JPH08294801A - End part grinding method of cylindrical work and cutting tool to be used in its practice - Google Patents

Abstract

PURPOSE: To quickly perform cutting of an end surface of a cylindrical work and chamfering of its inner and outer periphery. CONSTITUTION: After an end surface 2b of a work 2 is cut in a rotating cylindrical work 2 by moving a cutting tool 6 having the tip 7 having a cutting edge forming plural V groove-shaped recessed parts 8 in the direction orthogonal to the axis of the work 2, the cutting tool 6 is moved in the axial direction so that the recessed parts 8 stride over the end surface 2b of the work 2, and both inner and outer peripheral edges 2c and 2d of the work 2 are almost simultaneously chamfered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting an end surface of a cylindrical work such as a plunger of a valve adjuster for automatically adjusting a valve clearance of an engine valve, and both inner and outer peripheral edges thereof, and the method. Bytes used directly in the implementation of.

[0002]

2. Description of the Related Art FIG. 8 shows a plunger (1) arranged in a valve adjuster (not shown). A lower end surface of the plunger (1) which is a high pressure side has a recess (1a) into which a retainer (not shown) is fitted. ) Is provided, the lower surface (1c) of the annular projection (1b) at the periphery of the concave hole (1a)
Is cut smoothly so that the length of the plunger (1) becomes the standard size, and the inner and outer peripheral edges (1) of the lower surface (1c) of the annular projection (1b) are
d) (1e) is chamfered.

Conventionally, the cutting of the lower surface (1c) of the annular projection (1b) and the inner and outer peripheral edges (1d) (1e) of the annular projection (1b) has been conventionally performed as shown in FIGS. . That is, the plunger
Work piece (2), which is a semi-finished product before (1), is gripped by a chuck (not shown) and is rotated around the central axis (L) (see FIG. 8), and is processed separately by different cutting tools. Was.

More specifically, as shown in FIG. 5, first, a known first bite (3) is advanced and retracted from the outer side of the work (2) as indicated by an arrow to chamfer the outer peripheral edge (2c). Then, as shown in FIG. 6, from the front of the work (2), a known second
Move the bite (4) back and forth as indicated by the arrow to
d) is chamfered, and then, as shown in FIG. 7, a known third cutting tool (5) is advanced and retracted from the front side of the work (2) as shown by an arrow to cut the end surface (2b). It was

In FIGS. 5 to 7, the first byte (3), the second byte (4) and the third byte (5) shown by imaginary lines are the respective bytes (3) (4) (5). 3 shows an example of the standby position of the above, and the arrows indicate the paths of the respective bytes (3) (4) (5).

The end face (2b) shown in FIG. 7 is cut first,
After that, chamfering work may be performed on the outer peripheral edge (2c) and the inner peripheral edge (2d).

[0007]

As described above, conventionally, three cutting tools (3), (4) and (5) are used for cutting at the above-mentioned three places, and the cutting is carried out individually and sequentially. There is a problem that it takes time to cut and the operating mechanism of each bite (3), (4) and (5) becomes complicated.

It is an object of the present invention to provide a method for continuously cutting the above-mentioned three places in a short time with one bite, and a dedicated bite convenient for use in carrying out the method. .

[0009]

According to the present invention, the above problems can be solved as follows. (1) While rotating a cylindrical work around an axis, a cutting tool having a cutting edge with a V-groove-shaped recess at the tip is moved in a direction orthogonal to the axis to cut the end surface of the work. Further, either before or after that, the V-groove-shaped concave portion of the cutting tool straddles the inner and outer peripheral edges of the end surface of the work, and the moving tool is moved in the axial direction toward the work, thereby The inner and outer peripheral edges of the end face of the work are chamfered almost simultaneously by the cutting edges on both inner sides.

(2) As a cutting tool to be used for carrying out the invention of the above method, a V-groove-shaped concave portion is formed at each corner, and a chip having a substantially regular polygonal shape having a cutting edge along the entire outer periphery including the concave portion is used. , Attach to the tip of the holder so that the mounting phase can be changed.

[0011]

According to the method of the present invention, with a single tool,
The cutting of the end face of the work and the chamfering of the inner and outer peripheral edges of the end face can be performed quickly, and the working time can be significantly shortened as compared with the conventional method.

Further, when the cutting tool of the present invention is used, three different cutting edge portions are machined, so that the wear of the cutting edge is not concentrated at one location, and the three cutting edge portions are made into chips. Since it can be collectively formed in a plurality of corners, the size of the entire chip and bit can be reduced.

Further, when the cutting edge at one corner of the tip is worn, the tip is rotated by a required angle, that is, the mounting phase is changed, and the tool is reattached to the holder to replace the entire bite. Can be reused without.

[0014]

1 to 4 show an example of a method for carrying out the method of the present invention. The same members as those described above are designated by the same reference numerals, and the description thereof will be omitted.

FIGS. 3 and 4 show a cutting tool (6) of the present invention. V-groove-shaped recesses (8) are formed at each corner of a substantially square chip (7). Chip containing (8)
The entire outer circumference of (7) is a cutting edge. The inner angle of each concave portion (8) is, for example, 120 °, 9 according to the angle formed by the surfaces to be chamfered between the outer peripheral edge (2c) and the inner peripheral edge (2d) of the work (2).
It is preferable to set it at 0 °, 75 °, 60 °, etc.

The front end surface of the holder (9) of the cutting tool (6) is formed in a substantially W shape so as to be substantially the same as the shape of the tip of the tip (7). A step portion (10) provided with a W-shaped engaging portion (10a) is formed.

The tip (7) has a recess (8) at the rear end and an engaging portion (1).
It is placed on the stepped portion (10) so as to be engaged with 0a) without slack, and is further fastened to the holder (9) by a bolt (11). The cutting edge at the front end of the tip (7) is preferably made to project slightly from the holder (9).

Using such a tool (6), the method of the present invention is carried out as follows. First, work (2)
As in the conventional case, the chuck is gripped and rotated at high speed around its central axis (see (L) in FIG. 8), and in that state, the bite (6) is moved to the standby position shown by an imaginary line in FIG. From
Similarly, as shown by the solid line, by moving in a direction orthogonal to the axis of the work (2), the end face (2b) of the work (2) is cut from the right corner of the tip of the tip (7), Work (2)
Determine the total length of.

The right corner of the tip of the tip (7) is the work piece.
After passing through the inner peripheral edge (2d) of the annular protrusion (2a) of (2), the tip (7)
When the concave portion (8) at the tip of the tool reaches the position where it crosses the outer peripheral edge (2c) and the inner peripheral edge (2d) of the end surface (2b) of the already cut work (2), the advancing direction of the cutting tool (6). Is changed in the axial direction of the work (2) as indicated by the solid arrow in FIG.

Then, a V-shaped concave portion at the tip of the chip (7)
The outer peripheral edge (2c) and the inner peripheral edge (2d) of the work (2) are chamfered almost at the same time by the cutting edges forming both sides inside the (8).

After the chamfering is completed, the cutting tool (6) is moved in the direction opposite to the above-described moving direction as indicated by the broken line arrow in FIG.
By advancing in a letter shape and returning to the original standby position,
One cycle ends.

The bite (6) is used as a work piece if necessary.
Move in the axial direction of (2), and then the outer peripheral edge (2c) and the inner peripheral edge first.
After chamfering with (2d), the bite (6) may be slightly returned in the axial direction, and then moved in the direction orthogonal to the axial line to cut the end face (2c). .

The chip (7) has V-groove-shaped recesses similar to those described above at the corners of a regular polygon such as a regular triangle or a regular pentagon, instead of the above-described substantially square one. You may use the thing.

[0024]

【The invention's effect】

(a) According to the method of the present invention, it is possible to rapidly perform the cutting of the end face of the work and the chamfering of the inner and outer peripheries of the end face with a single cutting tool, and the working time can be remarkably shortened as compared with the conventional method. You can

(B) When the bite of the present invention is used, three different cutting edges of the chip are machined, so that the wear of the cutting edge is not concentrated at one location, and the three Since the cutting edge portions can be collectively formed at a plurality of corners of the tip, the overall size of the tip and the cutting tool can be reduced.

(C) In addition, when the cutting edge at one corner of the chip is worn, the entire cutting tool is replaced by simply rotating the chip by the required angle, that is, changing the mounting phase and remounting the chip. Can be reused without.

[Brief description of drawings]

FIG. 1 is a partially omitted transverse plan view showing a state in which an end face of a work is being cut by a method of the present invention.

FIG. 2 is a partially omitted cross-sectional plan view showing a state in which chamfering work is also performed on the inner and outer peripheries of the end surface of the work.

FIG. 3 is a plan view of an embodiment of the cutting tool of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a partially omitted transverse plan view showing a state in which the outer peripheral edge of a work is chamfered by a conventional method.

FIG. 6 is a partially omitted transverse plan view showing a state where the inner peripheral edge of the work is also chamfered.

FIG. 7 is a partially omitted cross-sectional plan view showing a state in which an end face of a work is being cut.

FIG. 8 is a central vertical cross-sectional view of a plunger of a valve adjuster formed by processing a cylindrical work.

[Explanation of symbols]

 (1) Plunger (1a) Recessed hole (1b) Annular ridge (1c) Lower surface (1d) Inner peripheral edge (1e) Outer peripheral edge (2) Work (2a) Annular protruding ridge (2b) End surface (2c) Outer peripheral edge (2d) ) Inner peripheral edge (3) 1st bite (4) 2nd bite (5) 3rd bite (6) Bite (7) Tip (8) Recess (9) Holder (10) Step (10a) Engagement (11 ) Bolt (L) axis

Claims (2)

[Claims] 1. An end face of a work is moved by rotating a cylindrical work around an axis while moving a cutting tool having a cutting edge having a V-groove-shaped recess at its tip in a direction orthogonal to the axis. By cutting and moving the cutting tool in the axial direction toward the work such that the V-groove-shaped recess of the cutting tool straddles the inner and outer peripheral edges of the end surface of the work, either before or after cutting. A method for grinding an end portion of a cylindrical work, characterized in that both the inner and outer peripheral edges of the end surface of the work are chamfered almost simultaneously with cutting blades on both sides inside the recess. 2. A V-groove-shaped recess is formed at each corner, and a substantially regular polygonal chip having a cutting edge along the entire outer periphery including the recess is attached to the tip of the holder so that the mounting phase can be changed. A bite used for performing end grinding of a cylindrical work characterized by the above.