JPH0463771B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding device for molding packing.

[Conventional technology]

Conventionally, as a type of packing made of rubber or resin, packing A having a U-shaped cross section as shown in Fig. 3 has been known, but when this packing A is used for hydraulic purposes, the outside of the seal lips b, It is common to apply edge processing to the peripheral edge and inner peripheral edge, and the following processing procedure has been adopted. That is, as shown in Fig. 4, a molded product a' is first molded using a molding device consisting of three divided molds c, d, and e, and then the mold is opened and taken out.
The molded product a' is fitted into the shoulder part of a retainer (yatoi) f as shown in the figure. This retainer f is driven to rotate around its axis by a motor or the like (not shown), and a cutting means (not shown) such as a scalpel is moved forward and backward (in the X and Y directions) against the molded product a', thereby removing the seal lip. Cut and remove the excess material b and b to form an edge.

[Problem that the invention seeks to solve]

The packing manufacturing method according to the prior art is to produce a large amount of standardized packing a by repeating the above steps. Since the (finishing process) is separated, the manufacturing period is long, and a dedicated retainer f is required for the edge treatment process. This method is time-consuming, and for these reasons, it is difficult to manufacture inexpensive products.

In view of the above problems, the present invention simplifies the manufacturing process, shortens the manufacturing period, and provides a jig (the above-mentioned retainer).
The object of the present invention is to provide a molding device that eliminates the above steps and reduces product costs.

[Means for solving problems]

In order to achieve the above object, the molding apparatus of the present invention combines a plurality of split molds to form an annular cavity, and fills the cavity with a molding material to mold an annular packing.
One split mold, which has an annular shape and forms the bottom wall of the cavity to support the molded packing, is movable up and down relative to the other split mold, and is rotatable about its center line. .

[Effect]

In the above-mentioned molding apparatus, one split mold also serves as a conventional retainer, and after opening the mold, the next step, the edge treatment step, is performed directly, which facilitates the simplification of the manufacturing process.

〔Example〕

An embodiment of the present invention will be described below. FIG. 1 is a half-cut sectional view of a molding device (mold). The molding device 1 includes four divided molds indicated by 2, 3, 4, and 5: an upper mold, a lower mold, an inner core rod, and an outer core rod,
These split molds form an annular cavity 6 when the molds are clamped. A cylindrical portion 7 is formed to protrude downward on the lower surface of the outer core rod 5, which forms the bottom wall and the inner circumferential wall of the cavity 6, and between the base end of the cylindrical portion 7 and the lower die 3. A bearing 8 is interposed. A spring 10 that extends in the axial direction is elastically loaded between a stopper 9 attached to the outer periphery of the tip of the cylindrical portion 7 and the bearing 8, and a stopper 11 attached to the outer periphery of the lower end of the inner core rod 4.
A spring 12 that extends in the axial direction is also elastically mounted between the outer core rod 5 and the outer core rod 5. Reference numeral 13 denotes a push-up rod disposed below the inner and outer core rods 4 and 5, and is configured to be moved up and down and rotated by a drive mechanism (not shown). An engagement notch 16 formed on the lower end surface of the cylindrical portion 7 of the outer core rod 5 is provided on the upper end surface of the push-up rod 13 around the central protrusion 14 that pushes up the inner core rod 4. A mating protrusion 15 is formed.

When manufacturing the packing a shown in FIG. 3 using the molding apparatus 1, first, the molded product a' is molded in a clamped state, and then the push-up rod 13 is raised at the same time as the mold is opened, or after the mold is opened. Then, each split mold is arranged as shown in FIG. 2, and the inner and outer core rods 4 and 5 are rotated with respect to the rotation of the push-up rod 13. The molded product a' is held on the outer core rod 5, and since there is space above it and both inside and outside, a cutting means (not shown) such as a scalpel is advanced and retreated (in the X and Y directions). ), the excess material is cut and removed to form an edge.

〔Effect of the invention〕

As explained above, the molding apparatus of the present invention is for edge-processing a molded product while the molded product remains supported on one split mold. Therefore,
This eliminates the need for a retainer dedicated to the processing process, which was required in the past, and eliminates the need to replace the retainer.Furthermore, molding and appearance inspection can be performed at the same time, making it easier to detect defects. Furthermore, according to the device of the present invention, the finishing device (for edge processing) can be housed within the forming plate.
It requires less space for equipment installation,
Together, these can reduce product costs.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a forming apparatus according to an embodiment of the present invention, FIG. 2 is a half-cut sectional view showing the state of the same apparatus during edge processing, FIG. 3 is a half-cut sectional view of a U packing, and FIG. and FIG. 5 are half-cut sectional views of a conventional molding device. 1...Molding device, 2...Upper mold, 3...Lower mold, 4
...Inner core rod, 5...Outer core rod, 6...Cavity, 7...Cylindrical part, 8...Bearing, 9, 11
... Stoppa, 10, 12 ... Spring, 13
...Push-up rod, 14...Central protrusion, 15...Engagement notch, 16...Engagement protrusion, a...U packing,
a'...molded product, b...seal lip.

Claims (1)

[Claims] 1 A plurality of split molds 2, 3, 4, 5 are combined to form an annular cavity 6, and the cavity 6 is
In a molding device 1 for forming an annular packing a by filling a molding material into a molding material, the bottom wall of the cavity 6 is formed to form an annular packing after molding.
One split mold 5 supporting a′ is connected to other split molds 2, 3,
4. A molding device characterized in that it is movable up and down relative to 4 and rotatable about its center line.