JPS63169248A - Cutting fluid supply structure of cutting equipment - Google Patents

Abstract

PURPOSE:To keep the maintenance and accuracy of finishing of a cutting tool, by forming a coolant feeding passage in each inner part of a spindle and the tool, which supplies a coolant to the tool side from the spindle side along each turning shaft center of them. CONSTITUTION:A coolant is fed to a cutting work part from a coolant feeding device 28 through the coolant feeding passage 26 formed along each turning shaft center of a spindle 2 and a milling cutter 20 or a cutting tool. The supplied coolant flows toward an outside part from an inside part of the cutting work part by dint of centrifugal force made by rotation of the cutting tool (milling cutter) 20, and it sufficiently permeates through the whole cutting work pat, cooling the cutting work part. In consequence, discharge of sludge is favorable performable, while coolability is improved and, what is more, machining accuracy control over a workpiece to be affected by cutting temperature is made easier as much as possible.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cutting fluid supply structure for a cutting section, and is particularly suitable for application to vertical cutting equipment such as face milling machines and vertical grinding machines. This invention relates to a cutting fluid supply structure.

(Prior Art) Generally, in cutting machines such as face milling machines and vertical grinding machines, cutting fluid is supplied from a supply nozzle b provided on the outer circumference of a processing tool a, as shown in FIG. The supply nozzle b is arranged to be slanted downward toward the center of rotation of the processing tool a. , the cutting fluid is poured into the gap between the machining tool a and the machining portion d from the outside from the outside in the radial direction toward the inside.

(Problem to be solved by the invention) By the way, as mentioned above, the cutting fluid is transferred to the machining tool a and the machining surface d.
When supplying by pouring from the outside between the machining tool a
There is no particular problem when the outer diameter of the machining tool is as small as 10 to 20 mm, or when the machining tool has a rectangular shape that easily guides the cutting fluid to the center, such as an end mill. For example, the outer diameter of is 30 mm or more,
Also, if the shape makes it difficult to guide the cutting fluid to the center, the cutting fluid may be scattered around the circumference due to centrifugal force, so it is necessary to supply sufficient cutting fluid to the inner part of the cutting part. The problem was that I couldn't do it.

For this reason, the cooling performance in the inner part of the cutting part decreases,
The cutting temperature inside the cutter increases, shortening the life of the machining tool a, and also affects the finished dimensions of the workpiece C due to thermal expansion due to the temperature rise of the workpiece C and the machining tool a. There was also a risk of this happening.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to sufficiently distribute cutting fluid throughout the cutting part, thereby facilitating maintenance of processing tools and maintenance of processing accuracy. An object of the present invention is to provide a cutting fluid supply structure for a cutting device that can be easily implemented.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for supplying cutting fluid to the cutting section of vertical cutting equipment such as a face milling machine or a vertical grinding machine. In the cutting fluid supply structure, a cutting fluid supply passage is formed inside the main shaft and the tool of the cutting device to supply cutting fluid from the main shaft side to the tool side along their rotation axes, and the supply passage A cutting fluid supplying means is connected to the cutting fluid supplying structure of the cutting device.

(Function) Cutting fluid is supplied to the cutting section from the cutting fluid supply means through a cutting fluid supply passage formed along the rotation axis of the main spindle and the processing tool. The supplied cutting fluid flows from the inside to the outside of the cutting part due to the centrifugal force caused by the rotation of the processing tool, and is sufficiently distributed throughout the cutting part to cool the cutting part.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing a preferred embodiment in which a cutting fluid supply structure of a cutting device according to the present invention is applied to a face milling machine.

As shown in the figure, the main shaft 2 is rotatably provided on a box-shaped main shaft head 4 via a bearing 6, and the main shaft head 4 is provided on a column 8 for vertical IM movement. The column 8 is provided with a support arm 10 extending into the spindle head 4 , and a full-toothed gear 12 spline-fitted to the spindle 2 is mounted on the support arm 10 with a bearing 1 .
It is rotatably supported via 4. The fully toothed gear 12 is meshed with a fully toothed gear 18 fixed to the shaft end of an output shaft 16 of a power transmission system provided in the column 8, and the rotational force of the prime mover (not shown) is decelerated. and is transmitted to the main shaft 2.

A milling cutter 20, which is a processing tool, is attached to the lower end of the spindle 2 in a removable manner by press fitting (or flange connection) into a tapered hole 22 of the spindle, and a workpiece 24 is placed below the milling cutter 20. A table 25 is provided so as to be movable back and forth, left and right, and up and down.

Incidentally, inside the main spindle 2 and the milling cutter 20, there is a cutting fluid supply passage 26 along the axis of rotation of the workpiece 24 for supplying cutting fluid to the cutting part during cutting of the workpiece 24. The main shaft 2 is formed by penetrating them.
A cutting fluid supply means 28 for feeding cutting fluid into the supply passage 26 is connected to the upper end of the cutting fluid supplying means 28 .

The cutting fluid supply means 28 includes a casing 32 that surrounds the upper shaft end of the spindle 2 and is fixed to the spindle head 4 and forms a cutting fluid reservoir 30 therein, and the casing 32
The casing 32 includes a pump 36 that pumps the cutting fluid in the tank 34 to a cutting fluid reservoir 30 inside the casing 32, and the pump 36 and the casing 32 are connected by a flexible vibrator 38. The casing 32 and the main shaft 2 are rotatably sealed by a sealing material 4o, and cutting fluid is prevented from leaking from the gap between the sliding portion of the casing 32 and the main shaft 2. Further, on the side of the milling cutter 20, as in the conventional case, a cutting fluid supply nozzle 42 is fixed to the spindle head 4 and is provided to supply cutting fluid to the cutting portion from the outside in the radial direction to the inside. The flexible vibe 38 is connected to the supply nozzle 42 in a branched manner.

Therefore, in the face milling machine (cutting device) constructed in this way, when cutting the workpiece 24, the cutting fluid is injected into the cutting part between the workpiece 24 and the milling cutter 20, as in the conventional case. The feed nozzle 42 on the side of the milling cutter 20
A cutting fluid supply passage 26 is sprayed from the outside toward the rotation center of the milling cutter 20 and is formed inside the main shaft 2 and the milling cutter 20 along their rotation axes.
It is also directly supplied to the inner part of the cutting part.

Therefore, even if the milling cutter 20 has a large diameter and its blade shape prevents cutting fluid from entering from the outside, it is possible to reliably supply a sufficient amount of cutting fluid to the inside of the cutting part. The cutting fluid supplied to the inner part flows outward in the radial direction due to the action of centrifugal force, and is distributed throughout the entire cutting part.

As a result, the inner part of the cutting part can be sufficiently cooled to lower the cutting temperature, and sludge can also be removed satisfactorily. At the same time, the main spindle 2 is also cooled by the cutting fluid flowing through the cutting fluid supply passage 26 over its entire length, so thermal expansion between the workpiece 24 and the milling cutter 20 due to the cutting temperature, and thermal expansion between the main shaft 2 and the bearing 6 The machining accuracy of the workpiece, which is affected by the expansion of the spindle 2 due to the heat of sliding with the main shaft 2, can be managed as easily as possible.

On the other hand, FIG. 3 shows a modified embodiment of the present invention. As shown in the figure, in this modified embodiment, the main spindle 2 and the milling cutter 20
A cutting fluid supply passage 26 provided inside the shaft is formed by a rigid vibe member 44. A through hole 46 is formed in the main shaft 2 and the milling cutter 20 along their rotation axes, and the pipe member 44 has a bearing (not shown) inserted into the through hole 46. The upper end portion is fixed to the spindle head 4 via a bracket 48 to restrict its rotation.

In other words, in the embodiment shown in FIG. 1 described above, when the main spindle 2 is rotated at high speed to cut the workpiece 24 at high speed, the cutting fluid is applied to the inner wall surface of the supply passage 26 inside the main spindle 2 due to centrifugal force. There is a risk that it will be pressed and difficult to flow, but when rotating the main @2 at high speed like this, as in the modified embodiment shown in FIG. By inserting it through the milling cutter 20 to form a cutting fluid supply passage 26, the influence of centrifugal force can be eliminated and the cutting fluid can flow smoothly.

Note that the present invention is applicable not only to the above-mentioned face milling machine but also to any vertical cutting apparatus such as a vertical grinding machine.

(Effects) In summary, according to the present invention, a cutting fluid supply passage is formed inside the main spindle and the machining tool along their rotational axes, and the cutting fluid is supplied through the supply passage to the machining tool. Since the cutting fluid is supplied from the inside of the cutting part between the cutting part and the workpiece, a sufficient amount of cutting fluid is supplied to the entire cutting part, regardless of the diameter of the machining tool or the blade shape. The liquid can be distributed and supplied. As a result, sludge can be efficiently discharged, cooling performance is improved, and machining precision control of the workpiece, which is affected by cutting temperature, can be made as easy as possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a preferred embodiment of the cutting fluid supply structure of a cutting device according to the present invention, FIG. 2 is a schematic configuration diagram showing a modified embodiment, and FIG. 3 is a conventional cutting device FIG. 3 is a diagram showing a cutting fluid supply structure of FIG. 2... Main shaft 20... Tool milling cutter 26... Cutting fluid supply passage 28... Cutting fluid supply means 44... ...Pipe member 46...Through hole patent applicant Fuji Electrochemical Co., Ltd. Agent
Person Patent Attorney - Ken Sukedo Iro
Published by Patent Attorney Masaru Matsumoto Figure 1 Figure 2

Claims (2)

[Claims] (1) In a cutting fluid supply structure for supplying cutting fluid to the cutting section of a vertical cutting device such as a face milling machine or a vertical grinding machine, there is a main shaft and a tool inside the cutting device. A cutting fluid supply structure for a cutting device, characterized in that a cutting fluid supply passage is formed to flow the cutting fluid from the spindle side to the tool side along the rotation axis, and a cutting fluid supply means is connected to the supply passage. (2) The cutting according to claim 1, wherein the supply passage is formed by a pipe member that is inserted into a through hole passing through the main shaft and the tool and whose rotation is regulated. Cutting fluid supply structure for processing equipment.