JPS608906Y2 - Centering device for piston machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centering device for piston machining that enables accurate piston centering work during piston machining.

Conventionally, when cutting the outer circumference of a piston after casting using a lathe, a piston mounting jig is attached to the spindle, and the piston is held from the inside by the piston holding part of the mounting jig to perform centering. Generally, a method is adopted in which the top of the piston is pressed at the center, the piston is rotated while being supported between two axes, and the piston is cut from the side with a cutting tool.

However, when centering the piston in machining the outer periphery of the piston as described above, conventionally, the piston is centered by holding the piston in the piston holding part in one movement with respect to the jig. There are many cases where the piston is supported out of alignment with the predetermined centering position, and if the outer circumference of the piston is cut in this state, the correct outer circumferential surface of the piston cannot be obtained, resulting in many defective products. there were.

The present invention was devised in view of this point, and by mounting the piston by swinging it several times in the spindle axial direction with respect to the mounting jig, the piston can always be corrected to an accurate centered position. It is an object of the present invention to provide a centering device for machining a piston, which can be supported by the piston, thereby enabling accurate machining of the outer periphery of the piston.

That is, the present invention provides a piston mounting jig that is elastically installed to be movable in the axial direction of a spindle installed on a fixed base and has a piston holding portion that holds the piston from the inside, and the piston mounting jig. is installed opposite the
A center is attached to the tip of a piston rod that has a
It has a center actuating cylinder that repeatedly abuts the center against the top of the piston, and a hole or notch through which the center can pass, and the actuating cylinder attached to a fixed base allows the center to be brought into contact with the top of the piston. The piston is characterized by comprising a contact plate that is provided so as to come into contact with or come close to the top of the piston attached to the piston mounting jig when the piston is repeatedly abutted against the piston.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed base of the lathe. A rotatable spindle 2 is provided on the fixed base 1, and a piston mounting jig 3 is installed at the tip of the spindle 2. , the piston mounting jig 3 has a piston holding portion 4 that holds the piston A from the inside.

As shown in detail in FIG. 3, the piston holding portion 4 includes a skirt holding member 4a that contacts the piston A at its skirt portion, and a corner holding member 4b that contacts the piston A at an inner corner position. Center holding member 4 that abuts at the head center position
The piston A is held in a centered position by bringing each of the members 4a to 4c into contact with a predetermined position inside the piston A, and each of the members 4a to c 4c are biased in the forward direction by springs 5, 6, and 7, respectively, and the spindle 2
It is elastically installed so that it can move forward and backward in the axial direction.

Reference numeral 8 denotes a center actuation cylinder installed on the fixed base 1 facing the piston mounting jig 3, and a center 9 is attached to the tip of the piston rod 8a of the center actuation cylinder 8. By operating the center actuating cylinder 8, the center 9 is actuated so as to abut against the top A□ of the piston A held by the piston holding portion 4 of the piston mounting jig 1, thereby moving the piston A in the longitudinal direction ( It is provided so as to be able to swing in the two axial directions of the spindle.

Further, reference numeral 10 denotes a backing plate arranged perpendicularly to the center 9, and a semicircular notch 11 through which the center 9 can pass is formed at one end of the plate 10. At the same time, the other end of the corresponding plate 10 is attached to the tip of a piston rod 12a of an operating cylinder 12 mounted on the fixed base 1 in parallel with the center operating cylinder 8, and the operation of the operating cylinder 12 is is held in contact with or close to the top A□ of the piston A,
It is configured to restrict the swinging of the piston A, which swings back and forth, and correct it to the centered position.

In addition, 13 is a cover provided to prevent chips from scattering when cutting the outer periphery of the piston A, 14 is a cover operating cylinder for moving the cover 13 back and forth, and 15 is a guide rod for the cover 13.

Next, to explain the operation of the above embodiment, first, the piston A is fitted onto the piston holding portion 4 of the piston mounting jig 3, and then the actuation cylinder 12 is actuated to
0 is brought close to or in contact with the top part A of the piston A, and in this state, by operating the center actuating cylinder 8, the center 9 is brought into contact with the top part A □ several times (for example, three times).

Here, since the piston holding part 4 is elastically installed so as to be able to move forward and backward in the axial direction of the spindle 2, the piston A swings back and forth while contacting the backing plate 10, and this swing causes the piston A to return to its original position. Even if the device is held at a position deviated from the centering position, it is corrected to the normal centering position and held again.

After that, piston A correctly centered as above
After supporting the piston A by pressing the center 9 against the top part A, the actuating cylinder 12 is actuated to move the cover plate 10 backward, and the cover actuating cylinder 14 is actuated to move the cover 13 onto the path of the piston A. The outer periphery of the piston A can be precisely cut into a regular shape by moving the piston A, rotating the piston A, and cutting the piston A from the side using a cutting tool.

In the above embodiment, the backing plate 10 is provided with a circular notch 11 through which the center 9 can pass, but it goes without saying that this notch may be replaced with a circular hole.

As described above, according to the present invention, the center is repeatedly attached to the top of the piston while the backing plate is in contact with or close to the top of the piston, which is attached to the piston mounting jig by being pushed in the spindle axial direction. Since centering is performed by butting, the piston can always be corrected and supported at an accurate centering position, and the outer periphery of the piston can be accurately machined to the correct shape, reducing the occurrence of defective products. This is something that can be prevented.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention. Figure 1 is a side view and Figure 2 is a side view.
The figure is a front view, and FIG. 3 is an enlarged sectional view of the piston mounting jig. 1...Fixed base, 2...Spindle, 3
...Piston mounting jig, 4...Piston holding part, 4a...Skirt holding member, 4b...
... Corner holding member, 4c... Center holding member, 5.6.7... Spring, 8. Curved/center actuating cylinder, 8a... Curved piston rond, 9.Track/center, 1o..Plate with rotation, 11..notch, 12.Track/operating cylinder, 13.Track/cover, 14.
...Cylinder for cover operation, ...Guide Rondo, A/Curve Zeston. 15...

Claims (1)

[Scope of utility model registration request] a piston mounting jig which is elastically installed to be movable forward and backward in the axial direction of a spindle installed on a fixed base and has a piston holding portion that holds the piston from the inside; , a center is attached to the tip of a piston rod having a center actuating cylinder that is operated to repeatedly abut the center against the top of the piston, and a hole or notch through which the center can pass, and is fixed. When the center is repeatedly brought into contact with the top of the piston by the operating cylinder attached to the base, the plate is provided so as to come into contact with or come close to the top of the piston attached to the piston mounting jig. Features a centering device for piston machining.