JPH0537442U - Cutting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To capture chips at the rear of the base of the cutting tool to reliably eliminate clogging of the ejection passage, prevent seizure of the cutting tool, and prevent its breakage. [Structure] A coolant chamber 11 that connects a supply passage 5 and a jet passage 9 is provided behind a base end of a cutting tool 4. A filter 10 that covers the inlet of the ejection passage 9 is provided at the base end of the cutting tool 4. A timer 12 for temporarily stopping the pressure feeding of the coolant C to the supply passage 5 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a cutting device, and particularly to measures against clogging of chips.

[0002]

[Prior Art]

 Conventionally, when cutting a work piece, coolant is introduced into the jet passage of a cutting tool mounted on the spindle, and the work piece is cut from the jet outlet of the jet passage toward the workpiece being cut. It is generally practiced to prevent seizure of cutting tools. The ejected coolant is usually collected and again introduced into the ejection passage of the cutting tool and ejected from the ejection port.

When the coolant is circulated in this way, chips may mix with the coolant and cause clogging, which may cause the cutting tool to seize and break, so that the coolant ejected from the ejection passage is recovered. In the current situation, a filter is provided in the inlet of the coolant tank or in the middle of the pipe to separate the chips from the coolant and prevent the chips from mixing with the coolant used for circulation.

[0004]

[Problems to be solved by the device]

 However, even though the chips are separated from the coolant as described above, the chips that are actually circulated and mixed with the coolant may clog the ejection passage of the cutting tool. In other words, in order to completely separate the chips, it is necessary to naturally reduce the mesh size of the filter, but if the mesh size of the filter becomes too small, the load of the pressure pump for pumping the coolant becomes large, which is not preferable. If the mesh of the filter is made too large, the chips will not be completely separated and will be mixed in the coolant used for circulation.

The present invention has been made in view of the above points, and an object thereof is to prevent chips from entering the ejection passage by capturing the chips behind the base end of the cutting tool. Then, it is possible to surely eliminate the clogging of the ejection passage, prevent seizure of the cutting tool, and eliminate the damage.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the solution means of the present invention according to claim 1 is a cutting device for cutting a workpiece while ejecting a coolant pumped through a supply passage of a spindle from an ejection passage of a cutting tool. A coolant chamber that connects the supply passage and the ejection passage is provided behind the base end of the tool. Further, a filter is provided at the base end of the cutting tool to cover the inlet of the ejection passage.

According to a second aspect of the present invention, there is provided a cutting device for cutting a workpiece while ejecting a coolant pressure-fed through a supply passage of a spindle from an ejection passage of a cutting tool. A coolant chamber that connects the supply passage and the ejection passage is provided at the rear. Further, a filter is provided at the base end of the cutting tool to cover the inlet of the ejection passage. In addition, a stop means for temporarily stopping the pressure feeding of the coolant to the supply passage is provided.

[0008]

[Action]

 With the above configuration, in the present invention according to claim 1 and claim 2, the coolant is pressure-fed and supplied from the supply passage of the main shaft to the coolant chamber, passes through the filter provided at the base end of the cutting tool, and then is ejected into the ejection passage. After being introduced, it is ejected toward the work from the ejection port of the ejection passage.

Therefore, even if chips are mixed in the coolant used for circulation, most of the chips are driven to the outer peripheral wall of the coolant chamber by the action of the centrifugal force due to the rotation of the spindle in the coolant chamber. The remaining small chips are also separated by the above filter to prevent the cutting tool from entering the ejection passage, so that the ejection passage is reliably clogged, and seizure of the cutting tool is prevented, resulting in breakage. Disappears. When the coolant is pressure-fed from the supply passage to the coolant chamber, it flows into the wide space from the narrow passage, so that the flow velocity decreases and the centrifugal force effectively acts.

Further, in the present invention according to claim 2, since the pumping of the coolant to the supply passage is temporarily stopped by the stopping means, at the time of this stop, the cutting pressure applied to the filter is cut by the supply pressure. The supply pressure is released, so that the chips are easily separated from the filter by the action of centrifugal force and are driven to the outer peripheral wall of the coolant chamber, so that the clogging of the ejection passage is eliminated more reliably.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cutting device according to an embodiment of the present invention. In the figure, 1 is a main shaft that rotates around its axis, 2 is a main shaft holder that rotatably holds the main shaft 1, and a tool holder 3 is provided at the tip of the main shaft 1 so as to rotate integrally. A base end side of a cutting tool 4 for cutting an inner peripheral wall of a hole w1 of a work W such as a casting is mounted on the tool holder 3 so as to rotate together.

A plurality of (only one is shown in the figure) supply passages 5, 5, ... Are radially formed around the shaft, and the outer ends of the supply passages 5 communicate with the ring groove 6. In addition, it is connected to the introduction passage 7 formed in the spindle holder 2 through the ring groove 6. Then, the coolant C pressure-fed from the pressure-feed pump 8 is always introduced from the introduction passage 7 to the supply passage 5 even when the main shaft 1 is rotating.

On the other hand, a jet passage 9 extending in the axial direction is formed in the cutting tool 4, and the tip end side of the jet passage 9 is bifurcated to form two jet outlets 9a and 9b. The coolant C, which is pressure-fed through the supply passage 5 of the main shaft 1, is introduced into the ejection passage 9 to cool the cutting tool 4 while ejecting it toward the workpiece W from the ejection outlets 9a and 9b. It is designed to cut. The ejected coolant C is collected in a coolant tank (not shown) and is reused (circulated) by the operation of the pressure pump 8. A filter 10 is provided at the base end of the cutting tool 4 to cover the inlet of the jet passage 9, and the mesh of the filter 10 is set to, for example, 20 μm. It is designed to prevent (not shown) from entering the ejection passage 9.

A coolant chamber 11 that communicates the supply passage 5 and the ejection passage 9 is formed behind the base end of the cutting tool 4, and the coolant chamber 11 is connected to the supply passage 5 from the introduction passage 7. The coolant C that has been pressure-fed through is supplied. Then, the centrifugal force due to the rotation of the main shaft 1 acts on the coolant C supplied to the coolant chamber 11, and the chips mixed in the coolant C are driven to the outer peripheral wall by the action of this centrifugal force. is there.

Further, a timer 12 as a stopping means is connected to the pressure feed pump 8, and the pressure feed of the coolant C to the supply passage 5 is temporarily stopped by the operation of the timer 12. That is, the pressure in the coolant chamber 11 is lowered by the stop of the pressure feeding, and the chips pressed against the filter 10 are easily removed.

As described above, in this embodiment, the coolant chamber 11 is formed on the rear side of the base end of the cutting tool 4 and the filter 10 is provided at the base end of the cutting tool 4, so that the cutting tool 4 is used for circulation. Most of the chips mixed in the coolant C are driven into the outer peripheral wall of the coolant chamber 11 by the action of the centrifugal force due to the rotation of the spindle 2 in the coolant chamber 11, and the remaining small chips are separated by the filter 10. Intrusion of the cutting tool 4 into the ejection passage 9 can be prevented, whereby clogging of the ejection passage 9 can be surely eliminated, seizure of the cutting tool 4 can be prevented, and breakage thereof can be eliminated. Since the coolant C is supplied from the supply passage 5 which is a narrow passage to the coolant chamber 11 which is a wide space, the flow velocity of the coolant C is reduced and the centrifugal force can be effectively applied.

Further, in the above-described embodiment, since the pressure feeding of the coolant C to the supply passage 5 is temporarily stopped by the timer 12, at the time of this stop, the supply of the coolant C to the chips pressed against the filter 10 is performed by the supply pressure. The pressure can be released, so that the chips can be easily detached from the filter 10 by the action of the centripetal force and driven to the outer peripheral wall of the coolant chamber 11, so that the clogging of the ejection passage 9 can be more reliably eliminated. You can

[0019]

[Effect of the device]

 As described above, according to the present invention as set forth in claims 1 and 2, the coolant chamber for communicating the supply passage and the jet passage is provided behind the base end of the cutting tool, and the base end of the cutting tool is provided. Since a filter covering the inlet of the jet passage was installed in the above, most of the chips mixed in the coolant were driven to the outer peripheral wall of the coolant chamber by the action of centrifugal force, and the remaining small chips were also separated by the filter. As a result, it is possible to prevent the cutting tool from entering the ejection passage, reliably prevent clogging of the ejection passage, prevent seizure of the cutting tool, and prevent its breakage. The centrifugal force can be effectively applied by reducing the flow velocity of the coolant in the coolant chamber.

Further, in the present invention according to claim 2, since the pumping of the coolant to the supply passage is temporarily stopped, the chips are not pressed against the filter at the time of stop, and the separation from the filter is facilitated. As a result, the cutting chips can be swiftly pursued to the outer peripheral wall of the coolant chamber to more reliably eliminate the clogging of the ejection passage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cutting device.

[Explanation of symbols]

 1 ... Spindle 4 ... Cutting tool 5 ... Supply passage 9 ... Jet passage 10 ... Filter 11 ... Coolant chamber 12 ... Timer (stopping means) C ... Coolant W ... Work

Claims (2)

[Scope of utility model registration request] 1. A cutting device for cutting a workpiece while ejecting a coolant pressure-fed through a supply passage of a spindle from an ejection passage of a cutting tool, the cutting device being provided at a rear end of a base end of the cutting tool. A cutting device comprising: a coolant chamber communicating with an ejection passage; and a filter provided at a base end of the cutting tool and covering an inlet of the ejection passage. 2. A cutting device for cutting a workpiece while ejecting a coolant pressure-fed through a supply passage of a spindle from an ejection passage of a cutting tool, the cutting device being provided at a rear end of a base end of the cutting tool, A coolant chamber communicating with the ejection passage, a filter provided at the base end of the cutting tool to cover the introduction port of the ejection passage, and a stop means for temporarily stopping the pressure feeding of the coolant to the supply passage are provided. A cutting device characterized by the above.