CN105880385A - Hot-stamping die and hot-stamping machining method - Google Patents
Hot-stamping die and hot-stamping machining method Download PDFInfo
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- CN105880385A CN105880385A CN201610300587.7A CN201610300587A CN105880385A CN 105880385 A CN105880385 A CN 105880385A CN 201610300587 A CN201610300587 A CN 201610300587A CN 105880385 A CN105880385 A CN 105880385A
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- metal blank
- drift
- hot stamping
- die
- upper bolster
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a hot-stamping die. The hot-stamping die comprises a fixedly-arranged lower die seat and an upper die seat capable of moving up and down, wherein a concave die cavity with an opening at the top is formed in the lower die seat; a stamping head which directly faces the concave die cavity is arranged at the bottom of the upper die seat; a blank holder is arranged around the stamping head, and connected to the bottom of the upper die seat through first elastic connecting pieces; the first elastic connecting pieces can be elastically extended or retracted up and down; a heat conducting block is arranged in the concave die cavity, and connected to the bottom of the concave die cavity through a second elastic connecting piece; and the second elastic connecting pieces can be elastically extended or retracted up and down. During a stamping process, the upper and lower surfaces of all the areas of a metal sheet can be cooled, so that all the areas of the metal sheet can be uniformly cooled, and then the mechanical property consistency of parts prepared from the metal sheet can be improved.
Description
Technical field
The present invention relates to a kind of hot stamping die and drop stamping processing method, the drop stamping for metal blank is processed.
Background technology
Super-high strength steel hot forming technique refers to be heated to AHSS plate (generally boracic steel plate) austenitizing temperature and after fully insulation makes austenite homogenization, steel plate is quickly moved to low temperature mould, completing stamping to realize pressurize quenching in mould, the final tissue morphology intensity based on martensite that obtains reaches the super-high strength steel product of about 1500MPa simultaneously.The advantage of drop stamping technique is that required forming pressure is little, and gained product intensity is high, and product springback capacity is much smaller than cold punching technology.
Quenching in realizing mould while completing punching press action is hot press-formed valuable feature, only when the rate of cooling of high temperature plate is more than certain marginal value (for most drop stamping boron steels, this marginal value is about 27 DEG C/s), austenite just can be fully converted to martensite, and product can show high intensity.For making plate obtain high rate of cooling, except needs shorten plate transfer and mould burn close time, and design outside effective cooling system reduction mold temperature, also need to guarantee to be fully contacted between plate and mould, to make plate heat fast transfer to mould, thus realize fast cooling.The workpiece obtaining excellent performance is had great importance by this.
And during current drop stamping component shaping, limited by conventional ones mould structure, in starting the long period of time before being formed into mould Guan Bi, as shown in Figure 1, the edge of high temperature plate is pressed on die by blank holder, during punch moves downward, the bottom surface of the drift of punch and the upper surface of plate, and matrix cavity just to the lower surface of plate be in vacant state, until punch and die of completely closed after, matrix cavity institute just to plate lower surface ability contact with the bottom surface of matrix cavity.Compare, except matrix cavity just to region in addition to all omnidistance ground, other region (including flanging and sidewall etc.) of plate two-sided with punch and die contact, the upper and lower surface of the plate in these regions is all cooled, and matrix cavity just to the plate only upper surface in region contact with the bottom surface of drift, cooldown rate is significant lower, it is unfavorable for quenching hardening, and then affects the mechanical performance at this position.
And, during existing hot stamping forming die stamped metal plate, blank holder was first pushed down plate before drift contacts with metal blank and applies certain pressure-pad-force.For cold punching, this way can effectively prevent plate from producing wrinkling defect in forming process.But for drop stamping, blank holder is pressed down and is applied pressure-pad-force too early and means that this zone plate material temperature degree declines comparatively fast, and quenching effect is better than other region.On the one hand, thus cause the material flowability with blank holder contact area of metal blank to decline, be unfavorable for that material flows to die internal shaping；On the other hand, shaped the final intensity in rear flanging region and hardness is higher, and this region has usually finally needed to cut away, thus intensity and hardness are the highest, the most unfavorable to subsequent handling.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of hot stamping die and drop stamping processing method, to in metal blank hot stamping operation, each region of metal blank can be cooled down uniformly, thus improves the mechanical performance of made part.
For achieving the above object and other relevant purposes, the present invention provides a kind of hot stamping die, adopt the following technical scheme that a kind of hot stamping die, including the die shoe being fixedly installed and upper bolster moving up and down, die shoe is provided with open-topped matrix cavity, and the bottom of upper bolster is provided with just drift to matrix cavity；Described drift is provided around blank holder, and blank holder is connected to the bottom of upper bolster by the first Flexible Connector, and the first Flexible Connector can elastic telescopic up and down；Being provided with heat-conducting block in described matrix cavity, heat-conducting block is connected to the bottom of matrix cavity by the second Flexible Connector, and the second Flexible Connector can elastic telescopic up and down.
Further, described first Flexible Connector and the second Flexible Connector are spring.
Further, the lower surface of described blank holder is less than the lower surface of drift.
Further, described upper bolster is driven by servo press.
Further, being provided with by hole in the middle of described blank holder, the cross section of described drift takes the shape of the letter U, the U-shaped cross-sections match by hole Yu drift in the middle of blank holder.
Further, the side of described heat-conducting block and the snug engagement of matrix cavity.
Further, described upper bolster and/or die shoe are provided with cooling water channel
With above-mentioned a kind of hot stamping die correspondingly, the present invention also provides for a kind of drop stamping processing method, adopts the following technical scheme that a kind of drop stamping processing method, uses hot stamping die as claimed in claim 1, comprise the steps:
1) drop stamping metal blank is placed in heating furnace it is heated to more than austenitizing temperature, and chien shih metal blank austenitizing when being incubated setting；
2) after the abundant austenitizing of metal blank, plate being transferred to carry out on hot stamping die punching press, metal blank is placed on die shoe end face and covers on the opening at matrix cavity top, in punching course:
A) upper bolster moves downward, blank holder first with the upper surface at metal blank edge and metal blank is pressed on the upper surface of upper bolster；
B) after step a), upper bolster continues to move downward, and the lower surface of drift and the upper surface of metal blank, meanwhile, the upper surface of heat-conducting block contacts with the lower surface of metal blank；
C) after step b), upper bolster stops after continuing to move downwardly to setting position and keeps a period of time set, and makes the part utilizing metal blank machine-shaping pressurize quenching in matrix cavity；
3) take out part, enter subsequent processing stage.
As mentioned above, a kind of hot stamping die of the present invention, have the advantages that the hot stamping die of the present invention is when punching press, when upper bolster moves downwardly to the upper surface that metal blank pressed close to by drift, the edge of metal blank is pressed on die shoe by blank holder, so the upper and lower surface of the edge of metal blank all can be cooled down；The bottom surface of drift and the upper surface of metal blank, owing to being provided with heat-conducting block and secondary connector in the matrix cavity of die shoe, heat-conducting block is connected to the bottom of matrix cavity by the second Flexible Connector, during drift is by downward for metal blank punching press, heat-conducting block is held out against on the lower surface of metal blank by the second Flexible Connector, so, drift and heat-conducting block are attached in the upper and lower surface of metal blank respectively, so that the upper and lower surface in the region with punch. contact of metal blank also is able to be cooled down；So, the upper and lower surface in all regions of metal blank all can be cooled down, so, each region of metal blank can be cooled down uniformly, thus improves the concordance of the mechanical performance of made part.Correspondingly, the drop stamping processing method of the present invention also has the effect above, and here is omitted.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram of conventional ones mould.
Fig. 2 is shown as the structural representation of the hot stamping die of the embodiment of the present invention.
Fig. 3 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, and drift is in highest position.
Fig. 4 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, drift and the state of metal blank upper surface moment.
Fig. 5 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, the lower surface of metal blank and the state of heat-conducting block Contact.
Fig. 6 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, and drift is in its lowest position.
Reference is as follows:
1 upper bolster 7 metal blank
2 drift 8 die shoes
3 blank holder 9 matrix cavity
4 pass through hole 10 heat-conducting block
5 first Flexible Connector 11 second Flexible Connectors
6 fairlead 12 guide posts
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be understood other advantages and effect of the present invention easily by the content disclosed by this specification.The present invention can also be carried out by the most different detailed description of the invention or apply, and the every details in this specification can also carry out various modification or change based on different viewpoints and application under the spirit without departing from the present invention.
Fig. 2 is shown as the structural representation of the hot stamping die of the embodiment of the present invention, refer to Fig. 2, the present invention provides a kind of hot stamping die, including the die shoe 8 being fixedly installed and upper bolster moving up and down 1, die shoe 8 is provided with open-topped matrix cavity 9, and the bottom of upper bolster 1 is provided with just drift 2 to matrix cavity 9；Described drift 2 is provided around blank holder 3, and blank holder 3 is connected to the bottom of upper bolster 1 by the first Flexible Connector 5, and the first Flexible Connector 5 can elastic telescopic up and down；Being provided with heat-conducting block 10 in described matrix cavity 9, heat-conducting block 10 is connected to the bottom of matrix cavity 9 by the second Flexible Connector 11, and the second Flexible Connector 11 can elastic telescopic up and down.The hot stamping die of the present invention is when punching press, and when upper bolster 1 moves downwardly to the upper surface that metal blank 7 pressed close to by drift 2, the edge of metal blank 7 is pressed on die shoe 8 by blank holder 3, so the upper and lower surface of the edge of metal blank 7 all can be cooled down；The bottom surface of drift 2 and the upper surface of metal blank 7, owing to being provided with heat-conducting block 10 and secondary connector in the matrix cavity 9 of die shoe 8, heat-conducting block 10 is connected to the bottom of matrix cavity 9 by the second Flexible Connector 11, during drift 2 is by downward for metal blank 7 punching press, heat-conducting block 10 is held out against on the lower surface of metal blank 7 by the second Flexible Connector 11, so, drift 2 and heat-conducting block 10 are attached in the upper and lower surface of metal blank 7 respectively, so that the upper and lower surface in the region contacted with drift 2 of metal blank 7 also is able to be cooled down；So, the upper and lower surface in all regions of metal blank 7 all can be cooled down, so, each region of metal blank 7 can be cooled down uniformly, thus improves the concordance of the mechanical performance of made part.It should be noted that in a kind of hot stamping die of the present invention, the second Flexible Connector provides the thrust being applied to metal blank lower surface for heat-conducting block, make heat-conducting block keep contacting with the lower surface of metal blank, but the molding on plate there is no impact.
Spring as a kind of can the Flexible Connector of axial stretching, there is good elastic performance, and be prone to make, cost is relatively low, it is preferable that as shown in Figure 2, in a kind of hot stamping die of the present invention, the first Flexible Connector 5 and the second Flexible Connector 11 are spring.When stamped metal plate 7, upper bolster 1 rapidly downwardly moves and makes drift 2 that metal blank 7 is pressed into matrix cavity 9, when drift 2 to setting position, upper bolster 1 stop motion makes drift 2 be maintained at setting position, in order to accurately control the motion of upper bolster 1, it is ensured that drift 2 can accurately stop at setting position, preferably, upper bolster 1 is driven by servo press, accurate control volume under pressure precision to 0.1mm.
When designing hot stamping die, design according to the overall dimensions of mould, determine heat-conducting block 10 and the size of spring being connected with heat-conducting block 10；According to the dimensional requirement of the product wanting punching press, selecting the compression spring in corresponding elastic range, heat-conducting block 10 to be connected on spring, the upper surface of heat-conducting block 10 should be concordant with the upper surface of die shoe 8；Concordant with the lower surface of drift 2 or slightly below drift 2 the lower surface of the lower surface of blank holder 3.Fig. 3 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, drift is in highest position, Fig. 4 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, drift and the state of metal blank upper surface moment, Fig. 5 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, the lower surface of metal blank and the state of heat-conducting block Contact, Fig. 6 is shown as utilizing the schematic diagram of the hot stamping die processing metal blank of the present invention, and drift is in its lowest position.As shown in Figure 3, when the hot stamping die utilizing the present invention carries out punch process, after metal blank 7 takes out in high temperature furnace, it is placed on rapidly on die shoe 8, the lower surface of metal blank 7 contacts with die shoe 8 and heat-conducting block 10, so the lower surface cooling of metallic plate is uniformly, then upper bolster 1 moves downward, as shown in Figure 4, contact with metal blank 7 while that drift 2 being with blank holder 3 (or blank holder 3 contacts with metal blank 7 slightly before drift 2, the pressure that now blank holder 3 is applied on metal blank 7 is the least, the temperature of metal blank 7 declines unhappy), so the upper surface of metal blank 7 also cools down uniformly；Upper bolster 1 continues to move downward, as it is shown in figure 5, metal blank 7 deforms, each region of metal blank 7 remains and mould double contact, as shown in Figure 6, the setting position of drift 2 motion also stops, and the part of metal blank 7 molding completes pressurize quenching in matrix cavity 9.
In order to make the overall structure between drift 2 and blank holder 3 more stable, as in figure 2 it is shown, can be provided with by hole in the middle of blank holder, the cross section of described drift takes the shape of the letter U, the U-shaped cross-sections match by hole Yu drift in the middle of blank holder.Heat-conducting block 10 moves up and down in matrix cavity 9, in order to make the heat-conducting block 10 motion in matrix cavity 9 more steady, heat-conducting block 10 can be arranged to the snug engagement of the shape matched with matrix cavity 9, the side of heat-conducting block 10 and matrix cavity 9.Fairlead 6 can also be set on upper bolster 1, arranging guide post 12 on die shoe 8, guide post 12 is slidably matched with fairlead 6, when upper bolster 1 moves up and down, upper bolster 1 can be played guide effect by guide post 12 and fairlead 6, and the motion making upper bolster 1 is more steady.
In order to make the rate of cooling of metal blank 7 faster, cooling water channel can be set on upper bolster 1 and/or die shoe 8, in cooling water channel, be passed through coolant, the cooling of metal blank 7 can be accelerated.
A kind of hot stamping die based on the above-mentioned present invention, the method that a kind of drop stamping utilizing the present invention is processed by we below illustrates, a kind of drop stamping processing method of the present invention uses a kind of hot stamping die of the above-mentioned present invention, and drop stamping processing method provided by the present invention includes following steps:
1) drop stamping metal blank 7 is placed in heating furnace it is heated to more than austenitizing temperature, and chien shih metal blank 7 austenitizing when being incubated setting；
2) after the abundant austenitizing of metal blank 7, plate being transferred to carry out on hot stamping die punching press, metal blank 7 is placed on die shoe 8 end face and covers on the opening at matrix cavity 9 top, in punching course:
A) upper bolster 1 moves downward, blank holder 3 first with the upper surface at metal blank 7 edge and metal blank 7 is gently pressed solidly on the upper surface being scheduled on upper bolster 1, now pressure-pad-force is less, and the coefficient of heat transfer of flanging and plate is relatively low.The stroke moved downward with upper bolster becomes big, and pressure-pad-force increases, and plate rate of cooling increases；
B) after step a), upper bolster 1 continues to move downward, and the lower surface of drift 2 and the upper surface of metal blank 7, meanwhile, the upper surface of heat-conducting block 10 contacts with the lower surface of metal blank 7；
C) after step b), upper bolster 1 stops after continuing to move downwardly to setting position and keeps a period of time set, and makes the part utilizing metal blank 7 machine-shaping pressurize quenching in matrix cavity 9；
3) take out part, enter subsequent processing stage.
Above-mentioned steps 1) in the setting time be to ensure that time of metal blank 7 austenitizing, be that those skilled in the art determine according to practical situation, after austenitizing, metal blank 7 original ferrite and pearlite structural transformation is austenite structure.
In above-mentioned steps 2, started to be deformed into deformation from metal blank 7 by drift 2 punching press to complete and during pressurize quenching in matrix cavity 9, the upper surface of metal blank 7 contacts with the lower surface of lower surface, the side of drift 2 and the blank holder 3 of drift 2, and the lower surface of metal blank 7 and the upper surface of die shoe 8, the sidewall of matrix cavity 9 and the upper surface of heat-conducting block 10, so, the Zone Full of metal blank 7 upper and lower surface is uniformly cooled.
In sum, a kind of hot stamping die and the drop stamping processing method that utilize the present invention carry out drop stamping processing and have the advantages that
(1) regional of metal blank 7 all can be with mould double contact in forming process, it is ensured that metal blank 7 entirety has uniform rate of cooling, thus realizes the uniformity of final manufactured product mechanical performance.
(2) designing for traditional moulds, if actual effect does not meets design requirement, or owing to the factors such as abrasion cause properties of product not to be inconsistent, it is generally required to repeatedly repair a die, experiment process is the longest.In a kind of hot-working mould of the present invention, the design and installation of blank holder 3 and heat-conducting block 10 are all very convenient, can install the most at any time, dismantle and even change, the most flexibly.
(3) a kind of hot-working mould of the present invention is equipped with servo press, it is possible to achieve the most arbitrarily regulating of volume under pressure.In scientific experiments or product pilot process, it usually needs the test drift 2 forming property when different volumes under pressure.Traditional mould typically requires the many molds of preparation can realize this function.Owing to this method devises the heat-conducting block 10 being connected in matrix cavity 9 by spring, it can be ensured that metal blank 7 shape each position with each stage of pressurize all with mould double contact, there is preferable rate of cooling.Therefore it is combined with servo press and can freely control the feature of drift 2 stroke, to volume under pressure arbitrary in spring range, all can realize on same mould.
(4) this method motility is high, it is adaptable to the main shaping dies such as bending die, Drawing Die.And owing to have employed the heat-conducting block 10 being connected in matrix cavity 9 by spring, a kind of hot stamping die of the present invention can use single action press or double dynamic compressor to drive.
(5) during drift 2 moves downward, the spring pressure of the spring being connected with heat-conducting block 10 is as the increase of volume under pressure and linearly increasing, thus the cooling rate (being directly proportional to the pressure) in region that metal blank 7 contacts with heat-conducting block 10 is also gradually increased.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by any person skilled in the art.Therefore, art has all equivalence modification or changes that usually intellectual is completed under without departing from disclosed spirit and technological thought such as, must be contained by the claim of the present invention.
Claims (8)
1. a hot stamping die, including the die shoe being fixedly installed and upper bolster moving up and down, die shoe is provided with top and opens
Mouthful matrix cavity, the bottom of upper bolster is provided with just drift to matrix cavity；It is characterized in that:
Described drift is provided around blank holder, and blank holder is connected to the bottom of upper bolster by the first Flexible Connector, and the first elasticity is even
Fitting can elastic telescopic up and down；
Being provided with heat-conducting block in described matrix cavity, heat-conducting block is connected to the bottom of matrix cavity by the second Flexible Connector, and the second elasticity is even
Fitting can elastic telescopic up and down.
2. hot stamping die as claimed in claim 1, is characterized in that: described first Flexible Connector and the second Flexible Connector are equal
For spring.
3. hot stamping die as claimed in claim 1, is characterized in that: the lower surface of described blank holder is less than the lower surface of drift.
4. hot stamping die as claimed in claim 1, is characterized in that: described upper bolster is driven by servo press.
5. hot stamping die as claimed in claim 1, is characterized in that: be provided with by hole in the middle of described blank holder, described drift
Cross section takes the shape of the letter U, the U-shaped cross-sections match by hole Yu drift in the middle of blank holder.
6. hot stamping die as claimed in claim 1, is characterized in that: the side of described heat-conducting block is joined with the side walls of matrix cavity
Close.
7. hot stamping die as claimed in claim 1, is characterized in that: described upper bolster and/or die shoe are provided with cooling water channel.
8. a drop stamping processing method, is characterized in that, uses hot stamping die as claimed in claim 1, comprises the steps:
1) drop stamping metal blank is placed in heating furnace it is heated to more than austenitizing temperature, and be incubated setting
Time chien shih metal blank austenitizing；
2), after the abundant austenitizing of metal blank, plate is transferred to carry out on hot stamping die punching press, metal blank
It is placed on die shoe end face and covers on the opening at matrix cavity top, in punching course:
A) upper bolster moves downward, blank holder first with the upper surface at metal blank edge and by metal blank pressure
On the upper surface of upper bolster；
B) after step a), upper bolster continues to move downward, the lower surface of drift and the upper surface of metal blank
Contact, meanwhile, the upper surface of heat-conducting block contacts with the lower surface of metal blank；
C) after step b), upper bolster stops after continuing to move downwardly to setting position and keeps a section set
Time, make the part utilizing metal blank machine-shaping pressurize quenching in matrix cavity；
3) take out part, enter subsequent processing stage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610300587.7A CN105880385A (en) | 2016-05-09 | 2016-05-09 | Hot-stamping die and hot-stamping machining method |
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| CN201610300587.7A CN105880385A (en) | 2016-05-09 | 2016-05-09 | Hot-stamping die and hot-stamping machining method |
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| CN105880385A true CN105880385A (en) | 2016-08-24 |
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| CN109530519A (en) * | 2018-12-29 | 2019-03-29 | 东莞市豪斯特热冲压技术有限公司 | A kind of mold and method for the production of deep drawn part |
| CN116689589A (en) * | 2023-08-04 | 2023-09-05 | 西安交通大学医学院第一附属医院 | Stamping equipment is used in medical instrument processing |
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| CN107252841B (en) * | 2017-06-30 | 2019-04-26 | 太仓市华天冲压五金制品厂 | A kind of heating process for stamping of machining high-precision protrusion |
| CN109047513A (en) * | 2018-05-31 | 2018-12-21 | 浙江智造热成型科技有限公司 | The bindiny mechanism of lower mold body and guide post in thermoforming stamping die |
| CN109530519A (en) * | 2018-12-29 | 2019-03-29 | 东莞市豪斯特热冲压技术有限公司 | A kind of mold and method for the production of deep drawn part |
| CN116689589A (en) * | 2023-08-04 | 2023-09-05 | 西安交通大学医学院第一附属医院 | Stamping equipment is used in medical instrument processing |
| CN116689589B (en) * | 2023-08-04 | 2023-11-07 | 西安交通大学医学院第一附属医院 | Stamping equipment is used in medical instrument processing |
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Application publication date: 20160824 |