JPS63169249A - Tool holding unit for machine tool - Google Patents

Abstract

PURPOSE:To make sure of the flow and cutoff of a coolant, by installing an oil receiving cylinder, for being connected to a lubricating block of a machine tool, in a case, and furthermore, interconnecting it to an oil pass whose one end is installed in a spindle, and installing another oil pass whose other end is interconnected to an inner part of the oil receiving cylinder. CONSTITUTION:When an oil receiving cylinder 30 of a holding unit B is approximating toward a lubricating block 6 of a machine tool A, an outer cylinder 31 in this oil receiving cylinder 30 first comes contact with the lubricating clock 6, and this outer cylinder 31 is started to be pushed toward the inside of a case 12 of the holding unit B. Afterward, an inner cylinder 33 comes into contact with the lubricating block 6, and then the outer cylinder 31 and the inner cylinder 33 are pushed toward the case 12 together. The outer cylinder 31 is pushed as mentioned above, whereby a fitting piece 46 comes off a fitting part 20. And, the inner cylinder 33 is pushed as mentioned above, whereby a valve mechanism 41 is opened. Thus, a main spindle 13 is rotated by rotation of a spindle 3 and thereby a tool is rotated, while coolant to be fed out of the lubricating block 6 is giveable to the tool through the oil receiving cylinder 30, so that machining can be done in an existing state of the coolant.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a tool mounting unit for a machine tool for mounting a tool on the spindle of a machine tool, and more specifically, the present invention relates to a tool mounting unit for a machine tool for mounting a tool on the spindle of the machine tool. The present invention relates to a tool mounting unit for a machine tool that can be used in a machine tool.

(Prior art) As a tool mounting unit for this type of machine tool, on the oil receiving day to receive oil from the oil supply stand,
Some are equipped with a spring-loaded check valve. However, since the cutting oil is circulated and reused, it contains cutting chips of various sizes. Therefore, after long-term use, the cutting fluids tend to adhere to the spring, causing the spring to function more slowly than expected. Therefore, when designing the mounting unit, a spring with sufficient spring force is used so that the check valve can be operated sufficiently even in the above-mentioned situation. However, if you do this in a factory that uses a variety of machine tools from multiple companies, the supply pressure of cutting oil among those machine tools may be low. Another problem is that the check valve does not open depending on the oil pressure of the cutting oil and remains closed. If this happens, there is a problem in that cutting oil is not supplied to the tool, resulting in an accident that may seize the teeth of the tool. Conversely, if you try to use a spring with a weak spring force in the above design, if the spring force weakens due to the adhesion of cutting powder as described above, the check valve will no longer be able to perform the checking action. There is also the problem that it is difficult to use weak springs.

(Problems to be Solved by the Invention) This invention is an attempt to eliminate the above-mentioned problems of the conventional art. By moving away from the technical idea of using the machine tool to forcibly open and close the valve using mechanical movement to attach the mounting unit to the machine tool, we have developed a new approach that allows for machining with high cutting oil supply pressure. To provide a tool mounting unit for a machine tool that can appropriately open and close a valve to ensure the flow and cutoff of cutting oil, whether in a machine or a small machine tool.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Operation) When the oil receiving cylinder of the mounting unit is brought closer to the oil supply table of the machine tool, the outer cylinder of the oil receiving cylinder first contacts the oil supply stand, and the outer cylinder is pushed toward the inside of the case of the mounting unit. begins to be After that, the inner cylinder comes into contact with the oil supply base, and then the outer cylinder and the inner cylinder are pushed together toward the case. By pushing and moving the outer cylinder as described above,
The fitting piece comes off from the fitting part. Also, the valve is opened by pushing and moving the inner cylinder as described above.

(Embodiments) The drawings showing the embodiments of the present application will be explained below. A indicates a machine tool such as a machining center, and B indicates a mounting unit for attaching a tool to the machine tool. The machine tool A is a well-known one, and includes a frame 2, a spindle 3, a bearing 4, and a mounting hole 5 formed in a tapered shape. 6 is an oil supply stand attached to the frame 2, 7 is a concave hole provided at its tip, 8 is the edge of the hole, 9 is an O-ring for sealing, and 10 is a well-known pump for supplying cutting oil. It is connected like this. In addition to oil, water may also be used as the above-mentioned cutting oil, but in this specification, they are collectively referred to as cutting oil.

Next, in the mounting unit B, 12 is a case, 13 is a main shaft, and is rotatably mounted to the case 12 with a pair of bearings 15 and 15. Reference numeral 14 indicates an oil receiving mechanism provided in the case 12. In the main shaft 13, 16 is a protrusion, which is formed in a tapered shape corresponding to the mounting hole 5.

I7 is a unit gripping layer member, 18 is a fitting groove into which the toe of a manipulator (not shown) is inserted, and 19 is a fitting member retrofitted to the main shaft 13, which is provided with a concave fitting portion 20. 21
indicates the tool mounting part, and although not shown, this main shaft 13
Inside, there is a well-known channel for circulating cutting oil from the middle part held by the case 12 to the tool mounting part 21, and the channel communicates with an oil chamber 22 provided inside the case 12. ing.

Next, in the oil receiving mechanism 14, 23 indicates an oil receiving stand provided on the side of the case 12, and an oil chamber 24 is formed inside thereof. Reference numeral 25 denotes a lid body, which is fixed to the case 12 with fixing screws 26. 27 is steady, the oil chamber 22
Reference numeral 30 denotes an oil receiving cylinder which communicates the oil chamber 24 with the oil receiving cylinder, and is mounted so as to be freely movable forward and backward relative to the oil receiving stand 23 in a direction parallel to the axis of the main shaft 13. In this oil receiving cylinder 30, 31 is an outer cylinder, and 32 is an urging member for urging the outer cylinder 31 in the projecting direction, and a compression spring is used. Although not shown, a structure is provided between the outer cylinder 31 and the oil receiving stand 23 for stopping the protrusion of the outer cylinder 31 at the position shown in FIG. 1 and preventing its removal. Reference numeral 33 denotes an inner cylinder which is inserted into the outer cylinder 31 so as to be freely movable forward and backward, and is constructed by integrally connecting a first element 34 and a second element 35, each of which has a cylindrical shape, with a threaded portion 36. The outer diameter of the first element 34 in the inner cylinder 33 is set to a size that allows it to enter the recessed hole 7 in the oil supply stand 6 without a large gap. Reference numeral 37 denotes a biasing member for biasing the inner cylinder 33 in the projecting direction, and a compression spring is used. Note that removal of the inner cylinder 33 is prevented by a valve mechanism, which will be described later. Reference numeral 38 indicates a hole provided inside the second element 35, which communicates with the oil chamber 24. 39 is the first
The inner flange provided at the tip of element 34 is shown. Next, 41 indicates a valve mechanism provided within the inner cylinder 33. In this, 42 is a valve seat integrally formed with the second element 35, 43 is a valve body, and the mounting piece 4
4 is connected to a support piece 28 integrally formed with the lid body 25. Next, a fitting piece 46 screwed onto the outside of the outer cylinder 31 is for preventing rotation of the main shaft 13, and its tip 46
A is configured to prevent rotation of the main shaft 13 by fitting into the fitting portion 20. 47 indicates a locking screw of the fitting piece 46.

48 is a guide hole, 49 is a guide piece fixed to the case 12,
It is inserted into the guide hole 48 to restrict rotation of the fitting piece 46.

When the mounting unit B having the above structure is housed in the magazine, the fitting piece 46 fits into the fitting portion 20, and rotation of the main shaft 13 is prevented. Next, when installing the unit B on the machine tool aA, lift the unit B manually or with a manipulator, and install it from the bottom of the machine tool A toward the machine tool A, for example, as shown in Figure 1. Unit) Increase B. In this rising process, first, as shown in FIG.
a comes into contact with the hole edge 8 in the oil supply stand 6. As the above-mentioned upward movement continues, the outer cylinder 31 is pushed toward the inside of the oil receiving stand 23 against the urging force of the urging member 32, and eventually the third
As shown in the figure, the tip end surface 34a of the first element 34 in the inner cylinder 33 comes into contact with the hole bottom 7a of the recessed hole 7.

When the above-mentioned upward movement continues, the outer cylinder 31 and the inner cylinder 33 are pushed into the oil receiver 23 against the urging force of the urging members 32 and 37, respectively. As a result, as shown in FIG. 4, the tip 46a of the fitting piece 46 is disengaged from the fitting part 20 of the fitting member 19, and the valve seat 42 and valve body 43 of the valve mechanism 41 are separated from each other.
are separated from each other, and the valve mechanism 41 is in an open state.

Also, in this state, as is well known, the protrusion 16 is inserted into the mounting hole 5.
It is securely fixed by the well-known wedge effect.

The outer cylinder 31 from the state shown in FIG. 2 to the state shown in FIG.
The stroke (the upward stroke of the case 12 in the mounting unit B) is set to, for example, about 6 fi in order to reliably separate the tip end 46a of the fitting piece 46 from the fitting part 20, and from the state shown in FIG. The stroke of the inner cylinder 33 until reaching the state shown in FIG. 4 is set to about 172 to 173 of the stroke of the outer cylinder 31.

In this state, as is well known, the main shaft 13 is rotated by the rotation of the spindle 3, and the workpiece is machined by the tool. The oil flows from the chamber 24 to the oil passage 27 to the oil chamber 22 to the main shaft 13 to the tool and is discharged from the tool.

Next, when removing mounting unit B from machine tool A -
As is well known, the mounting unit B is moved downward away from the machine tool A. In this case, the state shown in Fig. 1 is reached through the processes shown in Figs. 4, 3, and 2, and the valve mechanism 41 is closed and the cutting oil accumulated in the ground 38, oil chamber 24, etc. flows back into the interior. It is prevented from flowing out from the cylinder 33. Further, a small amount of cutting oil remains in the space from above the valve seat 42 to the inner flange 39. However, due to the provision of the inner flange 39,
Even if the unit B is tilted during transportation after removing the mounting unit B from the machine tool A, the remaining cutting oil is unlikely to spill out, and as mentioned above, the stroke of the inner cylinder 33 can be made small. Since the space in which the cutting oil remains is small, the amount of cutting oil remaining is small, and even if it spills, there will be little negative impact on the surroundings.

(Effects of the Invention) As described above, in the present invention, when the mounting unit B equipped with a tool is connected to the workpiece mA and a workpiece is machined with the tool, the rotation of the spindle 3 causes the main shaft 13 to is rotated to rotate the tool, and the cutting oil supplied from the oil supply table 6 can be applied to the tool through the oil receiver cylinder 30, so that the workpiece can be machined by the tool in the presence of cutting oil. There are features that can be used.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a partially cutaway front view showing the mounting unit and its relationship with the machine tool, and Figs. 2 to 4 illustrate the operation of the oil receiving cylinder during the mounting process. Partial cross-sectional view. DESCRIPTION OF SYMBOLS 12... Case, 13... Main shaft, 14... Oil receiving mechanism, 30... Oil receiving cylinder, 31... Outer cylinder, 33... Inner cylinder.

Claims (1)

[Claims] The case is rotatably equipped with a main shaft, which has a connecting part to the spindle of the machine tool at one end and a tool mounting part at the other end. The case is equipped with an oil receiving cylinder, and the above case is also equipped with:
A tool mounting unit for a machine tool, characterized in that the tool mounting unit for a machine tool is provided with an oil passage whose one end communicates with an oil passage provided in the main shaft and whose other end communicates with the inside of the oil receiving cylinder.