CN107552885B - Full-automatic numerical control double-end chamfering machine - Google Patents
Full-automatic numerical control double-end chamfering machine Download PDFInfo
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- CN107552885B CN107552885B CN201710857969.4A CN201710857969A CN107552885B CN 107552885 B CN107552885 B CN 107552885B CN 201710857969 A CN201710857969 A CN 201710857969A CN 107552885 B CN107552885 B CN 107552885B
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Abstract
The invention discloses a full-automatic numerical control double-head chamfering machine, which comprises a lathe bed, clamping mechanisms arranged on the lathe bed and used for clamping cylindrical workpieces, two chamfering mechanisms symmetrically arranged on two sides of the clamping mechanisms and respectively used for chamfering the cylindrical workpieces clamped on the clamping mechanisms, and a mechanical transmission mechanism used for transferring the cylindrical workpieces to the clamping mechanisms. According to the full-automatic numerical control double-end chamfering machine, through reasonable structural arrangement, when the full-automatic numerical control double-end chamfering machine is used for smashing work, the cylindrical workpiece is clamped and positioned through the first clamping piece and the second clamping piece on the clamping mechanism, and then the double ends of the cylindrical workpiece are subjected to chamfering processing through the two chamfering processing mechanisms respectively, so that full automation of chamfering on the double ends of the cylindrical workpiece is realized, the working efficiency is high, the chamfering precision on the cylindrical workpiece is high, the stability is good, and the use requirement of enterprises on chamfering on the double ends of the cylindrical workpiece is met.
Description
Technical Field
The invention belongs to the technical field of mechanical equipment manufacturing, and particularly relates to a full-automatic numerical control double-head chamfering machine.
Background
The chamfering machine is a small-sized precision machine tool which is specially used for manufacturing dies, hardware machines, machine tool manufacturing, hydraulic parts, valve manufacturing, chamfering of textile machines, deburring, milling, planing and other processing products. It will be appreciated that there are chamfering operations that are used to chamfer the ends of a metal workpiece during its production and preparation, depending on the desired structural characteristics of the metal workpiece.
At present, among the prior art carry out the beveler of chamfer to the double-end of tubular workpiece (like sleeve, bearing), it is mostly the beveler of single-end chamfer, like this carry out the chamfer processing to the tubular workpiece in-process, need adopt two bevelers to set up side by side, perhaps adopt a beveler to carry out the mode of handling in proper order, its degree of automation is low, the production efficiency who corresponds is not high, and carry out the chamfer precision low of chamfer to the double-end of tubular workpiece, can not satisfy the user demand of enterprise to tubular workpiece double-end chamfer well.
Disclosure of Invention
The invention aims to provide a full-automatic numerical control double-head chamfering machine for solving the technical problems.
A full-automatic numerical control double-head chamfering machine, which is used for chamfering the double heads of a cylindrical workpiece; the method is characterized in that: the chamfering machine comprises a lathe bed, clamping mechanisms, two chamfering processing mechanisms and a mechanical transmission mechanism, wherein the clamping mechanisms are arranged on the lathe bed and used for clamping cylindrical workpieces, the two chamfering processing mechanisms are symmetrically arranged on two sides of the clamping mechanisms and are respectively used for chamfering the cylindrical workpieces clamped on the clamping mechanisms, and the mechanical transmission mechanism is used for transferring the cylindrical workpieces to the clamping mechanisms; wherein,
The clamping mechanism comprises a first clamping piece fixed on the lathe bed, and a second clamping piece arranged opposite to the first clamping piece, wherein both clamping surfaces of the first clamping piece and the second clamping piece are used for matching with the arc surface of the cylindrical workpiece, and the second clamping piece is arranged on the lathe bed through a linear sliding table and can move back and forth relative to the first clamping piece;
The chamfering mechanism comprises a cutter disc for chamfering the cylindrical workpiece, a rotary driving assembly for driving the cutter disc to rotate and a linear driving assembly for driving the cutter disc to move back and forth relative to the clamping mechanism;
The mechanical transmission mechanism comprises a pneumatic clamping jaw, a vertical driving assembly and a horizontal driving assembly, wherein the vertical driving assembly is used for driving the pneumatic clamping jaw to move back and forth in the vertical direction, and the horizontal driving assembly is used for driving the pneumatic clamping jaw to move back and forth in the horizontal direction, and the vertical driving assembly is arranged on a horizontal moving part in the horizontal driving assembly so as to drive the vertical driving assembly and the pneumatic clamping jaw to move in the horizontal direction by the horizontal driving assembly.
In a preferred embodiment of the invention, the second clamping element is connected to its clamping surface by means of an elastic element to a pin which projects outwards relative to the clamping surface of the second clamping element and which can be retracted into the clamping surface of the second clamping element by means of an elastic element being pressed.
As a preferable scheme of the invention, the second clamping piece is provided with a groove on the clamping surface, and an assembly hole is arranged in the groove for assembling the elastic piece and the pin.
As a preferable mode of the invention, the first clamping piece and the second clamping piece are respectively provided with chamfers at two side ends of the clamping surface.
As a preferable scheme of the invention, the rotary driving assembly comprises a rotary mounting seat, one end of the rotary mounting seat is fixedly assembled with the cutterhead, and the other end of the rotary mounting seat is connected with a rotating shaft part of the motor through a triangular belt.
As a preferable scheme of the invention, the linear driving assembly comprises a sliding rail fixed on the lathe bed, a sliding block arranged on the sliding rail, a servo motor and a ball screw, wherein the servo motor and the ball screw are used for driving the sliding block to move back and forth on the sliding rail, the sliding block and the ball screw are connected in a threaded mode, and the rotary driving assembly is fixedly arranged on the sliding block.
As a preferable scheme of the invention, the cutter head is provided with three cutter heads for respectively processing the inner side, the outer side and the end face of the head of the cylindrical workpiece to chamfer.
As a preferred embodiment of the invention, the bed body is provided with a feed chute for feeding the cylindrical workpiece on the second clamping member, and the feed chute is arranged obliquely downwards relative to the bed body.
As a preferable scheme of the invention, the lathe bed is provided with a first scraps separating mechanism, and the first scraps separating mechanism comprises a baffle plate arranged between a first clamping piece and a second clamping piece and a turnover driving assembly for driving the baffle plate to turn over; the baffle is arranged on the lathe bed through a rotating shaft; the overturning driving assembly comprises an air cylinder, a cam is arranged on a telescopic rod of the air cylinder, and the cam is sleeved on a rotating shaft of the baffle and fixedly connected relative to the rotating shaft.
As a preferable scheme of the invention, the lathe bed is provided with a second scraps separating mechanism, the second scraps separating mechanism comprises a material receiving inclined frame and a discharging baffle plate arranged above the material receiving inclined frame, and a flexible cover with a forked end part is fixed on one side of the discharging baffle plate facing the material receiving inclined frame.
Due to the application of the technical scheme, the invention has the following beneficial effects:
According to the full-automatic numerical control double-head chamfering machine, through reasonable structural arrangement, when the full-automatic numerical control double-head chamfering machine is used for smashing work, the cylindrical workpiece is clamped and positioned through the first clamping piece and the second clamping piece on the clamping mechanism, and then the double heads of the cylindrical workpiece are subjected to chamfering processing through the two chamfering processing mechanisms respectively, so that full automation of chamfering on the double heads of the cylindrical workpiece is realized, the working efficiency is high, the chamfering precision of the cylindrical workpiece is high, the stability is good, and the use requirements of enterprises on chamfering on the double heads of the cylindrical workpiece are met.
Drawings
Fig. 1 is a schematic structural view of a full-automatic numerical control double-head chamfering machine.
Fig. 2 is a schematic structural view of a rotary driving assembly according to the present invention.
Fig. 3 is a schematic structural view of a first scrap separating mechanism in the present invention.
Fig. 4 is a schematic structural view of a second chip separating mechanism according to the present invention.
Wherein, 100, the lathe bed; 200. a clamping mechanism; 201. a first clamping member; 202. a second clamping member; 2021. a pin; 2022. a strip groove; 300. chamfering processing mechanism; 301. a cutterhead; 302. a rotary drive assembly; 303. a linear drive assembly; 3021. rotating the mounting base; 3022. a V-belt; 3023. a motor; 3033. a servo motor; 3034. a ball screw; 400. a mechanical transmission mechanism; 401. pneumatic clamping jaws; 402. a vertical drive assembly; 403. a horizontal drive assembly; 501. a baffle; 502. a rotation shaft; 503. a cylinder; 504. a cam; 601. receiving a material inclined frame; 602. a discharging baffle; 603. a flexible cover.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the full-automatic numerically-controlled double-head chamfering machine provided by the preferred embodiment of the invention is specifically used for chamfering the double heads of a cylindrical workpiece, and it can be understood that the cylindrical workpiece can be a sleeve, a bearing or other components in practice.
The full-automatic numerical control double-head chamfering machine comprises a lathe bed 100, a clamping mechanism 200 which is arranged on the lathe bed 100 and used for clamping and positioning a cylindrical workpiece, two chamfering processing mechanisms 300 which are symmetrically arranged on two sides of the clamping mechanism 200 and respectively used for chamfering the cylindrical workpiece clamped on the clamping mechanism 200, and a mechanical transmission mechanism 400 which is used for transferring the cylindrical workpiece to the clamping mechanism 200. In this embodiment, the lathe bed 100 is further provided with a first chip separating mechanism and a second chip separating mechanism for separating the machined cylindrical workpiece and the chip.
The clamping mechanism 200 includes a first clamping member 201 fixed on the machine body 100, and a second clamping member 202 disposed opposite to the first clamping member 201, where two clamping surfaces of the first clamping member 201 and the second clamping member 202 are respectively configured to match with an arc surface of the cylindrical workpiece, so that the clamping mechanism 200 is used to clamp and position the cylindrical workpiece by tight fit between the two clamping surfaces of the first clamping member 201 and the second clamping member 202 and the cylindrical workpiece.
The second clamping member 202 is specifically disposed on the machine tool 100 through a linear sliding table (not shown), and can move back and forth relative to the machine tool 100; the first clamping piece 201 is fixedly assembled on the lathe bed 100, so that when the clamping mechanism 200 works, the clamping mechanism 200 can clamp and position the cylindrical workpiece to open and close by the relative movement of the second clamping piece 202 relative to the first clamping piece 201.
It can be appreciated that a driving portion (not shown) is further connected to the second clamping member 202 to move the second clamping member 202 back and forth on the machine tool body 100, and specifically the driving portion may be provided with an air cylinder, which drives the linear sliding table on the second clamping member 202 to move the second clamping member back and forth on the machine tool body 100 through the back and forth expansion and contraction of the telescopic rod on the air cylinder, so as to realize the clamping and positioning of the cylindrical workpiece by the clamping mechanism 200 during working and the falling effect of the cylindrical workpiece from the clamping mechanism 200 by using the gravity of the cylindrical workpiece.
In this embodiment, the second clamping member 202 has a pin 2021 attached to a clamping surface thereof by an elastic member (not shown), and the pin 2021 protrudes outward with respect to the clamping surface portion of the second clamping member 202, and the pin 2021 can be retracted into the clamping surface of the second clamping member 202 by pressing the elastic member. Wherein the elastic member is preferably a spring. When the second clamping piece 202 is matched with the first clamping piece 201 to clamp the cylindrical workpiece, the pin 2021 on the second clamping piece 202 plays a role of clamping and buffering so as to prevent the cylindrical workpiece from being clamped. For this purpose, in the embodiment, a groove 2022 is formed on the clamping surface of the second clamping member 202, and a mounting hole (not shown) is formed in the groove 2022 for mounting the elastic member and the pin 2021.
Further, the first clamping member 201 and the second clamping member 202 are provided with chamfers (not shown) at both side ends of the clamping surface thereof, respectively. So that when the first clamping piece 201 and the second clamping piece 202 clamp the cylindrical workpiece, the chamfer angles formed on the first clamping piece 201 and the second clamping piece 202 play a role in avoiding, and accordingly, the ends of the first clamping piece 201 and the second clamping piece 202 can be prevented from scratching the cylindrical workpiece.
The chamfering mechanism 300 is specifically configured to chamfer a cylindrical workpiece, and in this embodiment, the chamfering mechanisms 300 disposed on two sides of the clamping mechanism 200 are symmetrically disposed to chamfer one end of the cylindrical workpiece, so as to implement the dual-head chamfering function of the full-automatic numerical control dual-head chamfering machine on the cylindrical workpiece.
Each chamfering mechanism 300 comprises a cutter head 301 for chamfering a cylindrical workpiece, a rotary drive assembly 302 for driving the cutter head 301 to rotate, and a linear drive assembly 303 for driving the cutter head 301 to move back and forth relative to the clamping mechanism 200.
In this embodiment, three tool bits are disposed on the cutterhead 301 for chamfering the inner side, the outer side and the end face of the head of the cylindrical workpiece, which is driven by the need of chamfering the cylindrical workpiece by the full-automatic numerical control double-head chamfering machine, and in operation, the cutterhead 301 is driven to rotate at a high speed by the rotary driving assembly 302, and then the cutterhead 301 which rotates at a high speed is driven to approach the head of the cylindrical workpiece clamped in the clamping mechanism 200 by the linear driving assembly 303, and chamfering processing of the head of the cylindrical workpiece is completed.
Referring to fig. 2, the rotary driving assembly 302 includes a rotary mounting seat 3021, one end of which is fixedly assembled with the cutterhead 301, and the other end of which is connected with a rotating shaft portion of the motor 3023 through a triangle belt 3022. In this way, when the rotary driving assembly 302 is in operation, the rotary shaft portion of the motor 3023 rotates at a high speed, the rotary mounting seat 3021 is driven to rotate by the triangular belt 3022, and further high-speed rotary driving of the cutterhead 301 is achieved, it can be appreciated that in this embodiment, the triangular belt 3022 is used to connect the rotary shaft portion of the motor 3023 with the rotary mounting seat 3021, so that the cutterhead 301 rotating at a high speed does not swing during the chamfering process of cutting the head portion of the cylindrical workpiece, and further accuracy of chamfering the cylindrical workpiece by the chamfering mechanism 300 is ensured. Further, the motor 3023 of the present embodiment is specifically fixedly mounted on the rotation mount 3021.
The linear driving assembly 303 specifically includes a slide rail (not shown) fixed to the bed 100, a slider (not shown) disposed on the slide rail, and a servo motor 3033 and a ball screw 3034 for driving the slider to move back and forth on the slide rail, wherein the slider is threadedly connected with the ball screw 3034, and the rotary driving assembly 302 is fixedly disposed on the slider. In this way, when the linear driving assembly 303 is in operation, the servo motor 3033 drives the ball screw 3034 to rotate, and the threaded connection between the slider and the ball screw 3034 is utilized to realize the back and forth movement of the slider on the slide rail of the lathe bed 100, so as to realize the back and forth movement of the rotary driving assembly 302 relative to the clamping mechanism 200.
Wherein, the mechanical transmission mechanism 400 comprises a pneumatic clamping jaw 401, a vertical driving component 402 for driving the pneumatic clamping jaw 401 to move back and forth in the vertical direction, and a horizontal driving component 403 for driving the pneumatic clamping jaw 401 to move back and forth in the horizontal direction, wherein the vertical driving component 402 is arranged on a horizontal moving part in the horizontal driving component 403, so that the vertical driving component 402 and the pneumatic clamping jaw 401 are driven to move in the horizontal direction by the horizontal driving component 403.
In this embodiment, the pneumatic clamping jaw 401 is configured as a double-head moving clamping jaw structure, so that stability and precision of grabbing a cylindrical workpiece with the pneumatic clamping jaw 401 are improved. And the bed 100 is provided with a feed chute (not shown) for feeding the cylindrical workpiece on the second clamp 202, the feed chute being disposed obliquely downward with respect to the bed 100. The external cylindrical workpiece can specifically enter the working area of the pneumatic clamping jaw 401 from the feeding slideway, so that the pneumatic clamping jaw 401 can sequentially transfer the cylindrical workpiece to the clamping mechanism 200.
It should be further appreciated that the vertical driving component 402 may be configured as a transmission mechanism in which a ball screw and a nut are mutually matched, and the horizontal driving component 403 may be configured as a slide rail track driven by a cylinder, and the above structural features and the corresponding working principles are described herein, which are not described herein.
Referring to fig. 3, the first chip separating mechanism includes a baffle 501 disposed between the first clamping member 201 and the second clamping member 202, and a turning driving assembly for driving the baffle 501 to turn, where the baffle 501 is disposed on the bed 100 through a rotation shaft 502; the cylindrical workpiece processed by the chamfering mechanism 300 is separated from the second clamping member 202 and directly falls onto the baffle 501, and the scraps generated during processing of the cylindrical workpiece are generated by the direct contact between the cutter 301 rotating at high speed and the cylindrical workpiece and are scattered on the periphery of the baffle 501, so that the separation effect of the cylindrical workpiece and the scraps is realized.
Specifically, the overturning driving assembly comprises an air cylinder 503, a cam 504 is arranged on a telescopic rod of the air cylinder 503, and the cam 504 is sleeved on a rotating shaft 502 of the baffle 501 and fixedly connected relative to the rotating shaft 502. Thus, by utilizing the structural characteristics of the cam 504, when the air cylinder 503 works, the cam 504 can drive the rotating shaft 502 to rotate for a certain angle, so that the baffle 501 fixed on the rotating shaft 502 can be turned over for a certain angle, and the cylindrical workpiece accumulated on the baffle 501 can fall down along with the turning over of the baffle 501, in particular to the position where the second chip separating mechanism 600 is located.
It will be appreciated that the cylindrical workpiece after separation by the first chip separating mechanism 600 is inevitably doped with chips, and for this purpose, the present embodiment is specifically provided with a second chip separating mechanism to separate the cylindrical workpiece from the chips first.
Referring to fig. 4, the second chip separating mechanism includes a receiving inclined frame 601, and a discharge baffle 602 disposed above the receiving inclined frame 601, where a flexible cover 603 with end portions split is fixed on a side of the discharge baffle 602 facing the receiving inclined frame 601. The material receiving inclined frame 601 is obliquely arranged downwards relative to the ground, so that when the cylindrical workpiece is arranged on the material receiving inclined frame 601, the cylindrical workpiece slides downwards along the material receiving inclined frame 601 under the action of gravity component force, and scraps doped in the cylindrical workpiece are separated from the cylindrical workpiece under the blocking of the flexible cover 603, and further the effect of separating secondary scraps is realized.
In summary, through reasonable structural arrangement, when the full-automatic numerical control double-end chamfering machine is used for smashing, the cylindrical workpiece is clamped and positioned through the first clamping piece and the second clamping piece on the clamping mechanism, and then the double ends of the cylindrical workpiece are subjected to chamfering processing through the two chamfering processing mechanisms respectively, so that full automation of chamfering the double ends of the cylindrical workpiece is realized, the working efficiency is high, the chamfering precision of the cylindrical workpiece is high, the stability is good, and the use requirement of enterprises on double-end chamfering of the cylindrical workpiece is met.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (1)
1. A full-automatic numerical control double-head chamfering machine, which is used for chamfering the double heads of a cylindrical workpiece; the method is characterized in that: the chamfering machine comprises a lathe bed, clamping mechanisms, two chamfering processing mechanisms and a mechanical transmission mechanism, wherein the clamping mechanisms are arranged on the lathe bed and used for clamping cylindrical workpieces, the two chamfering processing mechanisms are symmetrically arranged on two sides of the clamping mechanisms and are respectively used for chamfering the cylindrical workpieces clamped on the clamping mechanisms, and the mechanical transmission mechanism is used for transferring the cylindrical workpieces to the clamping mechanisms; wherein,
The clamping mechanism comprises a first clamping piece fixed on the lathe bed, and a second clamping piece arranged opposite to the first clamping piece, wherein both clamping surfaces of the first clamping piece and the second clamping piece are used for matching with the arc surface of the cylindrical workpiece, and the second clamping piece is arranged on the lathe bed through a linear sliding table and can move back and forth relative to the first clamping piece;
The chamfering mechanism comprises a cutter disc for chamfering the cylindrical workpiece, a rotary driving assembly for driving the cutter disc to rotate and a linear driving assembly for driving the cutter disc to move back and forth relative to the clamping mechanism;
The mechanical transmission mechanism comprises a pneumatic clamping jaw, a vertical driving assembly and a horizontal driving assembly, wherein the vertical driving assembly is used for driving the pneumatic clamping jaw to move back and forth in the vertical direction, and the horizontal driving assembly is used for driving the pneumatic clamping jaw to move back and forth in the horizontal direction, and the vertical driving assembly is arranged on a horizontal moving part in the horizontal driving assembly so as to drive the vertical driving assembly and the pneumatic clamping jaw to move in the horizontal direction by the horizontal driving assembly;
The second clamping piece is connected with a pin on the clamping surface of the second clamping piece through an elastic piece, the pin protrudes outwards relative to the clamping surface part of the second clamping piece, and the pin can be retracted into the clamping surface of the second clamping piece through extrusion of the elastic piece;
The second clamping piece is provided with a groove on the clamping surface, and an assembly hole is formed in the groove and used for assembling the elastic piece and the pin;
The two side ends of the clamping surface of the first clamping piece and the second clamping piece are respectively provided with a chamfer;
Three tool bits are arranged on the cutterhead and used for respectively processing the inner side, the outer side and the end face of the head of the cylindrical workpiece to chamfer;
The lathe bed is provided with a first scraps separation mechanism, and the first scraps separation mechanism comprises a baffle plate arranged between a first clamping piece and a second clamping piece and a turnover driving assembly for driving the baffle plate to turn over; the baffle is arranged on the lathe bed through a rotating shaft; the overturning driving assembly comprises an air cylinder, a cam is arranged on a telescopic rod of the air cylinder, and the cam is sleeved on a rotating shaft of the baffle plate and fixedly connected relative to the rotating shaft;
The lathe bed is provided with a second scraps separating mechanism, the second scraps separating mechanism comprises a material receiving inclined frame and a discharging baffle plate arranged above the material receiving inclined frame, and a flexible cover with a forked end part is fixed on one side of the discharging baffle plate facing the material receiving inclined frame;
the rotary driving assembly comprises a rotary mounting seat, one end of the rotary mounting seat is fixedly assembled with the cutterhead, and the other end of the rotary mounting seat is connected with a rotating shaft part of the motor through a triangular belt;
The linear driving assembly comprises a sliding rail fixed on the lathe bed, a sliding block arranged on the sliding rail, a servo motor and a ball screw, wherein the servo motor and the ball screw are used for driving the sliding block to move back and forth on the sliding rail, the sliding block is connected with the ball screw in a threaded mode, and the rotary driving assembly is fixedly arranged on the sliding block;
The second clamping piece is provided with a feeding slideway for feeding the cylindrical workpiece, and the feeding slideway is obliquely arranged downwards relative to the lathe bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710857969.4A CN107552885B (en) | 2017-09-21 | 2017-09-21 | Full-automatic numerical control double-end chamfering machine |
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| CN201710857969.4A CN107552885B (en) | 2017-09-21 | 2017-09-21 | Full-automatic numerical control double-end chamfering machine |
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| CN107552885A CN107552885A (en) | 2018-01-09 |
| CN107552885B true CN107552885B (en) | 2024-06-21 |
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| CN108515240A (en) * | 2018-04-28 | 2018-09-11 | 鹏驰五金制品有限公司 | A kind of hexagonal head wrench tool both ends chamfer machining equipment |
| CN109290602B (en) * | 2018-09-06 | 2024-06-21 | 东莞理工学院 | A CNC slide rail side hole chamfering machine |
| CN109530814B (en) * | 2019-01-17 | 2024-06-21 | 宁波宏科汽车部件有限公司 | Double-end chamfering device |
| CN109604729A (en) * | 2019-01-17 | 2019-04-12 | 宁波宏科汽车部件有限公司 | An automatic chamfering device |
| CN112620803A (en) * | 2020-12-07 | 2021-04-09 | 重庆惠申橡塑有限公司 | Automatic chamfering machine |
| CN112872846B (en) * | 2021-03-24 | 2024-08-13 | 苏州锦美川自动化科技有限公司 | Bilateral fixed length chamfering equipment for production of water pump motor cylinder |
| CN117047846A (en) * | 2023-07-28 | 2023-11-14 | 芜湖富春染织股份有限公司 | Automatic chamfering equipment for cheese |
| CN116967784A (en) * | 2023-08-28 | 2023-10-31 | 浙江方成工具有限公司 | Drill bit processing equipment |
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