CN108907185A - Hard alloy moulding stamper - Google Patents
Hard alloy moulding stamper Download PDFInfo
- Publication number
- CN108907185A CN108907185A CN201810903149.9A CN201810903149A CN108907185A CN 108907185 A CN108907185 A CN 108907185A CN 201810903149 A CN201810903149 A CN 201810903149A CN 108907185 A CN108907185 A CN 108907185A
- Authority
- CN
- China
- Prior art keywords
- push
- down head
- stairstepping
- die
- mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
Abstract
The present invention relates to a kind of hard alloy moulding stampers, including:Upper mold, lower die equipped with lower die holder, loaded in upper mold and being equipped with the upper dies of several seaming chucks being uniformly distributed along the circumference, in the installation through-hole being equipped with loaded on lower die and it is equipped with several upper ends and seaming chuck corresponds opposite die cavity holes, several one-to-one correspondence are arranged in the lower die of the pushing component in die cavity holes;Seaming chuck, die cavity holes and pushing component surround structure forming cavity;Push mandrel, interior push-down head and the outer push-down head that component includes coaxial arrangement;The upper end of mandrel is flushed lower than lower die upper end or with die cavity holes upper end, and outer push-down head upper end is lower than mandrel upper end, and interior push-down head upper end is lower than outer push-down head upper end;The diameter of seaming chuck is adapted to the diameter of die cavity holes, and seaming chuck lower end is equipped with the jack that diameter is adapted to axle diameter.The hard alloy moulding stamper production efficiency is higher, and suitable for multi-diameter shaft shape and the hard alloy molded part equipped with mesoporous produces.
Description
Technical field
The present invention relates to mould applications, especially a kind of hard alloy moulding stamper.
Background technique
Hard alloy is hard compounds and binding metal one kind made of powder metallurgical technique of refractory metal
Widely used alloy material;Hard alloy has the Optimalities such as hardness is high, wear-resisting, intensity and toughness are preferable, heat-resisting, corrosion-resistant
Energy;Produce the pressing mold of solid shape hard alloy molded part in enormous quantities, there is a cavity plate, a seaming chuck and a push-down head,
When production, cavity plate, seaming chuck and push-down head are loaded on respectively and are placed on the standard die set on mo(u)ldenpress;It is attached shown in Fig. 4 to be
A kind of shape is multi-diameter shaft shape and the hard alloy molded part 40 for being equipped with mesoporous, which shaken for mobile phone
Dynamic " mass block ", is commonly called as " oscillator ";That there are production efficiencys is lower traditional pressing mold, is not suitable for multi-diameter shaft shape and is equipped with
The deficiency of the hard alloy molded part production in hole, therefore, it is higher to design a kind of production efficiency, suitable for multi-diameter shaft shape and is equipped with
The hard alloy moulding stamper of the hard alloy molded part production in hole, becomes urgent problem to be solved.
Summary of the invention
It is lower that there are production efficiencys the purpose of the invention is to overcoming current pressing mold, is not suitable for multi-diameter shaft shape and sets
There is a deficiency of the hard alloy molded part production of mesoporous, it is higher to provide a kind of production efficiency, suitable for multi-diameter shaft shape and is equipped with
The hard alloy moulding stamper of the hard alloy molded part production in hole.
The specific technical solution of the present invention is:
A kind of hard alloy moulding stamper, including:Upper mold, the lower die equipped with lower die holder, loaded in upper mold and equipped with several edges
The upper die of the seaming chuck of circumference uniform distribution in the installation through-hole being equipped with loaded on lower die and is equipped with several upper ends and seaming chuck one by one
Corresponding opposite die cavity holes, several one-to-one correspondence are arranged in the lower die of the pushing component in die cavity holes;Seaming chuck, die cavity holes
Structure forming cavity is surrounded with component is pushed;Push mandrel, interior push-down head and the outer push-down head that component includes coaxial arrangement;Mandrel it is upper
End is flushed lower than lower die upper end or with die cavity holes upper end, and outer push-down head upper end is lower than mandrel upper end, and interior push-down head upper end is lower than
Outer push-down head upper end;The diameter of seaming chuck is adapted to the diameter of die cavity holes, and seaming chuck lower end is equipped with diameter and is adapted to axle diameter
Jack.The hard alloy moulding stamper is equipped with several and surrounds the type constituted by seaming chuck, die cavity holes and pushing component
Chamber, production efficiency is higher, pushes mandrel, interior push-down head and outer push-down head that component includes coaxial arrangement, is suitable for multi-diameter shaft shape
And the hard alloy molded part for being equipped with mesoporous produces;The upper end of mandrel is flushed lower than lower die upper end or with die cavity holes upper end, benefit
Hard alloy molded part is detached from when lower die declines and demoulds.
Preferably, the pushing component further includes:Interior push-down head height adjustment device on the downside of lower die;It is interior
Push-down head height adjustment device includes:Lower end is open and upper end is equipped with outside number stairstepping identical with interior push-down head number and fixes
The height adjustment cylinder in hole set on interior push-down head lower end and corresponds fixed outside the stairstepping being fixed on outside stairstepping in fixation hole
Head, the bulge loop of side wall lower end outside height adjustment cylinder, set at least one outer anti-rotation vertical slot and number of bulge loop side wall and outer
The identical outer guiding lock-screw of anti-rotation vertical slot number, several supporting screws;One side pressure of the screw rod of outer guiding lock-screw
Firmly outer anti-rotation vertical slot bottom surface and it is spirally connected with lower die holder;One end of the screw rod of supporting screw supports height adjustment cylinder lower end and under
Die holder is spirally connected.The outer guiding lock-screw and outer anti-rotation vertical slot of interior push-down head height adjustment device cooperate, and can facilitate in adjusting
The height of push-down head and locking, adapt to the molding needs of the hard alloy molded part of different height, and can prevent height adjustment
Cylinder rotation generates interference.
Preferably, the pushing component further includes:Mandrel height adjustment device;Mandrel height adjustment device includes:
In height adjustment cylinder inner hole and upper end is equipped with the mandrel fixed cylinder of fixation hole in stairstepping, set on mandrel lower end and is fixed on
Stairstepping interior gland in stairstepping in fixation hole, lower end is connect with lower die holder and upper end is protruded into mandrel fixed cylinder inner hole
Axis, anti-rotation vertical slot and number interior guiding locking screw identical with interior anti-rotation vertical slot number at least one of axis side wall
Nail;It pushes down interior anti-rotation vertical slot bottom surface and is spirally connected with mandrel fixed cylinder side wall in one end of the screw rod of interior guiding lock-screw.Mandrel is high
The interior guiding lock-screw and interior anti-rotation vertical slot for spending regulating device cooperate, and can facilitate the height for adjusting mandrel and locking, make core
The upper end of axis is flushed lower than lower die upper end or with die cavity holes upper end, and can prevent the rotation of mandrel fixed cylinder from generating interference.
Preferably, the lower die includes:It is located at the cavity plate of the stairstepping accommodating mesoporous of upper end equipped with big end, it is fixed
Mode in stairstepping accommodating mesoporous big end is sequentially arranged in pushing down under mode in stairstepping accommodating mesoporous small end from top to bottom
The elastic washer at end is adapted to outer push-down head diameter equipped with several diameters and corresponds the location hole covered outside outer push-down head
Outer push-down head pressing plate, equipped with location hole correspond and diameter be greater than positioning bore dia several outer push-down head fixation holes
Outer push-down head fixed plate, the outer lower press pushing down outer push-down head fixed plate lower end and being connect with cavity plate lower end;Die cavity holes position
In on mode;Outer push-down head lower end is equipped with the fixed flange being located in outer push-down head fixation hole.The structure of lower die be conducive to it is outer under
The assembly and disassembly of pressure head are fixed;The lower die durability that mode improves;Elastic washer has cushioning buffer effect.
Preferably, the upper die includes:Equipped with number, identical and big end is located at the rank of upper end with seaming chuck number
The mounting disc of trapezoidal upper fixation hole set on seaming chuck upper end and corresponds on the stairstepping being fixed on stairstepping in fixation hole
Fixing head, the upper pressure attachment base being detachably connected respectively with upper mold lower end and mounting disc upper end.The structure of upper die is conducive to upper pressure
The assembly and disassembly of head are fixed.
Preferably, the installation through-hole is the stairstepping installation through-hole that big end is located at lower die upper end;Lower die is loaded on
In the big end of stairstepping installation through-hole.Installation through-hole is that big end is located at the stairstepping installation through-hole of lower die upper end conducive to lower die
Installation is fixed.
Compared with prior art, the beneficial effects of the invention are as follows:The hard alloy moulding stamper be equipped with several by
Seaming chuck, die cavity holes and pushing component surround the type chamber of composition, and production efficiency is higher, push the core that component includes coaxial arrangement
Axis, interior push-down head and outer push-down head, suitable for multi-diameter shaft shape and the hard alloy molded part equipped with mesoporous produces;The upper end of mandrel
It is flushed lower than lower die upper end or with die cavity holes upper end, hard alloy molded part is detached from when being conducive to lower die decline demoulding.Interior pushing
The outer guiding lock-screw and outer anti-rotation vertical slot of grease head highness regulating device cooperate, and can facilitate the height and lock of push-down head in adjusting
Tightly, the molding needs of the hard alloy molded part of different height are adapted to, and can prevent the rotation of height adjustment cylinder from generating interference.Core
The interior guiding lock-screw and interior anti-rotation vertical slot of axis height adjustment device cooperate, and can facilitate the height for adjusting mandrel and locking,
Make the upper end of mandrel lower than lower die upper end or flushed with die cavity holes upper end, is conducive to hard alloy molded part when lower die decline demoulding
It is detached from, and can prevent the rotation of mandrel fixed cylinder from generating interference.The assembly and disassembly that the structure of lower die is conducive to outer push-down head are fixed;Mode mentions
High lower die durability;Elastic washer has cushioning buffer effect.The assembly and disassembly that the structure of upper die is conducive to seaming chuck are fixed.Peace
Dress through-hole is fixed for the installation that the stairstepping installation through-hole that big end is located at lower die upper end is conducive to lower die.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the invention;
Fig. 2 is the enlarged drawing in Fig. 1 at A;
Fig. 3 is the structural schematic diagram of mode;
Fig. 4 is the structural schematic diagram of hard alloy molded part.
In figure:Upper mold 1, lower die holder 2, lower die 3, seaming chuck 4, upper die 5, installation through-hole 6, die cavity holes 7, lower die 8, core
Axis 9, interior push-down head 10, outer push-down head 11, jack 12, stairstepping outer fixation hole 13, height adjustment cylinder 14, stairstepping outer gland
15, bulge loop 16, outer anti-rotation vertical slot 17, outer guiding lock-screw 18, supporting screw 19, fixation hole 20, mandrel are fixed in stairstepping
Cylinder 21, stairstepping interior gland 22, axis 23, interior anti-rotation vertical slot 24, interior guiding lock-screw 25, stairstepping accommodate mesoporous 26,
Cavity plate 27, mode 28, elastic washer 29, location hole 30, outer push-down head pressing plate 31, outer push-down head fixation hole 32, outer push-down head are solid
Fixed board 33, outer lower press 34, fixed flange 35, fixation hole 36 on stairstepping, mounting disc 37, fixing head 38 on stairstepping, on
Press attachment base 39, hard alloy molded part 40.
Specific embodiment
The present invention is described further shown in reference to the accompanying drawing.
As shown in attached drawing 1, attached drawing 2, attached drawing 3, attached drawing 4:A kind of hard alloy moulding stamper, including:Upper mold 1, is equipped with down
The lower die 3 of die holder 2 is equipped with loaded in upper mold 1 and setting there are three the upper die 5 of seaming chuck 4 being uniformly distributed along the circumference loaded on lower die 3
Installation through-hole 6 in and set and correspond 7, three one-to-one correspondence of opposite die cavity holes there are three upper end with seaming chuck 4 and be arranged in
The lower die 8 of pushing component in die cavity holes 7;Seaming chuck 4, die cavity holes 7 and pushing component surround structure forming cavity;Push component packet
Include the mandrel 9, interior push-down head 10 and outer push-down head 11 of coaxial arrangement;The upper end of mandrel 9 is lower than 8 upper end of lower die or and die cavity holes
7 upper ends flush, and outer 11 upper end of push-down head is lower than 9 upper end of mandrel, and interior 10 upper end of push-down head is lower than outer 11 upper end of push-down head;Seaming chuck
4 diameter and the diametric clearance of die cavity holes 7 cooperate, and 4 lower end of seaming chuck is equipped with the jack of diameter and the cooperation of 9 diametric clearance of mandrel
12;The internal diameter transition fit of the diameter of mandrel 9 and interior push-down head 10;The internal diameter mistake of the outer diameter of interior push-down head 10 and outer push-down head 11
Cross cooperation;The outer diameter of outer push-down head 11 and the diameter transition of die cavity holes 7 cooperate;In the present embodiment, the upper end of mandrel 9 and type chamber
7 upper end of hole flushes.
The pushing component further includes:Interior push-down head height adjustment device positioned at 8 downside of lower die;Interior pushing head height
Spending regulating device includes:Lower end is open and upper end is equipped with fixation hole 13 outside number and the identical stairstepping of 10 numbers of interior push-down head
Height adjustment cylinder 14, set on interior 10 lower end of push-down head and one-to-one correspondence is fixed on outside the stairstepping outside stairstepping in fixation hole 13 admittedly
Determine first 15, the bulge loop 16 set on the outer side wall lower end of height adjustment cylinder 14, set on four outer 17 Hes of anti-rotation vertical slot of 16 side wall of bulge loop
Number and the identical outer guiding lock-screw 18 of 17 numbers of outer anti-rotation vertical slot, four supporting screws 19;Outer guiding lock-screw 18
One end of screw rod push down outer 17 bottom surface of anti-rotation vertical slot and be spirally connected with lower die holder 2;One end of the screw rod of supporting screw 19 supports
It 14 lower end of height adjustment cylinder and is spirally connected with lower die holder 2.The small end of the outer fixation hole 13 of stairstepping is located at upper end.Outer 17 edge of anti-rotation vertical slot
14 circumference of height adjustment cylinder is uniformly distributed.
The pushing component further includes:Mandrel height adjustment device;Mandrel height adjustment device includes:It is adjusted set on height
It saves in 14 inner hole of cylinder and upper end is equipped with the mandrel fixed cylinder 21 of fixation hole 20 in stairstepping, set on 9 lower end of mandrel and be fixed on rank
Stairstepping interior gland 22 in trapezoidal interior fixation hole 20, lower end and lower die holder 2 are spirally connected and upper end is protruded into mandrel fixed cylinder 21
Axis 23 in hole, it is identical interior set on the three interior anti-rotation vertical slots 24 and number and 24 numbers of interior anti-rotation vertical slot of 23 side wall of axis
It is oriented to lock-screw 25;It is interior guiding lock-screw 25 screw rod one end push down interior 24 bottom surface of anti-rotation vertical slot and with mandrel fixed cylinder
21 side walls are spirally connected.The small end of fixation hole 20 is located at upper end in stairstepping.Interior anti-rotation vertical slot 24 is uniformly distributed along 23 circumference of axis.
The lower die 8 includes:It is located at the cavity plate 27 of the stairstepping accommodating mesoporous 26 of upper end equipped with big end, is fixed on rank
Mode 28 in trapezoidal accommodating 26 big end of mesoporous is sequentially arranged in stairstepping accommodating 26 small end of mesoporous from top to bottom and pushes down mode
The elastic washer 29 of 28 lower ends, set there are three diameter and outer 11 diametric clearance of push-down head cooperation and correspond cover in outer push-down head
The outer push-down head pressing plate 31 of location hole 30 outside 11, equipped with being corresponded with location hole 30 and diameter is greater than 30 diameter of location hole
The outer push-down head fixed plate 33 of three outer push-down head fixation holes 32, push down outer 33 lower end of push-down head fixed plate and with 27 lower end of cavity plate
The outer lower press 34 being spirally connected;Die cavity holes 7 are located on mode 28;Outer 11 lower end of push-down head, which is equipped with, is located at outer 11 fixation hole of push-down head
In fixed flange 35.The material of elastic washer 29 is rubber.
The upper die 5 includes:Equipped with number, identical and big end is located on the stairstepping of upper end admittedly with 4 numbers of seaming chuck
The mounting disc 37 for determining hole 36 set on 4 upper end of seaming chuck and corresponds on the stairstepping being fixed on stairstepping in fixation hole 36
Fixing head 38, the upper pressure attachment base 39 being connect respectively with 1 lower end of upper mold and 37 upper end of mounting disc by screw.
In the present embodiment, the installation through-hole 6 is the stairstepping installation through-hole 6 that big end is located at 3 upper end of lower die;Lower die
In 8 big ends loaded on stairstepping installation through-hole 6.
The hard alloy moulding stamper is in use, adjust interior push-down head 10 by interior push-down head height adjustment device
Height adapts to the molding needs of the hard alloy molded part of different height;Adjusting core can be facilitated by mandrel height adjustment device
The height of axis 9 flushes the upper end of mandrel 9 with 7 upper end of die cavity holes.
The beneficial effects of the invention are as follows:The hard alloy moulding stamper be equipped with several by seaming chuck, die cavity holes and
Push component and surround the type chamber of composition, production efficiency is higher, push mandrel, interior push-down head that component includes coaxial arrangement and it is outer under
Pressure head, suitable for multi-diameter shaft shape and the hard alloy molded part equipped with mesoporous produces;The upper end of mandrel lower than lower die upper end or
It is flushed with die cavity holes upper end, hard alloy molded part is detached from when being conducive to lower die decline demoulding.Interior push-down head height adjustment device
Outer guiding lock-screw and outer anti-rotation vertical slot cooperate, and can facilitate the height of push-down head and locking in adjusting, adapt to different height
The molding of the hard alloy molded part of degree needs, and can prevent the rotation of height adjustment cylinder from generating interference.Mandrel height adjustment device
Interior guiding lock-screw and interior anti-rotation vertical slot cooperate, the height for adjusting mandrel and locking can be facilitated, make the upper end of mandrel with
Die cavity holes upper end flushes, and hard alloy molded part is detached from when being conducive to lower die decline demoulding, and can prevent the rotation of mandrel fixed cylinder from producing
Raw interference.The assembly and disassembly that the structure of lower die is conducive to outer push-down head are fixed;The lower die durability that mode improves;Elastic washer has
Cushioning buffer effect.The assembly and disassembly that the structure of upper die is conducive to seaming chuck are fixed.Installation through-hole is the rank that big end is located at lower die upper end
The installation that trapezoidal installation through-hole is conducive to lower die is fixed.
In addition to the implementation, within the scope of the claims of the present invention and the specification, skill of the invention
Art feature or technical data can be reselected and be combined, to constitute new embodiment, these are all art technologies
Personnel are without carrying out what creative work can be realized, therefore the embodiment that these present invention are not described in also should be regarded as this
The specific embodiment of invention and within protection scope of the present invention.
Claims (6)
1. a kind of hard alloy moulding stamper, including:Upper mold, the lower die equipped with lower die holder, characterized in that the hard alloy
Moulding stamper further includes:Loaded in upper mold and be equipped with several seaming chucks being uniformly distributed along the circumference upper die, be equipped with loaded on lower die
Installation through-hole in and be equipped with that several upper ends with seaming chuck correspond opposite die cavity holes, several one-to-one correspondence are arranged in
The lower die of pushing component in die cavity holes;Seaming chuck, die cavity holes and pushing component surround structure forming cavity;It includes same for pushing component
Mandrel, interior push-down head and the outer push-down head of axis setting;The upper end of mandrel is flushed lower than lower die upper end or with die cavity holes upper end, outside
Push-down head upper end is lower than mandrel upper end, and interior push-down head upper end is lower than outer push-down head upper end;The diameter of seaming chuck and die cavity holes it is straight
Diameter adaptation, seaming chuck lower end are equipped with the jack that diameter is adapted to axle diameter.
2. hard alloy moulding stamper according to claim 1, it is characterised in that:The pushing component further includes:Position
Interior push-down head height adjustment device on the downside of lower die;Interior push-down head height adjustment device includes:Lower end is open and upper end is set
There is the height adjustment cylinder of the outer fixation hole of number stairstepping identical with interior push-down head number, is set to interior push-down head lower end and one is a pair of
The stairstepping outer gland that should be fixed in the outer fixation hole of stairstepping, the bulge loop of side wall lower end, is set to outside height adjustment cylinder
The outer anti-rotation vertical slot of at least one of bulge loop side wall and number outer guiding lock-screw identical with outer anti-rotation vertical slot number, several
Supporting screw;It pushes down outer anti-rotation vertical slot bottom surface and is spirally connected with lower die holder in one end of the screw rod of outer guiding lock-screw;Supporting screw
One end of screw rod support height adjustment cylinder lower end and be spirally connected with lower die holder.
3. hard alloy moulding stamper according to claim 2, it is characterised in that:The pushing component further includes:Core
Axis height adjustment device;Mandrel height adjustment device includes:In height adjustment cylinder inner hole and upper end is equipped in stairstepping admittedly
The mandrel fixed cylinder for determining hole, set on mandrel lower end and the stairstepping interior gland that is fixed in stairstepping in fixation hole, lower end with
Lower die holder connection and upper end protrude into the axis in mandrel fixed cylinder inner hole, at least one of axis side wall anti-rotation vertical slot and
Number interior guiding lock-screw identical with interior anti-rotation vertical slot number;Push down interior anti-rotation in one end of the screw rod of interior guiding lock-screw
It vertical slot bottom surface and is spirally connected with mandrel fixed cylinder side wall.
4. hard alloy moulding stamper according to claim 1 or 2 or 3, it is characterised in that:The lower die includes:
It is located at the cavity plate of the stairstepping accommodating mesoporous of upper end, the mode being fixed in stairstepping accommodating mesoporous big end, from upper equipped with big end
Be sequentially arranged under stairstepping accommodating mesoporous small end in the elastic washer for pushing down mode lower end, be equipped with several diameters and it is outer under
Pressure head diameter is adapted to and one-to-one correspondence covers the outer push-down head pressing plate of the location hole outside outer push-down head, be equipped with and location hole one is a pair of
It answers and diameter is greater than the outer push-down head fixed plate for positioning several outer push-down head fixation holes of bore dia, push down outer push-down head and fix
Plate lower end and the outer lower press being connect with cavity plate lower end;Die cavity holes are located on mode;Outer push-down head lower end be equipped be located at it is outer under
Fixed flange in pressure head fixation hole.
5. hard alloy moulding stamper according to claim 1 or 2 or 3, it is characterised in that:The upper die includes:
Equipped with number, identical and big end is located at the mounting disc of fixation hole on the stairstepping of upper end with seaming chuck number, is set to seaming chuck upper end
And fixing head on the stairstepping being fixed on stairstepping in fixation hole is corresponded, it respectively can with upper mold lower end and mounting disc upper end
The upper pressure attachment base of dismantling connection.
6. hard alloy moulding stamper according to claim 1 or 2 or 3, it is characterised in that:The installation through-hole is big
End is located at the stairstepping installation through-hole of lower die upper end;Lower die is loaded in the big end of stairstepping installation through-hole.
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CN201810903149.9A CN108907185A (en) | 2018-08-09 | 2018-08-09 | Hard alloy moulding stamper |
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CN201810903149.9A CN108907185A (en) | 2018-08-09 | 2018-08-09 | Hard alloy moulding stamper |
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CN111375682A (en) * | 2020-01-08 | 2020-07-07 | 横店集团东磁股份有限公司 | Forming die for Z-axis linear motor mass block |
CN112692290A (en) * | 2020-12-31 | 2021-04-23 | 横店集团东磁股份有限公司 | Novel machining method for hard alloy threads |
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CN112692290A (en) * | 2020-12-31 | 2021-04-23 | 横店集团东磁股份有限公司 | Novel machining method for hard alloy threads |
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