CN110238309A - Automobile forming class mold prevents extra quality device - Google Patents
Automobile forming class mold prevents extra quality device Download PDFInfo
- Publication number
- CN110238309A CN110238309A CN201910549150.0A CN201910549150A CN110238309A CN 110238309 A CN110238309 A CN 110238309A CN 201910549150 A CN201910549150 A CN 201910549150A CN 110238309 A CN110238309 A CN 110238309A
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- architecture part
- benchmark architecture
- mold
- groove
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Classifications
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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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
-
- 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
- B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention relates to a kind of automobile forming class molds to prevent extra quality device, belongs to car panel die technical field.The present invention is mainly suitable for high-strength plate or slab mold structures, prevent extra quality device by adding between the wedge slide block and mold insert of mold, and to key parameter (fracture width b, f1And f2The evaded distance d of determining breaking point relative position, two sides1And d2) rationally design, so that mould strength is safe and reliable when normal condition shapes single plate；When two plates occurs in mold cavity, this prevents that extra quality device is broken in die main body structural failure starting section A-A (section between groove floor and benchmark architecture part front).The contact stress in the formings such as mold insert, die holder face is buffered using the avoiding space in the device in fracture process, so that mould structure is not damaged, can guarantee the safety and service life of whole secondary mold.
Description
Technical field
The present invention relates to a kind of automobile forming class molds to prevent extra quality device, belongs to car panel die technical field.
Background technique
The design structure original intention of any mold is one plate of forming, and mainly mould structure does not have space in the design
Two plates are shaped simultaneously.When because surprisingly shaping two plates, it is divided to two kinds of situations here according to plate thickness and tensile strength:
One is when thin plate is opened in forming two, such as forming outside plate class single thickness is in the plate of 0.6mm, due to more one
A material is thick, and the power for causing press tonnage all acts on second plate, causes mold force part that the bullet of 0.6mm occurs
Property deflection, the thickness of second plate could be avoided, rule of thumb, after the flexible deformation of 0.6mm occurs for usual mould structure,
Press pressure revocation mold can also restore normally, and structure is not damaged.
Another kind is forming high-strength plate or slab class mould structure, such as when middle high-strength plate of the forming thickness in 1.2mm,
Since middle high-strength plate yield strength is high, when all press tonnages are applied to the mould structure under second plate, according to reality
Border operating condition mould structure almost can not generate 1.2mm or more flexible deformation after still resilient, Many times can be in moulds
Have stress concentration portion position and moulding fracture occurs.
On grabbing extra quality probability and damage degree, the products such as high-strength plate such as A column, B column in automobile die, due to ruler
Very little is in that beam shape grabs extra quality phenomenon and be particularly acute, prevent extra quality sensor at present when grabbing blank using automatic feeding device
Although above-mentioned phenomenon can be avoided to a certain extent, in certain structures or production line, using effect is bad sometimes, Wu Fabao
The extra quality discrimination of card 100%.According to previous quality accident, when occurring extra quality, since the gap of die face is smaller,
When increasing a plate thickness, the stress of inlaid piece of mould or die holder be increased dramatically in forming, cause the fracture of die holder or mold insert, on the one hand
It will cause mold economic loss, while will lead to the halt production of automatic stamping production line one month or more.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of automobile forming class mold prevents extra quality device, it is suitable for height
Strong plate or slab mold structure can guarantee the safety of whole secondary mold when two plates occurs in mold cavity.
To solve above-mentioned technical problem the technical scheme adopted by the invention is that: automobile forming class mold prevent extra quality device,
Including benchmark architecture part, the top and bottom of benchmark architecture part are plane and are parallel to each other, the high scale of benchmark architecture part
It is denoted as h；The front and back of benchmark architecture part is plane and is parallel to each other；The back side medium position of benchmark architecture part is set
It is equipped with groove, the bottom surface of groove is the plane for being parallel to the benchmark architecture part back side, and the sounding mark of groove is d1, groove is through base
The bottom width of the upper and lower ends of quasi- structural member, groove is labeled as a, along the bottom width phase of the length direction of groove, groove
Together；The front medium position of benchmark architecture part is provided with rectangular convex block, and the top surface of convex block is to be parallel to benchmark architecture part just
The plane in face, the number of altitude of convex block are d2, the both ends of the surface of convex block length direction are overlapped with the upper and lower end faces of benchmark architecture part；
The thickness of plate to be formed is set as t, d1≥2t,d2≥2t。
In the same transversal cross-section of benchmark architecture part, two-end-point of the groove floor in recess width direction is respectively labeled as
U and p, two-end-point of the convex block bottom end in bump width direction are respectively labeled as v and q；Point u and point v are located at the same side, point p and point q
Positioned at the same side；Point v groove floor subpoint compared to point u closer to groove floor center, throwing of the point v in groove floor
The spacing of shadow point and point u are set as f1, 5mm≤f1≤10mm；Point q groove floor subpoint compared to point p closer to groove
Bottom center, point q are set as f in the subpoint of groove floor and the spacing of point p2；5mm≤f2≤10mm。
The back side of benchmark architecture part is set as wedge slide block contact surface, and the top surface of convex block is set as mold insert contact surface；Groove
Bottom surface and the positive spacing of benchmark architecture part be rupture cross section width, be labeled as b；Rupture cross section width b meets following condition:
Wherein, σIt answersFor the contact stress size of mold mold insert contact surface during normal production；[σPerhaps]
For the stretching allowable stress size of benchmark structure material；A is the bottom width of groove；k1And k2It is constant, k1Value is
1.1~1.3, k2Value is 0.7~0.9.
Further, σIt answersIt is determined according to following steps: using formula F=1.15 × σ × t × (L+ ∑ l firsti×cos
Forming force F θ) is calculated, wherein σ is the tensile strength of plate to be formed, t is the thickness of plate to be formed, the wheel that L is shaped region
Wide perimeter, liIt is the section tilt angle that pressing direction and crest line are formed for the length of crest line feature, θ in shaped region；Then
Using finite element software, σ is calculated by applying forming force FIt answers。
Further, d1=d2。
Further, f1=f2。
Further, k1Value is 1.2, k2Value is 0.8.
Further, the top surface of benchmark architecture part is fixedly connected with connecting plate, the other end of connecting plate is relative to benchmark
The reverse side of structural member towards benchmark architecture part, which overhangs, to be arranged, and overhanging position is provided with bolt connecting hole.
Further, connecting plate is set to the position that the outer end face of groove intersects with the top surface of benchmark architecture part；Connection
Plate is two pieces, and is symmetrical set using the center line in recess width direction as axis.
Further, further including wedge slide block and mold insert, benchmark architecture part is fixedly mounted in wedge slide block, and tiltedly
Slider wedge contact surface is in contact with wedge slide block, and mold insert contact surface is in contact with mold insert.
Further, benchmark architecture part be arranged side by side it is multiple.
The beneficial effects of the present invention are: extra quality device is prevented by adding between the wedge slide block and mold insert of mold, and
To key parameter (fracture width b, f1And f2The evaded distance d of determining breaking point relative position, two sides1And d2) made rationally
Design, so that mould strength is safe and reliable when normal condition shapes single plate；When two plates occurs in mold cavity
When, this prevents extra quality device in die main body structural failure starting section A-A (cutting between groove floor and benchmark architecture part front
Face) it is broken.The contact in the formings such as mold insert, die holder face is buffered using the avoiding space in the device in fracture process
Stress can guarantee the safety and service life of whole secondary mold so that mould structure is not damaged.
Detailed description of the invention
Fig. 1 is the X-Y scheme that extra quality device is prevented in the present invention；
Fig. 2 is the stress analysis schematic diagram that extra quality device is prevented in the present invention；
Fig. 3 is the sheet forming regional structure schematic diagram in the embodiment of the present invention；
Fig. 4 a is the structural schematic diagram that the installation embodiment one of extra quality device is prevented in the present invention；
Fig. 4 b is the structural schematic diagram that the installation embodiment two of extra quality device is prevented in the present invention；
Fig. 5 is the three-dimensional figure for preventing extra quality device；
Marked in the figure: 1- benchmark architecture part, 2- wedge slide block contact surface, 3- mold insert contact surface, 4- connecting plate, 5- bolt connect
Connect hole, 6- wedge slide block, 7- mold insert, 8- bolt, 9- lower punch.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
As shown in Figure 1, Figure 2 and shown in Fig. 5, the present invention includes benchmark architecture part 1, and the top and bottom of benchmark architecture part 1 are
It plane and is parallel to each other, the number of altitude of benchmark architecture part 1 is h；The front and back of benchmark architecture part 1 is plane, simultaneously
And it is parallel to each other；The back side medium position setting of benchmark architecture part 1 is fluted, and the bottom surface of groove is to be parallel to benchmark architecture part 1
The plane at the back side, the sounding mark of groove are d1, upper and lower ends of the groove through benchmark architecture part 1, the bottom width mark of groove
It is denoted as a, the bottom width along the length direction of groove, groove is identical；The front medium position of benchmark architecture part 1 is provided with length
Rectangular convex block, the top surface of convex block are to be parallel to the positive plane of benchmark architecture part 1, and the number of altitude of convex block is d2, convex block is long
The both ends of the surface in degree direction are overlapped with the upper and lower end faces of benchmark architecture part 1；The thickness of plate to be formed is set as t, d1≥2t,d2
≥2t。
In the same transversal cross-section of benchmark architecture part 1, two-end-point of the groove floor in recess width direction marks respectively
For u and p, two-end-point of the convex block bottom end in bump width direction is respectively labeled as v and q；Point u and point v be located at the same side, point p and
Point q is located at the same side；Point v groove floor subpoint compared to point u closer to groove floor center, point v is in groove floor
Subpoint and the spacing of point u be set as f1, 5mm≤f1≤10mm；Point q groove floor subpoint compared to point p closer to
Groove floor center, point q are set as f in the subpoint of groove floor and the spacing of point p2；5mm≤f2≤10mm。
The back side of benchmark architecture part 1 is set as wedge slide block contact surface 2, and the top surface of convex block is set as mold insert contact surface 3；It is recessed
The bottom surface of slot and the positive spacing of benchmark architecture part 1 are rupture cross section width, are labeled as b；Rupture cross section width b meets following item
Part:Wherein, σIt answersFor the contact stress size of mold mold insert contact surface 3 during normal production；[σPerhaps] it is base
The stretching allowable stress size of quasi- 1 material of structural member；A is the bottom width of groove；k1And k2It is constant, k1Value be 1.1~
1.3, k2Value is 0.7~0.9.To those skilled in the art, σIt answersIt can be obtained, can also be adopted according to theoretical formula method
It is obtained with the method for finite element analysis.In view of theoretical calculation precision is not high, therefore present invention preferably employs FEM calculation, this
Sample can more meet actual operating condition, and FEM calculation is more mature technology, such as is had using ANSYS, ABAQUS structure
Limiting meta software can be achieved.
σ in the present inventionIt answersIt is determined according to following steps: using formula F=1.15 × σ × t × (L+ ∑ l firsti×cos
Forming force F θ) is calculated, wherein σ is the tensile strength of plate to be formed, t is the thickness of plate to be formed, the wheel that L is shaped region
Wide perimeter, liIt is the section tilt angle that pressing direction and crest line are formed for the length of crest line feature, θ in shaped region；Then
Using finite element software, σ is calculated by applying forming force FIt answers.Such as embodiment shown in Fig. 3, form of calculation are as follows:
F=1.15 × σ × t × (l1+l2+l3+l4+l5×cosθ).Due to product area be mostly certain angle side it is whole
Shape, theoretical calculation prevent the contact stress σ that extra quality device is subject toIt answersMore difficult, the present embodiment is limited using abaqus large-scale general
Meta software obtains the contact stress size σ of mold insert backrest by applying forming force FIt answers。
[σPerhaps] be 1 material of benchmark structural member stretching allowable stress size, it can be obtained according to query material mechanics handbook
Numerical value.
A is the bottom width of groove, is chosen according to the contact area and area of lateral force, and principle mainly works as side
When acting on this to power and preventing in extra quality mechanism, total can guarantee the uniform stabilization of stress, therefore the design of parameter a is only
Want compound actual conditions just, after parameter a is determined, the most important parameter of the present invention is exactly the design of fracture width b.
The Parameter Conditions derivation process that cross-sectional width b is broken in the present invention is as follows:
Step 1, the contact stress size σ of mold mold insert contact surface 3 during normal productionIt answersAs primary condition, first basis
The internal force F for preventing extra quality device Strength Failure section A-A of stress is calculated in flexibility methodn=σIt answersS1；Wherein, S1=
Ah, a are the bottom width of groove, and h is the height of benchmark structural member 1.
Step 2: calculate single plate it is stamping in normal conditions when, this prevents the sectional dimension of extra quality device so that
It obtains when normal condition shapes single plate, mould strength is safe and reliable.
Select corresponding strength theory, it is contemplated that impact loading in punching course chooses k1=1.1 to 1.3 times
Material allowable stress is designed, i.e. σ≤k1[σPerhaps], it obtains
By S2=bh and Fn=σIt answersAh obtains cross-sectional widthHere according to experience k1Can be more preferably
1.2；σIt answersFor the contact stress size of mold mold insert contact surface 3 during normal production；[σPerhaps] permitted for the stretching of 1 material of benchmark structural member
Use stress intensity；A is the bottom width of groove.
Step 3: when occurring double plates in punching press operating condition, forming force be increased dramatically, in order to avoid die face extruding is made
At fracture, it is necessary to make to prevent extra quality device fracture to terminate in advance forming work.Calculate the maximum width of section A-A moment fracture
Size, it is contemplated that the gap of mold punch-die prevents the processing hardening factor of extra quality device materials, chooses k here2=0.7 to 0.9
Material allowable stress again is designed, i.e. σ >=k2[σPerhaps], it obtains
By S2=bh and Fn=σIt answersAh obtains cross-sectional widthHere according to experience k2Can be more preferably
0.8；σIt answersFor the contact stress size of mold mold insert contact surface 3 during normal production；[σPerhaps] permitted for the stretching of 1 material of benchmark structural member
Use stress intensity；A is the bottom width of groove.
Combining step two and step 3 are it is found that rupture cross section width b must satisfy following condition:Wherein, σIt answersFor the contact stress size of mold mold insert contact surface 3 during normal production；[σPerhaps] on the basis of
The stretching allowable stress size of 1 material of structural member；A is the bottom width of groove；k1And k2It is constant, k1Value be 1.1~
1.3, k2Value is 0.7~0.9.
As shown in figures 4 a and 4b, which, when implementing, includes wedge slide block 6 and mold insert 7, benchmark knot in mould structure
Component 1 is fixedly mounted in wedge slide block 6, and wedge slide block contact surface 2 is in contact with wedge slide block 6, mold insert contact surface 3 with
Mold insert 7 is in contact.When grabbing extra quality, when which is broken, the position of fracture is in point p, point q, point u, this 4 points of point v
In the region surrounded.Shape it is extra quality during cause the device that can not be broken in order to avoid the fluctuation of forming force, need p and
Q, u and v breaking point is staggered respectively, and meets 5mm≤f1≤10mm；5mm≤f2≤10mm.Preferred embodiment is f1=f2。
In order to enable buffering and avoiding space are met the requirements, the present invention simultaneously limits the evaded distance in device:
The thickness of plate to be formed is set as t, d1≥2t,d2≥2t；d1For the depth of groove, i.e., the evacuation of 6 this side of wedge slide block away from
From；d2For the height of convex block, the i.e. evaded distance of 7 this side of mold insert.Preferred embodiment is d1=d2。
In order to facilitate the installation of, the top surface of benchmark architecture part 1 is fixedly connected with connecting plate 4, the other end of connecting plate 4 relative to
The reverse side of benchmark architecture part 1 towards benchmark architecture part 1, which overhangs, to be arranged, and overhanging position is provided with bolt connecting hole 5.Even
Fishplate bar 4 is set to the position that the outer end face of groove intersects with the top surface of benchmark architecture part 1；Connecting plate 4 is two pieces, and with groove
The center line of width direction is symmetrical set for axis.When implementing, connecting plate 4 can generally be directly welded at benchmark architecture part 1
Then top will prevent that extra quality device is mounted in wedge slide block 6 by bolt 8.In addition, in same mould structure, base
Quasi- structural member 1 can be multiple for what is be arranged side by side.Fig. 3 is the axonometric drawing of the structure, in the present embodiment, using setting side by side
Two set.
Claims (9)
1. automobile forming class mold prevents extra quality device, it is characterised in that: including benchmark architecture part (1), the top of benchmark architecture part (1)
Face and bottom surface are plane and are parallel to each other, and the number of altitude of benchmark architecture part (1) is h；The front of benchmark architecture part (1)
It is plane with the back side and is parallel to each other；Fluted, the bottom surface of groove is arranged in the back side medium position of benchmark architecture part (1)
For the plane for being parallel to benchmark architecture part (1) back side, the sounding mark of groove is d1, groove is upper through benchmark architecture part (1)
The bottom width at lower both ends, groove is labeled as a, and the bottom width along the length direction of groove, groove is identical；Benchmark architecture part
(1) front medium position is provided with rectangular convex block, and the top surface of convex block is positive flat to be parallel to benchmark architecture part (1)
Face, the number of altitude of convex block are d2, the both ends of the surface of convex block length direction are overlapped with the upper and lower end faces of benchmark architecture part (1)；To
The thickness of forming plate is set as t, d1≥2t,d2≥2t；
In the same transversal cross-section of benchmark architecture part (1), two-end-point of the groove floor in recess width direction is respectively labeled as u
And p, two-end-point of the convex block bottom end in bump width direction are respectively labeled as v and q；Point u and point v are located at the same side, point p and point q
Positioned at the same side；Point v groove floor subpoint compared to point u closer to groove floor center, throwing of the point v in groove floor
The spacing of shadow point and point u are set as f1, 5mm≤f1≤10mm；Point q groove floor subpoint compared to point p closer to groove
Bottom center, point q are set as f in the subpoint of groove floor and the spacing of point p2；5mm≤f2≤10mm；
The back side of benchmark architecture part (1) is set as wedge slide block contact surface (2), and the top surface of convex block is set as mold insert contact surface (3)；
The bottom surface of groove and benchmark architecture part (1) positive spacing are rupture cross section width, are labeled as b；Rupture cross section width b meets such as
Lower condition:Wherein, σIt answersFor the contact stress size of mold mold insert contact surface (3) during normal production；
[σPerhaps] be benchmark structural member (1) material stretching allowable stress size；A is the bottom width of groove；k1And k2It is constant, k1
Value is 1.1~1.3, k2Value is 0.7~0.9.
2. automobile forming class mold as described in claim 1 prevents extra quality device, which is characterized in that σIt answersIt is true according to following steps
It is fixed: to use formula F=1.15 × σ × t × (L+ ∑ l firsti× cos θ) forming force F is calculated, wherein σ is the anti-of plate to be formed
Tensile strength, t are the thickness of plate to be formed, L is shaped region profile perimeter, liFor the length of crest line feature in shaped region
Degree, θ are the section tilt angle that pressing direction and crest line are formed；Then finite element software is used, is calculated by applying forming force F
Obtain σIt answers。
3. automobile forming class mold as described in claim 1 prevents extra quality device, it is characterised in that: d1=d2。
4. automobile forming class mold as described in claim 1 prevents extra quality device, it is characterised in that: f1=f2。
5. automobile forming class mold as described in claim 1 prevents extra quality device, it is characterised in that: k1Value is 1.2, k2Value
It is 0.8.
6. automobile forming class mold as described in claim 1 prevents extra quality device, it is characterised in that: the top of benchmark architecture part (1)
Face is fixedly connected with connecting plate (4), and the other end of connecting plate (4) is relative to benchmark architecture part (1) towards benchmark architecture part (1)
Reverse side, which overhangs, to be arranged, and overhanging position is provided with bolt connecting hole (5).
7. automobile forming class mold as claimed in claim 6 prevents extra quality device, it is characterised in that: connecting plate (4) is set to recessed
The position that the outer end face of slot intersects with the top surface of benchmark architecture part (1)；Connecting plate (4) is two pieces, and with recess width direction
Center line be symmetrical set for axis.
8. automobile forming class mold as claimed in any of claims 1 to 7 in one of claims prevents extra quality device, it is characterised in that: also wrap
Wedge slide block (6) and mold insert (7) are included, benchmark architecture part (1) is fixedly mounted on wedge slide block (6), and wedge slide block contacts
Face (2) is in contact with wedge slide block (6), and mold insert contact surface (3) is in contact with mold insert (7).
9. automobile forming class mold as claimed in claim 8 prevents extra quality device, it is characterised in that: benchmark architecture part (1) is simultaneously
Row is arranged multiple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910549150.0A CN110238309B (en) | 2019-06-24 | 2019-06-24 | Double-material prevention device for automobile forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910549150.0A CN110238309B (en) | 2019-06-24 | 2019-06-24 | Double-material prevention device for automobile forming die |
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| CN110238309A true CN110238309A (en) | 2019-09-17 |
| CN110238309B CN110238309B (en) | 2020-11-10 |
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ID=67889110
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| CN201910549150.0A Active CN110238309B (en) | 2019-06-24 | 2019-06-24 | Double-material prevention device for automobile forming die |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004276077A (en) * | 2003-03-17 | 2004-10-07 | Nsk Ltd | Hydroforming apparatus and hydroforming method |
| CN204320939U (en) * | 2014-11-28 | 2015-05-13 | 天津汽车模具股份有限公司 | A kind of piecemeal drawing insert block key |
| CN204545218U (en) * | 2015-04-24 | 2015-08-12 | 卡斯马汽车***（重庆）有限公司 | Device is grabbed in heat stamping and shaping production line discharging leakproof |
| CN207735419U (en) * | 2017-11-30 | 2018-08-17 | 东莞特米勒电子科技有限公司 | A kind of double material strips diel |
-
2019
- 2019-06-24 CN CN201910549150.0A patent/CN110238309B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004276077A (en) * | 2003-03-17 | 2004-10-07 | Nsk Ltd | Hydroforming apparatus and hydroforming method |
| CN204320939U (en) * | 2014-11-28 | 2015-05-13 | 天津汽车模具股份有限公司 | A kind of piecemeal drawing insert block key |
| CN204545218U (en) * | 2015-04-24 | 2015-08-12 | 卡斯马汽车***（重庆）有限公司 | Device is grabbed in heat stamping and shaping production line discharging leakproof |
| CN207735419U (en) * | 2017-11-30 | 2018-08-17 | 东莞特米勒电子科技有限公司 | A kind of double material strips diel |
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| CN110238309B (en) | 2020-11-10 |
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