JPH0722940B2 - Mold for manufacturing composite seal ring - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold for manufacturing a composite seal ring.

[Conventional technology and its problems]

Conventionally, when manufacturing a composite seal ring in which a rubber elastic ring is covered with a fluororesin coating layer, a circular ring-shaped rubber elastic ring is manufactured, and then the upper and lower surfaces of this rubber elastic ring are halved. A circular ring-shaped fluororesin-coated half body having an arc-shaped cross section is coated to form a composite seal ring forming material, and the composite seal ring forming material is loaded into a mold and pressure-heat molded. , A method of forming the joined surfaces of the half-divided bodies by fusing, and inserting a fixed-size linear body made of a rubber elastic body into a fluororesin tube to form a composite seal-ring forming material. Similarly, there is a method in which both end surfaces of a fluororesin tube are fused and formed by loading in a mold and heating under pressure.

However, in this case, since the mold device as shown in FIG. 9 was used, the defective rate of the product was high. That is, this mold device includes upper and lower molds a and b, and the lower mold b is a material e for forming a composite seal ring (in this case, a rubber elastic ring c).
And a fluororesin half body covering the rubber elastic ring c
and a coating layer m composed of d. ) Has a fitting groove f into which the lower half part is fitted, and a small groove g recessed near the inner and outer peripheral edges of the fitting groove f, and the upper die a is the composite seal. It has a fitting groove h into which the upper half part of the ring forming material e is fitted. Then, with the lower half of the composite seal ring forming material e fitted in the fitting groove f, the heated upper and lower molds are brought close to each other to melt the half halves d, d, As shown in the drawing, the composite seal ring forming material e was cooled under pressure, and the halves d and d were fused and integrated with the coating layer m, thereby forming a composite seal ring.

Therefore, the resin flows out from the cavity k formed by the fitting grooves f and h along the mating surfaces of the upper and lower molds a and b. It was difficult to manufacture a non-defective product because the pressure, the heating or pressurizing time, the volume of the halves d, d, etc. were very severely limited.

Therefore, an object of the present invention is to provide a metal mold for manufacturing a composite seal ring, which can solve such problems of the related art, can be manufactured simply and quickly, and can reduce the defective rate. .

[Means for solving problems]

A mold for producing a composite seal ring of the present invention is a rubber elastic ring having an integrated or cut portion, which is covered with a coating layer made of a fluororesin having a cut portion, to cut the coating layer of a material for forming a composite seal ring. A die for manufacturing a composite seal ring, which comprises fusion-bonding parts to form a composite seal ring; a ring groove having a substantially rectangular cross section is formed on an upper surface, and the ring groove is formed at the center of the bottom surface of the ring groove. A lower mold having a fitting groove into which the lower half of the material for forming the composite seal ring is fitted; and a cross section of the lower surface that is fitted loosely into the ring groove of the lower mold. A rectangular ring-shaped hanging wall is formed, and a fitting groove into which the upper half of the composite seal ring-forming material is fitted is formed in the lower surface center part of the ring-shaped hanging wall. A cavity is formed by the fitting groove and the fitting groove of the lower mold. And a; in state, the upper mold to form a minute gap portion of the cross section substantially L-shape from both the inside and the outside end is communicatively connected to the each above the cavity.

[Action]

With the above structure, the lower half of the composite seal ring forming material is fitted in the fitting groove of the lower mold, and the heated lower mold and upper mold are brought close to each other to The ring-shaped hanging wall of the mold is loosely fitted into the ring groove of the lower mold, the coating layer is melted, and the upper and lower molds are pressurized and cooled. Flows into the minute gap and enters the cavity formed by the fitting grooves of the upper and lower molds.
A composite seal ring having an integral coating layer is formed. Therefore, since the fluororesin flows into the minute gaps, the composite seal ring forming material is always under pressure, and no bubbles or the like are generated inside.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating examples.

FIG. 1 is an enlarged cross-sectional view of a main part of a mold for manufacturing a composite seal ring according to the present invention. This mold includes upper and lower molds 6 and 7, and as shown in FIG. The cutting part 2
The cut portion 2 of the composite seal ring forming material 4 which is covered with the fluorocarbon resin coating tank 3 having
The composite seal ring 5 is formed. Further, in this case, the coating layer 3 is composed of circular ring-shaped half bodies 3a and 3b having a half arc cross section, and the half bodies 3a and 3b are fitted to the rubber elastic ring 1 from above and below. Then, the composite seal ring forming material 4 is formed.

Thus, in the lower mold 7, a ring groove 9 having a substantially rectangular cross section is formed on the upper surface 8, and the lower half portion of the composite seal ring forming material 4 is formed at the center of the bottom surface of the ring groove 9. A fitting groove 10 for fitting is formed. Specifically, the lower mold 7 is composed of a lower member 11 and an upper member 12, a ring-shaped protrusion 13 having a substantially rectangular cross section is formed on the upper surface 11a of the lower member 11, and the protrusion is formed. The ring member 9 is formed by detachably fitting the upper member 12 into the circular recess 14 in the portion 13 or the recess 15 between the protrusions 13. A fitting groove 10 is formed at the center of the upper surface of the protrusion 13.

Further, the upper mold 6 is formed with a ring-shaped hanging wall portion 16 having a substantially rectangular cross section which is fitted into the ring groove 9 of the lower mold 7 in a loose fit manner. A fitting groove 17 into which the upper half of the seal ring forming material 4 is fitted in the center of the lower surface.
Are formed. That is, the width dimension A of the ring groove 9 is set to be slightly larger than the width dimension B of the ring-shaped hanging wall portion 16, and the upper and lower molds 6 and 7 are brought closer to each other as shown in FIG. When the cavity 18 is formed in the grooves 10 and 17, the lower surface of the ring-shaped hanging wall portion 16 and the ring-shaped protruding portion 13 are formed.
It is set so that a slight gap is generated between the upper surface of the and.
Therefore, in the state in which the cavity 18 is formed by both the fitting grooves 10 and 17, the minute gap portions 19 and 19 having a substantially L-shaped cross section which are connected and communicated upward from both inner and outer end portions of the cavity 18, respectively.
Is formed.

Next, a method for manufacturing a composite seal ring using this mold for manufacturing a composite seal ring will be described.

As shown in FIG. 3, the half body 3b of the composite seal ring forming material 4 is fitted in the fitting groove 10 of the lower mold 7, and the rubber elastic ring 1 is fitted in the half body 3b. Further, after fitting the half-split body 3a to the rubber elastic ring 1, as shown in FIG. 4, the lower die 7 and the upper die 6 are brought close to each other to form the half-split body 3a. And the upper and lower molds 6 and 7 which are heated by a heating plate (not shown) attached to the upper molds 6 and 7 are fitted in the fitting grooves 17 of the upper mold 6 and both halves. After melting the split bodies 3a, 3b, the upper and lower molds 6, 7 are brought closer to each other and cooled, and as shown in FIG. The coating layers 3 are integrated by fusing the 3a and 3b, and the composite seal ring 5 is formed in the cavity 18.

Therefore, in this case, when pressurizing and cooling the upper and lower molds 6, 7,
Since the resin has flowed into the minute gap portions 19, 19, pressure is constantly applied to the composite seal ring forming material 4, and no bubbles are generated inside the integrated coating layer 3.

Also, after forming the composite seal ring 5, upper and lower molds 6,7
Are separated from each other, the internal and external scraps 20 and 21 formed by flowing into the minute gaps 19 and 19 have a substantially L-shaped cross section, so that the composite seal ring 5 to the internal and external scraps 20 and 2 are formed.
1 is in close contact with the upper mold 6, and as shown in FIG.
At the same time, it is separated from the lower mold 7, and the composite seal ring 5 can be easily removed from this mold. Further, in this case, since the lower mold 7 is composed of the upper and lower members 12 and 11, the composite seal ring 5 can be more easily removed by disassembling the upper and lower members 12 and 11.

Next, FIG. 6 shows another embodiment, in this case, the lower mold 7
Are used as one body, and the other parts are the same as those in the above-mentioned embodiment. Therefore, also in this case, the composite seal ring 5 can be formed from the seal ring forming material 4 as in the above-described embodiment.

Further, FIG. 7 shows still another embodiment. In this case, the lower mold 7 is the same one as that shown in FIG. 6, and the cavity 18 has a substantially square cross section. Is similar to the above-mentioned embodiment. That is, in this case, the composite seal ring forming material 4 is composed of a rubber elastic ring 1 having a substantially square cross section and half halves 3a and 3b (not shown) having a substantially concave cross section. The fitting grooves 10 and 17 each have a substantially rectangular cross section. Therefore, in this case, the composite seal ring 5 having a substantially square cross section can be formed.

In the above-mentioned embodiment, the composite seal ring forming material 4 formed by the rubber elastic ring body 1 and the half-divided bodies 3a, 3b was used. However, as shown in FIG. Of course, it is also preferable to use the seal ring forming material 4.
That is, in this material 4, the rubber elastic body 1a made of a linear body cut to a predetermined size is inserted into the tubular coating layer 3 made of fluororesin so that both ends of the coating layer 3 are butted against each other. The whole is formed in a ring shape. In this case, it is preferable that the abutting surfaces 22 at both ends of the rubber elastic body 1a are provided in the coating layer 3 as shown in the figure. The butted portion of the coating layer 3 is the cut portion 2.

The present invention is not limited to the illustrated embodiment, and the setting can be freely changed without departing from the gist of the present invention. For example, the formed composite seal ring 5 is not limited to a circular or square cross section, and may be an ellipse or a multiplicity. It is also free to make different shapes such as prismatic. In this case, of course, the cross-sectional shapes of both fitting grooves 10 and 17 are set so as to correspond to the cross-sectional shape of the composite seal ring 5. Further, the number of the fitting grooves 10 and 17 formed in the upper and lower molds 6 and 7 is of course free. That is, if a large number of the fitting grooves 10 and 17 are provided, a large amount of non-defective composite seal rings 5 can be manufactured at one time, and the production rate is improved.

〔The invention's effect〕

In the die for manufacturing the composite seal ring of the present invention, when the pressure and the cooling are applied, the fluorine resin melted flows into the minute gap portions 19, 19 having a substantially L-shaped cross section, so that the composite seal ring forming material 4 is However, pressure is always applied, and bubbles and the like are not generated in the integrated coating layer 3, and even when a large amount is manufactured at one time, the number of defective products is extremely small. Further, since the rubber elastic ring 1 and the coating layer 3 are in a pressure-bonded state, the sealing material has excellent durability. Moreover, unlike the conventional case, it is not necessary to make the set temperature of the upper and lower molds, the pressure at the time of pressurization, the heating or pressurizing time, the capacity of the coating layer, etc. accurate.
A composite seal ring can be manufactured simply and quickly.

[Brief description of drawings]

FIG. 1 shows an embodiment according to the present invention and the pressurization and
FIG. 2 is an enlarged cross-sectional view of an essential part in a cooled state, FIG. 2 is a cross-sectional view of an embodiment of a material for forming a composite seal ring, and FIGS. 3, 4, and 5.
FIG. 6 is an explanatory view for sequentially explaining the manufacturing process of the composite seal ring, FIG. 6 shows another embodiment and an enlarged cross-sectional view of a main part in a pressurized / cooled state, and FIG. 7 shows another embodiment. FIG. 8 is an enlarged cross-sectional view of an essential part in the pressurized / cooled state, and FIG. 8 is a plan view of another embodiment of the composite seal ring forming material.
FIG. 9 shows a conventional example and an enlarged sectional view of an essential part before pressurization,
FIG. 10 is an enlarged cross-sectional view of essential parts in the pressurized / cooled state. 1 ... Rubber elastic ring, 2 ... Cut portion, 3 ... Coating layer,
4 ... Material for forming composite seal ring, 5 ... Composite seal ring, 6 ... Upper mold, 7 ... Lower mold, 8 ... Top surface, 9
...... Ring groove, 10,17 ...... Mating groove, 16 ...... Ring-shaped hanging wall part, 18 ...... Cavity, 19 ...... Micro gap part, 23 ...... Bottom surface.

Claims (1)

[Claims] 1. A rubber elastic ring which is integral or has a cut portion is coated with a coating layer made of a fluororesin having a cut portion, and the cut portion of the coating layer of the composite seal ring forming material is fused and fused. A mold for producing a composite seal ring for forming a composite seal ring, wherein a ring groove having a substantially rectangular cross section is formed on an upper surface, and the composite seal ring forming material is formed at a center of a bottom surface of the ring groove. A lower die having a fitting groove formed to fit the lower half portion, and a ring-shaped hanging wall having a substantially rectangular cross section which is loosely fitted in the ring groove of the lower die on the lower surface. And a fitting groove into which the upper half of the composite seal ring-forming member is fitted, is formed in the central portion of the lower surface of the ring-shaped hanging wall portion, and With the cavity formed by the fitting groove of the lower mold, Composite sealing ring manufacturing mold which is characterized by comprising the upper mold, the forming a cross section substantially L-shaped micro-gap portion from both the inside and the outside end is communicatively connected to the respective upward.