CN201333785Y

CN201333785Y - Plastic mold

Info

Publication number: CN201333785Y
Application number: CN 200820235500
Authority: CN
Inventors: 吕根兴
Original assignee: SHENZHEN DINGSHENGDA MOLD DEVELOPMENT Co Ltd
Current assignee: SHENZHEN DINGSHENGDA MOLD DEVELOPMENT Co Ltd
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2009-10-28
Anticipated expiration: 2018-12-19

Abstract

The utility model discloses a plastic mold, which comprises a front auxiliary plate and a rear auxiliary plate, wherein the front auxiliary plate and the rear auxiliary plate are combined together to form a sub-runner and a gate which are communicated with each other; the gate is curved like a banana; the section of one end of the gate connected with the sub-runner is larger; the section of the other end of the gate is smaller; and the small-section end of the sub-runner is connected with a mold cavity. The gate structure of the mold provided by the utility model has the advantages of a direct gate, a pinpoint gate and a tunnel gate, moreover, when being demoulded, a product can be better automatically separated from gate scraps, and thereby the processed product has high precision and good appearance.

Description

A kind of plastic mould

Technical field

The utility model relates to a kind of plastic mould field, relates in particular to a kind of improvement to the plastic mould cast gate.

Background technology

Cast gate in the plastic mould injection moulding is the coupling part of runner and die cavity, also is the decline of injection mold feed system, and its basic role is: the molten plastic that comes from runner is entered with the fastest speed be full of die cavity; After die cavity was full of, cast gate can cool off sealing rapidly, prevented that also uncooled plastics reflux in the die cavity.

Cast gate in the plastic mould injection moulding at present adopts forms such as down gate, some cast gate and latent cast gate more.

The plastic cement melt is directly entered the die cavity of product mold during the down gate injection moulding by sprue, need not pass through runner, it exists heat and the little advantage of the pressure loss, but it is the same with the some cast gate, all the existence meeting stays gate vestiges on product, influences shortcomings such as product is attractive in appearance.

Dive the pouring gate structure schematic diagram as shown in Figure 1, comprise runner 101 and cast gate 102, generally suit to adopt when into Jiao Chu has the suitable position of bone or post position at product surface, or in order not leave vestige and to be provided with at product die joint place, but when product surface suits into that Jiao Chu does not have the suitable position of bone or post position, and product surface can not leave into the glue vestige and cast gate just should not adopt latent cast gate can not reach the product inner surface time.

Therefore, the various cast gates of the extensive employing of mould applications all have its shortcoming at present, can not satisfy the manufacturing requirement of accurate plastic mould part.

The utility model content

The utility model provides the new type plastic mould gate device of the less precision component of a kind of suitable manufacturing dimension.

The utility model is realized the plastic mould of above-mentioned purpose, comprise front assistant board and back assistant board, the two amalgamation forms runner and cast gate, wherein, described runner and cast gate are interconnected, and described cast gate bending is the banana shape, and its end section that is connected with runner is bigger, other end cross section is less, and the less end in described runner cross section is connected with mold cavity.

The less end in described cast gate cross section is connected with described mold cavity by the tubular part that is made of cylinder and taper type, the less end in a wherein end of described cylinder and described cast gate cross section is connected, its other end is connected with the roundlet face end of described taper type, and the big disc end of described taper type is connected with described mold cavity.

The diameter of section of the end that described cast gate cross section is less is greater than the cylindrical cross-section diameter of described tubular part, and the less end in described cast gate cross section is connected with the cylindrical cross-section end arc of described tubular part.

The taper type great circle diameter of section of described tubular part is greater than the diameter of section of described cylinder, and the roundlet diameter of section of described taper type equals the diameter of section of described cylinder.

The taper type great circle diameter of section of described tubular part is less than or equal to the diameter of section of the less end in described cast gate cross section.

Because cast gate one end section of the utility model plastic mould is bigger, other end cross section is less, and the less end in cross section is connected with mold cavity by a tubular part that is made of cylinder and taper type, this structure has possessed the advantage of down gate, some cast gate and latent cast gate simultaneously, and can better separate automatically with the cast gate waste material during product stripping, the precision that has guaranteed the part product processed accurately and appearance looks elegant complete.

Description of drawings

Fig. 1 slips into water pouring gate structure schematic diagram for plastic mould in the prior art;

Fig. 2 is the pouring gate structure schematic diagram of the plastic mould of the utility model embodiment;

Fig. 3 is the local enlarged diagram of A portion among the utility model Fig. 2;

Perspective view when Fig. 4 is the plastic mould matched moulds of the utility model embodiment.

The specific embodiment

Below in conjunction with accompanying drawing, will be described in detail preferred embodiment of the present utility model.

Plastic rubber mold structure in the utility model comprises front assistant board 401 and back assistant board 402 as shown in Figure 4, after front assistant board and back assistant board amalgamation are good, forms runner 201 and cast gate 202, and runner and cast gate are interconnected.Cast gate 202 is the banana shape, so that can extend into the inner surface of product in the die cavity 203 during injection moulding, the end section size that cast gate links to each other with runner is bigger, and the end section size that cast gate links to each other with the product inner surface is less.The less end of cast gate sectional dimension can directly link to each other with mold cavity 203, also can link to each other by a tubular part.

Described tubular part structure enlarged drawing as shown in Figure 3, magnification ratio is 2: 1, this tubular part is connected with the tubular part that taper type 301 is interconnected to constitute by cylinder 302.The diameter of section of the end that the cast gate cross section is less is greater than the cylindrical end diameter of section of attaching parts.The taper type 301 great circle diameter of sections of attaching parts are greater than the diameter of section of cylindrical end, and taper type 301 roundlet diameter of sections equal the diameter of section of described cylindrical end.The cylinder 302 wherein less end arc in an end and described cast gate cross section links to each other, and taper type 301 big disc ends link to each other with mold cavity, and taper type roundlet face end links to each other with the described cylinder other end.

During injection moulding, the plastic cement melt passes through the bigger end in cross section that runner flows to cast gate from sprue, and a less end flows out by tubular connecting element from the cross section of cast gate 202 again, enters the mold cavity 203 of plastic cement products then.Because an end section of the cast gate of this plastic mould is bigger, it is big to have possessed the down gate size, and the advantage that the heat and the pressure loss are little is beneficial to the product injection moulding.

Behind the plastic cement products cooling forming during die sinking, thimble under the plastic cement products promotes product and moves in the opposite direction to die sinking side, because an end section size that is connected with runner 201 of cast gate is bigger, the cast gate waste material of this end can along with sprue puller to moving in the opposite direction and move with die sinking side, can not disconnect with the cast gate waste material in the runner, and cast gate is less with an end size that is connected of shaped article, this end cast gate waste material very easily disconnects with plastic cement products, and the plastic cement products behind the cooling forming can separate automatically with the cast gate waste material.

Especially when gate size than small end by by cylindrical 302 tubular parts that constitute with taper platform 301 when product inner surface in the mold cavity is connected, because the cylindrical end sectional dimension that is connected with cast gate is less than the size of cast gate cross section than small end, this syndeton is separated with the cast gate waste material automatically than directly being connected the easier product that makes with the product inner surface by the banana cast gate.And the taper type end section size of this tubular part more helps the injection moulding melt and injects the product die cavity greater than columniform sectional dimension.

In sum, because cast gate one end section of the utility model plastic mould is bigger, other end cross section is less, and the less end in cross section is connected with mold cavity by a tubular part that is made of cylinder and taper type, this structure has possessed the advantage of down gate, some cast gate and latent cast gate simultaneously, and can better separate automatically with the cast gate waste material during product stripping, the precision that has guaranteed the part product processed accurately and appearance looks elegant complete.

Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model claims.

Claims

1, a kind of plastic mould, comprise front assistant board and back assistant board, the two amalgamation forms runner and cast gate, it is characterized in that: described runner and cast gate are interconnected, described cast gate bending is the banana shape, its end section that is connected with runner is bigger, and other end cross section is less, and the less end in described cast gate cross section is connected with mold cavity.

2, plastic mould as claimed in claim 1, it is characterized in that, the less end in described cast gate cross section is connected with described mold cavity by the tubular part that is made of cylinder and taper type, the less end in a wherein end of described cylinder and described cast gate cross section is connected, the other end of described cylinder is connected with the roundlet face end of described taper type, and the big disc end of described taper type is connected with described mold cavity.

3, plastic mould as claimed in claim 2, it is characterized in that, the diameter of section of the end that described cast gate cross section is less is greater than the cylindrical cross-section diameter of described tubular part, and the less end in described cast gate cross section is connected with the cylindrical cross-section end arc of described tubular part.

As claim 2 or 3 described plastic moulds, it is characterized in that 4, the taper type great circle diameter of section of described tubular part is greater than the diameter of section of described cylinder, the roundlet diameter of section of described taper type equals the diameter of section of described cylinder.

5, plastic mould as claimed in claim 4 is characterized in that, the great circle diameter of section of the taper type of described tubular part is less than or equal to the diameter of section of the less end in cross section of described cast gate.