CN114713735A - Workbench of die testing press machine and using method thereof - Google Patents
Workbench of die testing press machine and using method thereof Download PDFInfo
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- CN114713735A CN114713735A CN202210527634.7A CN202210527634A CN114713735A CN 114713735 A CN114713735 A CN 114713735A CN 202210527634 A CN202210527634 A CN 202210527634A CN 114713735 A CN114713735 A CN 114713735A
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- workbench
- plate
- die
- ejector
- hole
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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
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/02—Ejecting devices
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
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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
- B21D37/20—Making tools by operations not covered by a single other subclass
Abstract
The invention discloses a workbench of a die testing press and a using method thereof, and the workbench comprises a workbench body, a workbench plate, a supporting plate, a hardening backing plate and a fixing piece, wherein the upper end of the workbench body is provided with the workbench plate, the workbench body is fixedly connected with the workbench plate through the fixing piece, the workbench plate is provided with a material ejecting hole which is vertically matched with a material ejecting rod of a die in a sliding manner, the edge of the workbench plate is provided with an expanding part, the expanding part is provided with the material ejecting hole, the distance between two adjacent material ejecting holes is a, the supporting plate capable of moving up and down is arranged in the workbench body, and the hardening backing plate is completely paved on the supporting plate. The method comprises the steps of transverse adjustment, longitudinal adjustment and transverse and longitudinal adjustment of the working table plate, so that the position of the material ejecting rod on the non-standard die can correspond to the material ejecting hole. The invention can adapt to different moulds by using one workbench, does not need more workbenches, saves cost, improves the working efficiency of the test mould and avoids a plurality of workbenches from occupying too much area.
Description
Technical Field
The invention relates to the technical field of press debugging dies, in particular to a workbench of a die testing press and a using method thereof.
Background
Before the drawing die is put into production formally, the drawing die can be produced formally on a press machine only after being debugged and qualified on the press machine. The press is provided with a workbench which comprises a workbench body 1, a workbench plate 2, a supporting plate 3, a hardening backing plate 4 and a fixing piece 5 as shown in figures 1 and 2. The upper end of the working table body 1 is provided with a working table plate 2, and the working table body 1 is fixedly connected with the working table plate 2 through a fixing piece 5. The working table plate 2 is provided with an ejection hole 21 which is used for being vertically matched with an ejection rod of a die in a sliding mode, the ejection rod is used for providing blank holder force in a pulling and delaying mode or ejecting a stamping part in a lower die out of the die, and the ejection hole 21 is uniformly distributed on the working table plate 2 in the longitudinal direction and the transverse direction. The supporting plate 3 capable of moving up and down is arranged in the workbench body 1, as shown in fig. 3, an air cushion 7 is arranged in the press machine, a piston rod 71 in the air cushion 7 is fixedly provided with a crown 72, the crown 72 is contacted with the lower end surface of the supporting plate 3, when the piston rod 71 extends upwards, the piston rod 71 drives the crown 72 to move upwards, the crown 72 upwards pushes the supporting plate 3, so that the supporting plate 3 moves upwards in the workbench body 1, the supporting plate 3 moving upwards can push the ejector rod 61 upwards, and the ejector rod 61 moves upwards in the ejector hole 21; be equipped with the slider in the press, the slider drives the last mould downstream of installing on the slider, go up the ejector beam 61 in the mould promotion lower mould downwards, ejector beam 61 is in liftout hole 21 downstream, slider and last mould are greater than layer board 3 to the effort of ejector beam 61 this moment, ejector beam 61 can overcome the upward effort of crown 72 to layer board 3 and push down layer board 3, make layer board 3 can be in the workstation body 1 downstream, so, layer board 3 can reciprocate in the workstation body 1. The upper end face of the supporting plate 3 is provided with a hardening backing plate 4 corresponding to the material ejecting hole 21 for protecting the supporting plate 3.
In the standard of 'the distribution form and size of grooves and material ejecting holes for fastening dies of closed presses' standard JB/T3228-2014 in the mechanical industry of the people's republic of China', the positions of the material ejecting holes on the press workbench with different tonnages and different types (single point, double point and four point) are specified, the positions of the material ejecting holes are fixed, and the distance between two adjacent material ejecting holes is fixed.
At present, the mold manufactured in the mold industry needs to meet the requirements of different users, including the manufacture of non-standard molds and other special molds. The positions of the material ejecting rod on the standard die and the material ejecting hole on the working table plate can correspond to each other; the positions of the material ejecting rod on special dies such as non-standard dies and the like and the material ejecting hole on the working table plate cannot correspond, so that different working tables need to be additionally manufactured and replaced in a factory to match different non-standard dies, the weight of the working table on a large-scale press reaches dozens of tons, and the manufacturing cost is extremely high; different moulds are manufactured in a trial mode, different workbenches need to be replaced, and the working efficiency is influenced; meanwhile, different types of workbenches need to be stored on site, so that the floor area of a workshop is increased.
Therefore, how to try to manufacture the mold can save cost, improve working efficiency and reduce occupied area is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the workbench of the die testing press machine and the use method thereof, and the workbench can save cost, improve working efficiency and reduce floor area.
In order to realize the purpose, the invention provides the following technical scheme:
the working table of the die testing press comprises a working table body, a working table plate, a supporting plate, a hardening backing plate and a fixing piece, wherein the working table plate is arranged at the upper end of the working table body, the working table body is fixedly connected with the working table plate through the fixing piece, the working table plate is provided with a material ejecting hole which is used for being in vertical sliding fit with a material ejecting rod of a die, an expanding portion is arranged at the edge of the working table plate and provided with the material ejecting hole, the distance between every two adjacent material ejecting holes is a, the supporting plate capable of moving up and down is arranged inside the working table body, and the hardening backing plate is laid on the supporting plate.
Furthermore, the expanding part comprises a transverse expanding part and a longitudinal expanding part, the transverse edge of the working table plate is provided with the transverse expanding part, the longitudinal edge of the working table plate is provided with the longitudinal expanding part, and the transverse expanding part and the longitudinal expanding part are both provided with the material ejecting hole.
When the longitudinal difference between the position of an ejector rod of the die and the position of an ejector hole is a/2, firstly, the fixing piece is disassembled, then the working table plate is longitudinally pushed on the working table body for a displacement of a/2 length, so that the ejector rod of the die corresponds to the ejector hole, then, the fixing piece is used for fixing the working table plate and the working table body, and finally, the die testing work is carried out.
When the transverse difference between the position of an ejector rod of the die and the position of an ejector hole is a/2, firstly, the fixing piece is disassembled, then the working table plate is pushed transversely on the working table body for a displacement of a/2 length, so that the ejector rod on the die corresponds to the ejector hole, then, the working table plate and the working table body are fixed by the fixing piece, and finally, the die testing work is carried out.
When the transverse difference and the longitudinal difference between the position of an ejector rod of the die and the position of an ejector hole are both a/2, firstly, the fixing piece is disassembled, then the working table plate is transversely pushed on the working table body for a displacement of a/2 length, the working table plate is longitudinally pushed on the working table body for a displacement of a/2 length, the ejector rod on the die corresponds to the ejector hole, then, the fixing piece is used for fixing the working table plate and the working table body, and finally, the die testing work is carried out.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the expansion part is arranged at the edge of the working table plate, the material ejecting holes are arranged on the expansion part, the distance between two adjacent material ejecting holes is a, and the hardening backing plate is fully laid on the supporting plate, so that the position of the material ejecting holes can be adjusted by longitudinally and/or transversely moving the working table plate, and the position of the material ejecting rods on a non-standard die is adapted, therefore, the press workbench disclosed by the invention not only can adapt to the debugging of a standard die, but also can adapt to the debugging of a non-standard die, and the use flexibility of the press workbench is improved. Need not to make in addition and change the workstation that corresponds in order to match each kind of nonstandard mould, the cost is reduced.
2. The workbench provided by the invention can adjust the position of the workbench plate in the workbench according to the position of the ejector rod of the trial-manufactured non-standard die, so that the position of the ejector rod of the non-standard die is consistent with the position of the ejector hole, and the trial-manufacturing can be started by placing the corresponding non-standard die.
3. The workbench provided by the invention can meet the requirements of testing different non-standard dies, so that only one workbench is needed, compared with the background art, a plurality of workbenches are not needed for testing different non-standard dies, and the floor area of a workshop is reduced.
Drawings
FIG. 1 is a schematic view of a prior art platen;
FIG. 2 is a schematic diagram of a stage of a press according to the prior art;
FIG. 3 is a diagram of a table and an air cushion of a press in the prior art;
FIG. 4 is a schematic structural view of a work table in accordance with embodiment 1;
FIG. 5 is a schematic structural view of a table of a trial press according to example 1;
FIG. 6 is a first schematic view showing the position of the ejector pin of the non-standard mold according to example 3;
FIG. 7 is a second schematic view showing the position of the ejector pin of the nonstandard mold in example 3;
fig. 8 is a third schematic position diagram of the ejector pin of the non-standard die in embodiment 3.
In the figure:
1-a working table body is arranged on the working table body,
2-a working table plate, 21-a material ejecting hole, 22-a transverse expansion part, 23-a longitudinal expansion part,
3-a supporting plate, wherein the supporting plate is provided with a plurality of supporting plates,
4-hardening the base plate by quenching,
5-a fixing part is arranged on the upper surface of the frame,
6-non-standard die, 61-ejector pin,
7-air cushion, 71-piston rod, 72-crown.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 4 and 5, a table of a mold testing press comprises a table body 1, a table plate 2, a supporting plate 3, a hardening liner plate 4 and a fixing piece 5.
The table plate 2 can be fixed on the upper end surface of the table body 1 by fixing members 5 such as bolts and positioning pins.
The working table plate 2 is provided with a plurality of material ejection holes 21, the material ejection holes 21 are used for being in vertical sliding fit with material ejection rods of the die, and the material ejection holes 21 are uniformly distributed on the working table plate 2 along the transverse direction and the longitudinal direction.
The working table plate 2 is of a rectangular plate structure, so that four edges are arranged on the working table plate 2, the four edges can be divided into a front side edge, a rear side edge, a left side edge and a right side edge, the front side edge and the rear side edge can be collectively called as a transverse edge, and the left side edge and the right side edge can be collectively called as a longitudinal edge.
The edge of the working table plate 2 is provided with an expanding part, and the expanding part and the working table plate 2 are of an integral structure. The expansion portion may be provided only on at least any one of the four edges of the work board 2. The expansion part is also provided with a plurality of material ejecting holes 21, and the material ejecting holes 21 can be only transversely and uniformly distributed on the expansion part, also can be only longitudinally and uniformly distributed, and also can be transversely and longitudinally and uniformly distributed.
In the present embodiment, the expansion includes a lateral expansion 22 and a longitudinal expansion 23, the lateral expansion 22 is disposed on a lateral edge of the workbench plate 2, and the longitudinal expansion 23 is disposed on a longitudinal edge of the workbench plate 2. The transverse expansion part 22 and the longitudinal expansion part 23 are provided with a plurality of jacking holes 21.
The distance between two adjacent top material holes 21 is a, and a refers to a positive number value except zero. In this embodiment, the value of a is 150 mm.
The inside of the worktable body 1 is provided with a supporting plate 3, and the supporting plate 3 can move up and down in the worktable body 1. Specifically, as shown in fig. 3, an air cushion 7 is arranged in the press machine, a piston rod 71 in the air cushion 7 is fixedly provided with a crown 72, the crown 72 is in contact with the lower end surface of the supporting plate 3, when the piston rod 71 extends upwards, the piston rod 71 drives the crown 72 to move upwards, the crown 72 pushes the supporting plate 3 upwards, so that the supporting plate 3 moves upwards in the worktable body 1, and the supporting plate 3 moving upwards can push the ejector rod 61 upwards, so that the ejector rod 61 moves upwards in the ejector hole 21; be equipped with the slider in the press, the slider drives the last mould downstream of installing on the slider, go up the ejector beam 61 in the mould pushing down lower mould, ejector beam 61 moves down in liftout hole 21, the slider is greater than layer board 3 to ejector beam 61's effort with last mould to ejector beam 61's effort this moment, ejector beam 61 can overcome crown 72 and push down layer board 3 to the effort that makes progress of layer board 3, make layer board 3 can be in the workstation body 1 rebound, so, layer board 3 can reciprocate in the workstation body 1.
The upper end face of the supporting plate 3 is fully paved with a hardening backing plate 4, and the hardening backing plate 4 is used for protecting the supporting plate 3. Specifically, if no hardening backing plate 4 is arranged on the upper end face of the supporting plate 3, the supporting plate 3 is easy to damage under the impact of the ejector rod of the die, the service life of the supporting plate 3 is shortened, the cost for maintaining and replacing the supporting plate 3 is increased, the setting of the hardening backing plate 4 can improve the impact strength of the ejector rod of the die on the supporting plate 3, and the service life of the supporting plate 3 is prolonged. Furthermore, the reason why the hardening backing plates 4 are fully laid on the upper end surfaces of the supporting plates 3 is to enable the fully laid hardening backing plates 4 to adapt to the positions of the ejector rods of the molds with changed positions when the positions of the ejector holes 21 on the work bench 2 are changed, so that the flexibility of adjusting the work bench 2 is improved.
In addition, in the prior art, in order to save cost, the factory would eliminate the support plate 3 and install the hardening backing plate 4 directly on the crown 72 corresponding to the topping hole 21. In this case, the hardening mat 4 is laid directly on the crown 72 over the entire surface without the pallet 3.
Example 2:
the molds include standard molds and non-standard molds 6.
When the table of the trial mold press according to embodiment 1 is used to try a standard mold, since the positions of the ejector pins on the marked mold are standard (the distance between two adjacent ejector pins on the standard mold is a, and the position distribution of the ejector pins on the standard mold is the same as the position distribution of the ejector holes 21 on the work platen 2), the ejector holes 21 on the work platen 2 are sufficient to fit the ejector pins of the standard mold, so that the position of the work platen 2 does not need to be moved.
Specifically, the method of use when using the table of the trial press of example 1 to trial manufacture a standard die is as follows: a worker directly puts the standard die on the workbench and starts the press machine to test the die.
Example 3:
if the non-standard die 6 needs to be tried, and the position of the ejector pins 61 in the non-standard die 6 and the position of the ejector holes 21 on the work table 2 do not correspond, the work table 2 needs to be moved.
In the case of one, the position of the ejector pin 61 on the non-standard die 6 is different from the position of the ejector hole 21 by a/2 (i.e., 75 mm) in the longitudinal direction, and the position of the ejector pin 61 on the non-standard die 6 coincides with the position of the ejector hole 21 in the lateral direction. For example, as shown in fig. 6, the ejector rods 61 on the non-standard die 6 are distributed on a horizontal center line, the ejector rods 61 on the non-standard die 6 are symmetrically distributed with the horizontal center line and the vertical center line as a symmetry line, and the distance between two adjacent ejector rods 61 on the non-standard die 6 is a; as shown in fig. 3, the ejection holes 21 on the work table 2 are not distributed on the horizontal center line, and the ejection holes 21 on the work table 2 are symmetrically distributed with the horizontal center line and the vertical center line as a symmetry line, and comparing the position of the ejection rod 61 on the non-standard die 6 with the position of the ejection hole 21 on the work table 2, it can be seen that the difference between the position of the ejection rod 61 on the non-standard die 6 and the ejection hole 21 is a/2 in the longitudinal direction, and the position of the ejection rod 61 on the non-standard die 6 is identical to the position of the ejection hole 21 in the transverse direction.
The method of using a table of a trial press of embodiment 1 includes the steps of: firstly, a worker unloads a fixing piece 5 for fixing the work table plate 2 and the work table body 1; then, the worker longitudinally pushes the working table plate 2 on the working table body 1 for 75mm of displacement, so that the position of the ejector rod 61 on the non-standard die 6 can be correspondingly matched with the ejector hole 21; then, the worker fixes the work board 2 and the work body 1 using the fixing member 5; and finally, starting the press machine to perform die testing work.
In the second case, the position of the ejector pin 61 on the non-standard die 6 is laterally different from the position of the ejector hole 21 by a/2 (i.e., 75 mm), and the position of the ejector pin 61 on the non-standard die 6 is longitudinally identical to the position of the ejector hole 21. For example, as shown in fig. 7, the ejector rods 61 on the non-standard die 6 are distributed on a vertical center line, the ejector rods 61 on the non-standard die 6 are symmetrically distributed with a horizontal center line and a vertical center line as a symmetry line, and a distance between two adjacent ejector rods 61 on the non-standard die 6 is a; as shown in fig. 3, the ejection holes 21 on the work bench 2 are not distributed on the vertical center line, and the ejection holes 21 on the work bench 2 are symmetrically distributed with the horizontal center line and the vertical center line as the symmetry line, and comparing the position of the ejection rod 61 on the non-standard die 6 with the position of the ejection hole 21 on the work bench 2, it can be seen that the difference between the position of the ejection rod 61 on the non-standard die 6 and the ejection hole 21 is a/2 in the lateral direction, and the position of the ejection rod 61 on the non-standard die 6 is identical to the position of the ejection hole 21 in the longitudinal direction.
The method for using the workbench of the die testing press in the embodiment 1 comprises the following steps: firstly, a worker unloads a fixing piece 5 for fixing the work table plate 2 and the work table body 1; then, the worker pushes the working table plate 2 on the working table body 1 transversely for a displacement of 75mm in length, so that the position of the ejector rod 61 on the non-standard die 6 can be correspondingly matched with the ejector hole 21; then, the worker fixes the work board 2 and the work body 1 again using the fixing member 5; and finally, starting a press machine to perform die testing work.
Case three: the position of the ejector pins 61 on the non-standard die 6 is a/2 difference from the ejector holes 21 in the lateral direction, and the position of the ejector pins 61 on the non-standard die 6 is a/2 difference from the ejector holes 21 in the longitudinal direction. For example, as shown in fig. 8, the ejector pins 61 on the non-standard mold 6 are distributed not only on the horizontal center line but also on the vertical center line, the ejector pins 61 on the non-standard mold 6 are symmetrically distributed with the horizontal center line and the vertical center line as a symmetry line, and the distance between two adjacent ejector pins 61 on the non-standard mold 6 is a; as shown in fig. 3, the ejection holes 21 on the work bench 2 are not distributed on the horizontal center line and the vertical center line, and the ejection holes 21 on the work bench 2 are symmetrically distributed with the horizontal center line and the vertical center line as a symmetric line, and comparing the positions of the ejection rods 61 on the non-standard die 6 with the positions of the ejection holes 21 on the work bench 2, it can be seen that the positions of the ejection rods 61 on the non-standard die 6 are different from the ejection holes 21 by a/2 in the transverse direction, and the positions of the ejection rods 61 on the non-standard die 6 are different from the ejection holes 21 by a/2 in the longitudinal direction.
The method of using a table of a trial press of embodiment 1 includes the steps of: firstly, a worker unloads a fixing piece 5 for fixing the work table plate 2 and the work table body 1; then, a worker pushes the working table plate 2 on the working table body 1 transversely for a displacement of 75mm in length, and pushes the working table plate 2 on the working table body 1 longitudinally for a displacement of 75mm in length, so that the position of the ejector rod 61 on the non-standard die 6 can be correspondingly matched with the ejector hole 21; then, the worker fixes the work board 2 and the work body 1 again using the fixing member 5; and finally, starting the press machine to perform die testing work.
Through the use of this embodiment 3, can know, set up the extension portion through the border at work platen 2, set up liftout hole 21 in the extension portion, and let the interval of two adjacent liftout holes 21 be a, and lay quench hardening backing plate 4 on layer board 3 comprehensively, can adjust the position of liftout hole 21 through vertical and/or lateral shifting work platen 2, come to adapt to the position of the liftout pole on the nonstandard mould 6, thereby let the press workstation of this embodiment not only can adapt to the debugging of standard mould, can also adapt to the debugging of nonstandard mould 6, the use flexibility of press workstation has been improved. The corresponding workbench is not required to be manufactured and replaced for matching each non-standard die 6, and cost is saved.
In addition, the working table provided by this embodiment can adjust the position of the working table plate 2 in the working table according to the position of the ejector pin of the non-standard die 6 to be trial-manufactured, so that the position of the ejector pin of the non-standard die 6 is consistent with the position of the ejector hole 21, and the die test can be started by placing the corresponding non-standard die 6.
Moreover, the workbench provided by the embodiment can meet the requirements of different non-standard dies 6 for trial molding, so that only one workbench is needed, compared with the background art, a plurality of workbenches are not needed for trial production of different non-standard dies 6, and the floor area of a workshop is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The workbench of the mold testing press comprises a workbench body, a workbench plate, a supporting plate, a hardening backing plate and a fixing piece, wherein the upper end of the workbench body is provided with the workbench plate, the workbench body is fixedly connected with the workbench plate through the fixing piece, the workbench plate is provided with a material ejecting hole which is used for being vertically matched with a material ejecting rod of a mold in a sliding mode, the supporting plate capable of moving up and down is arranged inside the workbench body, and the hardening backing plate is arranged on the upper end face of the supporting plate.
2. The workbench of a mold press according to claim 1, wherein the extension comprises a transverse extension and a longitudinal extension, the transverse edge of the workbench plate is provided with the transverse extension, the longitudinal edge of the workbench plate is provided with the longitudinal extension, and the transverse extension and the longitudinal extension are both provided with the ejection hole.
3. The method as claimed in claim 2, wherein when the longitudinal difference between the position of the ejector pin of the die and the position of the ejector hole is a/2, the fixing member is first removed, the table plate is then pushed longitudinally on the table body by a displacement of a/2 length to make the ejector pin of the die correspond to the ejector hole, and then the fixing member is used to fix the table plate and the table body, and finally the die testing operation is performed.
4. The method of using the table of the trial mold press as claimed in claim 2, wherein when the position of the ejector pin of the mold is laterally different from the position of the ejector hole by a/2, the fixing member is first removed, the table plate is then laterally pushed on the table body by a displacement of a/2 length so that the ejector pin of the mold corresponds to the ejector hole, the table plate and the table body are then fixed using the fixing member, and finally the trial mold work is performed.
5. The method as claimed in claim 2, wherein when the lateral and longitudinal differences between the position of the ejector pin of the die and the position of the ejector hole are both a/2, the fixing member is first removed, the table plate is then pushed laterally on the table body by a displacement of a/2 length, the table plate is pushed longitudinally on the table body by a displacement of a/2 length, the ejector pin of the die corresponds to the ejector hole, the table plate and the table body are then fixed by the fixing member, and finally the die testing operation is performed.
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| CN202210527634.7A CN114713735B (en) | 2022-05-16 | 2022-05-16 | Workbench of die testing press machine and using method thereof |
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| CN202210527634.7A CN114713735B (en) | 2022-05-16 | 2022-05-16 | Workbench of die testing press machine and using method thereof |
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| CN114713735B CN114713735B (en) | 2022-08-26 |
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| CN114713735B (en) | 2022-08-26 |
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