JP2832782B2 - Liquid silicone rubber injection molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid silicone rubber injection molding apparatus.

[0002]

2. Description of the Related Art As a liquid silicone rubber injection molding apparatus, there has conventionally been an apparatus shown in FIG.

[0003] In this apparatus, a tank b containing a first base material a comprising a base polymer, a catalyst and a filler is provided.
A tank d containing a second main agent c composed of a base polymer, a crosslinking agent, a control agent, and a filler; a tank f containing a bleed agent and a color agent e; a fixed-rate discharge pump g; , F, each agent a, c, e dispensing pump g
And a cylinder i to which the agents a, c, and e are supplied from the fixed-rate discharge pump g.

[0004] That is, each agent a, from each tank b, d, f
c and e are supplied to a fixed amount discharge pump g by a raw material pressure pump h. From the pump g, fixed amounts of each of the agents a, c and e are sent to a cylinder i, and each of the agents a, c and e is screwed by j.
Is injected from a nozzle k into a mold.

[0005]

Accordingly, each of the agents a, c,
When e is changed, the raw material pressure pump h and the hose m to the fixed discharge pump g are changed, and the fixed discharge pump g, the mixing cylinder i, the screw j, the injection nozzle k and the like are disassembled and cleaned. And the work was extremely cumbersome and required a long time.

In addition, a raw material pressure pump h is required for each of the tanks b, d, and f, which increases the size of the entire apparatus and increases the cost.

Further, the raw material remaining in the fixed-rate discharge pump or the like is extruded as it is and is discarded, causing a large amount of loss.

Accordingly, an object of the present invention is to provide a liquid silicone rubber injection molding apparatus capable of changing raw materials easily and in a short time.

[0009]

In order to achieve the above-mentioned object, a liquid silicone rubber injection molding apparatus according to the present invention forms a liquid silicone rubber by vacuum defoaming mixing of a silicone base and a crosslinking agent. A can body for detaching the can body, a material pushing mechanism for detachably mounting the can body to push out the liquid silicone rubber in the can body out of the can body, and a detachably attached to the molding press machine and pushing out of the can body. Measuring cylinder to which the liquid silicone rubber is supplied, an injection cylinder mechanism for extruding the liquid silicone rubber in the measuring cylinder into a mold of a molding press, and cooling the liquid silicone rubber in the can body and the measuring cylinder. And a cooling mechanism.

[0010]

The liquid silicone rubber can be supplied from the can body to the measuring cylinder via the raw material pushing mechanism, and the rubber can be extruded into the mold of the molding press via the injection cylinder mechanism.

However, since the rubber in the can and the measuring cylinder is cooled by the cooling mechanism, the vulcanization is not performed in the can and the measuring cylinder, and the rubber does not solidify. Therefore, the rubber (raw material) can be reliably injected into the mold.

When the liquid silicone rubber is to be changed, the can is replaced with a can containing the rubber to be changed, and the measuring cylinder is replaced with a new (or one for the rubber to be changed). What is necessary is just to replace it with a measuring cylinder.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a liquid silicone rubber injection molding apparatus according to the present invention. This apparatus comprises a molding press 2 provided with a mold 1 and a can 3 containing liquid silicone rubber S as a raw material. And a pushing mechanism 4 to which the can 3 is attached, a measuring cylinder 5 to which the rubber S in the can 3 is supplied via the pushing mechanism 4, and a rubber S in the measuring cylinder 5 into the mold 1. An injection cylinder mechanism 6 for extruding, a separating cylinder mechanism 7 for separating the nozzle at the lower end of the measuring cylinder 5 from the mold 1 (when no injection is performed), and a cooling mechanism for cooling the can 3 and the rubber S in the measuring cylinder 5. 8 is provided.

Thus, the pushing mechanism 4 includes a base 9 on which the can 3 is placed, a cooling water jacket 10 disposed around the can 3 placed on the base 9, A follower plate 11 placed on the rubber upper surface in the can body 3;
And a cylinder mechanism 12 for moving the cylinder up and down.

That is, the cylinder mechanism 12 is driven to drive the plate
When the rubber 11 is pushed down, the rubber is pushed out of the can 3 through the pipe 13.

Reference numeral 14 denotes a sealing material.

Thus, the liquid silicone rubber S (as shown in FIG. 2) is prepared by mixing two liquids of the silicone base 15 and the crosslinking agent C.

In a simplified manner, the above-described first conventional device will be described.
Instead of the method of mixing the three liquids consisting of the main agent a, the second main agent c, and the color agent e, a component obtained by removing only the crosslinking agent from the second main agent c, and the first main agent, The pre-mixed material is used as a silicone base 15, and the silicone base 15 is mixed with the crosslinking agent C to produce a liquid silicone rubber S (by mixing two liquids) (see FIG. 2).

That is, as shown in FIG. 3, the can 3 into which the base material 15 and the crosslinking agent C are mixed is put into a vacuum defoaming mixer 16 and both can be sufficiently mixed by vacuum defoaming. .

The measuring cylinder 5 comprises a cylindrical body having a ram 24 and a holding piece 17. The holding piece 17 is held by the separating cylinder mechanism 7, and the measuring piece 5 is injected into the hot mold 1 only at the time of injection. Unnecessary crosslinking is prevented by contacting the lower end nozzle of the cylinder 5.

The separation cylinder mechanism 7 has a cylinder body 18 attached to an upper platen 21 of the press machine 2 and a rod 19 provided with a clamp 20.

That is, the holding piece 17 of the measuring cylinder 5 is detachably held by the clamp portion 20, and the measuring cylinder 5 is moved in the axial direction by the reciprocating movement of the rod 19.

The injection cylinder mechanism 6 includes an upper platen.
A cylinder body 23 is attached to a holding frame 22 erected on 21, and its rod 34 pushes down a lower ram 24.

Accordingly, the rubber S supplied into the measuring cylinder 5 by the pushing mechanism 4 is pushed into the mold 1 by pushing down the rod 34 of the injection cylinder mechanism 6.

In FIG. 1, reference numeral 25 denotes a flexible pipe for communicating and connecting the pipe 13 with the measuring cylinder 5;
Is a valve, and 27 is a check valve, which sucks liquid silicone rubber from the can body 3 when the ram 24 is raised.

Next, the cooling mechanism 8 comprises a cooling water circulating device, and supplies a pipe (hose) 28 for supplying cooling water to the cooling water jacket 10 of the pushing mechanism 4 and supplies cooling water to the peripheral wall of the measuring cylinder 5. (Pipe (hose) 29).

That is, the cooling water supplied from the cooling mechanism 8 keeps the rubber S in the can 3 and the measuring cylinder 5 at about 10 ° C., for example.

Thus, the silicone base 15 and the crosslinking agent C
Silicone rubber S obtained by vacuum defoaming mixing
Is hardly vulcanized and solidified when it is kept at about 10 ° C. (specifically, it does not solidify for about 47 hours), and the rubber S in the can body 3 and the measuring cylinder 5 is surely solidified without being solidified. It can be extruded into the mold 1.

On the other hand, in a high temperature state, it is vulcanized and solidified within a few seconds.

Next, a method of using the liquid silicone rubber injection molding apparatus configured as described above will be described.

First, as shown in FIGS. 2 and 3, a liquid silicone rubber S is produced by mixing two liquids, and the can 3 containing the rubber is inserted into a pushing mechanism 4 as shown in FIG. Mounting.

That is, the can 3 is placed on the base 9 and the follower plate 11 is placed on the upper surface of the rubber.

Then, the rubber S in the can 3 is sucked into the measuring cylinder 5 by raising the ram 24 (similar to a water gun).

The measuring cylinder 5 is controlled by the cylinder mechanism 7.
, The nozzle is pressed against the mold 1, the rubber S sucked into the measuring cylinder 5 is extruded into the mold 1 by the injection cylinder mechanism 6, and the rubber S is injected into the mold 1. .

When it is desired to perform injection molding with rubber S having a different color or rubber S having a different compounding ratio, the currently mounted can body 3 is removed from the pushing mechanism 4 and
Next, the can body 3 containing the rubber S to be used is pushed into the mechanism 4.
And the currently mounted measuring cylinder 5
Is removed from the press 2 and a new measuring cylinder 5 is removed.
May be attached to the press machine 2. Of course, it is also preferable to replace the flexible pipe 25.

Therefore, the raw material liquid silicone rubber S
Can be changed in a very short time and easily.

Further, there is almost no loss of raw materials, and it is economical.

[0039]

Since the present invention is configured as described above, the following effects can be obtained.

The liquid silicone rubber S, which is a raw material, can be replaced easily and in a short time (about 10 minutes), and the working efficiency is greatly improved. That is, it is suitable for various kinds of small-scale production of silicone rubber products such as sealing materials.

Further, since the can body 3 and the measuring cylinder 5 are detachable, cleaning and cleaning thereof can be easily performed.

In addition, there is an advantage that there is almost no loss of raw materials and that the system is economical.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a method for producing a liquid silicone rubber.

FIG. 3 is a simplified diagram of a vacuum defoaming mixer.

FIG. 4 is a simplified view of a conventional liquid silicone rubber injection molding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Molding press 3 Can body 4 Pushing mechanism 5 Measuring cylinder 6 Injection cylinder mechanism 7 Cylinder mechanism for separation 8 Cooling mechanism 15 Base C Crosslinking agent S Liquid silicone rubber

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ identification code FI B29K 105: 24 (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/00-45/84 B29C 31/00 -31/10

Claims (1)

(57) [Claims] 1. A can body for forming a liquid silicone rubber by vacuum defoaming mixing of a silicone base and a cross-linking agent, and a liquid silicone rubber in which the can body is removably mounted and which is contained in the can body. A material pushing mechanism that pushes the material out of the can,
A measuring cylinder detachably mounted on the molding press and supplied with the liquid silicone rubber extruded from the can body; and an injection cylinder for extruding the liquid silicone rubber in the measuring cylinder into a mold of the molding press. A liquid silicone rubber injection molding device comprising: a mechanism; and a cooling mechanism for cooling the liquid silicone rubber in the can body and the measuring cylinder.