JPH0740351A - Mold assembly - Google Patents

Abstract

PURPOSE:To firmly and accurately position and fix a protuberance separately mounted on the outer periphery of an insert of a mold by simple structure and assembling operation. CONSTITUTION:On the outer periphery of an insert 3, a recessed groove 9 is provided in parallel to the axial direction of the insert 3. A base part 8c of a protuberance 8b of another member is fitted into the groove. In this manner, a recessed and projected shape corresponding to the inner periphery of a recessed part of a molded piece is formed on the outer periphery of the insert 3. At this time, the recessed groove 9 is a dovetail groove 9 tapered from the top of the insert 3 to the base part thereof, and the base part 8c of the protuberance 8b fitted into the groove is a dovetail 8c. The protuberance 8b is mounted in a positioned state by pressing the protuberance 8b into a predetermined fitting position of the dovetail 8c in the dovetail groove 9 by a presser member 11 mounted on the top of the insert 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device, and more specifically, a recessed groove parallel to the axial direction of the insert is provided on the outer periphery of the insert for molding the recess of the molded product. Relating to a mold device in which a ridge formed on the outer periphery of a ridge is formed by a separate member and the base of the ridge is fitted to form an uneven ridge shape corresponding to the inner peripheral shape of the recess of the molded product on the outer periphery of the insert. And is used, for example, when molding a resin sirocco fan impeller.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional mold device of this type. As shown in the figure, between the fixed-side template a arranged on the upper side and the movable-side template b arranged on the lower side, a nest c included in the movable-side template b and a position around it. A cavity e is formed between the blade and the slide nest d, and a resin-made sirocco fan impeller 21 as shown in FIG. 5 is formed.

The impeller 21 has a large number of blades 2 between the outer periphery of the side plate 21a and the connecting ring 21b corresponding to this outer periphery.
I have 1c.

Correspondingly, the cavity e has a side plate portion molding portion e1, a connecting ring molding portion e2, and a required number of blade molding portions e3, as shown in FIG. 4 (b). .

In particular, the large number of blade forming portions e3 form the inner peripheral shape of the recess 21f in which the large number of blades 21c of the impeller 21 are arranged, and the outer peripheral shape of the insert c is shown in FIG. 4 (a). As described above, the concave and convex portions have a concavo-convex strip shape that conforms to the inner peripheral shape of the concave portion 21f, whereby the impeller 21 as shown in FIG. 5 can be molded.

By the way, the concavo-convex stripe shape of the insert c is such that between the plurality of convex stripes g provided on the outer periphery of the insert c so as to face the axial direction of the insert c, there is a concave stripe extending in the axial direction of the insert c. The blade molding portion e3 is formed so that

Then, every other one of these many ridges g is a ridge g1 formed in the same body as the nest c, and the other is a ridge g2 which is retrofitted to the nest c and integrated. .

This is because if all of the ridges g are formed in the nest c in the same body, the blade molding portion e3 is narrow and it is difficult to process the ridges. Is.

The ridge g2 is retrofitted by first forming a simple groove h on the outer peripheral surface of the insert c parallel to the axial direction of the insert c, and fitting the base portion i of the ridge g2 into this groove for positioning. This positioning results in fixing the ridge g2 in the circumferential direction of the insert c indicated by the arrow Y.

Next, in order to fix the ridge g2 at this positioning position, a pressing plate j is attached to the tip of the insert c,
The ridge g2 is pressed by the outer peripheral portion of the pressing plate j,
Thereby, it is fixed to the movable side mold plate b in the axial direction of the insert c indicated by the arrow Z.

Further, a downward catching flange j1 provided on the lower surface of the outer peripheral portion of the presser plate j is a base portion i of the ridge g2.
The upper end of the convex strip g2 is fixed in the radial direction of the nest c indicated by the arrow X by fitting in the circumferential groove k that is concentric with the nest c provided at the upper end of the nest c.

Further, the lower end of the convex strip g2 has a movable side mold plate b.
On the other hand, they are individually attached by bolts m and fixed in the radial direction of the insert c indicated by arrow X.

As a result of the above, the ridge g2 is integrated with the insert c, and the ridge portion g1 and the blade molding portion e3 having a required shape and size are formed to form the impeller 21 as described above. can do.

[0014]

However, in the fixing method as described above, the mounting by the pressing plate j at the upper end of the ridge g2 and the individual mounting by the bolt m at the lower end of the ridge g2. Therefore, the mounting structure is complicated, the number of parts and the number of work steps are large, and the cost is high.

Moreover, since the ridge g2 can be fixed in the X direction only at the upper end and the lower end of the ridge g2,
Fixing and positioning in the central part of the integrated ridge is loose,
The dimensional accuracy of the molded product deteriorates due to some deformation due to heat during molding, etc., and burrs are generated due to the gap formed between the insert c and the ridge g2, and the quality of the molded product is improved. There is also the inconvenience of lowering.

An object of the present invention is to solve such a problem, and a simple structure and an assembling work are easy.
An object of the present invention is to provide a mold device that can be positioned and fixed firmly and accurately.

[0017]

In order to achieve the above-mentioned object, the mold device of the present invention has a groove parallel to the axial direction of the insert on the outer periphery of the insert forming the recess of the molded product. By providing a ridge provided on the outer circumference of the insert in this groove with a base of a ridge formed by a separate member, an uneven ridge corresponding to the inner peripheral shape of the recess of the molded product is formed on the outer periphery of the insert. In a mold device having a shape, the concave groove and the base of the convex strip that fits in the concave groove are tapered dovetail grooves that taper from the tip side of the insert toward the base side, By the pressing member with the strip attached to the tip of the insert,
Press the dovetail into the dovetail groove at the specified mating position,
This is characterized in that the ridges are attached in a positioned state.

[0018]

In the above-described structure of the mold apparatus of the present invention, the concave-convex strip shape corresponding to the inner peripheral shape of the recessed portion of the molded article of the nest is formed by the post-projected strip body. Since there is a dovetail groove parallel to the direction, and the dovetail that forms the base of the above-mentioned convex body is fitted and attached to this, the radius of the nest as well as the outer peripheral direction of the nest is dependent on the shape of the dovetail wrapping with the dovetail. The ridges can be positioned over the entire length in any direction, and the ridges can be firmly positioned in any direction simply by pressing the ridges at the fitting position with the pressing member attached to the tip of the insert. Can be fixed.

Moreover, since the dovetail groove and the dovetail that are fitted together have a taper shape that becomes narrower from the tip of the nest toward the base part, there is a wedge-like action in fitting the dovetail into the dovetail groove, and Since a tight fit with no play is possible, the positioning and fixing can be achieved with high precision without play in any part.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mold apparatus as an embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the mold apparatus of this embodiment has the following structure.
Between the fixed-side mold plate 1 arranged on the upper side and the movable-side mold plate 2 arranged on the lower side, a nest 3 included in the movable-side mold plate 2 and a slide nest 4 positioned around the nest 3 A cavity 5 is formed between the above and the resin, and an impeller 21 of a resin sirocco fan as shown in FIG. 5 is formed.
The slide insert 4 is divided at several places around the insert 3 so that the slide insert 4 can slide in the direction indicated by the arrow A.

The slide insert 4 has a guide hole 7 which fits with a guide projection 6 which projects obliquely outward and downward from the fixed mold plate 1, and the movable mold plate 2 is opened downward by a mold opening operation. However, when the slide nest 4 moves together,
When the slide insert 4 moves along with the movable mold plate 2 moving upward by the mold closing, the guide protrusion 6 and the guide hole 7 are automatically opened to the outside by the guide. The guide 6 and the guide hole 7 are fitted together to automatically close the inside.

As shown in FIGS. 1 and 2 (b), the cavity 5 has a side plate portion forming portion 5a for forming the side plate portion 21a of the impeller 21 and a connecting ring forming portion for forming the connecting ring portion 21b of the impeller 21. It has a portion 5b and a blade forming portion 5c for forming a required number of blades 21c of the impeller 21.

The large number of blade-forming portions 5c are used in the impeller 2
In order to form the inner peripheral shape of the recessed portion 21f in which a large number of blades 21c of 1 are arranged, the outer peripheral shape of the nest 3 is set to the recessed portion 21.
It has a concavo-convex stripe shape as shown in FIG. 2 (a) that conforms to the inner peripheral shape of f, and thus the impeller 21 as shown in FIG. 5 can be molded.

The concavo-convex stripe shape of the insert 3 is such that a slit-like recess extending in the axial direction of the insert 3 is provided between a large number of projections 8 provided on the outer periphery of the insert 3 so as to face the axial direction of the insert 3. The blade forming portion 5c is formed as.

As in the conventional case, the ridges 8a are formed by forming every other one of these many ridges 8 in the same body as the insert 3.
The other is a ridge 8b that is integrated with the nest 3 by retrofitting it.

This eliminates the inconvenience in the case where all of the ridges 8 are formed in the nest 3 in the same body, that is, the inconvenience that the blade molding portion 5c is narrow and the machining is difficult, and the machining is facilitated.

The ridges 8b are retrofitted by positioning the bases 8c of the ridges 8b by fitting the grooves 8 on the outer peripheral surface of the ridges 3 parallel to the axial direction of the ridges 3. In the present embodiment, in particular, the concave groove 9 and the base portion 8c of the convex strip that fits into the concave groove 9 are formed into a tapered dovetail groove that narrows from the tip side of the insert 3 toward the base side, and the convex stripe is formed. Body 8b
With the pressing plate 11 provided at the tip of the insert 3, the dovetail 8c
The ridge 8b is pressed into a predetermined fitting position in the dovetail groove 9 to fix the ridge 8b in the positioned state.

The dimensional relationship for forming the dovetail groove 9 and the dovetail 8c in the taper shape in this embodiment is as shown in FIGS. 2 (b) and 3; 2 as b2
There is a difference of Δb, and the depth dimension is set to have a difference of Δt with the base depth t1 <the tip depth t2.

As described above, the convex-concave portion 8 formed integrally with the insert 3 has the concave-convex shape corresponding to the inner peripheral shape of the recess 21f of the impeller 21 of the sirocco fan which is the molded product of the insert 3.
a and a ridge 8b that is attached later,
There is a dovetail groove 9 parallel to the axial direction of the nesting 3 to be retrofitted as a dovetail groove, and the dovetail 8c portion that forms the base of the convex strip 8b is fitted and attached to the dovetail groove 9. Due to the insertion shape, the protrusion 8b can be firmly positioned over the entire length not only in the outer peripheral direction of the nest 3 shown by the arrow Y but also in the radial direction of the nest 3 shown by the arrow X, and at the tip of the nest 3. Press the protruding plate 8b to the fitting position with the pressing plate 11 to be attached, and press the arrow Z
By simply positioning and fixing the nest 3 in the axial direction of the nest 3, the respective portions of the ridge 5b can be firmly positioned and fixed in any of X, Y, and Z directions.

Moreover, since the dovetail groove 9 and the dovetail 8c to be fitted are tapered so as to become thinner from the tip of the insert 3 toward the base portion, a wedge-like function is provided for fitting the dovetail 8c into the dovetail groove 9. Therefore, since a tight fit can be made without any play, the positioning and fixing can be achieved with high precision without play in any part.

Therefore, the molded product can be molded with high dimensional accuracy and with high precision, and a gap is formed between the protruding member and the nest due to a part of lifting, and burrs are generated in the molded product. Also, it is possible to prevent the quality from being deteriorated due to the occurrence of burrs.

Further, the structure is simple, the number of parts and the number of assembling steps are small, and the cost can be reduced.

It is sufficient that the dovetail groove 9 and the dovetail 8c are fitted to each other so as to obtain a wedge-like function for positioning and fixing the convex body 8b as described above, and the gradient of Δb on one side is omitted. It is sufficient to have a taper gradient in one direction in the width direction and the depth direction.

Further, although every other one of the ridges 8 is formed by the ridges 8b which are separate members, the present invention is not limited to this, and the ridges 8b are applied to all the ridges 8, for example. You can also

Further, although the case where the impeller 21 of the resin sirocco fan is molded is described in the present embodiment, the present invention is not limited to this. The present invention is generally applicable to other types of impellers and molded products having a complicated concave-convex strip shape on the inner surface of the recess.

[0037]

According to the mold apparatus of the present invention, a convex strip body, which is a separate member for forming a concave-convex strip shape corresponding to the inner peripheral shape of the hollow portion of the molded product of the insert, is formed with a dovetail groove and an dovetail. After the attachment, the ridges of the nesting side dovetails are firmly positioned in the outer peripheral direction and the radial direction of the nest, and the nesting The ridges can be firmly positioned and fixed in any direction simply by pressing the ridges into the dovetail groove and dovetails with the pressing member attached to the tip and positioning them in the axial direction of the insert. Therefore, the structure and the assembling with a small number of parts and man-hours for assembling can be simplified, and the cost can be reduced.

Moreover, the dovetail groove and the dovetail have a taper shape that narrows from the tip of the insert toward the base.
Since there is a wedge-like action in fitting each other and there is no play on the whole, the positioning and fixing can be achieved with high precision without any play on any part, so that the molded product is molded with higher dimensional accuracy. It is possible to prevent the occurrence of burrs due to a part of the floating between the ridge and the nest, and to prevent the quality of the molded product from deteriorating due to burrs. can do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an assembled state of a resin molding die as one embodiment to which the present invention is applied.

2 is a plan view and a cross-sectional view showing in detail a nesting portion of the mold device of FIG. 1. FIG.

3 is a perspective view showing a part of a nest of the mold device of FIG. 1. FIG.

FIG. 4 is a plan view and a cross-sectional view showing in detail a nesting portion of a resin molding die of a conventional example.

FIG. 5 is a perspective view of an impeller of a resin sirocco fan showing an example of a molded product.

[Explanation of symbols]

 3 Nesting 5 Cavity 5a Side plate forming part 5b Connecting ring forming part 5c Vane forming part 8 Convex ridge 8a Convex ridge 8b Convex ridge 8c Ari 9 Dovetail groove 11 Holding member b1 Base width b2 Tip width t1 Base depth t2 Tip Depth

Claims (1)

[Claims] 1. A ridge formed by forming a groove parallel to the axial direction of the insert on the outer periphery of the insert forming the recess of the molded product, and forming a ridge provided on the outer periphery of the insert in this recess as a separate member. By fitting the base portion of the body, in the mold device in which the concavo-convex strip shape corresponding to the inner peripheral shape of the recessed portion of the molded product is formed on the outer periphery of the insert, the concave groove and the convex strip body fitted to the concave groove are formed. The base is a tapered dovetail groove that narrows from the tip side of the insert to the base side, and the dovetail is attached to the dovetail by the pressing member with the protruding body attached to the tip of the insert. A mold apparatus characterized in that it is pressed into a fitting position and the ridges are attached in a positioned state.