CN112743423A - Polishing head for repairing mold - Google Patents

Abstract

The invention discloses a polishing head for repairing a mold, which comprises a shell, a worm gear, a thermal deformation piece, a high-frequency electromagnetic induction coil, a second gear tower, a first gear tower, a hand wheel, a motor, a clamping piece and a polishing head, wherein the shell is a supporting main body, the motor drives the polishing head to rotate through the clamping piece so as to realize the surface modification of the mold, the polishing head can be fed and retreated by rotating the hand wheel during manual feeding, the manual feeding has five gears, and the polishing head can be used for idle stroke movement of the polishing head and rough machining of the surface of the mold so as to improve the repairing efficiency; the micro-motion sliding block can be pushed rightwards during thermal stress feeding, the thermal deformation piece is heated through the high-frequency electromagnetic induction coil, micro-feeding of the polishing head is achieved according to the principle of thermal expansion and cold contraction, thermal stress feeding can be adopted during fine finishing of the surface of the die, and the machining quality of the surface of the die is improved.

Description

Polishing head for repairing mold

Technical Field

The invention relates to the field of machining, in particular to a polishing head for repairing a mold.

Background

Molds play an extremely important role in modern industry, and the quality of a mold directly determines the quality of a product. The mold industry in China is rapidly developed in recent years and ascends three mold production countries in the world, but the mold industry in China has a larger difference compared with the production level of foreign advanced molds, and the difference is mainly expressed in the aspects of long manufacturing period, low manufacturing precision, short service life of the molds and the like, wherein the problem of short service life of the molds is particularly prominent, and the resource waste and the production cost are directly increased, so that the failed molds are repaired and reused, the service time of the molds is prolonged, unnecessary loss in production is recovered, the development of industry and national economy is greatly promoted, and the mold industry has remarkable economic benefit and social significance.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a polishing head for repairing a mold, which is novel in structure and convenient to use.

The technical scheme adopted by the invention is as follows: a polishing head for repairing a mold, which is called a trimming head mechanism and comprises a shell, a worm, a fourth bevel gear, a worm wheel, a rotating sleeve, a thermal deformation piece, a high-frequency electromagnetic induction coil, a moving shaft, a threaded shaft, a third bevel gear, a second gear tower, a first gear tower, a second bevel gear, a first bevel gear, a rear cover, a hand wheel, a sliding frame, a spring, a shifting rod, a pull rod, a driven gear, a driven pinion, a second retaining rod, a transmission pinion, a motor, a clamping piece, a polishing head, a first retaining rod, a driving gear, a driving pinion, a retaining piece and a top ball, and is characterized in that: the shell is a supporting main body, the motor drives the polishing head to rotate through the clamping piece to finish the surface of the die, the polishing head can be fed and retreated through rotating the hand wheel during manual feeding, five gears are provided for manual feeding, the manual feeding can be used for idle stroke movement of the polishing head and rough machining of the surface of the die, and the repairing efficiency is improved; the micro-motion sliding block can be pushed rightwards during thermal stress feeding, the thermal deformation piece is heated through the high-frequency electromagnetic induction coil, micro-feeding of the polishing head is achieved according to the principle of thermal expansion and cold contraction, thermal stress feeding can be adopted during fine finishing of the surface of the die, and the machining quality of the surface of the die is improved.

Preferably, four guide strips are uniformly distributed on the right end of the shell in the circumferential direction, a micro-motion sliding block and micro-motion scales are arranged on the upper side of the shell, a transverse groove and gear scales are arranged on the side face of the shell, five top beads are arranged on the upper side of the transverse groove, each top bead corresponds to one gear of manual feeding and is used for realizing accurate positioning of the sliding frame, four guide rails are horizontally arranged on two side walls of the inner side of the sliding frame, a rear cover is fixedly installed at the left end of the shell through screws and is provided with threaded holes, a hand wheel is installed on the upper side of the shell and forms a rotation pair, a first bevel gear is coaxially and fixedly connected with the lower end of the hand wheel, a rotation sleeve is installed inside the shell and forms a rotation pair with the shell through four bearings, a worm wheel is coaxially and fixedly installed at the left end of.

Preferably, the right end of the rotating sleeve is provided with an internal thread structure, four guide grooves and external thread structures are uniformly distributed on the outer side surface of the threaded shaft in the circumferential direction, the four guide grooves are matched and installed with four guide strips at the right end of the shell, so that the threaded shaft and the shell form a moving pair, the external thread structure on the outer side surface of the threaded shaft and the internal thread structure at the right end of the rotating sleeve are matched and installed to form a thread pair, and when the rotating sleeve rotates clockwise, the threaded shaft can move rightwards.

Preferably, the right end of the threaded shaft is provided with an internal spline, an external spline arranged at the left end of the movable shaft is matched and installed with the internal spline, so that the movable shaft and the threaded shaft form a moving pair, the thermal deformation piece is coaxially installed inside the threaded shaft, the left end of the thermal deformation piece is fixedly connected with the left end inside the threaded shaft through a nut, the right end of the thermal deformation piece is fixedly connected with the movable shaft through a thread, and the high-frequency electromagnetic induction coil is installed between the thermal deformation piece and the threaded shaft and used for heating the thermal deformation piece; the polishing head is tightly connected with the output shaft of the motor through a clamping piece, and the motor is fixedly arranged at the right end of the movable shaft.

Preferably, a five-layer gear structure is arranged on the first gear tower, the reference circle diameters of the five-layer gear structure are in an equal-difference number sequence and form five gears, the first gear tower is obliquely arranged in the shell and forms a rotating pair, the large end of the first gear tower faces to the right from the left, the second bevel gear is coaxially and fixedly connected with the left end of the first gear tower, the second bevel gear and the first bevel gear form gear meshing transmission, the parameters of the five-layer gear structure arranged on the second gear tower are the same as those of the five-layer gear structure on the first gear tower, the second gear tower is obliquely arranged in the shell and forms a rotating pair, the large end of the second gear tower faces to the left from the right, the second gear tower is positioned above the first gear tower, the central axes of the first gear tower and the second gear tower are parallel to each other, the third bevel gear tower is coaxially and fixedly connected with.

Preferably, the sliding frame is arranged inside the shell, the right end of the sliding frame is positioned in the transverse slot, the two sliding block structures arranged at the left end of the sliding frame and the two sliding block structures arranged at the right end of the sliding frame are respectively matched and arranged with four guide rails on two side walls inside the shell, so that the sliding frame and the shell form a moving pair, the sliding frame is provided with a round hole and a long slot hole close to the middle position, the right end of the sliding frame is provided with a gear pointer and a positioning hole, the second retaining rod is arranged in the round hole to form a rotating pair, two transmission auxiliary gears are respectively and coaxially and tightly arranged at two ends of the second retaining rod, the first retaining rod can slide in the long slot hole, the driving gear is positioned at the lower side between the first retaining rod and the second retaining rod, the two driving auxiliary gears are respectively and coaxially and tightly arranged at two ends of the driving gear, two ends, the driving pinion is always meshed with the driving pinion, an annular groove is formed in the middle of the driven gear to prevent interference with the driving gear when the feeding gear is changed, the driven gear is located on the upper side between the first retaining rod and the second retaining rod, the two driven pinions are respectively and coaxially and fixedly mounted at two ends of the driven gear, two ends of the driven gear are rotatably connected with the first retaining rod through the two retaining pieces, and two ends of the driven gear are further rotatably connected with the second retaining rod through the two retaining pieces to enable the driven pinions to be always meshed with the driving pinion.

Preferably, the left end of the pull rod and the first retaining rod form a rotating pair, a spring is arranged between the left end of the pull rod and the right side of the sliding frame, the right end of the pull rod and the upper end of the deflector rod form a rotating pair, and the lower end of the deflector rod is provided with a cross rod structure convenient to hold.

In the initial state, the deflector rod is in a vertical state, the pull rod moves leftwards under the action of the elastic force of the spring, so that the first retaining rod slides leftwards in the long slot, the driving gear moves downwards and is meshed with one gear of the first gear tower, and the driven gear moves upwards and is meshed with a corresponding gear on the second gear tower under the action of the thrust of the eight retaining pieces.

Preferably, the motor drives the sanding head to rotate, thereby achieving the surface finish of the mold.

The chucking piece can be with polishing head and motor output shaft fastening connection, can take off the polishing head and change other kinds of polishing head according to mould material and surface characteristic after unscrewing the chucking piece.

The idle stroke or the rough machining of the surface of the die can adopt manual feeding: after the hand wheel is rotated clockwise, the first bevel gear drives the first gear tower to rotate clockwise through the second bevel gear, the first gear tower drives the driving gear to rotate anticlockwise through gear meshing, so that the driving pinion rotating anticlockwise drives the driven pinion to rotate anticlockwise through the gear meshing relation between the driving pinion and the driven pinion, the driven pinion drives the second gear tower and the third bevel gear to rotate clockwise through the gear meshing relation between the driven gear and the second gear tower, the third bevel gear drives the fourth bevel gear and the worm to rotate clockwise, the worm drives the worm gear and the rotating sleeve to rotate clockwise, and under the transmission action of the thread pair, the moving shaft moves rightwards, so that the polishing head moves rightwards and feeds; the backward movement of the polishing head can be realized by rotating the hand wheel anticlockwise.

The manual feeding has five gears which can be indicated on the gear scale by the gear pointer, when the transmission ratio needs to be increased to slow down the feeding speed, the shift lever is firstly pulled upwards to a horizontal state, in the process, the pull rod pulls the first retaining rod to move rightwards, under the action of the pulling force of the eight retaining pieces, the driving gear moves upwards and is disengaged from the gear on the first gear tower, the driven gear moves downwards and is disengaged from the gear on the second gear tower, then the driving lever moves rightwards to a proper gear, the top ball is clamped into the positioning hole to accurately position the sliding frame, the driving gear is engaged with the smaller gear on the first gear tower, the driven gear is engaged with the larger gear on the second gear tower, thereby increasing the transmission ratio between the first gear tower and the second gear tower and reducing the feeding speed of the polishing head; conversely, moving the lever to the left, the transmission ratio may be decreased to increase the feed rate of the sanding head.

Thermal stress feed may be used for fine trimming of the die surface: when the micro-motion sliding block slides rightwards, the high-frequency electromagnetic induction coil is electrified, the thermal deformation piece is heated according to the electromagnetic induction heating principle, the temperature of the thermal deformation piece is increased, the thermal deformation piece is extended according to the physical properties of thermal expansion and cold contraction, the polishing head is slightly fed, and the surface of the die is finely trimmed; the micro-feeding precision realized according to the heat effect can reach micron level, and the surface finishing of the high-precision die can be met.

After the temperature and the elongation of the thermal deformation piece are calibrated, the scales indicated by the micro-motion slide block on the micro-motion scales can enable the high-frequency electromagnetic induction coil to heat the thermal deformation piece to the corresponding temperature, so that the control of the micro-motion slide block on the thermal stress feeding amount is realized.

The invention has the beneficial effects that:

the trimming head mechanism has two feeding modes of manual feeding and thermal stress feeding, the manual feeding is adopted during idle stroke or rough machining, the repairing efficiency can be improved, and the thermal stress feeding is adopted during fine trimming of the surface of the die, so that the machining quality of the surface of the die can be improved;

manual feeding has a five-gear speed regulation function, a small transmission ratio is adopted during idle stroke, the moving time of a polishing head can be shortened, a large transmission ratio is adopted during rough machining of the surface of the die, and the repair speed is accelerated;

the shifting action of manual feeding can be realized by changing the position of the shifting lever, when the shifting lever is in a left end gear position, the feeding speed is fastest, when the shifting lever is in a right end gear position, the feeding speed is slowest, and the feeding gear position can be visually displayed on a gear position scale by a gear position pointer;

when the shift lever is adopted to adjust the gears, the driving gear is disengaged from the first gear tower, the driven gear is disengaged from the second gear tower, and then the positions of the driving gear and the driven gear are moved to carry out gear change, so that the transmission structure is very compact, and the problems of complex structure and large size of a multi-gear transmission device are solved by an innovative design;

the micro-feeding precision realized by the heat effect of the thermal deformation piece can reach micron level, and the micro-feeding device has extremely high precision and can meet the requirement of finishing the surface of a high-precision die;

the feeding amount of the thermal effect feeding can be indicated on the feeding scale by the feeding slide block, so that the method is visual and clear and is convenient to operate;

and the inside of the trimming head mechanism adopts a worm and gear transmission structure, so that the transmission is stable, the self-locking function is realized, the reaction force of the surface of the die on the polishing head cannot cause the threaded shaft to move leftwards, and the processing quality of the polishing head on the surface of the die during thermal stress feeding cannot be influenced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a schematic overall structure diagram of the positioning frame mechanism.

Fig. 4 is an exploded view of the positioner mechanism.

Fig. 5 is a partial schematic view of the carriage mechanism.

Fig. 6 is a partial schematic view of the carriage mechanism.

Fig. 7 is a schematic view of the overall structure of the dressing head mechanism.

Fig. 8 is a schematic longitudinal sectional structure of the trimming head mechanism.

Fig. 9 is a schematic longitudinal sectional view of the trimming head mechanism.

Fig. 10 is a partial schematic view of the shifting mechanism.

Fig. 11 is a schematic diagram of an oblique cross-sectional structure of the trimming head mechanism.

Fig. 12 is a schematic diagram of an oblique cross-sectional structure of the trimming head mechanism.

Fig. 13 is a partial cross-sectional schematic view of a trimming head mechanism.

Fig. 14 is an exploded view of the dressing head mechanism.

Fig. 15 is a schematic view of the carriage.

Reference numerals: 1 positioning frame mechanism, 101 base, 102 positioning sleeve, 103 sliding sleeve, 103.1 second scale, 103.2 third scale, 104 upright post, 104.1 first scale, 104.2 guide groove, 105 second screw, 106 needle sleeve, 106.1 third pointer, 107 fourth screw, 108 cross arm, 108.1 cross arm disc, 108.2 fourth pointer, 108.3 second pointer, 109 third screw, 110 first screw, 111 sixth screw, 112 swinging frame, 112.1 sixth pointer, 112.2 swinging frame disc, 112.3 fifth pointer, 113 swinging rod, 113.1 upper scale, 113.2 lower scale, 114 fifth screw, 115 nut, 116 swinging head, 116.1 sixth scale, 116.2 threaded rod;

2 finishing head mechanism, 201 shell, 201.1 guide bar, 201.2 transverse groove, 201.3 gear scale, 201.4 micro sliding block, 201.5 micro scale, 202 worm, 203 fourth bevel gear, 204 worm gear, 205 rotating sleeve, 206 thermal deformation piece, 207 high-frequency electromagnetic induction coil, 208 moving shaft, 209 threaded shaft, 209.1 internal spline, 209.2 guide groove, 210 third bevel gear, 211 second gear tower, 212 first gear tower, 213 second bevel gear, 214 first bevel gear, 215 rear cover, 215.1 threaded hole, hand wheel 216, 217 sliding rack, 217.1 round hole, 217.2 slotted hole, 217.3 gear pointer, 217.4 positioning hole, 218 spring, 219 deflector rod, 220 pull rod, 221 driven gear, 221.1 driven auxiliary gear, 222 second retaining rod, 222.1 transmission auxiliary gear, 223 motor, 223.1 clamping piece, 223.2 clamping piece, 224 first retaining rod, 225, 225.1 driving auxiliary gear, 226.1 retaining piece, 226 ball, 227 grinding head.

Detailed Description

The invention will be further described with reference to the drawings and specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 and 2, a machine tool for repairing a mold includes a positioning frame mechanism 1 and a trimming head mechanism 2, and is characterized in that: the positioning frame mechanism 1 has six spatial degrees of freedom, each movable joint is provided with a graduated scale, and the trimming head mechanism 2 adopts two feeding modes of manual feeding and thermal stress feeding and is fixedly arranged at the tail end of the positioning frame mechanism 1 for repairing the surface of a mold.

As shown in fig. 3 to 6, the positioning frame mechanism 1 includes a base 101, a positioning sleeve 102, a sliding sleeve 103, a column 104, a second screw 105, a pointer sleeve 106, a fourth screw 107, a cross arm 108, a third screw 109, a first screw 110, a sixth screw 111, a swing frame 112, a yaw rod 113, a fifth screw 114, a nut 115, and a swing head 116, wherein the base 101 is fixedly mounted on the ground, the column 104 is fixedly connected with the base 101, the sliding sleeve 103 can move and rotate on the column 104 through the pointer sleeve 106 and is locked by the third screw 109, the positioning sleeve 102 and the first screw 110 facilitate height positioning of the sliding sleeve 103, the cross arm 108 and the sliding sleeve 103 form a rotation pair and is locked by the second screw 105, the yaw rod 113 and the cross arm 108 form a rotation pair and is locked by the fourth screw 107, the swing frame 112 and the yaw rod 113 form a rotation pair and is locked by the fifth screw 114, the swing head 116 may form a rotation pair with the swing frame 112 and be locked by the sixth screw 111.

As shown in fig. 7 to 15, the trimming head mechanism 2 is firmly connected with the end of the positioning frame mechanism 1, and comprises a housing 201, a worm 202, a fourth bevel gear 203, a worm wheel 204, a rotating sleeve 205, a thermal deformation member 206, a high-frequency electromagnetic induction coil 207, a moving shaft 208, a threaded shaft 209, a third bevel gear 210, a second gear tower 211, a first gear tower 212, a second bevel gear 213, a first bevel gear 214, a back cover 215, a hand wheel 216, a sliding frame 217, a spring 218, a driving lever 219, a pull rod 220, a driven gear 221, a driven pinion 221.1, a second holding rod 222, a driving pinion 222.1, a motor 223, a clamping member 223.1, a polishing head 223.2, a first holding rod 224, a driving gear 225, a driving pinion 225.1, a holding sheet 226, and a top ball 227, wherein the housing 201 is a supporting body, the motor 223 drives the polishing head 223.1 to rotate to trim the surface of the mold, and the feeding and backing of the polishing head 223.2 can be realized by rotating the hand wheel 216, the manual feeding has five gears, can be used for the 223.2 idle stroke movement of the polishing head and the rough machining of the surface of the die, and improves the repair efficiency; the micromotion sliding block 201.4 can be pushed rightwards during thermal stress feeding, the thermal deformation piece 206 is heated through the high-frequency electromagnetic induction coil 207, micro feeding of the polishing head 223.2 is achieved according to the principle of thermal expansion and cold contraction, thermal stress feeding can be adopted during fine finishing of the surface of the die, and the processing quality of the surface of the die is improved.

As shown in fig. 3 to 6, the base 101 is fixedly mounted on the ground through anchor bolts to provide stable support for the spacer mechanism 1, the lower end of the upright 104 is fixedly mounted on the upper side of the base 101 through screws to keep the upright 104 in a vertical state, the front side of the upright 104 is provided with a first scale 104.1, the left side of the upright 104 is vertically provided with a guide slot 104.2, the pointer sleeve 106 is an open cylindrical structure, the upper end of the pointer sleeve 106 is provided with a third pointer 106.1, the inner side of the pointer sleeve is longitudinally provided with a guide bar, the pointer sleeve 106 is coaxially mounted with the upright 104, the guide bar is mounted in the guide slot 104.2, so that the pointer sleeve 106 and the upright 104 form a moving pair, the upper end of the sliding sleeve 103 is provided with a third scale 103.2, the left side of the sliding sleeve is provided with a fan-shaped structure, the fan-shaped structure is provided with a second scale 103.1 and an arc-shaped hole, the longitudinal open circular hole formed on the right side of the sliding sleeve 103 can be mounted on the outer side of the pointer sleeve 106 and form, the two third screws 109 can enable the sliding sleeve 103 to clamp the thimble sleeve 106 and be fixed on the upright post 104, so that rotation locking and height positioning of the sliding sleeve 103 are realized, the positioning sleeve 102 is of an open circular ring structure, the positioning sleeve 102 and the upright post 104 are coaxially mounted and can slide on the upright post 104, a groove is formed in the plane of the upper end of the positioning sleeve 102, reading of the first scale 104.1 is facilitated, and the positioning sleeve 102 can be fixed on the upright post 104 by tightening the first screw 110.

When the height of the sliding sleeve 103 needs to be adjusted, the first screw 110 is firstly unscrewed, the positioning sleeve 102 is moved to move the upper end plane to the target scale, the first screw 110 is locked to fasten the positioning sleeve 102 on the upright post 104, then the two third screws 109 are unscrewed, the sliding sleeve 103 is moved downwards to enable the lower end plane to be tightly attached to the upper end plane of the positioning sleeve 102, and then the two third screws 109 are locked to finish the accurate height adjustment of the sliding sleeve 103.

The left end of the cross arm 108 is of an open structure and is provided with a second pointer 108.3, the right end of the cross arm 108 is provided with a cross arm disc 108.1 and a fourth pointer 108.2, the left side of the cross arm 108 and the sliding sleeve 103 form a rotation pair, the second screw 105 can penetrate through an arc hole on the left side of the sliding sleeve 103 to enable the left end of the cross arm 108 to clamp a sector structure on the left side of the sliding sleeve 103, so that the rotation locking of the cross arm 108 is realized, the rotation angle of the cross arm 108 relative to the sliding sleeve 103 can be indicated on a second scale 103.1 through the second pointer 108.3, three arc holes are uniformly distributed on the cross arm disc 108.1 in the circumferential direction, the upper end of the yaw rod 113 is provided with an upper scale 113.1, the upper scale 113.1 is provided with a fourth scale and three threaded holes uniformly distributed in the circumferential direction, the upper scale 113.1 can form a rotation pair with the cross arm disc 108.1 and can be locked through three fourth screws 107, the rotation angle of, the lower end of the horizontal swing rod 113 is provided with a lower dial 113.2, the lower dial 113.2 is provided with a fifth scale and three threaded holes which are uniformly distributed in the circumferential direction, the left side of the swing frame 112 is provided with a swing frame disc 112.2 and a fifth pointer 112.3, the upper side of the swing frame disc is provided with a sixth pointer 112.1, the upper side of the swing frame disc 112.2 is uniformly distributed with three arc-shaped holes in the circumferential direction, the swing frame disc 112.2 and the lower dial 113.2 can form a revolute pair and can be locked by three fifth screws 114, the rotating angle of the swing frame 112 relative to the horizontal swing rod 113 can be indicated on the fifth scale by the fifth pointer 112.3, the upper end of the swing head 116 is of a semicircular plate structure, the semicircular plate structure is provided with the sixth scale 116.1 and the arc-shaped holes, the semicircular plate structure and the right side of the swing frame 112 form a revolute pair, the sixth screw 111 passes through the arc-shaped holes on the semicircular plate structure and then forms a threaded pair with the swing frame 112, the sixth screw, the rotation angle of the swing head 116 relative to the swing frame 112 can be indicated on the sixth scale 116.1 by the sixth pointer 112.1, the lower end of the swing head 116 is provided with a threaded rod 116.2 for connecting the expansion device, and the nut 115 and the threaded rod 116.2 form a thread pair for locking the expansion device.

As shown in fig. 7 to 15, four guide bars 201.1 are uniformly distributed at the right end of the housing 201 in the circumferential direction, a fine movement slider 201.4 and a fine movement scale 201.5 are arranged at the upper side, a transverse groove 201.2 and a gear scale 201.3 are arranged at the side, five ejecting balls 227 are arranged at the upper side of the transverse groove 201.2, each ejecting ball 227 corresponds to a gear of manual feeding and is used for realizing accurate positioning of the sliding frame 217, four guide rails are horizontally arranged at two inner side walls, the rear cover 215 is fixedly installed at the left end of the housing 201 through screws, a threaded hole 215.1 is arranged on the rear cover 215, the threaded hole 215.1 and the threaded rod 116.2 form a threaded pair and are locked through a nut 115 to form a double-nut anti-loose structure, so that the fastening connection of the trimming head mechanism 2 and the tail end of the positioning frame mechanism 1 is realized, the hand wheel 216 is installed at the upper side of the housing 201 and forms a rotation pair, the first bevel gear 214 is coaxially, the worm gear 204 is coaxially and tightly mounted at the left end of the rotating sleeve 205, the worm 202 is horizontally mounted in the shell 201 and forms a rotation pair, the worm 202 is meshed with the worm gear 204 to form a worm gear transmission structure, and the fourth bevel gear 203 is coaxially and tightly mounted at the left end of the worm 202.

The right end of the rotating sleeve 205 is provided with an internal thread structure, four guide grooves 209.2 and an external thread structure are uniformly distributed on the outer side surface of the threaded shaft 209 in the circumferential direction, the four guide grooves 209.2 are matched and installed with four guide strips 201.1 at the right end of the shell 201, so that the threaded shaft 209 and the shell 201 form a moving pair, the external thread structure on the outer side surface of the threaded shaft 209 is matched and installed with the internal thread structure at the right end of the rotating sleeve 205 to form a thread pair, and when the rotating sleeve 205 rotates clockwise, the threaded shaft 209 can move.

The right end of the threaded shaft 209 is provided with an internal spline 209.1, the left end of the movable shaft 208 is provided with an external spline which is matched with the internal spline 209.1, so that the movable shaft 208 and the threaded shaft 209 form a moving pair, the thermal deformation piece 206 is coaxially arranged inside the threaded shaft 209, the left end of the thermal deformation piece is fixedly connected with the left end inside the threaded shaft 209 through a nut, the right end of the thermal deformation piece 206 is fixedly connected with the movable shaft 208 through threads, and the high-frequency electromagnetic induction coil 207 is arranged between the thermal deformation piece 206 and the threaded shaft 209 and is used for heating the thermal deformation piece 206; the sanding head 223.2 is tightly connected with the output shaft of the motor 223 through a clamping piece 223.1, and the motor 223 is fixedly arranged at the right end of the movable shaft 208.

The first gear tower 212 is provided with a five-layer gear structure, the reference circle diameters of the five-layer gear structure are in an arithmetic progression and form five gears, the first gear tower 212 is obliquely arranged in the shell 201 and forms a revolute pair, the big end is towards the left and the small end is towards the right, the second bevel gear 213 is coaxially and fixedly connected with the left end of the first gear tower 212, the second bevel gear 213 and the first bevel gear 214 form gear mesh transmission, the parameters of a five-layer gear structure arranged on the second gear tower 211 are the same as those of the five-layer gear structure on the first gear tower 212, the second gear tower 211 is obliquely arranged in the shell 201 and forms a revolute pair, and the large end is right and the small end is left, the second gear tower 211 is located above the first gear tower 212, the central axes of the third bevel gear 210 and the fourth bevel gear 203 are parallel to each other, the third bevel gear 210 is coaxially and fixedly connected with the right end of the second gear tower 211, and the third bevel gear 210 and the fourth bevel gear 203 form gear meshing transmission.

The sliding frame 217 is arranged inside the shell 201, the right end of the sliding frame 217 is positioned in the transverse groove 201.2, two sliding block structures arranged at the left end and two sliding block structures arranged at the right end of the sliding frame 217 are respectively matched and arranged with four guide rails on two side walls inside the shell 201, so that the sliding frame 217 and the shell 201 form a moving pair, the sliding frame 217 is provided with a round hole 217.1 and a long groove hole 217.2 at the position close to the middle, the right end of the sliding frame 217 is provided with a gear pointer 217.3 and a positioning hole 217.4, the second retaining rod 222 is arranged in the round hole 217.1 to form a rotating pair, two transmission auxiliary gears 222.1 are respectively coaxially and fixedly arranged at two ends of the second retaining rod 222, the first retaining rod 224 can slide in the long groove hole 217.2, the driving gear 225 is positioned at the lower side between the first retaining rod 224 and the second retaining rod 222, the two driving auxiliary gears 225.1 are respectively coaxially and fixedly arranged, and both ends of the driving gear 225 are also rotatably connected with the second holding rod 222 through two holding pieces 226, so that the driving pinion 225.1 is always meshed with the transmission pinion 222.1, an annular groove is arranged in the middle position of the driven gear 221 to prevent interference with the driving gear 225 when the feeding gear is changed, the driven gear 221 is positioned on the upper side between the first holding rod 224 and the second holding rod 222, the two driven pinions 221.1 are coaxially and fixedly installed at both ends of the driven gear 221 respectively, both ends of the driven gear 221 are rotatably connected with the first holding rod 224 through the two holding pieces 226, and both ends of the driven gear 221 are also rotatably connected with the second holding rod 222 through the two holding pieces 226, so that the driven pinion 221.1 is always meshed with the transmission pinion 222.1.

The left end of the pull rod 220 and the first holding rod 224 form a rotating pair, a spring 218 is arranged between the left end of the pull rod 220 and the right side of the sliding frame 217, the right end of the pull rod 220 and the upper end of the shift rod 219 form a rotating pair, and the lower end of the shift rod 219 is provided with a cross rod structure convenient for holding by hand.

In the initial state, the driving lever 219 is in the vertical state, the pulling rod 220 moves to the left by the elastic force of the spring 218, so that the first holding rod 224 slides to the left in the slotted hole 217.2, and under the pushing force of the eight holding pieces 226, the driving gear 225 moves downward and engages with one gear of the first gear tower 212, and the driven gear 221 moves upward and engages with a corresponding one gear of the second gear tower 211.

The motor 223 can drive the grinding head 223.2 to rotate, so that the surface of the die can be modified.

The clamping piece 223.1 can be used for tightly connecting the polishing head 223.2 with the output shaft of the motor 223, and after the clamping piece 223.1 is loosened, the polishing head 223.2 can be taken down and other types of polishing heads can be replaced according to the material and the surface characteristics of the die.

When the surface of the mold is repaired, firstly, the height of the sliding sleeve 103 in the positioning frame mechanism 1 and the rotation amount of each joint need to be adjusted, so that the polishing head 223.2 is aligned to the position of the surface of the mold, which needs to be corrected, and then the polishing head 223.2 is fed forwards, so that the repair of the surface of the mold is gradually completed.

The idle stroke or the rough machining of the surface of the die can adopt manual feeding: after the hand wheel 216 is rotated clockwise, the first bevel gear 214 drives the first gear tower 212 to rotate clockwise through the second bevel gear 213, the first gear tower 212 drives the driving gear 225 to rotate anticlockwise through gear meshing, so that the driving pinion 225.1 rotating anticlockwise drives the driven pinion 221.1 to rotate anticlockwise through the gear meshing relationship between the driving pinion 222.1 and the driven pinion 221.1, the driven pinion 221.1 drives the second gear tower 211 and the third bevel gear 210 to rotate clockwise through the gear meshing relationship between the driven gear 221 and the second gear tower 211, the third bevel gear 210 drives the fourth bevel gear 203 and the worm 202 to rotate clockwise, the worm 202 drives the worm wheel 204 and the rotating sleeve 205 to rotate clockwise, and under the transmission action of the thread pair, the moving shaft 208 moves rightwards, so that the polishing head 223.2 moves rightwards; the backward movement of the sanding head 223.2 is achieved by turning the hand wheel 216 counterclockwise.

When the transmission ratio needs to be increased to slow down the feeding speed, the shift lever 219 is pulled upwards to a horizontal state, in the process, the pull rod 220 pulls the first retaining rod 224 to move rightwards, under the pulling force of the eight retaining sheets 226, the driving gear 225 moves upwards and is disengaged from the gear on the first gear tower 212, the driven gear 221 moves downwards and is disengaged from the gear on the second gear tower 211, then the shift lever 219 moves rightwards to a proper gear position, the top ball 227 is clamped into the positioning hole 217.4 to accurately position the sliding frame 217, the shift lever 219 is pulled downwards to a vertical state, the driving gear 225 is engaged with the smaller gear on the first gear tower 212, the driven gear 221 is engaged with the larger gear on the second gear tower 211, and therefore the transmission ratio between the first gear tower 212 and the second gear tower 211 is increased, the feed speed of the sanding head 223.2 is slowed down; conversely, moving the position of the shift rod 219 to the left, the transmission ratio may be decreased to increase the feed speed of the sanding head 223.2.

Thermal stress feed may be used for fine trimming of the die surface: when the micro-motion sliding block 201.4 slides rightwards, the high-frequency electromagnetic induction coil 207 is electrified, the thermal deformation piece 206 is heated according to the electromagnetic induction heating principle, the temperature of the thermal deformation piece is increased, the thermal deformation piece 206 is extended according to the physical properties of thermal expansion and cold contraction, the polishing head 223.2 is slightly fed, and the surface of the die is finely trimmed; the micro-feeding precision realized according to the heat effect can reach micron level, and the surface finishing of the high-precision die can be met.

After the temperature and the elongation of the thermal deformation member 206 are calibrated, the scales indicated by the micro-motion slider 201.4 on the micro-motion scales 201.5 can enable the high-frequency electromagnetic induction coil 207 to heat the thermal deformation member 206 to the corresponding temperature, so that the control of the micro-motion slider 201.4 on the thermal stress feeding amount is realized.

The references to "front", "back", "left", "right", etc., are to be construed as references to orientations or positional relationships based on the orientation or positional relationship shown in the drawings or as orientations and positional relationships conventionally found in use of the product of the present invention, and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Claims (4)

1. A polishing head for repairing a mold, hereinafter referred to as a trimming head mechanism (2), includes a housing (201), a worm (202), a fourth bevel gear (203), a worm wheel (204), a rotating sleeve (205), a thermal deformation member (206), a high-frequency electromagnetic induction coil (207), a moving shaft (208), a threaded shaft (209), a third bevel gear (210), a second gear tower (211), a first gear tower (212), a second bevel gear (213), a first bevel gear (214), a back cover (215), a hand wheel (216), a carriage (217), a spring (218), a shift lever (219), a pull lever (220), a driven gear (221), a driven pinion (221.1), a second holding lever (222), a transmission pinion (222.1), a motor (223), a clamping member (223.1), a polishing head (223.2), a first holding lever (224), a driving gear (225), a driving pinion (225.1), A holding sheet (226), a top bead (227), characterized in that: the shell (201) is a supporting main body, the motor (223) drives the polishing head (223.2) to rotate through the clamping piece (223.1) to finish the surface of the die, the polishing head (223.2) can be fed and retreated through rotating the hand wheel (216) during manual feeding, the manual feeding has five gears, and the manual feeding can be used for idle stroke movement of the polishing head (223.2) and rough machining of the surface of the die, so that the repairing efficiency is improved; the micromotion sliding block (201.4) can be pushed rightwards when thermal stress feeds, the thermal deformation piece (206) is heated through the high-frequency electromagnetic induction coil (207), the microfeeding of the polishing head (223.2) is realized according to the principle of thermal expansion and cold contraction, the thermal stress can be adopted to feed when the surface of the die is finely trimmed, and the machining quality of the surface of the die is improved.

2. A sanding head for mold restoration as defined in claim 1 wherein: four guide bars (201.1) are uniformly distributed at the right end of the shell (201) in the circumferential direction, a micro-motion slider (201.4) and a micro-motion scale (201.5) are arranged at the upper side, a transverse groove (201.2) and a gear scale (201.3) are arranged at the side, five top beads (227) are arranged at the upper side of the transverse groove (201.2), each top bead (227) corresponds to one gear of manual feeding and is used for realizing accurate positioning of a sliding frame (217), four guide rails are horizontally arranged on two side walls inside the transverse groove, a rear cover (215) is fixedly arranged at the left end of the shell (201) through screws, a threaded hole (215.1) is arranged on the rear cover (215), a hand wheel (216) is arranged at the upper side of the shell (201) and forms a revolute pair, a first bevel gear (214) is coaxially and fixedly connected with the lower end of the hand wheel (216), a rotary sleeve (205) is arranged inside the shell (201) and forms a revolute, the worm (202) is horizontally arranged in the shell (201) to form a rotation pair, the worm (202) is meshed with the worm wheel (204) to form a worm and gear transmission structure, and the fourth bevel gear (203) is coaxially and tightly arranged at the left end of the worm (202);

an internal thread structure is arranged at the right end of the rotating sleeve (205), four guide grooves (209.2) and an external thread structure are uniformly distributed on the outer side surface of the threaded shaft (209) in the circumferential direction, the four guide grooves (209.2) are matched and installed with four guide strips (201.1) at the right end of the shell (201), so that the threaded shaft (209) and the shell (201) form a moving pair, the external thread structure on the outer side surface of the threaded shaft (209) is matched and installed with the internal thread structure at the right end of the rotating sleeve (205) to form a thread pair, and when the rotating sleeve (205) rotates clockwise, the threaded shaft (209) can move rightwards;

the right end of the threaded shaft (209) is provided with an internal spline (209.1), an external spline arranged at the left end of the movable shaft (208) is matched and installed with the internal spline (209.1), so that the movable shaft (208) and the threaded shaft (209) form a moving pair, the thermal deformation piece (206) is coaxially installed inside the threaded shaft (209), the left end of the thermal deformation piece and the left end inside the threaded shaft (209) are fastened and connected through a nut, the right end of the thermal deformation piece (206) and the movable shaft (208) are fastened and connected through threads, and the high-frequency electromagnetic induction coil (207) is installed between the thermal deformation piece (206) and the threaded shaft (209) and used for heating the thermal deformation piece (206); the sanding head (223.2) is tightly connected with an output shaft of the motor (223) through a clamping piece (223.1), and the motor (223) is fixedly arranged at the right end of the movable shaft (208).

3. A sanding head for mold restoration as defined in claim 1 wherein: the first gear tower (212) is provided with a five-layer gear structure, the reference circle diameters of the five-layer gear structure are in an equal-difference number series and form five gears, the first gear tower (212) is obliquely arranged in the shell (201) and forms a revolute pair, the large end of the first gear tower is towards the left and the small end of the first gear tower is towards the right, the second gear (213) is coaxially and fixedly connected with the left end of the first gear tower (212), the second gear (213) and the first bevel gear (214) form gear meshing transmission, the parameters of the five-layer gear structure arranged on the second gear tower (211) are the same as those of the five-layer gear structure on the first gear tower (212), the second gear tower (211) is obliquely arranged in the shell (201) and forms a revolute pair, the large end of the second gear tower (211) is towards the right and the small end of the first gear tower (212), the central axes of the second gear tower (211) are parallel, the third bevel gear (210) is coaxially and, the third bevel gear (210) and the fourth bevel gear (203) form gear meshing transmission;

the sliding frame (217) is arranged inside the shell (201), the right end of the sliding frame is positioned in the transverse groove (201.2), two sliding block structures arranged at the left end of the sliding frame (217) and two sliding block structures arranged at the right end of the sliding frame (217) are respectively matched and arranged with four guide rails on two side walls inside the shell (201), so that the sliding frame (217) and the shell (201) form a moving pair, a round hole (217.1) and a long groove hole (217.2) are arranged at the position, close to the middle, of the sliding frame (217), a gear pointer (217.3) and a positioning hole (217.4) are arranged at the right end of the sliding frame, the second retaining rod (222) is arranged in the round hole (217.1) to form a rotating pair, two transmission auxiliary gears (222.1) are respectively and coaxially and fixedly arranged at two ends of the second retaining rod (222), the first retaining rod (224) can slide in the long groove hole (217.2), the driving gear (225) is positioned at the lower side between the first retaining rod (224) and the second retaining, two ends of a driving gear (225) are rotatably connected with a first holding rod (224) through two holding pieces (226), two ends of the driving gear (225) are further rotatably connected with a second holding rod (222) through the two holding pieces (226), so that a driving pinion (225.1) is always meshed with a transmission pinion (222.1), an annular groove is formed in the middle of a driven gear (221) to prevent interference with the driving gear (225) when a feeding gear is changed, the driven gear (221) is located on the upper side between the first holding rod (224) and the second holding rod (222), the two driven pinions (221.1) are respectively and coaxially and fixedly installed at two ends of the driven gear (221), two ends of the driven gear (221) are rotatably connected with the first holding rod (224) through the two holding pieces (226), and two ends of the driven gear (221) are further rotatably connected with the second holding rod (222) through the two holding pieces (226), the driven pinion (221.1) is always meshed with the transmission pinion (222.1);

the left end of the pull rod (220) and the first holding rod (224) form a rotating pair, a spring (218) is arranged between the left end of the pull rod (220) and the right side of the sliding frame (217), the right end of the pull rod (220) and the upper end of the shift lever (219) form a rotating pair, and the lower end of the shift lever (219) is provided with a cross rod structure convenient for holding;

in the initial state, the shifting rod (219) is in a vertical state, the pull rod (220) moves leftwards under the elastic force of the spring (218), so that the first retaining rod (224) slides leftwards in the slotted hole (217.2), under the thrust action of the eight retaining pieces (226), the driving gear (225) moves downwards and is meshed with one gear of the first gear tower (212), and the driven gear (221) moves upwards and is meshed with a corresponding gear of the second gear tower (211).

4. A sanding head for mold restoration as defined in claim 1 wherein: the motor (223) can drive the polishing head (223.2) to rotate, so that the surface of the die can be trimmed;

the clamping piece (223.1) can be used for tightly connecting the polishing head (223.2) with an output shaft of the motor (223), the polishing head (223.2) can be taken down after the clamping piece (223.1) is unscrewed, and other types of polishing heads can be replaced according to the material and surface characteristics of the die;

the idle stroke or the rough machining of the surface of the die can adopt manual feeding: after a hand wheel (216) is rotated clockwise, a first bevel gear (214) drives a first gear tower (212) to rotate clockwise through a second bevel gear (213), the first gear tower (212) drives a driving gear (225) to rotate anticlockwise through gear meshing, so that a driving pinion (225.1) rotating anticlockwise drives a driven pinion (221.1) to rotate anticlockwise through the gear meshing relationship between the driving pinion (222.1) and the driven pinion (221.1), the driven pinion (221.1) drives a second gear tower (211) and a third bevel gear (210) to rotate clockwise through the gear meshing relationship between the driven gear (221) and a second gear tower (211), the third bevel gear (210) drives a fourth bevel gear (203) and a worm (202) to rotate clockwise, the worm (202) drives a worm wheel (204) and a rotating sleeve (205) to rotate clockwise, and under the transmission effect of a thread pair, the moving shaft (208) moves rightwards, so that the polishing head (223.2) moves rightwards and feeds; the backward movement of the polishing head (223.2) can be realized by rotating the hand wheel (216) anticlockwise;

the manual feeding has five gears which can be indicated on a gear scale (201.3) by a gear pointer (217.3), when the transmission ratio needs to be increased to slow down the feeding speed, the shifting rod (219) is firstly pulled upwards to be in a horizontal state, in the process, the pull rod (220) pulls the first retaining rod (224) to move rightwards, under the pulling force of eight retaining pieces (226), the driving gear (225) moves upwards and is disengaged from the gear on the first gear tower (212), the driven gear (221) moves downwards and is disengaged from the gear on the second gear tower (211), then the shifting rod (219) moves rightwards to be in a proper gear, the top ball (227) is clamped into the positioning hole (217.4) to accurately position the sliding frame (217), the shifting rod (219) is pulled downwards to be in a vertical state, and the driving gear (225) is engaged with the smaller gear on the first gear tower (212), the driven gear (221) is meshed with a larger gear on the second gear tower (211), so that the transmission ratio between the first gear tower (212) and the second gear tower (211) is increased, and the feeding speed of the polishing head (223.2) is reduced; conversely, moving the position of the shift lever (219) to the left, the transmission ratio can be reduced to increase the feed speed of the sanding head (223.2);

thermal stress feed may be used for fine trimming of the die surface: the micro-motion sliding block (201.4) slides rightwards, the high-frequency electromagnetic induction coil (207) is electrified, the thermal deformation piece (206) is heated according to the electromagnetic induction heating principle, the temperature of the thermal deformation piece is increased, and the thermal deformation piece (206) is extended according to the physical properties of thermal expansion and cold contraction, so that the polishing head (223.2) is fed in a micro-scale mode, and the surface of the die is finely trimmed; the micro-feeding precision realized according to the thermal effect can reach micron level, and the surface finishing of a high-precision die can be met;

after the temperature and the elongation of the thermal deformation piece (206) are calibrated, the scales indicated by the micro-motion slide block (201.4) on the micro-motion scale (201.5) can enable the high-frequency electromagnetic induction coil (207) to heat the thermal deformation piece (206) to the corresponding temperature, and therefore the control of the micro-motion slide block (201.4) on the thermal stress feeding amount is achieved.

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