JPS58120440A - Slip and release preventing tool holder engaged with milling chuck - Google Patents

Abstract

PURPOSE:To prevent release and slip of an end mill tool by locking a chuck having the shank of an end mill tool installed by a screw, onto a tool holder by use of steel balls, in the turn suppressed state due to a projection. CONSTITUTION:An elliptical hole into which the tongue 12 of an end mill tool 10 is inserted is formed at the rear edge of a milling chuck 2 for receiving the shank of the end mill tool 10, and the turn of said tool 10 is suppressed onto the chuck 2, and the tool 10 is fixed by a fastening screw 15. A plurality of holes 4 which penetrate in the radial direction are formed on the intermediate part of a tool holder 1. The steel balls 16 in the hole 4 are transferred in the radial direction by the vertical movement of a holding ring 7 having a stepped part 18 inside and then dropped into the cavity 8 on the milling chuck 2 to hold the chuck 2. A convex part which projects in the radial direction is formed at the lower edge of the tool holder 10 and engaged with the concaved part at the lower edge of the chuck 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device that prevents a tool related to a milling chuck from slipping or coming off.

However, when inserting and equipping the chuck with tools used for cutting or grinding in this type of work, no matter how strong the gripping and tightening is, as the number of uses increases, the tools will naturally wear out and become loose, making it impossible to simply tighten them. There is a limit.

Therefore, in the case of end mill tool machining, machining or even an N0 machine requires precision in the construction method, and the current situation is that there are many problems.

As described above, the milling chuck according to the present invention is extremely simple to use, does not cause slippage when inserting end mill tools or other tools, and has three features to prevent them from coming off. This is a tightening device that has a tightening function and does not slip or loosen or come off even if it is used many times and undergoes expansion changes due to temperature rise.

The present invention has three functions as described in detail above. In order to prevent the collet and chuck from coming off, a plurality of steel balls are inserted into the through holes provided in the upper part of the collet and placed at symmetrical positions on the chuck. Tighten the lock clamp into the semicircular ball hole provided.

In addition, in order to prevent slippage between the collet and the chuck, a flange wall is provided at the lower end of the chuck, a plurality of cut grooves are formed along the circumference of the chuck, and the cut grooves are formed along the bottom circumference of the fret. Six protrusions are formed at symmetrical positions with the insertion groove, and are engaged and tightened.

Furthermore, the chuck has an insertion hole, a control hole is formed in the upper part of the insertion hole, and an end mill is inserted into the control hole, a base is formed in the head of the end mill, and a screw hole is formed in the center. The screw-mounted base is a device with three mechanisms that pass through control holes and are tightened by screw nuts.

Hereinafter, according to the embodiment shown in the attached drawings, the fret (1) is used by inserting and fitting the chuck (2) into one side of the upper outer periphery of the cylindrical body (3) of the fret (1). A plurality of through holes (4) are bored.

Next, the chuck (2) is attached to one side of the upper outer periphery, that is, the through hole (
A plurality of semicircular ball holes (8) are formed at positions symmetrical to the holes (4), so that the balls Q6) made of steel balls are always placed in the holes (4).
), and an annular tightening retaining ring 07) fitted around the outer periphery of the main body (3) forms a lip-shaped step (1&) on the inside.

In this way, as the tightening retaining ring 0D moves up and down, the bolt ae tightens the ball hole (8) with a clamping action, holds the chuck (2) tightly, and pulls it out. This prevents it from falling off.

Shi et al., cholera) (11 has six protrusions along the circumference of the bottom (to form a force), and the chuck (2) has a flange wall (5) at the lower end, The openings are provided with mouth-shaped cut grooves (6) at symmetrical positions with the six holes (7), and the balls 116) are alternately held in place to prevent rotation.
The ball hole (8) is held in between and tightened by a double effect.

Next, six base pillars α2 are formed that protrude from the head of the end mill α1 tool, etc., and a screw hole 03) is screwed into the center of the base pillar α2, and the end mill a [the tool is inserted through the insertion hole in the center of the chuck (2). (9)
A control hole 〇〇 consisting of an elongated opening is formed in the upper part of the opening.

Therefore, the end mill α1 tool is inserted into the insertion hole (9), and the base column 0 passes through the control hole 0υ and is tightened and fixed with two screw nuts α through the washer θa, and the control hole 〇υ and This is a tightening device that can prevent slips and withdrawals due to the double tightening effect of Q51 (screw nut).

Moreover, the tightening ring (17) has a strong clamping ring (11) cut into the inner circumference with a spiral thread (20), so that the main body (3) of the collet (1) A wax thread surface (21) is cut on the outer periphery of the ring and the tightening retaining ring 07) is screwed into it.A tightening hole (22+) is provided at a distance on the outer periphery of the tightening retaining ring αη using a special spanner. It has a structure that firmly holds it tightly by transmitting light tightening with threaded tightening.

As described above, the present invention prevents milling chucks and end mill tools from slipping and coming off by double or triple strong gripping and tightening, and holds them completely tightly, especially for long periods of time. It is capable of demonstrating stable performance (tool retention) when used for a period of time.

Conventionally, in machine tools such as NC milling machining, errors in dimensional accuracy during dimensioning work were caused by weak grasping force and loosening of the tool, but the present invention improves the tightening accuracy. This is a device that focuses on improvement and prevents tool removal and slippage even if slippage or expansion of the chuck due to temperature rise occurs.The chuck is held in a strong collet using three tightening and gripping devices. Moreover, it has the uniqueness of completely tightening the tool.

This is a remarkable invention of the milling chuck.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a milling chuck combined with a collet according to the present invention. FIG. 2 is a central vertical cross-sectional view taken along the line AA'. FIG. 3 is an oblique view of the end mill tool. FIG. 4 is a longitudinal sectional view of the milling chuck. FIG. 5 is a bottom view of the same. Fig. 6 is a longitudinal cross-sectional view of the chuck in the same as above with the end mill tool inserted and tightened. Fig. 7 is a longitudinal cross-sectional view of the collet. Fig. 8 is a bottom view of the same as above. 4. Amendment to figure procedure Dear Commissioner of the Japan Patent Office 1, Indication of 1.1 Patent Office No. 212643 of 1983, Relationship with 11 cases of hli+I person Applicant+h
I will submit L. -Fig.
2 Figure A Figure 3 No.
Diagram 1

Claims (1)

[Claims] 1. A holding device for slip tightening and J-extraction tightening in which an end mill cutting tool is inserted and screwed into a milling chuck (2), and a collet (1) is inserted and tightened. The second fret (1) has a plurality of through holes (4) bored on one side of the upper outer periphery of the main body (3), and the chuck (2) (hereinafter referred to as milling) has a plurality of through holes (4) bored on one side of the upper outer periphery. A semicircular ball hole (8) is formed in the collet (1) at a symmetrical position with the through hole (4), into which a ball 06) is inserted,
A tightening retaining ring 07) is provided on its outer periphery, and as the tightening retaining ring 07) moves up and down, the ball Q6) is clamped and tightened in the ball hole (8) to prevent it from coming off. , Colette (1)
The chuck (2) has a collar wall (5) at the lower end, and the chuck (2) has a flange wall (5) at the lower end.
t. Along the circumference of the convex step (in order to alternately hold the ball 06) and the convex step (sword and incision) A tightening device that engages with the groove (6) and has a double effect.The third chuck (2) has an insertion hole (9) in the center, and the end mill OQ) tool is integrally inserted into the insertion hole (9). Equipped with a combination of equipment. However, the end mill 00 is one in which a control hole (II) consisting of an elongated opening is formed in the upper part of the insertion hole (9).
) Form a convex step base column α2 protruding from the head of the tool, screw a screw hole α3) in the center, and insert the tool into the end mill QO, pass the base column 02 through the control hole aυ, and insert the washer 0 (a). The end mill 00) tool is inserted into the control hole 0υ to control the slip with the base pillar a2, and then tighten the screw hole (15) through the screw hole (15).
[Yes] screw oak) Q! Tightening device with double effect by lit.