CN109878001A - A kind of two chamber of mould molding semi-closed structure answers the RTM mold of material product - Google Patents
A kind of two chamber of mould molding semi-closed structure answers the RTM mold of material product Download PDFInfo
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- CN109878001A CN109878001A CN201910235457.3A CN201910235457A CN109878001A CN 109878001 A CN109878001 A CN 109878001A CN 201910235457 A CN201910235457 A CN 201910235457A CN 109878001 A CN109878001 A CN 109878001A
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- 238000000465 moulding Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 32
- 238000013461 design Methods 0.000 claims abstract description 37
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 12
- 230000002146 bilateral effect Effects 0.000 abstract description 2
- 238000009745 resin transfer moulding Methods 0.000 description 32
- 238000000034 method Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The present invention provides the RTM mold that two chamber of mould molding semi-closed structure answers material product, including upper die and lower die and several core models, annular seal groove is set in the upper mold, closed cavity is formed with the lower die, several core models are set in the die cavity, the die cavity is divided into two chambers, the lower die designs a glue-feeder, it realizes with combined flow channel cooperation on the core model to two chambers injecting resin, the upper mold designs two gum outlets, it is steeped with combined flow channel cooperation dumping row on the core model, is used for two bilateral symmetry formed products；Positioning convex platform is arranged in the upper mold middle position, positioning is realized in groove cooperation with intermediate core mole, four, both sides core model realizes positioning by four " I " fonts positioning keys and the cooperation of the groove of the intermediate core mole, two sides core model splits into two pieces and is designed to wedge structure, cooperates with the upper mold and assembles.The mold is designed according to product semi-closed structure, realizes that core model exempts to be bolted and precise positioning, is effectively reduced demoulding difficulty.
Description
Technical field
The present invention relates to a kind of carbon fibre composite RTM technological forming mold design fields, more particularly to an a kind of mould
Two chambers molding semi-closed structure answers the RTM mold of material product.
Background technique
The abbreviation of RTM, that is, resin transfer moulding (Resin Transfer Moulding) is a kind of multiple material closed moulding work
Skill technology is a kind of by the way that liquid resin to be injected into the Guan Bi mould of the good reinforcing material of prior laying, in pressurization 1bar-
Guarantee that resin Uniform Flow and reinforcing material in die cavity are sufficiently impregnated under the pressure environment of 10bar, final curing molding one
Kind is suitable for multiple material product low cost liquid moulding process.RTM technique has high production efficiency, and manufacture Product Precision is high, apparently
It is high-quality, and the characteristics of can directly be integrally formed complicated shape product, in aerospace, rail traffic and automotive field etc.
To being widely applied.
Designing and manufacturing for RTM mold is key technology in RTM technique, and the superiority and inferiority of mold design determines a product
Shaping efficiency, product qualification rate, quality and cost answer material product especially for a semi-closed structure, need to core model into
The reasonable piecemeal of row, Position Design and draft design etc., and be rationally arranged into gum outlet and disengaging glue runner, otherwise cause precast body
Laying and difficult forming, and be difficult to demould, qualification rate is low etc.；Existing RTM mold is due to product shape or runner design complexity etc.
It is limited, it is typically designed to the molding of single mode single-chamber, is unfavorable for improving formed product efficiency.
The above problem is should to pay attention to and solve the problems, such as in RTM mold design and use process, while having must
A kind of RTM mold of two chamber of a mould is developed, shaping efficiency is improved, further decreases batch production cost.
Summary of the invention
The purpose of the present invention is to provide the RTM molds that a kind of two chamber of mould molding semi-closed structure answers material product, pass through
Reasonable piecemeal and design core model realize that complicated semi-closed structure is answered material product and formed in pairs, answer material to solve semi-closed structure
The problem that product demoulding is difficult and the original single mode single-chamber design scheme runner design of RTM product is complicated, shaping efficiency is low.
To achieve the above object, the present invention provides following design scheme: one kind one mould, two chamber molding semi-closed structure answers material
The RTM mold of product, including upper die and lower die and internal molding core model, the upper mold is interior to be equipped with annular seal groove, so that with described
Lower die forms closed cavity, and the internal molding core model is divided into five pieces, including the outside core models of left and right two, two inside core models and
One intermediate core mole is wedge-shaped design between core model, and cooperation is assembled in the seal groove, and the intermediate core mole passes through multiple
" I " fonts are keyed four core models of two sides, while die cavity is divided into left and right two chambers, and the lower die is equipped with into glue
Mouthful, cooperate the internal molding enterprising glue runner of core model to realize to two chambers injecting resin, set in the upper mold there are two gum outlet,
With plastic emitting runner cooperation dumping row's bubble on the internal molding core model, formed in pairs for product.
A further improvement of the present invention is that: the middle position of the upper mold is equipped with positioning convex platform, in the intermediate core mole
Equipped with groove compatible with the positioning convex platform, core model positioning is realized.
When assembling pellet, boss draft face is first real by the groove of intermediate core mole and upper mold positioning convex platform as mating surface
Now cooperation positioning, positioning convex platform and the non-mating surface of groove are designed using empty avoiding.
A further improvement of the present invention is that: the positioning convex platform is rectangular boss, and length and width 40mm-50mm, height is not less than
10mm, drafting angle are designed as 5 ° -10 °, are designed between the positioning convex platform and the groove surface using 1mm-2mm empty avoiding.
A further improvement of the present invention is that: it is characterized by: the intermediate core mole wedge shape drafting angle is 5 ° -10 °, institute
Stating " I " fonts key height is 10mm-20mm, and drafting angle is 5 ° -10 °.
A further improvement of the present invention is that: the " I " fonts bond number amount be four, upper semisection and it is oriented in
Between core model cooperation positioning, lower semisection is respectively used to four inside core models of connection, carries out assembly cooperation positioning and (be equipped with inside core model and hold
Receive the cavity of the " I " fonts key).
A further improvement of the present invention is that: it is equipped on 5 core models of the internal molding core model for demoulding and hanging
Fill the stripper bolt hole carried.
A further improvement of the present invention is that: be oriented to by guide pillars and bushes between the upper die and lower die and slightly determine
Position, the guide post is arranged on four angles of the upper mold, and described lead is set on the lower die and the guide post is corresponding
Position, the upper mold are diagonally equipped with locator, are accurately positioned by diagonal two locators.
A further improvement of the present invention is that: it is described into glue runner be arranged in left and right two chambers intermediate common edge, i.e., in
Between core model middle part, the middle position of corresponding lower die is arranged in the glue-feeder, and the plastic emitting runner is separately designed other two
Side, the middle position of corresponding upper mold two sides is arranged in the gum outlet, described to be all made of company into glue runner and the plastic emitting runner
Continuous boss design, raised head face and die face cooperate, and increase flow channel cavity region and mould contact surface product, boss bottom surface and mold
0.5mm-4mm clearance fit is reserved in face, forms resin channels.
A further improvement of the present invention is that: bolt mode locking, the upper mold point are used between the upper mold and the lower die
1mm-2mm empty avoiding is used to design outside type face bolt and the region seal groove 10mm-20mm.
The present invention provides two chamber of mould molding semi-closed structure and answers the RTM mold of material product, including upper die and lower die and several
Annular seal groove is arranged in the upper mold in core model, forms closed cavity with the lower die, several core models are set to the die cavity
It is interior, the die cavity is divided into two chambers, the lower die designs a glue-feeder, realizes with combined flow channel cooperation on the core model
To two chambers injecting resin, the upper mold designs two gum outlets, steeps, uses with combined flow channel cooperation dumping row on the core model
In two bilateral symmetry formed products；Positioning convex platform is arranged in the upper mold middle position, cooperates with the groove of intermediate core mole and realizes
Positioning, four, both sides core model realize positioning, two sides by four " I " fonts positioning keys and the cooperation of the cavity of the intermediate core mole
Core model splits into two pieces and is designed to wedge structure, cooperates with the upper mold and assembles.The mold is special according to product semi-closed structure
Point design realizes that semi-closed structure product is easy demoulding and two chamber of a mould by carrying out reasonable piecemeal and wedge-shaped design to core model
Molding is designed by intermediate core mole groove and " I " fonts positioning key etc., realizes that core model exempts to be bolted and precise positioning, effectively
Demoulding difficulty is reduced, enables to semi-closed structure to answer the molding of material product and is easy, size Control is accurate, and molding improves efficiency.
Compared with prior art, the present invention has following significant effect:
(1) present invention is reasonable to internal core model piecemeal, solves the problems, such as two semi-closed structure product strippings, while realizing a mould two
Chamber molding, improves formed product efficiency, reduces cost of goods manufactured.
(2) upper mold is designed using boss in the present invention program, first positions intermediate core mole, and creative design " I " fonts
Key positioning is formed core model for connecting and fixing, while rationally being designed using empty avoiding inside four additional, it is fixed to can satisfy core model
Position requires, and cancels using the common fixations such as bolt pin and connection core model mode, and core model assembling assembly and product is effectively reduced
Difficulty is demoulded, mold assembling and product manufacturing period are shortened, molding risk is reduced, improves shaping efficiency.
(3) die cavity two sides core model is respectively split into two pieces when present invention design, and designs wedgewise, be convenient for product precast body
Inside core model is first placed when preparation, then places outside core model, when upper and lower mould molds, gap is molded by control die joint, to wedge
Core model applies mold clamping force on the outside of shape, then by the internal side core mould pressure lateral force of outside core model, it can be achieved that precast body side is compacted, together
When avoid damage to fiber preform, for needing pellet when applying laterally-clamped power by pellet to cut in similar RTM mold
Scheme has important reference.
(4) present invention passes through into glue runner design, in the intermediate common edge of symmetrical two product, plastic emitting runner separately designed
On other both sides, all using one group of appropriately sized and height one group of boss, it is used as runner, wherein boss face and mold cooperate,
Play the role of supporting die cavity, preset clearance can provide resin channels between boss, and creativeness solves one mould of multiple material RTM technique, two chamber
Runner design problem all has very important reference for other similar product RTM process mould.
(5) the upper mold die joint that the present invention designs is designed using empty avoiding, when solution die joint is curved surface, die joint difficult processing
The problems such as degree is big, and precision is difficult to control, while can use for reference in similar RTM mold, no matter plane or curved surface die joint, it is logical
Empty avoiding design is crossed, the land areas high to requirement on machining accuracy is greatly reduced, for improving mold processing efficiency, mold is matched
Mould and raising machining accuracy have important reference.
Detailed description of the invention
Fig. 1 is that the axis for the RTM mold that one mould of one kind, two chamber molding semi-closed structure of the invention answers material product surveys view signal
Figure.
Fig. 2 is that the upper mold shaft for the RTM mold that one mould of one kind, two chamber molding semi-closed structure of the invention answers material product surveys view
Schematic diagram.
Fig. 3 is showing into glue runner for the RTM mold that one mould of one kind, two chamber molding semi-closed structure of the invention answers material product
It is intended to.
Fig. 4 is that one mould of one kind, two chamber molding semi-closed structure of the invention answers molding core model inside the RTM mold of material product
Combination and plastic emitting runner schematic top plan view
Fig. 5 is the RTM mold intermediate core mole vertical view signal that one mould of one kind, two chamber molding semi-closed structure of the invention answers material product
Figure.
One mould of one kind, two chamber molding semi-closed structure Fig. 6 of the invention answers the first schematic cross-sectional view of RTM mold of material product
Fig. 7 is the second schematic cross-sectional view of RTM mold that one mould of one kind, two chamber molding semi-closed structure of the invention answers material product
Description of symbols:
1- upper mold, 2- lower die, 3- intermediate core mole, 4- seal groove, 5- glue-feeder, 6- is into glue runner, core model on the outside of 7-, side core in 8-
Mould, 9- locator, 10- guide post, 11- core model stripper bolt hole, 12- upper mold die joint empty avoiding region, 13- positioning convex platform, 14- go out
Jiao Kou, 15- " I " fonts key, 16- plastic emitting runner, 17- positioning groove, 18- die bolt.
Specific embodiment
The preferred embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or like element or element with the same or similar functions are indicated to same or similar label eventually.Below with reference to
The embodiment of attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
As shown in Figure 1, the present embodiment provides the RTM mold that a kind of two chamber of mould molding semi-closed structure answers material product, packet
Upper mold (1), lower die (2) and internal molding core model are included, annular seal groove (4) are equipped in the upper mold (1), so that with the lower die
(2) closed cavity is formed, the internal molding core model is divided into five pieces, including the outside core model (7) of left and right two, two inside core models
It (8) and an intermediate core mole (3), is wedge-shaped design between core model, cooperation is assembled in the seal groove (4), the intermediate core
Mould (3) connects four core models of two sides by multiple " I " fonts keys (15), while die cavity is divided into left and right two chambers, institute
Lower die (2) are stated equipped with glue-feeder (5), cooperate the internal molding enterprising glue runner (6) of core model, as shown in figure 3, realizing to two chambers
Room injecting resin, (1) sets that there are two plastic emitting runners (16) on gum outlet (14) and the internal molding core model to match in the upper mold
Dumping row's bubble is closed, is formed in pairs for product.
As shown in Fig. 2, Fig. 4, Fig. 5, the middle position of the upper mold (1) is equipped with positioning convex platform (13), the intermediate core mole
(3) be equipped with and the positioning convex platform (13) compatible positioning groove (17), pass through draft mating surface realize core model positioning.By
In combining positioning using positioning convex platform (13) and " I " fonts key (15), cancels bolt and pin connection type, reduce technique mistake
Cheng Hemo seal operation and demoulding difficulty play an important role.
In embodiment, the positioning convex platform (13) is rectangular boss, and length and width 40mm-50mm, height is not less than 10mm, draft angle
Degree is designed as 5 ° -10 °, is designed between the positioning convex platform (13) and the groove (17) face using 1mm-2mm empty avoiding, the centre
Core model (3) wedge shape drafting angle be 5 ° -10 °, the " I " fonts key (15) highly be 10mm-20mm, drafting angle be 5 ° -
10 °, " I " fonts key (15) quantity is four, and upper semisection and oriented intermediate core mole (3) cooperation position, lower half
Section is respectively used to the connection core model of two sides four, carries out assembly cooperation positioning and (is equipped with inside core model and accommodates the " I " fonts key
Cavity), the stripper bolt hole (11) for demoulding and lifting carrying is equipped on five core models.
Such as Fig. 2, guiding coarse positioning is carried out by guide post (10) and guide sleeve between the upper mold (1) and lower die (2), it is described to lead
Column (10) is arranged on four angles of the upper mold (1), and described lead is set on the lower die (2) and the guide post (10) phase
Corresponding position, the upper mold (1) are diagonally equipped with locator (9), are accurately positioned by diagonal two locators (9).
It is described to be all made of continuous raised plateau into glue runner (6) and the plastic emitting runner (16) and set as shown in the shadow region Fig. 3, Fig. 4
Meter, raised head face and die face cooperate, and increase flow channel cavity region and mould contact surface product, and boss bottom surface and die face are reserved
0.5mm-4mm clearance fit forms resin channels
Bolt (18) mode locking, the upper mold die joint bolt and seal groove are used between the upper mold (1) and the lower die (2)
(4) 1mm-2mm empty avoiding is used to design between outside the region 10mm-20mm, empty avoiding region (12).
As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 6 and Fig. 7, the intermediate common edge in symmetrical two product will be designed into glue runner (6),
Corresponding lower die (2) middle position design glue-feeder (5), plastic emitting runner (16) separately design on other both sides, and gum outlet (14) is set
For meter in corresponding upper mold (1) two sides middle position, disengaging glue runner all uses one group of appropriately sized and height one group of boss, is used as
Runner, wherein boss face and mold cooperate, and play the role of supporting die cavity, preset clearance can provide resin channels between boss.
As shown in figures 1 to 6, two sides core model is split into two pieces, outside core model (7) and inside core model (8), and be designed to
Wedge shape cooperates with the upper mold (1) and assembles, and controls molding gap by upper and lower mould die joint, applies to core model on the outside of wedge shape and close
Mould power, then by the internal side core mould pressure lateral force of outside core model, it can be achieved that fiber preform side is compacted, while avoiding damage to fibre
Precast body is tieed up, relative position of the core model in die cavity is adjusted, reaches the size of control product, the mesh of internal soundness and form accuracy
's.
As shown in Figure 1, Figure 2, shown in Fig. 6 and Fig. 7, upper mold (1) die joint designs 1mm-2mm empty avoiding region (12) as needed,
Match mould convenient for more accurate control mold machining accuracy and later period, while improving processing efficiency, upper and lower mould by guide post (10) and
Guide sleeve guide-localization is carried out being accurately positioned upper/lower die and core model relative position by locator (9), be passed through die bolt (18)
Mode locking.
Two chamber of this kind mould molding semi-closed structure answers the RTM mold of material product when in use: first by upper mold (1) cavity surface
It lays flat upwards, intermediate core mole (3) is sling, when away from positioning convex platform (13) certain altitude, four " I " fonts keys (15) are pacified
It is attached on intermediate core mole (3), then is located on upper mold (1), with reference to Fig. 5, then by other four pieces of core models according to " work " word
Type key position is assembled, and when paving, one end core model is slowly sling, precast body one end is put into, and the other end starts paving, paving
After the completion of patch, two sides pellet is assembled, first assembling inside core model (7), then assemble outside core model (8), core model is unassembled can be made in place
Core model is beaten with tools such as rubber hammers, is fixed to core model relative position, guiding role is cooperated by guide post (10) and guide sleeve, and
The effect of locator (9) fine positioning, closes lower die (2), and uses die bolt (18) mode locking, then by 180 ° of die flip, keeps
For upper mold (1) upper, lower die (2), such as Fig. 6 and Fig. 7, carries out RTM technological operation under, to formed product, when demoulding, removes molding
Bolt (18) opens mold, first removes " I " fonts key (15), takes out intermediate core mole (3) and side core model (7 and 8), then again
Other core models are taken out one by one, can finally deviate from product.
The use processes such as the assembling of mold, demoulding are described in detail in this RTM mold use process, though product shape is half envelope
Space curved surface structure is closed, according to the two chamber RTM mold design scheme of a mould, it is ensured that product shape profile and dimensional accuracy are wanted
It asks, substantially reduces demoulding difficulty, and significantly improve production efficiency, reduce batch production cost.
Internal structure of the invention, design concept is described in detail according to diagrammatically shown embodiment above and uses function
Feature etc., the above description is only a preferred embodiment of the present invention, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to
It is above-mentioned basic not departing from the present invention according to the ordinary technical knowledge and customary means of this field according to above content of the invention
Design concept and conception under the premise of, it is made go out other diversified forms change, or modification, replacement or change, still without departing from
It, should all be within that scope of the present invention when specification is with covered design concept is illustrated.
Claims (9)
1. the RTM mold that a kind of two chamber of mould molding semi-closed structure answer material product, it is characterised in that: including upper die and lower die with
Inside molding core model, the upper mold is interior to be equipped with annular seal groove, so that forming closed cavity, the internal molding with the lower die
Core model is divided into five pieces, including the outside core model of left and right two, two inside core models and an intermediate core mole, is that wedge shape is set between core model
Meter, cooperation are assembled in the seal groove, and the intermediate core mole is keyed four core models of two sides by multiple " I " fonts, together
When die cavity is divided into left and right two chambers, the lower die is equipped with glue-feeder, cooperates the enterprising glue runner of internal molding core model real
Now to two chambers injecting resin, set that there are two plastic emitting runners on gum outlet and the internal molding core model to match in the upper mold
Close dumping row's bubble.
2. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: positioning convex platform is equipped with above the upper mold, the intermediate core mole is equipped with groove compatible with the positioning convex platform, realizes
Core model positioning.
3. a kind of two chamber of mould molding semi-closed structure according to claim 2 answers the RTM mold of material product, feature exists
In: the positioning convex platform is rectangular boss, and length and width 40mm-50mm is high to be not less than 10mm, and drafting angle is designed as 5 ° -10 °, institute
It states and is designed between positioning convex platform and the groove surface using 1mm-2mm empty avoiding.
4. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: the intermediate core mole wedge shape drafting angle is 5 ° -10 °, and the " I " fonts key height is 10mm-20mm, and drafting angle is
5°-10°。
5. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: the " I " fonts bond number amount is four, and upper semisection connect positioning with oriented intermediate core mole, and lower semisection is used respectively
Two sides core model is positioned in connection.
6. a kind of two chamber of mould molding semi-closed structure according to claim 3 answers the RTM mold of material product, feature exists
In: the stripper bolt hole for demoulding and lifting carrying is equipped on 5 core models of the internal molding core model.
7. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: guiding is carried out by guide pillars and bushes between the upper die and lower die and is fixedly connected, the upper mold is arranged in the guide post
On four angles, described lead is set on the lower die and the corresponding position of the guide post, and the diagonal of the upper mold is equipped with positioning
Device is accurately positioned by diagonal two locators.
8. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: the intermediate common edge that two chambers of left and right are arranged in into glue runner, the i.e. middle part of intermediate core mole, the glue-feeder setting exist
The middle position of corresponding lower die, the plastic emitting runner separately design on other both sides, and the gum outlet setting is in corresponding upper mold two
The middle position of side, described to be all made of continuous raised plateau design into glue runner and the plastic emitting runner, raised head face is matched with die face
It closes, increases flow channel cavity region and mould contact surface product, boss bottom surface and die face are reserved 0.5mm-4mm clearance fit, formed
Resin channels.
9. a kind of two chamber of mould molding semi-closed structure according to claim 1 answers the RTM mold of material product, feature exists
In: bolt mode locking, the upper mold die joint bolt and the region seal groove 10mm-20mm are used between the upper mold and the lower die
It is outer to be designed using 1mm-2mm empty avoiding.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110405989A (en) * | 2019-08-31 | 2019-11-05 | 零八一电子集团四川天源机械有限公司 | The molding die of flat type bag shell type antenna house |
| CN111055512A (en) * | 2019-12-30 | 2020-04-24 | 中国航空制造技术研究院 | Composite material component preparation tool and method for co-curing reinforcing sheet |
| CN112092411A (en) * | 2020-07-31 | 2020-12-18 | 北京卫星制造厂有限公司 | Forming tool and method for small-caliber long-size non-uniform-thickness thin rectangular pipe fitting |
| CN112454762A (en) * | 2020-10-30 | 2021-03-09 | 济南方德利模具有限公司 | Mold and manufacturing method thereof |
| CN112536944A (en) * | 2020-04-13 | 2021-03-23 | 廊坊市飞泽复合材料科技有限公司 | Two chamber forming die of battery package HP-RTM |
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