CN106987769A - A kind of high rigidity fine etching cutting die - Google Patents

A kind of high rigidity fine etching cutting die Download PDF

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Publication number
CN106987769A
CN106987769A CN201710197048.XA CN201710197048A CN106987769A CN 106987769 A CN106987769 A CN 106987769A CN 201710197048 A CN201710197048 A CN 201710197048A CN 106987769 A CN106987769 A CN 106987769A
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cutting die
heated
cooled
minutes
high rigidity
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CN106987769B (en
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刘浩
张君
张欢芬
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Suzhou Hao Yan Precision Mold Ltd Co
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Suzhou Hao Yan Precision Mold Ltd Co
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Priority to DE202017006865.6U priority patent/DE202017006865U1/en
Priority to PCT/CN2017/115356 priority patent/WO2018176905A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4436—Materials or surface treatments therefore

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
  • Forests & Forestry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The present invention is a kind of high rigidity fine etching cutting die, and its weight percent composition is：C：0.07~0.09%, Si：0.33~0.35%, Mn：1.5~1.7%, P：0.01~0.03%, S：0.001~0.003%, Nb：0.015~0.017%, Ti：0.023~0.025%, Ni：0.3~0.5%, Cr：0.7~0.9%, Cu：0.2~0.4%, Al：0.06~0.08%, surplus is Fe and impurity.The present invention improves the cutting ability of etching cutting die by Ni and Cu content；The hardness of etching cutting die is improved by Nb, Ti, Cr and Cu content, hardness is up to HRC47 51 after testing；Toughness is improved by Nb, Ti, Ni, Cr and Al content, toughness is up to 80 85J/cm after testing2。

Description

A kind of high rigidity fine etching cutting die
Technical field
The present invention relates to a kind of mould, the high rigidity of specifically a kind of toughness, machinability and excellent in abrasion resistance is accurate Etch cutting die.
Background technology
Etching cutting die dimensional accuracy very high, typically may remain in ± 0.03mm, edge of a knife smooth degree is maintained at ± 0.01 or so.Etching cutting die is mainly used in cross cutting industry cropping of products label etc., the module on liquid crystal display, touch-screen Cut, etching cutting die shows oneself quite superior effect.
The preparation of etching cutting die generally comprises following steps：
Corrosion：Corrosion department is connected to the film and work order, after confirming thickness of slab, knife up material category, that is, carry out patch film printing down and Exposure, is eventually passed after liquid medicine is handled and shows mould blank, and such as exposure work is not carried out, after need to being repaired to figure It can enter and be corroded in etching machine, reach and can be taken off after requirement, after washing away liquid medicine carbon deposit, you can send into next department Corrosion portion is a roughing department to mould.
CNC is carved：Engraving department is connected to the cutting die after roughing, and visual inspection is put into board after confirming and is processed. Due to mould size and the short difference of complexity knife line length, the Production Time general cutting die of gap 1-4 hours are carried out, it is special Different need even can just complete CNC processing for 8 hours for more than 24 hours.Being primarily determined that after completion has no problem, and can just send into QC.
QC：QC is responsible for examining cutting die size, the cutting die knife edge etc., and is responsible for making survey report, feeding heat treatment afterwards. Material difference is punched according to client and is divided into two kinds of processing modes, progress of the material without adhesive sticker is typically heat-treated, do not done Glue material will also carry out plating the processing of Teflon in addition to carrying out hardened by heat treatment stiffened degree, and Teflon can make the product of punching Non-stick knife mould, but be due to that technique is special, plating Teflon does not interfere with the sharpness of cutting die.Affixed one's seal by being responsible on survey report Cutting die can carry out packaging shipment afterwards.
The processing of minute surface OR coating：Present treatment can remove the small lines in cutting die knife edge side, reaches mirror effect, can effectively solve The problem of taking burr dust out of when certainly knife is taken out in product punching, makes product edge flat smooth, it is adaptable to which the requirement of punching is higher Product.Taking coating processing to prevent from getting rusty general cutting die more.
The content of the invention
The technical problems to be solved by the invention are, propose a kind of high rigidity fine etching cutting die, can be effectively increased toughness, Machinability, wearability and hardness.
The present invention solve above technical problem technical scheme be：
A kind of high rigidity fine etching cutting die, its weight percent composition is：C：0.07~0.09%, Si：0.33~0.35%, Mn：1.5~1.7%, P：0.01~0.03%, S：0.001~0.003%, Nb：0.015~0.017%, Ti：0.023~0.025%, Ni：0.3~0.5%, Cr：0.7~0.9%, Cu：0.2~0.4%, Al：0.06~0.08%, surplus is Fe and impurity.
The Technology for Heating Processing of high rigidity fine etching cutting die, Technology for Heating Processing is carried out after CNC artistic carving, is heat-treated work Skill comprises the following steps：
(i) etching cutting die is heated to 750-770 DEG C, is incubated 15-17 minutes, then air cooling 10-13 minutes, then cutting die is heated To 650-670 DEG C, 450-470 DEG C then is cooled fast to by compressed air, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 550-570 DEG C, is incubated 12-14 minutes, be then cooled to using spray form water by cutting die is etched 370-390 DEG C, then etching cutting die is heated to 610-630 DEG C, then water cooling is finally air-cooled to room temperature to 310-330 DEG C.
The beneficial effects of the invention are as follows：The present invention improves the cutting ability of etching cutting die by Ni and Cu content；It is logical Cross Nb, Ti, Cr and Cu content to improve the hardness of etching cutting die, hardness is up to HRC47-51 after testing；By Nb, Ti, Ni, Cr and Al content improves toughness, and toughness is up to 80-85J/cm after testing2；Further, since etching cutting die preparation need through Super-corrosion process, therefore, in the design of its composition, it is impossible to its corrosion resisting property, but etching knife are improved by the control of composition Mould is when specifically used, and punching material contains glue class mostly, it is necessary to it has antiacid corrosion resisting property, can only be by follow-up heat at Manage to improve its antiacid corrosion resisting property, the present invention makes etching knife mold have excellent antiacid corrosion resisting property by Technology for Heating Processing, Obtain unexpected technique effect.Present invention etching cutting die HIC performances, are tested according to NACE TM0248-A experimental solutions Standard is carried out,（CTR）≤ 5%,（CSR）≤ 2%,（CLR）≤15%；SSC performances carry out four-point bending examination by ASTM G39 standards Test, 4 bend tests, test period 720 hours are carried out in NACE TM0177 solution A, sample loading stress is actual The 80% of yield strength, is observed, test specimen thickness of sample direction does not have crackle after experiment under 10 times of enlargement ratios.
Embodiment
Embodiment 1
The present embodiment is a kind of high rigidity fine etching cutting die, and its weight percent composition is：C：0.07%, Si：0.33%, Mn： 1.5%, P：0.01%, S：0.001%, Nb：0.015%, Ti：0.023%, Ni：0.3%, Cr：0.7%, Cu：0.2%, Al：0.06%, it is remaining Measure as Fe and impurity.
The Technology for Heating Processing of the high rigidity fine etching cutting die of the present embodiment, comprises the following steps：
(i) etching cutting die is heated to 750 DEG C, is incubated 15 minutes, then air cooling 10 minutes, then cutting die is heated to 650 DEG C, so 450 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 550 DEG C, is incubated 12 minutes, then will etch cutting die using spray form water is cooled to 370 DEG C, then Cutting die is heated to 610 DEG C, then water cooling is finally air-cooled to room temperature to 310 DEG C.
After testing, the present embodiment hardness surveys toughness up to 80J/cm up to HRC472；Cutting die HIC performances are etched, experiment is pressed Carried out according to NACE TM0248-A experimental solutions standard,（CTR）≤ 5%,（CSR）≤ 2%,（CLR）≤15%；SSC performances press ASTM G39 standards carry out four-point bending test, and 4 bend tests are carried out in NACE TM0177 solution A, and test period 720 is small When, sample loading stress is the 80% of actual yield strength, is observed after experiment under 10 times of enlargement ratios, test specimen thickness of sample side To no crackle.
Embodiment 2
The present embodiment is a kind of high rigidity fine etching cutting die, and its weight percent composition is：C：0.08%, Si：0.34%, Mn： 1.6%, P：0.02%, S：0.002%, Nb：0.016%, Ti：0.024%, Ni：0.4%, Cr：0.8%, Cu：0.3%, Al：0.07%, it is remaining Measure as Fe and impurity.
The Technology for Heating Processing of the high rigidity fine etching cutting die of the present embodiment, comprises the following steps：
(i) etching cutting die is heated to 760 DEG C, is incubated 14 minutes, then air cooling 12 minutes, then cutting die is heated to 660 DEG C, so 460 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 560 DEG C, is incubated 13 minutes, then will etch cutting die using spray form water is cooled to 380 DEG C, then Cutting die is heated to 620 DEG C, then water cooling is finally air-cooled to room temperature to 320 DEG C.
After testing, the present embodiment hardness surveys toughness up to 82J/cm up to HRC492；Cutting die HIC performances are etched, experiment is pressed Carried out according to NACE TM0248-A experimental solutions standard,（CTR）≤ 5%,（CSR）≤ 2%,（CLR）≤15%；SSC performances press ASTM G39 standards carry out four-point bending test, and 4 bend tests are carried out in NACE TM0177 solution A, and test period 720 is small When, sample loading stress is the 80% of actual yield strength, is observed after experiment under 10 times of enlargement ratios, test specimen thickness of sample side To no crackle.
Embodiment 3
The present embodiment is a kind of high rigidity fine etching cutting die, and its weight percent composition is：C：0.09%, Si：0.35%, Mn： 1.7%, P：0.03%, S：0.003%, Nb：0.017%, Ti：0.025%, Ni：0.5%, Cr：0.9%, Cu：0.4%, Al：0.08%, it is remaining Measure as Fe and impurity.
The Technology for Heating Processing of the high rigidity fine etching cutting die of the present embodiment, comprises the following steps：
(i) etching cutting die is heated to 770 DEG C, is incubated 17 minutes, then air cooling 13 minutes, then cutting die is heated to 670 DEG C, so 470 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 570 DEG C, is incubated 14 minutes, then will etch cutting die using spray form water is cooled to 390 DEG C, then Cutting die is heated to 630 DEG C, then water cooling is finally air-cooled to room temperature to 330 DEG C.
After testing, the present embodiment hardness surveys toughness up to 85J/cm up to HRC512；Cutting die HIC performances are etched, experiment is pressed Carried out according to NACE TM0248-A experimental solutions standard,（CTR）≤ 5%,（CSR）≤ 2%,（CLR）≤15%；SSC performances press ASTM G39 standards carry out four-point bending test, and 4 bend tests are carried out in NACE TM0177 solution A, and test period 720 is small When, sample loading stress is the 80% of actual yield strength, is observed after experiment under 10 times of enlargement ratios, test specimen thickness of sample side To no crackle.
In addition to the implementation, the present invention can also have other embodiment.All use equivalent substitution or equivalent transformation shape Into technical scheme, all fall within the protection domain of application claims.

Claims (8)

1. a kind of high rigidity fine etching cutting die, it is characterised in that：Its weight percent composition is：C：0.07~0.09%, Si： 0.33~0.35%, Mn：1.5~1.7%, P：0.01~0.03%, S：0.001~0.003%, Nb：0.015~0.017%, Ti： 0.023~0.025%, Ni：0.3~0.5%, Cr：0.7~0.9%, Cu：0.2~0.4%, Al：0.06~0.08%, surplus is Fe And impurity.
2. high rigidity fine etching cutting die as claimed in claim 1, it is characterised in that：Its weight percent composition is：C： 0.07%, Si：0.33%, Mn：1.5%, P：0.01%, S：0.001%, Nb：0.015%, Ti：0.023%, Ni：0.3%, Cr：0.7%, Cu：0.2%, Al：0.06%, surplus is Fe and impurity.
3. high rigidity fine etching cutting die as claimed in claim 1, it is characterised in that：Its weight percent composition is：C： 0.08%, Si：0.34%, Mn：1.6%, P：0.02%, S：0.002%, Nb：0.016%, Ti：0.024%, Ni：0.4%, Cr：0.8%, Cu：0.3%, Al：0.07%, surplus is Fe and impurity.
4. high rigidity fine etching cutting die as claimed in claim 1, it is characterised in that：Its weight percent composition is：C： 0.09%, Si：0.35%, Mn：1.7%, P：0.03%, S：0.003%, Nb：0.017%, Ti：0.025%, Ni：0.5%, Cr：0.9%, Cu：0.4%, Al：0.08%, surplus is Fe and impurity.
5. the Technology for Heating Processing of high rigidity fine etching cutting die as claimed in claim 1, the Technology for Heating Processing is in CNC carvers Carried out after skill, it is characterised in that：The Technology for Heating Processing comprises the following steps：
(i) etching cutting die is heated to 750-770 DEG C, is incubated 15-17 minutes, then air cooling 10-13 minutes, then cutting die is heated To 650-670 DEG C, 450-470 DEG C then is cooled fast to by compressed air, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 550-570 DEG C, is incubated 12-14 minutes, be then cooled to using spray form water by cutting die is etched 370-390 DEG C, then cutting die is heated to 610-630 DEG C, then water cooling is finally air-cooled to room temperature to 310-330 DEG C.
6. the Technology for Heating Processing of high rigidity fine etching cutting die as claimed in claim 5, it is characterised in that：The Technology for Heating Processing Comprise the following steps：
(i) etching cutting die is heated to 750 DEG C, is incubated 15 minutes, then air cooling 10 minutes, then cutting die is heated to 650 DEG C, so 450 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 550 DEG C, is incubated 12 minutes, then will etch cutting die using spray form water is cooled to 370 DEG C, then Cutting die is heated to 610 DEG C, then water cooling is finally air-cooled to room temperature to 310 DEG C.
7. the Technology for Heating Processing of high rigidity fine etching cutting die as claimed in claim 5, it is characterised in that：The Technology for Heating Processing Comprise the following steps：
(i) etching cutting die is heated to 760 DEG C, is incubated 14 minutes, then air cooling 12 minutes, then cutting die is heated to 660 DEG C, so 460 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 560 DEG C, is incubated 13 minutes, then will etch cutting die using spray form water is cooled to 380 DEG C, then Cutting die is heated to 620 DEG C, then water cooling is finally air-cooled to room temperature to 320 DEG C.
8. the Technology for Heating Processing of high rigidity fine etching cutting die as claimed in claim 5, it is characterised in that：The Technology for Heating Processing Comprise the following steps：
(i) etching cutting die is heated to 770 DEG C, is incubated 17 minutes, then air cooling 13 minutes, then cutting die is heated to 670 DEG C, so 470 DEG C are cooled fast to by compressed air afterwards, room temperature is finally air-cooled to；
(ii) etching cutting die is heated to 570 DEG C, is incubated 14 minutes, then will etch cutting die using spray form water is cooled to 390 DEG C, then Cutting die is heated to 630 DEG C, then water cooling is finally air-cooled to room temperature to 330 DEG C.
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CN201710197048.XA CN106987769B (en) 2017-03-29 2017-03-29 A kind of high rigidity fine etching cutting die
DE202017006865.6U DE202017006865U1 (en) 2017-03-29 2017-12-09 Precise etching cutting tool with high hardness
PCT/CN2017/115356 WO2018176905A1 (en) 2017-03-29 2017-12-09 High-hardness precise etching knife die

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018176905A1 (en) * 2017-03-29 2018-10-04 刘浩 High-hardness precise etching knife die
CN114592108A (en) * 2022-03-11 2022-06-07 深圳市常丰激光刀模有限公司 High-hardness precise engraving cutting die and preparation method thereof

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