JPH0536652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vulcanization jig for holding an unvulcanized rubber hose in a vulcanization device such as a vulcanization pot.

[Conventional technology]

BACKGROUND OF THE INVENTION Bent rubber hoses used in automobiles and the like are formed by vulcanization in a vulcanization pot or the like while holding a short unvulcanized rubber hose using a vulcanization jig.

Such vulcanization jigs include, for example, a columnar base metal having a center hole in the axial direction and one end fixed to a frame in the vulcanization device, and a base metal with one end inserted into the center hole of the base metal and fixed. A vulcanizing jig consisting of a curved core metal and a substantially cylindrical cap that is arranged concentrically around the core metal protruding from the base metal and has one end fixed to the base metal or the other end of the core metal. tools are commonly used.

The unvulcanized rubber hose is inserted by being pushed from the other free end of the core metal until one end of the hose contacts the base metal. Since unvulcanized rubber hoses are soft, they tend to bend and swell in outer diameter when one end comes into contact with the base metal, but by regulating the outer circumference of one end with a cap, a predetermined outer diameter can be guaranteed.

However, in conventional vulcanization jigs, the cap was made of opaque iron or the like, so it was impossible to visually determine whether the unvulcanized rubber hose was pushed inside the cap until it came into contact with the base metal. They were unable to do so and relied on the intuition and skill of the workers. In particular, when the core metal is bent to make a curved hose, it is necessary to push the unvulcanized rubber hose until it contacts the base metal in order to obtain a curved hose with the specified bending shape. After the rubber hose is removed after curing, it must be inspected using a special inspection mold to determine whether it conforms to the standards, that is, whether the unvulcanized rubber hose was pushed in correctly until it touches the base metal. I didn't understand.

In particular, unvulcanized rubber hoses are soft, so they can stretch in the length direction due to resistance when pushed into the core metal, or conversely bend and contract. In some cases, the results were not obtained.

For this reason, after vulcanization, remove the rubber hose from the core metal,
The size and shape must be inspected one by one by applying it to an inspection mold, and there is a problem in that such inspection requires a lot of time and effort.

[The problem that the idea attempts to solve]

In view of such conventional circumstances, the present invention has been developed to make it easy to visually check whether the unvulcanized rubber hose is inserted into the core metal at the correct position and whether it is stretched or contracted in the length direction. To provide a jig for vulcanizing a rubber hose that can be used to confirm the suitability of the dimensions and shape of a vulcanized rubber hose while being inserted into a metal core immediately after vulcanization.

[Means to solve the problem]

In order to achieve the above object, the rubber hose vulcanization jig of the present invention includes a column-shaped base metal having a center hole in the axial direction and one end of which is installed in the vulcanizer, and one end inserted into the center hole of the base metal. a core metal into which an unvulcanized rubber hose is inserted and fixed, and a substantially cylindrical transparent cap that is arranged concentrically around the core metal protruding from the base metal and has one end fitted to the other end of the base metal. The core metal is characterized by having heat-resistant strip-shaped parts of different colors that are different in color from other parts formed at the respective locations where both ends of the rubber hose after vulcanization are to be located.

It goes without saying that the transparent cap must be made of a material that can withstand the vulcanization temperature, and therefore may be made of plastic or glass as long as it has heat resistance above the vulcanization temperature.

The heat-resistant band-shaped different color parts may be formed by combining metal layers of different colors, such as Cr and CrN, so that one part is in the form of a band and the other part is the other part, by means of vapor deposition. In addition, the interval and width of the two strip-shaped different color sections are set so that if both ends of the rubber hose after vulcanization are within the respective strip-shaped different color sections, the curved shape and dimensions of the rubber hose will be within the standard range.

〔Example〕

A specific example of the present invention will be explained with reference to the drawings.

This rubber hose curing jig consists of a columnar base metal 1 having a center hole 4 in the axial direction, a core metal 2 whose one end is inserted into the center hole 4 of the base metal 1 and fixed, and a core metal 2 protruding from the base metal 1. It consists of a substantially cylindrical transparent cap 3 arranged concentrically around a metal core 2.

Transparent cap 3 is polymethylpentene (melting point
220 to 235°C), and has two protrusions 5 diagonally on the inner periphery of one end.

On the other hand, one end of the base metal 1 is a mounting part 6 for mounting inside the vulcanizer, and can be screwed into a frame, etc. inside the vulcanizer with a screw part (not shown) as usual. There is. The other end of the base metal 1 is a fitting part 7 having an outer diameter slightly smaller than the inner diameter of the transparent cap 3, and a collar part 8 protruding in the circumferential direction is provided between the fitting part 6 and the fitting part 7. be. Further, two notches 9 are formed in the axial direction on the outer periphery of the other end of the fitting part 7 so that the two protrusions 5 of the transparent cap 3 can pass therethrough, and furthermore, two notches 9 are formed in the axial direction so that the two protrusions 5 of the transparent cap 3 can pass therethrough. A circumferential groove 10 is provided in the circumferential direction, and the protrusion 5 of the transparent cap 3 can move within the circumferential groove 10.

In addition, on the outer periphery of the core bar 2, two strip-shaped different colored parts 12 are provided at a predetermined interval with Cr vapor-deposited on them, and the other outer periphery parts are ground-colored parts 12 with CrN vapor-deposited, which is darker than Cr. 13. For example, when manufacturing a vulcanized rubber hose with dimensions of 400 mm ± 10 mm after vulcanization, the interval and width of the two strip-shaped differently colored portions 12 are determined by the outer lines 12a, 1 of the strip-shaped differently colored portions 12.
2d may be set to 410 mm, and the distance between both inner lines 12b, 12c of both strip-shaped different color portions 12 may be set to 390 mm.

[Effect]

In the rubber hose vulcanization jig of the present invention, the mounting portion 6 of the base metal 1 is fixed to the frame in the vulcanization device by means such as screws, bolts, or welding, and the transparent cap 3
After passing the protrusion 5 through the notch 9 and fitting it into the fitting part 7, it is fixed by turning it in the circumferential direction. Furthermore, the core metal 2 is inserted and fixed into the center hole 4 of the base metal 1 to a predetermined position (the position where one of the strip-shaped different color parts 12 can be seen through the transparent cap 3), thereby assembling the metal core 2.

After applying a mold release agent to the unvulcanized rubber hose 11,
The core bar 2, which is also coated with a mold release agent, is inserted from the other free end. A transparent cap 3 is fixed to the other end of the base metal 1 (the upper end of the fitting part 7), so while visually observing the unvulcanized rubber hose 11 passing through the transparent cap 3, one end 11a of the unvulcanized rubber hose 11 is It is possible to reliably push it in until it comes into the strip-shaped different color part 12 (until it comes into contact with the upper end of the fitting part 7 as the case may be). At this time, the other end 11b of the unvulcanized rubber hose 11 should be near the other band-shaped different color part 12, but if it deviates from the planned position, it may be compressed or stretched in the length direction. Alternatively, by adjusting the other end 11b by cutting it, the number of rejected vulcanized rubber hoses can be reduced.

The rubber hose after vulcanization can be passed in terms of shape and dimensions if both ends thereof are located within the respective strip-shaped different color sections 12. Therefore, before the vulcanized rubber hose is removed from the core metal, it is possible to easily and reliably determine whether the hose is acceptable or not.

In addition, the transparent cap 3 can be removed from the base metal 1 by simply moving the protrusion 5 in the circumferential groove 10 of the fitting part 7, aligning it with the notch 9, and pulling it to the opposite side of the base metal 1, and the core can be removed as it is. Since it can be moved along the metal 2 and pulled out from the other free end of the core metal 2, it is easy to disassemble and assemble when cleaning the jig. Incidentally, contrary to the above embodiment, the protrusion may be formed on the base metal, and the notch and the circumferential groove may be formed on the transparent cap.

[Effect of idea]

According to the present invention, it is possible to visually determine whether or not the insertion position is correct while inserting the unvulcanized rubber hose into the core metal through the transparent cap, thereby eliminating defective products due to incorrect insertion.

In addition, the size and shape of the curved hose can be determined by visually checking whether the rubber hose after vulcanization conforms to the specified dimensions and shape immediately after vulcanization while it is still inserted into the vulcanization jig. Since the inspection can be performed easily, the inspection time can be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a specific example of the rubber hose vulcanization jig of the present invention, and FIG.
The figure shows a plan view of the base metal, and FIG. 2b shows its side view. 1...Base metal, 2...Core metal, 3...Transparent cap, 4...Center hole, 5...Protrusion, 6...Mounting part,
7...Fitting part, 8...Brim part, 9...Notch, 10
... Circumferential groove, 11 ... Unvulcanized rubber hose, 12 ...
Band-shaped different color part, 13... Ground color part.

Claims (1)

[Scope of utility model registration request] A column-shaped base metal having a center hole in the axial direction and one end of which is attached to the vulcanizer, a core metal into which an unvulcanized rubber hose is inserted and fixed by inserting one end into the center hole of the base metal, and the base metal. It consists of a roughly cylindrical transparent cap that is arranged concentrically around a core metal that protrudes from the metal, and one end of which is fitted onto the other end of the base metal.Both ends of the rubber hose after vulcanization should be placed on the core metal. A jig for curing a rubber hose, characterized by forming heat-resistant band-shaped parts of different colors in each part, which are different in color from other parts.