CN1947936A - Lapping machine - Google Patents
Lapping machine Download PDFInfo
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- CN1947936A CN1947936A CN 200610097387 CN200610097387A CN1947936A CN 1947936 A CN1947936 A CN 1947936A CN 200610097387 CN200610097387 CN 200610097387 CN 200610097387 A CN200610097387 A CN 200610097387A CN 1947936 A CN1947936 A CN 1947936A
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Abstract
A grinding machine for grinding the wire-drawing die has a grinding head module with grinding needle and its fixture, a die feeding unit with die feeding motor and die pushing plate, a die clamping and advancing unit with a clamp, and a supporter advancing unit. Said grinding needle is driven by an eccentric axle for vibrating up and down.
Description
Technical field
The present invention relates to a kind of grinder that is used to grind the module endoporus, especially for the grinder that grinds wire drawing die sizing area and compressional zone.
Background technology
The workpiece particularly endoporus of wire drawing die is made up of two parts, and the one, cylindrical hole, another is a round taper hole, its requirement on machining accuracy is very high, the tolerance of physical dimension is the some thousandths of millimeter, and surface smoothness requires high, and the coherence request of producing in batches is also very harsh.The bistrique part of conventional grinder is rotated at a high speed by card grinding driven by motor card grinding chuck and card grinding, and hand rest wire drawing die body grinds.This processing method not only speed is slow, and can not ensure the quality of products.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of and can send mould automatically and clamp the grinder that feeds, adopt this grinder to improve grinding rate greatly, and guaranteed Grinding Quality, improved the yield rate of module.
Technical scheme of the present invention is as follows: a kind of grinder, it comprises the grinding head assembly that module is ground, be provided with card grinding chuck and card grinding in the grinding head assembly, send die device and device for clamping and advancing work pieces machined, a side of sending die device to be positioned at device for clamping and advancing work pieces machined is sent to be provided with in the die device and is sent the mould motor and push away template, is provided with binding clasp in the device for clamping and advancing work pieces machined, the described template that pushes away pushes to module in the binding clasp under sending the effect of mould motor, card grinding be positioned at binding clasp directly over.
Described sending also is provided with support, dress mould tube, swinging axle, rocking arm and connecting rod in the die device, dress mould tube vertically is fixed on the support, push away the below that template stretches in the support and is in dress mould tube, swinging axle is installed in by bearing and grinds on the body frame, swinging axle upper end with push away template and be connected, the lower end is connected with rocking arm, and rocking arm links to each other with the sheave that send the mould motor by connecting rod; Described support is provided with notch, pushes away template and stretches out from notch under sending the effect of mould motor, pushes away template and is provided with kidney slot, and the width of kidney slot equates that with the module external diameter front end of kidney slot is provided with block.
Described device for clamping and advancing work pieces machined comprises module binding clasp, mold pushing mechanism and bearing feed mechanism, described binding clasp is installed in the top of mold pushing mechanism and follows the mold pushing mechanism lifting to clamp or to unclamp module, and the screw bolt seat lifting is fixed and driven to the screw bolt seat in bearing feed mechanism and the transverse mode mechanism; Described bearing feed mechanism comprises bearing, screw mandrel, polished rod, described screw mandrel and polished rod pass bearing respectively, two ends are separately fixed at grinds on the body frame, be provided with linear bearing between the mating surface of polished rod and bearing endoporus, polished rod is the guide rail that bearing moves up and down, screw mandrel cooperates with nut on being fixed on bearing and drives bearing and move up and down, and screw mandrel is by feeding driven by motor.Mold pushing mechanism comprises cored screw, screw bolt seat and backform bar; cored screw passes screw bolt seat and by the supporting of the bearing at two ends; wherein the bearing block periphery of lower end is provided with belt grooves by main driven by motor; driving-disc is fixed on the bearing block of lower end; cored screw passes driving-disc and mount with it, and the backform bar is assemblied in the cored screw its upper end and stretches in the binding clasp.The cored screw of driving-disc below is provided with thrust bearing, and thrust bearing is by the ejection that makes progress of the pressure regulating spring of below, and the elastic force of pressure regulating spring is regulated by adjusting screw(rod).
Described binding clasp comprises base of the carrier head, jaw, chuck dish, base of the carrier head is positioned at the top of screw bolt seat, be provided with chuck dish and jaw in it, the chuck dish is installed in the cored screw upper end, jaw is evenly distributed on around the chuck dish, and jaw is installed on the chuck dish by bearing pin and can be a spot wobble by bearing pin, is provided with the taper fit face between jaw upper end and the base of the carrier head, be provided with radial spring between jaw and the chuck dish, be provided with axle spring between base of the carrier head and the chuck dish.
Described grinding head assembly also is provided with vibrating motor, eccentric shaft, driving member, and the output shaft of vibrating motor connects with eccentric shaft, and eccentric shaft is connected with the card grinding chuck by driving member.It also is provided with card grinding motor and turning cylinder, the card grinding motor is connected with the card grinding chuck, described driving member is card grinding motor fixing frame and upper and lower spring leaf, eccentric shaft connects with the card grinding motor fixing frame, turning cylinder is parallel with the card grinding motor fixing frame, the turning cylinder two ends are provided with upper and lower top board, are connected by upper and lower spring leaf between card grinding motor fixing frame and the upper and lower top board.The lower roof plate that is connected with turning cylinder is provided with the deflection adjustable plate, the both sides of deflection adjustable plate are provided with adjusting screw(rod), described eccentric shaft is installed in the slotted eye of rotating turret by bearing, the tail end of rotating turret is fixed on the grinding frame and can rotates around grinding frame, the front portion of rotating turret is connected with the card grinding motor fixing frame by bearing pin, and bearing pin is supported by the bearing in the slotted eye on the card grinding motor fixing frame.
The course of work of the present invention is as follows: module to be processed is placed in the dress mould tube, the driven by motor connecting rod, and connecting rod drives rocking arm, and rocking arm drives swinging axle, and the swinging axle drive pushes away template and makes arcuate movement.Mounting hole when pushing away template and be positioned at original position on it is aimed at the die orifice that of dress mould tube, and a module just drops in the mounting hole that pushes away template, finishes the preparation of sending mould.When sending the mould motor action, pushing away template makes arcuate movement and stretches out from the notch of support, in the time of directly over moving to binding clasp, the block that pushes away the mounting hole front end on the template will be pushed open by the module that the backform masthead goes out earlier, then to fall into binding clasp clamped for the module in the mounting hole, push away template immediately and turn back to original position, this motion back and forth realizes sending automatically mould.
After the processing module falls into binding clasp, feed motor and start working.Feed motor and rotate by the screw mandrel of band drive synchronously, screw mandrel drives bearing and moves up along polished rod, and bearing drives screw bolt seat, binding clasp moves upward.The initial period of motion, base of the carrier head is motionless, just chuck dish and jaw are driven by the backform bar and move upward, when chuck dish and jaw move upward after several millimeters, the impressed pressure of the axle spring between base of the carrier head and the chuck dish is eliminated, the elastic force of spring pushes taper fit face with base of the carrier head with jaw, and the processing wire drawing die is clamped.Then binding clasp integral body continues to rise to predetermined altitude with bearing, to with after card grinding contact, the bearing block of main driven by motor cored screw lower end rotates, and bearing block drives the driving-disc rotation, driving-disc drives cored screw, binding clasp rotates, and binding clasp drive wire drawing die rotates at a high speed and begins to grind.Produce certain grinding pressure between card grinding and the wire drawing die, along with the carrying out of grinding, grinding pressure reduces thereupon, the signal feedback that grinding pressure changes feeds motor, feed motor and continue upwards to promote, finish until grinding, grinding pressure is zero, feed the motor counter-rotating, bearing drives binding clasp and descends, and when dropping to base of the carrier head and arriving extreme lower position and can not descend again, motor is stall not, the chuck dish continues to descend, axle spring between compression clamp cephalic disc and the base of the carrier head makes jaw withdraw from taper fit face with base of the carrier head, under the effect of the radial spring between chuck dish and the jaw, making jaw is that fulcrum outwards is offset with the bearing pin, and jaw has unclamped wire drawing die.Limited block is touched in backform bar lower end simultaneously, and wire drawing die is ejected.The backform bar falls by gravity when feeding rising next time, gets ready for feeding to grind.
During grinding head assembly work, vibrating motor rotates, and converts the beat of eccentric shaft to by eccentric shaft, and the beat of eccentric shaft is by the card grinding motor fixing frame, spring leaf converts the up-down vibration of card grinding to up and down, its amplitude is constant, and vibration frequency can change by the rotating speed of regulating vibrating motor; Card grinding driven by motor card grinding rotates at a high speed; Upper and lower spring leaf can be that axis deflects with the turning cylinder, makes the vertical axis skew of the vertical axis and the module of card grinding, forms the monolateral grinding of card grinding to module.The shape of module endoporus, precision depend on the size of card grinding, after the card grinding wearing and tearing, can adjust the deflection of upper and lower spring leaf module is carried out monolateral grinding, to reach needed size, can grind wire drawing die tapered bore part.Card grinding, module be high-speed motion simultaneously, interacts, and has further improved grinding rate.
The invention has the beneficial effects as follows: module is by sending mold mechanism to fall into wherein directly over delivering to binding clasp; automatically feed, clamp automatically by the drive of bearing feed mechanism; drive the high speed spin finishing by mold pushing mechanism; card grinding is driven by eccentric shaft and makes up-down vibration; increased the relative motion between card grinding and the module; module has improved grinding rate so also at high-speed motion simultaneously.Adopt the automaticity of the whole process of the present invention to improve greatly, and guaranteed Grinding Quality, improved the yield rate of wire drawing die.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 send the structural representation of die device for the present invention
Fig. 3 send the vertical view of transmission mechanism in the die device for the present invention
Fig. 4 is the schematic diagram of device for clamping and advancing work pieces machined of the present invention
Fig. 5 is the schematic diagram of grinding head assembly of the present invention
Fig. 6 is the vertical view of grinding head assembly of the present invention
The specific embodiment
According to shown in Figure 1, a kind of grinder of the present invention, it comprises the grinding head assembly that module is ground, and send die device, device for clamping and advancing work pieces machined.Be provided with card grinding chuck 36 and card grinding 37 in the grinding head assembly, send die device to be positioned at the left side of device for clamping and advancing work pieces machined, send to be provided with in the die device and send mould motor 29 and push away template 24, be provided with binding clasp in the device for clamping and advancing work pieces machined, the described template 24 that pushes away pushes to module 1 in the binding clasp under sending mould motor 29 effect, card grinding 37 be positioned at binding clasp directly over.
Shown in Fig. 2,3, send die device mainly to comprise dress mould tube 22, support 23, push away template 24, swinging axle 26, rocking arm 27, connecting rod 28 and send mould motor 29, dress mould tube 22 vertically is fixed on the support 23, and support 23 is provided with long rabbet 25.Push away the below that template 24 stretches in the support 23 and is in dress mould tube 22, push away template 24 and be provided with kidney slot 31, the width of kidney slot 21 equates that with the module external diameter front end of kidney slot 31 is provided with block 30.Swinging axle 26 is installed in by bearing and grinds on the body frame, swinging axle 26 upper ends with push away template 24 and be connected, the lower end is connected with rocking arm 27, rocking arm 27 links to each other with the sheave that send mould motor 29 by connecting rod 28.Pushing away template 24 can stretch out from the support notch under sending mould motor 29 effect and move to above the binding clasp.
According to shown in Figure 4, device for clamping and advancing work pieces machined mainly is made up of wire drawing die binding clasp, mold pushing mechanism and bearing feed mechanism.Described bearing feed mechanism comprises bearing 8, screw mandrel 10, polished rod 11, and described screw mandrel 10 and polished rod 11 pass bearing 8 respectively, and screw mandrel 10 is installed in by the bearing supporting and grinds on the body frame, and the two ends of polished rod 11 are fixed on grinds on the body frame.Be provided with two cover linear bearings 12 between the mating surface of polished rod 11 and bearing endoporus, then bearing 8 can move up and down along polished rod 11.Screw mandrel 10 cooperates with nut on being fixed on bearing 8 and drives bearing 8 and move up and down, and screw mandrel 10 drives by feeding motor 9.
Among the present invention, mold pushing mechanism comprises cored screw 6, screw bolt seat 13 and backform bar 7.Screw bolt seat 13 is fixed as one with bearing 8, and cored screw 6 passes screw bolt seat 13 and by the bearing supporting at two ends, and wherein Shang Duan the bearing 3-5 millimeter that can endwisely slip is spacing by back-up ring; Bearing block 14 peripheries of lower end are provided with belt grooves by main driven by motor.Driving-disc 15 is fixed on the bearing block 14 of lower end, and cored screw 6 passes driving-disc 15, connects by threaded engagement between the two.Backform bar 7 is assemblied in the cored screw 6 and stretches in the binding clasp on it, grinds body frame and be provided with limited block below backform bar 7, stops to descend when backform bar 7 is run into limited block, and wire drawing die 1 is ejected.
The cored screw 6 of described driving-disc 15 belows is provided with thrust bearing 16, and thrust bearing 16 is by the pressure regulating spring 17 upwards ejections of below, and the elastic force of pressure regulating spring 17 is regulated by adjusting screw(rod) 18.Pressure regulating spring 17 can be regulated the pressure between card grinding and the wire drawing die 1, and machining accuracy was poor when pressure was excessive, and pressure too hour working (machining) efficiency is low.
Described binding clasp comprises base of the carrier head 5, jaw 2, chuck dish 19, and base of the carrier head 5 is positioned at the top of screw bolt seat 13, and is spacing by limit base 20, can move up and down in limit base 20.Be provided with chuck dish 19 and jaw 2 in the base of the carrier head 5, chuck dish 19 is installed in cored screw 6 upper ends by screw 21, and backform bar 7 passes from screw 21.Three jaws 2 are evenly distributed on around the chuck dish 19, jaw 2 is installed on the chuck dish 19 by bearing pin and can be a spot wobble by bearing pin, be provided with the taper fit face between jaw 2 upper ends and the base of the carrier head 5, be provided with radial spring 3 between jaw 3 and the chuck dish 19, be provided with axle spring 4 between base of the carrier head 5 and the chuck dish 19.
Grinding head assembly, it comprises card grinding motor 32, card grinding 37, card grinding chuck 36, vibrating motor 38, eccentric shaft 34 and driving member.According to Fig. 5, shown in Figure 6, card grinding motor 32 is connected with card grinding chuck 36, and card grinding 37 is fixed on the card grinding chuck 36.Described driving member is card grinding motor fixing frame 40, upper spring sheet 33 and lower spring sheet 35, and card grinding motor fixing frame 40 is solidly set on outside the card grinding motor 32.The output shaft of vibrating motor 38 connects with eccentric shaft 34, the other end of eccentric shaft 34 is installed in the slotted eye of rotating turret 41 by the bearing supporting, the tail end of rotating turret 41 is installed on the grinding frame and can rotates around grinding frame, the middle part of rotating turret 41 is connected with card grinding motor fixing frame 40 by bearing pin, and bearing pin is supported by the bearing in the slotted eye on the card grinding motor fixing frame 40.Parallel with card grinding motor fixing frame 40 and to be provided with turning cylinder 39, turning cylinder 39 is installed in the axle bed by bearing, and axle bed is fixed on and grinds on the frame.Turning cylinder 39 two ends are provided with upper and lower top board, are connected by upper and lower spring leaf between card grinding motor fixing frame 40 and the upper and lower top board.Be fixed with deflection adjustable plate 42 on the lower roof plate that turning cylinder 39 is connected, deflection adjustable plate 42 both sides are provided with adjusting screw(rod), adjusting screw(rod) passes the through hole that grinds on the frame, tail end withstands deflection adjustable plate 42.Upper and lower spring leaf drives card grinding 37 moving axis 39 deflections that can rotate, and its amount of deflection is regulated by adjusting screw(rod), regulates the vertical axis that card grinding departs from workpiece, forms the monolateral grinding of card grinding to workpiece.
If do not need to carry out monolateral grinding, in the time of promptly needn't adjusting the card grinding skew, eccentric shaft 34 directly can be fixed on the card grinding motor fixing frame 40.
Claims (10)
1, a kind of grinder, it comprises the grinding head assembly that module is ground, be provided with card grinding chuck (36) and card grinding (37) in the grinding head assembly, it is characterized in that it also is provided with send die device and device for clamping and advancing work pieces machined, send die device to be positioned at a side of device for clamping and advancing work pieces machined, send to be provided with in the die device and send mould motor (29) and push away template (24), be provided with binding clasp in the device for clamping and advancing work pieces machined, the described template (24) that pushes away is sending mould motor (29) module (1) to be pushed in the binding clasp under driving, card grinding (37) be positioned at binding clasp directly over.
2, grinder according to claim 1, it is characterized in that described sending also is provided with support (23) in the die device, dress mould tube (22), swinging axle (26); rocking arm (27) and connecting rod (28); dress mould tube (22) vertically is fixed on the support (23); push away the below that template (24) stretches in the support (23) and is in dress mould tube (22); swinging axle (26) is installed in by bearing and grinds on the body frame; swinging axle (26) upper end with push away template (24) and be connected; the lower end is connected with rocking arm (27), and rocking arm (27) links to each other with the sheave that send mould motor (29) by connecting rod (28).
3, grinder according to claim 2, it is characterized in that described support (23) is provided with notch (25), pushing away template (24) stretches out from notch (25) under sending mould motor (29) effect, push away template (24) and be provided with kidney slot (31), the width of kidney slot (31) equates that with the module external diameter front end of kidney slot (31) is provided with block (30).
4, grinder according to claim 1, it is characterized in that described device for clamping and advancing work pieces machined comprises binding clasp, mold pushing mechanism and bearing feed mechanism, described binding clasp is installed in the top of mold pushing mechanism and follows the mold pushing mechanism lifting to clamp or to unclamp wire drawing die, and screw bolt seat (13) lifting is fixed and driven to the screw bolt seat in bearing feed mechanism and the mold pushing mechanism (13); Described bearing feed mechanism comprises bearing (8), screw mandrel (10), polished rod (11), described screw mandrel (10) and polished rod (11) pass bearing (8) respectively, two ends are installed in respectively grinds on the body frame, be provided with linear bearing (12) between the mating surface of polished rod (11) and bearing endoporus, polished rod (11) is the guide rail that bearing (8) moves up and down, screw mandrel (10) cooperates with nut on being fixed on bearing (8) and drives bearing (8) and move up and down, and screw mandrel (10) drives by feeding motor (9).
5, grinder according to claim 4; it is characterized in that mold pushing mechanism comprises cored screw (6), screw bolt seat (13) and backform bar (7); cored screw (6) passes screw bolt seat (13) and by the supporting of the bearing at two ends; wherein the bearing block of lower end (14) periphery is provided with belt grooves by main driven by motor; driving-disc (15) is fixed on the bearing block (14) of lower end; cored screw (6) passes driving-disc (15) and mount with it, and backform bar (7) is assemblied in the cored screw (6) its upper end and stretches in the binding clasp.
6, grinder according to claim 5, the cored screw (6) that it is characterized in that driving-disc (15) below is provided with thrust bearing (16), thrust bearing (16) is by the upwards ejection of pressure regulating spring (17) of below, and the elastic force of pressure regulating spring (17) is regulated by adjusting screw(rod) (18).
7, grinder according to claim 4, it is characterized in that described binding clasp comprises base of the carrier head (5), jaw (2), chuck dish (19), base of the carrier head (5) is positioned at screw bolt seat (13) top, be provided with chuck dish (19) and jaw (2) in it, chuck dish (19) is installed in cored screw (6) upper end, jaw (2) is evenly distributed on chuck dish (19) on every side, jaw (2) is installed in chuck dish (19) by bearing pin and goes up also and can be a spot wobble by bearing pin, be provided with the taper fit face between jaw (2) upper end and the base of the carrier head (5), be provided with radial spring (3) between jaw (2) and the chuck dish (19), be provided with axle spring (4) between base of the carrier head (5) and the chuck dish (19).
8, grinder according to claim 1, it is characterized in that described grinding head assembly also is provided with vibrating motor (38), eccentric shaft (34), driving member, the output shaft of vibrating motor (38) connects with eccentric shaft (34), and eccentric shaft (34) is connected with card grinding chuck (36) by driving member.
9, grinder according to claim 8, it is characterized in that it also is provided with card grinding motor (32) and turning cylinder (39), card grinding motor (32) is connected with card grinding chuck (36), described driving member is card grinding motor fixing frame (40) and upper and lower spring leaf, eccentric shaft (34) connects with card grinding motor fixing frame (40), turning cylinder (39) is parallel with card grinding motor fixing frame (40), turning cylinder (39) two ends are provided with upper and lower top board, are connected by upper and lower spring leaf between card grinding motor fixing frame (40) and the upper and lower top board.
10, grinder according to claim 9, it is characterized in that the lower roof plate that is connected with turning cylinder (39) is provided with deflection adjustable plate (42), the both sides of deflection adjustable plate (42) are provided with adjusting screw(rod), described eccentric shaft (34) is installed in the slotted eye of rotating turret (41) by bearing, the tail end of rotating turret (41) is fixed on the grinding frame and can rotates around grinding frame, the front portion of rotating turret (41) is connected with card grinding motor fixing frame (40) by bearing pin, and bearing pin is supported by the bearing in the slotted eye on the card grinding motor fixing frame (40).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB2006100973872A CN100534714C (en) | 2006-11-03 | 2006-11-03 | Lapping machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB2006100973872A CN100534714C (en) | 2006-11-03 | 2006-11-03 | Lapping machine |
Publications (2)
Publication Number | Publication Date |
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CN1947936A true CN1947936A (en) | 2007-04-18 |
CN100534714C CN100534714C (en) | 2009-09-02 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CNB2006100973872A Active CN100534714C (en) | 2006-11-03 | 2006-11-03 | Lapping machine |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103894897A (en) * | 2012-12-27 | 2014-07-02 | 日照海恩锯业有限公司 | Coordinate type saw blade base body internal grinding machine |
CN105479278A (en) * | 2015-12-30 | 2016-04-13 | 镇江耐丝新型材料有限公司 | Automatic equipment for die machining |
CN108838763A (en) * | 2018-06-23 | 2018-11-20 | 芜湖乾凯材料科技有限公司 | Pore digital controlled grinding device suitable for workpiece center hole |
CN110153816A (en) * | 2019-05-31 | 2019-08-23 | 西安文理学院 | It is a kind of to draw ray machine automatically and draw light method |
CN112091732A (en) * | 2020-09-08 | 2020-12-18 | 珠海市微银信通科技有限公司 | Manufacturing method of metal wire drawing die |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB348699A (en) * | 1929-10-11 | 1931-05-18 | Rudolf Bsteh | Grinding and polishing machine |
GB927066A (en) * | 1961-06-05 | 1963-05-22 | Giuseppe Esposito | A multiple machine for grinding drawbench die holes |
GB1306941A (en) * | 1969-07-24 | 1973-02-14 | Hartridge Ltd Leslie | Machine for machining internal surfaces of workpieces |
-
2006
- 2006-11-03 CN CNB2006100973872A patent/CN100534714C/en active Active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103894897A (en) * | 2012-12-27 | 2014-07-02 | 日照海恩锯业有限公司 | Coordinate type saw blade base body internal grinding machine |
CN103894897B (en) * | 2012-12-27 | 2017-03-29 | 日照海恩锯业有限公司 | A kind of co-ordinate-type saw bit matrix internal grinder |
CN105479278A (en) * | 2015-12-30 | 2016-04-13 | 镇江耐丝新型材料有限公司 | Automatic equipment for die machining |
CN108838763A (en) * | 2018-06-23 | 2018-11-20 | 芜湖乾凯材料科技有限公司 | Pore digital controlled grinding device suitable for workpiece center hole |
CN110153816A (en) * | 2019-05-31 | 2019-08-23 | 西安文理学院 | It is a kind of to draw ray machine automatically and draw light method |
CN110153816B (en) * | 2019-05-31 | 2023-12-29 | 西安文理学院 | Automatic light pulling machine and light pulling method |
CN112091732A (en) * | 2020-09-08 | 2020-12-18 | 珠海市微银信通科技有限公司 | Manufacturing method of metal wire drawing die |
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