Milling machine

Abstract

To provide a milling machine which can cut hard iron while having low rigidity.SOLUTION: A motor 14 with an eccentrically arranged weight is attached to a spindle 3 or a spindle attachment part 4 and rotated at high speed to provide high-speed circular motion with a small diameter to an end mill 8.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cutting technique that enables cutting of high-hardness materials such as iron using an inexpensive milling machine with low rigidity. [Background technology]

[0002] Recently, computer-controlled milling machines have become popular, but inexpensive ones use circular shafts and ball bearings in the sliding parts of each feed mechanism to keep costs down. As a result, they are not very rigid, and cannot cut hard materials such as iron, so they are only used to cut soft materials such as aluminum.

[0003] Being able to cut hard materials such as iron allows for heat treatment after cutting, which means that strong parts can be manufactured even with low-rigidity, inexpensive milling machines. This broadens the range of applications, and users therefore desire the ability to cut hard materials with inexpensive milling machines.

[0004] If this can be achieved, milling machines can be constructed using inexpensive parts, making it possible to start a business or expand a business at low cost, thereby promoting industrial development. Summary of the Invention [Problem to be solved by the invention]

[0005] When a conventional, low-rigidity, inexpensive milling machine is used to cut high-hardness metal, the end mill 8, which is rotating clockwise, is pushed to the left of arrow b due to the cutting resistance generated between the end mill 8 and the workpiece 20, causing it to deviate to the left. The speed at which the end mill 8 deviates to the left at this time is caused by the high speed rotation of the end mill 8, so the end mill 8 is pushed to the left and deviates in an instant. When the end mill 8 is cutting normally, it cuts off the amount of workpiece 20 that it can cut, but if it deviates in an instant, it will cut off a large amount of workpiece in one go, resulting in a large force being applied to the end mill, causing the blade of the end mill 8 to chip or break, or the end mill 8 to violently move around, making it impossible to cut normally. [Means for solving the problem]

[0006] A motor 14 with an eccentric weight is attached to the spindle 3 or the spindle mounting portion 4 and rotated at high speed, thereby giving the end mill 8 a small diameter, high speed circular motion. [Effects of the Invention]

[0007] If the end mill 8, which is rotating at high speed for cutting, is made to move in a small circular motion at an even higher speed, and the force of the high-speed circular motion is set to be greater than the force that tries to shift the end mill 8 due to the cutting resistance, even if the end mill 8 tries to shift to the left due to the cutting resistance, the end mill 8 will be pulled by the force of the circular motion that exceeds that force and will not be able to continue to shift to the left. By continuing to repeat this state at high speed, the end mill 8 will no longer be pushed by the cutting resistance and will not shift. As a result, the cutting will proceed according to the circular motion, and it will be possible to cut high-hardness materials such as iron even with a milling machine with low rigidity. In this case, if the blade diameter of the end mill used is about 2 mm, the diameter of the circular motion to be applied should be about 0.1 mm. The force of this circular motion can be freely set by increasing the rotation speed to make it stronger, or decreasing it to make it weaker, even if the diameter of the circular motion is the same. By cutting using a circular motion in this way, the milling machine can be constructed using inexpensive parts. Furthermore, the feeding mechanism can be made lighter, which reduces transportation costs and makes installation easier, making it possible to introduce the system with less cost and labor. [Brief explanation of the drawings] [Figure 1] FIG. 1 is a front view of an example of the present invention in which a motor 14 for generating circular motion is attached to the side of a spindle 3. [Figure 2] FIG. 2 is a side view of FIG. [Figure 3] FIG. 2 is a top view of FIG. [Figure 4] This is a front view showing the spindle and the motor for generating circular motion integrated by a pipe 19 that integrates the spindle and the motor for generating circular motion. [Figure 5] FIG. 5 is a side view of FIG. [Figure 6] FIG. 5 is a top view of FIG. [Figure 7] 3 is a diagram showing that a part of the spindle attachment portion 4 in FIG. 2 is replaced with an elastic body 31. FIG. [Figure 8] 6 is a diagram showing that a part of the spindle attachment part 4 in FIG. 5 is replaced with an elastic body 31. FIG. [Figure 9] 6 is a diagram showing a part of the mounting hole of the spindle mounting portion 4 of FIG. 5 being replaced with a cylindrical elastic body. [Figure 10] This is a diagram of the relationship between the end mill and the workpiece when cutting with a highly rigid milling machine. A groove approximately the width of end mill 8 is cut. [Figure 11] FIG. 1 is a diagram showing the relationship between an end mill 8 and a workpiece 20 when cutting with a low-rigidity milling machine. [Figure 12] This is a diagram showing the relationship between the end mill 8 and the workpiece 20 when cutting is performed by adding a circular motion to the end mill 8. The groove cut by the end mill 8 becomes wider by the amount of the circular motion. DETAILED DESCRIPTION OF THE INVENTION

[0008] An eccentric weight 10 is attached to the shaft 11 of a motor 14, and the motor 14 is attached to the spindle attachment part 4 and rotated, whereby the circular motion generated in the motor 14 is transmitted to the spindle 3 and further to the end mill 8. [Example]

[0009] FIG. 1 shows an example in which a motor 14 is attached to a spindle attachment portion 4 alongside a spindle 3, and they are driven to move in a circular motion together. [Example]

[0010] FIG. 4 shows an example in which the spindle 3 and the motor 14 for generating circular motion are integrated vertically by a pipe 19 and attached to the spindle attachment part 4 to cause the spindle 3 to make a circular motion. [Example]

[0011] 6 and 7 show an example of a measure to prevent wear of each part caused by vibration of the circular motion transmitted to the feed device by forming part of the spindle mounting part 4 with an elastic body. [Industrial Applicability]

[0012] If a low-rigidity milling machine can cut high-hardness materials, the milling machine can be constructed using inexpensive, commercially available parts, making parts readily available and manufacturing easier. As a result, milling machines capable of cutting high-hardness materials can be manufactured inexpensively. [Explanation of symbols]

[0013] 1 stepping motor 2 X-axis slide 3 spindles 4 Spindle mounting part 5 X-axis slide shaft 6 X-axis feed screw 7 Z-axis slide shaft 8 End Mill 9 Collet Chuck 10 Eccentric weight 11 Motor shaft 12 Motor bearings 13 Motor fastening screw 14 Circular motion generating motor 15 X-axis slide bearing 16 X-axis feed screw 17 Part containing the motor that generates circular motion 18. Ventilation hole for heat dissipation 19 Pipe integrating the spindle and the motor for generating circular motion 20 The part that houses the motor for the spindle 21 End mill 8 cutting edge 22 End mill 8 groove 23 Part left uncut by end mill 8 24 Excessive cutting area by end mill 8 25 Right end of the groove cut by end mill 8 26 Left end of the groove cut by end mill 8 27 Center line of circular motion of end mill 8 28 The actual arc portion that was cut 29 Right edge of the groove that was actually cut 30 Left edge actually scraped 31 Elastic Body 32 Cylindrical elastic body 33 Slide part of spindle mounting part 4 a Arrow indicating the direction of travel of end mill 8 b Arrow indicating the direction in which the end mill deviates due to cutting resistance c Arrow indicating the rotation direction of the end mill d Center line before end mill 8 is displaced due to cutting resistance d´ Center line when end mill 8 is displaced due to cutting resistance

Claims

1. A milling machine that performs cutting by further circular motion of a rotating end mill, and a mechanism that further circular motion of a rotating end mill.

2. 2. The milling machine according to claim 1, wherein a motor for generating circular motion is attached to the spindle mounting portion in a row, and a mechanism for further circularly moving the rotated end mill.

3. 2. A milling machine as described in claim 1, wherein the spindle 3 and the motor 14 for generating circular motion are integrated by a pipe 19 that integrates the spindle and the motor for generating circular motion, and the integrated motor is attached to the spindle mounting portion 4, and a mechanism for further circularly moving the rotated end mill.

4. 2. The milling machine according to claim 1, wherein a part of the spindle mounting portion (4) is formed of an elastic body (31), and a mechanism for further circularly moving the rotating end mill.

5. 2. A milling machine as claimed in claim 1, and a mechanism for further circularly moving the rotated end mill, wherein a cylindrical elastic body 32 is formed between the pipe 19 integrating the spindle and the motor for generating circular motion and the spindle mounting portion 4.

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