JPH0479813B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a novel integration of multicolor lighting lenses, lenses with different performance, and other lenses of different types used in front or rear combination lamps used in vehicle lighting equipment such as automobiles. The present invention relates to a molding method and a mold used therefor.

[Conventional technology]

In a lighting device for a vehicle such as an automobile, particularly in a so-called combination lamp having a multicolor illumination lens, a plurality of different color lenses constituting the multicolor illumination lens are integrally constructed, and the rear surface of each lens is provided with a required lens step. is used. As such a multicolor illumination lens, when a different color amber lens 51 is integrated into one side or a part of the clearance lens 50 in the form of a floating island as shown in FIGS. 7A and 7B, first, the floating island portion is transparent. The clearance lens 50 installed 50a and the amber lens 51 to be attached to the floating island portion may be molded separately, and both may be made into an integrated product by ultrasonic welding or the like in a later process, or the amber lens 51 may be molded first. This is then inserted into predetermined parts of the molds A and B during molding of the clearance lens 50 and molded integrally into a product.

Also, recently, as shown in Figure 7C, first 1
Alternatively, two or more primary molded products 50 are first cast in molds A and B having cavities a for each, and then mold A is separated from mold B, leaving the primary molded product 50 on mold B. The land of the mold C is aligned with this, and a cavity b for the secondary molded product 51 is continuously formed on the side thereof, and the primary molded product 50 is
A method is used in which the secondary molded product 51 is integrally molded before it cools down.

[Problem that the invention seeks to solve]

However, according to methods A and B above, molding work is required for each different type of lens, and therefore not only is a dedicated mold for molding each lens required, but especially regarding A, the process will be explained later. As a process, the primary molded product 50 and the secondary molded product 51 are joined together at the joining edge 5 of the two.
It is necessary to weld the entire circumference of parts 0a and 51a, which requires extra effort and time, and there is also the problem that the welded part α is visible from the surface side after welding, resulting in poor appearance. It was hot.

In addition, in method C, during secondary molding,
In order to prevent mold misalignment of the primary molded product 50 that occurs when fitting the land of the mold C onto the mold B, the secondary molding side end of the primary molded product 50 is placed between the molds B and C.
A clamping edge 50b is formed in advance at this portion, and a joining edge 50a for joining the primary molded product 50 and the secondary molded product 51 is connected to the clamping edge 50b to hold the primary molded product. A joint edge 51a is molded on the end face of the secondary molded product 50 and is joined to the joint edge 50a on the primary molded product 50 side on the secondary molded product 51 side.
need to be formed. Therefore, the joining edges 50a, 51a and the pinching edge 50 that become this binding margin γ
Regarding the part b, it is not possible to form a lens step or the like on the rear surface, and the sense of unity between the primary molded product 50 and the secondary molded product 51 is lost in terms of design. The thickness, that is, the thickness α of the joint edges 50a, 51a of the joint edges 50 and 51 and the molded length β of the sandwiching edge 50 portion are visible, which impairs the appearance toward the lens surface side, and the height of the joint edges 50a, 51b. In order for the thickness δ to be completely bonded, it would be necessary to be several times the basic thickness of the lens, which caused a problem in terms of product construction.

The present invention was devised in view of the above problems, and when integrally molding polychromatic illumination lenses, lenses with different performances having different lens step shapes, and other different types of lenses (hereinafter referred to as "different types of lenses"),
In addition to molding the floating island-shaped lens part into the main lens part by pre-casting, the number of molds required for this is reduced, reducing the number of work steps, and the molding work can be unmanned and automated. The purpose of this study is to propose a method and a mold for use in the method.

[Means for solving problems]

Therefore, the method for integrally molding different types of lenses according to the present invention allows the insert that forms the cavity for the primary molded product to slide freely within a set of molds that forms the cavity for the secondary molded product. The gist of this method is to integrally and continuously mold a primary molded product and a secondary molded product using a molding mold that is housed in a molding structure. After the floating island-shaped lens part is primarily molded using a pair of slide inserts that form cavities for pre-casting that are slidably accommodated in corresponding molds, the slide inserts are slid to form the first molding. A method was taken in which the floating island-shaped lens part, which is a molded product, was connected to the cavity for post-molding, and a resin different from the resin for primary molding was injected into the cavity to secondary mold the main lens part. It is something.

In addition, during this molding, it is also possible to mold multicolor lighting lenses using different colored materials as the materials for the primary molded product and secondary molded product, or to mold different performance lenses formed with different lens step shapes. be.

[Effect]

According to the above configuration, when integrally molding different types of lenses, it is not only possible to integrally mold the floating island lens part, which is a primary molded product, within the main lens part, which is a secondary molded product, but also makes it possible to reduce the molding process. In order to reduce the number of man-hours and increase work efficiency, contribute to the reduction of costs in the mold and other areas, and reduce the time interval between primary molding work and secondary molding work, we have developed a floating island-shaped lens part that is a primary molded product. The accuracy of the joining part of the main lens part, which is a secondary molded product, is improved, and since there is no need for a binding margin between the two parts, it becomes possible to integrally mold different types of lenses with an excellent sense of unity.

[Example] Hereinafter, an example regarding the method for integrally molding different types of lenses according to the present invention and a mold for molding used therein will be described with reference to the drawings.

The present invention relates to a method for simultaneously and integrally molding a floating island-like lens portion, which is a primary molded product 1, into a main lens portion, which is a secondary molded product 2, and uses a molding die shown in FIGS. 1 and 2. This will be implemented by That is, in a set of molds A and B forming a cavity 2a for molding a main lens which is a secondary molded product 2 by post-molding, a mold is placed in contact with one side of the cavity 1a, and in both molds A and B. The straddling guide holes 3 are connected, and a pair of slide inserts a and b forming a cavity 1a for a floating island-shaped lens portion, which is the primary molded product 1, is slidably accommodated in the guide holes 3. . That is, one side of the cavity 2a for the secondary molded product 2 is open 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 b. ing. In addition, the above slide inserts a and b
The piston rods 4a and 4 are slid by the driving force of cylinders 4 and 5 that are opposed to each other in the sliding direction.By selectively supplying hydraulic pressure or pneumatic pressure to the cylinders 4 and 5, the respective piston rods 4a and 4a, 5
The slide inserts a and b can be slid within the guide hole 3 between the upper limit and the lower limit, respectively, via the slide inserts a and b. In addition, in this embodiment, the lower side of the slide insert b is provided with a cotter that is perpendicular to the sliding direction of the slide insert b and that slides toward the lower surface of the slide insert b and engages with it in a wedge shape. 6 is placed. The slider 6 stops the slide insert b from moving in the downward limit direction when injection pressure is applied to the inside of the cabinet 1a, and there are several plates that engage with each other on each engagement surface where they come into contact. Each tooth or uneven portion 7a, 7
b, and the slide insert b is supported on the upper limit side with the convex portions 7b of both abutting each other,
With the projections and recesses 7a and 7b of the two members interlocking with each other, the slide insert b can be allowed to move toward the lower limit side. Therefore, there is an effect that a small stroke of the slider 6, that is, a stroke corresponding to the thickness of the teeth or unevenness 7a, 7b, can permit a large stroke of the slide inserts a, b. Then,
Slide inserts a and b are attached to cylinders 4 and 5, respectively.
After moving in the upward limit direction (direction of arrow A), the slider 6 is moved in a predetermined direction (direction of arrow B) by the driving force of the cylinder 8, and the protrusions 7b are brought into contact with each other to raise the slide insert b. When locked on the end side, the cavity 2a formed by the molds A and B for the secondary molded product 2 is closed by the sliding surface of the slide insert b, and conversely, the cavity 2a formed by the molds A and B for the secondary molded product 2 is closed by the sliding surface of the slide insert b. direction of arrow C), and the uneven portions 7a, 7
When the slide inserts a and b are moved in the lower limit direction (arrow 2 direction) while engaging the slide inserts b, the cavity 1a side formed by the slide inserts a and b and the metal housing that accommodates the slide inserts a and b are moved. The cavity 2a formed by molds A and B can be continuous.

Therefore, when molding a different type of lens, first move the slide inserts a and b to the upper limit side, and move the molds A and B from cavity 1a to cavity 2.
After molding a primary molded product 1 that will become a floating island lens portion by injecting molten resin material using one injection mechanism (see Fig. 1), slide inserts a and b are made independent.
is moved to the lower limit side, the cavities 2a on the mold A and B sides are connected to the primary molded product 1 molded in the cavity 1a (see Fig. 2), and a resin melt material different from that of the primary molded product 1 is applied. The secondary molded product 2 that will become the main lens portion may be molded by injection using another injection mechanism. Therefore, there is no need to separate molds A and B or use other molds after molding the primary molded product 1, and it is not necessary to separate the molds A and B or use other molds. Slide inserts a, b
As shown in FIG. 3, by only the sliding movement, it is possible to simultaneously mold the primary molded product 1 and the secondary molded product 2 that is integrally continuous with the primary molded product 1, 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, and it is possible to inject the molten resin material for secondary molded product 2 after primary molded product 1 has been molded, before it solidifies. Therefore, primary molded product 1 and secondary molded product 2
It is possible to improve the accuracy of the joint with the Therefore, there is no longer a need for a pinching edge or a bonding edge that serves as a binding margin between the primary molded product 1 and the secondary molded product 2, which have been necessary in the past, and different types of lenses can be directly integrally molded and molded simultaneously. becomes possible. Figure 4A shows the floating island-shaped lens part during primary molding, Figure 4B shows the state in which the main lens part continuous to the floating island-shaped lens part has been secondary molded, and Figures 5 and 6 In the figure, the former shows a joint part of a multicolor illumination lens made by a conventional insert molding method, and the latter shows a joint part X of a multicolor illumination lens made by a dissimilar lens integral molding method according to the present invention, This clearly shows the significant difference in accuracy between the two.

〔Effect of the invention〕

Since the method and mold for integrally molding different types of lenses according to the present invention are constructed as described above, it is possible to integrally mold the floating island-like lens part within the main lens part, and also to mold different types of lenses such as multicolor lighting lenses. The integral molding method of the present invention can be applied to assembly work and painting work related to conventional parts manufacturing that combines multiple different types of molded products, and can be applied not only to different types of lenses but also to multicolored laminated products. Enables molding and assembly of parts. In addition, since the number of molds required for molding can be significantly reduced, it contributes to lowering the cost of multicolor lighting lenses and other different types of lenses used in combination lamps, and also aims to automate and unmanned molding work. It has excellent effects such as the ability to

[Brief explanation of the drawing]

FIG. 1 shows a schematic configuration of a molding die according to the present invention, in which A is a front sectional view with the slide insert moved to the upper limit side, B is a sectional view on the same side, and FIG. A is a front sectional view of the slide insert moved to the lower limit side, B is a sectional view of the same side, and FIG. 3 is a sectional perspective view of the main part of the product molded by the above mold.
Figure 4 A is a perspective view of the same primary molded product, B is a perspective view showing the primary molded product and the secondary molded product, and Figure 5 is an enlarged view of the main parts of the product molded by the conventional insert molding method. 6 is an enlarged sectional view of a main part of a product molded by the dissimilar lens integral molding method according to the present invention, and FIGS. 7A to 7C are explanatory diagrams of the conventional molding method. A, B...Mold, a, b...Slide insert, 1
...Primary molded product, 2...Secondary molded product, 1a...Cavity, 2a...Cavity, 3...Guide hole.

Claims (1)

[Scope of Claims] 1. Within a set of molds forming cavities for post-molding, cavities for pre-molding are respectively slidably accommodated in correspondence with the set of molds. After primary molding of the floating island-shaped lens part using a set of slide inserts, the slide inserts are slid to connect the floating island-shaped lens part to the cavity for post-molding. A method of integrally molding different types of lenses, which is characterized by injecting a resin different from the resin and performing secondary molding of the main lens part. 2. In a mold for integrally molding a plurality of different types of lenses using a plurality of independent injection mechanisms, a set of molds that forms a cavity for post-molding corresponds to the set of molds. A set of slide inserts forming a cavity for pre-molding which is continuous with the cavity for post-molding positioned by cylinders opposed to each other in the respective sliding directions is housed, and the slide inserts are arranged as appropriate. 1. A mold for integrally molding dissimilar lenses, characterized in that the two cavities are configured to be mutually continuous or closed by sliding the two cavities.