JPH042726Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tool mounting device for mounting a single tool to a cutting machine, and more particularly to a cutting tool mounting device that allows a tool holder to be easily attached and detached.

[Conventional technology] One cutting tool is attached and detached to cut the outer diameter of the workpiece.
BACKGROUND ART In a lathe that performs internal diameter cutting, thread cutting, parting work, etc., it is necessary to attach a cutting tool suitable for each work to a tool holder of the lathe. At this time, the cutting tool must match the height of the rotation center of the workpiece. Furthermore, when processing a large number of workpieces of the same shape, it is necessary to improve cutting efficiency by attaching the cutting tool's cutting edge to the same position when attaching and detaching the tool. In view of the above two requirements, the following cutting tool mounting device has been conventionally used. This conventional example will be explained using the drawings.

2, 3, and 4 are views showing a conventional example, in which FIG. 2 is a plan view, FIG. 3 is a perspective view, and FIG. 4 is a cross-sectional view taken in FIG. 2. As shown in FIG. 2, the fixing member 10 is fixed to the tool rest of the lathe,
18 are formed on two sides of the fixing member 10.
A dovetail groove 20 is formed in the tool holder 34 to which the cutting tool 40 is attached. As shown in FIG. 3, the fixing member 10 is provided with a tightening member 16 having a dovetail 18, a groove 24, and an elongated hole 44, and a lever 32 connected to an eccentric shaft 42. The tool holder 34 is provided with a height adjustment screw 36 as shown in FIG. Further, the tool holder 34 on the side surface of the height adjustment screw 36
As shown in FIG. 2, a height adjusting screw 38 having a synthetic resin formed at its tip is provided.

The dovetail groove 20 of the tool holder 34 to which the cutting tool 40 is attached engages with the dovetail 18 of the fixing member 10, and by rotating the lever 32, the eccentric shaft 42 rotates eccentrically, and the tightening member 16 moves straight. The dovetail 18 at the tip of the tool holder 34 is pressed against one of the dovetail grooves 20 of the tool holder 34, and the tool holder 34 is fixed so as to be in close contact with one surface of the fixing member 10. Since the tool holder 34 is configured to press the tool 18 against one of the dovetail grooves 20, the displacement of the tip of the cutting tool 40 is minimized when the tool holder 34 is attached or removed. Further, since the tool holder 34 is in close contact with one surface of the fixing member 10, cutting resistance is received by the surface, so that stable cutting can be performed. Dovetail grooves 20 are formed on two sides of the fixing member 10 and can be used depending on the type of cutting tool.

An elongated hole 44 is formed in the tightening member 16 in order to assemble the eccentric shaft 42, and this elongated hole 44 has no clearance with the eccentric shaft 42 in the straight direction of the tightening member 16, and the eccentric shaft 44 is formed in the direction perpendicular to the straight direction. Provide a gap with 42. A groove 24 is formed in the tightening member 16 and a rotation stop pin 22 is formed in the fixing member 10 so that the tightening member 16 moves straight without rotating.

When the dovetail 18 of the fixing member 10 and the dovetail groove 20 of the tool holder 34 are engaged, the head of the height adjustment screw 36 hits the fixing member 10 due to the weight of the tool holder 34, so the height can be adjusted. Adjustment screw 36
By rotating the cutting tool 40, the height of the center of rotation of the workpiece can be quickly and accurately matched. Cutting tool 40 when attaching and detaching tool holder 34
The rotational force of the height adjustment screw 36 is adjusted by a height adjustment screw set screw 38 having a synthetic resin at its tip so that the position of the cutting edge of the height adjustment screw 36, that is, the position of the head of the height adjustment screw 36 does not change.

[Problem that the invention attempts to solve]

However, in conventional cutting tool mounting devices, since an eccentric shaft is used, the displacement of the tightening member relative to the rotation angle of the lever is small, and a large tightening force cannot be obtained. There is a problem that the fixing force deteriorates. This causes deterioration of the surface roughness of the machined surface and damage to the cutting tool. Another problem is that the fixing force between the tool holder and the fixing member deteriorates due to wear and tear of the contact portion between the eccentric shaft and the elongated hole.

An object of the present invention is to provide a cutting tool mounting device that does not deteriorate the fixing force between the tool holder and the fixing member during heavy cutting, and allows more stable cutting.

[Means for solving problems]

In order to achieve the above object, in the present invention, the tightening member is divided into two parts that are screwed together with screws, and the tightening member is moved straight by the screw action by rotating the lever, and the tool holder and the fixing member are connected by the dovetail at the tip of the tightening member. to obtain the fixing force of

〔Example〕

Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a plan view showing the configuration of a cutting tool mounting device according to an embodiment of the present invention. The tool holder 34 to which the cutting tool 40 is attached has a dovetail groove 20 and a height adjustment screw 3.
6 is provided, and in order to adjust the rotational force of the height adjustment screw 36, a height adjustment screw set screw 38 whose tip portion is made of synthetic resin is provided on the tool holder 34. The locking shaft 12, which is connected to the lever 32 and rotates when the lever 32 is rotated, has a male thread 30 on a cylindrical surface having an axis aligned with the locking shaft 12, and a male thread 30 of the locking shaft 12. The fixing member 10 is provided with a tightening member 16 comprising a locking body 14 which has a cylindrical inner surface female thread 31 whose axes coincide with each other, and which moves in a straight line. Dovetails 18 are formed on two sides of the fixed member 10, and dovetails 18 on these two sides may be formed depending on the type of cutting tool.
Use properly.

Dovetail groove 20 of tool holder 34 and fixing member 10
The dovetail 18 is engaged, the locking shaft 12 is rotated by rotating the lever 32, and the locking body 14 having the female thread 31 screwed into the male thread 30 of the locking shaft 12 is moved straight. Press the dovetail 18 at the tip of the tool holder 34 into the dovetail groove 20 of the tool holder 34.
4 is fixed to the fixing member 10.

The circumferential groove 28 formed in the locking shaft 12 and the positioning pin 26 allow only rotational movement to be applied to the locking shaft 12, and no linear movement is applied to the locking shaft 12. Further, the groove 24 formed in the locking body 14 and the rotation stopper pin 22 provide the locking body 14 with linear movement and no rotational movement.

By changing the pitch between the male thread of the locking shaft and the female thread of the locking body, it is possible to increase or decrease the amount of linear movement of the tightening member relative to the rotation angle of the lever.

Further, although the explanation has been made using an example in which the locking shaft is threaded and the locking body is female threaded, the locking shaft may be female threaded and the locking body may be threaded.

[Effect of idea]

As is clear from the above description, the locking shaft and screw of the locking body of the present invention provide a large fixing force and reliable holding of the tool holder and the fixing member, and stable cutting can be performed.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a cutting tool mounting device according to an embodiment of the present invention, Fig. 2 is a plan view of a conventional cutting tool mounting device, and Fig. 3 is a perspective view showing a part of a conventional cutting tool mounting device. FIG. 4 is a cross-sectional view taken from FIG. 2. 10... Fixed member, 12... Locking shaft, 14...
Locking body, 16... Tightening member, 34... Tool holder.

Claims (1)

[Scope of utility model registration request] A tool holder with a height adjustment screw for adjusting the height of the cutting tool and the dovetail groove, and a tool holder that holds the cutting tool, and a dovetail that engages with the dovetail groove of the tool holder, and is fixed to the cutting machine. The fixing member is provided with a tightening member that connects to the lever, a groove provided in the tightening member, and a rotation stopper pin, and the dovetail of the fixing member and the dovetail groove of the tool holder are engaged to rotate the lever. The dovetail of the tightening member, which moves straight, is brought into pressure contact with one of the dovetail grooves of the tool holder, thereby bringing the tool holder into close contact with one surface of the fixing member, and fixing the tool holder by tightening the tool holder to the fixing member. In the cutting tool mounting device, each of the tightening members includes a locking shaft and a locking body each having a screw at one end and screwed together with the screw,
The other end of this locking shaft connects the lever, and the locking shaft is further provided with a circumferential groove and a positioning pin,
A cutting tool mounting device, characterized in that a cutting tool mounting device is formed at the other end of the locking body.