JPH0418727Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a boring tool capable of thermal compensation corresponding to the workpiece.

(Prior Art) Generally, in order to accurately define the position of the cutting edge of a cutting tool of a boring tool, a fine adjustment tool is disclosed, for example, as shown in Japanese Utility Model Application Publication No. 59-39106.
In this fine adjustment tool, the cutting cartridge is arranged so that it can be moved along the axial direction by rotating a nut with a scale, and the position of the cutting edge of the cutting tool can be finely adjusted by rotating this nut with a scale. It is configured so that it can be done.

(Problem to be solved by the invention) When using such a boring tool to bore a workpiece with a large coefficient of thermal expansion, such as aluminum, if the temperature conditions such as the temperature atmosphere of the cutting oil change, Due to the difference in the materials of the workpiece and the boring bar, that is, the difference in coefficient of thermal expansion, the machining dimension of the inner diameter changes. For this reason, it is necessary to adjust the dimensions of the boring bar by taking into account the amount of change in the inner diameter dimension caused by the difference between the machining temperature and the measurement temperature. However, there is a problem in that it is difficult to make fine adjustments in response to temperature changes accurately.

This idea was made in view of the above-mentioned problems, and the purpose of this idea is to automatically adjust the process dimensions to increase the process size during high-temperature processing and reduce the process size during low-temperature processing. It is an object of the present invention to provide a boring tool that can be corrected depending on the workpiece.

(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the purpose, the boring tool according to this invention includes a boring tool body and a proximal end on the outer periphery of the boring tool body. a cutting tool mounting member having a fixed portion and a tip portion movable along the radial direction of the boring tool body;
The cutting tool attached to the tip of the cutting tool mounting member and the boring tool body are provided in a state extending along the radial direction thereof, and have the same coefficient of thermal expansion as the workpiece to be bored. a correction member formed from a material having a material having a material having a material having a correction member; and a correction member formed of a material having an adjustment screw having;
The present invention is characterized in that it includes a fixing screw that fixes the radially inner end of the correction member to the boring tool body.

(Function) In a boring tool configured as described above, the inner diameter of the hole to be machined increases as the temperature of the workpiece increases. The correction member becomes longer with the same coefficient of thermal expansion as the workpiece, and therefore the position of the cutting edge of the cutting tool also moves radially outward. In this way, processing dimensions due to temperature rise are automatically corrected.

(Example) Hereinafter, an example of a boring tool according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a boring tool 1 of an embodiment
0 includes a boring bar 12 as a boring tool body that is attached to the main shaft of a machine tool (not shown) and rotated around a horizontal axis. A recess 14 is formed along the axial direction on the top surface of the tip of the boring bar 12, and a cartridge 16 is disposed within the recess 14.

This cartridge 16 includes, as shown in the figure,
A slit 18 is formed in the middle of the lengthwise direction to divide it into front and back (left and right directions in the figure). A portion of the cutting tool 16 rearward of the slit 18 (to the left in the figure) is fixed to the bottom surface of the recess 14, that is, the boring bar 12, via a fixing screw 20. Further, the portion of the cutting tool 16 in front of the slit 18 (to the right in the figure) is elastically movable along the radial direction of the boring bar 12 due to the presence of the slit 18.

At the tip of this boring bar 12, one end is provided with a recess 14 in which the front portion of the cartridge 16 is located.
An insertion hole 22 is formed which opens at the bottom surface of the hole and whose other end terminates inside the boring bar 12 . A bushing 24 is fitted into the inner periphery of the insertion hole 22, and a correction member 26 is inserted through the bushing 24 so as to be expandable along the radial direction.

This correction member 26 has the same coefficient of thermal expansion as the workpiece to be bored and is preferably formed from the same material as the workpiece. The tip of this correction member 26 is in contact with the lower surface of the front portion of the cartridge 16 via a stopper 28 . The base end of the correction member 26 is fixed to the bottom surface of the insertion hole 22 by a fixing screw 30 inserted from below the boring bar 12.

Note that the length in the longitudinal direction of this correction member 26, that is,
Correction member 2 along the radial direction of the boring bar 12
6 is the length of the cartridge 16 in contact with the bottom surface of the recess 14 as shown in FIG. 1 at room temperature.
The tip of the adjustment member 26 is set to come into contact with the lower surface of the adjustment member 26 via a stopper 28.

Moreover, at the tip of the cartridge 16 mentioned above,
An insert chip 32 is fixed. Here, an adjustment screw 34 for initially adjusting the position of the cutting edge of the insert tip 32 is screwed onto the front part of the cartridge 16, with the lower end of the cartridge 16 in contact with the stopper 28.

Incidentally, near the base end of the boring bar 12, there is a cartridge 3 for chamfering the edge of the hole in the workpiece that has been bored by the insert tip 32.
6 is installed.

The automatic temperature correction operation of the boring tool 10 configured as described above will be described below.

First, when both the workpiece and the boring tool 10 are at room temperature, the cartridge 16 is opened as shown in FIG.
The lower surface of is adapted to abut against the bottom surface of the recess 14.

When the boring process is started from this state and the temperature of the cutting oil gradually rises, the workpiece and the adjustment member 2 of the boring tool 10 adjust according to this rise.
6's temperature will also rise. Here, as the temperature of the workpiece increases, the workpiece expands thermally,
The inner diameter of the hole to be bored also becomes larger.

On the other hand, as the temperature of the adjusting member 26 increases, the adjusting member 26 also thermally expands with the same coefficient of thermal expansion as the workpiece, and the tip of the adjusting member 26 is connected to the boring bar 12.
protrudes outward along the radial direction. Along with this protrusion, the front part of the cartridge 16 is biased radially outward via the stopper 28 as shown in FIG. 2, and the position of the cutting edge of the insert tip 32 is also moved radially outward. be done.

In this way, in this embodiment, the cutting edge position of the insert tip 32 is automatically adjusted in response to the elevated temperature environment, and the inner diameter of the hole in the workpiece to be bored is eventually adjusted to the room temperature. It will be automatically and accurately set to the value set in the state.

It goes without saying that this invention is not limited to the configuration of the one embodiment described above, and can be modified in various ways without departing from the gist of this invention.

(Effects of the invention) As detailed above, the boring tool according to the invention includes a boring tool body, the base end is fixed to the outer periphery of the boring tool body, and the tip end is fixed to the boring tool body. a cutting tool mounting member that is freely deflectable along the radial direction; a cutting tool attached to the tip of the cutting tool mounting member; and a cutting tool provided in the boring tool body in a state extending along the radial direction thereof. and a correction member formed of a material having the same coefficient of thermal expansion as the workpiece to be bored, and attached to the tip of the cutting tool attachment member so as to be movable forward and backward along the radial direction of the boring tool body. and a fixing screw that fixes the radially inner end of the correction member to the boring tool body. There is.

Therefore, according to this invention, a boring machine that can automatically correct the machining dimensions according to the temperature and the workpiece, increasing the machining dimensions during high-temperature machining and decreasing the machining dimensions during low-temperature machining. Tools will be provided.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the boring tool according to this invention at room temperature; and Fig. 2 is a partially sectional side view showing the boring tool at high temperature. be. In the figure, 10...boring tool, 12...boring bar, 14...recess, 16...cartridge,
18...slit, 20...fixing screw, 22...
Insertion hole, 24...button, 26...correction member,
28...Fixing screw, 32...Insert chip, 34...Adjusting screw, 36...Cartridge.

Claims (1)

[Claims for Utility Model Registration] (1) A boring tool body, the base end of which is fixed to the outer periphery of the boring tool body, and the distal end of which is deflectable along the radial direction of the boring tool body. a cutting tool attachment member, a cutting tool attached to the tip of the cutting tool attachment member, and a workpiece provided on the boring tool body in a state extending along the radial direction thereof, to be bored. a correction member formed of a material having the same coefficient of thermal expansion as the object; and a correction member attached to the tip of the cutting tool attachment member so as to be movable forward and backward along the radial direction of the boring tool body, A boring tool comprising: an adjusting screw having a tip abutting one end; and a fixing screw fixing a radially inner end of the correction member to the boring tool main body. (2) The boring tool according to claim 1, wherein the correction member is made of the same material as the workpiece.