JPH05309557A - Lapping device of piston ring - Google Patents

Abstract

PURPOSE:To make it possible to lapping-process the barrel face of a non-circular piston ring with a cross section of an oval form, an ellipse form, or the like, and to suppress the abrasion of the inner peripheral surface of a lapping sleeve. CONSTITUTION:In this lapping device, collars 6 and 8 to carry a non-circular piston ring 7 are fixed to an upper holder 11 through a swash plate 10 by using a holder rod 4. The upper holder 11 is fixed to a rotary shaft 13, the rotary shaft 13 is moved up and down and rotated, and the piston ring 7 is made possible to fluctuate and move up and down. On the inner peripheral surface of the main body 2 of a lapping sleeve 1, an electrocoating painting layer 3 in which superhard abrasive grains are dispersed is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring lapping device having a cross section of an ellipse or an ellipse.

[0002]

2. Description of the Related Art An internal combustion engine has a basic structure in which the movement of a piston that reciprocates in a cylinder is taken out as a rotational movement to the outside through a crank mechanism. A piston ring is mounted in the ring groove on the outer peripheral surface of the piston for a seal between the piston and the cylinder. Since the cross-sectional shapes of the outer peripheral surface of the piston and the inner peripheral surface of the cylinder are generally substantially circular, the nominal diameter of the piston ring mounted on the piston is also substantially circular.

Since the sealing performance of the piston ring greatly affects the finishing accuracy of the outer peripheral surface of the piston ring, finishing the outer peripheral surface of the piston ring is an important step.
Lapping is used as this process. The outer peripheral surface of the piston ring is lapped by inserting the piston ring into a cast iron lapping sleeve that has an inner peripheral surface equal to the nominal diameter of the piston ring, with its mating end closed, and Utilizing this, the outer peripheral surface of the piston ring is brought into pressure contact with the inner peripheral surface of the wrapping sleeve.

A plurality of stacked piston rings are moved up and down while supplying a grinding fluid containing abrasive grains such as diamond powder, aluminum oxide, silicon carbide, chromium oxide, zirconia oxide, and silicon dioxide, and the piston ring outer peripheral surface is moved. To finish. When finishing the outer peripheral surface of the piston ring into a barrel face, hold the piston ring between the upper and lower collars that are angled with respect to the shaft, move the piston ring up and down in the presence of grinding fluid, and rotate the wrapping sleeve or piston ring itself. Let In this case, since the abutment of the piston ring is in a closed state, a force acts on the piston ring itself in the expanding direction, and the force is concentrated near the abutment. However, since the wrapping sleeve and the piston ring are rotating relative to each other, the inner peripheral surface of the wrapping sleeve is evenly worn, resulting in a slightly larger true circular inner diameter than initially, and as a wrapping sleeve for a larger diameter piston ring. It can be reused.

Apart from the above-mentioned internal combustion engine, in order to improve the performance of the engine by improving the volumetric efficiency, it is proposed that the outer peripheral surface of the piston and the inner peripheral surface of the cylinder have an oval or elliptical cross section. ing. In this case, the piston ring also has a shape similar to the inner peripheral surface of the cylinder, that is, its cross-sectional shape is oval or elliptical.

[0006]

In order to lap an oval or elliptical non-circular piston ring, the piston ring is inserted into the lapping sleeve, but the cross section of the laminated piston ring and the lapping sleeve is The piston rings cannot be rotated relative to the wrapping sleeve because they are both non-circular. Therefore,
Processing the outer peripheral barrel face was extremely difficult and time-consuming. In addition, when a large amount of piston rings are continuously machined in the conventional cast iron sleeve, local excessive friction is likely to occur locally near the piston ring mating surface on the sleeve inner surface, and the outer peripheral surface of the piston ring has a uniform diameter and a uniform diameter. Therefore, it was necessary to replace the wrapping sleeve in an extremely short cycle, and it was difficult to reuse itself.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

[0008]

SUMMARY OF THE INVENTION The present invention uses a swinging work member of a piston ring lapping device in which a swash plate is interposed between a rotary shaft and a collar holding a piston ring, and a barrel is provided on the outer peripheral surface of the piston ring. Enables face processing.

Further, in order to solve the above-mentioned problems, the present invention basically uses a sleeve in which a lapping sleeve is made of hardened alloy steel, and an inner peripheral surface of the lapping sleeve is further subjected to polishing and super-hard abrasive grains are electrodeposited. Adopt means.

Specifically, the present invention comprises a rotating shaft, an upper holder supported at the end of the rotating shaft, a support rod penetrating the center of the upper holder, and a bearing fixed to the lower part of the rod. A split mold collar supported by a rod through a lower holder and a lower holder that is held by the collar and faces the upper collar through a swash plate, and the rotary shaft performs vertical movement and rotary movement,
An oscillating workpiece member in a piston ring wrapping device wherein the collar has a non-circular cross section and the collar holds the piston ring.

Further, according to the present invention, a sleeve body made of alloy steel having an inner peripheral surface having a non-circular cross-sectional shape, and an electrodeposition layer or an adhesive layer of ultra-hard abrasive grains provided on the inner peripheral surface of the sleeve body. And a wrapping sleeve in a piston ring wrapping device having:

Further, according to the present invention, the rotating shaft, the upper holder supported at the end of the rotating shaft, the supporting rod penetrating the center of the upper holder, and the bearing fixed to the lower portion of the rod are used. And a lower holder that is held by the collar and faces the upper collar via a swash plate, the rotary shaft performs vertical movement and rotary movement, and the cross-section of the collar is non-moving. A swinging work member in a piston ring lapping device having a circular shape and a collar holding a piston ring; a sleeve body made of hardened alloy steel with an inner peripheral surface having a non-circular cross-sectional shape; Provided is a piston ring lapping device including a lapping sleeve in a piston ring lapping device having an electrodeposition layer or an adhesive layer of ultra-hard abrasive grains provided on a peripheral surface.

[0013]

[Operation] The lapping device moves the rotary shaft up and down,
When rotated, the swash plate swings the collar that holds the piston ring. Since this collar oscillates, the contact angle of the piston ring outer peripheral surface with respect to the sleeve inner peripheral surface is changed,
You can make a barrel face piston ring.
When the outer peripheral surface of the piston ring is straight, the tilt angle of the swash plate is set to zero and the rotary shaft is only moved vertically. further,
By using the electrodeposition layer or the adhesive layer of the ultra-hard abrasive grains on the inner peripheral surface of the sleeve body, the outer peripheral surface of the piston ring can be lapped without using an abrasive. To remove the ultra-hard abrasive grains, electrodeposition or an adhesive layer may be provided again. There is little wear of the sleeve body, and dimensional control of the inner peripheral surface is easy.

An example of the lapping device will be described with reference to FIG. The sleeve 1 used is the one shown in FIG. 1, and has an inner peripheral surface having an electrodeposition layer or an adhesive layer 3 in which the cross section is non-circular and in which ultra-hard abrasive grains are dispersed. The details will be described later. Spherical bearing 5 fixed to the lower part of support rod 4
The upper collar 6 having an elliptical plate shape is supported via. By stacking a plurality of piston rings 7 on the outer peripheral step of the upper collar 6 and fixing the lower collar 8 to the upper collar 6, the piston ring 7 is prevented from falling from the upper collar 6.

A swash plate 10 is attached to the top surface of a cylindrical lower holder 9 which is seated on the upper edge of the central hole of the upper collar 6 via a bearing. The upper holder 11 is rotatably opposed to the rod 4 on the flat surface of the swash plate 10. A nut 12 is fastened to the upper end of the rod 4, and the upper and lower holders 9,
11, the swash plate 10, and the upper and lower collars 6 and 8 are attached.
The upper holder 11 is fixed to the rotating shaft 13 such that the shaft center of the rotating shaft 13 and the shaft center of the rod 4 coincide with each other.

When the rotary shaft 13 is moved up and down, the collar 6,
The outer peripheral surface of the piston ring 7 supported by 8 is straight processed. When a rotary motion is applied to the rotary shaft 13 in addition to vertical movement, the rotation of the swash plate 10 causes the lower holder 9 and the collars 6, 8 to rotate.
And are integrated and are swung up and down around the swing center 14. This swinging causes the outer peripheral surface of the piston ring 7 and the sleeve 1 to move.
The adhesion angle with the inner peripheral surface of is changed to give the barrel face to the outer peripheral surface. That is, the swash plate 10 converts the rotary motion of the rotary shaft 13 into the vertical swing motion of the collars 6 and 8 to enable barrel face machining. The barrel face shape can be changed by changing the tilt angle of the swash plate 10.

When the lapping process of the outer peripheral surface of the piston ring 7 is completed (the supply of the lapping agent is unnecessary), the lower collar 8 is separated from the upper collar 6 and a new piston ring is replaced with the upper collar 6 instead of the lapping-processed piston ring. The lower collar 8 is fixed to the upper collar 6. The piston ring 7 is inserted into the wrapping sleeve 1 and the rotary shaft 13 is given the required movement.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lapping sleeve 1 comprises a non-circular sleeve main body 2 whose inner peripheral surface has an oval or elliptical cross section.
KD11 alloy steel is manufactured by NC machining. Carburize the inner peripheral surface that has been NC processed to a predetermined size. In the carburizing process, for example, the solid carburizing agent and the sleeve main body 2 are put in a carburizing box and heated at a high temperature of 850 to 950 ° C. for 1 hour, whereby carbon is diffused on the inner peripheral surface of the sleeve main body to form a carburized layer. .. The inner peripheral surface of the carburized sleeve body is polished to improve the finishing surface accuracy.

Next, the inner peripheral surface of the sleeve body is further electrocoated with ultra-hard abrasive grains (diamond grains, CBN, etc.) 3.
This electrodeposition coating is, for example, by direct current electricity in an emulsion resin paint tank in which fine diamond particles are dispersed,
The paint is electrodeposited on the inner peripheral surface of the sleeve body. Wash the sleeve body with the electrodeposition coating layer 3 on the inner peripheral surface with water, 2
It is baked and dried at 00 ° C. to form a layer having a constant thickness in which fine diamond particles are dispersed. By the way, in the embodiment, 5
Diamond particles of ~ 25μ are selected and used in a timely manner.

Instead of the electrodeposition layer, paper, resin sheet or metal sheet carrying ultra-hard abrasive grains (diamond grains, CBN, etc.) may be adhered to the inner peripheral surface of the sleeve body. In any case, the wrapping sleeve 1 according to the present invention enables the wrapping process without supplying the wrapping agent, and the electrodeposition or the abrasion of the adhesive layer need only be replaced by this layer.

[0021]

[Effect] By adopting the above-mentioned structure, the outer peripheral barrel face can be easily machined even in the case of a piston ring having a non-circular shape in which the piston ring and the wrapping sleeve cannot rotate relative to each other as in the present case. In addition, by adopting the wrapping sleeve as described above, wear of the inner peripheral surface is reduced and the life is extended, and even if the super-hard abrasive grains fall off or peel off, re-electrodeposition etc. is easy,
The sleeve body can be reused.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a wrapping sleeve according to an example of the present invention.

FIG. 2 is a cross-sectional view of a lapping device as an example of the present invention.

[Explanation of symbols]

 1 Lapping Sleeve 2 Sleeve Main Body 3 Electrodeposition Layer 4 Support Rod 6, 8 Color 7 Piston Ring 9, 11 Holder 10 Swash Plate 13 Rotating Shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Fukamachi 1904-1 Sasai, Sayama City, Saitama Prefecture (72) Inventor Ken Kanazawa 5-22-24 Higashifujisawa, Iruma City, Saitama Prefecture

Claims (3)

[Claims] 1. A rotating shaft, an upper holder supported on an end of the rotating shaft, a support rod penetrating the center of the upper holder, and a bearing fixed to the lower part of the rod, and supported by the rod. It has a split collar and a lower holder that is held by the collar and faces the upper collar via a swash plate, the rotary shaft performs vertical movement and rotary movement, and the cross section of the collar is non-circular and A swinging work member in a piston ring lapping device in which a collar holds a piston ring. 2. A sleeve body made of a hardened alloy steel whose inner peripheral surface has a non-circular cross-sectional shape, and an electrodeposition layer or an adhesive layer of ultra-hard abrasive grains provided on the inner peripheral surface of the sleeve body. A wrapping sleeve in a piston ring wrapping device having. 3. A rotary shaft, an upper holder supported on the end of the rotary shaft, a support rod penetrating the center of the upper holder, and a bearing fixed to the lower part of the rod, and supported by the rod. It has a split collar and a lower holder that is held by the collar and faces the upper collar via a swash plate, the rotary shaft performs vertical movement and rotary movement, and the cross section of the collar is non-circular and An oscillating work member in a piston ring wrapping device, the collar holding the piston ring;
Lapping of a piston ring having a sleeve body made of hardened alloy steel whose inner peripheral surface has a non-circular cross-sectional shape and an electrodeposition layer or an adhesive layer of ultra-hard abrasive grains provided on the inner peripheral surface of the sleeve body. Piping ring lapping device consisting of lapping sleeve in device.