JPH0313588A - Production of thin metal parts - Google Patents

Abstract

PURPOSE:To simply prevent the damage of guide holes and to enable high accuracy working by piercing the guide holes for working in a strip-shaped metal and coating the front and rear sides of parts contg. the guide holes with adhesive polyester tapes after developing a photoresist. CONSTITUTION:Guide holes 2 for working are pierced in a strip-shaped metal 1. Photoetching and press working are continuously carried out in accordance with the guide holes 2 to obtain thin metal parts. In this method, the front and rear sides of parts of the metal 1 contg. the guide holes 2 are coated with adhesive polyester tapes 15 after a photoresist is developed at the time of photoetching. The tapes 15 have superior chemical resistance and flexibility and prevent the etching of the walls of the guide holes 2 due to the penetration of an etching soln. The tapes 15 are stripped after photoetching, the resist is removed and prescribed press working is accurately carried out in accordance with the undamaged guide holes 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing thin sheet metal parts such as watch parts by photoetching and pressing from a band-shaped metal material.

[Summary of the invention]

The present invention relates to a method for manufacturing thin sheet metal parts from a strip-shaped metal material by a combined process of photo-etching and pressing. After being used for positioning during printing, the holes are also covered with polyester adhesive tape from the front and back after the next step of development processing to prevent erosion of the holes during subsequent etching. This is a continuous process using an etching press in which the kite hole is used as a guide hole in the press process of secondary processing.

[Conventional technology]

Conventionally, when manufacturing thin sheet metal parts by etching and pressing a band-shaped metal material using pre-drilled processing guide holes, photo-etching almost always requires the processing guide holes to be cut. No measures were taken to prevent erosion through etching. In exceptional cases where the hole needs to be protected, a sticky resin agent is filled into the guide hole in the pre-etching stage to reinforce any deficiencies in the resist coating on the previously formed hole and prevent subsequent etching. Attempts have been made to prevent erosion of the hole.

[Problem to be solved by the invention]

However, in conventional manufacturing methods, resist adhesion on the hole ends and hole inner walls is incomplete during the photoresist coating process of the pre-formed processing guide holes in the photoetching process, so the holes are etched by etching. There was a problem that the holes were corroded and their function as a guide hole for press working in the subsequent process was impaired. In addition, in the method of filling the hole with a slimy resin agent to prevent erosion of the hole by etching, which has been attempted on a special basis, a hardening process is performed after filling the resin. Resin agents suitable for this process have high curing temperatures, which can cause deterioration of the resist pattern, and long curing times, which require many man-hours and large-scale equipment, making them unsuitable for practical use. Another problem is that since the resin is filled from one side, the resin does not penetrate sufficiently on the other side of the material, and the hole is locally corroded by etching, so it cannot be used as a guide hole for press working. did not fully meet the requirements.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides processing guide holes for alignment of mask pattern printing in photoetching processing, and then, when the next step of resist development processing is completed, the width of the band-shaped metal material is Only the guide hole part, which is drilled at both ends in the direction, is made of chemically resistant material from the front and back of the material.
Moreover, it was completely covered with a flexible polyester adhesive tape.

[Effect]

With the above configuration, the guide for machining strip-shaped metal materials that has undergone photoetching will not be damaged at all and fully satisfies the requirements as a pilot guide hole for press working, making it possible to process high-precision parts. It can be carried out.

〔Example〕

Hereinafter, the present invention will be explained based on examples. As shown in Fig. 1, a machining guide hole 2 with a hole diameter of approximately 3.0 mm is formed at both ends in the width direction of the material by press working on a band-shaped metal material 1 with a plate thickness of approximately 0.15 mm. As shown in the figure, the strip-shaped metal material 1 is continuously placed in a pretreatment tank 3, a resist coating tank 4, and a resist coating tank 4. The mask pattern is baked by the exposure device 6 through the baking oven 5.Then, after the resist pattern is developed in the developer tank 7, the tape is drawn out from the tape feed reel 13 by the taping machine as shown in FIG. The rolled-out polyester adhesive tape 15, which has excellent chemical resistance and flexibility, is turned into a strip by the roller 14 so as to close the processing guide hole of the metal strip being transported! fi
It is attached from the front and back sides of the metal strip 1 to cover the processing guide holes 2 at both ends of the strip metal material 1 in the width direction of the material, as shown in FIG.

The taped metal strip is etched in an etching tank 9, the polyester adhesive tape is peeled off from the metal strip 1 by a tape winder 10, the resist is stripped off in a resist stripping tank 11, and the photo is washed. After completing the etching process, the strip metal material 1 is supplied to the connecting portion I2 to the press.

Next, in the pressing step, as shown in FIG. 5, a bent portion 16 is formed using the processing guide hole 2 as a reference, and the outer portion 17 connected to the strip metal material 1 is removed to form the completed sheet metal part. Obtained.

〔Effect of the invention〕

As explained above, this invention requires accurate mutual positioning of marking, hole punching, and shape punching by photo-etching and bending, drawing, and contour punching by press working, and that guide holes are formed in the press working stage. Since there is no damage, it is effective in machining parts with high precision. Furthermore, the polyester adhesive tape of the present invention can be easily applied using a simple method, and there is no need for post-processing as in the past (it is easy to peel off after etching, which has the advantage of reducing the number of steps).

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of forming guide holes for processing in a band-shaped metal material according to the present invention, Fig. 2 is an explanatory diagram of the process of the parts manufacturing method of the present invention, and Fig. 3 is an explanatory diagram of the photoetching process using a taping machine according to the present invention. An explanatory diagram of tape attachment; FIG. 4 is a plan view of a polyester adhesive tape attached to a strip-shaped metal material in the present invention; and FIG. 5 is a plan view of the strip-shaped metal material at a stage before cutting the part outline in press working in the present invention. It is a diagram. Connecting part to press, tape feeding reel, roller, polyester adhesive tape, bending part, outline cutting part Guide hole for band metal material processing Pre-treatment tank Resist coating tank Baking oven Exposure device Developing tank Taping machine Etching tank Tape winding machine Resist Peeling tank

Claims (1)

[Claims] In a method of manufacturing thin sheet metal parts by drilling guide holes for processing in advance in a band-shaped metal material and consistently performing photoetching and press processing based on the guide holes, after the photoresist development process in the photoetching process, A method for manufacturing a thin sheet metal component, comprising the step of covering the guide hole from both sides with polyester adhesive tape.