CN106042299B - Automobile storage battery housing moulding precision die - Google Patents

Automobile storage battery housing moulding precision die Download PDF

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Publication number
CN106042299B
CN106042299B CN201610671222.5A CN201610671222A CN106042299B CN 106042299 B CN106042299 B CN 106042299B CN 201610671222 A CN201610671222 A CN 201610671222A CN 106042299 B CN106042299 B CN 106042299B
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CN
China
Prior art keywords
cavity
sliding block
storage battery
fixed
battery housing
Prior art date
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CN201610671222.5A
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Chinese (zh)
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CN106042299A (en
Inventor
姜校平
戚永幸
上田雄史
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SZEPAK PRECISION (WUXI) CO Ltd
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SZEPAK PRECISION (WUXI) CO Ltd
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Publication of CN106042299A publication Critical patent/CN106042299A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/33Moulds having transversely, e.g. radially, movable mould parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/4005Ejector constructions; Ejector operating mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/72Heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • B29L2031/7146Battery-cases

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A kind of automobile storage battery housing moulding precision die disclosed in this invention, including preceding mould and rear mold, front cavity is fixed on cope plate, rear cavity is fixed on cope plate, it is and corresponding with the position of front cavity, front cavity and rear cavity are mutually closed the die cavity for forming product after molding, die cavity side is equipped with core-pulling slide block, and core-pulling slide block is embedded in shape between front cavity and rear cavity, the both sides of rear cavity are equipped with sliding block, core-pulling slide block is connected on sliding block, and two sliding blocks are guided by two inclined guide pillars of relatively independent setting and slided, inclined guide pillar is fixed on the both sides of front cavity, and sliding block is inserted into lower end, the lower section of the runner is connected with die cavity, resetting apparatus is equipped between rear cavity and sliding block.The automobile storage battery housing moulding precision die of the present invention, improve the performance of plastic product, short molding cycle, production efficiency are high, and melt is small to the abrasion of accumulator mold, can forming shape is complicated in large quantity, picture on surface and label is clear, dimensional accuracy is high plastic.

Description

Automobile storage battery housing moulding precision die
Technical field
The present invention relates to a kind of precision die, especially a kind of automobile storage battery housing moulding precision die.
Background technology
Automobile storage battery is a kind of device for converting chemical energy into electric energy, belongs to DC power supply.And accumulator housing needs Have the features such as corrosion-resistant, high temperature resistant, should have to the mold of automobile storage battery housing injection molding in this way uniform in shaping it is stable, Service life length, precision height, simple production process, low energy consumption and molding after the completion of Product Precision it is higher, due to automobile store Moulding of the battery case for volume greatly, more than muscle position, the muscle position many places that solve product in the prior art are difficult to realize uniformly note The practical problems such as modeling and lossless demoulding, it is necessary to the design of some special constructions is needed to simplify automobile storage battery housing mould structure, Simple so as to fulfill product die joint, hot melt filling is uniform, and demoulding is easy, and automobile storage battery housing mould is made to design more adduction Reason.
Invention content
A kind of raising hot melt filling designed the purpose of the present invention is to solve the deficiency of above-mentioned technology is uniform, makes With the high automobile storage battery housing moulding precision die of long lifespan and production efficiency.
Automobile storage battery housing moulding precision die designed by the present invention, including being mutually matched and agreeing with preceding mould with after Mould, the preceding mould include preceding mould fixed plate, water gap plate, cope plate and front cavity successively from top to bottom, and the rear mold is from top to bottom Include rear cavity, lower template, support block and rear mold fixed plate successively, which is equipped with locating ring, the lower section of locating ring Equipped with sprue bush, runner is equipped in the sprue bush, the front cavity is fixed on the bottom surface of cope plate, and the rear cavity is fixed on The top surface of template, and it is corresponding with the position of front cavity, front cavity and rear cavity are mutually closed the die cavity for forming product after molding, should The both sides of die cavity are equipped with core-pulling slide block, and core-pulling slide block is embedded in shape between front cavity and rear cavity, the rear cavity Both sides are equipped with sliding block, which is connected on sliding block, and two sliding blocks are tiltedly led by two of relatively independent setting Column guiding is slided, which is fixed on the both sides of front cavity, and sliding block, the lower section of the runner and die cavity are inserted into lower end Connection is equipped with resetting apparatus between the outside portion of the rear cavity and sliding block;The diameter and length of side inclined guide pillar therein are equal More than the inclined guide pillar of opposite side, have in die sinking and molding and be first turned on and be closed side bevel lead column's diameter and the slightly larger position of length The sliding block at place is put, then opens and closes the sliding block at side bevel lead column's diameter and the slightly smaller position of length.
Further, the resetting apparatus includes spring, is equipped on the sliding block close to the one side on the outside of rear cavity multiple Position slot, the spring are filled in reseting groove, and spring one end contradicts and resets trench bottom, and the other end contradicts the outside portion of rear mold people.
Further, the inclined guide pillar is fixed on the both sides of rear cavity, and specific fixed structure is:The two of the front cavity Side is additionally provided with wedge block, and the lower end of the inclined guide pillar, which from top to bottom tilts, runs through and stretch out wedge block, and head clamping is solid Due to the top of wedge block, which is fixed by bolt and cope plate.
Further, the lower part of the wedge block is in incline equipped with the medial surface with the matched wedging slot of sliding block, the wedging slot Ramp-like, the lateral surface of the sliding block is equipped with exactly matches the inclined surface being bonded with oblique wedging slot medial surface, described oblique The lower end of guide post is located in wedging slot, and inclined guide pillar tilts perforative angle of inclination and oblique wedging slot medial surface Angle of inclination it is consistent.
Further, the rear of the sliding block is equipped with caging bolt, which connect with lower template.
Further, there is resetting spring between the thimble panel and lower template.
Further, Ejector Retainer Plate, thimble panel, ejector sleeve and thimble are further included, the Ejector Retainer Plate and thimble panel are respectively positioned on It is connected in formed space by support block between lower template and rear mold fixed plate, one end of the ejector sleeve sequentially passes through thimble face The boss of plate, lower template and rear cavity, then the other end be connected on thimble panel, one end of the thimble sequentially passes through rear mold It is used to eject the accumulator housing product of injection molding, the thimble panel and Ejector Retainer Plate after fixed plate, Ejector Retainer Plate and ejector sleeve It is fixed to each other, and positioned at the top of Ejector Retainer Plate.
Further, the top surface of the thimble panel is fixed with buffer limit block.
Further, cooling duct and cooling vent are further included, the cooling duct be respectively placed in cope plate, front cavity, lower template and after In mode, which is located at the side of cope plate and lower template, and cooling duct is interconnected with cooling vent.
Further, the ejection piece of the ejector sleeve and thimble as ejection Injection Molding Products, and be uniformly distributed in rear mold At least four groups of ejection pieces are set.
Automobile storage battery housing moulding precision die designed by the present invention, carries out using by plastics inside temperature control box The temperature of preheating, plastics preheating temperature and thermoplastic shaping is 180-200 degrees Celsius, after plastics reach injection requirement, then will Plastics after preheating are poured into be heated in injection molding machine charging basket, and hot melting temperature is 280-290 degrees Celsius so that greatly improves modeling The processability of part, it is thus also avoided that the risk of plastic bubble is generated, meanwhile, the short molding cycle of thermoplastic injection molding, Specially 5-10 seconds one set product of molding, improves production efficiency, and production efficiency improves 3-4 times than existing mold, melts Material is small to the abrasion of accumulator mold, can forming shape is complicated in large quantity, picture on surface and label are clear, dimensional accuracy is high Plastic, further, injection-moulding step have the processes such as injection-pressurize-cooling-plastic demoulding to form cycle period, thus note The type of being moulded into has the characteristics that periodic, while its mold precision and product precision are up to 0.01mm, thermoplastic note 4-5 of the speed than promotion of molding molding cycle is moulded, product size precision may be up to 0.03mm.
Description of the drawings
Fig. 1 is the overall structure diagram of embodiment 1;
Fig. 2 is the partial view of embodiment 1;
Fig. 3 is the die sinking schematic diagram of embodiment 1;
Fig. 4 is the combining structure schematic diagram of embodiment 1.
In figure:Preceding mould fixed plate 1, water gap plate 2, cope plate 3, lower template 4, support block 5, rear mold fixed plate 6, front cavity 7, after Mode 8, thimble panel 10, thimble 11, wedge block 12, sliding block 13, inclined guide pillar 14, core-pulling slide block 15, resets 11 bottom plate 9 of thimble Device 16, spring 161, locating ring 17, runner 18, sprue bush 19, buffer limit block 20, cooling vent 21, cooling duct 22, reseting groove 23rd, wedging slot 24, inclined surface 25, resetting spring 26, ejector sleeve 27.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art's all other embodiments obtained belong to what the present invention protected Range.
Embodiment 1:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the described automobile storage battery housing moulding precision die of the present embodiment, Including mould before being mutually matched and agreeing with and rear mold, the preceding mould includes preceding mould fixed plate 1, water gap plate 2, upper mold successively from top to bottom Plate 3 and front cavity 7, the rear mold includes rear cavity 8, lower template 4, support block 5 and rear mold fixed plate 6 successively from top to bottom, before this Mould fixed plate 1 is equipped with locating ring 17, and the lower section of locating ring 17 is equipped with sprue bush 19, runner 18 is equipped in the sprue bush 19, It is characterized in that:The front cavity 7 is fixed on the bottom surface of cope plate 3, and the rear cavity 8 is fixed on the top surface of cope plate 3, and with it is preceding The position of mode 7 corresponds to, and front cavity 7 and rear cavity 8 are mutually closed the die cavity for forming product after molding, and the both sides of the die cavity are set There is core-pulling slide block 1513, and core-pulling slide block 1513 is embedded in shape between front cavity 7 and rear cavity 8, the both sides of the rear cavity 8 Portion is equipped with sliding block 13, which is connected on sliding block 13, and two sliding blocks 13 pass through the two of relatively independent setting A guiding of inclined guide pillar 14 is slided, which is fixed on the both sides of front cavity 7, and sliding block 13, the stream are inserted into lower end The lower section in road 18 is connected with die cavity, and resetting apparatus 16 is equipped between the outside portion of the rear cavity 8 and sliding block 13;Side therein The diameter and length of inclined guide pillar 14 are all higher than the inclined guide pillar 14 of opposite side, and have in die sinking and molding and be first turned on and close Unify the sliding block 13 at 14 diameter of skew back guide post and the slightly larger position of length, then open and close again 14 diameter of side inclined guide pillar and Sliding block 13 at the slightly smaller position of length, successively incremental pattern have the function of preferably to protect product, improve product Quality;Mold is molded when Injection Motor Template is opened, and inclined guide pillar 14 is connected with wedge block 12 by being interference fitted, inclined guide pillar 14 Fixed plate by screw connection on cope plate 3, stir rear mode slider 13 and open by front and rear film die sinking, inclined guide pillar 14;Mode slider afterwards 13 with press strip transition by being connected in lower template 4, and press strip is by screw connection in lower template 4.During die sinking, inclined guide pillar 14, by mould opening force, core pulling are completed in the guiding lower band movable slider 13 of guide rail.
Spring 161 is included by the resetting apparatus 16 in the present embodiment, close to 8 outside of rear cavity on the sliding block 13 One side be equipped with reseting groove 23, which fills in reseting groove 23, and 161 one end of spring contradicts 23 bottom of reseting groove, separately One end contradicts the outside portion of rear cavity 8.After sliding block translation can be achieved further preferably reset.
The both sides of front cavity 7 are fixed in the present embodiment by the inclined guide pillar 14, specific fixed structure is:It is described The both sides of front cavity 7 are additionally provided with wedge block 12, and the lower end of the inclined guide pillar 14, which from top to bottom tilts, runs through and stretch out wedging Block 12, and head is connected and fixed in the top of wedge block 12, which is fixed by bolt and cope plate 3;During molding, borrow Combination die power makes sliding block 13 be drawn close to 8 boss of rear cavity, and 1513 stroke of core-pulling slide block is by opening stroke, inclined guide pillar 14 Length and inclination angle determine that further, for wedge block 12 in molding, having prevents core-pulling slide block 1513 from being set after resetting The stuffing pressure of fat and locking part when retreating, the lower part of the wedge block 12 be equipped with 13 matched wedging slot 24 of sliding block, One medial surface of the wedging slot 24 is oblique, and the lateral surface of the sliding block 13 is equipped with and oblique 24 medial surface of wedging slot The inclined surface 25 of fitting is exactly matched, the lower end of the inclined guide pillar 14 is located in wedging slot 24, and the inclination of inclined guide pillar 14 is passed through The angle of inclination worn is consistent with the angle of inclination of oblique 24 medial surface of wedging slot, has in molding and die sinking efficient Smooth performance, and working efficiency higher, while effect when locking is more preferable.
Caging bolt is equipped with by the rear of the sliding block 13 in the present embodiment, which connect with lower template 4, prevents Only mold causes sliding block 13 and core-pulling slide block 15 to slide in work process due to the vibrations of various injection molding machines so that reinstalls Occurring the molding accumulator housing precision of institute afterwards reduces, and also influences working efficiency.By further including 11 bottom of thimble in the present embodiment Plate 9,11 panel 10 of thimble, ejector sleeve 27 and thimble 11,11 bottom plate 9 of thimble and 11 panel 10 of thimble are respectively positioned on lower template 4 with after Connected in formed space by support block 5 between mould fixed plate 6, one end of the ejector sleeve 27 sequentially pass through 11 panel 10 of thimble, The boss of lower template 4 and rear cavity 8, then the other end be connected on 11 panel 10 of thimble, one end of the thimble 11 is passed through successively It wears after rear mold fixed plate 6,11 bottom plate 9 of thimble and ejector sleeve 27 for ejecting the accumulator housing product of injection molding, the thimble 11 Panel 10 is fixed to each other with 11 bottom plate 9 of thimble, and positioned at 11 bottom plate 9 of thimble top, convenient for accumulator housing ejection effect, Structure has more compactedness.
Buffer limit block 20 is fixed with by the top surface of 11 panel 10 of thimble in the present embodiment, is prevented in ejection electric power storage Occur during the shell product of pond top plate be in direct contact with template be bonded moulding mould vibrations and lead to damage of product.
By having resetting spring 26 between the thimble panel 10 and lower template 4 in the present embodiment so that pushed up during die sinking Needle, Ejector Retainer Plate and thimble panel eject product after moving up, and realize the reset of thimble.By also wrapping in the present embodiment Cooling duct 22 and cooling vent 21 are included, which is respectively placed in cope plate 3, front cavity 7, lower template 4 and rear cavity 8, should Cooling vent 21 is located at the side of cope plate 3 and lower template 4, and cooling duct 22 is interconnected with cooling vent 21, convenient for hot melt It can more quickly reach cooling and molding after the completion of being filled in die cavity.
It is used as the ejection piece of ejection Injection Molding Products in the present embodiment by the ejector sleeve 27 and thimble 11, and in rear mold Inside it is uniformly distributed setting at least four groups of ejection pieces so that the accumulator housing product after the completion of ejection is molded is not damaged, Improve working efficiency.
The operation principle of injection molding:Mold is fixed on injection molding machine, and injection molding machine is divided into fixed part and movable part, mould Mould is fixed on injection molding machine fixed part before having in the state of molding, and rear mold is fixed on the movable part of injection molding machine, injection molding Cheng Wei:First plastics inside temperature control box are preheated, note is poured into after plastics reach requirement, then by the plastics after preheating Inside molding machine charging basket, after the heating of charging basket and the thawing processing of injection molding machine, then the effect of the screw rod and plunger by injection molding machine Entered in accumulator housing die casting system by injection molding machine nozzle down, then flow into accumulator housing injection mold rear cavity 8 Inside the die cavity formed of front cavity 7, the plastics of melting state harden under physics chemical action forms plastic products, Injection moulding is the process of a cycle, and each period mainly includes:Quantifying feed-fusion plastification-pressure injection-mold filling is cold But-and open mould pickup, mold closing again is taken out after plastic again, carries out next cycle.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are various under the enlightenment of the present invention The product of form, however, make any variation in its shape or structure, it is every that there is skill identical or similar to the present application Art scheme, is within the scope of the present invention.

Claims (10)

1. a kind of automobile storage battery housing moulding precision die, including mould before being mutually matched and agreeing with and rear mold, the preceding mould Include preceding mould fixed plate (1), water gap plate (2), cope plate (3) and front cavity (7) successively from top to bottom, the rear mold is from top to bottom Include rear cavity (8), lower template (4), support block (5) and rear mold fixed plate (6) successively, which is equipped with positioning Ring (17), the lower section of locating ring (17) are equipped with sprue bush (19), runner (18) are equipped in the sprue bush (19), it is characterised in that: The front cavity (7) is fixed on the bottom surface of cope plate (3), and the rear cavity (8) is fixed on the top surface of cope plate (3), and with it is preceding The position of mode (7) corresponds to, and front cavity (7) and rear cavity (8) are mutually closed the die cavity of composition product after molding, and the two of the die cavity Side is equipped with core-pulling slide block (15), and the embedded shape of core-pulling slide block (15) is located between front cavity (7) and rear cavity (8), after described The both sides of mode (8) are equipped with sliding block (13), which is connected on sliding block (13), and two sliding blocks (13) are logical Two inclined guide pillars (14) guiding for crossing relatively independent setting is slided, which is fixed on the both sides of front cavity (7), and Sliding block (13) is inserted into lower end, and the lower section of the runner (18) is connected with die cavity, the outside portion of the rear cavity (8) and sliding block (13) resetting apparatus (16) is equipped between;The diameter and length of side inclined guide pillar (14) therein are all higher than the inclined guide pillar of opposite side (14), there is the sliding block being first turned on and be closed at side inclined guide pillar (14) diameter and the slightly larger position of length in die sinking and molding (13), then sliding block (13) at side inclined guide pillar (14) diameter and the slightly smaller position of length is opened and closed.
2. automobile storage battery housing moulding precision die according to claim 1, it is characterised in that:The resetting apparatus (16) including spring (161), reseting groove (23) is equipped with close to the one side on the outside of rear cavity (8) on the sliding block (13), it should Spring (161) is filled in reseting groove (23), and spring (161) one end contradicts reseting groove (23) bottom, and the other end contradicts rear cavity (8) outside portion.
3. automobile storage battery housing moulding precision die according to claim 1, it is characterised in that:The inclined guide pillar (14) both sides of front cavity (7) are fixed on, specific fixed structure is:The both sides of the front cavity (7) are additionally provided with wedging Block (12), the lower end of the inclined guide pillar (14), which from top to bottom tilts, runs through and stretches out wedge block (12), and head connects and fixes In the top of wedge block (12), the wedge block (12) is fixed by bolt and cope plate (3).
4. automobile storage battery housing moulding precision die according to claim 3, it is characterised in that:The wedge block (12) lower part is equipped with wedging slot (24) matched with sliding block (13), and a medial surface of the wedging slot (24) is oblique, described The lateral surface of sliding block (13) is equipped with exactly matches the inclined surface being bonded (25) with oblique wedging slot (24) medial surface, described The lower end of inclined guide pillar (14) is located in wedging slot (24), and inclined guide pillar (14) tilt perforative angle of inclination with it is oblique Wedging slot (24) medial surface angle of inclination it is consistent.
5. automobile storage battery housing moulding precision die according to claim 1, it is characterised in that:The sliding block (13) Rear be equipped with caging bolt (28), which connect with lower template (4).
6. automobile storage battery housing moulding precision die according to claim 1, it is characterised in that:Further include thimble bottom Plate (9), thimble panel (10), ejector sleeve (27) and thimble (11), the Ejector Retainer Plate (9) and thimble panel (10) are respectively positioned on lower template (4) it is connected in formed space by support block (5) between rear mold fixed plate (6), one end of the ejector sleeve (27) sequentially passes through The boss of thimble (11) panel (10), lower template (4) and rear cavity (8), then the other end be connected on thimble panel (10), One end of the thimble (11) sequentially passes through rear mold fixed plate (6), Ejector Retainer Plate (9) and ejector sleeve (27) and is used to eject injection molding afterwards Accumulator housing product, which is fixed to each other with thimble (11) bottom plate (9), and positioned at Ejector Retainer Plate (9) Top.
7. automobile storage battery housing moulding precision die according to claim 6, it is characterised in that:The thimble panel (10) top surface is fixed with buffer limit block (20).
8. automobile storage battery housing moulding precision die according to claim 6, it is characterised in that:The thimble panel (10) there is resetting spring (26) between lower template (4).
9. automobile storage battery housing moulding precision die according to claim 1, it is characterised in that:Further include cooling duct (22) and cooling vent (21), the cooling duct (22) are respectively placed in cope plate (3), front cavity (7), lower template (4) and rear cavity (8) Interior, the cooling vent (21) is positioned at cope plate (3) and the side of lower template (4), and cooling duct (22) and cooling vent (21) are mutual Connection.
10. automobile storage battery housing moulding precision die according to claim 6, it is characterised in that:The ejector sleeve (27) and thimble (11) is as the ejection piece for ejecting Injection Molding Products, and setting at least four groups of tops are uniformly distributed in rear mold Go out part.
CN201610671222.5A 2016-08-15 2016-08-15 Automobile storage battery housing moulding precision die Active CN106042299B (en)

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CN105415597A (en) * 2015-08-24 2016-03-23 思柏精密模具注塑(无锡)有限公司 Precise mold for battery shell of camera
CN205202027U (en) * 2015-10-21 2016-05-04 张家港市乐余百润塑料模具厂 Oblique guide pillar side injection mold of loosing core
CN205969796U (en) * 2016-08-15 2017-02-22 思柏精密模具注塑(无锡)有限公司 Accurate mould of automobile storage battery casing injection molding

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