JPS59188421A - Apparatus of bending process for extrudate with core metal inside - Google Patents

Abstract

PURPOSE:To shorten the production line for a W/S (an extrudate with a core metal) and to improve the productivity, by arranging pairs of rolls in a zigzag manner, each pair including a convex roll and a concave roll, the convex roll being for supporting a core metal outwardly toward the bending direction of the core metal, and the concave roll being for restricting the core metal from the outside to attain a bending angle at each stage. CONSTITUTION:A bending apparatus 14 includes a plurality of pairs of bending rolls 7A-7D that are arranged in a zigzag manner. The bending angle alpha of the zigzag is generally 30-140 deg.. The bending apparatus 14 is situated immediately after a vulcanizing tank 11 without arranging a take-up and a core metal separating apparatus. The core metal 2 embedded in a gripping section 3 of the vulcanized W/S that has been extruded from an extruder 12 is passed between the pairs of the bending rolls 7A-7D and bent into a prescribed U-shape, and since the pairs of the bending rolls 7A-7D are arranged in a zigzag manner it is alternatively bent repeatedly and is separated. In addition, as the contact length of the W/S with the pairs of the rolls 7A-7D become longer, the bending of the core metal is effected more precisely and the bending accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an extruded product in which a separable mandrel is buried so as to have three-dimensional flexibility in a longitudinal direction, and the mandrel has a required U-shape. The present invention relates to a device used for bending, and is particularly applicable to bending rubber ψ soft synthetic resin extrusions such as weather strips and trims equipped with U-shaped grips.

Here, as an extruded product containing a cored metal, a rubber weatherstrip (hereinafter abbreviated as rW/SJ) consisting of a hollow seal part l and a grip part 3 in which a cored metal 2 is embedded, as shown in Fig. 1, is used. In W, explanation will be given by taking as an example a case in which the grip portion 3 is bent into a U-shape as shown by the two-dot chain line, but the present invention is not limited to this.

Conventionally, this type of bending device 4 has a convex roll 5 that supports the core bar 2 from the bending direction side, and a convex roll 5 that supports the core bar 2 from the outside to form the bending angle of each step. As shown in FIG. 4, a plurality of pairs of bending rolls 7A (7B, 7C17D) paired with regulating concave rolls 6A (6B, 6C16D) are arranged horizontally in sequence, and usually the core metal separation device 8
The core metal separation device 8 disposed after the core metal separation device 8 separates the core metal 2 buried in the grip part 3 of the W/S in the state shown in FIG. , 9B, 9C, 19D, and 9E repeatedly apply horizontal and vertical bending movements to the thin walled portions 2a, 2 at both ends.
The core bar 2 is divided at b to form a large number of short shelf shapes, so that the core bar 2 has three-dimensional flexibility in the longitudinal direction. In addition, a pulling machine 10 is disposed in front of the core metal separation device 8, but without this, it would be necessary to forcefully pull the metal with the bending device 4 (the vulcanization tank 11 and the core metal separation device 8 This is because, as a result, a strong tensile force is applied to the W/S during the core metal separation process, which may cause damage to the W/S. In addition, in Fig. 4, 11 is a vulcanization tank, 1
2 is an extruder.

In this way, in the conventional W/S production line, the vulcanization tank 11
After that, a take-up machine 10, a core metal separation device 8, and a bending device 4 must be installed in sequence, which increases the length and equipment cost, and also reduces productivity because the core metal separation Φ bending process is performed separately. It wasn't good.

In view of the above, this invention is a bending device for cored extrusions that can shorten the production line for W/S (extrusions with cored metals), reduce equipment costs, and improve productivity. The purpose is to provide

The bending device for extruded products containing cored metal of the present invention consists of a convex roll that supports the cored metal from the inside in the bending direction, and a concave roll that regulates the bending angle of each stage of the cored metal from the outside so that the bending angle is the same. The above object is achieved by arranging a plurality of pairs of bending rolls in a meandering manner.

Hereinafter, one embodiment of the present invention will be described based on illustrated examples.

As shown in FIG. 7, the bending device 14 of the embodiment includes a plurality of pairs (four pairs in the example) of bending rolls 7A similar to the conventional one.
, 7B, and 7C17D are arranged in a meandering manner. At this time, the bending angle α of the meandering varies depending on the degree of U-shaped bending required for the core metal and the ease of separation, but is usually 3.
0 to 1406. The bending device 14 of this embodiment is disposed immediately after the vulcanization tank 11, as shown in the figure, with the removal machine and core separation device omitted.

The core metal 2 embedded in the grip part 3 of the W/S extruded from the extruder 12 and vulcanized is attached to each bending roll pair 7A, 7B, 7C.
By passing between the bending rolls 7A, 7B, and 7C17D while being sandwiched, the bending process is performed into the required U-shape as in the conventional method, and at the same time, since these bending roll pairs 7A, 7B, and 7C17D are arranged in a meandering manner, reverse bending motion is performed. The receiver is separated. At this time, the length of the contact portion with the rolls between each pair of rolls 7A, 7B, and 7C17D of the W/S is also increased, so that the bending of the core metal is performed more reliably and the processing accuracy is improved. Moreover, each pair of rolls 7A, 7B, and 7C17D is driven to be able to send out the W/S, that is, to take it back, so naturally it also functions as a take-up roll.

The bending device for extruded products containing cored metal of the present invention can also serve as the above-mentioned take-over and separation of cored metal, and can also be used for W/S
The line length for manufacturing extruded products with cored metals such as
Productivity is also improved because bending can be done at the same time.

5-

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a W/S, which is an example of an extruded product with cored metal, Figure 2 is a vertical cross-sectional view showing the bending state of the W/S in Figure 1, and Figure 3 is a cross-sectional view of a pair of bending rolls. FIG. 4 is a perspective view of a W/S manufacturing line equipped with a conventional bending device, FIG. 5 is a perspective view showing an example of a full-core metal core for W/S, and FIG. 6 is a bending process according to the present invention. It is a diagram showing a W/S manufacturing line in which processing equipment is arranged. 2... Core bar, 4, 14... Bending device, 5...
Convex rolls, 6A, 6B, 8C, 6D... Bending roll pair, 8... Core metal separation device, 11... Vulcanization tank, 12...
・Extruder, W...W/S (extruded product with cored metal). Patent applicant 6- JP-A-59-188421 (3)

Claims (1)

[Claims] An extruded product embedded with a separable core metal so as to have three-dimensional flexibility in a longitudinal direction is
A convex roll that supports the core from the inside in the bending direction, the device being used for bending into a letter shape;
A plurality of pairs of bending rolls are arranged in sequence, each of which is paired with a concave roll that regulates the core metal from the outside to a bending angle of each stage, wherein the plurality of pairs of bending rolls are arranged in a meandering manner. A bending device for extruded products with a cored metal.