JP2006292089A - Joint for semi-dry processing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently supply an oil mist of microscopic oil spots to the front edge of a tool when a semi-dry processing is conducted with spindle through machine tools. <P>SOLUTION: A joint for the semi-dry processing is provided with a processed oil supply connector 12 to which an outside processed oil supply source is connected, a gas supply connector 3 to which an outside gas supply source is connected, a processed oil supply passage 13 communicating with the processed oil supply connector, a porous body 14 to which the processed oil is supplied from the supply passage while it is connected with the processed oil supply passage, gas supply passages 4, 5 in which droplets of processed oil are mixed by bringing the gas supplied into contact with the surface of the porous body 14, while communicating with the gas supply connector 3, a mist jetting orifice 6 to jet mist outside, communicating with the gas supply passage, and an interlock 7 which is connected with machine tools so that the mist jet orifice can communicate with an axial hole of the spindle through machine tool. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a semi-dry joint for supplying oil mist to the tip of a processing tool when performing semi-dry processing with a spindle-through machine tool.

  Spindle-through machine tools that supply machining fluid from the tip of a rotating tool used to supply a large amount of water-soluble machining fluid at high pressure, so there was no supply failure. There is a demand for semi-dry processing. There are two conventional methods for handling semi-dry machining with the same mechanical structure. One has a mixing unit integrated with the processing oil tank outside the machine, where air and the processing oil are mixed to form a mist. There is a method of guiding to the rotating spindle through a pipe (for example, Patent Document 1). Secondly, the processing oil tank has a pump to intermittently discharge the processing oil by a specified amount and convey it to the mixing block built in the machine, where it mixes with air to generate mist and supply it to the rotating spindle It is a method to do.

The latter method will be described with reference to FIG.
The mixing block 20 has an inner tube 21 on the rear side and an outer tube 22 connected to the distal end side of the inner tube 21, and the inner tube 21 is configured to be supplied with processing oil from the rear end. ing. The outer tube 22 extends to the distal end side, and is provided at the base end portion of the inner tube 21 in the vicinity of the outer peripheral portion of the inner tube 21. The distal end is a mist injection unit 24. Therefore, the air introduced from the air intake port 23 of the outer tube 22 is configured to flow from the vicinity of the tip of the inner tube 21 toward the mist injection unit 24. A pipe 25 for supplying mist to the machine tool is connected to the mist injection section 24. In the mixing block 20, the working oil is supplied from the inner pipe 21 and air is taken into the outer pipe 22 from the air intake 23. . Then, as the air flows from the vicinity of the tip of the inner tube 21 toward the mist injection unit 24, it is mixed with the processing oil supplied from the inner tube 21, and the processing oil is made into droplets. The liquid droplets are ejected forward together with air from the mist ejecting section 24 and supplied to the machine tool through the pipe 25.
JP 2001-82685 A

However, in the first method, the distance to be transported after mist formation is very long, and mist adheres to the wall surface of the pipe or stays at the joint until it reaches the processing point. It is not preferable as an oil transfer function. Further, since the processing oil is atomized by negative pressure, the amount of processing oil supplied cannot be numerically controlled. Furthermore, since the loss of processing oil on the way is large, there may be a shortage of processing oil supply, and in many cases, additional mist is supplied by adding a mixing block just before entering the rotating spindle. This goes against reducing the amount of oil used.
In the second method, mixing block piping is added in advance to the rotary joint attached to the rear end of the main spindle, and mist is supplied. Inevitable. Moreover, even if such a mixing block is attached to the rotary joint, there is a problem that the size of the mist varies and a good mist cannot be supplied to the processing point.

  The present invention has been made against the background of the above circumstances, and relates to a joint for semi-dry machining that enables fine semi-dry machining by effectively sending a fine mist to a machining point in a spindle-through machine tool. .

  That is, among the inventions of the joint for semi-dry machining according to the present invention, the invention according to claim 1 is a gas supply in which a processing oil supply connection portion to which an external processing oil supply source is connected and an external gas supply source is connected. A connecting portion; a processing oil supply passage communicating with the processing oil supply connecting portion; a porous body connected to the processing oil supply passage and supplied with processing oil from the supply passage; and communicating with the gas supply connecting portion. The gas to be supplied is brought into contact with the surface of the porous body to mix the droplets of the processing oil, and the gas mixed with the droplets is jetted to the outside in communication with the gas supply channel. A mist injection port, and a connecting portion connected to the machine tool are provided so that the mist injection port communicates with a shaft hole of a spindle-through machine tool.

  According to a second aspect of the invention of the joint for semi-dry processing according to the first aspect, in the first aspect of the invention, the connecting portion is formed in a convex shape and is fitted and connected to a concave shape provided in the machine tool. Features.

  According to a third aspect of the invention of the joint for semi-dry processing, in the first or second aspect of the invention, the porous body and the mist injection port are located in the connecting portion.

  The invention for a joint for semi-dry machining according to claim 4 is the invention according to any one of claims 1 to 3, wherein a processing oil supply path extends toward the mist injection port, and a porous body is provided at a tip thereof. The gas supply path is hung from the rear to the front of the porous body, is coaxially positioned on the outer peripheral side of the processing oil supply path, extends forward, and communicates with the mist injection port. It is characterized by.

According to the present invention, an external processing oil supply source is connected to the processing oil supply connection portion, and the processing oil is supplied from the processing oil supply source to a processing oil supply path communicating with the processing oil supply connection portion. Further, an external gas supply source is connected to the gas supply connection portion, and gas is supplied from the gas supply source to a gas supply path communicating with the gas supply connection portion.
The processing oil flows out to the surface through the porous body through the processing oil supply path to form microdroplets and a liquid film. The gas flowing through the gas supply path flows so as to contact the porous body. The effluent on the surface of the porous body is engulfed in this gas flow, and remains as microdroplets, or is further divided into microparticles and mixed into the gas. As a result, a stable fine processing oil mist can be obtained immediately without generating processing oil droplets having a large particle diameter. This mist is injected from the mist injection port connected to the gas supply path without requiring piping or the like, and is supplied to the machining point through the shaft hole of the machine tool.

  The joint of the present invention is connected to a rotary joint of a machine tool by a connecting portion. The structure of the connecting portion is not particularly limited as the present invention, and any structure may be used as long as it can introduce the mist injected from the mist injection port into the shaft hole of the machine tool. A structure etc. are required. For example, the joint according to the present invention can be connected to the machine tool by screwing the connecting portion of the joint according to the present invention, which is a male thread having a mist injection port, into the female thread of the machine tool communicating with the shaft hole. In addition, by making the connecting portion detachable from the machine tool, the joint of the present invention is appropriately connected to the machine tool that performs semi-drying to efficiently and reliably supply the processing oil mist of fine oil droplets. be able to. Therefore, the joint of this invention is excellent also in the handleability. In particular, by using a common connection structure on the machine tool side, it can be applied to a large number of machine tools as required using a small number of joints.

As described above, when connecting, it is desirable to connect the connecting portion of the joint of the present invention having a convex shape to the recess of the machine tool. As a result, the joint can be brought closer to the machine tool, and the moving path of the mist can be made as short as possible. In particular, since the porous body and the mist injection port are located at the connecting portion, the moving distance of the mist can be further reliably shortened. In addition, the porous body should just be located in the connection part for a part by the front end side.
When the mist injection port is connected to a machine tool, the mist injection direction may be along the shaft hole (straight type) or cross the shaft hole. (Elbow type) may be used.

The porous body and the gas supply path through which the gas flow moves are arranged coaxially, and more stable mist generation is achieved by moving the gas flow along the peripheral liquid outflow surface of the porous body. It becomes possible. The porous body and the gas flow path may be positioned on either the inner peripheral side or the outer peripheral side, and the one positioned on the outer peripheral side may be arranged in a cylindrical shape. At this time, by making the cross-sectional area of the gas supply path around the porous body smaller than that on the gas supply side connecting portion side, the gas flow is increased and the mist is generated more smoothly.
Moreover, although air is normally provided as a gas which produces | generates mist, gas, such as nitrogen, oxygen, a carbon dioxide, can be used as needed, and it is not limited to specific gas as this invention.

  For the porous body used in the present invention, foam metal, foam ceramic, sintered filter, resin filter, metal fiber filter, or the like is used. However, the present invention is not limited to the porous material described above, and may be a porous material made of other materials. However, the porous body needs to be able to move the fluid supplied from the fluid supply path for liquid droplets to the liquid outflow surface of the outflow portion, and the movement of the liquid is achieved by having continuity in the porous body.

  In addition, the size and density of the pores formed in the porous body are not limited to specific ones, but the liquid for droplets flows out evenly on the liquid outflow surface to form sufficiently small droplets or liquid film You may decide to do. For example, the hole size may be 0.05 to 0.1 mm in terms of the equivalent circle diameter. When oil flows out from a pore having such a size as a liquid for droplets to form an oil film, it is expected to have a thickness of about 0.01 to 0.05 mm. This thickness is the thickness that is expected to be maintained by blowing the gas stream.

  The flow rate of the gas flow is not particularly limited as the present invention. There is no problem at a flow rate of about 800 to 1200 m / sec. The diaphragm further increases the speed, and for example, the speed can be increased to reach more than 1 to 10 times.

The processing oil droplets blown off from the porous body and mixed in the gas flow are considered to have a diameter of about 0.05 to 0.1 mm at the time of peeling from the pores of the above-mentioned size. In addition, it is expected to have a diameter of about 0.01 to 0.02 mm, which is about 1/5, by receiving a shearing force in a gas flow.
However, the above numerical values are merely examples, and it is needless to say that the present invention is not limited to a specific range.

As described above, according to the joint for semi-dry processing of the present invention, the processing oil supply connection portion to which an external processing oil supply source is connected, the gas supply connection portion to which an external gas supply source is connected, A processing oil supply path communicating with the processing oil supply connection section, a porous body connected to the processing oil supply path and supplied with the processing oil from the supply path, and a gas supply connection section communicating with the gas supply connection section A gas supply path that mixes liquid droplets of processing oil by bringing gas into contact with the surface of the porous body, a mist injection port that communicates with the gas supply path and injects the gas mixed with the droplets to the outside, Since the mist injection port is provided with a connecting portion connected to the machine tool so as to communicate with the shaft hole of the spindle-through machine tool, a mist having fine droplets is immediately generated in the vicinity of the porous body, and the mist The machine tool immediately without having a long path Can be introduced into the shaft hole, the mist efficiently send it to allow a good semi-dry process to loss of mist little processing point.
In addition, by using the joint, it is possible to effectively use a small amount of mist and contribute to improvement of machining accuracy and tool life.

Below, one Embodiment of this invention is described based on FIGS. 1-4.
The joint 100 has a structure in which a cylindrical pressurized oil supply block 10 having a small diameter is coaxially disposed in a hole of the rectangular tube-shaped gas supply block 1, and at the rear end of the gas supply block 1, the gas supply block 1. And the inner peripheral surface of the hole of the pressurized oil supply block 10 are fitted and integrated. In addition, 9 is a ring-shaped sealing material in the figure.

The gas supply block 1 has a gas introduction hole 2 on a side wall, and a gas supply connection portion 3 connected to an external gas supply source (such as factory air) is screwed into the gas introduction hole 2. The A gas supply pipe (not shown) connected to a gas supply source can be connected to the gas supply connection unit 3.
The internal hole of the gas supply block 1 has a large diameter at the portion where the introduction hole 2 is located and communicates with the gas introduction hole 2. Further, the inner peripheral surface of the hole and the outer peripheral surface of the pressurized oil supply block 10 The gas supply path 4 is configured between the two. A hole is opened on the distal end side of the gas supply block 1 in continuation with the gas supply path 4. The hole of the gas supply block 1 has a smaller diameter on the front side of the gas supply path 4, and a small gap is formed between the hole and the outer peripheral surface of the pressurized oil supply block 2. The small gap constitutes the gas supply path 5. The opening hole at the tip of the gas supply block 1 is a mist injection port 6 communicating with the gas supply path 5. Further, the outer periphery on the front end side of the gas supply block 1 is a connecting portion 7 having a small diameter and a screw formed on the outer peripheral surface. Therefore, a mist injection port 6 is formed at the distal end surface of the connecting portion 7.

  On the other hand, the pressurized oil supply block 10 has a processing oil introduction hole 11 at the rear end, and the processing oil introduction hole 11 is connected to an external processing oil supply source (such as an oil storage tank). The oil supply connection 12 is screwed together. A processing oil supply pipe (not shown) connected to a processing oil supply source can be connected to the processing oil supply connection portion 12.

  The processing oil supply block 10 has an internal hole serving as a processing oil supply path 13, and the internal hole penetrates the tip, and a cylindrical porous body 14 is connected to the opening at the tip. The porous body 14 is located on the rear side of the mist injection port 6 and is located in the connecting portion 7. The porous body 14 has substantially the same outer diameter as the outer diameter on the front end side of the processing oil supply block 10, and has a small gap between the porous body 14 and the inner peripheral surface of the gas supply block 1. The small gap constitutes a part of the gas supply path 5.

The joint 1 configured as described above is connected to a spindle-through machine tool. In FIG. 1, reference numeral 210 denotes a rotary joint of the machine tool, and an internal thread portion 211 for connecting the joint 100 to the rotary joint 210 is formed. The female thread portion 211 is provided along the axis of the machine tool, and communicates with the shaft hole 220 of the machine tool.
When the joint 100 is connected to the rotary joint 210 of the machine tool, the mist injection port 6 communicates with the shaft hole 220 and the mist can be moved.

Next, the operation | movement of the mist supply by the said joint is demonstrated.
A gas supply pipe connected to a gas supply source (not shown) is attached to the gas supply connection 3, and a processing oil supply pipe connected to a processing oil supply source (not shown) is attached to the processing oil supply connection 12. The processing oil is pumped and supplied to the air and processing oil supply connection 3.
The processing oil is supplied to the porous body 14 through the processing oil supply pipe 13, and all of the processing oil is impregnated into the porous body 14. The processing oil impregnated in the porous body 14 further reaches the outer surface of the porous body 9, and the oil that has flowed out of the surface pores becomes fine oil droplets or an oil film.

  On the other hand, the air moves through the gas supply path 4 and the gas supply path 5. Since the gas supply path 5 has a smaller gap, the air flow is increased. The air moving through the gas supply path 5 moves from the outer peripheral surface of the porous body 14 along the distal end surface while being in contact with the porous body 14. As a result, the fine oil droplets are effectively peeled from the surface of the porous body 14 one after another, and are entrained in the air to become mist. This mist moves to the tip of the gas supply path 5 and is jetted forward as a mist jet flow from the mist jet port 6. In the mist, fine droplets are stably generated, and thereafter, the mist immediately moves to the rotary joint 210 of the machine tool 200 and is injected into the shaft hole 220. The processing oil injected into the shaft hole 220 moves to the tip side and is supplied from the tip of the machine tool 200 to a processing point (not shown). As a result, good lubricity is provided, and semi-dry machining with a machine tool is performed well.

  The mist ejected as described above produces fine oil droplets stably, is stable without generating coarse oil droplets, and is precisely ejected to a desired processing point. Since diffusion to an unnecessary area is suppressed, the effect of mist injection can be reliably obtained even with a small amount of mist.

In the above embodiment, the mist is injected along the shaft hole (straight type). However, if the mist injection port communicates with the shaft hole, the mist injection direction is limited to the above. It is not done.
FIG. 4 shows a state in which the joint 110 of the present invention is connected to another spindle-through machine tool 230. In addition, the same code | symbol is attached | subjected about the structure similar to the said embodiment.

  The joint 110 has a structure in which a cap-shaped tip block 10b is screwed and integrated with the tip of a cylindrical joint body 10a. A small-diameter cylindrical portion is formed on the distal end side of the joint body 10a, and the distal-end block 10b has an outer cylindrical portion toward the distal end side so as to have a slight gap with the small-diameter cylindrical portion. A threaded portion is formed on the outer peripheral surface of the outer cylindrical portion to constitute the connecting portion 7 of the present invention, and the tip opening of the connecting portion 7 is assigned to the mist injection port 6. A small gap between the small-diameter cylindrical portion of the joint main body 10a and the inner peripheral surface of the outer cylindrical portion of the tip block 10b constitutes the gas ventilation path 4b.

  Further, the joint body 10a is formed with a machining oil supply passage 13b that opens to the small-diameter cylindrical portion at the tip along the axial center, and the machining oil supply passage 13b extends in the radial direction at the center in the front-rear direction of the joint body 10a. It communicates with the processing oil supply path 13a. The processing oil supply path 13a opens to the outer peripheral wall of the joint body 10a, and the processing oil supply connection portion 12 is connected to the opening. Further, a cylindrical porous body 14 is connected to the tip of the processing oil supply passage 13b, and the porous body 14 is formed to have the same outer diameter as the small-diameter cylindrical portion of the joint body 10a. Note that the small gap between the porous body 14 and the cylindrical portion of the tip cap 10b constitutes a part of the gas supply path 4b.

  Further, in the joint body 10a, a gas supply path 4a is formed along the axial direction at a position deviated from the axial center. The gas supply path 4a opens at the tip of the joint body 10a, and Is opened at the rear end of the joint body 10a through a bent portion. The gas supply connection 3 is connected to the opening. A gap is secured between the front end surface of the joint body 10a where the gas supply path 4a opens and the rear end surface of the front end block 10b, and the gap constitutes a part of the gas supply path 4a. Communicated with the gas supply path 4b.

  The machine tool 230 has a rotary joint 240 on the rear end side. In the rotary joint 240, a shaft hole 250 communicating with the tip of the machine tool extends, and a connecting hole 242 extends radially at the rear end. Communicate. The connection hole 242 opens to a female screw-shaped connecting portion 241 provided on the side wall of the rotary joint 240. The joint 110 of the present invention can be connected to the connecting portion 241 through the connecting portion 7 in the same manner as in the above embodiment.

  In this embodiment, the processing oil is supplied to the processing oil supply passages 13 a and 13 b via the processing oil supply connection portion 12 as in the above-described embodiment, and oil droplets or an oil film is formed on the surface of the porous body 14. In addition, air is supplied through the gas supply paths 4 a and 4 b via the gas supply connection 3. As in the above-described embodiment, air entrains minute oil droplets from the porous body 14 and stably generates mist. The mist is injected from a mist injection port 6 provided in the connecting portion 7. The mist passes through the connection hole 242 from the connecting portion 241 of the rotary joint 240 and is introduced into the shaft hole 250 of the machine tool 230. Thereafter, in the same manner as in the above embodiment, the mist is stably supplied to the processing points, and good semi-dry processing becomes possible. In this way, by connecting the mist injection port to the shaft hole of the machine tool, even when the mist injection direction intersects the shaft hole (elbow type), the mist can be satisfactorily supplied to the processing point.

  The present invention has been described based on the above embodiment. The present invention is not limited to the content of the above embodiment, and can be appropriately changed within the scope of the present invention.

It is a partially exploded sectional view showing one embodiment of the present invention. It is sectional drawing which shows the state similarly connected with the machine tool. It is sectional drawing for demonstrating operation | movement similarly. It is sectional drawing which shows the connection state to the machine tool in other embodiment of this invention. It is a figure which shows the conventional mist supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas supply block 2 Gas introduction hole 3 Gas supply connection part 4 Gas supply path 4a Gas supply path 4b Gas supply path 5 Gas supply path 6 Mist injection port 7 Connection part 10 Pressure oil supply block 11 Processing oil introduction hole 12 Processing oil Supply connection portion 13 Processing oil supply passage 13a Processing oil supply passage 13b Processing oil supply passage 14 Porous body 100 Joint 110 Joint 200 Machine tool 210 Rotary joint 211 Connection portion 220 Shaft hole 230 Machine tool 240 Rotary joint 241 Connection portion 242 Connection hole 250 Shaft hole

Claims (4)

  A processing oil supply connection portion to which an external processing oil supply source is connected, a gas supply connection portion to which an external gas supply source is connected, a processing oil supply path communicating with the processing oil supply connection portion, and the processing oil A porous body connected to a supply path to which processing oil is supplied from the supply path, and communicated with the gas supply connection portion, and the supplied gas is brought into contact with the surface of the porous body to form a droplet of the processing oil. A gas supply path for mixing the liquid, a mist injection port for communicating the gas mixed with the liquid droplets to the outside, and the mist injection port communicating with a shaft hole of a spindle-through machine tool And a joint for connecting to the machine tool.   The joint for semi-dry processing according to claim 1, wherein the connecting portion has a convex shape and is connected by fitting into a concave shape provided in a machine tool.   The joint for semi-dry processing according to claim 1 or 2, wherein the porous body and the mist injection port are located in a connecting portion. A processing oil supply path extends toward the mist injection port, and a porous body is provided at the tip thereof. The gas supply path is hung from the rear to the front of the porous body, and the outer periphery of the processing oil supply path The joint for semi-dry machining according to any one of claims 1 to 3, wherein the joint is located coaxially on the side and extends forward to communicate with the mist injection port.

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