JPS62156907A - Manufacture of compression-molded article - Google Patents

Abstract

PURPOSE:To contrive an improvement in workability, reduction in production cost and improvement in strength, by a method wherein a molding material mounted on a mold surface of a bottom force is moved by a conveying clamp and mold clamping is performed by making the material follow after the mold surface of a molding tool. CONSTITUTION:A top force 3 descends to some extent, in proportion to the descent of which a conveying clamp 4 moves in the directions C, D, a part outside of a mold of a molding mat 1 is inserted into the mold and the molding mat 1 is made into a state wherein the same is made to about follow after a mold form surface at a stage wherein mold clamping has been advanced to some extent. Although the mat 1 has begun to abut against a corner part 2a of a rising surface at this point, this is based on protrusion prevention force of the mold of the mat 1 by pressing force of the mat 1 based on the descent of the top force of the mat 1 based on the descent of the top force 3 and the clamp 4. As the mat 1 is stuck closely to a recessed part of the top force 3, even if the descent of the top force 3 advances further, it is not feared that generation of deterioration in density and breakage of the mat 1 in the corner part 2a of a protrusion of a bottom force which have been generated so far. The top force 3 descends down to the lowest position, mold clamping is completed and a compression-molded member 1b whose density is uniform and high is obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for producing a compression molded product, and in particular to a method for producing a compression molded product, in particular a method for manufacturing a compression molded product, and in particular a method for manufacturing a compression molded product, for example, a wood-based molding mat having concave and convex portions corresponding to the molding surfaces of the upper and lower molds. The present invention relates to a method of manufacturing a compression molded product having an uneven shape by pressurizing the material.

(Prior art) Conventionally, a molding mat is formed from a wood base material made by mixing a binder containing a synthetic resin with wood fibers obtained by defibrating wood chips, etc., and this molding mat is heated. - Compression molds are widely used to pressurize and produce hard wood-based compression molded products. The mold is composed of a lower mold and an upper mold. First, a molding mat is placed on the lower mold, and then the upper mold is pressed downward to mold the molded product into a desired shape.

When attempting to obtain an uneven molded product such as an IJ (for example, an automobile door) using the mold, a preliminary operation is required before compressing the molding material with the mold, so-called mold clamping, and the following steps are required. This was done in two ways.

First, as shown in FIG. 5, a molding mat 1 as a molding material is placed on the upper surface of the lower mold 2 of a metal mold.

At this time, the corner portion 2b of the convex portion formed on the molding surface of the lower mold 2 does not come into close contact with the molding surface, but is placed so as to bridge the protruding portions of the molding surface, so this bridging portion In order to prevent the mat 1 from breaking due to the convex part of the upper die 3 coming into contact with the mat 1, the operator manually shapes the bridging part of the mat 1 into an uneven shape, as shown by arrows A and B in FIG. Rising face corner 2
The mat 1 was placed along the molding surface of the lower mold 2 while being pressed against the mat 1.

Another method of setting the mat in the mold while preventing the molding mat from breaking is to set the mat in the compression mold from above the mat 1 placed on the lower mold 2, as shown in FIG. The upper mold 5 for preforming, which is different from 3, is lowered to form the mat 1.
The preformed material 1a was formed from the above.

The molding mat 1 is molded into the lower mold 2 by either of the above two methods.
As shown in FIG. 8, the upper mold 6 equipped with the heat generating plate 6 is lowered to pressurize and press the molding material.
Then, this was removed from the mold to obtain a compression molded body 1b having the shape shown in FIG. 9.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional compression molding mold,
It had the following problems.

First, since the molding mat 1 as a molding material placed on the lower mold 2 of the molding die is thick, if it is compressed and molded as it is with the upper mold 3, the mat 1 will break, so in order to prevent this, The operator cuts the raised surface corner 2 of the uneven part of the lower die 2.
It is necessary to align the mat 1 along the mat 1 and to form the preformed material 1a using the upper die 5 for preforming, which makes the compression molding work complicated and impairs workability. .

Further, providing the above-mentioned upper mold for preforming separately from the clay mold 6 for compression molding has the problem of increasing the equipment cost for compression molding and increasing the manufacturing cost of the compression molded body.

Furthermore, the molding mat 1 has a rough surface and has high slip resistance, and since the molding mat has wood fibers bonded with a binder, it will be compressed as it is when it comes into close contact with the molding surface of the mold. As a result, in areas where the shape of the molding surface changes at a steep angle, such as on both sides 2b of the convex portion, the density of the wood fibers contained in the molding mat decreases, and the strength of the compression molded product decreases. This problem is caused by positioning the molding mat on the upper surface of the lower mold convexity and then setting the mat along the rising corner 2a of the convexity.

The present invention has been made to solve the above-mentioned problems, and improves workability and manufacturing costs by omitting manual work and preforming in compression molding of a molding material using a mold having an uneven mold surface. The objective is to reduce this and also to improve the strength by uniformly sealing the molded body.

(Means for Solving the Problems) The method of the present invention for achieving the above object is to transport the molding material placed on the mold surface of the lower mold when compression molding the molding material using a mold. It is characterized in that it is moved by a clamp for clamping the mold along the mold surface of the mold.

In addition, in order to move the molding material by the transportation clamp and align it with the mold surface of the mold, the guard is used to move the material in an appropriate direction while holding the molding material in the transportation clamp. This can be done by providing an actuation mechanism that provides the desired function.

(Function) By configuring as described above, that is, by making the molding material placed in the mold follow the mold surface of the mold using the conveying clamp, it is possible to compress the uneven shape as described above. It exhibits a similar effect to manual operations and preliminary operations such as preforming when trying to obtain a molded body.

In particular, when the distance between the upper mold and the lower mold becomes close to a certain extent due to the lowering of the upper mold, the conveying clamps press both ends of the outside of the molding material inward into the mold, making it possible to avoid the conventional uneven corners. It is possible to eliminate the density loss and breakage of molded products that occur in areas where the mold surface shape changes at a steep angle. This is due to feeding a large amount of molding material into the mold to increase the density of the molded product. Conventionally, it was not possible to change the density of the molded product by changing the amount of molding material fed into the mold using the conveying clamp. This effect was not present in the preliminary operation.

EXAMPLES Hereinafter, examples of the method of the present invention will be explained in detail with reference to the drawings. Note that the present invention is not limited to the following examples.

Figures 1 to 4 are cross-sectional views for explaining one embodiment of the present invention, and the same numbers as in Figures 5 to 9 used to explain the prior art are the same. - or an equivalent member is shown.

FIG. 1 shows a state in which a wooden molding mat 1, which is a molding material, is placed on a lower die 2 of an uneven mold by a conveying clamp 4. As shown in FIG. The transporting clamp 4 shown in the figure shows only its clamping portion, and holds both ends of the molding mat 1 at multiple locations. The clamp 4 is the molding mat 1
It is connected to an actuating device (not shown) designed to perform an appropriate function by moving back and forth, up and down, and left and right according to the conveyance position of the mold, the shape of the mold, and the degree of descent of the upper mold. The molding mat 1 is slightly wide so that a certain portion protrudes outside the mold when it is placed. When placed, the molding mat l is not in close contact with the corner portion 2a of the rising surface of the lower mold 2.

FIG. 2 shows that the upper mold 3 is lowered to the extent that the upper mold 3 is lowered, and as the upper mold 3 is lowered, the conveying clamp 4 is moved in the C%D direction, and the molding mat 1
The outside part of the mold is inserted into the mold. FIG. 3 shows a state in which the molding mat 1 is aligned almost along the mold surface after mold clamping has progressed to a certain extent.

At this point, the mat 1 begins to come into contact with the rising surface corner 2a, and this is due to the pressing force of the mat 1 due to the lowering of the upper die 3 and the force of the clamp 4 to prevent the entire mat 1 from protruding out of the die. Since the mat 1 is in close contact with the concave portion of the upper mold, even if the upper mold 3 continues to descend further, there is no risk of the mat 1 decreasing in density or breaking at the corner 2b of the convex portion of the lower mold, which has conventionally occurred. FIG. 4 shows a state in which the upper mold 3 has descended to the lowest position and mold clamping has been completed. Thereafter, the mold is removed in accordance with a conventional method to obtain a compression molded body 1b having a uniform and high density.

In the above embodiment, both ends of the molding mat 1 are simply pressed by the conveying clamps 4, but depending on the shape of the mold and the desired properties of the molded product, one or both ends of the molding material may be pulled. Alternatively, the clamping position of the clamp 4 may be changed at different locations. Furthermore, as the upper mold 3 descends, the clamp 4 may apply rhythm or pulsation to the molding material.

(Effects of the Invention) As explained in detail above, the method for manufacturing a compression molded product of the present invention has the following effects. First, the worker does not have to manually set the molding mat to follow the shape of the lower mold, thereby saving time required for the compression molding cycle and improving work efficiency.

In addition, in order to improve workability, there is no need to add preforming to shape the molding mat in the pre-compression molding process, so you can save on equipment investment such as preforming equipment, and manufacture Cost increases can be suppressed.

In addition, it is possible to eliminate uneven density and breakage of the compression molded product due to the dragging of the molding material on the friction surface due to the lowering of the upper mold, which was not fully resolved even with the above preliminary operation, so the molded product This will improve durability and reliability.

[Brief explanation of drawings]

Figures 1 to 4 are for explaining the molding process according to an embodiment of the method of the present invention. Figure 1 is when the molding mat is placed, Figure 2 is when the conveying clamp is activated, and Figure 3 is when the conveying clamp is activated. Figure 4 is a sectional view showing the state when mold clamping is in progress, Figure 4 is a cross-sectional view showing the state when mold clamping is completed, Figures 5 to 9 show the compression molding process using a conventional mold, and Figure 5 is a cross-sectional view showing the state when mold clamping is completed. Fig. 6 shows the preliminary hand work, Fig. 7 shows the preliminary molding using the preliminary mold, Fig. 8 shows the completed compression molding using the mold, and Fig. 9 shows the molded product removed from the mold. FIG. In the figure, 1...Molding mat 1a...Preformed material 1b
...Compression molded product 2...Lower mold 2a...Rising surface corner 3...Upper mold 4...Transportation clamp 5
... Preforming upper mold patent applicant Toyota Motor Corporation Figure 5 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] When compression molding the molding material using the mold, the molding material placed on the mold surface of the lower mold is moved by a conveying clamp and clamped along the mold surface of the mold. A method for manufacturing compression molded products.