CN110091122A - A kind of repair apparatus and method for repairing and mending of mold localized cracks - Google Patents
A kind of repair apparatus and method for repairing and mending of mold localized cracks Download PDFInfo
- Publication number
- CN110091122A CN110091122A CN201910320536.4A CN201910320536A CN110091122A CN 110091122 A CN110091122 A CN 110091122A CN 201910320536 A CN201910320536 A CN 201910320536A CN 110091122 A CN110091122 A CN 110091122A
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- Prior art keywords
- mortise
- mold
- localized cracks
- repair apparatus
- insert
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010892 electric spark Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 16
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 235000013547 stew Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention provides the repair apparatus and method of a kind of mold localized cracks, and the position by generating localized cracks on mold processes mortise, and the mold insert by both ends with tenon is arranged in mortise, have the function that repair localized cracks, extend die life.
Description
Technical field
The present invention relates to die casting mold fields, in particular to extruding die for aluminum shaped material.
Background technique
With increase of the society constantly to big section aluminum profile demand, the quantity of the mold of big section profile is squeezed also therewith
Increase.Often there is the case where localized cracks in use in mold of the diameter more than or equal to 580mm, and tracing it to its cause has:
1. being that the geometry in aluminium section determines, crackle is also easy to produce at the concentration stress such as the angle position in profile section, cantilever root.②
It is that the internal structural flaw of die steel and the structural stress of heat treatment are eliminated endless, is also easy to produce crackle in stress raiser.③
It is after having squeezed, mold is not fully cooled to begin to stew mould less than 200 DEG C, and such chilling causes the temperature difference big and generates larger
Internal stress, formed localized cracks.
Processing for localized cracks, it is common practice to freeze after grinding off the steel of a part of crackle attachment, or directly
Mold is scrapped.Part freezes and can only delay mold failure time the short time, because mold continues after crackle stress when squeezing
Diffusion, mold can only at most squeeze 1~3 ton of aluminium, finally scrap.Mold is caused due to localized cracks for the mold of big specification
Scrap ahead of time, it is few then lose it is up to ten thousand, it is more, lose tens of thousands of members.
Summary of the invention
Present invention seek to address that problem as described above.It is an object of the present invention to provide in a kind of solution problem above
Any one localized cracks repair apparatus and method for repairing and mending.Specifically, the present invention provides a kind of mold localized cracks
Repair apparatus, feeds in mold 1 and p mortise 8 is arranged on face 11 and/or discharge feed side 12, and p mold insert 2 is placed in the p mortise 8
It is interior, wherein p >=1.
The first fourth of the twelve Earthly Branches slot 801 is arranged for the both ends of mortise 8 along its length and the second fourth of the twelve Earthly Branches slot 802,2 both ends of mold insert are provided with first
Tenon 201 and the second tenon 202；In the mounted state, the first tenon 201 and the first fourth of the twelve Earthly Branches slot 801 interference fit, the second tenon
202 and second fourth of the twelve Earthly Branches slot 802 be interference fitted.
First fourth of the twelve Earthly Branches slot 801 and the second fourth of the twelve Earthly Branches slot 802 are symmetrical；First tenon 201 and the second tenon 202 are symmetrical.
Mortise 8 is positioned close at localized cracks 3, and the center line of length direction is vertical with the extending direction of localized cracks 3,
The middle line of mortise 8 in the width direction is close to localized cracks 3.
The mortise 81 before setting m on charging face 11, before mold insert 21 is placed in m before m is a in mortise 81, m >=0；
Mortise 82 after being arranged n in the discharge feed side 12 of mold, after n rear mold inserts 22 are placed in n in mortise 82, n >=0；
P=m+n.
M=n, m >=1；As m=n=1,1.2-1.5 times having a size of preceding 81 size of mortise of rear mortise 82；The n as m > 1
Mortise 81 is equal sized before mortise 82 and m after a and is symmetricly set on charging face 11 and discharge feed side 12；Before m in mortise, the
1.2-1.3 times having a size of mortise 811 before first of mortise 812 before two, and so on, mortise is having a size of mortise before m-1 before m
1.2-1.3 times.
8 depth of mortise is 1/4 to the 1 of 1 thickness of mold.
Mold insert 2 and mold 1 weld.
The present invention also provides a kind of method for repairing and mending of mold localized cracks, methods are as follows:
The position roughing mortise of localized cracks in die face；Mortise is vertical with the extending direction of localized cracks；
Mortise essence is beaten using electric spark, and records electrical fire anthosin and beats electrode data；
Beat electrode data according to essence, as reference dimension, and every side add 0.01mm~0.02mm after cut out insert；
After insert chamfering, insert is packed into mortise；
Insert surrounding is welded.
The reason of present invention is spread according to crackle is applied centainly pre- in crackle two sides and is answered using " patch " of block insert type
Pulling force holds metal base, the power that crackle is further spread after blocking die face stress.To play to mold localized cracks
Repairing effect, extends die life.
Being described below for exemplary embodiment is read with reference to the drawings, other property features of the invention and advantage will
It is apparent from.
Detailed description of the invention
It is incorporated into specification and the attached drawing for constituting part of specification shows the embodiment of the present invention, and with
Principle for explaining the present invention together is described.In the drawings, similar appended drawing reference is for indicating similar element.Under
Attached drawing in the description of face is some embodiments of the present invention, rather than whole embodiments.Those of ordinary skill in the art are come
It says, without creative efforts, other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 according to the present invention in given one embodiment the repair apparatus of mold localized cracks schematic diagram；
Fig. 2 is the signal according to the repair apparatus of the mold localized cracks in another embodiment given by the present invention
Figure；
Fig. 3 illustratively shows the diagrammatic cross-section of the repair apparatus of mold localized cracks (before wherein mold insert is is packed into
State)；
Fig. 4 illustratively shows the mortise schematic diagram of the repair apparatus of mold localized cracks；
The fourth of the twelve Earthly Branches mold insert that Fig. 5 illustratively shows the repair apparatus of mold localized cracks enters schematic diagram after the dress of hole；
The fourth of the twelve Earthly Branches mold insert that Fig. 6 illustratively shows the repair apparatus of mold localized cracks enters the welding schematic diagram after the dress of hole
Attached drawing mark: 1, mold；11, face is fed；12, discharge feed side；2, mold insert；201, the first tenon；202, the second tenon；
21, preceding mold insert；22, rear mold insert；3, crackle；8, mortise；801, the first fourth of the twelve Earthly Branches slot；802, the second fourth of the twelve Earthly Branches slot；811, mortise before first；
812, mortise before second.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the features in the embodiments and the embodiments of the present application can mutual any combination.
The present invention spreads reason according to crackle, is provided with the mold insert of tenon in cracks, increases in crackle two sides and answers in advance
Pulling force holds crackle two sides metal base, while preventing crackle further expansion, blocks the dynamic of localized cracks further expansion
Power.
With reference to the accompanying drawing, the repair apparatus of mold localized cracks provided by the present invention is described in detail.
P mortise 8 is set as shown in Figure 1-3, feeding in mold 1, p mold insert 2 is placed in p on face 11 and/or discharge feed side 12
In a mortise 8, p >=1.
As illustrated in figures 4-5, both ends the first fourth of the twelve Earthly Branches slot 801 of setting and the second fourth of the twelve Earthly Branches slot 802 of mortise 8 along its length, 2 liang of mold insert
End is provided with the first tenon 201 and the second tenon 202；In the mounted state, the first tenon 201 and 801 interference of the first fourth of the twelve Earthly Branches slot are matched
It closes, the second tenon 202 and the second fourth of the twelve Earthly Branches slot 802 interference fit.By using the joinery and its construction in similar carpenter, to fourth of the twelve Earthly Branches slot both ends
Substrate applies answers pulling force in advance.
First fourth of the twelve Earthly Branches slot 801 and the second fourth of the twelve Earthly Branches slot 802 are symmetrical；First tenon 201 and the second tenon 202 are symmetrical.By symmetrical
Design increases service life so that mold insert both ends apply pulling force on base material and balance as far as possible.
Mortise 8 is positioned close at localized cracks 3, and the opening apart from localized cracks is closer, and mold insert can preferably be offset
Because mold is under pressure, the tension to two side direction of localized cracks generated at localized cracks, meanwhile, in actual use,
The position of mortise may include the top of localized cracks, so that the stress for concentrating on localized cracks top originally is dispersed, disappear
De-stress is concentrated；The center line of 8 length direction of mortise is vertical with the extending direction of the localized cracks 3, and mortise 8 is in the width direction
Middle line close to the localized cracks 3.Mortise is closely located to localized cracks, and symmetrically sets along the direction of localized cracks as far as possible
It sets, so that mold insert is further reduced the concentration of stress to the close balance of the pulling force of localized cracks two sides substrate.
As shown in figure 3, mortise 81 before being arranged m on die feeding face 11, m preceding mold inserts 21 are placed in the m preceding fourths of the twelve Earthly Branches
In hole 81, m >=0；Mortise 82 after being arranged n in the discharge feed side 12 of mold, after n rear mold inserts 22 are placed in n in mortise 82, n
≥0；P=m+n.Mortise can be set in charging face, also can be set in discharge feed side, and charging face can also be arranged in simultaneously and go out
On charge level, the application is not specifically limited.
M=n, m >=1；As m=n=1, i.e., one mold insert is respectively set in charging face and discharge feed side, is suitable for localized cracks
The shorter mold of size, in this way setting can block the further expansion of localized cracks.A reality of m=1 is shown in Fig. 1
Apply example, wherein 1.2-1.5 times having a size of preceding 81 size of mortise of rear mortise 82；Illustrate direction, rear mortise 82 mold in addition
Side is shown in broken lines in figure, and the size of empty knife after existing because of discharge feed side, the later mold insert of institute is larger, can be provided relatively more
It is big pre- to answer pulling force.
As m > 1, such as m=n=2, i.e., 2 mold inserts are respectively set on charging face and discharge feed side.Fig. 2 shows when m=2
One embodiment, wherein after 2 the preceding mortise 81 of mortise 82 and 2 it is equal sized and be symmetricly set on charging face 11 and discharging
Face 12；Wherein in 2 preceding mortises, 1.2-1.3 times having a size of mortise 811 before first of mortise 812 before second, before first mortise away from
Localized cracks are open, and position is closer, and mortise is open position farther out according to localized cracks before second, and the purpose being arranged in this way is in part
Crack growth side sets up continuous mold insert, forms step and blocks localized cracks and eliminate the effect of mold meridional stress.It is special
It does not mentionlet alone bright, 2 preceding mortises is shown in FIG. 2, but the present embodiment is not limited to 2, it will also be appreciated that when multiple preceding fourths of the twelve Earthly Branches are arranged
Kong Shi, can with and so on, 1.2-1.3 times having a size of mortise before m-1 of mortise before m.In Fig. 2, because preceding mortise is with after
Mortise position is overlapped, and rear mortise is not shown in the figure, it will be understood that the setting method of mortise and the setting of each preceding mortise of m after n
Method is identical.
As shown in fig. 6, mold insert 2 and mold 1 weld.Mold insert 2 and mold 1 are interference fitted, and because of the influence of machining accuracy, are being inlayed
There may be gaps between part 2 and mold 1, then answering pulling force that scheduled number may be not achieved in the pre- of localized cracks two sides application
Value, therefore welded at mold insert chamfering after mold insert 2 and mold 1 are assembled, while mold insert 2 can be prevented in alternate stress
Effect is lower to be loosened.
8 depth of mortise is 1/4 to the 1/1 of 1 thickness of mold.In the embodiment above, due in die feeding face and discharging
Mortise and mold insert are provided on face simultaneously, so the depth of mortise is the 1/4 of mold thickness in the above-described embodiments, facilitates processing
And assembly, while can play the role of preventing localized cracks further expansion well.
A method of using any of the above-described mold localized cracks repair apparatus are as follows:
The position roughing mortise of localized cracks in die face；Mortise is vertical with the extending direction of localized cracks；
The size dimension of mortise and position are determined according to die size and local flaw size and specific location.
Mortise essence is beaten using electric spark, and records electrical fire anthosin and beats electrode data；
Beat electrode data according to essence, as reference dimension, and every side add 0.01mm~0.02mm after cut out insert；
After insert chamfering, insert is packed into mortise；
Insert surrounding is welded.
According to the above method, first roughing mortise, then mortise is finished, the size then finished according to mortise,
And on this size basis, in addition preset Interference size, is cut into the size of mold insert, ensure that machining accuracy.
Pass through above description, it can be seen that the present invention by mold localized cracks be arranged interference fit mold insert, then
Apply on the substrate of crackle two sides and answer pulling force in advance, prevents mold in pressurized process, crackle continues to expand.Meanwhile by part
Crack growth side sets up mortise, can improve the stress concentration phenomenon in the generation of the top of original localized cracks, blocks
Localized cracks continue the channel of diffusion.Traditional mode for substrate being ground off at localized cracks and then freeze, only splits mold
The substrate of line two sides is attached by weld seam, there is no crackle Producing reason is changed, cannot eliminate stress concentration, can not
Prevent the further diffusion of crackle；And the amount of freezing is big, and the thermal deformation of mold part is big, so that mold is locally answered after squeezing stress
Power increases, and further results in the expansion of localized cracks.
Device and method in the present invention effectively can be repaired and be reinforced to the mold for generating localized cracks, and in reality
Remarkable result is obtained in the application of border, substantially prolongs the service life of mold.For example, passing through after localized cracks occurs in mold
The mold of conventional method repairing, can only squeeze 1~3 ton of aluminium again, and the mold of the method repairing through the invention, squeeze
After pressing the aluminium more than 10 tons, still in continuing to use.Therefore, the device and method in the present invention can greatly prolong mold
Service life reduces loss.
Descriptions above can combine implementation individually or in various ways, and these variants all exist
Within protection scope of the present invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including one ... ", it is not excluded that wrapping
Include in the process, method, article or equipment of the element that there is also other identical elements.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of mold localized cracks repair apparatus, which is characterized in that in mold (1) charging face (11) and/or discharge feed side (12)
Upper p mortise of setting (8), p mold insert (2) are placed in the p mortise (8), wherein p >=1.
2. mold localized cracks repair apparatus as described in claim 1, which is characterized in that the mortise (8) is along its length
Both ends the first fourth of the twelve Earthly Branches slot (801) and the second fourth of the twelve Earthly Branches slot (802) be set, mold insert (2) both ends are provided with the first tenon (201) and the
Two tenons (202)；In the mounted state, first tenon (201) and first fourth of the twelve Earthly Branches slot (801) interference fit, described the
Two tenons (202) and second fourth of the twelve Earthly Branches slot (802) interference fit.
3. mold localized cracks repair apparatus as claimed in claim 2, which is characterized in that first fourth of the twelve Earthly Branches slot (801) and institute
It is symmetrical to state the second fourth of the twelve Earthly Branches slot (802)；First tenon (201) and second tenon (202) are symmetrical.
4. mold localized cracks repair apparatus as claimed in claim 3, which is characterized in that the mortise (8) is positioned close to
At localized cracks (3), the center line of length direction is vertical with the extending direction of the localized cracks (3), and the mortise (8) is along width
The middle line in direction is spent close to the localized cracks (3).
5. the repair apparatus of mold localized cracks as described in claim 1, which is characterized in that
M preceding mortises (81) are set on the charging face (11), mold inserts (21) are placed in described m preceding mortise (81) before m,
m≥0；
N rear mortises (82) are set in the discharge feed side (12) of mold, and mold inserts (22) are placed in described n rear mortise (82) after n
It is interior, n >=0；
P=m+n.
6. mold localized cracks repair apparatus as claimed in claim 5, which is characterized in that m=n, m >=1；As m=1, institute
State 1.2-1.5 times of rear mortise (82) having a size of preceding mortise (81) size；As m > 1, mortise (82) and institute after the n
Mortise (81) is equal sized before stating m and is symmetricly set on the charging face (11) and the discharge feed side (12)；The m preceding fourths of the twelve Earthly Branches
Kong Zhong, 1.2-1.3 times having a size of mortise (811) before first of mortise (812) before second, and so on, before m mortise having a size of
1.2-1.3 times of mortise before m-1.
7. the repair apparatus of mold localized cracks as claimed in claim 5, which is characterized in that mortise (8) depth is mould
Has 1/4 to the 1 of (1) thickness.
8. the repair apparatus of mold localized cracks as claimed in claim 5, which is characterized in that the mold insert (2) and the mould
Has (1) welding.
9. a kind of use mold localized cracks repair apparatus, method as described in claim 1~8 is any are as follows:
1) in die face localized cracks position roughing mortise；The extending direction of the mortise and localized cracks hangs down
Directly；
2) the mortise essence is beaten using electric spark, and records electrical fire anthosin and beats electrode data；
3) electrode data is beaten according to essence, as reference dimension, and every side add 0.01mm~0.02mm after cut out insert；
4) after the insert chamfering, the insert is packed into the mortise；
5) the insert surrounding is welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910320536.4A CN110091122A (en) | 2019-04-20 | 2019-04-20 | A kind of repair apparatus and method for repairing and mending of mold localized cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910320536.4A CN110091122A (en) | 2019-04-20 | 2019-04-20 | A kind of repair apparatus and method for repairing and mending of mold localized cracks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110091122A true CN110091122A (en) | 2019-08-06 |
Family
ID=67445396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910320536.4A Pending CN110091122A (en) | 2019-04-20 | 2019-04-20 | A kind of repair apparatus and method for repairing and mending of mold localized cracks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110091122A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894260A (en) * | 2021-01-22 | 2021-06-04 | 西部超导材料科技股份有限公司 | Hydraulic valve block crack repairing method |
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|---|---|---|---|---|
| US4247973A (en) * | 1979-06-25 | 1981-02-03 | Seal Lock International, Inc. | Method and apparatus for repairing cracked metal parts |
| CN1720118A (en) * | 2002-12-02 | 2006-01-11 | 西门子公司 | Method for production of a component |
| US20060049236A1 (en) * | 2004-08-26 | 2006-03-09 | Michael Minor | Turbine component crack repair using cathodic arc and/or low pressure plasma spraying and hip |
| CN1951623A (en) * | 2006-11-15 | 2007-04-25 | 李昌勋 | Parts for repairing crack of metal surface and method therefore |
| CN106111717A (en) * | 2016-06-24 | 2016-11-16 | 广东坚美铝型材厂（集团）有限公司 | A kind of aluminium alloy extrusion mould splits the restorative procedure of bridge and the mould of reparation thereof |
| CN108843889A (en) * | 2018-06-29 | 2018-11-20 | 浙江海洋大学 | Ocean gas transmission metallic conduit restorative procedure |
| CN108838616A (en) * | 2018-05-31 | 2018-11-20 | 岭东核电有限公司 | Pressurized-water reactor nuclear power plant Emergency diesel structure crack repairs structure and restorative procedure |
| CN210254943U (en) * | 2019-04-20 | 2020-04-07 | 广东坚美铝型材厂（集团）有限公司 | Repairing device for local cracks of die |
-
2019
- 2019-04-20 CN CN201910320536.4A patent/CN110091122A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247973A (en) * | 1979-06-25 | 1981-02-03 | Seal Lock International, Inc. | Method and apparatus for repairing cracked metal parts |
| CN1720118A (en) * | 2002-12-02 | 2006-01-11 | 西门子公司 | Method for production of a component |
| US20060049236A1 (en) * | 2004-08-26 | 2006-03-09 | Michael Minor | Turbine component crack repair using cathodic arc and/or low pressure plasma spraying and hip |
| CN1951623A (en) * | 2006-11-15 | 2007-04-25 | 李昌勋 | Parts for repairing crack of metal surface and method therefore |
| CN106111717A (en) * | 2016-06-24 | 2016-11-16 | 广东坚美铝型材厂（集团）有限公司 | A kind of aluminium alloy extrusion mould splits the restorative procedure of bridge and the mould of reparation thereof |
| CN108838616A (en) * | 2018-05-31 | 2018-11-20 | 岭东核电有限公司 | Pressurized-water reactor nuclear power plant Emergency diesel structure crack repairs structure and restorative procedure |
| CN108843889A (en) * | 2018-06-29 | 2018-11-20 | 浙江海洋大学 | Ocean gas transmission metallic conduit restorative procedure |
| CN210254943U (en) * | 2019-04-20 | 2020-04-07 | 广东坚美铝型材厂（集团）有限公司 | Repairing device for local cracks of die |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894260A (en) * | 2021-01-22 | 2021-06-04 | 西部超导材料科技股份有限公司 | Hydraulic valve block crack repairing method |
| CN112894260B (en) * | 2021-01-22 | 2022-09-09 | 西部超导材料科技股份有限公司 | Hydraulic valve block crack repairing method |
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