JPS59127744A - Molding apparatus for sealing member of automobile - Google Patents

Abstract

PURPOSE:To simplify a molding apparatus for a U-shaped sealing member preventing bias and torsion of material by a method wherein a rubber belt as a strip material is sunk flat into a shallow groove of a guide member and after a part existing thereabove is received with a recessed groove on the circumference of a female die wheel, molded into a U shape while a molding section is contained with a protruded stripe on the circumference of a male die. CONSTITUTION:A material guide member 8 is arranged along the circumference of a female die 5 and a material rubber belt A is molded into a U shape with both rims thereof with a protruded stripe 6a of a male die 6 through both rims of a recessed groove 5a on the circumference of the female die wheel 5 and a guide groove 7. In the first half of the molding, the material A is bent upward and then, done in the opposite direction in the second half of thereof thereby enabling U-shaped molding without use of a multi-stage molding roll.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding a sealing material for an automobile or a similar sealing material.

Automotive sealing materials usually consist of a tubular, flexible sealing rubber,
It consists of a U-shaped rubber band with a flat steel core inserted.

Its cross-sectional shape varies, but its two sides are shown in Figure 1.2. The / is the seal rubber, and the / is the rubber band. Note that the term "rubber" here is a general term for elastic materials that can be used as sealing materials, including resins.

Before the rubber band is formed into a U shape, it is in the shape of a flat band as shown by the chain line C' in Fig. 1.2, and the forming apparatus of the present invention forms this into a U shape. This rubber band has a built-in core 3 made of a punched thin steel plate as shown in FIG. When it is U-shaped, there are two fins lined up on the inside of the surface, in this example,
It is designed to hold a guard body in its mouth. Both have well-known structures.

It may seem easy to form the unmolded rubber band C' in FIGS. 3 and 4 into a U-shape like the rubber band Y indicated by the solid line, but it is not easy. Since the cross-sectional shape of a long strip is changed, it is continuously shaped using male and female forming rollers, but as it progresses, the strip tends to twist left and right.

For this reason, the currently available molding method first involves moving the material up and down,
After passing through a guide device with no left and right play, the U-forming is completed by passing it through a forming path lined up with several rows of upper and lower rollers, each of which has a higher degree of curvature, one after the other, and in some cases about the middle row. Since the above-mentioned guide device is also installed between each stage of the upper and lower rollers, not only is the equipment complicated and expensive, but it also requires preparation work to adapt all equipment to the new material each time the material changes, making it difficult to change specifications. It was extremely troublesome to deal with.

The present invention solves the difficult U-shaped sealing material for automobiles with just one pair of male and female type wheels.

An embodiment of this invention device is shown in FIGS. 4 and 5.

Its main parts are a female wheel with a groove α on its outer periphery, a male wheel 6 that rotates in the opposite direction by inserting a protrusion A (Z) on the outer periphery into the groove Sα of the female wheel S, And, it is the king of guide materials g having a shallow guide groove 7 curved along the outer periphery of the female wheel.

The strip material A is fed by the conveying guide plate wa and the receiving roller /θ on the right side of FIGS. 4 and 5, and enters the guide groove 7 of the guide material g-, which is unique to this invention. In this embodiment, in order to accommodate changes in the dimensions of the material, the guide vrg is divided into two halves on both sides, and each side is moved separately using the respective knobs, // and // to adjust the groove width and the relationship of the guide groove 7 to the female button. Allows you to change position.

The guide groove 7 has a cross section as shown in an enlarged view in FIG. The reason there is a slightly low spot on the inside is to accommodate the fins. In theory, the width of the groove should be adjusted to match the width of the rubber band material and to ensure smooth guidance.

Material A advances by sinking its rubber band unit flat into the guide groove 7,
Eventually, right below the female wheel 5, as shown in FIGS. 6, 7b, and 8b, both edges of the rubber band λ are connected to both edges 5b of the female wheel concave groove Sα.
It is lightly pressed.

Thereafter, the rubber band sandwiched between the groove α and the female button is prevented from irregular movement until it reaches the end of the guide member g.

The sealing rubber l which has come out onto the rubber band is generally received in a soaked form by the groove α as shown in Figs. 7b and 8b. However, depending on the connection position and shape of the seal rubber l and the rubber band unit, a part of the seal rubber l may form a groove α.
In some cases, the guide groove may protrude from the groove and proceed while being caught between the concave groove edge 5b and the guide groove. In such a case, the corresponding position of the guide groove may be made a little deeper if necessary.

In Fig. 9, the rubber band 2 of material A (sealing rubber/is omitted because the diagram is difficult to understand) that has been pulled out from the guide material g is attached to the female button by the outer periphery protrusion O of the male button. It shows how the central part is pushed into the groove α. The XX cross section in Figure 9 is 7c.
8c. The former is the sealing material shown in FIG. 1, and the latter is the sealing material shown in FIG. 2, which is in the process of being molded. Although the central part is formed into a chevron shape, both edges are still flat and restraint by the material A in the rear guide groove 7 is effective.

In addition, since the seal rubber / protruding from the rubber band is flexible, even if the material has a cross section as shown in Figures 7α and 8α, when it is pushed into the six grooves Sα of the female car y, It can transform freely and return to its original shape if it separates.

In this embodiment, only the male type button B is driven by the motor 2, and the female type button is driven by this via the material A. The male model car O is pulling the molded material A. both buttons,
From the meshing position of A, the material A covers the protrusion O of the male wheel O and rotates together (Fig. 7d), and is pulled out to the left in Fig. 4.5 by a pulling device (not shown). Then, the material A rides on the stripping spatula /3 that sandwiches the protrusion 6α of the male type roller O, leaves the protrusion Otsu α, and heads for the next sizing roller /4'. Note that in FIG. 4, spatula/3 is omitted.

The sizing roller/lI has traditionally been used to finish the material that has passed through the forming rollers at each stage, and it adjusts the dimensions of the U-shaped part as shown in Figures 7e and 8d.
, the sealing material has a required cross section as shown in FIG. 8e.

Note that this embodiment allows sealing materials of various sizes and shapes to be molded with simple adjustment.

That is, in FIGS. 4 and 5, the aforementioned knob for changing the width and position of the guide groove 7 of the guide member g.

The knobs /3 and /& are screw drives for the material feeding guide plates wa and 9, respectively. Also, the knob attached to the base of the male type AAA / O is a threaded rod / Lα via the bevel gear.
The base of the female type car S can be moved toward or away from the male type AAA by turning the . You can adjust the brightness. The sizing roller /4' can also be adjusted using knobs /7 and /7.

The length of the curved guide groove 7 of the guide material g along the outer periphery of the female button, which is an important requirement of this invention, is the length of the curved guide groove 7 along the outer periphery of the female button when the U is formed.
It is safer to make it as long as possible, rather than making it too short, as it creates a restraining force that prevents deviation and twisting. However, in experiments, it was found that an angle of about 60 degrees, which is approximately -60 degrees around the outer periphery of the female car, was sufficient and effective against ordinary sealing materials.

However, the degree of difficulty changes depending on the shape of the sealing material, such that the sealing material shown in FIG. 8e is more likely to cause deviation than the sealing material shown in FIG. 7f. Therefore, it may be desirable to restrain both edges of the rubber band 2 during molding as shown in FIGS. 7c and 8c at the molding position, rather than at the rear. If the guide groove 7 is divided into both sides as in the above embodiment, it can be extended to the tip of the guide groove or to the position where forming is being performed, as shown by the guide member g' shown by the chain line in FIG.

On the other hand, there are many cases where the guide material g can be shortened, as shown by the chain line guide material g.

Although the present invention has been described above with reference to a small number of embodiments, the embodiments of the present invention can be varied and applied in a variety of ways depending on the design conditions and using the well-known techniques of mechanical designers.

In this invention, a material guide material is placed along the outer periphery of the female mold car, and both edges of the material rubber band are restrained by the concave grooves on the outer periphery of the female mold car and the guide grooves immediately before U-forming, and if necessary, during molding. In addition, the U-formation is completed at once between the female and male molds of the set, but the material is curved upward in the first half of molding, and curved in the opposite direction in the second half of molding. Conventionally, a molding device for automotive sealing material, which could not be formed into a U-shape without the use of multi-stage molding rollers, has been dramatically simplified.

Although it is difficult to explain the reason for the success theoretically, one possibility is that the material was fed in a curved manner, and by restraining the nine curved parts, the material was prevented from becoming skewed or twisted at the subsequent forming position. In addition, as can be inferred from Figure 9, in the first half of molding, the central part of the rubber band is Curved upward to facilitate mountain-shaped protrusions,
It is thought that the combination of these two effects brought about this success, as the bending in the reverse direction in the latter half of the molding completely eliminated the need for the edges of the material to stretch due to this curvature.

With this invention, the method of forming irregularly shaped sealing materials for automobiles can be completed by using the male and female type car of Nu-gumi, which not only simplifies the equipment, but also allows the molding rollers of each stage to be changed every time the specifications of the sealing material are changed. This greatly simplifies the adjustment and replacement of the guide mechanism between them, making it possible to dramatically increase overall productivity.

[Brief explanation of drawings]

Figures 1 and 2 are typical cross-sectional views of two sides of an automotive sealing material.
Figure 3 is a plan view of an example of the copper core of the sealing material rubber band, and Figures 4 and 5 are
The figures are a plan view and an elevation view of one embodiment of this invention, FIG.
I 7e I 71 is an explanatory diagram showing changes in cross-sectional shape in the order of the sealing material molding process, No. 8α. 8b, 8c, 8d, and 8g are similar explanatory views of sealing materials of other shapes, and FIG. 9 is a cross-sectional view for explaining the state of material molding between female and male type vehicles. ri...female car, ot...male car, g...guidance material. Fig. 8(d) Fig. 7(f) 8th IQ(c) Fig. 8(e) 1(罎hi2

Claims (1)

[Scope of Claims] A device for forming a rubber band made of a band-shaped material into a U-shape consisting of a tubular flexible sealing rubber and a flat rubber band with a steel core, comprising: a female wheel having a concave groove on the outer periphery; a male wheel that rotates in the opposite direction by inserting a protrusion on its outer periphery into the concave groove of the female wheel; and a guide member having a shallow guide groove curved along the outer periphery of the female wheel; Flatten the rubber band that matches the groove width into the guide groove,
The entire or most part of the above-mentioned seal rubber that came out on top was received in the female car groove, and the rubber band was formed into a U-shape between the two mold cars while suppressing floating of both edges of the rubber band by the groove edges. A molding device for a sealing material for an automobile, characterized in that a rubber band extends over the outer circumferential protrusion of the male car.