JP2684263B2 - Manufacturing method of piston ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a piston ring, and more particularly to a method of manufacturing a piston ring suitable for manufacturing a piston ring of an internal combustion engine.

[0002]

2. Description of the Related Art Generally, a piston ring of an internal combustion engine is manufactured by casting a molten metal such as cast steel or cast iron into a single mold to form an elliptical ring-shaped material, and machining this material. ing. Further, a cylindrical material is formed, and this is sliced into rings to form a ring body, which is then heat treated to form an elliptical shape.

[0003]

However, in the conventional piston ring manufacturing method as described above, since a single mold for casting each piston ring is used,
Its use was limited, and there was a problem in the productivity of piston rings. Further, the method of manufacturing a piston ring from a cylindrical material is economically disadvantageous because it is formed into a predetermined shape by heat treatment, and it is structurally significantly changed, which is problematic for practical use.

[0004]

The present invention SUMMARY OF] is not limited for its production in order to solve the problems of the manufacturing method of the conventional piston ring, a cylinder which is more formed in the centrifugal casting axis thereof and sliced diagonally against to form a ring of oval, it is an-rings shaped by cutting the inner and outer sides of the ring body.

[0005] The present invention is particularly is effective in the case of producing a piston ring by using the material made of a multilayer material, is characterized especially in that casting material more piston rings to the centrifugal casting method. Specifically, the thus-formed cylindrical body to the centrifugal casting method, and sliced to form an oval ring obliquely with respect to its axis, for the manufacture of cutting the piston ring and out side of the oval ring It is a thing.

First, it is necessary to manufacture a cylindrical multi-layer material by a centrifugal casting method . For this, a continuous casting method is carried out by using a molten metal of cast steel or cast iron alone. A method of forming a more cylindrical material body, or a method of casting a molten cast steel by a centrifugal casting method on the inner surface of a preformed cast iron inner cylinder to form a multilayer cylinder, further,
There is a method of forming a multi-layered cylindrical body by casting molten metal of cast iron by the Elsla welding method on the outer surface of a preformed cast steel cylindrical body.

The cylindrical material thus formed is sliced into a slanting angle with respect to its axis.
As a result, an elliptical ring is formed, which forms the piston ring blank. Then, this ring-shaped material is machined to produce a piston ring having a predetermined shape and size.

[0008]

EXAMPLES Examples of the method for manufacturing a piston ring according to the present invention will be described below with reference to the drawings. 1 is a partially enlarged side sectional view of a cylindrical body 1 formed by a centrifugal casting method. (A shows a cross section of a single-layer cylindrical body 1 of steel or cast iron, and FIG. ) Shows the case where the inner layer cylinder 1a is steel and the outer layer cylinder 1b is cast iron, which is a so-called multilayer structure.

The thickness t of the cylindrical body 1 or the laminated cylindrical body 1'of 1a and 1b needs to be cast so as to be larger than the predetermined piston ring thickness t ₁ described later by a machining allowance Δt. There is. The cylindrical bodies 1 and 1'formed in this manner are cut in parallel with a width h so as to have an inclination angle α with respect to the axis c as shown in FIG. Is formed.

This inclination angle α is about 5 ° to 15 °, and as a result, as shown in FIG. 3, the major axis D (for example, 1.00).
The elliptical ring 2 having a smaller diameter d (inner diameter of the cylindrical body) of 4 × d to 1.035 × d) is formed. In the cross section of the elliptical ring 2, the inner and outer surfaces are formed as inclined surfaces having the inclination angle α. The notch 3 is machined in the elliptical ring 2, and the cutting portion 4 is removed by machining so that the inclined surface becomes an orthogonal surface as shown in the sectional view of FIG. In this way, when the inclined surface is cut by machining, the ring 2 having a rectangular cross section and an elliptical shape in plan view is used.
Is formed.

FIG. 5 shows a cross section of an elliptical ring 2'having a multi-layered structure.
Is machine cut. Then, a piston ring having a thickness t is formed. The notch 3 for making the elliptical ring 2 C-shaped is formed by previously machining the cylindrical body 1 as a slit in the longitudinal direction to form the linear grooved cylindrical body 1, and thereafter, the cylindrical body 1 is formed. Alternatively, the elliptical ring 2 may be formed by diagonally slicing.

The piston ring composed of the elliptical rings 2 and 2'formed in this way is fitted into the piston groove of the piston of the internal combustion engine (not shown) and inserted into the cylinder. In this fitted state, the piston rings 2 and 2'become in a state close to a circle, and a reaction force is generated, and this reaction force can perform gas sealing and form an oil film in the cylinder.

[0013]

As apparent from the above description, a manufacturing method of a piston ring according to the present invention forms the oval ring body is sliced obliquely with respect to its axis more forming a cylindrical body centrifugal casting and, they have a-ring-like by cutting in and out sides of the ring body.

Accordingly, the centrifugal casting method is effectively used to cast a cylindrical body, and the desired piston ring is manufactured by diagonally cutting the cylindrical body. It is possible to manufacture without damaging the structure of the layer material. As a result, durability can be improved. Further, the cutting by machining the thus obtained cylindrical bodies centrifugal casting, since it produced by a simple means of cutting, there is an effect that the production time can be greatly shortened.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention,
(A), (b) figure is a sectional side view of a cylindrical body.

FIG. 2 is a cutting explanatory diagram of a cylindrical body.

FIG. 3 is an explanatory diagram of an elliptical ring.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

5 is a diagram in which the elliptical ring of FIG. 3 has a multi-layer structure;
It is A sectional drawing.

[Explanation of symbols]

1 Cylindrical body 2 Elliptical ring 3 Notch 4
Cutting part.

Claims (1)

(57) [Claims] [Claim 1] and sliced more forming a cylindrical body centrifugal casting oblique to its axis to form a ring of oval,
Method of manufacturing a piston ring to-ring shape by cutting the inner and outer sides of the ring body.