JPS62251110A - Forming method for wax prototype of sliding ring of floating seal - Google Patents

Abstract

PURPOSE:To enhance mold accuracy and life by forming two wax rings by means of two couples of wax molds and bonding said two rings after molding. CONSTITUTION:A first wax molding tool is constituted with two divided molds 2 and 3, moving relatively up and down and combined with freely bonding and separating, and a cavity 14 for molding a wax ring 12, counterpart of wax prototype 11 constituted between opposite faces of said divided molds 2 and 3 is formed. A second wax molding tool 6 is constituted with two divided molds 7 and 8, and a cavity 9 for molding a wax ring 13, counterpart of the wax prototype 11 is formed between the opposite faces of said divided molds 7 and 8. The wax prototype 11 is manufactured by bonding concentrically the two wax rings 12 and 13 molded separately by a couple of wax molding tools 1 and 6 above-referred.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to the production of a sliding ring of a blotting seal used as an external seal for the undercarriage of construction machinery by the lost wax method. The aim is to improve the method.

[Conventional technology]

For example, as shown in Fig. 4, the floating seal is loosely fitted onto the shaft (b), and a pair of sliding rings (a) made of cast iron or the like are attached to the non-rotating fuselage side housing (a). C) Inner periphery and rotating roller side housing (d)
They are airtightly supported on the inner periphery via gaskets (e) (e), and are configured to perform a sealing function by sliding closely against each other. Both sliding rings Ca) (a) are
Since precision is required in terms of functionality, precision casting methods such as the lost wax method are employed in their manufacture.

Conventionally, when casting the sliding ring (a) by the above-mentioned lost wax method, first, as shown in FIG.
Using a wax mold (51) in which split molds (54) and (55) that are relatively movable in the direction are combined, an annular cavity (58) is formed between these split molds (52)...(55). By injecting and filling a molding material such as wax into the inside and hardening it, a wax model (57) as shown in FIG. 6 is formed. Next, this wax model (57) is embedded in a mold material (intestation material) (not shown), and the wax is eluted by heating to cast the final product, the sliding ring (a). Make a mold. The molten metal material is poured into the cavity formed in the mold by the elution of the wax, and after hardening and cooling, the mold is broken and the product (sliding ring (a
)).

[Problem that the invention seeks to solve]

The sliding ring (a) of the floating seal is
) has protrusions (al) (a2) forming the fitting part, that is, the wax model (57) having the same shape also has protrusions (57a) (5?b). Because of the need to be able to open the mold during molding, a wax mold (51) divided into four parts as described above is conventionally used. However, in this mold (51), each of the divided molds (52)...(55) constituting the mold (51) has a mating surface (58) (59) (58') (5) when the mold is clamped and opened.
8 degrees), so the chain parts (58) (5
11) (58°) (513') is easy to wear, and
The split type (52) (53) is vertically divided, and the split type (54)
(55) is relatively movable in the left-right (horizontal) direction, so there is a problem that the mechanism for the movement is complicated.

[Means for solving problems]

The method for molding a wax model of a sliding ring of a floating seal according to the present invention enables molding with a two-piece mold by making the wax model a joined body of two wax rings with a simple cross-sectional shape. This was made in order to solve the above problems, and it was made to create two wax molds in which an annular molding cavity is formed between two split molds that can be joined and separated from each other. The sliding ring of the floating seal is divided into two in the axial direction to form two wax rings, and after the molding, both wax rings are joined to each other to obtain a wax prototype of the sliding ring. It is a feature.

[For production]

According to the above-mentioned method of the present invention, the wax model is a joined body of two wax rings, and both wax rings are molded using two split wax molds. The split molds do not rub against each other on their mating surfaces when the molds are clamped or opened, and the moving mechanism of the split molds can also be simplified.

〔Example〕

Next, an embodiment of the method of the present invention will be described based on the drawings.

Reference numeral (1) in Fig. 1 is composed of two split molds (2) and (3) that move relative to each other in the vertical direction and are combined so that they can be joined and separated. (
A first wax mold formed with a cavity (4) for molding one of the wax rings (12) constituting 11), denoted by reference numeral (6) in FIG. 2, was assembled in the same manner as above. A cavity (8) composed of two split molds (7) and (8) for molding the other wax ring (13) constituting the wax master mold (11) between their opposing surfaces.
This is the second wax mold formed by the following. The wax pattern (11) used to manufacture the mold (not shown) for casting the sliding ring (a) of the floating seal (Fig. 4), which is the final product, is made of these two sets of wax. It is made by concentrically joining two wax rings (12) and (13) that have been separately molded using molds (1) and (8).

That is, the molding method of the above embodiment is based on a wax master mold (1
1) is a joined body of two wax rings (12) and (13), and the protrusion (lla) of the wax model (11) corresponding to the protrusion (al) and (a2) on the outer peripheral surface of the sliding ring (a) (llb
) are separated into the wax ring (12) side and the wax ring (13) side, respectively, so both the wax rings (12) and (13)
can be molded using two split wax molds (1) and (6).
) and (3) and (7) and (8) do not rub against each other on the mold matching surfaces (5) and (lO) during mold clamping or mold opening, and these split molds (2 ) and (3), (7) and (8) are moved toward and away from each other (
(not shown) can also be significantly simplified compared to the conventional four-split type.

〔Effect of the invention〕

As is clear from the above explanation, the method for molding a wax model of a sliding ring of a floating seal according to the present invention involves molding two wax rings using two sets of wax molds, and joining the two rings after molding. Since both wax molds are split into two molds, the split molds do not rub against each other, which significantly improves mold accuracy and mold life. This has the effect of simplifying the mechanism that operates it.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of a wax mold used in a method according to an embodiment of the present invention, Figure 3 is a cross-sectional view of a wax mold manufactured by the same method, and Figure 4 is a state in which a floating seal is installed. 5 and 6 are explanatory diagrams showing the conventional method.

Claims (1)

[Claims] In manufacturing the sliding ring of a floating seal by the lost wax method, two sets of wax molding molds each having an annular molding cavity formed between two split molds that can be freely joined and separated from each other are used to manufacture the sliding ring of the floating seal. Sliding of a floating seal characterized in that a wax prototype of the sliding ring is obtained by molding two wax rings in the shape of a moving ring divided into two in the axial direction and joining both wax rings to each other after molding. How to mold a ring wax model.