CN109551718B

CN109551718B - Cubic structure of loosing core of mould

Info

Publication number: CN109551718B
Application number: CN201811298231.XA
Authority: CN
Inventors: 徐生; 肖国华
Original assignee: Zhejiang Business Technology Institute
Current assignee: Linyi Industry Research Institute Co.,Ltd.
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2021-03-09
Anticipated expiration: 2038-11-02
Also published as: CN109551718A

Abstract

The invention provides a three-time core-pulling mechanism for a mold, which comprises a sliding block, wherein the sliding block is connected with an inclined guide post, the inclined guide post is connected with a first spring, the first spring is connected with a first side-shaped needle, the first side-shaped needle is connected with a second side-shaped needle, and the second side-shaped needle is connected with a second spring. Demolding is carried out on the inner wall and outer wall inverted buckle characteristics of the plastic part in three times in the mechanism, the demolding is carried out on the whole side face of the outer wall for the first time, the molding of the sliding block is carried out, and the molded part with the secondary core pulling supports against the outer side wall to prevent the molded part from deforming; the second time is demoulding with local back-off characteristics, and the secondary forming needle is drawn out from the outer wall under the driving of the sliding block; and thirdly, reversely buckling the inner wall, and pushing the side wall of the plastic part out of the mold core by using an elastic core mechanism.

Description

Cubic structure of loosing core of mould

Technical Field

The invention relates to a core pulling mechanism, in particular to a three-time core pulling structure of a mold.

Background

Because the operating environment of the numerical control machine tool controller is relatively harsh, the electronic components need to be specially packaged to protect the components from being damaged. Sheet metal parts are generally adopted for packaging of packaging components with certain structures, and plastic shells are generally adopted for packaging of packages with low structural strength requirements. The plastic part packaging part can be assembled by adopting a single plastic shell or a plurality of plastic parts, and during injection molding, the plastic part also needs to ensure certain molding precision, which is generally controlled at the precision grade of MT 4. For the combined part, according to the size of the product, in order to save the manufacturing cost of the mold, a plurality of different plastic parts are generally molded in the same mold by adopting a mold with multiple cavities, and when the same mold is adopted for injection molding, the sizes of the different plastic parts are selected to be closer, otherwise, the difficulty of the design of a mold pouring system is increased. When the plastic is injected in the same mold, the cooling systems of different plastic parts are required to be effectively designed so as to prevent the plastic parts from being cooled unevenly and the molding quality of the plastic parts from being deteriorated. In addition, the layout of the mold releasing mechanism and the layout of other machine components are also considered, so as to avoid the increase of the mold manufacturing cost caused by the design space conflict generated by the mechanism components.

The production requirements of injection molding of two similar plastic parts in the same-mold family mold are combined, on the basis of fully analyzing the structural characteristics of the plastic parts, the two-plate mold cold runner and one-mold two-cavity family mold of the plastic parts is designed, the cold runner multi-stage runner submarine gate is adopted for balanced pouring, and the requirements of back-off demolding are required on the inner surface and the outer surface of a single side wall of the plastic part.

Disclosure of Invention

The invention relates to a three-time core-pulling structure of a mold, which realizes demolding of the inner and outer wall back-off characteristics of a plastic part through an improved inclined guide pillar and slide block mechanism.

Aiming at the existing problems, the invention provides a three-time core pulling structure of a mold, which comprises a sliding block, wherein the sliding block is connected with an inclined guide pillar, the inclined guide pillar is connected with a first spring, the first spring is connected with a first side type needle, the first side type needle is connected with a second side type needle, and the second side type needle is connected with a second spring.

The scheme is further that the first spring is connected with a first headless screw.

The scheme is further that the second spring is connected with a second headless screw.

The scheme is further that the second spring is provided with a spring sleeve.

The scheme is further that a sliding block pressing plate is arranged on the sliding block.

Above-mentioned scheme is further, the slider lower extreme is provided with slider limit screw.

The invention provides a three-time core pulling structure of a mold, and an improved inclined guide pillar and slide block mechanism is designed to realize demolding of the inner wall and the outer wall of a plastic part in a reverse buckling mode. Demolding is carried out on the inner wall and outer wall inverted buckle characteristics of the plastic part in three times in the mechanism, the demolding is carried out on the whole side face of the outer wall for the first time, the molding of the sliding block is carried out, and the molded part with the secondary core pulling supports against the outer side wall to prevent the molded part from deforming; the second time is demoulding with local back-off characteristics, and the secondary forming needle is drawn out from the outer wall under the driving of the sliding block; and thirdly, reversely buckling the inner wall, and pushing the side wall of the plastic part out of the mold core by using an elastic core mechanism.

Drawings

Fig. 1 is a schematic view of a three-time core pulling structure of a mold.

Fig. 2 is a schematic view of a slider of a three-time core pulling structure of a mold connected with a second spring.

Fig. 3 is a schematic view of product a.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in fig. 1 to 3, a tertiary core pulling structure of a mold comprises a panel 12, the panel 12 is connected with a fixed mold plate 13, one side of the fixed mold plate 13 is connected with an inclined guide post 1, the inclined guide post 1 is connected with a slide block 2, the slide block 2 is connected with a slide block pressing plate 10, so as to play a role of protection, the other side of the panel 12 is connected with a first cavity core insert 14, the first cavity core insert 14 is connected with a second cavity core insert 15, the second cavity core insert 15 is connected with a guide post 16, and a guide sleeve 17 is connected below the guide post 16, so as to play a role of protection. A slider wear-resistant bottom plate 18 is arranged below the slider 2, a slider limiting screw 11 is in threaded connection with the slider wear-resistant bottom plate 18, a first side type needle 5 and a second side type needle 4 are arranged below the slider wear-resistant bottom plate 18, the first side type needle 5 and the second side type needle 4 are connected with a first spring 6 and a second spring 3, the first side type needle 5 and the second side type needle 4 are symmetrical to each other, the slider 2 is connected with the second spring 3, when the slider 2 moves, the second spring 3 can be driven to move, the first spring 6 is sleeved with a spring sleeve 9, the first spring 6 and the second spring 3 are connected with a first headless screw 7 and a second headless screw 8, and an elastic insert 19 is arranged around the spring sleeve 9. The slide block glass bead 20 is arranged below the slide block wear-resistant bottom plate 18, and the movable mold base plate 21 is arranged below the slide block glass bead 20, so that the protection effect is achieved.

The structure diagrams of an upper packaging cover and a lower packaging cover of a packaging box of a machine tool controller are shown in figure 1, a plastic part A product is made of modified engineering plastic ABS, the shape of the plastic part A in the product A is wide at one end and small in the middle, the other end of the plastic part A is in a single-side-wall shape, the average wall thickness of the plastic part A is 2mm, and the plastic part A has three positions influencing the design of a mold, wherein one position of the plastic part A is an inner wall reverse buckle formed by a side-wall boss shown at a T1 position, the other position of the plastic part A is an outer side hole shown at a T2 position, and the third position of the plastic part.

For the characteristics of T1-T3 of the side walls of the upper end and the lower end of a product A, in view of the characteristics of two sides of the side walls, the product A is positioned between a first side needle 5 and a second side needle 4, the side core-pulling demoulding of the characteristics of 3 adopts an improved inclined guide post and slider mechanism to perform core-pulling demoulding, after the mould is opened on a P1 mould opening surface, an inclined guide post 1 drives a slider 2 to be drawn outwards to perform core-pulling demoulding on the side surface of the characteristics of T3, at the moment, the slider 2 pulls a second spring to move 3, the second side needle 4 is pushed against the side wall of a plastic part to be fixed under the elastic pressure of the second spring 3, and the slider 2 completes demoulding of the characteristics of T3; after the sliding block 2 is drawn out for a certain distance, the second side needle 4 is drawn out, and demoulding with the T2 characteristic is completed; with the absence of the second side pin 5, the first spring 6 drives the first side pin 5 outward to eject the T1 boss from the core insert, while the sidewall is slightly elastically deformed and the T1 boss does not catch on the core insert, thereby providing for the next full ejection.

The working principle of the die is carried out according to the following steps:

injection molding: and a nozzle of the mold closing injection molding machine performs injection molding on the mold cavity through the positioning ring, the three-stage runner and the sprue.

Secondly, opening the mold: after injection molding is finished, cooling the plastic part by cooling water of an injection molding machine, retreating a movable die of the die, opening the die at a P1 die opening surface of the die, and completing core-pulling and demolding of the outer wall by the slide block 2 under the driving of the inclined guide pillar 1 to realize demolding with the characteristics of T1-T3; the plastic part is left in the first cavity core insert 14 and the second cavity core insert 15.

And thirdly, completely ejecting and demoulding: the ejector rod of the injection molding machine acts to drive the ejector plate thimble cover plate and the ejector plate push plate to be ejected upwards, so that the ejector pin and the ejector rod are driven to be ejected upwards synchronously, and synchronous demolding of the plastic part and the cold runner waste is realized.

Closing: when the mold is closed, the action process of the mechanism is opposite to the mold opening process, and after the mold is closed, the next injection molding cycle is waited.

Claims

1. The three-time core pulling structure of the mold is characterized by comprising an inclined guide post (1), wherein the inclined guide post (1) is connected with a sliding block (2), the inclined guide post (1) is arranged in the sliding block (2), the lower end of the sliding block (2) is connected with a second spring (3), one side of the second spring (3) is connected with a second side wall needle (4), the second side wall needle (4) is symmetrically provided with a first side wall needle (5), the side surface of the first side wall needle (5) is connected with a first spring (6), when the mold is opened on a P1 mold opening surface, the inclined guide post drives the sliding block to be drawn outwards, core pulling and demolding are carried out on the side surface of a T3 characteristic, at the moment, the sliding block pulls the second spring to move, the second side wall needle is pushed against a plastic part to be immobile under the elastic pressure of the second spring, and the sliding block completes demolding of the T3; after the sliding block is drawn out for a certain distance, the second side-shaped needle is drawn out, and demoulding of the T2 characteristic is completed; upon loss of the second side pin lift, the first spring drives the first side pin outward to eject the T1 boss from the core insert, while the sidewall is slightly elastically deformed and the T1 boss does not catch on the core insert, thereby providing for the next full ejection.

2. The tertiary core pulling structure of the mold according to claim 1, wherein the first spring (6) is connected with a first headless screw (7).

3. The tertiary core pulling structure of the mold according to claim 1, wherein the second spring (3) is connected with a second headless screw (8).

4. The tertiary core pulling structure of the mold according to claim 1, wherein the first spring (6) is provided with a spring sleeve (9).

5. The tertiary core pulling structure of the mold according to claim 1, wherein a slider pressing plate (10) is provided on the slider (2).

6. The three-time core pulling structure of the mold according to claim 1, wherein a slider limiting screw (11) is arranged at the lower end of the slider (2).