CN-117066547-B - Self-centering clamping device and clamping method for numerical control turntable of high-precision annular workpiece

CN117066547BCN 117066547 BCN117066547 BCN 117066547BCN-117066547-B

Abstract

The invention relates to the technical field of clamping devices, in particular to a high-precision circular workpiece numerical control turntable self-centering clamping device and a clamping method thereof; through setting up the support disc that connects in the revolving stage body, make the revolving stage body drive the support disc and rotate, and provide the support when rotating the support disc through rolling supporting mechanism, make the large-scale ring work piece of numerical control revolving stage clamping steadily, through designing first guide rail, first sliding seat and cassette adjusting part, before the ring work piece is pressed from both sides again, can adjust the hookup location of cassette body at first sliding seat according to the ring work piece size flexible regulation clamping, and be connected through the rack cooperation between cassette body and the first sliding seat, and through first fastener locking, the location of first convenience cassette body, second can guarantee that the tight fit of cassette body and first sliding seat is connected, avoid the ring work piece to take place slight aversion and influence machining precision because of vibrations in the course of working of digit control machine tool.

Inventors

WENG QIANG
Yu Lefeng
CHEN BOMIN
KANG JIA
HUANG ZHIJIE

Assignees

福建省威诺数控有限公司

Dates

Publication Date: 20260505
Application Date: 20220321

Claims (10)

1. High accuracy ring work piece numerical control revolving stage is from centering clamping device, its characterized in that includes: A base; The turntable body is connected to the upper part of the base; the hydraulic chuck mechanism is connected to the upper part of the turntable body and comprises a chuck body and a plurality of sliding blocks, the sliding blocks are distributed in a circumferential array and are connected to the chuck body in a sliding manner, and the distances between the sliding blocks and the central axis of the chuck body are the same; the support disc is connected to the turntable body; The rolling support mechanisms are distributed on the base in a circumferential array, and the lower parts of the support discs are in rolling connection with the rolling support mechanisms; The first guide rails are connected to the upper part of the supporting disc in a circumferential array mode, the number of the first guide rails is the same as that of the sliding blocks, and the first guide rails are parallel to the sliding direction of one sliding block; The first sliding seat is in sliding connection with the first guide rail, the first sliding seat is connected with one of the sliding blocks, and a first rack is arranged on the upper surface of the first sliding seat; The clamping seat adjusting assembly comprises a clamping seat body and a first fastening piece, wherein a second rack matched with the first rack is arranged at the lower part of the clamping seat body, the clamping seat body is connected to the upper part of the first sliding seat, the clamping seat body comprises a supporting part for supporting a circular ring workpiece and a clamping part for clamping the outer circumferential surface or the inner circumferential surface of the circular ring workpiece, and the first fastening piece is used for fastening and connecting the clamping seat body and the first sliding seat; The first rack comprises rack monomers which are parallel and symmetrical, a strip-shaped dovetail groove is arranged between the two rack monomers to serve as a second guide rail, a limiting piece which is in sliding fit with the dovetail groove is arranged at the lower part of the clamping seat body to limit the clamping seat body, the first fastener is a screw in the vertical direction, a screw hole in the vertical direction is formed in the position, opposite to the bottom of the dovetail groove, of the clamping seat body, and the bottom of the screw is tightly matched with the bottom of the dovetail groove through screwing the screw in the screw hole.
2. The high precision ring workpiece numerical control turret self-centering clamping device of claim 1, further comprising an oil supply assembly comprising: The first oil supply support is connected to the base; The cylinder body of the hydraulic cylinder is connected to the first oil supply support, and the moving direction of the hydraulic cylinder is the radial direction of the turntable body; the first integrated block is connected with a piston rod of the hydraulic cylinder; The oil outlet end of the first oil inlet connecting pipe is connected with the first integrated block; the oil inlet end of the first oil outlet connecting pipe is connected to the first integrated block; the oil inlet end of the first oil inlet connecting pipe is connected with the hydraulic station, and the oil outlet end of the first oil outlet connecting pipe is connected with the hydraulic station; a second integrated block connected to an outer circumferential portion of the support disc; The oil inlet end of the second oil inlet connecting pipe is connected to the second integrated block, and the oil inlet end of the second oil inlet connecting pipe and the oil outlet end of the first oil inlet connecting pipe are positioned at the same height; The oil outlet end of the second oil outlet connecting pipe and the oil inlet end of the first oil outlet connecting pipe are positioned at the same height; The oil outlet end of the second oil inlet connecting pipe is connected to the hydraulic lock, and the oil inlet end of the second oil outlet connecting pipe is connected to the hydraulic lock; The oil inlet end of the third oil inlet connecting pipe is connected to the hydraulic lock, and the oil outlet end of the third oil inlet connecting pipe is connected to the turntable body; the oil outlet end of the third oil outlet connecting pipe is connected to the hydraulic lock, and the oil inlet end of the third oil outlet connecting pipe is connected to the turntable body.
3. The self-centering clamping device of the high-precision ring workpiece numerical control turntable, according to claim 2, is characterized in that a third rack is arranged on the upper surface of the sliding block; the sliding seat is characterized by further comprising an L-shaped connecting piece, wherein one end of the L-shaped connecting piece is provided with a fourth rack matched with the third rack, and the other end of the L-shaped connecting piece is connected with the first sliding seat; The second fastener is used for fastening and connecting the L-shaped connecting piece with the sliding block.
4. The self-centering clamping device of the high-precision ring workpiece numerical control turntable according to claim 2, wherein the clamping part of the clamping seat body is provided with two clamping bars arranged in the vertical direction.
5. The high-precision circular workpiece numerical control turntable self-centering clamping device according to claim 4, wherein the surface of the clamping strip is arc-shaped.
6. The self-centering clamping device of the high-precision ring workpiece numerical control turntable, as claimed in claim 2, wherein a second guide rail is arranged in the center of the upper part of the first sliding seat, and the clamping seat body is connected with the second guide rail in a sliding fit manner.
7. The self-centering clamping device of the high-precision circular workpiece numerical control turntable according to claim 2, wherein 2 clamping seat adjusting assemblies are connected to the upper portion of each first sliding seat, and clamping portions of the 2 clamping seat adjusting assemblies face opposite directions.
8. The high-precision ring workpiece numerical control turntable self-centering clamping device according to claim 2, further comprising an auxiliary supporting mechanism, wherein the auxiliary supporting mechanism comprises: the plurality of third guide rails are connected to the upper part of the supporting disc in a circumferential array mode, and the directions of the third guide rails are radial to the turntable body; the sliding support seat is connected with the third guide rail in a sliding fit manner and is used for supporting the annular workpiece in an auxiliary manner; and the third fastener is used for fastening connection between the sliding support seat and the third guide rail.
9. The high-precision circular workpiece numerical control turntable self-centering clamping device is characterized in that the number of the sliding blocks is 3, the number of the first guide rails is 3, the number of the first sliding seats is 3, and the number of the third guide rails is 3.
10. The method for clamping the circular workpiece by using the self-centering clamping device of the numerical control turntable of the circular workpiece with high precision according to any one of claims 2 to 9, which is characterized by comprising the following steps: Step 1, adjusting the connection positions of the first sliding seats on the first guide rail to enable the vertical distance between each first sliding seat and the axis of the rotary table body to be the same, adjusting the connection positions of the clamping seat bodies on the first sliding seats to enable the vertical distance between each clamping seat body and the axis of the rotary table body to be the same, and enabling the clamping seat bodies to be fixedly connected with the first sliding seats through first fasteners; Controlling the hydraulic cylinder to move, so that the oil outlet end of the first oil inlet connecting pipe is in butt joint with the oil inlet end of the second oil inlet connecting pipe, and the oil inlet end of the first oil outlet connecting pipe is in butt joint with the oil outlet end of the second oil outlet connecting pipe; Setting the circular ring workpiece on the support part of each clamping seat body, controlling the hydraulic station to supply oil to the chuck body or the hydraulic chuck to discharge oil to the hydraulic station, and controlling the oil inlet or oil outlet locking of the hydraulic lock to enable each sliding block of the chuck body to synchronously move, so that the clamping part of the clamping seat body clamps the inner circumference or the outer circumference of the circular ring workpiece; Controlling the oil inlet and the oil outlet directions of the hydraulic lock to be locked, and controlling the hydraulic cylinder to move, so that the oil outlet end of the first oil inlet connecting pipe is separated from butt joint with the oil inlet end of the second oil inlet connecting pipe, and the oil inlet end of the first oil outlet connecting pipe is separated from butt joint with the oil outlet end of the second oil outlet connecting pipe; step 5, controlling the turntable body to rotate, and processing a circular ring workpiece by using a numerical control machine tool; step 6, after the numerical control machine tool is processed, controlling the rotary table body to rotate to the position where the first integrated block and the second integrated block are opposite, and stopping rotating; Step 7, controlling the hydraulic cylinder to move, so that the oil outlet end of the first oil inlet connecting pipe is in butt joint with the oil inlet end of the second oil inlet connecting pipe, and the oil inlet end of the first oil outlet connecting pipe is in butt joint with the oil outlet end of the second oil outlet connecting pipe; and 8, controlling the oil inlet or outlet direction of the hydraulic lock to be opened, enabling all sliding blocks of the chuck body to synchronously move, enabling the clamping part of the clamping seat body to loosen clamping of the inner circumference or the outer circumference of the circular workpiece, and taking down the circular workpiece.

Description

Self-centering clamping device and clamping method for numerical control turntable of high-precision annular workpiece The scheme is a division application of a parent application of a patent application with the application number of 202210281530.2, the application date of 2022-03-21 and the name of self-centering clamping device of a numerical control rotary table for circular workpieces and a clamping method of the numerical control rotary table. Technical Field The invention relates to the technical field of clamping devices, in particular to a high-precision circular workpiece numerical control turntable self-centering clamping device and a clamping method thereof. Background In the prior art, before a large-sized circular workpiece is required to be finished by a numerical control machine tool, the circular workpiece is required to be positioned and clamped on a fixture tool, and although the prior art has a technology of centering and clamping the circular workpiece by a three-jaw chuck, the existing three-jaw chuck is difficult to be directly suitable for centering and clamping the large-sized circular workpiece. At present, large-scale ring work piece adopts the manual multiple adjustment location clamping mode of jack catch formula, relies on the electro-magnet to hold the work piece in order to fix after adjusting in place, and above structure has the difficult problem of ring work piece central authorities location, often needs many times to adjust, and the time that needs is long, and the pretightning force of clamping is not good to hold, and the processing procedure probably receives various effect and produces not hard up easily after the clamping, exists the potential safety hazard. The application publication number CN113528770A discloses a hydraulic clamping device for large-scale lasso parts, make this support remove the subassembly or press from both sides tight removal subassembly action through rotatory adjustment hand wheel, through big bevel gear's transition, other support remove the subassembly and press from both sides tight removal subassembly and act together, thereby realize supporting seat and clamping seat along the radial adjustment position of swivel work head, until the supporting seat adjusts to target position, clamping seat adjusts to near the part and wait to grasp lateral wall department, thereby realize supporting seat and clamping seat along the radial adjustment position of swivel work head, satisfy the clamping needs of different part diameters or excircle hole, then pass through the pneumatic cylinder with power transmission for power chuck, realize power chuck action, power chuck passes through the pull rod and gives m clamping seat respectively, m clamping seat is along the equidirectional homorange removal of respective first guide rail with the chucking part and guarantee that the center of part is invariable throughout. The hydraulic clamping device for the large-sized ferrule parts is mainly used for supporting, positioning and clamping the parts on a quenching machine tool, the quenching machine tool is low in clamping precision requirement because the quenching machine tool is used for machining the parts, a grating ruler is not required to be arranged in the clamping device, the workpieces cannot be subjected to various external forces in the quenching process, looseness is not easy to occur, the numerical control machine tool is required to finish the workpieces with extremely high precision, the precision and stability requirements on workpiece clamping are extremely high, the numerical control machine tool is required to perform operations such as milling and drilling on the workpieces, vibration is generated on the workpieces in the machining process, and if the clamping stability is poor, the clamping of the workpieces is loose, so that the hydraulic clamping device for the quenching machine tool is difficult to directly apply to the field of the numerical control machine tool. Therefore, how to improve the structure of the numerical control machine tool clamping device for the circular ring workpiece, so that the efficiency and the precision of centering and clamping the circular ring workpiece can be improved, and the workpiece clamping can be ensured to maintain proper pretightening force, so that the workpiece clamping device cannot loosen in the machining processes of milling, drilling and the like, and the technical problem to be solved is urgent. Disclosure of Invention The technical problem to be solved by the invention is how to improve the structure of the numerical control machine tool clamping device for the circular ring workpiece, so that the efficiency and the precision of centering and clamping the circular ring workpiece can be improved, and the workpiece clamping can be ensured to keep proper pretightening force, so that the circular ring workpiece cannot loosen in the machining processes of milling, drilling and the like. In orde