JPH0232125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a mold for molding, and more particularly to a mold for molding, in which a through hole is provided in the mold part of the mold, and a mold release agent can be exuded onto the molding surface through the through hole. It is related to molds.

Conventional technology In general, injection molding involves injecting materials such as synthetic resin or rubber into a mold to form a desired shape. After molding, the molded object becomes adhered to the molding surface of the mold, and the shape may be damaged when the molded object is removed from the mold. This tendency is the same in other molding methods such as rim molding and blow molding.

Therefore, when molding a material with poor releasability, it is necessary to apply a mold release agent to the molding surface in advance to make it easy to take out the molded object after molding. There is a problem that the preparation work is complicated.

Purpose of the Invention This invention has been made to solve the above-mentioned problems, and the first invention is that even when molding is performed using a material with poor releasability,
The object of the present invention is to provide a molding die that does not require applying a mold release agent to the molding surface of the mold and does not require troublesome preparation work. The object of the second invention is to provide a molding die capable of exuding a mold release agent onto a molding surface with less flow resistance.

Structure of the Invention In order to achieve the above-mentioned object, the first invention provides a mold part that constitutes a molding surface in which a plurality of through holes are transparently provided in the thickness direction of the mold part, and a back surface of the mold part. a release agent exuding member provided in the mold release agent for exuding the impregnated mold release agent onto the molding surface through the through hole;
and a mold release agent supply means for communicating with the mold release agent exuding member and supplying the mold release agent to the mold release agent exuding member. A mold part constituting a molding surface in which a plurality of through holes, which increase and a release agent exuding member for causing the mold release agent to exude onto the surface of the molded part.

Embodiment An embodiment embodying the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes the entire mold for molding a steering wheel, which consists of an upper mold body 1a and a lower mold body 1b. Incidentally, since the upper mold body 1a and the lower mold main body 1b have the same structure, only the lower mold main body 1b will be described in this embodiment for convenience.

Reference numeral 2 denotes a mold part constituting the molding surface of the lower mold body 1b, which has a semicircular cross-sectional shape (see FIG. 1) and an annular planar shape (see FIG. 2). This mold portion 2 is formed separately from the lower mold body 1b by an electroforming method to be described later, and is fixed to the lower mold body 1b so that its molding surface is exposed from the upper surface of the lower mold body 1b. Reference numeral 3 denotes a large number of through holes formed straight through the same-shaped portion 2 in the thickness direction thereof. The through hole 3 is formed so that its diameter gradually increases from the molding surface of the mold part 2 toward the back surface, and the maximum diameter is approximately 0.1 to 0.2 mm, and the minimum diameter is not particularly determined. The smaller the size is, the more preferable it is, as long as it is large enough to allow the release agent (described later) to pass therethrough. Furthermore, in this type of mold, the diameter of the through hole 3 is made smaller,
If the number of pieces is increased, the molding process can be easily performed.

Reference numeral 4 denotes a release agent exuding member disposed along the back surface of the mold portion 2 within the lower mold body 1b, and is made of a highly hygroscopic material such as sponge or sponge. The release agent exuding member 4 is impregnated with a release agent to be described later, and as shown in FIG. ing. Reference numeral 6 denotes an annular opening formed on the upper surface of the holding member 5 so as to correspond to the mold part 2, both peripheral edges of which are fixed to both peripheral edges of the mold part 2, and the holding member 5 is With the upper surface exposed from the lower mold body 1b, the mold part 2
is immovably attached to the

Reference numeral 7 denotes a supply pipe extending outwardly from the holding member 5 through the lower mold body 1b, and the base end of the supply pipe 7 is communicated with the release agent exuding member 4 within the holding member 5. The tip is the lower mold body 1b
Externally it is connected to a reservoir 9 via a feed pump 8 .

Note that a liquid release agent such as silicone oil, liquid natural wax, liquid synthetic wax, etc. is stored in the storage tank 9. This storage tank 9, together with the supply pipe 7 and the supply pump 8, forms a mold release agent supply means for supplying the mold release agent to the mold release agent exuding member 4.

Next, before describing the electroforming method for manufacturing the mold part 2, a normal electroforming method will be described, and here, electroforming is referred to as plating in a broad sense.

Generally, the plating method involves spraying a conductive coating film, such as a spray liquid formed by mixing a paste silver lacquer and a butyl acetate solution, onto the plating material to impart conductivity to the plating material. A pretreatment liquid made by mixing hydrochloric acid and stannous chloride in pure water is applied with a brush, etc., to activate the surface of the plating material and perform pretreatment to prevent pinholes from forming. There is.

In addition, the coating liquid is nickel sulfamate liquid,
After mixing boric acid, a small amount of sodium lauryl sulfate, for example, is added as a surface active additive. This sodium lauryl sulfate prevents pinholes from forming in the plating layer on the surface of the plating material during plating processing.

After this, the plating material and the plating material are immersed in the plating liquid stored in the plating liquid tank, the plating liquid is circulated, the cathode locker is operated, and the plating material is further moved in the plating liquid to generate pinholes. About 100cm ³ of the plating material between the plating material and the plating material while preventing
A current of 0.6 A is passed for 3 to 4 hours to ensure that the plating layer adheres to the entire surface of the plating material. After confirming that the plating layer has been adhered, convert the current to 1 to 2 ^A per 100cm3 of the plating material, continue plating so that the plating layer is smooth, finish it in the desired shape, and then continue plating the plating material. The molded part 2 is formed by separating the plating layer and the plating layer. Note that if the current is made stronger than the above value, pinholes will occur on the surface of the plating material.

In the above-mentioned plating method, the generation of pinholes in the mold part 2 is prevented, but in this invention, the generation of pinholes is promoted by the following method,
This pinhole is made to grow into a through hole 3. That is, (1) Do not add surface active additives such as sodium lauryl sulfate to the plating solution.

(2) Before the plating process, a lacquer solution mixed with an insulating material such as vinyl chloride is sprayed onto the plating material to form a tank of approximately 15 μm to reduce the electrical conductivity of the surface of the plating material.

(3) Do not use pre-treatment liquid in pre-treatment of plating materials.

(4) When plating, do not circulate the plating liquid,
Furthermore, the cathode rocker is also kept stationary.

(5) A stronger current than usual is passed during plating.

At least one of these
It is possible to form the through holes 3 in the mold part 2 by only one method.

Now, how to use the molding die configured as described above will be described below.

First, the supply pump 8 is activated to send the mold release agent in the storage tank 9 to the mold release agent exuding member 4 through the supply pipe 7, and the mold release agent exuding member 4 is impregnated with as much mold release agent as it can hold. . Next, the supply pump 8 is operated weakly again to send a small amount of mold release agent to the mold release agent exuding member 4, and at the same time, when a slight pressure is applied to the mold release agent impregnated in the mold release agent exuding member 4, the mold release agent is released. The mold agent is a mold release agent exuding member 4
It oozes out from. This oozing mold release agent enters the through hole 3 of the mold part 2 by capillary action and the pressure that promotes this, and reaches the molding surface. Therefore, the molding surface is in the same state as if the mold release agent had been applied. As mentioned above, the through hole 3 is cut straight through the mold part 2 in the thickness direction, so there is little risk of clogging, and since the diameter becomes larger toward the back of the mold part 2, it is easier to release the mold. The flow resistance encountered by the agent as it enters the through hole 3 is very small.

Once the mold release agent oozes out over the entire molding surface, the molded object can be easily peeled off from the mold portion 2 even if molding is performed using a material with poor peelability. By using the mold 1 in this manner, it is possible to exude a desired amount of mold release agent into the mold portion 2 depending on the material of the object to be molded.

Note that once the molding process is performed using this mold 1, if a small amount of mold release agent is sent to the mold release agent exuding member 4, the mold release agent will ooze out onto the molding surface, so that the mold 1 cannot be re-molded. Ready for use.

In addition, although only one supply pump 8 is shown in the drawing, in order for the release agent to be evenly impregnated into the release agent exuding member 4, a plurality of supply pumps 8 are arranged at equal distances. It is desirable that

Moreover, as mentioned above, the upper mold body 1a of the mold 1
and the lower die main body 1b have exactly the same configuration,
The upper mold body 1a is also used in the same manner as the lower mold body 1b.

Note that the present invention is not limited to the above-mentioned embodiments, and, for example, the mold portion 2 may be formed into a different shape depending on the shape of the object to be molded, or the mold portion 2 may be formed by casting, cutting, etc. Any changes can be made without departing from the spirit of the invention, such as by drilling the through holes 3 with a laser beam, a cone with a narrow tip, or by creating a porosity.

Effects of the Invention As detailed above, the first invention of the present application includes a mold part that constitutes a molding surface in which a plurality of through holes are transparently provided in the thickness direction of the mold part, and a back surface of the mold part. a mold release agent exuding member provided in the mold release agent for exuding the impregnated mold release agent onto the molding surface through the through hole; and a mold release agent exuding member communicated with the mold release agent exuding member to supply the mold release agent to the mold release agent exuding member. By simply applying pressure to the release agent exuding member impregnated with the release agent through the release agent supply means, the release agent is released through the through holes. As it reaches the molding surface,
Even when molding is performed using materials with poor releasability, unlike conventional methods, the troublesome preparation work of applying a mold release agent to the molding surface of the mold beforehand can be eliminated, and once the molding If the mold release agent supply means is operated even after processing, the mold release agent will ooze out onto the molding surface, making it possible to prepare the mold for reuse.Moreover, the operation of the mold release agent supply means can be adjusted. In this case, a desired amount of mold release agent can be exuded onto the molding surface according to the material of the molded object, and since the through hole is provided almost straight in the thickness direction of the mold part, there is no risk of clogging. In addition, the second invention provides a mold part that constitutes a molding surface in which a plurality of through holes whose diameters increase from the molding surface to the back surface are transparently provided substantially straight in the thickness direction of the mold part. and a release agent exuding member provided on the back surface of the same mold part for exuding the impregnated mold release agent onto the surface of the molded part through the through hole, thereby reducing the risk of clogging in the through hole. Not only can the mold release agent be reduced, but also the flow resistance experienced when the mold release agent oozes into the through-holes can be made very small, resulting in the excellent effect that the mold release agent can ooze out onto the molding surface with less resistance.

[Brief explanation of drawings]

In the drawings, FIG. 1 is a sectional view embodying the molding die of the present invention, and FIG. 2 is a perspective view showing the main parts of the lower mold. Mold part that constitutes the molding surface...2, Through hole...3,
Release agent exuding member...4, supply pipe...7, supply pump...8, storage tank...9 (The supply pipe 7, supply pump 8, and storage tank 9 constitute a release agent supply means. ing).

Claims (1)

[Scope of Claims] 1. A mold part 2 that constitutes a molding surface in which a plurality of through holes 3 are transparently provided substantially straight in the thickness direction of the mold part 2.
a release agent exuding member 4 provided on the back surface of the mold portion 2 for exuding the impregnated mold release agent onto the molding surface through the through hole 3; A molding die characterized by comprising release agent supply means 7, 8, and 9 for supplying a release agent to the release agent exuding member 4. 2. The molding die according to claim 1, wherein the release agent exuding member 4 is made of a highly hygroscopic material. 3. The molding die according to claim 1, wherein the release agent exuding member 4 is housed in a holding member 5 formed of a metal plate or the like in a substantially annular shape. 4. The release agent supplying means was connected to the supply pipe 7 through the supply pipe 7 that communicated with the release agent exuding member 4, the supply pump 8 attached to the supply pipe 7, and the supply pump 8. The molding die according to claim 1, further comprising a reservoir tank 9 for storing a mold release agent. 5 A mold part 2 constituting a molding surface in which a plurality of through holes 3 whose diameter increases from the molding surface to the back surface are transparently provided almost straight in the thickness direction of the mold part 2, and a back surface of the same mold part 2. A molding die characterized by comprising a release agent exuding member 4 for exuding the impregnated mold release agent onto the molding surface through the through hole 3.