JPH0120965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a curved pipe mold.

First, an example of the use of a curved pipe mold manufactured according to the present invention will be explained based on FIGS. 1 to 3. In FIG. 1, reference numeral 1 is a cylindrical rotating type, which is supported by a plurality of wheels 2 and is rotatable around a horizontal axis 3. In FIG. Reference numeral 4 denotes a ring-shaped outer mold for a receptacle that is fitted into one end of the rotary mold 1, and 5 is a ring-shaped outer mold for a socket that is fitted into the other end of the rotary mold 1. Ring-shaped end face molds 6 and 7 are fitted into both outer molds 4 and 5, respectively. Reference numeral 8 denotes a cylindrical socket inner surface regulating device that fits inside the end face mold 6 on the socket side and is movable in the direction of the horizontal axis 3. By projecting inward with respect to the end face mold 6, the molded socket part Covers the inner peripheral surface of. Reference numeral 9 denotes a body holding mold disposed between both outer molds 4 and 5, and as shown in FIGS. 1 to 3, it has a spiral plate plate 10,
It consists of a spiral rib plate 1 continuous to the outside of the plate plate 10, and ring-shaped stops 12 and 13 welded to both ends of the plate plate 10 in the horizontal axis 3 direction. It is attached to both outer molds 4 and 5 via 13. Adjacent spiral edges of the plate plate 10 are connected by a wrap structure 14 that allows movement within a certain range in the direction of the horizontal axis 3, and the outer surface of the rib plate 11 is in contact with the inner surface of the rotary mold 1. I guess. Connector fitting portions 15 extending in the three directions of the horizontal axis are formed at appropriate positions in the circumferential direction of the rib plate 11, and the rib plate 1 is formed in the middle of the connecting portion fitting portions 15.
1 and the plate 10 are cut in the 3 directions of the horizontal axis. Further, each of the connecting fitting fitting portions 15 has a cage-like connecting fitting 17 on both sides of the cutting groove 16.
are engaged, and the respective cut ends of the rib plate 11 are connected by the connector 17. A rubber mold for the trunk 18 is laminated between the inner surfaces of the plate plate 10 and the stops 12 and 13, and the rubber mold for the trunk 18 and the trunk holding mold 9 form a curved pipe mold. Configure.

In the above configuration, centrifugal molding will be explained first. As shown in the upper half of the horizontal axis center 3 in FIG. Then, a socket portion 19 is centrifugally formed between the end face mold 6 and the socket outer mold 4. Then, as shown in the lower half of the horizontal axis core 3 in FIG. The body portion 20 is centrifugally formed over the following steps. Next, with the socket part 19 and the body part 20 in an uncured state,
Everything is taken out of the rotary mold 1 and brought into the state shown in FIGS. 2 and 3. Then, the plastically worked portion is curved so that the cutting groove 16 is on the curved upper surface side. At that time, due to the presence of both outer molds 4 and 5, the socket part 19
Deformation of the spigot portion is prevented, and intermediate curvature is facilitated by movement of the lap structure 14 between adjacent plates 10. After being curved and cured, the connector 17 is first removed. As a result, the apparent diameter of the rubber mold 18 for the trunk becomes larger, and the product can be easily extracted (demolded).

Next, a method of manufacturing the curved pipe mold used as described above will be explained. First, as shown in FIGS. 4 and 5, the plate 10 is spirally wound around the outer peripheral surface of the mandrel 21 while rotating the mandrel 21. At this time, an outwardly bent portion is formed on one of both side edges of the plate plate 10, and a groove opening inwardly is formed on the other side. Therefore, when winding, the above-mentioned wrap structure 14 is formed by fitting a groove into the bent portion. When winding further, the side edge of the winding part
It is rolled by a roller 23 urged by a spring 22. Note that the core metal 21 has a cutting groove 2 in advance.
4 is formed. Next, as shown in FIGS. 6 and 7, a pair of jigs 25 corresponding to rubber stoppers,
26 is fitted onto the core 21, and these jigs 25, 2
The winding start and winding end of the plate plate 10 are welded to 6. Then, the rib plate 11 is wound around the wound plate 10, and both are welded. Reference numeral 27 indicates a roller for regulating the position of the rib plate 11. Thereafter, as shown by phantom lines in FIGS. 8 and 9, the outer diameter of the rib plate 11 is cut with a blade 28 of a lathe. Note that a polished finish may be used. Next, as shown by the solid line in FIGS. 8 and 9, a connecting member fitting portion 15 in the axial direction is cut and formed at an appropriate position in the circumferential direction of the rib plate 11 using the first cutter 29. As shown in FIGS. 10 and 11, a second cutter 30 is provided facing the cutting groove 24, and the rib plate 11 and the plate plate 10 are disposed in the middle of the coupling fitting fitting part 15.
is cut in the axial direction by the second cutter 30 to form the cutting groove 16. Thereafter, the trunk holding mold 9 can be formed by attaching the connector 17 to the connector fitting portion 15, cutting both ends into circular slices, and welding the stops 12 and 13 to the processed ends. Next, a rubber mold 18 for the body portion is formed. That is, as shown in FIG. 12, the mold 3 is supported by a ring body 31 and rotatable around a horizontal axis 32.
The body holding frame 9 is inserted into the body 3. At this time, the socket outer mold 4 is attached to the stopper 12, and the socket outer mold 5 is attached to the stopper 13, and these 4 and 5 are inserted together. Further, fluorine oil 34 having a high specific gravity is injected into the outside of the plate 10. In this state, the mold 33
While rotating, the rubber liquid 36 is supplied from the supply pipe 35 inserted into the mold 33 toward the inner surface of the body holding mold 9 to perform centrifugal molding. At this time, the mold 33 side is equipped with a heater device, so that the centrifugally molded rubber liquid 36 is heated and hardened, thereby forming the rubber mold 18 for the body.

As described above, according to the present invention, a curved pipe mold having special functions can be easily and accurately manufactured.

[Brief explanation of drawings]

Figures 1 to 3 show an example of the use of a curved pipe forming mold, with Figure 1 being a vertical front view, Figure 2 being a front view taken out, and Figure 3 being a sectional view taken along line AA in Figure 2; 4
12 show an embodiment of the present invention, FIG. 4 is a front view when the plate is wound, FIG. 5 is a side view of the same, FIG. 6 is a front view when the rib is wound, and FIG. Fig. 7 is a side view of the same, Fig. 8 is a front view when the fitting part is formed, Fig. 9 is a side view of the same, Fig. 10 is a front view of the same when cutting, Fig. 11 is a side view of the same, and Fig. 12 is a front view of the body. FIG. 6 is a longitudinal sectional front view during molding with a rubber mold for the part. 4...Outer mold for socket, 5...Outer mold for socket, 9
...Body holding type, 10...Plate plate, 11...
Rib plate, 12, 13... Stopper, 15... Connector fitting part, 16... Cutting groove, 17... Connector,
18...Rubber mold for body, 21... Core metal, 28...
Blade, 29...first katsuta, 30...second katsuta,
33... Molding mold, 34... Futsuso oil, 36...
...Rubber liquid.

Claims (1)

[Claims] 1. Wrap the plate in a spiral around the core metal, then wind the rib plate on the wound plate, weld them together, and form the axial connector fitting part at the appropriate position in the circumferential direction of the rib plate. Next, the rib plate and the plate plate are cut in the axial direction at the middle of the connecting fitting fitting part, and after the connecting fitting is attached to the connecting fitting fitting part, both ends of the spiral plate plate in the axial direction are cut into rings. Then, stoppers are welded to both processed ends, and after these are extracted from the mandrel, a connector is attached to the connector fitting part to form a body holding mold, and this body holding mold is then molded. A method for manufacturing a curved tube mold, which comprises centrifugally molding a rubber mold for a body within the body holding mold after inserting the mold into the mold.