JPH03281033A - Precision casting method having crimping work - Google Patents

Abstract

PURPOSE:To transfer a marking having complicate and fine shape to a casting product by combining crimping work with etching and lost wax process. CONSTITUTION:Exposure is executed onto photoresist film 2 forming a pattern on a metallic mold 1 with an exposing device 4, and unexposed part is removed with a development. Successively, at the time of etching with chemical, the same marking as the pattern is etched. Further, by pressurizing wax into the metallic mold 1, the wax marking 6 having recessed or projecting face according to the pattern can be obtd. Further, after applying 10 a refractory of ceramic kind onto this wax marking 6, drying, dewax, burning 11 are executed, and by pouring the aimed metal kind 12, the casting product 13 having complicate and fine shaped marking, is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention involves etching a grain pattern, other ■ patterns, each R4 pattern, etc. onto the surface of a mold, precision transferring it by the a-stwax method, and performing precision casting. It relates to a method of manufacturing a product.

(B) Prior art As a conventional technology, in the metal-deficient casting method for ductile cast iron, wrinkles occur after casting, reducing the product value. Therefore, Japanese Patent Publication No. 19933/1983 discloses a method of preventing the surface of a cast product from becoming wrinkled by forming irregularities with a depth or height of 0.2 to IsI on the surface of the mold cavity.

Furthermore, as a method for forming unevenness on the surface of a press mold,
Japanese Patent Publication No. 1986 (1983) describes a method for forming press molds in which a metal tape coated with resin is attached to the metal surface and the metal surface is etched to create unevenness on the surface to form a desired pattern. It is disclosed in Japanese Patent No.-58791.

(c) Problems to be Solved by the Invention The technique disclosed in Japanese Patent Publication No. 19933/1987 is achieved by providing anti-slip unevenness on the surface of the cavity of the mold, and the depth of the unevenness is If the height or height is less than 0.2 mm, the effect is small (if it is more than 1 mm, it is effective, but it often becomes DB due to the appearance and function of the manufactured product, so by setting it to 02 to 10 ROM, a large one can be made small.) Therefore, the pattern imparted to the surface of the cast product is merely small wrinkles, which does not solve the problem.

Furthermore, the technology disclosed in Japanese Patent Publication No. 60-58791 is to form an uneven pattern on the surface of a press mold. After degreasing the surface of the mold, a polyester film is coated and an aluminum tape is punched out in a predetermined shape. to form a predetermined pattern to be etched on the surface of the press mold. In this method, the method of forming a recess by corroding the surface of the press metal M in the perforated part of the aluminum tape by masking the peripheral part of the surface of the press mold after pattern formation and other parts that do not require etching is the present invention. This problem cannot be solved because it does not result in a state in which a wide variety of patterns are applied.

(d) Means for solving 1 m fi The present invention has already dealt with the above-mentioned problem, and general etching on molds is already known, but leather texture patterns, floral patterns 41 patterns, geometric horizontal patterns, etc. A patterned film such as a photosensitive resin film is closely attached to a photosensitive resin film, exposed to light, developed, and etched to form a desired pattern. Therefore, after etching is completed, the masking in the unexposed areas is dissolved and removed with a solvent and the surface is cleaned, before proceeding to the next step, the lost wax method, using a textured mold to perform Wax III! ! The surface of the pine jar is coated with ceramic 1x 7 to 8 times, laminated, and then dried.

Next, the dried ceramic and wax molds are heated to dewax,
After firing the hollow mold, each metal material is injected into the mold to create a product with the desired pattern. The aim is to easily apply any pattern using a fine wire diameter with a return wire and transfer it to the cast product by combining the conventional etching texture method and the lost wax method. It is an attempt to provide a way to do things.

(e) Effect Since this experiment has the above-mentioned configuration, a pattern film is produced by transferring various frame ridges onto a transparent film, and when it is closely attached to the crotch of the photosensitive resist and exposed to ultraviolet rays, the pattern portion becomes unexposed. In other cases, the film is cured by exposure to light and becomes insoluble.

Furthermore, when the exposed photosensitive resist (41) is brought into close contact with the mold, which is the workpiece, and developed with 2 to 4% anhydrous sodium carbonate, only the pattern in the unexposed area is removed, so the base of the workpiece is exposed. . Next, areas unrelated to the etching process are masked with a material that is insoluble in the etching solution, and only the patterned areas are subjected to erasure. When etching, add a small amount of hydrochloric acid, nitric acid, hydrotubic acid, etc. to a ferric chloride aqueous solution or dichloromethane solution, and when the workpiece is immersed in the etching solution, only the patterned part will be immersed in the etching solution. The desired etching depth can be determined by immersion time, liquid temperature, and liquid concentration.

Furthermore, when wax is press-fitted using a workpiece provided with a grain pattern, a model of the same type as the target is created, and the wax tllU is assembled and cleaned, followed by ceramic coating in the next step.

At that time, the ceramic coating on the wax involves alternately depositing mud-like ceramics and granular ceramics.
After repeating drying and repeating 7 to 6 layers of stacking, the mold is completely dried, dewaxed, and hollowed out. When the mold is completely fired at around 1000℃, it becomes porous with good air permeability. When the desired gold gA is poured into the mold, fil given by Mr. Mboku
Close cast products can be made.

(f) Example Next, the most preferred illustrated example of this experiment will be described.

In the second factor, using the mold which is the workpiece in 1.
The photosensitive resist film 2 is adhered onto the workpiece. At this time, care must be taken not to entrap air.

In step 3 of (b), first create an original pattern, transfer it to a clear black and white transparent film, and adhere the negative and positive pattern films onto the photosensitive resist film. The pattern of the illustrated pattern film is a black belt-like line for easy identification, but it may be any other pattern such as a leather grain pattern, a horizontal floral pattern, or a geometric pattern. (C) shows a situation in which the light source 4 is irradiated from above the Butter 7 film, but exposure is performed using a fluorescent lamp that emits ultraviolet rays, a halogen lamp, a mercury lamp, or the like. In the exposed pattern film in the transparent part of the figure (d), the photosensitive resist film is cured by the transmission of ultraviolet rays and becomes insoluble in the developer. On the other hand, in the black portions of the pattern film, the photosensitive resist film is not affected by unfavorable light and is therefore eluted by the developer. In this case, the exposure time varies depending on the intensity of the ultraviolet rays, but it may take about 2 to 2 seconds for summer sunlight, and about 1 second to 20 minutes for an ultraviolet fluorescent lamp of about 60 W.

Next, in (e) the pattern film is removed and ~3%
Developing with anhydrous a'# and soda solution, the part through which the light was transmitted as shown earlier becomes insoluble and remains as it is, while the other part is removed by the developer and forms the mold surface which is the workpiece in l. base is exposed.

Next, before proceeding to the etching process, the side, back, and other surfaces of the workpiece other than the pattern are completely masked to prevent corrosion. In this case, any material may be used for masking as long as it is insoluble in the corrosive liquid, but materials that dissolve the resist film must be avoided.

In order to etch the (resist film removed by development in l) part, a ferric chloride aqueous solution (40-5%
) and cupric chloride water/11 liquid <<o -so* >tv
Etching is performed by adding hydrochloric acid, nitric acid, hydrofluoric acid, etc. to the main liquid depending on the material of the workpiece. In this case, as a condition for using the etching solution, the concentration of the solution should be 40~
50%, the liquid temperature is 40-50°C, and the opening during immersion depends on the etching depth.
For etching of 5 mm and 11 degrees, approximately one and a half hours can be used. In addition, for materials that corrode particularly quickly, such as aluminum, the concentration of the liquid, the temperature, and the IJ during immersion are
Use l ¥p l/+o as a guide.

In (g), the insoluble resist film on the etched workpiece is removed using acetone or a similar organic solvent, and at the same time, other masking materials are also removed. After removing these items, the surface of the gold M is cleaned by brushing with a brush made of a softer material than the workpiece. In this case, when wax and plastic are injected in a later process, it is necessary to thoroughly inspect whether the drafting slope has been determined, and if it is inappropriate, take countermeasures. For this purpose, supplementary provisions may be necessary.

In Figure 3 (@), the mold 1 has been etched first.
To create a pattern on the inside and to increase the thickness, a wax injection port of 5% was installed in the center of the mold and the wax was pressed in. do. In this case, the injection pressure is 30~
40Kg/cw' is enough, and the mold clamping pressure is also 5
0 gg/clt is sufficient. In addition, the wax material should be selected from a material that is less susceptible to deformation such as expansion and contraction.

Wax is press-fitted using this gold V, the mold is disassembled, and the wax model (b) is taken out.The wax model taken out has the shape of the desired pattern, and is assembled into a tree shape. After creating a method that is easy to work with, the surface of the wax is fI cleaned with a cleaning liquid to remove dirt on the surface of the wax.

Figure 4 (a) shows the state in which the assembled wax model is coated after cleaning. It is designed so that it can be lowered.In step 6, the surface of the wax model is coated with mud-like ceramic 1x.

This ceramic may be either an aqueous floidal silicate or a non-aqueous ethyl silicate. After coating these muddy ceramics by dipping and pulling them up, <b
) The situation in which the granular ceramics of No. 9 were allowed to flow and adhere to the surface is shown in No. 10.

The granular ceramic in this case uses 10 to 2,007,191 grains of zircon-based material, but it is not necessarily limited to this material (although it may be selected depending on the material to be cast).

In this way, the surface is coated with mud ceramic 1x,
Steps 7 to 8 of attaching granular ceramics to the surface and drying them
After repeating the process several times, dry it for more than 4S hours to obtain (C) 10
After the wax in the ceramic was melted by heating the ceramic model upside down, the mold was fired in an oxidizing atmosphere at around 1000°C to form a sintered body with good air permeability. Further, the desired metal is injected into the 10 molds using the 12 ladle (d), and then cooled and the metal is taken out from the mold.

(e) 13 is a metal with the desired shape, and is allied with the wax (! league), and is also on the same level as the original model, so it is difficult to change the shape of the wax to the mold grain 4!t1. Transfer, transfer from wax (11m) to ceramics, and further transfer from ceramics to castings can produce the desired casting.

(g) Effects of the Invention As is clear from the description of the embodiments described above, the present invention involves attaching a photosensitive resist onto a workpiece and transferring a desired pattern onto the workpiece by exposure, development, and etching. By press-fitting wax into the workpiece, a model exactly like Maki-sama can be made. Further, it is possible to transfer the Ix layer to ceramics, and further transfer from the ceramics to metal, which is a cast metal. Therefore, the conventional method is general,
By applying photographic technology and applying a pattern to a mold using an extremely simple method to create a pattern with a complex shape, it is possible to produce an excellent practical effect that has not been seen before.

[Brief explanation of drawings]

1st v! J is an overall flow of an embodiment of the present invention, FIG. 2 is a perspective explanation showing how it is used, ■, FIGS. 3 and 4 are detailed perspective explanations of FIG. 1! Workpiece. 3 film pattern. 5 Wax injection port. 7 spout. 9 Granular Ceramics. 1 l heating. 2 Photosensitive resist film. 4 UV lamp. 6 Wa ris Maki Tsuta! . 8 Mud-like ceramillis. 10 Ceramics casting alliance. 12 tribes, 13 products Figure 2 Figure 4

Claims (1)

[Claims] As a preliminary step to casting into a mold with a grain pattern through grain processing, a photoresist film patterned on the mold surface is exposed to light using an exposure device, and the unexposed portion is removed by developing the photoresist film. When etched with a chemical solution, the pattern is etched, and when wax is press-fitted into the mold, a wax model with concave or convex surfaces according to the pattern is completed.After coating this wax model with a refractory material such as ceramics, drying,
A casting method that is characterized by the fact that the grain pattern is accurately transferred according to the pattern by dewaxing, firing, and injecting the desired metal.