JPS6184480A - Method for manufacturing seal ring in mechanical seal - Google Patents

Abstract

PURPOSE:To improve working efficiency and exclude effect of elastic deformation due to strain and swell by providing plural projections on an end face of the opposite side on a sliding face of a seal ring and finishing the sliding face with these projections as a processing datum level. CONSTITUTION:Plural semi-global projections 4 are formed on an end face 3 of the opposite side of a sliding face which becomes a processing datum level of the sliding face 2 in a floating sheet 1. And the tips of the projections 4 are ground slightly to become plane to obtain a precise processing datum level without strain and swell easily. And when the processing datum level is retained so as to be covered by a common processing jig with the projections as a datum level, the jig face and the projections 4 of the datum level are contacted closely and elastic deformation of raw material due to clamping force of the jig and load of turning does not occur, then plane face without strain and swell can be obtained by one turning. Therefore working efficiency can be improved by shortening processing time and sealing ability can be improved by removing strain and swell.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing the active surface of a seal ring in a mechanical seal.

Conventional technology As shown in Figure 7.2, a floating seat (10 is fixed floating on the shaft through an O-ring (7a) to a collar (A) fixed to a non-rotating shaft (A); 0 ring (7) on the bush G force that rotates symmetrically with this
) is fixed in a floating state on the h-axis of the floating sheet (/b), and the surface (2&) and surface Qb) contact with surface pressure and form a sliding surface, which rotates relative to each other and works to create a sealing effect. Or, as shown in Fig. 73, the rotating shaft (2
The rotating side ring (driven link) (10) attached to the casing (/7) and the stationary side ring (seat ring) (/3) attached to the casing (/7) face each other in a plane perpendicular to the axis.
A mechanical device that creates a seal by pressing the rotating surface (//) against the fixed surface (/→) with a spring (/B) and rotating and sliding them relative to each other to prevent fluid from leaking from the outside or inside. In seals, fluid leakage occurs on sliding surfaces.
In order to make it zero or minute, it is required to improve the surface precision of the sliding surface, and super finishing such as rubbing is required to flatten the sliding surface and give it a mirror-like finish. Furthermore, the sliding surface is required to have wear resistance, and it is difficult to process the sliding surface because it is made of a special alloy cast iron containing 2 cm of W, Or, etc., and is a hard and brittle material with high hardness.

The material for seal rings is manufactured by casting, etc., and then the sliding surfaces are turned, ground, polished, etc. However, since seal rings are generally thin-walled, deformations such as distortion and waviness cannot be observed in the material. .

Therefore, when turning the end face on the opposite side of the sliding surface, which is the processing reference for the sliding surface, when gripping the seal ring with a conventional processing jig, there may be distortion or waviness between the jig surface and the material sliding surface. This creates a gap in the material due to the tightening force of the jig and the load during turning, so even if the machining reference surface is turned flat, the elastic deformation will occur when the material is removed from the jig after turning. When the reference surface returns to its original state, distortions and undulations appear on the reference surface, making it no longer flat.

Next is the sliding surface? Using this reference plane as a reference, the material is held in a conventional machining jig and turned, but the same result as described above occurs, and after 7 turnings, the distortion and waviness of the material cannot be removed and a flat surface cannot be obtained. In order to increase the machining fee for the sliding surface and to minimize residual distortion and waviness, the entire turning process was performed seven more times. After one turning of the sliding surface is completed, the sliding surface is ground, but in order to reduce the effects of distortion and waviness, the processing reference face end face is first ground, and the sliding face is ground using this surface as a reference. However, in many cases, the distortion and waviness cannot be removed with the prescribed grinding amount of 7 times, resulting in so-called "face loss", where the turning marks are lost and the remaining marks are removed by grinding 7 times or once more. Then, the final sliding surface is wrapped and finished to a mirror finish, resulting in a sliding surface with excellent sealing properties.

Problems to be Solved by the Invention Due to the unavoidable distortion and waviness of the material of the seal ring, it is difficult to obtain a flat surface unless the machining allowance is increased and the number of turning and grinding operations is increased. There is the problem that the sliding surface cannot be obtained and the work efficiency is degraded, and furthermore, if the degree of distortion or waviness is excessive, it may not be completely removed and will appear on the finished sliding surface, causing it to become flat. There were also many problems in terms of quality, such as the risk of loss of strength and poor sealing performance.

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and a plurality of protrusions form continuous wave-shaped protrusions on the opposite end surface of the sliding surface. The present invention relates to a manufacturing method that improves work efficiency by finishing the sliding surface as a processing reference surface, eliminates the effects of elastic deformation due to distortion and waviness, and provides a seal ring with an excellent sliding surface.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

As shown in Figures 1 and 2, 70-Ting Sea M/)
A plurality of hemispherical protrusions (44) are formed on the opposite end surface (2) of the sliding surface Q, which serves as a processing reference surface.

The tip of the protrusion (4'L) is lightly ground with a belt grinder or the like without applying too much load, and the tip of the protrusion is completely flat and black, making it easy to create a highly accurate machining reference surface with almost no distortion or waviness. Note: If the protrusion is then held in a conventional machining jig with the protrusion as a reference surface, the jig surface and the protrusion on the reference surface will come into close contact, and the elastic deformation of the material due to the clamping force of the jig or the load of turning will be reduced. Therefore, a flat surface without distortion or waviness can be obtained by turning seven times.Therefore, in the next grinding, the machining reference plane (
Since the grinding in 3) becomes unnecessary and the turned surface is finished flat, a good ground surface without any residual marks can be obtained after 7 grindings, and then a mirror finish is done by lapping etc. 7 times or 2 times. Grinding is no longer necessary. As for the shape of the protrusion (→), as shown in FIG. 7, in addition to hemispherical shape (al), cylindrical shape (b), cylindrical shape (C), angular vertebrae shape, prismatic shape, etc. are used.

In addition to the plurality of protrusions mentioned above, continuous wave-shaped protrusions (44) shown in FIGS. The cross-sectional shape of the bar-like protrusion is triangular, circular, quadrangular, etc.

Number of protrusions to be formed (1) The protrusions are arranged so that there is sufficient spacing to prevent elastic deformation on the end surface of the part.The shape and size of the protrusions will depend on the shape and size of the seal ring and the degree of distortion and waviness that will occur. The process is selected and implemented as appropriate.

A plurality of hemispherical protrusions are shown in Figures 1 and 2 and 1 of the examples of the driven ring. The same applies to cases of other protrusion shapes and seat rings as in the case of the above-mentioned floating seat.

Effects The manufacturing method of the present invention, in which the sliding surface is finished by forming all the protrusions as a processing standard, allows a flat processing reference surface that is not affected by distortion or waviness to be easily and accurately formed, which enables (1) Turning and grinding. The number of operations was reduced, machining time was shortened, and work efficiency was greatly improved.

(2) The effects of distortion and waviness were eliminated, and a sliding surface with excellent sealing performance was obtained, resulting in improved quality.

In addition to seal rings made of special alloy cast iron, the present invention can be easily applied to ring-shaped end faces made of other materials, and is useful in a very wide range of applications.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along line A-A in FIG. FIG. 2 is a plan view of a floating sheet forming a plurality of protrusions according to an embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line A-A in FIG. Figure ≠ is a plan view of a floating sheet forming continuous chevron-shaped protrusions according to an embodiment of the present invention. FIG. 5 is a sectional view taken along the line AA in FIG. 2. FIGS. 4 and 4 are plan views of a floating sheet in which a plurality of bar-shaped protrusions are all formed according to an embodiment of the present invention. 7th
The figure is a sectional view taken along line AA in Figure ♂. FIG. 9 is an enlarged cross-sectional view of section t in FIG. 1 and section B1 in FIG. 70. FIG. 1 is a plan view of a driven ring forming a plurality of protrusions according to an embodiment of the present invention. FIG. 72 is a sectional view of a main part showing how the floating seat is installed. Figure 13 (d Cross-section of essential parts showing the installation status of the driven ring and seat ring 11°/: Floating seat, 2: Sliding surface 3; Machining reference surface ≠: Protrusion; Applicant Riken Co., Ltd. Figure 1 Fig. 2 A L->A Fang 5 Fig. f6 Off Fig. 8 Fig. A 89 Fig. Fang 1? Fig. 13

Claims (1)

[Claims] A mechanical seal that prevents fluid leakage by sliding of each sliding surface of a floating seat that is symmetrically combined, or by sliding of each sliding surface of a driven ring and a seat ring that face each other. In processing the sliding surface of the ring, a plurality of protrusions or continuous wave-shaped protrusions are formed on the end face on the opposite side of the sliding surface, and the sliding surface is processed and finished using the protrusions as a processing reference. How to make a seal ring.