CN210125887U

CN210125887U - Automatic centering machine tool center frame

Info

Publication number: CN210125887U
Application number: CN201920778073.1U
Authority: CN
Inventors: 黄运新; 冯遵香; 黄振寰
Original assignee: Xuzhou Wuding Machinery Technology Co ltd
Current assignee: Xuzhou Wuding Machinery Technology Co ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-03-06
Anticipated expiration: 2029-05-28

Abstract

The utility model provides an automatic centering lathe centre frame, it mainly includes the base, through the slide of guide rail setting on the base to and set up the gyro wheel support on the slide, set up the piston cylinder in the base bottom, the principle of main adoption is: after the work piece home position of processing confirms, the position of the tight spare part of the clamp of self-centering lathe centre frame adapts to the work piece home position of processing through the regulation compensation of self, and positioning accuracy is irrelevant with the manufacturing error, installation error and the motion error of the tight spare part of clamp on the horizontal direction, the utility model has the advantages of the precision is high, still has efficient, low in labor strength's advantage simultaneously.

Description

Automatic centering machine tool center frame

Technical Field

The invention relates to a machine tool accessory, in particular to a machine tool center frame, especially relates to an automatic centering machine tool center frame, and belongs to the technical field of machine tool tools.

Background

It is known that: at present, the traditional machine tool center frame is fixed on a lathe guide rail through a pressing plate in the working process, an upper cover is opened, a workpiece is placed in the center frame, three supporting blocks are manually adjusted, the coaxiality is guaranteed, the upper cover is closed, a bolt is screwed, and the machine tool can be started to work, and obviously, the machine tool center frame has the following defects: 1. the manual adjustment of the three supporting point pairs has low efficiency and poor precision; 2. the workpiece and the supporting block are in sliding friction, so that the workpiece is easy to wear and short in service life; 3. the three cylindrical supporting points belong to a cantilever structure, have poor rigidity and are easy to vibrate; 4. the safety is poor, the traditional center frame is fastened with an upper cover and a lower cover by a fastening bolt, if the centering effect of a workpiece is poor in processing, the center frame is easily twisted off in rotation to cause equipment and personal accidents, and in order to solve the problems, the invention patent with the Chinese invention application number of 200910182058.1, the publication number of CN 101628381B and the name of 'automatic centering and rolling support center frame' discloses a technology which can effectively overcome the defects, but the technology still has the insurmountable defects and mainly comprises the following steps: 1. the working process is manually adjusted, so that the defects of high labor intensity and low labor efficiency exist; 2. automatic positioning mainly drives the rotation of stock screw through rotating the hand wheel among this technique, stock screw drives the jack catch and controls the deciliter motion, realize that gyro wheel centre gripping work piece on the jack catch reaches automatic positioning's purpose, however, because stock screw inevitably can have manufacturing error, with it complex nut and other moving parts also inevitably have manufacturing and installation error, so, in the deciliter motion process about stock screw drives the jack catch, two jack catches are close to the center and leave the center distance and must have the error with theoretical position, this will lead to the centering inaccurate, not only cause the work piece quality of processing to reduce easily, there is scrapped occurence of failure even.

Disclosure of Invention

The invention aims to: aiming at the defects existing in the prior art, the invention provides a technology which can effectively overcome the defects, namely the center frame of the automatic centering machine tool.

The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides an automatic centering lathe centre frame, it mainly includes base 1, base 1's bottom system have with lathe bed 24 on guide rail assorted guide rail groove, base 1 passes through the guide rail groove installation of bottom to be fixed on lathe bed 24 leads, base 1 can follow lathe bed 24 under the state of unblock and go up the guide rail and slide to adjust the mounted position according to the needs of work, at the state of work, base 1 is then fixed by locking device base 1 above be provided with first guide rail 2, the length direction of first guide rail 2, promptly: the guide direction of the first guide rail 2 is vertical to the guide rail of the machine tool body 24, the first guide rail 2 is provided with a sliding plate 5, the sliding plate 5 can slide on the first guide rail 2 in a free state, the middle position of the sliding plate 5 is provided with a long hole 20, the length direction H of the long hole 20 is consistent with the length direction of the first guide rail 2, the middle position of the bottom of the base 1 is fixedly provided with a piston cylinder 3, the piston rod of the piston cylinder 3 passes through the through hole on the base 1, passes through the first guide rail 2 and passes through the long hole 20 to reach the upper plane of the sliding plate 5, the end part of the piston rod of the piston cylinder 3 is fixedly provided with a pressing plate 19, the lower cavity of the piston cylinder 3 is internally provided with a first return spring 4, under the condition that no pressure medium is introduced into the upper cavity of the piston cylinder 3, the return spring 4 pushes the piston upwards to drive the piston rod, at this time, the sliding plate 5 can slide in the length direction of the first guide rail 2, but, because the piston rod of the piston cylinder 3 is arranged in the middle long hole 20 of the sliding plate 5, the sliding distance of the sliding plate 5 is limited within the length H range of the long hole 20, when the piston rod of the piston cylinder 3 is filled in the piston upper cavity of the piston, the piston is pushed upwards, the piston rod and the pressing plate 19 are driven to descend, the pressing plate 19 is contacted with the upper plane of the sliding plate 5 and presses the sliding plate 5, at this time, the sliding plate 5 is limited in the length direction of the first guide rail 2, the fixed bracket 6 is arranged on the sliding plate 5 on one side of the long hole 20, the second guide rail 18 is fixedly arranged on the sliding plate 5 on the other side of the long hole 20, the guiding direction of the second guide rail 18 is consistent with the guiding direction of the first guide rail 2, the slide block 12 is arranged on the second guide rail 18, and the slide block 12 has the freedom degree of sliding along the guiding, the top of the sliding block 12 is equal to the top of the fixed support 6 and has the same cross-sectional shape, a roller support 9 is fixedly installed on the top of the sliding block 12 and the top of the fixed support 6 respectively through bolts 10, a V-shaped opening 23 is formed on one side opposite to the two roller supports 9, a plane 22 formed by sharp-angled bottom lines of the two V-shaped openings 23 is a horizontal plane, a roller 11 is fixedly installed at the upper and lower positions of the V-shaped opening 23 of each roller support 9 through a spindle center 21 of the machine tool, the roller 11 at the upper and lower positions of the V-shaped opening 23 of each roller support 9 is symmetrical relative to the plane 22, a bearing seat 16 is fixedly arranged on the sliding plate 5 at the outer end of the second guide rail 18, one end of the lead screw 14 is rotatably installed on the bearing seat 16 through a bearing 15, and a lead screw nut 13 is installed on the inward horizontal extending part of the lead screw 14 in a mode of internal and, the outer circle part of the screw nut 13 is fixedly connected with the sliding block 12, the outer end part of the screw nut 13 is connected with a driving device 17, the driving device 17 is a power device and a power transmission system which can drive the screw 14 to rotate, a spring support 7 is fixedly arranged on the base 1, a second return spring 8 is arranged between the spring support 7 and the sliding plate 5, and the second return spring 8 has the tendency that the sliding plate 5 always moves rightwards.

The working process and the working principle of the invention are as follows: before the workpiece 27 starts to be machined, the driving device 17 is started to work, the driving device 17 drives the screw rod 14 to rotate in a required direction, so that the minimum opening distance between the two roller supports 9 is larger than the maximum excircle of a blank part of the workpiece 27 to be installed, normal installation of the workpiece is ensured, meanwhile, no pressure medium is introduced into a piston upper cavity of the piston cylinder 3, the piston is pushed upwards by the first return spring 4, the piston rod and the pressure plate 19 are driven to ascend, the pressure plate 19 is separated from contact with the upper plane of the sliding plate 5, and the sliding plate 5 always has a rightward movement trend due to the second return spring 8, so under the action of the second return spring 8, the sliding plate 5 and the two roller supports 9 installed and fixed on the sliding plate 5 correspondingly move rightwards simultaneously, the machine tool spindle center 21 is approximately positioned at the middle position of the two roller supports 9, and installation of, at this time, one end of the blank of the workpiece 27 is clamped by a chuck 25 of the machine tool, the other end is pressed by a tip 26 at the tail of the machine tool, then a reference outer circular surface M is machined on the blank of the workpiece 27, obviously, the central axis of the reference outer circular surface M coincides with the center 21 of the main shaft of the machine tool, then the control drive device 17 is started to start a different working mode from the previous one, the drive device 17 at this time drives the lead screw 14 to move in the direction opposite to the previous direction, at this time, the drive lead screw 14 pushes the slide block 12, the left side roller bracket 9 and the two rollers 11 mounted thereon to approach to the side of the reference outer circular surface M of the workpiece 27, after the two rollers 11 on the left side roller bracket 9 contact with the side of the reference outer circular surface M of the workpiece 27, because the workpiece 27 is axially fixed by the chuck 25 and the tip 26, therefore, under the condition that the lead screw 14 continues to rotate, the movement of, i.e. the movement of the slide block 12 is stopped by the obstruction, so that the slide plate 5 at this time starts to move leftwards, obviously, in this case, the two rollers 11 at the right side approach the workpiece 27 from the other side of the reference outer circular surface M of the workpiece 27, as a result, the four rollers 11 clamp the workpiece 27 at the reference outer circular surface M, and then the pressure medium is introduced into the piston cavity of the piston cylinder 3 to push the piston upwards, thereby driving the piston rod and the pressure plate 19 to descend, the pressure plate 19 contacts with the upper plane of the slide plate 5 and presses the slide plate 5, at this time, the sliding freedom of the slide plate 5 on the first guide rail 2 is limited, at this time, the tip 26 is removed, at this time, since the position of the workpiece 27 is not changed, the position of the four rollers 11 clamping the workpiece 27 is also fixed, so, even after the tip 26 is removed, the rotation center of the workpiece 27 can, the positioning device is not influenced by the movement precision, the installation precision and the manufacturing error of the clamp in the horizontal direction, and has the advantage of high precision, and although the positioning precision can also be influenced by the error of the roller 11 in the height direction, the size of the roller 11 in the height direction is fixed, so that the manufacturing precision and the installation precision can be completely guaranteed by improving.

Has the advantages that: in the present invention, the position of the part where the jig operates in the horizontal direction is determined by the original position of the workpiece to be machined, that is: after the original position of the processed workpiece is determined,

the position of the clamping part of the center frame of the automatic centering machine tool is adjusted and compensated by the self-adjusting device to adapt to the original position of the processed workpiece, so that the position of the clamping part of the center frame of the automatic centering machine tool is irrelevant to the manufacturing error, the installation error and the motion error of the clamping part of the center frame of the automatic centering machine tool in the horizontal direction, and the automatic centering machine tool has the advantage of high precision.

Drawings

FIG. 1 is a schematic diagram of the principles of the present invention;

FIG. 2 is a front view of the present invention in a state of clamping a workpiece;

FIG. 3 is a schematic view of a portion of FIG. 2 in the direction A;

shown in the figure: 1 is a base; 2 is a first guide rail; 3 is a piston cylinder; 4 is a first return spring; 5 is a slide plate; 6 is a fixed support; 7 is a spring support; 8 is a second return spring; 9 is a roller bracket; 10 is a bolt; 11 is a roller; 12 is a slider; 13 is a lead screw nut; 14 is a lead screw; 15 is a bearing; 16 is a bearing seat; 17 is a driving device; 18 is a second guide rail; 19 is a platen; 20 is an elongated hole; 21 is the main shaft center; 22 is a plane; 23 is a V-shaped opening; 24 is a machine bed; 25 is a chuck; 26 is a tip; 27 is a workpiece; m is a reference outer circular surface.

Detailed Description

With reference to fig. 1, 2 and 3, the embodiment of the present invention is: the utility model provides an automatic centering lathe centre frame, it mainly includes base 1, base 1's bottom system have with lathe bed 24 on guide rail assorted guide rail groove, base 1 passes through the guide rail groove installation of bottom to be fixed on lathe bed 24 leads, base 1 can follow lathe bed 24 under the state of unblock and go up the guide rail and slide to adjust the mounted position according to the needs of work, at the state of work, base 1 is then fixed by locking device base 1 above be provided with first guide rail 2, the length direction of first guide rail 2, promptly: the guide direction of the first guide rail 2 is vertical to the guide rail of the machine tool body 24, the first guide rail 2 is provided with a sliding plate 5, the sliding plate 5 can slide on the first guide rail 2 in a free state, the middle position of the sliding plate 5 is provided with a long hole 20, the length direction H of the long hole 20 is consistent with the length direction of the first guide rail 2, the middle position of the bottom of the base 1 is fixedly provided with a piston cylinder 3, the piston rod of the piston cylinder 3 passes through the through hole on the base 1, passes through the first guide rail 2 and passes through the long hole 20 to reach the upper plane of the sliding plate 5, the end part of the piston rod of the piston cylinder 3 is fixedly provided with a pressing plate 19, the lower cavity of the piston cylinder 3 is internally provided with a first return spring 4, under the condition that no pressure medium is introduced into the upper cavity of the piston cylinder 3, the return spring 4 pushes the piston upwards to drive the piston, at this time, the sliding plate 5 can slide in the length direction of the first guide rail 2, but, because the piston rod of the piston cylinder 3 is arranged in the middle long hole 20 of the sliding plate 5, the sliding distance of the sliding plate 5 is limited within the length H range of the long hole 20, when the piston rod of the piston cylinder 3 is filled in the piston upper cavity of the piston, the piston is pushed upwards, the piston rod and the pressing plate 19 are driven to descend, the pressing plate 19 is contacted with the upper plane of the sliding plate 5 and presses the sliding plate 5, at this time, the sliding plate 5 is limited in the length direction of the first guide rail 2, the fixed bracket 6 is arranged on the sliding plate 5 on one side of the long hole 20, the second guide rail 18 is fixedly arranged on the sliding plate 5 on the other side of the long hole 20, the guiding direction of the second guide rail 18 is consistent with the guiding direction of the first guide rail 2, the slide block 12 is arranged on the second guide rail 18, and the slide block 12 has the freedom degree of sliding along the guiding, the top of the sliding block 12 is equal to the top of the fixed support 6 and has the same cross-sectional shape, a roller support 9 is fixedly installed on the top of the sliding block 12 and the top of the fixed support 6 respectively through bolts 10, a V-shaped opening 23 is formed on one side opposite to the two roller supports 9, a plane 22 formed by sharp-angled bottom lines of the two V-shaped openings 23 is a horizontal plane, a roller 11 is fixedly installed at the upper and lower positions of the V-shaped opening 23 of each roller support 9 through a spindle center 21 of the machine tool, the roller 11 at the upper and lower positions of the V-shaped opening 23 of each roller support 9 is symmetrical relative to the plane 22, a bearing seat 16 is fixedly arranged on the sliding plate 5 at the outer end of the second guide rail 18, one end of the lead screw 14 is rotatably installed on the bearing seat 16 through a bearing 15, and a lead screw nut 13 is installed on the inward horizontal extending part of the lead screw 14 in a mode of internal and, the outer circle part of the screw nut 13 is fixedly connected with the sliding block 12, the outer end part of the screw nut 13 is connected with a driving device 17, the driving device 17 is a power device and a power transmission system which can drive the screw 14 to rotate, a spring support 7 is fixedly arranged on the base 1, a second return spring 8 is arranged between the spring support 7 and the sliding plate 5, and the second return spring 8 has the tendency that the sliding plate 5 always moves rightwards.

Before the workpiece 27 starts to be machined, the driving device 17 is started to work, the driving device 17 drives the screw rod 14 to rotate in a required direction, so that the minimum opening distance between the two roller supports 9 is larger than the maximum excircle of a blank part of the workpiece 27 to be installed, normal installation of the workpiece is ensured, meanwhile, no pressure medium is introduced into a piston upper cavity of the piston cylinder 3, the first return spring 4 pushes the piston upwards to drive the piston rod and the pressure plate 19 to ascend, the pressure plate 19 is separated from contact with the upper plane of the sliding plate 5, and the sliding plate 5 always has a rightward movement trend due to the second return spring 8, so under the action of the second return spring 8, the sliding plate 5 and the two roller supports 9 installed and fixed on the sliding plate 5 correspondingly move rightwards simultaneously, the central line of a machine tool spindle is approximately positioned at the middle positions of the two roller supports 9, and installation of, at this time, one end of the blank of the workpiece 27 is clamped by a chuck 25 of the machine tool, the other end is pressed by a tip 26 at the tail of the machine tool, then a reference outer circular surface M is machined on the blank of the workpiece 27, obviously, the central axis of the reference outer circular surface M coincides with the center 21 of the main shaft of the machine tool, then the control drive device 17 is started to start a different working mode from the previous one, the drive device 17 at this time drives the lead screw 14 to move in the direction opposite to the previous direction, at this time, the drive lead screw 14 pushes the slide block 12, the left side roller bracket 9 and the two rollers 11 mounted thereon to approach to the side of the reference outer circular surface M of the workpiece 27, after the two rollers 11 on the left side roller bracket 9 contact with the side of the reference outer circular surface M of the workpiece 27, because the workpiece 27 is axially fixed by the chuck 25 and the tip 26, therefore, under the condition that the lead screw 14 continues to rotate, the movement of, i.e. the movement of the slide 12 is blocked and stopped, so that the slide 5 at this moment starts to move to the left, which, obviously, in this case, the two right rollers 11 will approach the workpiece 27 from the other side of the reference outer circular surface M of the workpiece 27, so that the four rollers 11 clamp the workpiece 27 at the position of the reference outer circular surface M, and then the pressure medium is introduced into the piston upper chamber of the piston cylinder 3 to push the piston upwards, thereby lowering the piston rod and the pressure plate 19, the pressure plate 19 contacts with the upper plane of the sliding plate 5, and the slide 5 is pressed, at which point the freedom of sliding of the slide 5 on the first guide rail 2 is limited, at which point the tip 26 is removed, at which point, since the position of the workpiece 27 is not changed, the positions of the four rollers 11 that grip the workpiece 27 are also fixed, therefore, even if the center 26 is removed, it is ensured that the rotation center of the workpiece 27 is kept identical to the original one.

Claims

1. The utility model provides an automatic centering lathe centre frame, it mainly includes base (1), base (1) above be provided with first guide rail (2), characterized by: a sliding plate (5) is arranged on the first guide rail (2), a long hole (20) is formed in the middle of the sliding plate (5), the length direction H of the long hole (20) is consistent with the length direction of the first guide rail (2), a piston cylinder (3) is fixedly arranged in the middle of the bottom of the base (1), a piston rod of the piston cylinder (3) penetrates through a through hole in the base (1), penetrates through the first guide rail (2), penetrates through the long hole (20) and then reaches the upper plane of the sliding plate (5), a pressing plate (19) is fixedly arranged at the end of the piston rod of the piston cylinder (3), a first return spring (4) is arranged in a piston lower cavity of the piston cylinder (3), a fixing support (6) is arranged on the sliding plate (5) on one side of the long hole (20), a second guide rail (18) is fixedly arranged on the sliding plate (5) on the other side of the long hole (20), the guide direction of the second guide rail (18) is consistent with that of the first guide rail (2), a sliding block (12) is arranged on the second guide rail (18), and the top of the sliding block (12) is as high as that of the fixed support (6) and has the same cross section shape.

2. A self-centering machine tool center rest as claimed in claim 1, wherein: the top of the sliding block (12) and the top of the fixing support (6) are respectively and fixedly provided with a roller support (9) through bolts (10), one side, opposite to the two roller supports (9), of each roller support is provided with a V-shaped opening (23), a plane (22) formed by sharp-angled bottom lines of the two V-shaped openings (23) is a horizontal plane, a roller (11) is fixedly arranged at the upper position and the lower position of the V-shaped opening (23) of each roller support (9) through a main shaft center (21) of the machine tool, and the rollers (11) at the upper position and the lower position of the V-shaped opening (23) of each roller support (9) are symmetrical about the plane (22).

3. A self-centering machine tool center rest as claimed in claim 1, wherein: a bearing seat (16) is fixedly arranged on a sliding plate (5) at the outer side end of a second guide rail (18), one end of a lead screw (14) is rotatably arranged on the bearing seat (16) through a bearing (15), the lead screw (14) horizontally extends out of the inner part and is provided with a lead screw nut (13) in an internal and external thread matching mode, the outer circle part of the lead screw nut (13) is fixedly connected with a sliding block (12), and the outer end part of the lead screw nut (13) is connected with a driving device (17).

4. A self-centering machine tool center rest as claimed in claim 1, wherein: a spring support (7) is fixedly arranged on the base (1), a second return spring (8) is arranged between the spring support (7) and the sliding plate (5), and the second return spring (8) has the tendency that the sliding plate (5) always moves rightwards.