PL76518B1 - Manufacture of wiping rings with internal grooves and expander springs[gb1351298a] - Google Patents

Abstract

1351298 Forging dies M P FABREGAT 19 April 1971 [4 April 1970] 26214/71 Heading B3H [Also in Division F2] A wiper ring assembly for a piston comprising a split metal wiper ring 7 urged outwardly by a split annular expander spring 9 housed in a groove 8 in its inner periphery is made by diepressing a split metal ring, one die section being arranged to restrain the external periphery of the ring and the other having a disc portion 5 provided with an annular outwardly extending projection 14 which, when the die assembly is closed as in Fig. 1, forms the groove 8, removing the split ring 7 from the die assembly and housing the spring 9 in the groove. The die assembly comprises an upper platen 1, to which the disc 5 is attached, a lower platen 3, a die ring 2 and a centring ring 4. The ring 7 is formed prior to die-pressing from copper or copper alloy bar which is rolled or drawn to size, cut into required lengths and curved to form a split ring. When the die sections are separated, the ring 7 remains attached to the projection 14 and is then removed manually. The groove 8 may be of semicircular, triangular or rectangular cross-section and the spring 9, which is of steel, may be of circular, triangular or rectangular cross-section. In a modification the platen 3 is provided with radial recesses 18, Fig. 12, to form radial oil passages in the ring. [GB1351298A]

Description

Piston ring and the method of its production The subject of the invention is a ring, especially for piston motors, and the method of its production. There are many types and types of piston rings made of hard materials on special devices that require expensive molds. The production costs are therefore high because the dies used are not suitable for the production of rings of a similar or different shape. Also, the replacement of their components presents many difficulties. The object of the invention is to develop a piston ring of such a design that would allow for its easier production by using easily replaceable and cheap tooling. The object of the invention is to produce a piston ring, which, when using copper and its alloys, will allow the use of conventional presses and will ensure easy interchangeability of dies and dies. According to the invention, the piston ring has a center-facing inclined face, which is provided with radially directed caves to drain excess oil and one The invention also encompasses a method of producing a ring according to the invention, in which the rods of copper or its alloys are turned into piston rings by means of dies and dies of appropriate shapes and dimensions, whereby during extrusion, an internal groove is made for the element on a resilient steel ring, and the inscription is embossed, and one or two faces of the piston ring are ground with a magnetic grinder. The invention uses an iron ring to hold the piston rings during grinding on a magnetic grinder. This pulley is slightly lower than the piston ring and has a downward shape so that the piston ring is held against the magnetic table by pressing against the groove or steel ring. According to the embodiment according to the invention, the groove or grooves are inserted into the groove or into the grooves. elastic steel rings of various thicknesses and shapes to fix the ring during grinding. In addition, according to the invention, the spring rings, located in the internal grooves, have different thicknesses and different profiles, adapted to the elasticity of the individual needs. Piston rings made according to the invention are used in various ways, for example with compressors, scrapers, fryers, etc. The production method allows to reduce the number of dies and tooling. The subject matter of the invention is illustrated in e.g. Fig. 1 shows a lubricating or scraper ring with an attached elastic ring in a vertical section, Fig. 2 - a piston ring with an elastic ring in its groove, in a horizontal section, Fig. 3 - an elastic ring in a view from above, Fig. 4 - elastic ring with a circular section, Fig. 5 - elastic ring with a triangular section, Fig. 6 - elastic ring with a square section, Fig. 7 - elastic ring with a rectangular section, Fig. 8 - ring prepared for grinding its planes, in vertical section, Fig. 9 - piston ring with a ferromagnetic material ring fitted, prepared for grinding, in vertical section. Embossed piston ring 7 (Fig. 1) is provided with internal grooves 8, which serve for the subsequent installation of suitable spring rings 9 made of steel, circular 10, triangular 11, square 12 or rectangular 13, Piston ring 7 (Fig. 8) has an iron disc 19 in the groove 8 which is attracted to the magnetic grinding table. The disc 19 (FIG. 16) rests on a ring 9. In both cases it is expedient for the disc 19 to have a bevelled edge and that its contact plane with the magnetic table is strictly at the height of one of the piston ring surfaces. PL

Claims (6)

Claims 1. Piston ring, characterized in that it has a center-inclined end face, which is provided with radially directed grooves to drain excess oil, and one or more internal grooves (8). 5 2. Ring according to claim A method as claimed in claim 1, characterized in that in the groove or in the grooves (8), open spring rings (9) made of materials of suitable thickness and shape are placed. 2. LO 3. Ring according to claim A method according to any of the preceding claims, characterized in that the ring (9) has a different thickness and shape, preferably round, triangular, square or rectangular adapted. elasticity 15 to suit each need. 4. A method for producing a piston ring according to claim A method according to any of the claims 1 to 3, characterized in that the piston rings are extruded from copper rods or its alloys by means of dies and dies of appropriate shapes and dimensions, and during the extrusion an internal groove is made for a ring-shaped elastic element steel, and the inscription is embossed and one or both surfaces of the piston ring are ground with a magnetic grinder. 5. The method according to p. The method of claim 4, wherein the downward tapering ferromagnetic disc is used to hold the piston ring during grinding on the magnetic grinder, with a height slightly lower than that of the piston ring. 35 6. The method according to p. 4-5, characterized in that the piston ring is held on the table of the magnetic grinding machine by means of an elastic ring. 46i, 5/00 76 518 MKP F02f 5/00 \ Fiq.1 Fig. 2 10 11 Fiq.3 12 13 Fiq.4 Fig. 5 Fig. 6 Fig. 7 8 7 19 Fig. 8 EN