JPH07276507A - Simple photo-shaped mold and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a simple photo-shaped mold, with which the usage of valuable photo-setting resin is reduced and which has no fear of deformation at manufacturing and further the machining after the shaping in which is easy. CONSTITUTION:A handy photo-shaping mold 1 is equipped with a base (a reference plate) 21 and a shaped part 11 for transferring a shape, which is photo- shaped on the base 21. The base is a steel plate, the surface of which is machined. Since being constituted as mentioned above, the base 21 and the shaped part 11 for transferring the shape can be treated integrally (or dismounted from a photo-shaping device, machined, assembled with a machine in use or the like integrally). As a result, no fear of deformation develops. Or, the necessary amount of the photo-setting resin is reduced by the amount of the base. Further, the machining after photo-shaping becomes also easy and accurate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple mold used for manufacturing a prototype or the like and a manufacturing method thereof. In particular, the present invention relates to a simple mold that can be manufactured with a low man-hour and a short delivery time using a stereolithography process, and a manufacturing method thereof.

[0002] The stereolithography referred to here is, in addition to the stereolithography in a narrow sense, to obtain a product of a predetermined shape by irradiating light (visible light, laser beam, ultraviolet ray, etc.) curing resin with light to solidify the resin. It includes a shaping system using a suitable fluid medium that hardens in response to reactive energy such as electron beams, X-rays, and energetic particle beams. It also includes a modeling system that employs a technique for accurately positioning and projecting small units of reactive chemicals onto a fluid medium that hardens in response to the reactive chemicals. It also includes modeling systems that use so-called lithographic techniques to project such energy or material through a mask.

[0003]

Related Art The inventors of the present invention have proposed, in Japanese Patent Application No. 6-23492 (the same applicant as the present application), a simplified optical molding die and a manufacturing method thereof (hereinafter referred to as a prior invention). The present invention relates to the improvement.

The simplified stereolithography of the prior invention comprises a photocurable photocurable resin, or reinforced particles dispersed and blended in the photocurable resin. Examples of reinforcing particles include glass beads (particle size examples: 3 to 70 μm) and whiskers. According to the method for producing a simplified optical molding method of the prior invention, an uncured photocurable resin or a photocurable resin in which reinforcing particles are dispersed and mixed is arranged hierarchically, and the photocurable resin is formed in various patterns by using CAD data or the like. The layers are selectively exposed to produce a stereolithographic mold.

[0005]

DISCLOSURE OF THE INVENTION The simple mold disclosed as the embodiment of the prior invention is basically a stereo-molded product. When attaching the stereo-molded simple mold to an injection molding machine or the like, it was planned to attach it to a steel die plate or the like with bolts or the like. However, it has not been proposed that the simple mold itself is provided with a plate (a product in which the plate and the stereolithography part are combined).

When the entire die is formed by stereolithography, the following problems occur. When machining a mold after modeling, it is difficult to obtain an accurate machining reference surface. The mold may be deformed when the molded mold is removed from the molding table of the optical molding apparatus. It is inconvenient to provide a screw or the like that requires local strength. A large amount of expensive photocurable resin is required.

It is an object of the present invention to provide a simplified optical molding mold and a method for manufacturing the same, which requires less expensive photocurable resin and is free from deformation during manufacturing. Further, it is an object to provide an optical molding simple mold which is easy to machine after molding and a manufacturing method thereof.

[0008]

In order to solve the above-mentioned problems, the simplified optical-manufacturing mold of the present invention comprises a base and a shape-transfer molding part which is stereo-molded on the base. To do.

Further, according to the method of manufacturing a simplified optical molding of the present invention, a base made of a metal material having a machining reference surface formed on the surface thereof is placed on a molding table, and then the shape is transferred onto the base. It is characterized in that the shaping part is optically shaped, then the base body and the shaping part for shape transfer are integrated and removed from the shaping table, and then the shaping part for shape transfer is machined with reference to the machining reference surface of the base body. .

[0010]

The simple stereolithographic mold of the present invention is not entirely stereolithographically molded, but has a stereolithographically shaped shape transfer molding portion integrally mounted on a substrate. Here, the base means a member made of a solid having a certain strength and rigidity. For example, surface machined steel plates. With this structure, the substrate and the shape transfer molding part are handled integrally (removal from the optical molding device, machining, working on the machine used, etc.)
be able to. Therefore, there is no risk of deformation (less risk). Alternatively, the required amount of the photocurable resin is reduced by the amount of the substrate. Furthermore, by providing a machining reference surface on the substrate, machining after stereolithography is easy and accurate. Furthermore, it is also advantageous to provide cooling water passages, often associated with threads, in or on the substrate.

[0011]

EXAMPLES Examples of the present invention will be described below. Figure 1
It is a side view showing a core mold for injection molding concerning one example of the present invention. The core mold 1 is roughly divided into a reference plate 21 (base body) in the lower half of the figure, and a shape transfer molding section 11 formed thereon. The shape transfer modeling section 11 further includes a core 13 (shape transfer section in a narrow sense) and a base section 15.

The reference plate 21 of the core die 1 in FIG. 1 is a plate made of steel (JIS S45C) and having a thickness of 10 mm. The upper and lower surfaces of the reference plate 21 and each side surface are machined. FIG. 2 is a plan view showing an upper surface of the core type reference plate of FIG. This will be described with reference to FIGS. 1 and 2. Tap holes 23 are provided at four corners of the reference plate 21. The tap hole 23 is used for the shape transfer molding part 1.
This is for screwing the tightening bolt 19 in order to tighten the base portion 15 of No. 1 and the reference plate 21. On the lower surface of the reference plate 21, a die set attachment tap hole 25 for attaching the reference plate 21 (core mold 1) to the die set of the injection molding machine (see FIG. 3) is provided.

The upper surface and the lower surface of the reference plate 21 are basically parallel to each other. The central portion of the upper surface of the reference plate 21 is a knurled portion 35. Unevenness of the knurled part 35 (roughened surface, height example 0.05 to 0.5 m
Since m) is present, the bonding between the reference plate 21 and the shape transfer molding portion that is optically molded thereon is strengthened. Two cooling water grooves 27 are cut on the upper surface of the reference plate 21. The cooling water groove 27 serves as a passage for sending the cooling water to the base portion 15 of the shape transfer molding section 11. The cooling water groove 27 communicates with a valve mounting tap hole 29 through a cooling water hole 28 formed in the reference plate 21. A cooling water inlet valve 31 and a cooling water outlet valve 33 are screwed into the valve mounting tap hole 29.

The base portion 15 of the shape transfer modeling portion 11 is a base portion of the core 13. It is also possible to immediately perform stereolithography of the core 13 on the reference plate 21 without the base portion 15. However, in order to strengthen the connection between the reference plate 21 and the stereolithography portion, such a base portion 15 is provided, and the base portion 15 and the reference plate 21 are fastened to each other by the tightening bolt 1.
It is preferable to tighten at 9. The stepped holes formed at the four corners of the base 15 are holes for passing the tightening bolts 19. A cooling water hole 17 is formed in the base portion 15. Cooling water is supplied to the cooling water hole 17 from a cooling water groove 27 on the upper surface of the reference plate 21. Such a cooling water hole is required in a mold such as an injection mold that needs to remove the heat of solidification of a molding target. The base 15 and the core 13 are integrally formed by optical molding, and the connection between both parts is strong.

FIG. 3 is a view showing a state in which a die including the core die of FIG. 1 is attached to an injection molding machine. The core mold 1 and the cavity mold 3 are mounted on the die set 41 and the die plate 43 using the reference plate 21 as a back plate.

Next, a method for manufacturing the simplified optical molding die of this embodiment will be described. (1) Preparation of reference plate: A processed reference plate 21 was prepared as shown in FIGS. The cooling water valves 31 and 33 are attached to the reference plate 21 in advance. The reference plate 21 thus configured was positioned and fixed on the modeling table of the optical modeling apparatus (manufactured by Teijin Seiki Co., Ltd., SOLIFORM-300).

(2) Preparation of photo-curable resin containing reinforcing particles: Specifications 12 to 13 of Japanese Patent Application No. 6-23492 filed by the same applicant
An optical shaping composition containing aluminum borate whiskers and glass beads described on page was prepared.

(3) Stereolithography: According to the method of Japanese Patent Application No. 6-5519 (coating → laser scanning exposure), which is the application of the present applicant,
A mold was formed by performing photocurable resin lamination and selective exposure. The conditions at this time were as follows. Photocurable resin layer thickness: 0.05 mm Exposure conditions: Argon laser (wavelength 368 μm), laser power 200 mW, scanning speed 10 m / sec At this time, the modeling start height of the modeling table was reduced by the reference plate thickness. .

(4) Removal of molded article: After optical molding, the reference plate was taken out from the molding table. (5) Cleaning: IPA (iso.
Propyl alcohol).

(6) Post-cure: A photo-molded object was irradiated with a UV lamp (metal halide lamp, 4 KW) for 20 minutes to carry out secondary curing.

(7) Fixing the tightening bolts: the base part 1 produced by stereolithography
Holes for inserting tightening bolts were machined at the four corners of No. 5 coaxially with the tap holes 23 of the reference plate 21. Then, the fastening bolt 19 was screwed in, and the base portion 15 was fastened to the reference plate 21. The reason for doing this is as follows. That is, since the stereolithography resin is originally an adhesive, it is well bonded to the reference plate. Further, since the surface roughness of the reference plate is roughened, the adhesive force is sufficiently high. But,
This adhesive strength alone is not sufficient to withstand mechanical vibration, impact, etc. during post-processing. Therefore, the fastening bolts are fixed as described above.

(8) Post-processing: An optical molding (modeling portion 11 for shape transfer in FIG. 1) was machined. Finishing of the partition surface (upper surface of the base 15), extrusion pin holes (not shown) of the injection-molded product, gate (not shown), etc. were machined. At this time, the machining was accurate and quick because the machining was performed using the reference surface (lower surface, side surface) of the reference plate 21 as a reference.

The mold thus produced was incorporated into an injection molding machine as shown in FIG. 3 and injection molding was carried out. The molding result was good.

[0024]

As is apparent from the above description, the present invention exhibits the following effects. Since the reference plate (base body) and the stereolithography product can be handled as a unit, the handling is easy and deformation of the stereolithography product can be prevented.

Since the photo-fabricated product is manufactured by curing a photo-curable resin into a thin layer, a slight warp may occur during modeling. However, when performing stereolithography on the substrate, such warpage can be suppressed to a minimum.

Since the expensive photocurable resin can be saved by the amount of the substrate, the cost can be reduced. Also, the molding time is short. Providing a machining reference surface on the base makes post-processing after stereolithography easy and accurate.

The strength of the mold is improved by the substrate. If you use a substrate with high thermal conductivity (made of metal material, etc.),
The cooling effect of the mold is also high. Therefore, the molding efficiency of the molded product also increases. If the substrate is preliminarily processed in various ways (cooling water passages, tap holes, etc.), the post-processing work will be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an injection molding core die according to an embodiment of the present invention.

FIG. 2 is a plan view showing the upper surface of the core type reference plate of FIG.

FIG. 3 is a diagram showing a state in which a mold including the core mold of FIG. 1 is attached to an injection molding machine.

[Explanation of symbols]

1 core type 3 cavity type 11 shaping part for shape transfer 13 core 15 stand part 17 cooling water hole 19 tightening bolt 21 reference plate (base) 23 tap hole 25 die set mounting tap hole 27 cooling water groove 28 cooling water hole 29 valve Mounting tap hole 31 Cooling water inlet valve 33 Cooling water outlet valve 35 Knurling part 41 Die set 43 Die plate

Claims (5)

[Claims] 1. A simplified optical molding die, comprising: a base; and a shape-transfer molding part optically molded on the base. 2. The simplified optical molding die according to claim 1, wherein the base is made of a metal material, and a machining reference surface is formed on the surface of the base. 3. The simplified optical molding die according to claim 1, wherein the upper surface of the base is roughened, and the shape transfer molding section is molded on the surface. 4. The simplified optical molding die according to claim 1, 2 or 3, wherein the substrate has a cooling water passage. 5. A base made of a metal material having a machining reference surface formed on its surface is placed on a molding table, and a shape transfer molding section is optically molded on the base, and then the base and the shape are formed. A method for manufacturing a simplified optical molding method, in which the transfer molding unit is integrally removed from the molding table, and then the shape transfer molding unit is machined using the machining reference surface of the substrate as a reference.