JPS5910298B2 - Manufacturing method and device for product with folded part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method and apparatus for integrally molding a product having an inwardly folded portion, such as a seat cowl for a motorcycle, using a mold.

More specifically, a plurality of slide cores are provided on the mold matching surfaces of the movable mold and the fixed mold, and when the mold is opened, the cores are moved toward each other and separated from the product having the inward folded portion. , the product can be reliably released from the mold by the pressing action of the slide pin that penetrates the slide core and protrudes relatively outward, thereby preventing the product from adhering to the slide core and releasing the product. The present invention relates to a manufacturing method and device that enable integral molding.

FIG. 5 shows a motorcycle 1, in which a seat cowl 2 is assembled on the rear upper surface of the vehicle body, a passenger seat 3 for the driver and a passenger is attached so as to cover this seat cowl 2, and Assemble seat 3 to the vehicle body.

FIG. 6 shows the detailed shape of this seat cowl 2, in which a pair of left and right extending portions 4, 4 extending in the longitudinal direction of the vehicle body are connected by an upright portion 5 at the rear. Inwardly folded portions 4a, 4a are provided at the lower edges of each of the extending portions 4, 4, thereby improving the design. These 4a and 5a are continuous, and a folded portion is formed to improve the appearance over the entire length of the lower surface of the seat cowl 2. The seat cowl 2 is molded from a synthetic resin material by injection molding, and conventionally has a folded part,
That is, a seat cowl is manufactured as a split type in consideration of the undercut portion coming out of the mold, and after molding, a plurality of split pieces are joined to obtain a product seat cowl.

FIG. 4 shows such a conventional seat cowl west manufacturing apparatus, which is equipped with a fixed mold 5 and a movable mold 7, and a pair of left and right slide cores 8, 9 are provided on the mold mating surface.
, 9 are supported by a link device 10 constituting ejector means.

The link 10a at the tip slidably passes through the movable mold 7,
The entire linkage 10 is held by a push-out plate 12 attached to the top of the knockout par 11. The substrate 13 supporting the movable mold 7 and the knockout par 11 are in a loose relationship through the guide hole 13a, and when the movable mold 7 is lowered and opened, the slide cores 8 and 9 are supported by the link device 10. and maintain a rising state. Divided pieces 2a, 2a of the seat cowl 2 are formed in cavities between the respective slide cores 8, 9 and the fixed mold 6, movable mold 7 by an injection molding device (not shown), and when the movable mold 7 is lowered, The slide cores 8, 9 move inwardly, and thus the slide cores 8, 9 are separated from the divided pieces 2a, and a pair of independent divided pieces 2a, 2a can be obtained. In the conventional apparatus as described above, the seat cowl must be formed as a plurality of divided pieces, and these pieces must be joined and combined to obtain the seat cowl, which requires a large number of work steps and time9.
There were problems in terms of workability, and there was a demand for integral molding of the seat cowl.

Particularly in the conventional manufacturing method as described above, when the molds of the fixed type and movable type are broken, the seat cowl divided pieces 2a often adhere to the slide cores 8 and 9, and the divided pieces 2a are folded. Return part 4a. 1 is not necessarily separated reliably from the slide cores 8, 9, and it is desired to solve this problem when integrally molding the seat cowl.

In view of the problems associated with such conventional manufacturing methods and devices, the present inventors have developed the present invention to effectively solve the problems, and provide a product having an inwardly folded portion such as a seat cowl. The present invention has been made so that it can be integrally molded.

The object of the present invention is to move a plurality of slide cores toward each other in accordance with the mold opening operation when a pair of molds facing each other are opened, thereby integrally molding the outer surfaces of the dislide cores. Separate each slide core from the product to be
Moreover, during this separation, an outward pressing force is applied to the product by the slide pin penetrating the slide core in the inner and outer directions, thereby preventing the product from adhering to the slide core while integrally molding the product. To provide a manufacturing method that ensures the releasability of a product. Another object of the present invention is that, in order to achieve the above manufacturing method, a movable mold is formed with an inclined surface that guides the slide cores toward each other, and one end of the slide pin is formed on the movable mold. When a movable mold is opened from a fixed mold by forming a straight guide surface that comes into contact with the mold, this straight guide surface allows the slide pin to remain in the position of the product formed on the outer surface of the slide core without changing its position relative to the product formed on the outer surface of the slide core. As the slide core moves inward along the slide core, the slide pin protrudes outward relative to the slide core, and the product adheres to the outer surface of the slide core. To provide a manufacturing device which is prevented by a pressing force.
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the following explanation, the product will be described as a seat cowl.
1 to 3 show cross-sectional views of essential parts of the manufacturing apparatus according to the present invention, and the drawings are arranged in accordance with the order of operation.

20 is a fixed type, and 21 is a movable type, and these molds 20 and 21 are vertically opposed and combined.

Slide cores 22, 2 are installed in the upper mold matching part of the movable mold 21.
3 are provided on the left and right sides, and a cavity S is formed between the outer surfaces of these slide cores 22 and 23 and the lower surface of the fixed mold 20. In particular, the cavity S is connected to each side surface and upper surface of both slide cores 22 and 23. A seat cowl 2 having a substantially inverted U-shaped cross section is integrally molded into the cavity S by an injection molding device (not shown). The upper surface of both ends of the movable mold 21 is provided with small recesses Sl and S2 that are continuous with the cavity S.
l, S2 has an inward folding part 4a of the seat cowl 2,
4a is formed. Reference numeral 24 denotes a link device constituting the ejector means. Since this link device 24 has the same structure as the device 10 shown in FIG. 4, only the main part, the tip link 24a, is shown. It is omitted in Figure 3.

A recess 26 is formed in the center of the lower surface of the fixed mold 20 and is recessed upward from the mold splitting surface 25 . By being pivotally connected to 24a with a pin 24b, it is supported so as to be swingable in the inward and outward directions of the nine cavities S.

The movable mold 21 is provided with a chevron-shaped protrusion 27 that is inserted into the recess 26.
Both side surfaces of the proximal end are formed with straight guide surfaces 28, 28 in the vertical direction, in other words, parallel to the moving direction of the movable mold 21,
Both side surfaces of the tip are tapered guide surfaces 29, 29 in the shape of a tapered zigzag. The outer surfaces of the small protrusions 27b and 27c are sloped surfaces 30 and 30 that approach each other as they go upward, and in particular, the sloped surfaces 3
0 and 30 are made parallel to the tenor inner surfaces 29 and 29 of the large protrusion 27a. Inner surface 22a of each slide core 22, 23
, 23a are brought into slidable contact with the inclined surface 30, and the two upper inner surfaces 22b, 23b are brought into contact with the tapered guide surface 29. Also, each slide core 22923 has a slide pin 3.
1 is slidably inserted in the inward and outward directions, and the enlarged inner end portion 31a of this 31 is inserted into the recessed portion 32 of the small protrusions 27b, 27c and abuts against the straight guide surface 28 of the large protrusion 27a. A slide pin 31 is installed inside the slide cores 22 and 23.
A chamber 33 that accommodates the flange portion 31b integrally formed with the VC
This chamber 33 is closed with a stopper 34, and the spring spring 35 is compressed.
An outward resilient force is applied to the disislide pin 31.
Next, we will discuss the effect.

By combining the fixed mold 20 and the movable mold 21, the slide core 22,
Seat cowl 2 is attached to the cavity S formed on the outer surface of 23.
are integrally molded.

When the movable mold 21 is lowered to open the mold, the slide cores 22 and 23 are supported by a ring device 24 that maintains their position relative to the movable mold 21.
Despite the downward movement, the movable mold 21 and the slide cores 22 and 23 continue to be in the raised position, so that relative movement occurs in the vertical direction between the movable mold 21 and the slide cores 22 and 23. As the movable die 21 descends, the slide cores 22 and 23 slide along the tapered guide surface 29 and the inclined surface 30, and as they move away from the movable die 21, the pair of left and right slide cores 22 and 23 adjust the inclination angle of the inclined surface 30. The slide cores 22 and 23, whose outer circumferential surfaces are integrally molded with the seat cowl 2, move in the direction of separating from the seat cowl 2. This state is shown in FIG. In this case, while the movable mold 21 descends by a certain stroke, the end 31a of the slide pin 31 continues to be in contact with the straight guide surface 28, so the slide pin 31
The slide pin 31 does not change its position in the inner and outer directions with respect to the seat cowl 2, and as the slide cores 22 and 23 move toward each other, the slide pin 31 moves outward from the slide cores 22 and 23. protrude in one direction.

Therefore, an outward pressing force is applied to the inner surface of the seat cowl 2 by the slide pin 31, and when the slide cores 22 and 23 move inward to the seat cowl 2, the seat cowl 2
The seat cowl 2, which is a product, is prevented from adhering to the outer surface of the slide cores 22 and 23 by the slide pin 31.
is pushed out toward the fixed mold 20 side. In this way, good mold releasability of the seat cowl 2, which falls apart when the molds of the fixed mold 20 and the movable mold 21 are opened, is ensured, and even if the inward folding part 4a is provided, it is not affected by this 4a. Slide core 2
The seat cowl 2 can be separated from the seats 2 and 23. The outward protrusion of the slide pin 31 caused by the movement of the slide cores 22 and 23 toward each other continues until the end 31a of the slide pin 31 moves from the straight guide surface 28 to the inner surface 29 of the groove. , when the movable die 21 further descends and the slide pin 31 comes into contact with the tapered guide surface 29, the slide pin 31 moves into the slide cores 22, 23.
The slide pin 31 moves inward of the seat cowl 2 together with the slide pin 31, thereby releasing the pressing force on the seat cowl 2 by the slide pin 31.

This is the state shown in FIG. The sheet cowl 2 cut out in this way is peeled off from the fixed mold 20 to obtain an integrally molded product, and then, when the movable mold 21 is raised, the slide cores 22 and 23 are moved along the inclined surface 30 to the original position. The slide pin 31 is expanded to the position , and the slide pin 31 returns along the tapered guide surface 29 and the straight guide surface 28, so that the next molding process can be performed.

In the drawing, there are two slide cores 22 and 23 on the left and right.
However, in consideration of the rear upright portion 5 of the seat cowl 2 shown in FIG. If the bending direction is substantially the same as the bending direction of the turned portion 5a, it is possible to integrally mold a seat cowl having a V-turned portion over the entire length of the lower surface.

Further, in the above embodiments, the product was described as a seat cowl for a motorcycle, but the present invention can be applied to any product having an inwardly folded portion.

As is clear from the above description, according to the present invention, a plurality of slide cores whose outer surfaces are integrally molded are moved in a direction toward each other, and during this movement, slide pins that protrude relatively outward are used. Since the product is pressed outward by applying pressure to the product, the product comes out without adhering to the slide core, and good mold release properties are obtained. This folded part can be reliably peeled from the mold, and the conventional split type can be molded in one piece, improving workability, saving labor, and improving the mold releasability of the product. can. Further, according to the present invention, it is only necessary to form an inclined surface on which the slide core slides on the movable mold, and a straight guide surface on which one end of the slide pin abuts.
Due to the external shape of the movable mold, it is possible to perform various operations such as moving the plurality of slide cores in a direction toward each other and causing the slide pins to relatively protrude outward as a result of this movement, It has various features such as not requiring any complicated mechanism, and can be expected to operate smoothly and reliably.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the main parts of the device according to the present invention, and FIGS. 2 and 3 are similar to FIG. 1, showing the order of mold opening operation. Figure 4 is a sectional view showing a conventional device, Figure 5 is a diagram of a motorcycle in which a seat cowl is used as an example of the product, Figure 6 is a detailed view of the seat cowl, and Figure 7 is a cross-sectional view of a conventional device. 7-7f1IIr in Figure 6
It is a T-side view.

Claims (1)

[Scope of Claims] 1. A plurality of slide cores for integrally molding an inward folding portion on a product are provided between a pair of fixed mold and movable mold mating portions that can be freely separated and combined, and the slide core and molding the inward folded part integrally with the product between one mold, and simultaneously opening the pair of molds and moving the plurality of slide cores inwardly away from the folded part of the product. the folded part characterized in that the guide pin is projected outwardly relative to each slide core during this movement, and the outward pressing force of the slide pin is applied to the folded part of the product. A method of manufacturing a product that has 2. A pair of fixed and movable molds that can be separated and combined, and a plurality of slide cores that are provided between the mating parts of the pair of molds and for integrally molding the inward folding part of the product;
It consists of a plurality of slide pins that are inserted into each of these slide cores so as to be slidable in the inner and outer directions and apply a pressing force to the folded part of the product, and are inclined with respect to the mold opening direction of the movable mold, and an inclined surface that slides and guides each of the plurality of slide cores and moves each slide core inwardly from the folded part integrally molded with the product when the mold is opened; and parallel to the mold opening direction of the movable mold; Manufacture of a product having a folded part, characterized in that the movable mold is provided with a straight guide surface that slides and guides each of the plurality of slide pins and presses each slide pin against the folded part of the product when the mold is opened. Device.