JPS6156801A - Method for manufacturing seal ring - Google Patents

Abstract

PURPOSE:To enable mass production and manufacture inexpensively by a method for removing finish processing and core material by holding the core material and cutting to a desired shape with a cutter by applying rotation or compression to the material. CONSTITUTION:In manufacturing a seal ring A made of an elastic material or reinforcing material to be mounted between two members rotating mutually (for example bearings) and sealing the outer and inner portions of these two members, when forming the ring A with a forming die, a portion of a core material 2 having sufficient rigidity is put in the central portion of the forming die C and integrated with the elastic body, and the core material 2 to be exposed on the outer portion of the forming is held to apply rotating motion or compression with a press to the formed matter B. And the formed matter B is cut to a desired shape by a cutter 3 or so and finish processing and core material 2 can be removed. Thus, mass production can be made and inexpensive manufacturing can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a small diameter seal ring which allows a sealing material for a bearing, most preferably a sealing material for a miniature bearing, to be easily obtained.

(Prior Art) Conventionally, a method for producing a sealant is to provide an upper mold and a lower mold with the desired shape of the sealant, and to fill the upper and lower molds with synthetic rubber,
A synthetic resin was supplied and removed from the mold to obtain the desired sealant.

(Problems that the invention sought to solve) For this reason, multiple molds had to be prepared (many molds were needed at once to mold a large number of molds), mold costs were high, and large quantities of There was also a limit to production.In particular, miniature bearings have rapidly become popular in recent years due to the miniaturization and higher performance of machines, and there has been a widespread demand for sealing materials for these. This manufacturing method is laborious, expensive, and cannot be mass-produced.Also, this manufacturing method requires material injection, or
A burr is formed due to the protrusion of the material, and in extremely small sizes, if this burr forms on the seal lip side, it becomes a serious hindrance and also has the disadvantage of reducing the sealing effect. Therefore, the removal of this paris was a tedious task.

[Means for solving problems]

The present invention eliminates these drawbacks and provides a method for manufacturing seal rings that is mass-producible and inexpensive.

When the present invention is explained based on the drawings, as shown in Fig. 4,
A method for manufacturing a seal ring A made of an elastic body, a reinforcing body, etc., which is inserted between two mutually rotating members (for example, a bearing 1, etc.) and seals the outside and the inside of the two members, the seal ring as described above. When forming A with a mold, as shown in Figure 1, a part of the third groove 2 having sufficient rigidity is inserted into the center of the mold 0 and integrated onto the elastic body, and then As shown in Figure 2, the core material 2 exposed to the outside of the molded product B is grasped, and the molded product B is compressed by rotation or press, and then cut into a desired shape with a knife or the like 6 for finishing treatment. It is characterized in that the core material 2 is removed.

At this time, the removal of the core material 2 involves cutting off a part of the molded product B holding the core material 2, and removing the part of the molded product B together with the finished product after cutting. Although this is preferable because a good sealing property can be obtained on the surface, it is also possible to use a core material 2 having desired dimensions and use the molded surface obtained by the core material 2 as it is.

[Effect]

In the present invention having such a configuration, as shown in FIG. The main feature is that the core material 2 is exposed, and the exposed core material 2 is
This makes it possible to hold the device with a holder 4 shown in the figure. This graspable structure has greatly improved the processability of small-diameter seal rings.For example, as shown in Figure 2, it can be processed by applying rotation, or it can be transferred to and attached to other processing machines. Using the gripped core material 2 as a fulcrum, quick and reliable operation can be achieved, completely eliminating the lack of physical accuracy due to the small diameter.

Of course, the core material 2 is removed when all finishing treatments are completed, but since the removed core material 2 has sufficient rigidity, a portion of the molded product B is removed as shown in FIG. If the molded parts are similar in size, the remaining molded parts can be discarded and used repeatedly, and if they are similar in size, they can be used as common parts.

Note that this core material 2 is explained as a rod-shaped material that is easy to handle in the axial direction in FIGS. 1, 2, and 3, but
It may be an annular core member 2' that can be held from the inner circumferential side as shown in the figure, and the shape is not particularly critical as long as the core member 2 can be gripped and held securely by other members.

In addition, the shape of the seal ring A was previously limited to a simple shape that did not have strong sealing properties due to problems such as moldability, mold releasability, or processability, but now it is fixed by the core material 2. Therefore, all of the above-mentioned problems have been solved, and it has become possible to manufacture a seal ring A having a complex shape with high sealing performance.

Another feature is that in the case of sealing material A having the same outer diameter but different inner diameters, conventionally it was necessary to make mold 0 for all of them, but with the present invention, the cutting width can be changed. It is an economical manufacturing method especially for extremely small hermetic intrusion.

〔Effect of the invention〕

As explained above, the present invention aims to manufacture an ideal seal ring that has high precision and good workability even if it is a small diameter seal ring, can be mass-produced, is inexpensive, and has excellent effects. It's a method.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a mold for implementing the present invention. 2 and 6 are cross-sectional views showing the state in which the present invention is implemented. FIG. 4 is a sectional view showing a state in which the seal ring is attached. FIG. 5 is a sectional view showing another embodiment of the present invention. A...Seal ring B...Molded product 0...
Molding mold 1... Bearing 2... Core material 6... Cutler 4... Holder; (Patent applicant Uchiyama Kogyo Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] 1. In a method for manufacturing a seal ring made of an elastic body, a reinforcing body, etc. that is interposed between two mutually rotating members and seals the outside and inside of the two members, when molding the seal ring, A part of the rigid core material is buried in the center and hardened, and then the core material exposed to the outside of the molded product is held and rotated or compressed and cut into a desired shape with a knife or the like. A method for manufacturing a seal ring, characterized by performing finishing treatment and removing a core material. 2. The method of manufacturing a seal ring according to claim 1, wherein the core material is removed from the elastic body and used repeatedly.