JPH0263614A - Enamel substrate and its manufacture - Google Patents

Abstract

PURPOSE:To manually cut an enamel base plate and to increase the rate capable of being used as an actual enamel substrate by providing a cutting groove at a cutting part without providing connecting parts for cutting on a multi-piece arrangement enamel substrate and providing holes at intersections of the grooves. CONSTITUTION:Connecting parts for cutting are removed from a metallic core of a multi-piece arrangement enamel substrate and wedge-shaped notches are provided at a prearranged part to be cut and rectangular holes are provided at intersections of cutting plane lines. Wedge-shaped groove parts are formed by a press from both sides on the cutting plane lines. Enameling, formation of a circuit and packaging of parts are executed under such state. After the enamel substrate is completed, it can be cut by bending the plate manually. Consequently, the rate of area capable of being used as a base plate can be increased drastically.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a multi-layer enamel substrate that can be cut by hand and has a large space factor (substrate occupation rate), and an efficient manufacturing method thereof. Regarding.

[Conventional technology]

Conventionally, a multi-layer enameled substrate was made and each single substrate was cut from the enameled substrate by a cutting machine using a press or a grindstone after enameling.

When cutting with a press, the cut portion is subjected to shearing force and deforms to some extent, which may damage the enamel and adversely affect conductor circuits and the like. Therefore, it is necessary to provide a cut portion with a certain length.

Further, in the case of cutting with a grindstone, the cutting part needs to be long enough to accommodate the thickness of the grindstone and allow for the movement of the grindstone. Therefore, as shown in FIG. 2, it was necessary to create a multi-layer enamel substrate in which each single substrate was connected by a connecting portion.

The above-mentioned cutting method using a press or a grindstone has the disadvantage that the substrate is contaminated with cutting powder and the like, so cleaning is required after cutting. Therefore, cutting after circuit formation and component mounting is time-consuming and difficult. Another problem was that the length of the cut portion varied, resulting in poor dimensional accuracy.

[Problem to be solved by the invention]

On the other hand, the present applicant previously proposed a method of manually cutting chocolate by manually folding it along the grooves (chocolate break) in Japanese Patent Application No. 63-168.
No. 953, enamel substrate and method for manufacturing the same.

However, even in this multi-layer enamel substrate, there is a connection part that connects each single substrate as shown in Figure 2, so the percentage of multi-layer enamel substrates that actually become enamel substrates is low. There was a problem that the substrate occupation rate (space factor) was poor. Further, there is a problem in that the connecting portion remains as a protruding portion on the substrate after cutting.

The object of the present invention is to provide an enamel substrate that can be cut into single substrates by hand bending from a multi-layer enamel substrate, which has a good space factor, has no variation in dimensional accuracy after cutting, and It is an object of the present invention to provide an enameled substrate in which no protrusion remains on the substrate after cutting, and an efficient manufacturing method thereof.

[Means for Solving the Problems] The present inventors conducted extensive research in order to solve the above problems.

As a result, the boards that are to be cut in large numbers are made in a continuous form without connecting parts between each single board, and are made of enameled boards with grooves pre-grooved in the metal core of the part to be cut. Although pressing is superior in terms of speed to machining (cutting) to form this groove, it is difficult to make a press mold at the intersection of the grooves to be cut. In addition, the life of the press blade will be shortened due to excessive force, so to avoid this, by punching a hole at this intersection in advance,
The present invention was completed by discovering an enamel substrate and a water scale that are easier to manufacture and have a longer lifespan, and which are easier to fold and cut by hand as an enamel substrate.

In other words, the present invention provides a multi-sheet enamel substrate,
This is an enameled substrate in which a cutting groove is provided in the cutting part and a hole is provided at the intersection of the grooves without providing a connecting part for cutting.The method for manufacturing it is to attach a metal core before enameling. This method of manufacturing an enameled substrate is characterized by forming a cutting groove in a portion to be cut using a press.

In the enamel substrate of the present invention, each single substrate has a continuous shape without providing particularly thin cutting parts such as connecting parts as in the past, and the metal core is cut along the cutting line of the metal core. Grooves are formed, and the intersections of the grooves are punched out in advance to form holes.

The grooves may be formed from only one side or from both sides, and may have any shape such as a ■-shaped groove or a U-shaped groove. The width of this groove can be about 174 mm or less, which is the length of the conventional connecting part, so
As is clear from the examples described later, the area ratio and space factor that can be used as a substrate are greatly increased. In addition, with conventional boards with connecting parts, the length of the cut part varies depending on which part of the connecting part is cut, resulting in poor dimensional accuracy, but in the present invention, grooves are formed in the metal core. Since the cutting portion is determined in stages, dimensional accuracy is improved. Further, although conventionally there was a protrusion remaining at the connecting part at the cut part, in the present invention, no protrusion is formed at all.

As for the manufacturing method, a hole is punched out at the intersection of the grooves, so it is possible to use a straight-edge type press, and the press die is easy to manufacture. It is longer because there is no part that is subject to excessive force.

〔Example〕

The present invention will be specifically explained below with reference to Examples.
The present invention is not limited in any way by this example.

A board from which a large number of 10m5+ square boards are taken will be explained.

The metal core of the multi-chip board is shaped as shown in Figure 1, the conventional connection part is eliminated, and a wedge-shaped cut is made at the end where the cutting is planned, and a rectangular hole of 1NR square is provided at the intersection of the cutting lines. . Wedge-shaped grooves are formed on both sides of the cutting line by pressing. With this shape, enameling, circuit formation,
Mount the parts. After completion, it can be easily cut by hand bending.

As a comparative example, as shown in FIG. 2, a metal core in which the boards of each car were connected by connecting parts was used as a conventional multi-chip board. Enameling, circuit formation, etc. were performed in the same manner as in the examples.

After completion, cutting was performed using a rotating grindstone.

In this case, cleaning after cutting powder is required.

A comparison of the cutting, space factor, dimensional accuracy, and protrusion of the cut portion between the two is as shown in the table below.

〔Effect of the invention〕

In the enameled substrate of the present invention, grooves are formed in advance at the intended cutting portions by pressing or the like in the metal core of the multi-sheet substrate, and holes are punched at the intersections of the planned cutting lines. Therefore, unlike conventional multi-chip boards, there is no connection part for connecting each single board, and it can be easily folded and cut by hand after baking the enamel, conductors, etc., or after mounting components. At this time, when press-cutting the substrate using the conventional method, the enamel would crack, and cleaning would be required after both grindstone-cutting and press-cutting, but the method of the present invention does not cause any damage to the enamel. It can be cut without any damage, and there is no need for cleaning afterward.

Furthermore, since there is no connecting section, the space factor (substrate occupation rate) is increased, and even in the same enamel firing furnace, a larger number of single substrates can be fired at once, thereby increasing production efficiency. Furthermore, the dimensional accuracy of each single substrate is improved, and there are no protrusions at the cut portion, which has many advantages.

As for the manufacturing method, forming grooves by pressing is efficient, but in this case, it is difficult to make a press mold at the intersection of the cutting lines, and unreasonable force is applied, which shortens the life.

Since the present invention is an enameled substrate with holes drilled at the intersection points, it is easy to manufacture a press mold, and the life of the press blade is long, so that the enameled substrate of the present invention can be manufactured efficiently.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a multi-chip substrate of the present invention (the dotted lines represent grooves to be cut). FIG. 2 is a plan view of a conventional multi-chip board with a connecting section.

Claims (2)

[Claims] 1. An enamel substrate for making multiple sheets, in which cutting grooves are provided in the cutting section and holes are provided at the intersections of the grooves, without providing a connection section for cutting. 2. 2. The method of manufacturing an enameled substrate according to claim 1, wherein cutting grooves are formed by pressing in the portion of the metal core to be cut before the enameled substrate is enameled.