpiece to be propped for turning), a fixed shaft 601 is inserted into 4 rolling bearing inner holes, a connecting cylinder 6 is sleeved on the outer side surface of the lathe tailstock sleeve 11, 3 positioning bolts 7 which are uniformly distributed on the circumference are arranged on the outer side wall of the connecting cylinder 6, the end of the positioning bolt 7 is propped against the outer side surface of the lathe tailstock sleeve 11, and the connecting cylinder 6 can be fixedly connected with the lathe tailstock sleeve 11 by screwing the positioning bolt 7;
the right-hand member portion of first through-hole is equipped with the internal thread, and this internal thread hole bottom hole is greater than first through-hole aperture, and the internal thread is downthehole to be equipped with thread bush 5, be equipped with on 5 outer planes of this thread bush with internal thread matched with external screw thread, the fixed axle 601 outside is located to 5 covers of thread bush, with internal thread hole threaded connection, be equipped with two second through-holes 501 that are central symmetry and set up on 5 terminal surfaces of this thread bush, this second through-hole 501 is used for rotatory thread bush 5, adjusts its position, prevents that inside antifriction bearing from producing the drunkenness.
The types, specifications and sizes of the first three-jaw chuck 2 and the second three-jaw chuck 2 ' are consistent, the jaws 201 of the first three-jaw chuck 2 and the jaws 201 ' of the second three-jaw chuck 2 are connected with fan-shaped clamping plates 1, each fan-shaped clamping plate 1 comprises a fan-shaped plate 101, a supporting plate 102 and reinforcing ribs 103, one end of each supporting plate 102 is fixedly connected to the outer side face of each jaw 201 of the first three-jaw chuck 2 or fixedly connected to the outer side face of each jaw 201 ' of the second three-jaw chuck 2, the other end of each supporting plate is fixedly connected with the middle part of the inner side face of the corresponding fan-shaped plate 101, the reinforcing ribs 103 are two pieces, each reinforcing rib 103 is made of round steel, one end of each reinforcing rib is fixedly connected with the inner side face of the corresponding fan-shaped plate 101, one end of each reinforcing rib is fixedly connected with the corresponding side face of the corresponding to the corresponding supporting plate 102, and the two reinforcing ribs 103 are symmetrically arranged relative to the center line of the supporting plate 102;
the outer diameter of the fan-shaped clamping plate 1 is matched with the inner diameter of a workpiece, the positions of three self-contained clamping jaws 201 on the three-jaw chuck I2 are adjusted, and the fan-shaped clamping plate 1 on the three clamping jaws 201 can be simultaneously expanded to an inner hole at the left end of the workpiece; the positions of three self-contained clamping jaws 201 ' on the three-jaw chuck II 2 ' are adjusted, and the fan-shaped clamping plates 1 on the three clamping jaws 201 ' can be simultaneously expanded in the inner hole at the right end of the workpiece.
The height H of the sector plate 101 is set to be 40mm, 7 arc grooves 1011 which are parallel to the outer arc line and are uniformly distributed are arranged on the outer arc surface, and the arrangement of the 7 arc grooves 1011 can improve the friction force between the outer arc surface of the sector plate 101 and the inner hole of a workpiece, so that the sector clamping plate 1 and the cylinder are prevented from relatively rotating in the turning process, and the turning precision is prevented from being influenced.
Preferably, the first three-jaw chuck 2 and the second three-jaw chuck 2' both adopt pneumatic three-jaw chucks.
As shown in fig. 6, the second embodiment of the present invention includes a first three-jaw chuck 2 connected to a lathe spindle, and an expansion fixture connected to a lathe tailstock sleeve, where the expansion fixture includes a second three-jaw chuck 2 ', a bearing seat 3, and a connecting cylinder 6, which are sequentially connected from left to right, the left end of the bearing seat 3 is provided with a flange 301, an outer diameter of the flange 301 is identical to an outer diameter of the second three-jaw chuck 2 ', a left end surface of the flange 301 is fixedly connected to a right end surface of the second three-jaw chuck 2 ', a first through hole is provided in the middle of the bearing seat 3, and 4 rolling bearings are provided in the first through hole, and the 4 rolling bearings are respectively set from right to left: 1 tapered roller bearing 4a, 2 deep groove ball bearings 4b and 1 plane bearing 4c, a space ring 8 is arranged in the middle of 2 deep groove ball bearings 4b, one end of a connecting cylinder 6 is fixedly connected with a coaxial fixed shaft 601, the outer diameter of the fixed shaft 601 is smaller than that of the connecting cylinder 6, the other end of the connecting cylinder 6 is provided with a blind hole 602, the inner diameter of the blind hole 602 is matched with the outer diameter of a lathe tailstock sleeve 11 (the lathe tailstock sleeve is generally used for a lathe tailstock installation tip and is convenient for the two ends of a workpiece to be supported and turned), the fixed shaft 601 is inserted into 4 rolling bearing inner holes, a bearing end cover 9 is arranged on the right end face of the bearing seat 3, the bearing end cover 9 is fixedly connected with the bearing seat 3 through 4 bolts 10 which are uniformly distributed on the circumference, the bearing end cover 9 is used for preventing the inner rolling bearing from generating play, the connecting cylinder 6 is sleeved on the outer side face of the lathe tailstock sleeve 11, 3 positioning bolts 7 which are uniformly distributed on the outer side wall of the connecting cylinder 6, the end of the positioning bolt 7 is propped against the outer side surface of the lathe tailstock sleeve 11, and the connecting cylinder 6 can be fixedly connected with the lathe tailstock sleeve 11 by screwing the positioning bolt 7;
the types, specifications and sizes of the first three-jaw chuck 2 and the second three-jaw chuck 2 ' are consistent, the jaws 201 of the first three-jaw chuck 2 and the jaws 201 ' of the second three-jaw chuck 2 are connected with fan-shaped clamping plates 1, each fan-shaped clamping plate 1 comprises a fan-shaped plate 101, a supporting plate 102 and reinforcing ribs 103, each supporting plate 102 is fixedly connected to the outer side face of each jaw 201 of the first three-jaw chuck 2 or fixedly connected to the outer side face of each jaw 201 ' of the second three-jaw chuck 2, one end of each reinforcing rib is fixedly connected with the middle part of the inner side face of each fan-shaped plate 101, each reinforcing rib 103 is provided with two parts, each reinforcing rib 103 is made of round steel, one end of each reinforcing rib is fixedly connected with the inner side face of each fan-shaped plate 101, one end of each reinforcing rib is fixedly connected with the corresponding side face of each supporting plate 102, and the two reinforcing ribs 103 are symmetrically arranged relative to the center line of each supporting plate 102;
the outer diameter of the fan-shaped clamping plate 1 is matched with the inner diameter of a workpiece, the positions of three self-contained clamping jaws 201 on the three-jaw chuck I2 are adjusted, and the fan-shaped plates 101 on the three clamping jaws 201 can be simultaneously expanded to inner holes at the left end of the workpiece; the positions of three self-contained clamping jaws 201 ' on the three-jaw chuck II 2 ' are adjusted, so that the sector plates 101 on the three clamping jaws 201 ' can be simultaneously expanded in the inner hole at the right end of the workpiece.
The height H of the sector plate 101 is set to be 40mm, and 7 arc grooves 1011 which are parallel to the outer arc line and are uniformly distributed are arranged on the outer arc surface. The arrangement of the 7 arc grooves 1011 can improve the friction force between the outer arc surface of the sector plate 101 and the inner hole of the workpiece, and prevent the sector clamping plate 1 and the cylinder from rotating relatively in the turning process to influence the turning precision.
Preferably, the first three-jaw chuck 2 and the second three-jaw chuck 2' both adopt pneumatic three-jaw chucks.
The working principle of the embodiment of the invention is as follows: fixedly connecting a connecting cylinder of an expansion clamp with a lathe tailstock sleeve, adjusting the positions of three clamping jaws 201 of a three-jaw chuck I2 and three clamping jaws 201 ' of a three-jaw chuck II 2 ' to enable the outer diameters of the outer circular arc surfaces of three sector plates 101 at two ends to be smaller than the inner holes of a workpiece, sleeving the left end of the workpiece on the outer circular arc surfaces of the three sector plates 101 connected with the three clamping jaws 201, sleeving the right end of the workpiece on the outer circular arc surfaces of the three sector plates 101 connected with the three clamping jaws 201 ', adjusting the positions of the three clamping jaws 201 and the three clamping jaws 201 ' after correction to enable the outer circular arc surfaces of the three sector plates 101 at two ends to be respectively attached to the inner side surfaces of the inner holes at two ends of the workpiece, correcting again to enable two ends of the workpiece to be coaxial, then adjusting the positions of the three clamping jaws 201 and the three clamping jaws 201 ' again to enable the outer circular arc surfaces of the three sector plates 101 at two ends to respectively expand the left end and the inner hole of the workpiece, processing external threads on the outer circular surface of the workpiece by a machine tool, feeding seven times, and finishing the slow processing.
According to the embodiment of the invention, the inner holes at two ends of the workpiece are expanded by adopting the same three-jaw chuck and the same fan-shaped clamping plate 1 at two ends of the workpiece, the three-jaw chuck at one end is fixedly connected with the main shaft of the machine tool, and the three-jaw chuck at one end is fixedly connected with the tail seat sleeve of the machine tool, so that the coaxiality of two ends is ensured, the integral rigidity of the structure is good, the installation and the disassembly are convenient, the working efficiency is high, the structural deformation of the thin-wall cylinder in the radial clamping process can be effectively prevented, and the forced deformation in the turning process is prevented.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110855168.0A CN113458433A (en) | 2021-07-28 | 2021-07-28 | Clamping tool for processing external thread of large thin-wall cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110855168.0A CN113458433A (en) | 2021-07-28 | 2021-07-28 | Clamping tool for processing external thread of large thin-wall cylinder |
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| CN113458433A true CN113458433A (en) | 2021-10-01 |
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| CN202110855168.0A Pending CN113458433A (en) | 2021-07-28 | 2021-07-28 | Clamping tool for processing external thread of large thin-wall cylinder |
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Application publication date: 20211001 |