CN103640189A - Mold for demolding plastic products by virtue of dovetail groove and spring mechanism - Google Patents

Abstract

The invention discloses a mold for demolding plastic products by virtue of a dovetail groove and a spring mechanism, and belongs to the field of thermoplastic forming molds. The mold is characterized in that a mold base comprises fixed and movable mold seat plates, a runner push plate, fixed and movable templates and square iron; an inner structure comprises a fixed mold insert, a dovetail groove insert, a dovetail stand insert, a guide block, bolts A and B with shoulders and springs A and B. The dovetail groove insert and the dovetail stand insert are in surface fit and are connected through dovetail to achieve the limiting and guiding effects; the dovetail stand insert and the fixed mold insert are in table hanging connection; the guide block and a guide block fixing block are in surface fit; during mold opening, the dovetail groove insert slides along the dovetail direction, the dovetail stand insert transversely slides under the tension action of the spring B, and the back-off part of the plastic product is demolded; during mold closing, the dovetail groove insert slides along the dovetail direction, the dovetail stand insert is pushed to transversely slide and reset. The back-off part of the plastic product is demolded by virtue of the dovetail groove and the spring mechanism, the structure of the mold is simplified, the space of the mold is saved, and the production efficiency is improved.

Description

A mold that ejects plastic products by dovetail groove and spring mechanism

technical field

The invention belongs to the field of molding molds for thermoplastics, and relates to a mold for ejecting plastic products by a dovetail groove and a spring mechanism, and is mainly used in molds with undercuts in complex shapes of plastic products.

Background technique

At present, for some plastic products with appearance shells, plastic products such as nameplates or buttons need to be installed to form a whole when the product is assembled. There are higher requirements for the gap required for installation and cooperation, so there are undercut parts in the holes or grooves where other plastic parts need to be installed in shell plastic products.

At present, molds with undercuts in complex shapes are realized by the tunnel-type fixed mold inner pumping slider. Using the tunnel-type fixed mold inner-drawing slider to form the undercut part, tunnel-type blind holes need to be processed in the insert The body of the slider is placed, and the inclined guide pillars or hook legs of the guide slider are set on the template other than the insert. This kind of mold structure takes up a lot of space, is difficult to process, cumbersome to assemble, and there will be problems such as burrs and difficult adjustments. Mold cost, high requirements on the size of the mold and high requirements on the molding tonnage and clamping force.

Contents of the invention

The technical problem to be solved by the present invention is to provide a mold for ejecting plastic products by means of dovetail grooves and spring mechanisms, so as to solve the problem of undercuts in complex shapes of plastic products, so that the products can be demoulded smoothly and meet the technical requirements.

The technical solution of the present invention is that the mold frame of this mold includes: fixed mold seat plate 1, runner push plate 2, fixed mold plate 3, movable mold plate 4, square iron 5, face needle plate 6, bottom needle plate 7 and movable mold Seat plate 8, internal structure includes: fixed mold insert 9, dovetail groove insert 10, dovetail table insert 11, guide block 12, shoulder bolt A13, shoulder bolt B14, movable mold insert 15, spring A16, spring B17, guide block fixed block 18, limit sleeve 19, jacking screw 20, fixed mold insert 21, push rod 22.

The internal connection method is: the dovetail groove insert 10 is a square insert and is provided with a dovetail groove, an inclined plane, two parallel straight surfaces and a square boss, wherein the dovetail groove and the dovetail platform insert 11 are surface fits and are limited by the dovetail connection. Positioning and guiding function, the inclined surface cooperates with the fixed mold insert 9 as a surface, which plays the role of limiting wedge tightness, and the two parallel straight surfaces contact with the fixed mold insert 9 to play a limiting role, and the dovetail groove insert 10 body Cooperate with the guide block 12 on the surface, the square protrusion on the top of the dovetail groove insert 10 cooperates with the square hole of the guide block 12 on all sides, which plays a role of limiting, and is locked by bolts;

The dovetail table insert 11 is a square insert and is provided with a dovetail table, a hanging table, and two parallel straight faces. The dovetail table insert 11 is connected with the fixed mold insert 9 as a hanging table. 9 is surface fit and limit; the shoulder bolt B14 is covered with spring B17, and through the limit sleeve 19, it is threaded and locked with the dovetail insert 11, and the limit sleeve 19 and the fixed mold insert 21 are surface fit and fixed. Positioning by jack wire 20;

The guide block 12 is matched with the guide block fixed block 18, and the four surfaces of the guide block 12 cooperate with the inner surface of the cavity of the guide block fixed block 18 to slide, which plays the role of limiting and guiding. The shoulder bolt A13 is covered with a spring A16 is screwed and fixed with the fixed mold insert 9, the spring A16 cooperates with the guide block 12 and the fixed mold insert 9 and acts as a limiter, the guide block fixed block 18 and the fixed mold insert 9 are surface matched, Locked by bolts, the guide block fixed block 18 is connected with the fixed template 3 through a hanging platform, and is matched with the cavity of the fixed template 3 and limited, and locked by bolts; the fixed mold insert 9 and the fixed template 3 are surface Cooperate and limit, and lock through bolts;

When the mold is opened, the guide block 12 is separated from the fixed mold insert 9 under the tension of the spring A 16, and the guide block 12 drives the dovetail insert 10 locked with it to slide along the dovetail direction, while the dovetail insert 10 slides, The dovetail groove insert 10 is separated from the inclined surface in contact with the fixed mold insert 9, and the limit function is cancelled. At the same time, under the tension of the spring B17, the dovetail table insert 11 slides laterally, and the undercut part of the plastic product comes out;

When the mold is closed, the runner push plate 2 is in contact with the guide block 12 and pushes the guide block 12 to slide, and the dovetail groove insert 10 connected with the guide block 12 slides along the dovetail direction, and finally contacts and resets with the slope of the fixed mold insert 9 , when the dovetail groove insert 10 slides, push the dovetail table insert 11 to slide laterally and reset.

The beneficial effects of the invention are: through the combined application of the dovetail groove and the spring mechanism, the undercut in the complex shape of the plastic product is realized, the mold structure is simplified, the mold space is saved, and the production efficiency is improved. the

Description of drawings

Below in conjunction with accompanying drawing, with embodiment concrete description.

Figure 1 is a schematic diagram of the mold mechanism.

Fig. 2 is the second schematic diagram of the mold mechanism.

Fig. 3 is a schematic diagram of the complete mold opening of the mold mechanism.

Fig. 4 is a schematic diagram of the mold opening of the dovetail groove of the mold mechanism.

In the figure: 1 fixed die seat plate; 2 runner push plate; 3 fixed die plate; 4 movable die plate; 5 square iron; 6 face needle plate; 7 bottom needle plate; Dovetail groove insert; 11 Dovetail table insert; 12 Guide block; 13 Shoulder bolt A; 14 Shoulder bolt B; 15 Moving mold insert; 16 Spring A; 17 Spring B; 18 Guide block fixed block; set; 20 top wires; 21 fixed mold inserts; 22 ejector pins.

Detailed ways

Specific embodiments of the invention will be described in detail below in conjunction with technical text and accompanying drawings.

Assembling the dovetail groove and spring mechanism in the mold, the dovetail groove insert 10 is fitted into the guide block 12 and locked by bolts, the guide block 12 is fitted into the guide block fixed block 18, and the guide block fixed block 18 is locked with bolts On the fixed template 3, the shoulder bolt A13 passes through the guide block 12 and then puts on the spring A16, and the thread on the head of the shoulder bolt A13 is fixed on the fixed mold insert 9; the spring B17 is assembled on the fixed mold insert 21, and the fixed mold insert 21 The mold insert 21, the limit sleeve 19 and the dovetail insert 11 are assembled on the fixed mold insert 9, the shoulder bolt B14 passes through the limit sleeve 19 and the spring B17 and is threaded and fixed with the dovetail insert 11, and the dovetail The groove insert 10 and the dovetail table insert 11 are connected by the dovetail groove, and the spacer sleeve 19 cooperates with the fixed mold insert 21 and is positioned by the top wire 20 .

When the mold is opened, the runner push plate 2 and the fixed template 3 spring apart under the action of the spring tension, the fixed mold seat plate 1 and the runner push plate 2 are separated, the fixed template 3 and the movable template 4 are separated, and under the action of the tension of the spring A 16 The lower guide block 12 is separated from the fixed mold insert 9, and the guide block 12 drives the dovetail groove insert 10 locked with it to slide along the dovetail direction, while the dovetail groove insert 10 slides, the dovetail groove insert 10 and the fixed mold insert 9 The contacting slopes are separated, and the limit function is cancelled. At the same time, under the tension of the spring B17, the insert 11 of the dovetail table slides laterally, and the undercut part of the plastic product comes out (see Figure 4). Out of plastic products (see Figure 3).

When the mold is closed, the runner push plate 2 is in contact with the guide block 12 and pushes the guide block 12 to slide, and the dovetail groove insert 10 connected with the guide block 12 slides along the dovetail direction, and finally contacts and resets with the slope of the fixed mold insert 9 , when the dovetail groove insert 10 slides, push the dovetail table insert 11 to slide horizontally and reset, the fixed mold insert 9 is in contact with the movable mold insert 15, the fixed template 3 is in contact with the movable touch panel 4 (see Figure 1), Clamping is complete.

Claims (1)

1. a mould of deviating from plastic products by dovetail groove and spring mechanism, the mould bases of this mechanism comprises: top clamping plate (1), runner ejection plate (2), solid plate (3), moving platen (4), square iron (5), face needle plate (6), end needle plate (7) and Bottom clamp plate (8), internal structure comprises: fixed die insert (9), dovetail groove mold insert (10), forked tail platform mold insert (11), guide pad (12), shouldered tap bolt A(13), shouldered tap bolt B(14), moving die insert (15), spring A(16), spring B (17), guide pad fixed block (18), stop collar (19), jackscrew (20), cover half mold insert (21), push rod (22),

It is characterized in that: inner connecting way is, dovetail groove mold insert (10) is for square mold insert and be provided with dovetail groove, inclined-plane, what parallel two faces directly and square boss, wherein dovetail groove is connected and is played spacing and guide effect by dovetail for face coordinates with forked tail platform mold insert (11), inclined-plane and fixed die insert (9) coordinate for face, played the effect of spacing wedging, what parallel two faces directly with fixed die insert (9) face and contacts and play position-limiting action, dovetail groove mold insert (10) body and guide pad (12) coordinate for face, the square convex at dovetail groove mold insert (10) top coordinates on four sides with the square cave of guide pad (12), played spacing effect, and pass through bolt-locking,

Forked tail platform mold insert (11) is for square mold insert and be provided with forked tail platform, hanging platform, two facing directly of paralleling, forked tail platform mold insert (11) with fixed die insert (9) for hanging platform is connected, parallel two face directly also spacing for face coordinates with fixed die insert (9); Shouldered tap bolt B(14) cover has spring B (17), and by stop collar (19), is threaded and locks with forked tail platform mold insert (11), and stop collar (19) is joined merga pass jackscrew (20) with cover half mold insert (21) for face and located;

Guide pad (12) and guide pad fixed block (18) coordinate for face, four faces of guide pad (12) coordinate and slide with the die cavity inner surface of guide pad fixed block (18), play spacing and guide effect, shouldered tap bolt A(13) cover has spring A(16) also fixing with fixed die insert (9) screw-threaded coupling, spring A(16) with guide pad (12), fixed die insert (9) coordinates and plays position-limiting action for face, guide pad fixed block (18) and fixed die insert (9) coordinate for face, by bolt-locking, guide pad fixed block (18) is connected by hanging platform with solid plate (3), and be that face coordinates and spacing with the die cavity of solid plate (3), pass through bolt-locking, fixed die insert (9) is also spacing for face coordinates with solid plate (3), passes through bolt-locking,

During die sinking, at spring A(16) guide pad (12) separates with fixed die insert (9) under tension force effect, guide pad (12) drives with the dovetail groove mold insert (10) of its locking and slides along dovetail direction, when dovetail groove mold insert (10) slides, dovetail groove mold insert (10) separates with the inclined-plane that fixed die insert (9) contacts, position-limiting action is cancelled, and under spring B (17) tension force effect, forked tail platform mold insert (11) laterally slides simultaneously, deviates from plastic product back-off part;

During matched moulds, runner ejection plate (2) contacts pusher action-oriented piece (12) and slides with guide pad (12) face, the dovetail groove mold insert (10) being connected with guide pad (12) slides along dovetail direction, finally contact and reset with the inclined-plane of fixed die insert (9), dovetail groove mold insert (10) promotes forked tail platform mold insert (11) when sliding and laterally slides and reset.

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