JPH0363200A - Grooving method - Google Patents

Abstract

PURPOSE:To dispense with cloth cutting work attended with difficulties and to obtain a good finish state by heating the metal wire material inserted in the annular groove part surrounding the three-dimensional curved surface of a work by high frequency dielectric heating when cloth is pushed in said groove part and heating the cloth in the groove part by the metal wire material to cut the same. CONSTITUTION:Cloth 2 is pressed to the entire surface of a three-dimensional curved surface 11 by the pressing surface 201 of a lower mold 200 to be bonded thereto and, at the same time, a cushion material 300 is sunk and the lower mold 200 falls with respect to a plug 400. With this operation, the circumference of the part bonded to the three-dimensional curved surface 11 of the cloth 2 is pushed in the annular groove part 12 of a work 1 by the metal wire material 500 provided to the leading end of the plug 400 to bond the cloth 2 to the groove part 12. When the metal wire material 500 is subjected to high frequency dielectric heating, the cloth 2 pushed in the groove part 12 to be bonded thereto is burnt off in the groove part 12 or fused to cut off an excessive part 21. By this method, cutting work becomes unnecessary and a good finish state is always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wood-graining method employed when attaching decorative cloth to the inner panel of an automobile door.

[Conventional technology]

FIGS. 5 and 6 show the conventional wood cutting method. In this method, as shown in FIG.
With the cloth 2 positioned and held by the lower mold 200 installed above, the upper mold 100 and the lower mold 200 are brought close together, compressing the cushioning material 300 and sinking the lower mold 200, as shown in FIG. A three-dimensional curved surface 1 formed on a workpiece 1 as shown in
At the same time, the end of the cloth 2 is pushed into the annular groove 12 surrounding the three-dimensional curved surface 11 with the tip of the plug 400, and the cloth 2 is pressed onto the entire surface of the three-dimensional curved surface 11. 11 and the groove portion 12 using an adhesive. Note that the adhesive is applied to the cloth 2 and the workpiece 1 in advance.

In such a conventional method, the workpiece 1 is used as the cloth 2.
In addition to taking into consideration the shape of the three-dimensional curved surface 11 and the depth of the groove portion 12, the fabric 2 is cut to a predetermined size and shape while taking into account the stretch of the fabric 2 in advance. Further, it is necessary to accurately position and hold the cloth 2 cut in this way on the lower die 200.

[Problem to be solved by the invention]

However, when the size of the cloth 2 is previously cut to match the size of the three-dimensional curved surface 11 of the workpiece 1 as in the past, it is difficult to accurately position and hold the cloth on the lower die 200. Furthermore, even if such accurate positioning is possible, wrinkles may occur in the cloth 2 during wood graining, and the end of the cloth 2 may not be pushed into the groove 12 reliably, resulting in an insufficient position or protruding from the groove 12. There was an inconvenience that it was difficult to obtain a good finished state.

In addition, cutting the cloth 2 in advance to match the size of the three-dimensional curved surface 11 of the workpiece 1 is a difficult task even for experienced workers. , appears more prominently as the shape of the three-dimensional curved surface 11 of the workpiece 1 becomes more complex.

The present invention has been made in view of the above-mentioned circumstances, and by adopting a procedure of cutting off the surplus portion of the cloth while performing wood graining using a cloth larger than the three-dimensional curved surface of the workpiece, To provide a wood graining method capable of eliminating inconveniences and at the same time eliminating the need for difficult cloth cutting work.

[Means to solve the problem]

The wood-graining method of the present invention involves pressing a cloth onto the entire surface of a three-dimensional curved surface formed on a workpiece, and at the same time pushing the cloth into an annular groove surrounding the three-dimensional curved surface. In the kimekomi method of bonding to the groove with an adhesive, a cloth larger than the three-dimensional curved surface of the workpiece is used, and when the cloth is pushed into the groove, a metal wire that is inserted into the groove with the cloth is heated by high frequency induction, The cloth is cut by heating the metal wire within the groove.

[For production]

According to this method, since a cloth larger than the three-dimensional curved surface of the workpiece is used, the cloth can be reliably pressed onto the entire surface of the three-dimensional curved surface without having to accurately position the cloth with respect to the three-dimensional curved surface. , it is reliably pushed into the annular groove around the three-dimensional curved surface.

In addition, since the cloth pushed into the groove is inserted into the groove together with the cloth and is heated and cut by a metal wire heated by high-frequency induction, the end of the cut cloth may protrude from the groove or be cut short. It will never become.

〔Example〕

The method of the present invention includes a step of pressing a cloth onto the entire surface of a three-dimensional curved surface formed on a workpiece (pressing step), a step of pressing the cloth into an annular groove surrounding the three-dimensional curved surface (pushing step), and a step of pressing the cloth into an annular groove surrounding the three-dimensional curved surface. and a step (adhering step) of adhering the three-dimensional curved surface and the groove portion with an adhesive. These three steps are also performed in conventional methods and are performed simultaneously.

Further, in the method of the present invention, a cloth larger than the three-dimensional curved surface of the workpiece is used. Furthermore, in addition to the above three steps, the method of the present invention further includes a step of high-frequency induction heating a metal wire inserted into the groove together with the cloth when the cloth is pushed into the groove (high-frequency induction heating step); The method includes a step of cutting the cloth by heating it with the metal wire (cutting step).

Each of the above steps will be explained below along with the apparatus for performing them.

In FIG. 1, a workpiece 1 is mounted on an upper mold 100, and the upper mold 1
00 and a lower mold 200 in which the cloth 2 is set. The upper mold 100 is made of electrically insulating synthetic resin, and its workpiece mounting surface 101 has the same shape as the back surface of the work l, and backs up the entire back surface of the work l. The workpiece 1 is held on the workpiece mounting surface 101 by known means such as suction. The workpiece 1 is, for example, a wooden inner panel used for automobile doors, and its surface has a complex three-dimensional curved surface 11.
and an annular groove 12 surrounding the periphery thereof.

The lower mold 200 is made of synthetic resin or metal such as aluminum, and has a pressing surface 201 having the same shape as the surface of the workpiece 1.
and is supported by a cushion material 300 such as a rubber material (for example, silicone rubber). Lower mold 200
A plug 400 made of brass or the like is placed around the plug 400, and a metal wire 500, such as a steel wire, capable of high-frequency induction heating is fixed to the tip of the plug 400 by known means such as brazing. On the other hand, the upper die 100 is provided with a work coil 600 for high-frequency induction heating the metal wire 500.
00 is made of copper and has a cooling water passage 601 therein, and when a current is passed while maintaining a specific positional relationship with the metal wire 500, the metal wire 500 is heated by high frequency induction to a predetermined temperature. 700 is a cooling water vibrator for cooling the plug 400.

When the upper mold 100 and the lower mold 200 are clamped, the cloth 2, which is larger than the three-dimensional curved surface 11 of the workpiece 1, is pressed against the entire surface of the three-dimensional curved surface 11 by the pressing surface 201 of the lower mold 200, as shown in FIG. Then, the above-mentioned pressing step is performed, and the cloth 2 is adhered to the three-dimensional curved surface 11. At the same time, the cushioning material 300 shown in FIG. The metal wire 500 at the tip of the plug 400 is pushed into the annular groove 12 to perform the above-mentioned pushing process, and the cloth 2 is adhered to the groove 12. In the pushing process, the cloth 2 is inserted into the groove 12.
When the cloth 2 is pushed in, the metal wire 500 is inserted into the groove 12 together with the cloth 2.

An adhesive necessary for the bonding process of bonding the cloth 2 to the three-dimensional curved surface 11 and the groove portion 12 is applied to the workpiece 1 and/or the cloth 2 in advance.

After the pressing process, pushing process, and bonding process, the cloth 2 is larger than the three-dimensional curved surface 11, so the cloth 2 is folded into the groove 12 as shown in FIG. 21 protrudes outside the groove 12.

After performing the three steps of pressing, pushing, and bonding, wait until the fabric 2 is firmly bonded to the three-dimensional curved surface 11 and the groove 12 with the mold closed, and then wait until the mold is closed. A high frequency induction heating process and a cutting process are performed.

In the high-frequency induction heating process, the work coil 600 is heated while cooling water is flowing through the cooling water passage 601 of the work coil 600.
This is done by passing a current through. In this way, the metal wire 500 that maintains a constant positional relationship with the work coil 600 is heated by high frequency induction to a predetermined temperature. Then, when the metal wire 500 is heated by high frequency induction, the cloth 2 pushed into the groove 12 and bonded to the groove 12 is heated.
2, the excess portion 21 is cut off or removed as shown in FIG. While the high frequency induction heating process and cutting process are being performed, the cooling water pipe 700 (
The plug 400 is cooled by water flowing through the drain (see FIG. 1).

After this, the mold is opened as shown in FIG. Then, the workpiece 1 with the cloth 2 mixed therein is removed from the upper mold 100 and moved to the next process.

Various types of cloth 2 are applicable to the cloth 2 used in the Kimekomi method described above, such as a strong cloth backed with a synthetic resin sheet and a flexible cloth without such a backing.
When using a cloth 2 that easily wrinkles, it is desirable to pull the cloth 2 when clamping the mold to prevent wrinkles.

〔Effect of the invention〕

As explained above, according to the present invention, not only is it unnecessary to cut the cloth in advance to match the three-dimensional curved surface of the workpiece, which requires skill, but also the cloth can be precisely cut against the three-dimensional curved surface of the workpiece. Positioning becomes unnecessary. In spite of this, the edge of the cloth does not protrude from the annular groove around the three-dimensional curved surface of the workpiece, and a good finished state is always obtained.

Furthermore, this effect is produced regardless of whether the fabric is strong and backed with a resin sheet such as polyvinyl chloride resin, or if it is flexible and has no such backing. , a good finish can be obtained regardless of the type of fabric. Further, according to the present invention, since the cloth is cut at the same time as the cloth is cut, there is no need for the troublesome process of cutting the cloth again after the cloth is cut.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a state in which a workpiece etc. is attached to an apparatus for carrying out an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams of a wood cutting method according to an embodiment of the present invention, and FIGS. FIG. 6 is an explanatory diagram of the conventional method. 1... Work, 2... Cloth, 11... Three-dimensional curved surface of work, 12... Groove of work, 500... Metal wire, 600... Work coil.

Claims (1)

[Claims] 1. Pressing a cloth onto the entire surface of a three-dimensional curved surface formed on a workpiece, simultaneously pushing the cloth into an annular groove surrounding the three-dimensional curved surface, and pressing the cloth against the three-dimensional curved surface. In the wood-graining method of bonding to the groove with an adhesive, a cloth larger than the three-dimensional curved surface of the workpiece is used, and when the cloth is pushed into the groove, a metal wire that is inserted into the groove with the cloth is heated by high-frequency induction. A kimekomi method characterized in that the fabric is cut by heating the metal wire within the groove.