JP4060860B2 - Air blower and mist collector in machine tools - Google Patents

Description

The present invention relates to an air blow and mist collecting device in a machine tool such as a machining center that performs processing such as drilling, threading, and grinding on a workpiece made of a metal material with a cutting tool in a sealed processing chamber.

Machine tools such as machining centers and CNC lathes perform drilling, threading, grinding, etc. on workpieces made of metal materials with cutting tools that automatically operate in accordance with a program in a closed machining chamber. The mist generated from the cutting fluid is collected by a mist collecting device attached to the processing chamber. As the mist collecting device used for such applications, various structures such as a filter method, a demister method, a collision plate method, and an electric dust collection method are known.

  Specifically, Japanese Patent Application Laid-Open No. 11-179122 discloses an intake unit that sucks gas contaminated with oil mist, and a capture unit that captures oil mist from the gas sucked from the intake unit with a porous filter, An oil mist collecting device is disclosed that includes an oil storage part that stores an aggregate of oil mist captured by the capturing part and an exhaust part that discharges a gas from which the oil mist has been removed. Japanese Patent Laid-Open No. 2000-296305 discloses that a permeable member is provided at the entrance of a hood disposed above a mist generating section, and the mist is attached to the permeable member by the operation of a suction device connected to the suction pipe of the hood. A mist collecting device for sucking and collecting an object is disclosed. Japanese Patent Laid-Open No. 9-47617 discloses a collecting plate in which a porous material layer is provided on the surface on which mist collides is provided in the collecting chamber, and the mist-containing air guided to the collecting chamber is collected in the collecting plate. A mist removing device that collects mist by colliding with the mist is disclosed.

  The mist generated in the machine tool includes water-soluble oil mist, light oil mist, and the like, and the collection / recovery system as described above is employed. However, since the filter type mist collecting device is likely to clog the filter, it is necessary to clean and inspect the filter within a short period of time, and the work is troublesome. The electric dust collection type mist collecting device has a problem that it is difficult to introduce because the equipment cost is high.

Cutting waste and cutting fluid adhere to the workpiece (workpiece) processed by a machine tool such as a machining center, so it is removed from the processing chamber after processing and then transferred to an air blow cleaning / drying device of the equipment. Cutting waste and cutting fluid are removed by air blow using compressed air (pressure: about 300 to 500 kPa) by a compressor. A large amount of oil mist and dust are scattered during the air blowing operation, and they are collected by a collecting device attached to the air blow cleaning and drying device, but the air blowing operation is performed in a sealed room. It is inevitable that some oil mist and dust will scatter around. In any case, unless the generated mists are processed efficiently, it can be said that it is difficult to make the work environment comfortable and to ensure the safety of the worker.
Japanese Patent Laid-Open No. 11-179122 JP 2000-296305 A Japanese Patent Laid-Open No. 9-47617 Japanese Patent No. 3137601 Japanese Patent Laid-Open No. 10-277506

An object of the present invention performs the collecting of the mist generated during processing as well as removed by air blow cutting debris and the cutting fluid adhering to the workpiece in a sealed processing chamber, an air blow in easy machine maintenance And providing a mist collecting device.

In order to achieve the above object, the invention described in claim 1 is such that a workpiece made of a metal material is subjected to processing such as drilling, threading, and grinding by a cutting tool in a sealed processing chamber, and the cutting fluid is used during processing. In a machine tool adapted to collect generated mists by a mist collecting device attached to the processing chamber,
A nozzle of an air blow device is provided in a support portion that supports a spindle on which the cutting tool is mounted, and the mist collecting device separates mists in the air sucked from the collecting portion provided in the processing chamber. The separation tank comprises a separation tank and suction means connected to the exhaust side of the separation tank. The separation tank has a large number of brush pieces projecting radially on a main shaft provided in the tank driven and rotated by the drive means. At least one disk-shaped rotating brush and a turn-off plate-shaped swing-off member are sequentially attached and fixed, and a cyclone formed so as to expand downward in a trumpet shape is provided downstream of the swing-off member , the outlet of the cyclone will be provided to be coupled to the suction pipe of the suction means, the workpiece by pressurized air injected from the nozzle of the air blow device Blow to wear to cutting chips and cutting fluid is removed, characterized in that the mist such air sucked from the collecting unit by the mist collecting device configured to be separated in the separation tank.

In order to achieve the same object, the invention described in claim 2 is an air blow and mist collecting device in a machine tool according to claim 1, wherein the separation tank has an annular shape with an opening formed in the center. A partition plate is provided in the tank body, and a disk-type rotary brush on the inlet side is disposed close to the partition plate, and a spiral fin is provided along the outer peripheral portion where the diameter of the cyclone is expanded. A spiral fin is provided between the disk-type rotating brush and the inner periphery of the tank body.

(Invention of Claim 1)
The air blow and mist collecting device in this machine tool removes cutting waste and cutting fluid adhering to the work piece by air blow in a sealed machining chamber of the machine tool and collects mist generated from the cutting fluid during machining. Can be done. This eliminates the need for conventional air blow cleaning / drying equipment, and eliminates the need for frequent cleaning due to filter clogging, which was a problem with filter-type mist collectors. It greatly contributes to the protection of the environment in the factory. In addition, the mist collecting device according to the present invention efficiently uses mists by a synergistic effect of a slashing action by a centrifugal force of a disk-type rotating brush, a swinging action by a centrifugal force of a swinging member, and an air flow rate reducing action by a cyclone. Can be separated and collected, maintenance is easy, and manufacturing is possible at low cost.

(Invention of Claim 2)
The air blow and mist collecting device in this machine tool is equivalent to the invention of claim 1 and has a structure suitable for collecting a large amount of mist, and the mist is produced by the rotational action of the air flow generated by the spiral fins. Since it is easy to adhere to the inner surface of the tank, the efficiency of separating and collecting mists is improved.

  The best mode of the present invention will be described below with reference to the drawings. 1 is a schematic view of a horizontal machining center to which the present invention is applied, FIG. 2 is an explanatory view showing a state in which a nozzle of an air blowing device is attached to a quill part of the machining center, FIG. 3 is an explanatory view of a roots type blower of the air blowing device, FIG. FIG. 2 is a schematic view of a mist collecting device.

  In FIG. 1, MC indicates a horizontal machining center to which an air blow and mist collecting device in a machine tool of the present invention is applied. In this machining center MC, a quill portion 3 is provided at the center of a column 2 provided on the bed 1 so as to be movable in the front-rear direction. The quill portion 3 is automatically supported in the vertical and horizontal directions. A cutting tool 15 such as a drill is automatically mounted on the spindle 4 that is freely supported. A coolant nozzle 5 is disposed around the main shaft 4 on the front surface of the quill unit 3. A carriage 7 provided with a four-sided scale 8 for fixing and holding the workpiece w is placed on the guide portion 6 disposed on one end side of the bed 1, and the carriage 7 is moved in the front-rear direction by driving means (not shown). It can be moved freely.

Reference numeral 10 denotes a processing chamber provided with an openable / closable door 11. The processing chamber 10 is hermetically provided with an internal space 12 for accommodating the bed 1, the column 2, and the carriage 7 set at a predetermined position when the workpiece w is processed. Reference numeral 13 denotes a hood-shaped collection unit for sucking mists provided at the top of the processing chamber 10.

  The nozzle body 21 of the air blow device 20 is attached to the quill portion 3 by a band-type fixture 22. As shown in FIG. 2, a flexible tube 22 provided with a large-diameter hole nozzle 23 for ejecting a large amount of air flow is connected to two portions of the front portion 21a of the nozzle body 21 respectively. In addition, a small diameter hole / deep groove nozzle 24 for ejecting high-pressure air is integrally provided at the tip of a tube portion 21b extending laterally downward from the front portion 21a of the nozzle body 21.

The connection port 21 c of the nozzle body 21 is connected to the discharge port 28 of a roots blower 27 that is appropriately disposed outside the processing chamber 10 via an air supply hose 26. As for the roots type blower 27, it is preferable to have a pressure of 30 to 40 kPa and an air amount of about 4 to 6 m ³ per minute. The air supply hose 26 is introduced into the processing chamber 10 from the top or side of the processing chamber 10.

  Thus, the cutting air and the cutting fluid adhering to the workpiece are blown off by the pressure air ejected from the large diameter hole nozzle 23 and the small diameter hole / deep groove nozzle 24 and the surface of the workpiece is dried. An air blow device 20 capable of performing

  The mist collection device 30 includes a separation tank 31 for separating mists in the air sucked from the collection unit 13 provided in the processing chamber 10 and a turbo as suction means connected to the exhaust side of the separation tank. It consists of a fan 60.

In FIG. 4, the cylindrical tank body 32 of the separation tank 31 is provided vertically by support legs 33, and the inside is partitioned into an upper introduction chamber 34 and a lower separation chamber 36. The introduction chamber 34 and the separation chamber 36 are connected via an intermediate cylinder 37. A partition plate 38 having an opening 38a having a size slightly smaller than the outer diameter of the disk-type rotary brush 45, which will be described later, is provided at the upper opening of the intermediate body 37. A suction port 35 connected to the pipe 13 a of the collection unit 13 is provided in the body portion of the introduction chamber 34, and a lid 39 is attached to the upper port of the introduction chamber 34.
Note that the introduction chamber 34, the separation chamber 36, and the intermediate cylinder 37 of the tank body 32 may have a halved structure.

  At the center of the introduction chamber 34, a main shaft 41 is inserted into a bearing member 40 attached to the lower surface of the lid 39 so that the main shaft 41 is supported vertically. The main shaft 41 has a structure that also serves as an output shaft of a motor device 42 as driving means installed on the lid 39. Nine disc-shaped rotary brushes 45 are sequentially inserted into the front end side 41a of the main shaft 41, and then a turn-off plate-shaped swing-off member 50 is fitted through a washer 49, and a nut 51 screwed into the screw shaft 41b is fitted. They are fixed by tightening. The swing-off member 50 is provided so that mists can be easily attached to the inner surface of the tank main body 32.

  The disk-type rotating brush 45 has a large number of brush pieces 47 projecting radially on the outer periphery of a fixed portion 46 in which a shaft hole for mounting on the main shaft 41 is formed, and has an outer diameter dimension of about 250 mm and a thickness dimension. : Provided at about 30 mm. For the brush piece 47, hard steel or stainless steel having a wire diameter of about 0.3 mm and a length of about 60 mm is used.

  A cyclone 52 is provided at the center of the separation chamber 36 so as to expand downward in a trumpet shape. Reference numeral 53 denotes a spiral fin provided symmetrically at two locations along the outer peripheral portion of the cyclone 52 whose diameter has been expanded. The fins 53 are provided to make it easier for mists to adhere to the inner surface of the tank body 32 by the rotational action of the air flowing into the separation chamber 36.

  A spiral fin 55 is provided along the inner side of the tank body 32 between the disc-type rotary brush 45 located at the lowermost portion of the disc-type rotary brush 45 and the cyclone 52. The fins 55 are provided with a length that is about half of the inner peripheral length of the tank body 32.

  A nozzle 57 of a water injection device 56 is disposed above the inside of the introduction chamber 34. Then, the water injection device 56 is operated automatically or manually to spray cooling water or cleaning liquid ejected from the nozzle 57 onto the brush piece 47 of the disk-type rotary brush 45, thereby attaching mists to the rotary brush 45 and separating them. -It is provided so as to promote the removal and to reduce the temperature of the air flowing into the introduction chamber 34.

  As shown in FIG. 4, a suction pipe 60 a of a turbo fan 60 is connected to the exhaust port 52 b of the cyclone 52. Reference numeral 61 denotes a drive motor for the turbo fan 60. Reference numeral 63 denotes a demister device attached to the exhaust pipe 60 b of the turbofan 60. The mist finally removed by the demister device 63 is provided so that it can be discharged from the drain pipe 64 to the outside in a timely manner.

Reference numeral 66 denotes a trap-shaped discharge pipe provided at the lower portion of the tank body 32. A discharge pipe 68 is connected to the discharge pipe 66 via a drain cock 67.
The mist collecting device 30 is configured as described above.

Next, the operation when the air blow and mist collecting device in the machine tool of the present invention is applied to the horizontal machining center MC shown in FIG. 1 will be described.
(1) In the machining chamber 10 of the machining center MC, the cutting waste and the cutting fluid adhering to the workpiece w when the workpiece w is drilled by the cutting tool 15 are used for large-diameter holes of the air blow device 20. It is blown off by the pressure air ejected from the nozzle 23 and the nozzle 24 for the small diameter hole / deep groove. The cleaning liquid adhering to the workpiece w becomes mist and scatters around.
(2) The mist generated in (1) due to the negative pressure action caused by the operation of the mist collecting device 30 is sucked into the separation tank 31 together with the surrounding air from the collecting unit 13.
(3) In the separation tank 31, the disk-type rotating brush 45 is rotated by the motor device 42 at a rotation speed within a range of 100 to 1000 rotations per minute. The air sucked into the introduction chamber 34 is made to strike the inner surface of the tank body 32 by the centrifugal force action of the rotary brush 45 and the swing-off member 50, and the mist is separated from the air and descends.
(4) Next, the air that has flowed into the separation chamber 36 once decreases the flow velocity by the cyclone 52 and flows out from the exhaust port 52b.
(5) The mist separated from the sucked air is accumulated in the lower part of the separation chamber 36 and discharged to the outside by opening the drain cock 67 in a timely manner.
(6) The dried air flowing out from the separation chamber 36 is discharged from the turbo fan 60 to the atmosphere side through the demister device 63.

  As described above, the air blow and mist collecting device in this machine tool removes cutting waste and cutting fluid adhering to the work piece by air blow in the sealed processing chamber of the machine tool and generates from the cutting fluid during machining. You can collect mist. In addition, the conventional air blow cleaning / drying device is not required, and it is very economical because it is not necessary to frequently perform cleaning due to clogging of the filter, which has been a problem in the filter type mist collecting device. .

Overview of a horizontal machining center to which the present invention is applied Explanatory drawing which shows the state which attached the nozzle of the air blow device to the quill part of the machining center Illustration of the root blower of the air blower Schematic diagram of mist collector

Explanation of symbols

MC: Machining center (machine tool)
DESCRIPTION OF SYMBOLS 10 ... Processing chamber 13 ... Collection part 15 ... Cutting tool w ... Workpiece 20 ... Air blow apparatus 23 ... Large diameter hole nozzle 24 ... Small diameter hole, deep groove use Nozzle 30 ... Mist collecting device 31 ... Separation tank 32 ... Tank body 34 ... Introduction chamber 36 ... Separation chamber 38 ... Partition plate 41 ... Main shaft 42 ... Motor device (Driving means)
45... Disc type rotating brush 50 .. swing-off member 52... Cyclone
53, 55 ... spiral fin 60 ... turbo fan (suction means)

Claims (2)

A mist collecting device in which a workpiece made of a metal material is drilled, threaded, ground, or the like processed by a cutting tool in a sealed processing chamber, and mist generated from the cutting fluid during processing is attached to the processing chamber. In machine tools that are designed to be collected by
A nozzle of an air blow device is provided in a support portion that supports a spindle on which the cutting tool is mounted,
The mist collecting device includes a separation tank that separates mists in the air sucked from a collecting unit provided in the processing chamber, and suction means connected to an exhaust side of the separation tank, In the separation tank, at least one disk-shaped rotating brush with a large number of brush pieces projecting radially and a swing-off plate-shaped swing-off member are sequentially attached to a main shaft provided in the tank driven and rotated by a driving means. A cyclone formed so as to expand downward in a trumpet shape on the downstream side of the swing-off member, and provided to connect the exhaust port of the cyclone to the suction pipe of the suction means,
The cutting air and cutting fluid adhering to the workpiece are blown off by the pressure air ejected from the nozzle of the air blowing device, and the mists in the air sucked from the collecting portion by the mist collecting device are separated from the tank. An air blow and mist collecting device in a machine tool characterized by being configured to be separated in a machine tool. The separation tank is provided with an annular partition plate having an opening at the center in the tank body, and is arranged so that a disk-type rotary brush on the inlet side is brought close to the partition plate so that the diameter of the cyclone is increased. 2. A spiral fin is provided along the outer periphery, and the spiral fin is provided along the inner periphery of the tank body between the cyclone and the disk-type rotary brush. An air blow and mist collecting device in the machine tool described in 1.

Images