CN1301618A

CN1301618A - Multipurpose injection mold with quick changeable core

Info

Publication number: CN1301618A
Application number: CN 99127249
Authority: CN
Inventors: 刘雄伟
Original assignee: Huaqiao University
Current assignee: Huaqiao University
Priority date: 1999-12-29
Filing date: 1999-12-29
Publication date: 2001-07-04

Abstract

The present invention provides a structural design of injection molding mold capable of being used in injecting different parts by means of quick replacement of mold core. On the basis of standard injection mold, the present invention has two changeable main cores, one for movable mold plate and the other for fixed mold plate, several movable son cores and several changeable side core linings. By changing movable subcores and side cores, one mold may be used in producing different plastic parts. The main core is positioned and replaced by means of wedged blocks, and the core replacement is performed in open mold state.

Description

One module multiple usages quick changeable core injection mould

The invention provides a kind of quick changeable core injection mould device that can produce different parts by the replacing core in the different time injection moulding.Can be used for producing small batch products such as PVC pipe fitting, telephone outer shell, phone housing, hand phone battery case, small household appliance shell, micro-wave oven vessel, dress accessory,

The injection mould that uses in producing now is fixed structure, and promptly a cover injection mould can only be produced changeless moulding.

When the market demand of certain product is little (product quantity that the market demand that refers to product can be produced before damaging under the normal operating position far fewer than injection mould--represent this quantity with the life-span of injection mould usually), the actual production quantity of injection mould just is forced to scrap much smaller than die life the time, causes the single product cost to increase.

When the market demand of certain product to the injection moulding production process be intermittent in (the injection moulding speed of production is very fast, the efficient height), for overstocked commodities not, the production of this product at this moment also is desultory.And aborning ,-as have multiple product will organize production, do not stop production in order to make injection machine, then injection machine needs often to change different injection moulds, reaches the purpose of producing different product.The die cost height certainly will cause a large amount of moulds to leave unused (although not scrapping) so on the one hand, owing to this means that a large amount of funds overstocks.On the other hand required time of mold exchange long (few 2 hours, many 8 hours, relevant with mould size, structure) more on injection machine, if die change is frequent, will cause injection machine and labour's effective production time short, production efficiency is low.

Although the mould that pressure is scrapped in producing, the certain recycling that has that has is worth (not being meant raw-material recovery), but owing to do not consider the recycling problem in design well, again dismounting (comprises repair, changes some parts, good core etc.) number of times seldom, generally be no more than 2 times, and every dismounting once, the precision of mould reduces greatly.

International online retrieval is found one piece of document, 13 patents.Wherein there are 8 patents and the present invention uncorrelated fully, " Changing cavities while the mould is installed " (EIP 98024055931) document is introduced a kind of rotary-type injection mould, change die cavity and core fast by manual index dial transposition, need not mould unloading, this Mould design purpose, structure are different with the present invention.WPI Acc No:93-070501/199309 patent of invention is introduced a kind of injection mould core of being made up of core stocking mechanism, core replacing operator, steam-operating device and is changed device, adopts the steam-operating device, has increased die cost greatly.WPI Acc No:89-361079/198949 patent of invention is introduced a kind of injection mould of changing core, and its core clamping device is a hydraulic means, and mechanism of the present invention is simple, need not hydraulic means.WPI AccNo:85-181467/198530 patent of invention is introduced the changeable core injection mould device that a kind of core partly is made up of core body and core moulding, core body and template are by flange location and clamping, owing to require matched in clearance between flange and the template, positioning accuracy is lower than the present invention, and manufacturing cost is than the present invention height.

The invention provides a kind of structural design that can produce the quick changeable core injection mould of different injection-moulded plastic parts at different time by the replacing core, promptly the some movable subtype cores 9 of design on main core 4 are realized a multi-cavity mold, reach the purpose of one module multiple usages.Main core of the present invention clamps by tapered wedges 2, with the two sided location of the cavity on main core and the mold cavity plate 1, improves positioning accuracy, reduces manufacturing cost simultaneously.

The invention provides a kind of by changing the structural design that core can be produced the quick changeable core injection mould of different parts in the different time injection moulding.Its core concept is on the basis of standard injection mould, respectively designs an equal-sized cavity on the mold cavity plate 1 of dynamic model and cover half, and respectively designs an interchangeable main core 4 on these two cavitys.Main core 4 is assembled into movingly with the mold cavity plate cavity, and the gap is between 0.02mm～0.1mm.Two adjacent side of main core 4 are locating surface, contact the location with 8 with two inboard datum levels 7 of mold cavity plate cavity.Main core is compressed by tapered wedges 2, by clamping screw 3 lockings.Owing to have self-locking, adopt screw 6 to eject tapered wedges when unclamping.The some movable subtype cores 9 of design on main core 4, realize a multi-cavity mold, movable subtype core 9 is that the back side (with respect to die joint) from main core 4 is installed on the main core 4, after main core 4 removes from mold cavity plate 1, taking-up activity subtype core 9, and, reach the purpose of producing different injection-moulded plastic parts by changing the movable subtype core 9 of difformity and size.

This mould structure is changed with side core 12 by the method for the interchangeable side core lining 14 of design on main core 4 or mold cavity plate 1, realizes the requirement of different injection-moulded plastic parts to side core 12.Side core lining 14 adopts a press strip 15 to realize circumferentially location and clamping, and its axial location is realized by the axial location ring on the lining 14.

The replacing of core (the shaping parts that refer to injection mould) is being carried out on the injection machine: promptly change core under shutdown, die opening state by hand, the simple, convenient and speed of changing core is fast.

Because one module multiple usages, die cost reduces greatly, and the fund that causes is overstocked to significantly reduce because mould overstocks.

Because the replacing speed of core is fast, injection machine is short downtime, the production efficiency height.

Because reasonable in design, the replacing of core each time promptly can not influence the precision and the life-span of mould because of changing core to the not influence of precision of mould.The life-span of mould is by the output decision of mould.

The invention provides 3 structural design drawings

Fig. 1--the assembly relation and the fast replacing device figure of main core location, subtype core and main core;

Fig. 2--side core fast replacing device figure;

Fig. 3--side core lining fast replacing device figure.Fig. 1:

1, mold cavity plate 2, tapered wedges 3, clamping screw 4, main core

5, die cavity fixed block 6, eject the forward locating surface of screw 7, main core and mold cavity plate

8, the lateral register face 9 of main core and mold cavity plate, subtype core Fig. 2:

10, side core fixed head 11, side core buck plate 12, side core Fig. 3:

10, side core fixed head 11, side core buck plate 12, side core

13, main core or template 14, side core lining

15, the circumferential location of side core lining and fixedly briquetting

To the production of small batch injection-moulded plastic part, the injection mould that adopts the present invention to manufacture and design can reach fast Speed is changed the effect of core one module multiple usages. Elbow series of products in the PVC pipe fitting for example, its diameter Totally 12 kinds from 20mm to 200mm adopt the present invention to design injection mould, according to the size of product Distribution design three cover quick changeable core injection moulds can satisfy the production requirement of elbow series of products, can save 9 cover mould bases. Adopting the present invention to design injection mould can carry out by hand, also can adopt CAD (CAD) method. The present invention advocates the employing CAD, can improve design efficiency, avoids in the design Contingent mistake.

Claims

(1) a kind of changeable core of being made up of mold cavity plate 1, main core 4, movable subtype core 9 and side core 12 is annotated

The mold device.It is characterized in that: on the basis of standard injection mould, in the mold cavity plate of dynamic model and cover half

Respectively design an equal-sized rectangle cavity on 1, and in these two cavitys, respectively design one interchangeable

Main core 4.
(2) according to the described mould structure of claim (1).It is characterized in that: on main core 4 and the mold cavity plate 1

Being assembled into movingly of rectangle cavity, fit clearance is between 0.02～0.1mm.
(3) according to the described mould structure of claim (1).It is characterized in that: two adjacent side of main core 4

Be locating surface, contact the location with 8 with two inboard datum levels 7 of rectangle cavity on the mold cavity plate 1,

Main core 4 is compressed by tapered wedges 2, by clamping screw 3 lockings, when changing core, by ejecting screw

6 eject tapered wedges.
(4) according to the described mould structure of claim (1).It is characterized in that: the some work of design on main core 4

Mover core 9 is realized a multi-cavity mold.
(5) according to claim (1) and (4) described mould structure.It is characterized in that: movable subtype core 9 is from the master

The back side of core 4 is installed on the main core 4, and when changing core, main core and subtype core are together more

Change.
(6) according to the described mould structure of claim (1).It is characterized in that: on main core 4 or mold cavity plate 1

Design interchangeable side core lining 14, change, realize different injection-moulded plastic parts with side core 12

Requirement to side core 12.
(7) according to claim (1) and (6) described mould structure.It is characterized in that: side core lining 14 adopts

A press strip 15 is realized circumferentially location and clamping, and its axial location is by the axial location ring on the lining 14

Realize.