CN105346012A - Thin-wall injection molding mold with continuously-variable cavity size - Google Patents

Abstract

The invention provides a thin-wall injection molding mold with continuously variable cavity size, which belongs to the field of injection mold design and manufacture. Including fixed template, movable template, movable mold insert, cavity slide plate, T-shaped slide block, guide chute, feed screw. There is a T-shaped slider on both sides of the movable mold insert. The T-shaped slider slides along the guide chute, and then drives the sliding plate of the cavity connected to it to move, realizing the continuous variable length of the cavity, which is controlled by the feed screw. Feed of the T-slide. Plastic parts are pushed out by push rods, and the number of push rods that actually participate in the plastic part push changes constantly with the movement of the cavity slide. A plurality of sets of rectangular through-holes are preset on the cavity slide plate, so that the push rods not participating in the ejection of plastic parts can be pushed out normally, preventing them from interfering with the cavity slide plate. Using this mold can continuously adjust the cavity size online, and a series of products of different sizes can be produced with the same mold. It avoids the cumbersome operation and high cost of dismantling the mold to replace the movable mold insert in the traditional way.

Description

A thin-wall injection molding mold with continuously variable cavity size

technical field

The invention belongs to the field of design and manufacture of injection molds, and relates to a thin-wall injection molding mold with continuously variable cavity size.

Background technique

Thin-walled plastic parts are widely used in electronic appliances, home appliances, automobiles, aerospace and military products due to their advantages of material saving, volume reduction and cost reduction. Injection molding has become the most suitable technical method for mass production of thin-walled plastic parts due to its low cost and high efficiency, and the serial production of products has put forward new requirements for mold design and manufacturing technology.

Taking typical thin-walled plastic parts such as microfluidic chips and light guide plates as examples, in order to meet market needs, it is necessary to design and produce a series of products with different specifications and sizes, and a corresponding series of molds are needed to deal with it. The difference is that it is obviously not worth the candle to make a new mold. In the past, it was possible to change the size of the cavity by replacing the cavity insert, but each time the cavity insert needs to be disassembled and assembled, the operation is complicated and time-consuming. In addition, this method adjusts the size of the cavity discontinuously, and the more size points are adjusted, the more cavity inserts are required, which increases the cost of the mold accordingly. Therefore, there is an urgent need for a thin-walled injection mold that can realize continuously variable cavity size without disassembling the mold to replace inserts.

Contents of the invention

The invention provides a thin-wall injection molding mold with continuously variable cavity size, which is mainly used for forming series products of the same kind of thin-wall plastic parts with different sizes. Using this mold can continuously adjust the cavity size online, and a series of products of different sizes can be produced with the same mold.

Technical scheme of the present invention is as follows:

A thin-walled injection molding mold with continuously variable cavity size, comprising a fixed template, a movable template, a movable mold insert, a cavity slide plate, a T-shaped slider, a guide chute and a feed screw, a movable mold insert, a mold The cavity slide plate and the fixed template form a variable cavity;

One end of the cavity slide plate is fixed on the T-shaped slider by a hexagon socket head cap screw, and the two sides of the other end are matched with the side wall of the through groove of the movable mold insert, and the gap is smaller than the overflow value of the polymer material; the two sides of the movable mold insert There is a T-shaped slider on each side, and the T-shaped slider slides along the matching guide chute, driving the cavity slide plate connected with the T-shaped slider to move, realizing the continuous variable length of the variable cavity; T-shaped There are threaded holes on the slider, and the feed screw is used to control the feed of the T-shaped slider; when the T-shaped slider drives the cavity slide to the specified position, the T-shaped slider and the movable mold insert are fixed by locking screws , to ensure that the cavity slide plate is fixed under the injection pressure; plastic parts are pushed out by push rods, and as the cavity slide plate moves, the number of push rods is determined according to the size of the plastic part; the push rod push position on the cavity slide plate is preset to set Multiple sets of rectangular through holes allow the push rods not involved in the plastic parts to be pushed out normally, preventing them from interfering with the cavity slide plate.

The effects and benefits of the invention are: the designed thin-wall injection molding mold with continuously variable cavity size has simple structure, reliable operation and strong versatility, and is suitable for forming plastic parts of thin-wall series sizes. Using the T-shaped slider to drive the cavity slide plate to move to realize the continuous variable cavity size avoids the cumbersome operation and high cost of dismantling the mold to replace the movable mold insert in the traditional way. Multiple sets of rectangular through-holes are preset at the push rod push position on the cavity slide plate to facilitate the normal push of the push rod that does not participate in the plastic part push, effectively prevent it from interfering with the cavity slide plate, and realize online adjustment. The invention provides a simple and reliable new scheme for realizing continuous variable mold cavity, and the application of the mold can effectively improve product quality, reduce production cost and improve production efficiency.

Description of drawings

Figure 1 is a schematic diagram of the assembly of a thin-walled injection molding mold with continuously variable cavity size.

Fig. 2 is a partial enlarged view of the top view of the cavity size adjustment part.

Fig. 3 is a partial enlarged view of the front view of the cavity size adjustment part.

In the figure: 1 fixed template; 2 movable mold insert; 3 push rod; 4 movable template; 5T slider; 6 feed screw; 7 cavity slide plate; 8 hexagon socket screw; 9 locking screw; .

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 to Fig. 3 are a specific implementation case of the patent of the present invention.

As shown in Figure 1, the variable cavity of the mold is surrounded by the fixed template 1, the movable mold insert 2 and the cavity slide plate 7. The width of the variable cavity is 60 mm, the depth is 1 mm, and the length of the variable cavity can be adjusted. As shown in Figure 2 and Figure 3, one end of the cavity slide plate 7 is fixed on the T-shaped slider 5 through the hexagon socket head cap screw 8, and the two sides of the other end are matched with the side wall clearance of the movable mold insert 2 through groove, and the clearance is less than The overflow value of the polymer material. There is a T-shaped slide block 5 on both sides of the movable mold insert 2, which respectively drives a cavity slide plate 7 to move along the guide chute 10, so as to realize the continuous change in the length direction of the variable cavity size.

The specific change process of the variable cavity size is as follows: As shown in Figure 2 and Figure 3, the cavity slide plate 7 is fixed at the minimum limit position, and the variable cavity length is the minimum value of 40mm at this time. When it is necessary to change the length of the variable cavity, first loosen the locking screw 9, and then rotate the feed screw 6 to make the T-shaped slider 5 move to the outside of the variable cavity, and then drive the cavity slide plate 7 connected to it to move, so that it can The length of the variable cavity is increased; when the T-shaped slider 5 drives the cavity sliding plate 7 to move to the specified position, tighten the locking screw 9 to fix the position of the T-shaped slider 5 and the cavity sliding plate 7 to prevent injection pressure. The cavity slide plate 7 moves laterally. The screw-in amount of the feed screw 6 is equal to the movement amount of the cavity slide plate 7, and the maximum movement amount of the cavity slide plate 7 on both sides is 40 mm. When the two move to the maximum limit, the variable cavity size reaches a maximum of 120 mm.

The plastic part is pushed out with a push rod. As shown in FIG. 2 , the number of push rods 3 actually involved in pushing out the plastic part varies with the position of the cavity slide 7 . As shown in FIG. 2 , multiple sets of rectangular through holes are preset on the movable cavity slide plate 7 , and the positions and sizes of the multiple sets of rectangular through holes are calculated according to the diameter and distribution of the push rod 3 . Multiple groups of rectangular through holes effectively prevent the interference between the push rod 3 that does not participate in the ejection of the plastic part and the movable cavity slide plate 7 .

Claims (2)

1. A thin-wall injection molding mold with continuously variable cavity size is characterized in that, the thin-wall injection molding mold with continuously variable cavity size comprises a fixed template, a movable template, a movable mold insert, a cavity Sliding plate, T-shaped slider, guide chute and feed screw, movable mold insert, cavity sliding plate and fixed template form a variable cavity; One end of the cavity slide plate is fixed on the T-shaped slider by a hexagon socket head cap screw, and the two sides of the other end are matched with the side wall of the through groove of the movable mold insert, and the gap is smaller than the overflow value of the polymer material; the two sides of the movable mold insert There is a T-shaped slider on each side, and the T-shaped slider slides along the matching guide chute, driving the cavity slide plate connected with the T-shaped slider to move, realizing the continuous variable length of the variable cavity; T-shaped There are threaded holes on the slider, and the feed screw is used to control the feed of the T-shaped slider; when the T-shaped slider drives the cavity slide to the specified position, the T-shaped slider and the movable mold insert are fixed by locking screws , to ensure that the cavity slide plate is fixed under the injection pressure; plastic parts are pushed out by push rods, and as the cavity slide plate moves, the number of push rods is determined according to the size of the plastic parts. 2. The thin-walled injection molding mold with continuously variable cavity size according to claim 1, characterized in that a plurality of sets of rectangular through holes are preset at the pushing position of the push rod on the cavity slide plate, so that the plastic parts not involved in the pushing out The putter is pushed out normally.