JP3051046B2 - Molding equipment for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die apparatus, and more particularly, to a section U having a projection partly inward of a product.
TECHNICAL FIELD The present invention relates to a mold apparatus for molding a synthetic resin molded article having a letter shape.

[0002]

2. Description of the Related Art For example, as shown in FIG. 10 of the accompanying drawings, when a synthetic resin molded article M having a substantially semi-cylindrical cross-section having a U-shaped cross section and having projecting portions P, P partially inside the product is required. Since the projecting portion P is a so-called undercut portion, FIG.
A mold device 60 as shown in FIG. 13 is used.
That is, this mold device 60 is composed of a molding die 70 including a fixed die 80 having a cavity die portion 81 and a movable die 90 having a core die portion 91, and a part of the core die portion 91 is an elongated middle core die 100. Composed of The core mold 100 can be freely moved in and out of the cavity mold part 81 by a known cylinder device 110. When the molded product is taken out after molding, the core mold 100 is connected to a solid line as shown in FIG. The molded article M is released from the position to the chain line position 100A in the outward direction, and the mold M is released. Reference numeral 92 in the figure denotes a molding recess for a protrusion P formed by the mold surface of the movable mold 90 and the mold surface of the core mold 100 near the end of the core mold part 91, and 96 denotes movement of the core mold 100. The slide guide groove provided in the movable mold 90 for the above purpose, 99 is a protruding pin of a molded product, 111 is a cylinder body of the cylinder device 110, and 112 is an operating rod of the cylinder device 110.

In the molding die apparatus 60, as described above, the cylinder device 110 is operated every time the molded article M is taken out in order to avoid an undercut portion which hinders taking out of the molded article. It is necessary to repeat the operation of moving the core mold 100 in the outward direction and returning the core mold 100 to the original position again at the next molding. However,
Such reciprocating movement of the core mold 100 takes time, prolongs the molding cycle, and tends to reduce production efficiency.

[0004] In particular, when the length L of the molded article M is large, the moving distance of the core mold 100 becomes long, and the mold apparatus 60
Requires a slide guide groove 96 of a predetermined length for the reciprocating movement of the core mold 100, and furthermore, as shown in the embodiment, depending on the length L of the molded article M, the slide mold 100 and its cylinder device may be used. It is necessary to use two devices on the left and right sides, and there are also cost and equipment problems that the device becomes large or complicated.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
In order to solve such a problem, it has been proposed that a molded product having a protruding portion to the inside of a product can be easily and easily and effectively taken out, so that a molding cycle is short, and It is an object of the present invention to provide a molding die device that can be downsized in size.

[0006]

That is, the present invention provides:
A mold device for molding a substantially semi-cylindrical synthetic resin molded product having a U-shaped cross section partially having a protruding portion toward the inside of a product, wherein an outer peripheral surface of the substantially semi-cylindrical molded product is defined. A fixed mold having a cavity mold portion to be formed, and a movable mold having a core mold portion defining an inner peripheral surface of the molded product, wherein the core mold portion has the molded product protruding portion near an end of the mold surface. When the movable mold is opened in a mold portion having a molding concave portion for molding and not including the molding concave portion on the same mold surface side as the molding concave portion, a slide guide groove of the movable mold is formed on the outer periphery of the molded product. In a device provided with a slide type part which slides in the direction, a movable stopper member is provided in the slide guide groove of the movable type, and the slide type part slides when the mold is opened. Sometimes the molded product projecting part is a general mold of the core mold part. At the position further moved outward, an engagement concave portion is formed for engaging the stopper member, and a concave groove portion extending in a direction perpendicular to the moving direction of the slide mold portion is formed on a mold surface of the slide mold portion. A plurality of ribs having a semicircular cross section are formed on the inner peripheral surface of the molded article by the concave grooves, and the molded article and the molded article are formed when the slide mold section moves outward when the mold is opened. The present invention relates to a molding die apparatus characterized in that an appropriate resistance is applied to a slide die part.

[0007]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of a molding die apparatus, and FIG.
FIG. 3 is a cross-sectional view showing a main part of the movable die of the same mold apparatus, FIG. 3 is a perspective view showing a main part of the movable mold, FIG. FIG. 6 is a cross-sectional view of the main part showing the opened state of the mold, FIG. 6 is a cross-sectional view of the main part showing the end state of the movement of the slide die, FIG. FIG. 9 is a cross-sectional view of a main part showing a molded product protruding state of the molded product.

The molding die used in the molding die apparatus of the present invention has a substantially semicircular U-shaped cross section partially having a protruding portion P inwardly of the product as shown in FIG. 1 and 2 for molding a synthetic resin molded article M.
As shown in FIG. 1, the mold M includes a fixed mold 10 having a cavity mold portion 11 defining an outer peripheral surface of the molded product M, and a movable mold 20 having a core mold portion 21 defining an inner peripheral surface of the molded product. In the vicinity of the end of the mold surface 22 of the core mold portion 21 of the movable mold 20,
As well understood from FIG. 1 and FIG. 3 which is a perspective view of the movable mold 20, a molding concave portion 23 for molding the projecting portion P of the molded product M is formed.

The mold portion of the core mold portion 21 of the movable mold 20 which does not include the molding recess 23 on the same mold surface side as the molding recess 23 is provided when the movable mold 20 is opened. And a slide die portion 30 that slides in the slide guide groove 24 in the outer peripheral direction w of the molded product.
When the movable mold 20 is opened, the slide mold portion 30 moves in the outer peripheral direction w of the molded product and pushes out the molded product from the inside, so that the molded product portion (projected portion P) in the concave portion 23 for molding is formed. The molded product is released from the general mold surface 22 of the core mold portion 21 outside the mold.

That is, as can be clearly understood from the cross-sectional views of FIGS. 1 and 2 and the perspective view of FIG.
Since the concave portions 23 for molding are provided on the left and right sides near both ends of the core mold portion 21, a part of the central portion of the core mold portion 21 is partially left and right as indicated by a chain line and an arrow w in FIG. 3. Are configured as the slide-type portions 30, 30 that move in the outer circumferential direction w of the.

In this example, as shown in FIG. 2, the inclined pins 15, 15 projecting outward from the parting surface T of the fixed mold 10 are provided. Are formed with through holes 36 into which the inclined pins 15 are inserted. This inclined pin 15
And the through hole 36, the slide mold parts 30, 30 can be opened at the time of opening the mold apparatus as in a known slide mold structure.
Simultaneously with the movement of the movable mold 20, the movable pins 20 move to the left and right outer sides in the drawing, which are the directions of inclination of the inclined pins 15, 15, respectively.

Further, in this apparatus, as shown in the figure, a stopper member 25 is provided in the slide guide groove 24 of the movable mold 20 so as to be able to move in and out.
0 is an engagement recess in which the stopper member 25 is engaged at a position where the molded product protrusion P moves outward from the general mold surface of the core mold 21 when the slide mold 30 slides when the mold is opened. 37 are formed. In this example, a spring pin is used as the movable stopper member 25,
The engagement recess 37 of the slide mold portion 30 is
To stop the movement. Note that reference numeral 40 in FIG.
Is a protruding pin of a molded product, and reference numeral 12 in FIG. 2 is an injection hole of a synthetic resin molding material.

The mechanism of the above mold apparatus will be described in more detail together with the operation. 4 to 7 show, in the order of the drawings, a state in which the molded article M having the protruding portion P to the inside of the product is taken out after molding, and the left half of each figure is a slide. The mold portion provided with the mold 30 and the right half simultaneously show respective cross sections of the mold portion provided with the molding recess 23.

As shown in FIG. 4, a molded article M
Is a molding recess 23 at the end of the core mold portion 21 of the movable mold 20.
Therefore, since the protrusion P has a protrusion P protruding inside the molded article M, the protrusion P serves as a so-called undercut portion. Therefore, in this device, the protrusion P protruding inside the molded product M is pushed out from the general mold surface 22 of the core mold 21 by the slide mold 30 by the operation described below, and the protrusion P is spread. The molded product is taken out after being removed from the molding concave portion 23.

That is, as shown in FIG. 5, when the movable mold 20 moves in the direction of arrow a when the mold is opened, the movable mold 2
As described above, the slide die 30 provided on the fixed die 10 is tilted by the inclined pins 15 of the fixed die 10 inserted into the through holes 36 of the slide die 30 so that the inclination directions of the inclined pins 15, 15 are left and right directions. move to w respectively. By the movement of the slide die 30 in the outward direction w, the molded article M is pushed out from the inside to the outside.

Then, as shown in FIG.
0 slides in the slide guide groove 24 of the movable mold 20 and moves until the protrusion P of the molded product M is located outside the general mold surface 22 of the core mold 21. The concave portion 37 engages with a stopper member 25 formed of a spring pin provided to be able to move in and out of the slide guide groove 24, and the slide die 20 stops moving there. This is to prevent the molded product M from being deformed or broken due to excessive spreading.

Next, as shown in FIG. 7, the movable mold 20 is completely separated from the fixed mold 10 and the slide mold 30 is moved so that the protrusion P of the molded product M is outside the general mold surface 22 of the core mold 21. In the state in which the molded product M is located at the side, the protruding pins 40, 40 provided on the movable mold 20 advance to release the molded product M from the movable mold 20 (slide mold portion 30). At this time, since the protruding portion P of the molded product M is located outside the general mold surface 22 of the core mold 21, the protrusion is smoothly taken out without interfering with the mold surface 22.

The height (depth) of the protruding portion P of the molded product M
And the travel distance of the slide mold 30
Of course, this is a problem of the deformability of the molded article M, which depends on the material, size, shape and the like. Generally speaking,
When the material is polypropylene, polyethylene, or the like, the deformability of the molded product is large, and the height (depth) of the protrusion P, that is, the moving distance of the slide mold 30 can be about 4 mm. When an ABS resin (acrylonitrile-butadiene-styrene resin) is used, the thickness is preferably about 2 mm.

In the apparatus of the present invention, as shown in FIGS. 8 and 9, a concave surface extending in a direction perpendicular to the moving direction w of the slide die 30A is formed on the die surface 31A of the slide die 30A having the above-described structure. A plurality of grooves 33 are formed. The concave groove portion 33 forms a rib R having a semicircular cross section on the inner peripheral surface of the molded product M1 at the time of molding, and when the slide mold portion 30A moves outward when the mold is opened, the molded product M1 is formed.
And a suitable resistance between the slide mold portion 30A. This ensures that the molded product M1 is expanded outward in the outward direction, and prevents the molded product M1 from unexpectedly falling out of the slide mold portion 30A or the core mold portion 20A.

As shown in FIG. 9, the concave groove 33 preferably has a curved cross-section in order to efficiently release the molded product M1 by using the protruding pins 40A during release. The concave groove portion 33 in the illustrated example has a radius of 0.5 to 0.8 mm.
, Three of which are provided in parallel with each of the slide mold portions 30A. Since the ribs R formed on the molded product M1 are thin and provided on the inner peripheral surface of the product, the appearance of the molded product M1 does not deteriorate. In FIGS. 8 and 9, the same reference numerals as those in the previous embodiment denote the same components.

[0021]

As shown and described above, according to the molding die of the present invention, when the mold is opened, the slide mold portion is slid outward, and the projecting portion of the molded product toward the inside of the product is formed by the core mold portion. By extruding outward from the general mold surface, a molded product having a protruding portion toward the inside of the product can be easily and easily removed from the mold surface. In addition, since the sliding distance of the slide mold portion required to push the protrusion of the molded article toward the inside of the product out of the general mold surface is substantially equal to the protrusion length of the protrusion from the general portion, it is short. Sliding does not take much time, shortens the molding cycle and increases efficiency. Further, since the moving distance of the slide mold portion is short, the molding die can be reduced in size and simplified.

In particular, according to the apparatus of the present invention, the movement of the slide mold portion is stopped by the engagement between the stopper member provided in the slide guide groove and being freely accessible and the engagement recess of the slide mold portion. Deformation and destruction of the article M due to excessive spreading can be prevented. Also, a plurality of concave grooves formed on the mold surface of the slide mold portion form a semicircular rib on the inner peripheral surface of the molded product, and the molded product is moved when the slide mold portion is moved when the mold is opened. And a suitable resistance between the slide mold portion and the slide mold portion, so that the molded product can be reliably pushed outward and spread out, and the molded product comes out of the slide mold portion or the core mold portion unexpectedly. Is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an example of a molding die apparatus.

FIG. 2 is a sectional view of a main part of another part of the same mold apparatus, which is cut.

FIG. 3 is a perspective view showing a main part of the movable type.

FIG. 4 is a cross-sectional view showing a main part of a mold device immediately after molding.

FIG. 5 is a cross-sectional view of a main part showing the mold open state.

FIG. 6 is a cross-sectional view of a main part showing a state in which the movement of the slide die is completed.

FIG. 7 is a sectional view of a main part showing a state in which a molded product is protruded.

FIG. 8 is a cross-sectional view of a main part showing a molding state of a molded article of the apparatus of the present invention.

FIG. 9 is a cross-sectional view of a main part showing the state in which the molded product protrudes.

FIG. 10 is a perspective view showing an example of a molded product having a protruding portion toward the inside of a product.

FIG. 11 is a front view showing an example of a conventional molding die apparatus.

FIG. 12 is an enlarged sectional view of a main part thereof.

FIG. 13 is a sectional view taken along line 13-13 in FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed type | mold 11 Cavity type | mold part 20 Movable type | mold 21 Core type | mold part 22 (general) type | mold surface of a core type | mold 23 Forming recess 24 Slide guide groove 25 Stopper member 30 Slide type part 33 Groove 37 Engagement concave M Synthetic resin molding Product P Molded product protrusion R Rib

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-39869 (JP, A) JP-A-4-316817 (JP, A) JP-A-4-185309 (JP, A) JP-A-4-185309 135726 (JP, A) JP-A-1-76537 (JP, A) JP-A-60-92819 (JP, A) JP-A-8-281726 (JP, A) JP-A-2-24919 (JP, U) Japanese Utility Model Application No. 3-72416 (JP, U) Japanese Utility Model Application No. Sho 61-111712 (JP, U) Japanese Utility Model Application No. 56-24226 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 33/44 B29C 45/33 B29C 45/44

Claims (1)

(57) [Claims] 1. A mold apparatus for molding a substantially semi-cylindrical synthetic resin molded article having a U-shaped cross section partially having a protruding portion toward the inside of the product, wherein the substantially semi-cylindrical molded article is formed. A fixed mold having a cavity mold part defining an outer peripheral surface of the molded product; and a movable mold having a core mold part defining an inner peripheral surface of the molded product, wherein the core mold part is provided near an end of the mold surface. A slide guide groove of the movable mold when the movable mold is opened in a mold part having a molding recess for molding the molded product projecting part and not including the molding recess on the same mold surface side as the molding recess. In a device provided with a slide mold portion that slides in the outer peripheral direction of the molded product, a stopper member is provided in the slide guide groove of the movable mold so as to be able to move in and out. When the slide mold part slides, the molded product protrusions An engagement concave portion is formed at a position outwardly moved from the general mold surface of the mold portion so that the stopper member engages. The mold surface of the slide mold portion is perpendicular to the moving direction of the slide mold portion. A plurality of concave grooves extending in the direction are formed,
A rib having a semicircular cross-section is formed on the inner peripheral surface of the molded product by the concave groove portion. A molding die apparatus characterized in that an appropriate resistance is applied.