CN106113414A - A kind of mould making electric source line interface and method - Google Patents

A kind of mould making electric source line interface and method Download PDF

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Publication number
CN106113414A
CN106113414A CN201610778093.XA CN201610778093A CN106113414A CN 106113414 A CN106113414 A CN 106113414A CN 201610778093 A CN201610778093 A CN 201610778093A CN 106113414 A CN106113414 A CN 106113414A
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CN
China
Prior art keywords
slide block
core
groove
mold core
plate
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Granted
Application number
CN201610778093.XA
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Chinese (zh)
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CN106113414B (en
Inventor
蔡伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yuhuan New Huachen Electric Appliance Co Ltd
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Yuhuan New Huachen Electric Appliance Co Ltd
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Priority to CN201610778093.XA priority Critical patent/CN106113414B/en
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    • 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
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • 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
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065Positioning or centering articles in the mould

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

Abstract

The invention belongs to electric source line interface technical field, refer specifically to a kind of simple in construction, mould and the method for electric source line interface can be made, including dynamic model and cover half;Cover half includes lower mold core fixed plate, lower mold core fixed plate is provided with core cavity one, core cavity one is provided with lower mold core;Dynamic model includes upper mold core fixed plate, upper mold core fixed plate is provided with core cavity two, core cavity two is provided with upper mold core;Upper mold core and the involutory setting of lower mold core;Core rod assembly it is provided with in core cavity one;Core rod assembly includes that slide block lock dog, slide block fixed plate and terminal slide block, the outer wall of slide block lock dog are arranged with the inwall laminating of core cavity one;Being provided with at least one die cavity on terminal slide block, die cavity is adaptive with upper and lower core rod;Being provided with several movable fuses arranged on die cavity, fuse is fixed in described slide block fixed plate, is arranged with line sequence location-plate between upper mold core and lower mold core, and line sequence location-plate is flexibly connected with terminal slide block;The draw-in groove corresponding with several fuses it is provided with on line sequence location-plate.

Description

A kind of mould making electric source line interface and method
Technical field
The invention belongs to electric source line interface technical field, refer specifically to a kind of mould making electric source line interface and method.
Background technology
Along with the raising of people's living standard, electrical equipment has become in people's life and has been compared the part not lacked, and power supply The necessary parts that line uses as electrical equipment, the quality of its performance directly influences the service life of electrical equipment, electric source line interface conduct One important component part of power line, its quality produced and technique also have received and pays close attention to widely.At present, we are existing Electric source line interface is mainly made up of plastic cement core and conductive insert, and conductive insert is divided into ground wire pole inserted sheet, positive pole to insert Sheet, negative pole inserted sheet, during production, need to be inserted in plastic cement core conductive insert according to relatively suitably angle so that it is with Plastic cement core is connected to form the electric source line interface that we are common.
On existing market, the electric source line interface of multiplex roles not, is traced it to its cause and is because the electric source line interface pair of multiplex roles Mould requires height, and the structure of mould is complicated, is difficult to manufacture.
Summary of the invention
In order to overcome defect of the prior art, it is an object of the invention to provide a kind of simple in construction, power supply can be made The mould of line interface and method.
The object of the present invention is achieved like this:
A kind of mould making electric source line interface, including dynamic model and cover half;Described cover half includes lower mold core fixed plate, described It is provided with core cavity one in lower mold core fixed plate, core cavity one is provided with lower mold core;Described dynamic model includes upper mold core fixed plate, described It is provided with core cavity two in upper mold core fixed plate, core cavity two is provided with upper mold core;Upper mold core and the involutory setting of lower mold core;Described core It is provided with in chamber one and core cavity one close-fitting and dismountable core rod assembly;Core rod assembly include slide block lock dog, slide block fixed plate and Terminal slide block, slide block lock dog is fixing with slide block fixed plate to be connected, and the outer wall of slide block lock dog is arranged with the inwall laminating of core cavity one;End Being provided with at least one die cavity on sub-slide block, die cavity is adaptive with upper and lower core rod;Several movable settings it are provided with on described die cavity Fuse, described fuse is fixed in described slide block fixed plate, is arranged with line sequence location-plate between described upper mold core and lower mold core, Line sequence location-plate is flexibly connected with terminal slide block;It is provided with the draw-in groove corresponding with several fuses on described line sequence location-plate.
The present invention is further arranged to: be provided with fuse groove one in described slide block fixed plate, and described terminal slide block is arranged Fuse groove two, described fuse is had to be fixed on fuse groove one and pass fuse groove two.
The present invention is further arranged to: described terminal slide block and line sequence location-plate make both position by alignment pin and connect Connect.
The present invention is further arranged to: several described fuses are arranged to two rows, line sequence location-plate is provided with The two rows draw-in groove that two rows fuse is correspondingly arranged, described lower mold core is provided with and the draw-in groove of the lower involutory setting of row's draw-in groove One, upper mold core is provided with and the draw-in groove two of the upper involutory setting of row's draw-in groove.
The present invention is further arranged to: be provided with the groove one towards die cavity in described upper mold core, described lower mold core sets It is equipped with the groove three towards die cavity, in groove one, is provided with projection one, projection one is provided with draw-in groove two, is provided with in groove three Projection two, projection two is provided with draw-in groove one, line sequence location-plate is provided with projection three, the upper surface of projection three is arranged oriented The step one of indent, step one is provided through draw-in groove, and the lower surface of projection three is provided with the step two concaved, platform Being provided through lower bayonet slot on rank two, projection one compresses with described step one, makes draw-in groove and draw-in groove two form binder passage one, Projection two compresses with described step two, makes lower bayonet slot and draw-in groove one form binder passage two.
The present invention is further arranged to: the upper end of described slide block lock dog is provided with inclined plane one, and described core cavity two sets It is equipped with and forms wedge hold-down mechanism with the inclined plane two of inclined plane one adaptation, inclined plane one and inclined plane two.
The present invention is further arranged to: offers an opening on described slide block lock dog and outwardly and runs through the T-shaped of inclined plane one Groove.
A kind of method using above-mentioned mould, comprises the following steps:
A. the terminal of power line is inserted in fuse, the power line being exposed on the external is placed into the draw-in groove on line sequence location-plate In;
B. slide block lock dog, slide block fixed plate and terminal slide block are put into the core cavity one in lower mold core fixed plate, and will Line sequence location-plate is placed in lower mold core;
C. mould covers, and upper mold core fixed plate is locked with slide block lock dog, and upper mold core is involutory with line sequence location-plate, then notes Mould;
D. after completing injection, opening upper mold core fixed plate, make slide block fixed plate depart from slide block lock dog, upper mold core departs from line sequence Location-plate;
E. the top board on mould drive thimble make slide block lock dog, slide block fixed plate, terminal slide block and line sequence location-plate together with Injecting products is departed from simultaneously;
F. terminal slide block is fixed on fixture, then pulls slide block lock dog, make in slide block lock dog band movable slider fixed plate Fuse and terminal slide block depart from;
G. take out in power line draw-in groove from line sequence location-plate, complete the demoulding.
The present invention highlights and useful having the technical effect that by slide block lock dog, slide block fixed plate and end compared to existing technology The setting of sub-slide block is easy to mould and is assembled the precision also allowing for regulating mould;The movable fuse arranged can be so that product after molding The demoulding;And power line can be carried out spacing and fix by arranging of line sequence location-plate, during injection mo(u)lding, power line will not occur Displacement, the terminal of power line also will not move, and makes the product quality of injection mo(u)lding be guaranteed;Meanwhile, by such mould Realize the making to electric source line interface.
Accompanying drawing explanation
Fig. 1 is the structure sectional view of the present invention;
Fig. 2 is the detonation configuration schematic diagram of the present invention;
Fig. 3 is upper and lower mould cored structure sectional view of the present invention;
Fig. 4 is the A portion enlarged drawing in Fig. 3;
Fig. 5 is the detonation configuration schematic diagram of upper and lower core rod and terminal slide block;
Fig. 6 is the structural representation of upper mold core of the present invention;
Fig. 7 is the partial structurtes schematic diagram of line sequence location-plate of the present invention and upper and lower core rod.
Label implication in figure:
1-lower mold core fixed plate;2-core cavity one;3-lower mold core;4-upper mold core fixed plate;5-core cavity two;6-upper mold core;7- Slide block lock dog;8-slide block fixed plate;9-terminal slide block;10-die cavity;11-punch;12-line sequence location-plate;13-draw-in groove;14-core Pilot trench one;15-fuse groove two;16-alignment pin;17-draw-in groove one;18-draw-in groove two;19-groove one;21-groove three;23-projection One;24-projection two;25-projection three;26-step one;27-step two;28-binder passage one;29-binder passage two;30-inclines Inclined-plane one;31-inclined plane two;32-T type groove;33-fuse;The upper draw-in groove of 34-;35-lower bayonet slot.
Detailed description of the invention
With specific embodiment, the invention will be further described below in conjunction with the accompanying drawings:
Seeing shown in Fig. 1 to Fig. 7, a kind of mould making electric source line interface, including dynamic model and cover half;Described cover half includes Lower mold core fixed plate 1, described lower mold core fixed plate 1 is provided with core cavity 1, core cavity 1 is provided with lower mold core 3;Described dynamic Mould includes upper mold core fixed plate 4, described upper mold core fixed plate 4 is provided with core cavity 25, core cavity 25 is provided with upper mold core 6; Upper mold core 6 and the involutory setting of lower mold core 3;It is provided with in described core cavity 1 and core cavity 1 close-fitting and dismountable core rod assembly; Core rod assembly includes slide block lock dog 7, slide block fixed plate 8 and terminal slide block 9, and slide block lock dog 7 is fixing with slide block fixed plate 8 to be connected, The outer wall of slide block lock dog 7 is arranged with the inwall laminating of core cavity 1;At least one die cavity 10, die cavity 10 it is provided with on terminal slide block 9 Adaptive with upper and lower core rod 3, the present embodiment is provided with the arc punch 11 of outside projection, on terminal slide block 9 on upper and lower core rod 3 Die cavity 10 be and the die of arc punch 11 adaptation that arc punch 11 and die can according to difform product design not Same adapted shape;Being provided with several movable fuses 33 arranged on described die cavity 10, described fuse 33 is fixed on described cunning In block fixed plate 8, between described upper mold core 6 and lower mold core 3, it is arranged with line sequence location-plate 12, line sequence location-plate 12 and terminal slide block 9 are flexibly connected;It is provided with the draw-in groove 13 corresponding with several fuses 33 on described line sequence location-plate 12, by slide block lock dog 7, slides The setting of block fixed plate 8 and terminal slide block 9 is easy to mould and is assembled the precision also allowing for regulating mould;The movable fuse 33 arranged can So that the demoulding of product after molding, fuse 33 can realize the effect of location as guide pillar simultaneously;And line sequence location-plate 12 Arrange and power line can be carried out spacing and fix, during injection mo(u)lding, power line will not be subjected to displacement, and the terminal of power line is also Will not move, make the product quality of injection mo(u)lding be guaranteed.
It is further arranged to: be provided with fuse groove 1 in described slide block fixed plate 8, described terminal slide block 9 is provided with Fuse groove 2 15, described fuse 33 is fixed on fuse groove 1 and passes fuse groove 2 15, and such fuse 33 is fixed on fuse On groove 1, fuse 33 can be made to depart from fuse groove 2 15, it is simple to the product just demoulding, simultaneously fuse 33 and fuse groove two The cooperation of 15 makes fuse 33 that terminal slide block 9 is served guide effect, makes coordinating of the terminal slide block 9 after reset and lower mold core 3 More accurate, improve the precision produced.
It is further arranged to: described terminal slide block 9 is made both position with line sequence location-plate 12 by alignment pin 16 and is connected, So facilitate power line to pass through line sequence location-plate 12 to be connected with terminal slide block 9, and facilitate line sequence location-plate 12 moving to lower mold Time on core 3, power line will not offset, and improves product success rate after moulding, also improves the safety of product.
It is further arranged to: several described fuses 33 are arranged to two rows, and line sequence location-plate 12 is provided with upper The two rows draw-in groove 13 that lower two row's fuses 33 are correspondingly arranged, described lower mold core 3 is provided with and the lower involutory setting of row's draw-in groove 13 Draw-in groove 1, upper mold core 6 is provided with and the draw-in groove 2 18 of the upper involutory setting of row's draw-in groove 13, in the present embodiment be preferably arrange Having the upper row's fuse 33 on left and right two die cavities 10, and each described die cavity 10 to be placed equidistant 5, lower row's fuse 33 equidistantly sets Being equipped with 6, user can increase and decrease different fuse 33 numbers according to different product needed, or inserts according to different demands If different number of power lines.
It is further arranged to: be provided with the groove 1 towards die cavity 10 in described upper mold core 6, described lower mold core 3 sets It is equipped with the groove 3 21 towards die cavity 10, in groove 1, is provided with projection 1, projection 1 is provided with draw-in groove 2 18, recessed It is provided with projection 2 24 in groove 3 21, projection 2 24 is provided with draw-in groove 1, line sequence location-plate 12 is provided with projection 3 25, It is provided with the step 1 concaved on the upper surface of projection 3 25, step 1 is provided through draw-in groove 34, projection three It is provided with the step 2 27 concaved on the lower surface of 25, step 2 27 is provided through lower bayonet slot 35, projection 1 and institute Stating step 1 to compress, make draw-in groove 34 form binder passage 1 with draw-in groove 2 18, projection 2 24 supports with described step 2 27 Pressure, makes lower bayonet slot 35 form binder passage 2 29 with draw-in groove 1, so can be fixed the power line after matched moulds, it is to avoid There is doubling between the power line that power line is adjacent when injection, be also prevented from power line and be shifted over when injection, make to produce The product safety come is reliable.
It is further arranged to: the upper end of described slide block lock dog 7 is provided with inclined plane 1, described core cavity 25 is arranged Having and the inclined plane 2 31 of inclined plane 1 adaptation, inclined plane 1 and inclined plane 2 31 form wedge hold-down mechanism, so carry The compactness that high terminal slide block 9 directly coordinates with upper and lower core rod 3, it is to avoid the generation of overlap, improves product quality.
It is further arranged to: offer an opening on described slide block lock dog 7 and outwardly and run through the T-slot of inclined plane 1 32, the setting of T-slot 32 is easy to separate terminal slide block 9 with sliding dowel block, it may be assumed that make fuse 33 separate with terminal slide block 9.
A kind of method using above-mentioned mould, comprises the following steps:
A. the terminal of power line is inserted in fuse 33, the power line being exposed on the external is placed on line sequence location-plate 12 In draw-in groove 13;
B. slide block lock dog 7, slide block fixed plate 8 and terminal slide block 9 are put into the core cavity 1 in lower mold core fixed plate 1, with And line sequence location-plate 12 is placed in lower mold core 3;
C. mould covers, and upper mold core fixed plate 4 is locked with slide block lock dog 7, and upper mold core 6 is involutory with line sequence location-plate 12, so Rear injection;
D. after completing injection, opening upper mold core fixed plate 4, make slide block fixed plate 8 depart from slide block lock dog 7, upper mold core 6 departs from Line sequence location-plate 12;
E. the top board on mould drives thimble to make slide block lock dog 7, slide block fixed plate 8, terminal slide block 9 and line sequence location-plate 12 Departed from together with injecting products simultaneously;
F. terminal slide block 9 is fixed on fixture, then pulls slide block lock dog 7, make slide block lock dog 7 band movable slider fixed plate Fuse 33 on 8 departs from terminal slide block 9;In the present embodiment, the two side ends of terminal slide block 9 stretches out and grows slide block and fixes The two side ends of block, fixture is provided with the adaptive groove adaptive with terminal slide block 9 two side ends, and terminal slide block 9 is fastened in adaptive groove, It is set in T-slot 32 by the pulling block with T-slot 32 adaptation arranged on the main shaft of cylinder, then pulls slide block lock dog 7, make Fuse 33 in slide block lock dog 7 band movable slider fixed plate 8 departs from terminal slide block 9.
G. take out in power line draw-in groove 13 from line sequence location-plate 12, complete the demoulding.
Above-described embodiment is only presently preferred embodiments of the present invention, limits the scope of the invention the most according to this, therefore: all depend on The equivalence change that the structure of the present invention, shape, principle are done, within all should being covered by protection scope of the present invention.

Claims (8)

1. make a mould for electric source line interface, including dynamic model and cover half;It is characterized in that: described cover half includes that lower mold core is solid Determine plate, described lower mold core fixed plate is provided with core cavity one, core cavity one is provided with lower mold core;Described dynamic model includes that upper mold core is solid Determine plate, described upper mold core fixed plate is provided with core cavity two, core cavity two is provided with upper mold core;Upper mold core is involutory with lower mold core to be set Put;It is provided with in described core cavity one and core cavity one close-fitting and dismountable core rod assembly;Core rod assembly includes slide block lock dog, slide block Fixed plate and terminal slide block, slide block lock dog is fixing with slide block fixed plate to be connected, and the outer wall of slide block lock dog pastes with the inwall of core cavity one Close and arrange;Being provided with at least one die cavity on terminal slide block, die cavity is adaptive with upper and lower core rod;It is provided with some on described die cavity The individual movable fuse arranged, described fuse is fixed in described slide block fixed plate, is arranged with between described upper mold core and lower mold core Line sequence location-plate, line sequence location-plate is flexibly connected with terminal slide block;It is provided with and several fuses pair on described line sequence location-plate The draw-in groove answered.
A kind of mould making electric source line interface the most according to claim 1, it is characterised in that: in described slide block fixed plate Being provided with fuse groove one, described terminal slide block is provided with fuse groove two, described fuse is fixed on fuse groove one and passes core Pilot trench two.
A kind of mould making electric source line interface the most according to claim 1 and 2, it is characterised in that: described terminal slide block Make both position with line sequence location-plate by alignment pin and be connected.
A kind of mould making electric source line interface the most according to claim 3, it is characterised in that: several described fuses set It is set to two rows, line sequence location-plate is provided with the two rows draw-in groove being correspondingly arranged with two rows fuse, described lower mold It is provided with on core and the draw-in groove one of the lower involutory setting of row's draw-in groove, upper mold core is provided with and the draw-in groove of the upper involutory setting of row's draw-in groove Two.
A kind of mould making electric source line interface the most according to claim 3, it is characterised in that: arrange in described upper mold core There is the groove one towards die cavity, described lower mold core is provided with the groove three towards die cavity, in groove one, be provided with projection one, convex It is provided with draw-in groove two on block one, in groove three, is provided with projection two, projection two is provided with draw-in groove one, line sequence location-plate is arranged There is projection three, the upper surface of projection three is provided with the step one concaved, step one is provided through draw-in groove, projection three Lower surface on be provided with the step two concaved, step two is provided through lower bayonet slot, projection one supports with described step one Pressure, makes draw-in groove and draw-in groove two form binder passage one, and projection two compresses with described step two, makes lower bayonet slot and draw-in groove one formation Binder passage two.
6. according to a kind of mould making electric source line interface described in claim 1 or 2 or 4 or 5, it is characterised in that: described cunning The upper end of block lock dog is provided with inclined plane one, described core cavity two is provided with and the inclined plane two of inclined plane one adaptation, tilts Face one and inclined plane two form wedge hold-down mechanism.
7. according to a kind of mould making electric source line interface described in claim 1 or 2 or 4 or 5, it is characterised in that: described cunning Offer an opening on block lock dog and outwardly and run through the T-slot of inclined plane one.
8. the method for the mould used described in claim 1, it is characterised in that: comprise the following steps:
A. the terminal of power line is inserted in fuse, the power line being exposed on the external is placed in the draw-in groove on line sequence location-plate;
B. slide block lock dog, slide block fixed plate and terminal slide block are put into the core cavity one in lower mold core fixed plate, and by line sequence Location-plate is placed in lower mold core;
C. mould covers, and upper mold core fixed plate is locked with slide block lock dog, and upper mold core is involutory with line sequence location-plate, is then molded;
D. after completing injection, opening upper mold core fixed plate, make slide block fixed plate depart from slide block lock dog, upper mold core departs from line sequence location Plate;
E. the top board on mould drives thimble to make slide block lock dog, slide block fixed plate, terminal slide block and line sequence location-plate together with injection Product is departed from simultaneously;
F. terminal slide block is fixed on fixture, then pulls slide block lock dog, make the core in slide block lock dog band movable slider fixed plate Son departs from terminal slide block;
G. take out in power line draw-in groove from line sequence location-plate, complete the demoulding.
CN201610778093.XA 2016-08-31 2016-08-31 Die for manufacturing power line interface Active CN106113414B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201610778093.XA CN106113414B (en) 2016-08-31 2016-08-31 Die for manufacturing power line interface

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CN106113414B CN106113414B (en) 2023-11-21

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN107553818A (en) * 2017-10-13 2018-01-09 东莞市宜曼洲电子科技有限公司 The master mold and Quick Release injection mold of a kind of Quick Release injection mold
CN109366903A (en) * 2018-10-26 2019-02-22 合兴汽车电子股份有限公司 A kind of adapted to injection system
CN111976099A (en) * 2020-08-26 2020-11-24 深圳市神通天下科技有限公司 Bluetooth headset battery protective layer forming die

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JPH0788882A (en) * 1993-09-22 1995-04-04 Tokai Rika Co Ltd Production of insulator fitted with connector plug-in part
JP2000208232A (en) * 1999-01-11 2000-07-28 D D K Ltd Manufacture of harness and metal mold used therefor
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CN206066862U (en) * 2016-08-31 2017-04-05 玉环新华辰电器有限公司 A kind of mould for making electric source line interface

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CN107553818A (en) * 2017-10-13 2018-01-09 东莞市宜曼洲电子科技有限公司 The master mold and Quick Release injection mold of a kind of Quick Release injection mold
CN107553818B (en) * 2017-10-13 2024-05-17 东莞市宜曼洲电子科技有限公司 Female die of quick-release injection mold and quick-release injection mold
CN109366903A (en) * 2018-10-26 2019-02-22 合兴汽车电子股份有限公司 A kind of adapted to injection system
CN109366903B (en) * 2018-10-26 2023-08-15 浙江合兴电子元件有限公司 Injection molding system
CN111976099A (en) * 2020-08-26 2020-11-24 深圳市神通天下科技有限公司 Bluetooth headset battery protective layer forming die

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