JPH01135615A - Cotter of mold for integrally molding different lenses - Google Patents

Abstract

PURPOSE:To make it possible to design the size and shape of a cavity formed by slide cores with freedom by a method wherein the cotter concerned is arranged to the rear end of one slide core so as to fasten the slide core, which moves to one side or the other side in a guide hole, to the predetermined site in the guide hole by being slidingly moved in the direction normal to the sliding axis line of the slide core. CONSTITUTION:A cotter 6, which is normal to the sliding direction of a slide core (b) and engages wedgewise with the slide core (b) by slidingly moving in the direction normal to the sliding axis line of the slide core (b) at the rear end side of the slide core, is arranged at the rear end side of the slide core (b). On respective engaging surfaces to be abutted against each other, several teeth or projected and recessed parts 7a and 7b are formed so as to support the slide core (b) at its rising limit side under the condition that the projected parts 7a of both the slide core (b) and of the cotter 6 abut against each other and to allow to move the slide core (b) to its falling limit side under the condition that the recessed parts 7a and the projected parts 7b of both the slide core and the cotter engage with each other. Accordingly, the effect, which the slide cores (a) and (b) are allowed to move each other by a large stroke or the stroke represented by the depth of the tooth or of the recessed part 7a and the projected part 7b, is realized.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to a multicolor illumination lens used for a front or rear combination lamp used in a vehicle lamp such as an automobile;
This invention relates to a new mold for integrally molding lenses with different performance and other types of lenses.

[Conventional technology]

By the way, as shown in FIGS. 4(a) and 4(b), for example, as shown in FIGS. 4(a) and 4(b), as a lens of a so-called combination lamp having a lighting device for a vehicle such as an automobile, in particular, a multicolored illumination lens, a part of the rearance lens 50 etc. has a different color or different type. Amber lenses 51 and the like are integrally constructed in a continuous or floating island shape (hereinafter referred to as "different types of lenses"). In many cases, such different types of lenses are made by forming a secondary cavity 51a for post-molding in a set of molds A and B forming a primary cavity 50a for pre-molding, as shown in FIG. A set of slide inserts forming a.

When slide inserts a and b are slid to one side (direction A in the figure), the opening on the secondary cavity 51a side of the primary cavity 50a is touched by the sliding surface of the first slide insert. Close the push-cut state, and slide the slide inserts a and b on the other side (
When moving in the direction of the mouth in the figure),
The clearance lens 50 and the like are firstly molded using a molding die that allows the secondary cavity 51a to be continuous with the amber lens 51 and the like, and then the amber lens 51 and the like are secondarily molded.

Further, the first slide insert a is positioned in contact with the slope of the inclined block 52 disposed at the rear end, and is always pressed toward the rear end by a spring 53, and the other slide inserts are It has a structure in which the position is determined by a cylinder 54 placed at the end. This slide insert is in a straight line with the slide insert a, and a part of it is inserted into the mold A side, and during blow molding, its sliding surface forms the primary The cavity 50a is closed and obtained.

[Problem that the invention seeks to solve]

However, according to the above conventional molding die, the slide insert a
, b has a structure in which the injection pressure applied to the secondary cavity 51a during secondary molding is received by the cylinder 54, so depending on the pressure resistance of the cylinder 54, molding is performed in the secondary cavity 51a formed by the slide inserts a and b. There is a drawback that the possible product area is limited, and if the number of cylinders is increased to compensate for this, the mold structure becomes complicated.

The present invention was devised in view of the above-mentioned problem, and a slide insert is formed by arranging and configuring a connector that engages with the rear end of one slide insert at the rear end of the slide insert. By separating the image receiving structure of the slide insert for the injection pressure applied inside the cavity and the drive structure of the slide insert itself, we eliminate restrictions on the size and shape of the cavity structure on the slide insert side, and also reduce the amount of money required for this. The purpose of this project is to propose a tool for different types of lenses - chemical molding molds that can reduce the number of molds and cylinders to the minimum necessary to reduce work man-hours and unmanned and automated molding work. .

[Means for solving problems]

Therefore, in the dissimilar lens-forming mold cotter according to the present invention, a cavity is formed in the guide hole formed in the U-shaped mold, which is continuous with the cavity formed by the set of molds. A cylinder for positioning each slide insert is placed opposite to the rear end side of each slide insert, and a plurality of independent slide inserts are sequentially housed in each of the cavities. Different types of lenses are integrally molded by injecting different molten resin materials from an injection mechanism - In a chemical molding mold, a slide insert is slid against the rear end of one slide insert from a direction perpendicular to its sliding axis. The first slide insert, which advances and retreats and moves to one side or the other within the guide hole, is arranged so as to be able to lock at a predetermined portion within the guide hole, and the first slide insert and its rear end A measure is taken to form concave and convex portions that engage with each other on the sliding surface portion of the cotter that is slidably engaged with the rotor.

[Effect]

According to the above configuration, when different types of lenses are integrally molded, the injection pressure applied to the cavity formed by the slide insert can be stopped by the cotter, so that the injection pressure applied to the cavity formed by the slide insert can be stopped, so that the injection pressure applied to the cavity can be stopped regardless of the size or number of cylinders. The shape and size can be freely designed, and the function of the drive source for the slide insert and the injection pressure receiver in the cavity formed by the slide insert are separated, making it possible to use a small cylinder. In addition to reducing work man-hours and increasing work efficiency, it not only contributes to molding and other cost savings, but also reduces the time interval between blow molding work and secondary molding work. It is possible to integrally mold different types of lenses with improved joint precision.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dissimilar lens-forming mold molding tool according to the present invention will be described below with reference to the drawings.

The present invention prevents the injection pressure applied to the cavity formed by the slide insert in a mold in which a slide insert is configured for simultaneously forming the secondary molded product 1 and the secondary molded product 2. FIGS. 1 to 3 show an embodiment of a mold in which a floating island-like lens portion is secondarily molded by post-molding within a main lens portion that is primarily molded by pre-molding.

That is, a set of molds A for forming a cavity 1a for molding the main lens, which is the primary molded product 1 by pre-casting,
A guide hole 3 that is in contact with one side of the cavity 1a and straddles both molds A and B is connected in B, and a floating island-shaped lens part that is a secondary molded product 2 by post-molding is inserted into the guide hole 3. A pair of slide inserts a and b forming a cavity 2a for the purpose of the present invention is slidably accommodated. i.e. - a cavity 1 for the next molded product 1;
An example of a is opened in contact with the inside of the guide hole 3, and the opening is opened and closed by the sliding surface of the slide insert. Furthermore, the slide inserts a and b are slid by the driving force of cylinders 4 and 5 placed opposite to each other at their respective rear ends, and hydraulic or pneumatic pressure can be selectively supplied to the cylinders 4 and 5. Accordingly, each rod 4
The slide inserts a and b can be slid within the guide hole 3 between the upper limit and the lower limit via the slide inserts a and 5a, respectively. In the present invention, the rear end side of the slide insert is provided with a sliding movement that is perpendicular to the sliding direction of the slide insert, and the rear end side of the slide insert is slidable in a direction perpendicular to the sliding axis of the slide insert. The cotter 6 is arranged so that when injection pressure is applied by the injection mechanism to the cavity 2a formed by the slide inserts a and b, the slide inserts are disposed. movement in the downward limit direction, and several teeth or uneven portions 7a and 7b that engage with each other are formed on each engagement surface where the two contact each other, and the protrusions 7 of both
The slide insert is supported on the upper limit side with the b's in contact with each other, and the slide insert is allowed to move toward the lower limit with the unevenness 7a and 7b of both engaging with each other. It has become. Therefore, there is an effect that a large stroke of the slide inserts a and b can be tolerated with a small stroke of the cotter, that is, a stroke corresponding to the thickness of the teeth or the unevenness 7a and 7b. Then, move the cotter in the direction of arrow A using the cylinder 8, and slide the cotter into the holder 6.
When the slide insert is moved to the lower limit side (in the direction of the arrow) while interlocking the uneven parts 7a and 7b formed on the sliding surface of the molds A and B for the next molded product 1, The cavity 1a formed by the slide insert a is closed by the sliding surface of the slide insert a.

After moving b in the upward limit direction (in the convex direction of the arrow) using each cylinder 4 and 5, move Cottaro to cylinder 8.
When the slide inserts are moved in opposite directions (two directions of arrows) by the driving force of , and the protrusions 7b are brought into contact with each other and the slide inserts are locked at the upper limit side, the slide inserts a and b form the cavity 2a side. and the cavity 2a side formed by the molds A and B that accommodate the slide inserts a and b can be continuous. Therefore, the cylinders 4 and 5 simply serve as driving sources for the slide inserts a and b, respectively, and there is no need to stop receiving the injection pressure applied to the cavity 2a formed by the slide inserts a and b. It can be made smaller than conventional cylinders, and the mold structure can be simplified. In addition, since the injection pressure applied to the inside of the cavity 2a is completely stopped by the cottaro, the cavity 2a formed by the slide inserts a and b,
That is, there is no restriction on the size or shape of the product area molded by the cavity 2a, and the freedom of design is improved.

Therefore, when molding a different type of lens, first, with the slide inserts a and b moved to the lower limit side, the cavity 2a is made independent from the cavity 1a on the side of the molds A and B (see Fig. 1). After injecting the molten resin material into the cavity 2a side by one injection mechanism and molding the primary molded product 1 that will become, for example, the main lens part, slide inserts a and b are moved to the upper limit side, and the mold A, The slide insert a and the cavity 2a on the b side are connected to the primary molded product 1 molded in the cavity la on the B side (see Fig. 2), and - a different molten resin material from the next molded product 1 is injected into the primary molded product 1. What is necessary is to inject it by a mechanism and mold the secondary molded product 2, which becomes, for example, a floating island-shaped lens portion. Therefore, there is no need to separate molds A and B or use other molds after molding the next molded product 1, and there is no need to separate molds A and B or use other molds after molding the next molded product 1. Figure 4 (a) and (
It becomes possible to simultaneously mold a primary molded product 1 and a secondary molded product 2 integrally continuous therewith as shown in 0), and the molding work time can be significantly shortened. In addition, this shortened time makes it possible to control the molding time from primary molding to secondary molding. Therefore, it is possible to improve the accuracy of the joint between the secondary molded product 1 and the secondary molded product 2.

In addition, in the above embodiment, the slide insert a.

Although the structure in which the floating island-like lens portion is post-molded using b is explained, it is natural that the slide inserts a and b can be modified to enable pre-molding without changing the mold structure, and it is also possible to make the floating island lens part pre-molded. It is also possible to integrally mold lenses for combination lamps in which lenses are continuously formed.

[Effects of the Invention] Since the dissimilar lens-forming mold cotter according to the present invention is constructed as described above, the size and shape of the cavity formed by the slide insert can be freely designed. It is possible to integrally mold a floating island lens part, etc. of a desired shape and size within the main lens part, and it is also possible to reduce the number of man-hours required for molding multicolor illumination lenses and other different types of lenses. Enables multicolor laminated molding and assembly of parts. In addition, since the number of molds required for molding can be significantly reduced, it will contribute to reducing the cost of multicolor lighting lenses and other different types of lenses used in combination lamps, etc., and the molding work will be automated and unmanned. It has excellent effects such as the ability to

[Brief explanation of the drawing]

FIG. 1 shows the schematic structure of a molding die constituting a dissimilar lens-chemical molding mold cotter according to the present invention.
A) is a front sectional view of the slide insert moved to the lower limit side, (U) is a sectional view of the same side, and Figure 2 (A) is a front sectional view of the slide insert moved to the upper limit side. Front sectional view, (o
) is a sectional view of the same side, Fig. 3 is an enlarged front sectional view of a part of the kotsuta, Fig. 4 (a) and (0) are perspective views of products molded using the conventional molding method, and Fig. 5 is a sectional view of the product molded using the conventional molding method. The structure of the mold is shown in which (a) is a front cross-sectional view during blow molding, and (b) is a front cross-sectional view during secondary molding. A, B...Mold a, b...Slide insert l...-Next molded product 2...Secondary molded product Ia.
...Cavity 2a...Caviday 3...Guide hole 4,5.8...Cylinder 6...Cottater patent applicant Koito Seisakusho Co., Ltd. Representative Patent attorney 1) Kazuo A, B.
...Mold a, b...Slide insert 1...-Next molded product 2...Secondary molded product 1a...Cavity 2a...Cavity 3...Guide hole 4.5. Death...Cylinder 6...Cotter Fig. 3 Fig. 4 a) 5゜Fig. 5

Claims (2)

[Claims] (1) A set of slide inserts forming a cavity continuous to a cavity formed by the set of molds is slidably accommodated in a guide hole formed in a set of molds, and each A cylinder for positioning the slide inserts is placed opposite to the rear end side of each slide insert, and different molten resin materials are sequentially injected into each of the cavities from a plurality of independent injection mechanisms to integrate a plurality of different types of lenses. In the mold for integrally molding dissimilar lenses, the above-mentioned one slides forward and backward from the rear end of one slide insert in a direction perpendicular to its sliding axis and moves to one side or the other side in the guide hole. A cotter for a mold for integrally molding different types of lenses, the slide insert being arranged so as to be able to lock in a predetermined position within a guide hole. (2) forming uneven parts that engage with each other on the sliding surface of the cotter that slides back and forth with respect to the first slide insert and the rear end;
When one slide insert moves to one side of the guide hole, the convex parts engage with each other, and when one slide insert moves to the other side of the guide hole, the uneven parts of both engage with each other. The cotter for a mold for integrally molding dissimilar lenses according to claim 1, characterized in that the cotters are configured to mesh with each other.