JPS622932B2 - - Google Patents

Description

Detailed Description of the Invention (a) Field of the Invention The present invention relates to a tool holding device used for straight shank tools such as drills, reamers, end mills, etc. The present invention relates to a device that can correct tool length without removing the tool from a holding device.

(B) Description of Prior Art A conventional tool holding device for holding a straight shank tool consists of a holder body into which the tool is fitted and held, and a shank portion having a tapered surface, and one end of the holder body A tool insertion hole whose inner wall is a conical surface concentric with the central axis of the holder body is formed, and a cylindrical taper collet whose outer peripheral surface is formed with the same conical surface as the conical surface is formed in the tool insertion hole. A straight shank portion of the tool is fitted through the holder body, a tightening nut is threaded onto the outer periphery of the holder body so as to be movable in the axial direction of the holder body, and a tightening nut is loosely fitted onto the outer periphery of the holder so as to be movable in the axial direction. The tool is tightly held in the holder body by a connecting ring that connects the holder and the taper collet. Further, a screw hole having a diameter smaller than the tool insertion hole and having a screw groove carved on the inner circumferential surface is formed coaxially in parallel with the tool insertion hole, an adjustment screw is screwed into the screw hole, and the adjustment screw is screwed into the screw hole. The tool length is also corrected based on the axial position of the tool.

To correct the tool length above, use the length measuring device (tool setter) while the tool is still held in the tool holding device.
The length from a reference point formed on the tool holding device to the tip of the tool is adjusted by adjusting the axial position of the adjusting screw. Therefore, with the tool holding device, it is necessary to loosen the tightening nut on the measuring instrument and rotate the adjusting screw around the axis with the straight shank portion of the tool free relative to the holder body. In the tool holding device to which the holder is attached, after removing the tool from the tool insertion hole of the holder body, insert the driver into the tool insertion hole and engage it with the linear groove formed on the front end surface of the adjustment screw to rotate it. It's bothersome. In addition, there are special tools that have a protrusion formed on the rear end surface of the straight shank portion to engage with the groove of the adjustment screw, but this requires special processing on the tool, which increases the price. If it is difficult to engage the groove of the adjustment screw of a general-purpose tool holding device, it is troublesome to remove the tool every time adjustment is made, as with general-purpose tools.

Further, the taper shank of the tool holding device is formed with a shaft hole that communicates with the screw hole, and a bull stud for pulling the tool holding device into the taper hole of the spindle of the machine tool is screwed into the shaft hole. It is customary to correct the tool length with the bull stud attached to the length measuring device, so even if you try to turn the adjustment screw from the end of the taper shank, you will have to remove the bull stud each time. It's bothersome.

(C) Purpose of the Invention The present invention provides a tool holding device designed to hold a straight shank tool that can correct the tool length without removing the tool by simply loosening the tightening of the tool by a taper collet while holding the tool. It is an object of the present invention to provide a tool length correction device that makes it possible to

(D) Structure of the Invention The present invention has a tool mounting hole formed in the holder main body concentrically with the central axis thereof, and the outer circumferential surface of the shank portion is formed into a cylindrical surface with or without a collet in the tool mounting hole. An adjustment screw is screwed into a threaded hole formed coaxially with the tool mounting hole to hold the formed straight shank tool, and one end surface of the adjustment screw is brought into contact with the end surface of the shank portion of the straight shank tool. In the tool holding device with a tool length correction device, the tool length is corrected by rotating the adjustment screw relative to the holder main body, the thickness of the metal substrate having an equal wall thickness. A clutch plate having a rough surface portion with a large friction coefficient formed by surface processing on one of the two surfaces perpendicular to the thickness direction is attached to the opposing end surfaces of the adjustment screw and the shank portion of the straight shank tool. A rough surface portion formed on the clutch plate bonded to the adjustment screw, and a rough surface portion formed on the clutch plate bonded to the shank portion, with the rough surface portions facing each other and the other surface of the two surfaces bonded with an adhesive. The adjustment screw can be rotated by gripping and rotating the straight shank tool.

(E) Description of Embodiments FIG. 1 is a sectional view of a tool holding device suitable for using the clutch plate for tool length correction of the present invention, FIG. 2 is a front view of one embodiment of the clutch plate, and FIG. 3 shows its side view.

First, to explain the tool holding device shown in Fig. 1, the holder body 1 has a tool holding hole 2 formed at one end along its rotation center axis, and the other end has a tapered shank whose diameter decreases as it reaches the tip. It is formed in part 3.

The tool insertion hole 2 has a truncated conical surface 4 centered on the central axis of the holder body 1 on a part or all of its inner wall. The taper collet 5 has a truncated conical surface 6 formed on its outer circumferential surface and has a truncated conical surface 6 having the same apex angle as the truncated conical surface 4, and a truncated conical surface 6 on its inner circumferential surface.
A cylindrical surface 7 is formed concentrically with the cylindrical surface 7 to form a thin-walled cylindrical shape, and the truncated conical surface 6 portion of the outer peripheral surface of the cylindrical surface 7 has a
A plurality of concave grooves 8 are formed in parallel in the axial direction so as to leave a wall of an appropriate size between the concave grooves 8 and the cylindrical surface 7. Straight shank tool shank part 2
0 is fitted into and supported by the cylindrical surface 7 of the taper collet 5.

In the illustrated tool holding device, an annular driven gear 9 rotatable about the central axis of the holder body 1 is supported on the holder body 1 by a snap ring 10 so as not to move in the axial direction. A screw groove 11 is formed on the inner peripheral surface of the shaft, and a bevel gear 12 is formed on one end surface in the axial direction. On the other hand, a recess 13 formed on the side of the holder body 1
Inside, a drive gear 14 is rotatably attached to the snap spring 1 about an axis perpendicular to the central axis of the holder body 1.
5, and the drive gear 14 is provided with a bevel gear 16 that meshes with the bevel gear 12 of the driven gear 9. When the drive gear 14 is rotated, the driven gear 9 moves around the center of the holder body 1. It is decelerated and rotated.

A thread groove portion 17 is formed in a part of the outer circumferential surface of the truncated conical surface 6 of the taper collet 5 to be screwed into the thread groove 11 of the driven gear 9. Therefore, when rotating the drive gear 14 by fitting a drive rod with a hexagonal cross section into the recessed hole 18 with a hexagonal cross section cut on the central axis of the drive gear 14, the bevel gears 16, 12
The driven gear 9 is rotated about the central axis of the holder body 1 by the engagement of the driven gear 9 with the thread groove 11 formed on the driven gear 9 meshing with the thread groove 17 formed on the taper collet 5, thereby causing the taper collet 5 to rotate around the central axis of the holder body 1. It is moved in the axial direction to tighten or release the shank portion 20 of the straight shank tool.

A shaft hole 21 having a smaller diameter than the tool holding hole 2 is formed in the shank portion 3 of the tool holding device concentrically with the central axis of the holder body 1, and a shaft hole 21 having a smaller diameter than the tool holding hole 2 is formed in the portion where the shaft hole 21 communicates with the tool holding hole 2. A screw groove 2 is provided on the peripheral wall of the shaft hole 21.
2 is carved, and an adjustment screw 23 is screwed into the screw groove 22 to be slidable in the axial direction of the holder body 1. When correcting the tool length of the tool holding device, the adjustment screw 23 is inserted into the holder body 1. The tool length is corrected by rotating it around the central axis.

In the tool holding device of the present invention, a clutch plate 30 is bonded to each of the end face of the adjustment screw 23 and the end face of the shank portion 20 of the straight shank tool, and when correcting the tool length,
After loosening the taper collet, clutch plate 3
The adjustment screw 23 is intended to be rotated from the straight shank tool side through zero engagement. This clutch plate 30 is a substrate 31 which is formed by cutting out a thin metal plate having a uniform wall thickness so as to have a circular planar shape, and one of the two surfaces perpendicular to the thickness direction has a surface. A rough surface portion 32 having a large coefficient of friction is formed by processing. The surface processing is performed by, for example, mechanical processing such as knurling, or chemical processing such as electrolytic processing. In the case of knurling, the rough surface portion 32 is a surface in which pyramid-shaped minute protrusions formed by vertical and horizontal grooves are aligned. is formed. The other of the two surfaces of the substrate 31 is coated with an adhesive having excellent adhesion between metals, and the end surface and the straight shank of the adjustment screw 23 of the tool holding device that come into contact with the shank of the straight shank tool are coated on the other surface of the substrate 31. They are firmly bonded to the end surfaces of the shank portion 20 of the shank tool that come into contact with the adjustment screws 23, respectively. Suitable metal materials for the substrate 31 are brass, carbon steel, etc., and adhesives include epoxy, acrylic, cyanoacrylate, cellulose, modified acrylate, etc., which are used for metal-to-metal bonding. cellulose,
Synthetic resin adhesives such as vinyl chloride adhesives or synthetic rubber adhesives can be used.

Further, the clutch plate 30 is prepared by applying the adhesive to the other surface of the substrate 31 on which the rough surface portion 32 is formed, if necessary, and pasting release paper on the adhesive surface and storing it. It is also possible to peel off the release paper and adhere.

The clutch plate 30 is attached to the shank portion 20.
A straight shank tool is glued to the end face of the adjustment screw 2, and a clutch plate 30 is glued to the end face of the adjusting screw 2.
The holder body 1 includes a taper collet 5.
When correcting the tool length of the tool holding device, the shank portion 3 is pulled out from the cylinder of the machine tool, and the shank portion 3
It is placed on a length measuring device (tool setter) together with a pull stud (not shown) screwed into the shaft hole 21 of the tool. The drive gear 14 supported on the holder body 1 is rotated to loosen the tightening of the shank portion 20 of the straight shank tool by the taper collet 5, and while applying a pressing force to the shank portion 20 in the axial direction of the holder body 1. When applying relative rotation to the straight shank tool, the rough surface 32 of the clutch plate 30 bonded to the straight shank tool frictionally engages with the rough surface 32 of the clutch plate 30 bonded to the adjustment screw 23 for adjustment. Since the screw 23 is driven to rotate, the tool length can be corrected without removing the straight shank tool from the tool attachment hole 2 of the holder body 1.

If the rough surface portion 32 is formed by machining an extremely large number of minute protrusions protruding from the surface of the substrate 31 in an orderly manner, the rough surface portion 32 of the clutch plate 30 bonded to the straight shank tool and the adjustment screw 23 Glued clutch plate 30
The rough surface portion 32 of the tool is engaged by the meshing of these minute protrusions, thereby eliminating loss of torque transmitted from the tool to the adjustment screw 23.

(F) Effects of the Invention The present invention provides a method in which a screw hole is coaxially formed in a tool mounting hole for holding a straight shank tool, an adjustment screw is screwed into the screw hole, and the adjustment screw is rotated. In the tool holding device that corrects the tool length by adjusting the straight shank tool, clutch plates are bonded to the opposing end surfaces of the adjusting screw and the straight shank tool, respectively, so that the straight shank tool can be loosened and the straight shank tool can be adjusted. The adjusting screw can be rotated from the Yank tool side, and the clutch plate has a substrate made of a thin metal plate of uniform thickness, and has a rough surface portion with a large coefficient of friction formed on one side thereof, The other of the two surfaces is bonded to the adjustment screw of the tool holding device and the end surface of the shank portion of the straight shank tool through an adhesive having excellent adhesive strength between metals. Therefore, it is applicable to all general-purpose tool holding devices and straight shank tools equipped with the adjustment screw.

That is, in a tool holding device equipped with an adjustment screw, a straight shank tool is used with the end face of its shank portion in contact with the end face of the adjustment screw and tightened by a taper collet, and when correcting the tool length, the straight shank tool is Although the screw is rotated, the tool length is measured by bringing the end face of the shank of the straight shank tool into contact with the end face of the adjusting screw, so both the end face of the adjusting screw and the end face of the shank of the straight shank tool They are formed in a plane perpendicular to their respective central axes, and both the perpendicularity and the flatness of the end faces are formed with high accuracy. In the case of a tool holding device for attaching a general-purpose tool, a groove is formed in the adjustment screw to engage with the driver, but this groove does not interfere with gluing the clutch plate.

Therefore, by bonding a clutch plate to the end face of the adjustment screw of the tool holding device that attaches the general-purpose tool and the end face of the shank part of the general-purpose straight shank tool, the tool can be held after loosening the taper collet for tool length correction. There is no need to remove the tool from the device, and the tool length can be corrected simply by rotating the tool around its axis while supported on the taper collet, making it ideal for machining using general-purpose tool holding devices and general-purpose straight shank tools. The length correction operation can be made easier and the time required for tool correction can be shortened.

Since one side of the clutch plate is formed with a rough surface having a large coefficient of friction, torque is transmitted smoothly between the clutch plates, and the adjustment screw can be easily rotated by the force applied to the straight shank tool. be able to.

If the above-mentioned rough surface portion is formed by protruding a large number of minute protrusions arranged vertically and horizontally or radially on one surface of the substrate, then the engagement of the rough surface portion between the clutch plates is due to the engagement of the minute protrusions. Therefore, there is no loss of torque transmitted to the adjustment screw due to the engagement of both rough surface portions, and the tool length can be corrected accurately.

Further, in the tool length correction device of the present invention, a tool mounting hole is formed in the holder body concentrically with the center axis thereof, and the outer circumferential surface of the shank portion is formed into a cylindrical surface with or without a collet in the tool mounting hole. An adjustment screw is screwed into a threaded hole formed coaxially with the tool mounting hole to hold the straight shank tool, and one end surface of the adjustment screw is brought into contact with the end surface of the shank portion of the straight shank tool. Any type of tool holding device can be used as long as it is a tool holding device in which the tool length is corrected by rotating the adjustment screw relative to the holder main body. Of the two surfaces perpendicular to the thickness direction of a metal substrate having equal wall thickness, the end face of the adjusting screw of the device and the end face of the shank portion of the straight shank tool to be held by the tool holding device, respectively. A clutch plate, which has a rough surface with a large coefficient of friction formed by surface processing on one side, is bonded to the other of the two surfaces with adhesive, and attached to the end face of the shank portion of the straight shank tool. By engaging the rough surface portion formed on the bonded clutch plate with the rough surface portion formed on the clutch plate bonded to the adjustment screw, when correcting the tool length of the tool holding device that holds the tool, the tool Length measuring device (tool setter) with the holding device attached to the tool
After loosening the hold on the tool, grip the straight shank tool and rotate it while pressing it in the axial direction to adjust it through the engagement of the rough surface formed on the clutch plate. Since the screw can be rotated relative to the tool holder, the tool length can be corrected without removing the straight shank tool from the tool holder, and even when using a general-purpose straight shank tool. This has the great feature that the tool length can be corrected very easily by simply bonding the clutch plate to the end face of the shank with adhesive.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the tool holding device of the present invention, FIG. 2 is a front view of one embodiment of the clutch plate of the present invention, and FIG. 3 is a side view thereof. In the figure, 1 is the holder body, 2 is the tool mounting hole,
5 is a taper collet, 23 is an adjustment screw, 30 is a clutch plate, 31 is a base plate thereof, 32 is a rough surface portion, and 20 is a shank portion of a straight shank tool.

Claims (1)

[Claims] 1. A straight shank in which a tool mounting hole is formed in the holder body concentrically with the center axis thereof, and the outer peripheral surface of the shank portion is formed into a cylindrical surface with or without a collet in the tool mounting hole. An adjustment screw is screwed into a screw hole that is intended to hold a yank tool and is formed coaxially with the tool attachment hole, one end surface of the adjustment screw is brought into contact with an end surface of the shank portion of the straight shank tool, and the In a tool holding device in which the tool length is corrected by rotating an adjustment screw relative to the holder body, two surfaces of a metal substrate having equal wall thickness perpendicular to the direction of said wall thickness are provided. A clutch plate having a rough surface portion having a large coefficient of friction formed by surface processing on one side of the clutch plate is placed on each opposing end surface of the adjustment screw and the shank portion of the straight shank tool, with the rough surface portions facing each other. The other of the two surfaces is bonded with an adhesive, and the rough surface portion formed on the clutch plate bonded to the straight shank tool and the rough surface portion formed on the clutch plate bonded to the adjustment screw are engaged with each other. A tool length correction device in a tool holding device, characterized in that: