JPS618251A - Tool holder - Google Patents

Abstract

PURPOSE:To perform stepless adjusting of dimension accurately by coupling the body and the holder through an annular inclined board having an inner face concentric with the center of rotation and fixing said board rotatably in circumferential direction. CONSTITUTION:A tool holder 2 is fixed with a drill 4 for cutting the section of an object having the maximum dimension through single cutter 5 while comprising a tool holder shank 6 and a drill shank 12 to form the face of the body 1 located at the machine side against the center line of the rotation of the holder or the object into right angle while the other face 13 into other angle than the right angle and to couple the body 1 and the holder 2 through an annular inclined board 3 having inner face concentric with the center of rotation. With such structure, the machining dimension can be adjusted easily by loosening the bolt 30 and turning said board 3 without tool. Furthermore, the necessary dimension can e adjusted in stepless through a scale 26 while fixing the tool.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a tool holder equipped with a tool that cuts the largest dimension of a workpiece with one cutting edge by rotating the tool or workpiece once. Regarding.

(Prior Art) The need to adjust machining dimensions without moving the center of rotation using the same tool has been keenly felt for some time. For example, when drilling a hole with a drill, if the cutting edge is slightly worn and the hole diameter decreases and falls outside the controlled dimensions, remove it and re-grind or replace the drill, even if the cutting edge is still strong enough to withstand cutting. It must be taken away. In such cases, if the machining dimensions can be easily adjusted without removing the drill, it is possible to expect a reduction in tool costs and machining time.

Furthermore, indexable drills and indexable end mills cannot be used for machining that requires precision if they cannot adjust for changes in machining dimensions due to tip corner changes or tip replacements.

Therefore, there have been no proposals for various methods of adjusting processing dimensions. For example, the one shown in Figure 1 (Tokuko Sho 5)
s-1065) has a cutting edge (B) at the tip of the tool body (A).
) and screwed into the middle of the main body.
The adjustment is made by screwing the wedge (D) into the body (A) into the main body (A), and is mainly aimed at making minute adjustments in poling processing, etc. (b) Rigidity decreases as cuts are made in the tool body. (c) The direction in which you can adjust by tightening the adjustment bolt is fine, but it is unstable in the direction in which you want to adjust by loosening it. There were drawbacks such as.

Furthermore, what is shown in Fig. 2 (Japanese Unexamined Patent Publication No. 59-19610)
In , the protrusion (B) from the center of the tool body (A) is fixed to the spindle 0) at an arbitrary position via the eccentric sleeve C14, so the maximum eccentricity position of the eccentric sleeve α◆ and the cutting edge Since the relationship with the position of (B) cannot be confirmed, the adjustment amount for the rotation angle of the eccentric sleeve 04 cannot be calculated.

Although it is effective for use within a limited range by trial, it cannot be quantitatively adjusted steplessly.

(Objective of the Invention) The present invention corrects the drawbacks of the above-mentioned proposals, and provides a tool holder that can perform necessary dimensional adjustments steplessly, accurately and quantitatively, and has good rigidity and good operability. That is.

(Description of Embodiments) An embodiment in which the present invention is applied to a tool for indexable hole drilling will be described below with reference to FIGS. 3 and 4.

In FIG. 3, (1) is the side where the tool holder is attached to the machine, and is hereinafter referred to as the main body. (2) is the side on which the tool is attached, hereinafter referred to as the holder. The inclined plate (3) is an annular plate whose inner diameter surface (7) is concentric with the rotation center αυ of the main body (1), and the main body side end face @ is a plane perpendicular to the inner diameter surface (7). Furthermore, the holder (2) side end surface (C) has a plane that is not perpendicular to the inner diameter surface (7) of the inclined plate (3).

(4) is a schematic diagram of an indexable drill, with an outer cutting tip (5) attached to the tip.

A shank (6) for attaching to a machine protrudes from the center of the main body (1), and is further fitted into the inner diameter surface (7) of the above-mentioned inclined plate (3) and the inner surface (8) of the holder (2). A matching base circle outer periphery (9) is provided. The curtain side wall αO of the main body (1) is finished in a plane perpendicular to the rotation center line αη of the main body (1). Furthermore, an escape hole α-thickness is bored in the center of the end face 03 of the main body (1) on the side of the holder (2) so as not to interfere with the main body (1) even if the shank α2 of the tool protrudes beyond the end face of the holder (2). It's being carried away. In addition, there is a screw hole α for fixing the holder (2) to the main body (1) together with the inclined plate (3) with bolts (1).
υ is drilled in two symmetrical places in the main body (1) and the holder (2), and a positioning pin aQ is provided to keep the main body (1) and the holder (2) in a constant position with respect to the rotational direction. One driving hole opening η is drilled.The outer circumference of the shank (6), the outer circumference of the base circle (9), the relief hole a →, and the screw hole α
The pitch circles of e and the pin driving hole αη are all concentric with the rotation center α of the main body (1). 2) provided through the center of
A screw hole (1) into which a bolt (to) for fixing the shank 0 is screwed is provided extending from the outer periphery of the holder (2) toward the center of the mounting hole 08 to the mounting hole QFj. or,
At the end of the main body, an inner surface (8) that fits into the base circle outer circumference (9) is provided concentrically with the mounting hole A, and the holder end surface Q1) in contact with the end surface (C) of the inclined plate (3) is provided for mounting. The center of the hole #l@
It is finished on a plane perpendicular to the surface. Further, on the opposite end surface (c), there are bolt holes (c) for inserting the bolts (to) for fixing the holder (2) to the main body (11) together with the inclined plate (3), a counterbored hole 0η, and an elongated hole that fits into the positioning pin 00. (c)
is perforated, and there is a scale (c) on the outer periphery to indicate the amount of adjustment.
is carved across 180° of the circumference.The outer diameter of the inclined plate (3) is slightly larger than the outer diameter of the main body (1) and holder (2) to facilitate rotation during dimension adjustment. It has crisscross knurling (c) all around it. Also, when the point (Q) where the thickness of the inclined plate (3) is the smallest and the outer cutter tip (5) coincide on the rotation center line αη of the main body (1), the tip (5) will rotate the main body (1). Since it is located at the farthest position from the center line αη, the machining dimensions are maximum. As the inclined plate (3) is rotated from that position, the cutting edge (5) passes along a curve close to a circle and gradually approaches the rotation center line α by approximately 90°.
Nearby, the distance becomes half the nominal outside diameter of the drill, and after that it continues to approach, and when it reaches 180 degrees and 1A, it becomes the closest, so the machining size becomes the minimum. Conversely, when the point at which the inclined plate (3) has the greatest thickness and the cutting edge (5) coincide with each other on the rotation center line, the machining dimension becomes the minimum.

This ratio is represented by the following formula: π. Inclination angle of inclined plate (3): β, radius of tool: γ, from the intersection P of the inclined surface of inclined plate (3) and rotation center line (ell), down from the cutting edge (5) to the center line of the drill (a) The perpendicular line is the center line of the drill (
Distance to the point where it intersects with a): t1 The inclined plate starts from the point where the thickness of the inclined plate (3) is the smallest and the position where the outer cutter tip (5) coincides with the rotation center line - of the main body (1). When the angle of rotation of (3) is θ, the cutting edge (5) and the rotation center line 01
The distance from R, that is, the machining radius R, is expressed by the following formula.

! == 1 +' 008θ(zsinβ−1(!0
8(K 1-00sβ month y=θ1nθ(zsinβ-1
00111θ (1-cos p month □ = A B) I Note that as seen from the above formula, the increase or decrease in the machining radius R is not proportional to the rotation angle of the inclined plate (3), so turn the scale once to obtain an equal increase or decrease. If you want, you can divide the scale (A) into unequal parts depending on the calculated value.

In the example, the relationship between the base line 0 → provided on the outer periphery of the inclined plate (3) and the scale V (a) provided on the outer periphery of the holder (2) is (+) and (-) centered on the nominal size of the drill. In order to adjust to
When the base line 0→ and the cutting edge (5) coincide on the rotation center line (11), the point on the outer periphery of the holder (2) that coincides with the base line 02 is (+
) is the maximum value, and the position 180° opposite from that point is (-) the maximum value.

In the case of the example, the '01 position, where the nominal dimensions of the tool can be machined, was a position rotated by 90 degrees and 161 degrees from the (+) maximum position.

In the case of such a structure, by rotating the inclined plate (3), the end face 0] of the holder (2) can be set to an angle that is twice the inclination angle of the 180° inclined plate (3) (-) as the apex angle. The inner surface (8) of the holder will interfere with the outer periphery (9) of the base circle because the conical surface will be in contact with the conical surface (9), but normally the amount of adjustment required is more than ±03 in diameter. Since there is almost no interference, the angle of inclination of the inclined plate (3) is very small, and the amount of interference is within the manufacturing tolerance. In order to further reduce interference, the inner surface (
8) is a short comb with a short length of contact with the base circle outer periphery (9), so in the case of the embodiment, the diameter can be adjusted by ±03 mm, but the amount of interference is about 0.002 mm, so there is no problem.

(Effects of the Invention) As described above, the tool holder according to the present invention can easily adjust the machining dimensions by loosening the bolt (T) and turning the inclined plate (3) without a tool, and since the structure is simple, the rigidity can be improved quickly. It's being carried away.

In addition, necessary dimensions can be adjusted almost steplessly quantitatively while the tool remains attached to the machine without removing the attached tool. Furthermore, the holder (2) and the main body (1) are firmly integrated against rotational torque by the positioning pin, and there are many advantages such as there is no need to tighten the bolts particularly strongly.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams of the conventional product, Figure 3 is a partial longitudinal cross-sectional view of the tool holder according to the embodiment of the present invention with the tool attached, and Figure 4 is the one shown in Figure 3 with the tool removed. FIG. (1)...Body (2)...Holder (3
)...Slanted plate (4)...Drill (5)
...Blade tip (6)...Tool holder shank (7)...Inner diameter surface (8)...Inner surface of holder (9)...Base circle outer circumference 00...Makuin side wall a
1... Rotation center line aa... To the drill shank 1... Boulder side end face of the main body a4... Relief hole αυ・
...Screw hole ←Q...Positioning pin 0η...
・Pin driving hole Ql...Mounting hole 09...Drill mounting with bolt (A)...Screw hole η...Holder end face (A)...Mounting with hole center line (C)... Opposite end face (c)... Bolt hole (c)... Long hole (c)... Scale (goods)... End face on the main body side (c)... End face on the holder side of the inclined plate -... Cross-grain knurling (1)...Bolt 0η...Counterbored hole Oa...Baseline (P)...Intersection between slope and center of rotation Agent Patent attorney Jun Kawachi Diagram 4 Procedure Correction Book August 27, 1982

Claims (1)

[Claims] A holder that attaches a tool that cuts the maximum dimension of a workpiece with a single cutting edge, consists of a holder side that attaches the tool and a main body side that attaches to a machine, and the machine side with respect to the rotation center line of the holder or workpiece. The main body and the holder are connected via an annular inclined plate having one surface at a right angle and the other surface at an angle other than the right angle, and an inner diameter surface concentric with the center of rotation, and the annular inclined plate is formed at a circular angle. A tool holder characterized by being mounted so that it can rotate in the circumferential direction.