JP2003025183A - Method and apparatus for controlling lubricating oil discharge amount of tool holder - Google Patents

Abstract

[PROBLEMS] To lubricate a tool holder with lubricating oil, which simplifies the internal configuration of a tool holder and enables precise control of the discharge of grease discharged from the tool edge regardless of tool rotation. An oil discharge amount control method and device are provided. A grease storage chamber (3) is provided in a tool holder (TH) and a discharge means (5) for discharging a fixed amount of grease (G) in the grease storage chamber (3). 5 was operated to discharge the grease G in the grease storage chamber 3 from the tool center hole 1A in a constant amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder that stores lubricating oil such as grease, and in particular, controls the discharge amount of the grease and lubricating oil in accordance with the required amount of grease and lubricating oil required for drilling and tapping. The present invention relates to a control method and an apparatus for the control.

[0002]

2. Description of the Related Art Conventionally, there is a control technique which can control the discharge amount of grease or lubricating oil corresponding to the required amount of grease or lubricating oil required for drilling or tapping.
No. 0-513275.
The above Japanese Patent Publication No. 2000-513275 is a holder for a rotary tool such as a boring tool or a milling tool, which is a tool holder having an internal duct system for sending cooling or lubricating liquid to a mounting position of the tool. is there. And in order to allow a particularly versatile use of the machine tool, the tool holder is provided with a lubricating oil reservoir which is preferably integrated with the tool holder and which can be filled and pressurized. The lubricating oil storage chamber is separable from the cooling or lubricating liquid source during the operation of the tool, and supplies the cooling or lubricating liquid to the tool via a metering device.

According to the above tool holder, there is an advantage that the mist-like cooling or lubricating liquid can be sent out from the storage chamber in the tool holder to the processing point of the tool cutting edge, and the supply amount thereof can be controlled. However, a large number of tool holders are prepared for each tool, and the tool holders are pulled out of the spindle and replaced when the machining content is changed. For this reason, a tool holder having a complicated structure easily breaks, has poor maintainability, and is expensive, and a large number of tool holders must be mounted in the tool magazine, which is a technical and economical demerit. There is a problem. Further, since the metering valve device is controlled by the centrifugal force generated by the rotation of the tool holder, the control is governed by the rotation speed of the tool holder, so that control not related to the rotation speed of the tool holder is impossible. There is a problem to say.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a tool holder for a tool that requires cooling or supply of a lubricating liquid. The purpose of this is to simplify the internal structure of the tool holder and to precisely control the discharge of a small amount of grease discharged from the tool edge regardless of the tool rotation. It is to provide a quantity control method and apparatus.

[0005]

According to a first aspect of the present invention, there is provided a method of controlling a lubricating oil discharge amount of a tool holder, which comprises a grease storage chamber in the tool holder and a discharge unit for discharging a fixed amount of grease in the grease storage chamber. The compressed air from the compressed air source is sent into the tool holder when the spindle is installed by the operation of the open / close control valve that sends a fixed amount, and the discharge means is operated to discharge a fixed amount of grease from the tool center hole. Characterize.

According to a second aspect of the present invention, there is provided a tool holder lubricating oil discharge amount control device, wherein a grease storing chamber for storing lubricating oil such as grease in the tool holder, a discharging unit for discharging a fixed amount of grease in the grease storing chamber, and a spindle. It is provided with a compressed air source for feeding the compressed air from the compressed air source to feed the compressed air from the compressed air source in order to quantitatively discharge the discharge means. And

According to a third aspect of the present invention, there is provided a lubricating oil discharge amount control device for a tool holder, wherein a replaceable grease filling cylinder is mounted in the grease storage chamber. .

[0008]

According to the method of controlling the amount of lubricating oil discharged from the tool holder according to claim 1, the grease in the grease storage chamber provided in the tool holder operates the discharging means by the compressed air sent into the tool holder when the spindle is mounted, The amount of grease discharged from the tool center hole toward the machined surface can be finely adjusted by the number of operations of the discharging means.

As a result, in a state where the internal structure of the tool holder is simplified, the discharge control of the grease finely adjusted and discharged from the tool edge can be accurately executed regardless of the tool rotation.

Further, the discharge means is operated by an opening / closing control valve for controlling a fixed amount of air from a compressed air source,
It is possible to quantitatively discharge the optimum amount of grease necessary for processing the grease in the grease storage chamber.

Thus, the discharge control of a small amount of grease discharged from the tool edge can be accurately executed regardless of the tool rotation.

According to a second aspect of the invention, there is provided a device for controlling a lubricating oil discharge amount of a tool holder, wherein a grease storage chamber for storing lubricating oil such as grease in the tool holder, a discharging unit for discharging a fixed amount of grease in the grease storage chamber, and a spindle. It is provided with a compressed air source for operating a discharge means to be fed into the tool holder at the time of mounting, and an opening / closing control valve for controlling a fixed amount of air from the compressed air source so as to discharge the discharge means in a fixed amount. As a result, the tool holder has only a grease storage chamber and a discharge means for discharging this grease in a fixed amount, which simplifies the internal structure of the tool holder and allows smooth drilling without adverse effects of unbalance on tool rotation.・ Tap processing can be performed.

As a result, the internal structure of the tool holder can be simplified, and the discharge control of a small amount of grease discharged from the tool edge can be accurately executed regardless of the tool rotation.

In the tool holder lubricating oil discharge amount control device according to the third aspect, the grease can be simply replenished by attaching and detaching the grease filling cylinder 30. Therefore, handling of the tool holder becomes easy.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a lubricating oil discharge amount control device for a tool holder with lubricating oil and a control method for executing the same according to the present invention will be described below. FIG. 1 shows a lubricating oil discharge amount control device for a tool holder according to a first embodiment of the present invention, and FIGS. 2 and 3 are operation diagrams of the control method. Also,
FIG. 4 is a flow chart, and FIG. 5 is a relationship diagram between the amount of grease discharge and the number of piston reciprocations.

Referring to FIG. 1, a tool holder lubricating oil discharge amount control device 100 according to the present invention includes a grease storage chamber 3 for storing lubricating oil G such as grease in the tool holder TH, and a grease storage chamber 3 in the grease storage chamber 3. The discharge means 5 is provided for discharging the grease G from the center hole 1A of the cutting tool 1 to the discharge port 1B in a fixed amount. The tool holder TH has a tapered hole 13 in the spindle 10.
At the time of mounting, the compressed air E from the compressed air source E0 arranged outside passes through the opening / closing control valve 15 and the switching valve 17 via the center through 10A of the main spindle 10, and the tool holder T0.
It is connected by a pipe P so that it can be fed from a through hole A formed at the tail end of H to the discharging means 5 arranged in the upper part of the tool holder.

The open / close control valve 15 has a rotary valve structure or a rotary valve structure capable of taking three forms in which the valve body 15a connects / disconnects the compressed air source E0 and the inside of the tool holder and the inside of the tool holder to the outside air. Has a reciprocating valve structure. In the present embodiment, the valve body 15a is rotationally driven by the rotation angle control means such as the servo motor SM. Then, the compressed air E from the opening / closing control valve 15 is supplied to the through hole A opened at the tail end of the tool holder TH via the switching valve 17 for the coolant liquid C.

The discharging means 5 is installed in the through hole A on the tail end side in the tool holder, and the spring 6A causes the piston 6 to float to the tail end side, and the piston 6 has a through hole opened at the axial center. At the upper part of the hole B, a check valve 7 that closes when there is high compressed air E in the through hole A, and the pressurizing chamber 3a side when pressurized by the piston 6 that is pushed down by the compressed air E in the through hole A And a check valve 8 opening to the. Then, the compressed air source E
When the compressed air E of 0 is supplied to the through hole A opened at the tail end of the tool holder TH via the opening / closing control valve 15 and the switching valve 17, the compressed air E in the through hole A pushes down the piston 6. At the time of this depression, the check valve 7 on the upper side of the piston 6 is closed and the space S on the lower side is compressed, and the internal air E1 is forced into the pressurizing chamber 3a through the check valve 8 that opens. The upward movement of the piston 6 opens the open / close control valve 15 to the atmosphere to allow the compressed air E in the through hole A to escape to the atmosphere, thereby causing the spring 5A to float the piston 6 to the tail end side and also to the non-return state. The valve 8 is closed by the compressed air E in the pressurizing chamber 3a, and the air in the through hole A communicating with the atmosphere is sucked into the space S below the piston from the through hole B of the piston 6. As the piston 6 is moved up and down, the compressed air E in the through hole A is compressed.
It is fed into a, and the feeding amount is grasped by the predetermined number of reciprocating movements of the piston.

As shown in FIG. 5, a fixed amount of compressed air Q for fixedly discharging the grease G by actuating the discharge means 5 is controlled by a predetermined amount of reciprocating movement of the piston. With this, by controlling the number of times of opening / closing operation of the opening / closing control valve 15, the compressed air E from the compressed air source E0 pushes down the piston 7 of the discharge means 5 by a predetermined stroke amount and moves up and down a predetermined number of times to move up and down a predetermined amount. The grease G of No. 3 is discharged in a fixed amount.

The grease storage chamber 3 in which the discharge means 5 is arranged in the upper part is composed of a storage chamber 3b for storing the grease G and a pusher 4 which fits inside and is capable of moving up and down.
The upper side is a pressurizing chamber 3a, and the lower side is a storage chamber 3b for storing grease G. The pusher 4 is given a levitation force by a coil spring 9 that is pressure-fitted along the inner peripheral wall 3c of the storage chamber 3b, but is pressed down by the compressed air E supplied into the pressurizing chamber 3a. It has become. The pusher 4 moves up and down in the grease storage chamber 3 with a stroke SO, and the volume of grease G is equal to
Work from 1 discharge port 1B (drill, tap, etc.)
(Many workpieces) Can be supplied to the processed surface with W.

The tool holder lubricating oil discharge amount control device 100 according to the first embodiment of the present invention is configured as described above, and a control method for executing the lubricating oil discharge amount control device 100 will be described below. First, in FIGS.
When the cutting tool (drill / tap) T is attached to the tool holder TH, the through-hole A on the tail end side in the tool holder becomes the switching valve 17
Thus, the coolant liquid is switched to the compressed air E from the compressed air source E0. As a result, the compressed air E from the compressed air source E0 reaches the through hole A formed at the tail end of the tool holder TH from the center through 10A of the main shaft 10 via the opening / closing control valve 15 and the switching valve 17, It is fed into the discharge means 5 arranged in the upper part of the holder.

The discharging means 5 gradually supplies a predetermined amount of grease discharged by the blade T to be used to the processed surface of the work W from its discharge port 1B as the work is processed. As shown in FIG. 4, the operation of the command system of the control method is such that first, the "grease pouring operation command" (101) is transmitted in parallel with the tool change operation command transmitted from the NC control device such as a machining center. It With this command, the "command of grease discharge amount" (102) is issued and the discharge means 5
"Piston reciprocation number command" to push down the piston 7 by a predetermined stroke amount and move up and down a predetermined number of times.
(103) is output as a "command for opening / closing the opening / closing control valve 15 by M code command" (104). In response to this "command for opening / closing the opening / closing control valve 15" (104), the discharge means 5 moves the piston 7 up and down to perform "predetermined stroke compression operation in the grease storage chamber" (105) a predetermined number of times.
As a result, the pusher 4 fitted inside the grease storage chamber 3
Although the levitation force is applied by the coil spring 9 that is pressed along the inner peripheral wall 3c of the storage chamber 3b, the levitation force is gradually lowered by losing the compressed air E supplied into the pressurizing chamber 3a. Then, "a predetermined amount of grease is discharged" (106) is supplied from the discharge port 1B of the cutting tool T to the processing surface of the work W, and the supply is "finished" (107) with the processing.

Next, details of the action of the discharge means 5 and the action of discharging the grease in the grease storage chamber 3 will be described with reference to FIG.
Will be described with reference to FIG. The discharging means 5 installed in the through hole A on the tail end side in the tool holder causes the piston 6 to levitate toward the tail end side by the spring 5A, and the upper part of the through hole B opened in the axial center of the piston 6 In addition, a check valve 7 that closes when there is high compressed air E in the through hole A, and a check valve that opens to the pressurizing chamber 3a side when pressurized by the piston 6 that is pushed down by the compressed air E in the through hole A. And a valve 8. Thereby, when the compressed air E of the compressed air source E0 is supplied from the opening / closing control valve 15 to the through hole A opened at the tail end of the tool holder TH via the switching valve 17, the compressed air E in the through hole A is generated. The piston 6 is pushed down. At the time of this depression, the check valve 7 on the upper side of the piston 6 is closed and the space S on the lower side is compressed, and the internal air E1 is forced into the pressurizing chamber 3a through the check valve 8 that opens. The upward movement of the piston 6 is caused by the opening / closing control valve 1
5 is opened to the atmosphere to let the compressed air E in the through hole A escape to the atmosphere, so that the piston 6 is levitated to the tail end side by the spring 5A and the check valve 8 moves the compressed air E in the pressurizing chamber 3a. The air in the through hole A communicating with the atmosphere is sucked into the space S below the piston from the through hole B of the piston 6.

As described above, the compressed air E in the through hole A is transferred to the pressurizing chamber 3 by the vertical movement of the piston 6 and the repeated operation.
It is fed into a, and the feeding amount is determined by the predetermined number of reciprocating movements of the piston. That is, the number of repetitions of the piston, which is determined by the required grease discharge amount, is controlled by the number of opening / closing operations of the opening / closing control valve 15.
The compressed air E from 0 pushes down the piston 7 of the discharge means 5 by a predetermined stroke amount and moves up and down a predetermined number of times to discharge the grease G in the grease storage chamber 3 in a fixed amount. The opening / closing operation of the opening / closing control valve 15 can take three forms in which the valve body 15a connects and disconnects the compressed air source E0 and the inside of the tool holder and the inside of the tool holder communicates with the outside air. The valve body 15a is rotationally driven by a rotation angle control means such as a servo motor SM.

The lubricating oil discharge amount control device 100 of the tool holder TH removes the cutting tool T from the tool holder TH and leans it upside down and replenishes the inside from the through hole for replenishing grease G to the storage chamber 3b. The grease G is replenished to the storage chamber 3b with a replenisher. At the time of replenishing the grease G, the pushing body 4 is retracted inward by the coil spring 9 in the storage chamber 3b, so that the internal space is wide and the replenishment of the grease G is easy.

According to the lubricating oil discharge amount control device 100 and the control method for executing the same, the following effects are exhibited. First, the grease in the grease storage chamber provided in the tool holder operates the discharge means by the compressed air sent into the tool holder when the spindle is mounted, and the quantity of grease is measured from the tool center hole toward the machined surface by the number of times the discharge means operates. The amount of grease to be discharged can be finely adjusted. With this, in a state where the internal structure of the tool holder is simplified, the discharge control of the grease finely adjusted and discharged from the tool edge can be accurately executed regardless of the tool rotation. Further, the discharge means is operated by an open / close control valve that controls the fixed amount of air supplied from the compressed air source, and can discharge a fixed amount of the optimum amount required for processing the grease in the grease storage chamber. Thus, the discharge control of a small amount of grease discharged from the tool edge can be accurately executed regardless of the tool rotation.

Next, a lubricating oil discharge amount control device 200 according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. This embodiment has a mounting hole 35 opened in the tool holder.
A replaceable grease filling cylinder 30 is mounted in the grease storage chamber 3. This grease filling cylinder 30 is shown in FIG.
As shown in FIG. 3, a cylinder body 31 serving as a grease storage chamber 30, a pusher 4 fitted therein, and a coil spring 9 that is pressure-fitted along the inner peripheral wall 30c of the storage chamber 30b filled with grease G.
And consists of. The cylindrical body 31 has a large opening in the cylinder, and a locking portion 32 having a slightly smaller diameter is formed on the inner circumference of the end portion. Further, a through hole 34 is formed on the grease discharge side of the cylindrical body 31. Before the grease filling cylinder 30 is used, this through hole is adhered and closed by the closing seal 40, so it is peeled off immediately before or after the attachment to the tool holder.

FIG. 6 shows a state in which the grease filling cylinder 30 is attached to the tool holder. That is, in the fastening portion 41 that clamps the cutting tool 1, the male screw portion 44 is detachably screwed to the female screw portion 42 screwed on the front axis of the tool holder. When the grease filling cylinder 30 is replaced, the fastening portion 41 is removed from the female screw portion 42, and after the grease filling cylinder 30 is mounted on the tool holder, the fastening portion 41 is screwed into the female screw portion 42 and screwed.

The lubricating oil discharge amount control device 200 according to the second embodiment of the present invention is constructed as described above, and the grease can be simply replenished by attaching and detaching the grease filling cylinder 30. . Therefore, handling of the tool holder becomes easy. Other basic actions and effects are the same as the first
The description is omitted because it is the same as the embodiment.

The lubricating oil discharge amount control device of the present invention is the same as the above 2
It is not limited to one embodiment. For example, the discharging means 5 is
The piston 6 is levitated to the tail end side by the spring 5A, and a check valve 7 that closes when high compressed air E is present in the through hole A is provided above the through hole B opened in the axial center of the piston 6. The check valve 8 is opened to the pressurizing chamber 3a side when pressurized by the piston 6 which is pushed down by the compressed air E in the through hole A. However, the present invention is not limited to this configuration, and any discharging means capable of quantitatively sending the compressed air E to the pressurizing chamber 3a of the grease storage chamber 3 can be adopted. Further, the coil spring 9 of the pusher 4 provided in the grease storage chamber 3 floats the pusher 4. Therefore, even if the coil spring 9 is omitted,
The function of the lubricating oil discharge amount control device of the present invention is exerted.

Further, the opening / closing control valve 15 has a rotary valve structure of three forms in which the valve body 15a communicates / blocks the compressed air source E0 with the inside of the tool holder and the inside of the tool holder communicates with the outside air. By controlling the compressed air E, the discharge means 5 is reciprocated (moved up and down) to quantitatively send the compressed air E to the pressurizing chamber 3a of the grease storage chamber 3. Therefore, the structure of the opening / closing control valve 15 is not limited to the above.
Any open / close control valve capable of controlling the compressed air E can be adopted. Further, the model of the tool holder TH is not limited to the taper type, and the cutting tool used is not limited to the tap, and can be applied to any cutting tool (drill, end mill, milling cutter, etc.).
Furthermore, the compressed air E supplied to the grease storage chamber 3 is
The supply path is not limited to the supply path from the center through 10A of the main shaft 10, and other known supply path systems can be adopted.

[0032]

According to the first aspect of the present invention, the grease in the grease storage chamber provided in the tool holder is directed from the tool center hole toward the machined surface by the discharging means operated by the compressed air sent into the tool holder when the spindle is mounted. Since a fixed amount is discharged, the discharge control of a small amount of grease discharged from the tool edge can be accurately executed regardless of the tool rotation in a state where the internal structure of the tool holder is simplified.

The discharge means is operated by an open / close control valve for controlling the fixed amount of air supplied from the compressed air source, and discharges the optimum amount required for machining the grease in the grease storage chamber in a constant amount. Discharge control of the discharged grease can be accurately executed regardless of the tool rotation.

According to the lubricating oil discharge amount control device for a tool holder containing lubricating oil of the second aspect, a grease storage chamber for storing lubricating oil such as grease in the tool holder, and a discharge for quantitatively discharging the grease in the grease storage chamber. Means, and a compressed air source for activating the discharge means for feeding into the tool holder when the spindle is mounted,
Since the on-off control valve for controlling the fixed amount of air from the compressed air source to discharge the discharge means in a fixed amount is provided,
The tool holder has only a grease storage chamber and a discharging device that discharges this grease in a fixed amount, which simplifies the internal structure of the tool holder and allows smooth drilling and tapping without adversely affecting the tool rotation. Etc. can be executed. Further, the internal structure of the tool holder can be simplified and the discharge control of a small amount of grease discharged from the tool blade can be accurately executed regardless of the tool rotation.

According to the lubricating oil discharge amount control device for a tool holder containing lubricating oil of the third aspect, since the replaceable grease filling cylinder is mounted in the grease storage chamber, the grease can be simply replenished and the tool The holder can be handled easily.

[Brief description of drawings]

FIG. 1 is a system diagram of a lubricating oil discharge amount control device for a tool holder according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the operation of the lubricating oil discharge amount control device.

FIG. 3 is an operational cross-sectional view of a lubricating oil discharge amount control device.

FIG. 4 is a flowchart of a method for controlling a lubricant discharge amount of a tool holder.

FIG. 5 shows the first embodiment of the present invention and is a characteristic diagram of a method for controlling a lubricating oil discharge amount.

FIG. 6 is a sectional view of a lubricating oil discharge amount control device according to the second embodiment of the present invention.

FIG. 7 is a perspective view of a grease filling cylinder according to the second embodiment of the present invention.

[Explanation of symbols]

1 Cutting Tool 1A Tool Center Hole 1B Discharge Port 3 Grease Storage Chamber 3a Pressurizing Chamber 3b Storage Chamber 3c Inner Wall 4 Pusher 5 Discharge Means 5A Spring 6 Piston 7 Check Valve 8 Check Valve 9 Coil Spring 10 Spindle 10A Center Through 13 Taper hole 15 Open / close control valve 15a Valve body 17 Switching valve 30 Grease filling cylinder 30a Pressurizing chamber 30b Storage chamber 30c Inner peripheral wall 31 Cylindrical body 32 Locking portion 34 Through hole 35 Mounting hole 40 Closure seal 41 Fastening portion 42 Female screw portion 44 Male screw Parts 100, 200 Tool holder lubrication oil discharge amount control device 101 Grease pouring operation command 102 Grease discharge amount command 103 Piston reciprocation frequency command 104 Open / close control valve opening / closing frequency command 105 Pusher predetermined stroke compression operation 106 Grease Predetermined amount discharge 107 End A Through hole B Through hole TH Tool holder G Lubricant oil such as grease E0 Compressed air source Compressed air P piping SM servomotor S spatial SO stroke W workpiece

Continued front page    F-term (reference) 3C011 EE02                 4D075 AC01 AC94 AC95 CA09 CA47                       DC16 EA05 EA37                 4F041 AA01 AA16 AB01 BA04 BA13                       BA34                 4F042 AA01 AA27 BA06 BA12 CA10                       CB03 CB11

Claims (3)

[Claims] 1. A tool holder is provided with a grease storage chamber and a discharge means for discharging a fixed amount of grease in the grease storage chamber,
The compressed air from the compressed air source is sent into the tool holder when the spindle is installed by the operation of the open / close control valve that sends a fixed amount, and the discharge means is operated to discharge a fixed amount of grease from the tool center hole. And a method for controlling the amount of lubricating oil discharged from a tool holder. 2. A grease storage chamber for storing a lubricating oil such as grease in a tool holder, a discharging means for discharging a fixed amount of grease in the grease storing room, and a discharging means for feeding the grease into the tool holder when the spindle is mounted. A lubricating oil discharge amount control device for a tool holder, comprising: a compressed air source for controlling the discharge amount of the compressed air from the compressed air source; 3. The lubricating oil discharge amount control device for a tool holder according to claim 2, wherein a replaceable grease filling cylinder is mounted in the grease storage chamber.