KR20090133074A - A cooling circuit of the heating element for indexing device of machine tool - Google Patents

Abstract

PURPOSE: A cooling circuit of a heating element in an indexing device for a machine tool is provided to reduce piping failure and to secure arrangement space from cooling fluid source to each port easily. CONSTITUTION: A cooling circuit of a heating element in an indexing device for a machine tool comprises a fluid supply path(21) with a supply port(21a) for supplying cooling fluid to a cooling path for the uppermost heating element, an intermediate path(23) which connects the discharge side of a cooling path(22) for an upper heating element and the supply side of a cooling path for a lower heating element, and a fluid discharge path(25) with a discharge port(25a) for discharging the cooling fluid provided from a cooling path for the lower most heating element.

Description

Cooling circuit of heating element in indexing apparatus for machine tools {A COOLING CIRCUIT OF THE HEATING ELEMENT FOR INDEXING DEVICE OF MACHINE TOOL}

The present invention is applied to an indexing device for a machine tool having two or more heating elements to be cooled inside, and relates to a circuit for cooling these two or more heating elements.

As an example of the indexing apparatus for machine tools incorporating two or more heating elements, an inclined rotary table apparatus provided with a plurality of drive sources is mentioned. As this inclination-rotating table apparatus, it is known to drive the rotating shaft which rotates an original table, and the inclination axis which inclines the one table with each direct drive type motor (henceforth a "DD motor") (patent document 1). ).

[Patent Document 1] Japanese Unexamined Patent Publication No. 2006-95668

In conjunction with the above-described rotation or tilt driving of the one table, the DD motor generates heat and becomes a high temperature state. Therefore, although it is not described in patent document 1, the cooling circuit (piping for making the fluid for cooling flow) for cooling each DD motor is needed.

As an example of constituting the cooling circuit, in the case of the inner rotor type DD motor, a cylindrical case member (cooling jacket) in which a motor stator is inserted into the inner circumference and a spiral groove is formed on the outer circumference is formed. It is used for a part of an indexing apparatus. Then, the case member into which the motor stator is inserted is inserted into the inner circumferential surface of the circular cross section of the housing member, and a spiral cooling passage is formed by the groove and the inner circumferential surface of the housing member. The DD motor is cooled by flowing a cooling fluid in the spiral cooling flow path.

By using the above-described cooling structure, while supplying the above-described rotating shaft and the inclined shaft to the housing member and supplying and discharging passages through both ends of the spiral cooling passage, the supply passage, The cooling circuit which flows a fluid in order of a spiral cooling flow path and a discharge path is comprised.

By the way, when two DD motors exist as a cooling object when two DD motors exist like the inclination-rotation table apparatus of the above-mentioned patent document 1, as shown in FIG. 5, DD is used for the cooling circuit 90 mentioned above. It is common to provide each motor 91 independently. That is, the supply passage, the discharge passage, the supply port of the supply passage, and the discharge port of the discharge passage are provided in the housing in correspondence with the number of cooling targets.

However, when the cooling circuits are provided in the housing independently of the number of cooling targets, the following problems occur.

First, since the number of supply passages formed inside the housing increases in number, and the combined number of supply passages and discharge passages is twice the number of objects to be cooled, the internal structure of the housing is complicated.

In addition, a supply hose and a discharge hose (or a similar one thereof, hereinafter referred to as "hoses") are connected to the supply port and the discharge port, respectively. Therefore, the hoses twice as many as the object to be cooled are connected to the housing, and the number of hoses increases, so that a pipe miss that leads to a wrong connection can easily occur.

In addition, a large number of hoses must be arranged from the source of the cooling fluid to each port of the inclined rotary table apparatus, making it difficult to secure a sufficient space for arrangement, and cutting caused by machining of the work on the one table. When cleaning a chip or the like, hoses are likely to be disturbed.

In addition, as an example of the use of the inclined rotary table device, it is provided on a moving table in a machine tool such as a machining center, and moves together with the moving table in the X axis direction or the Y axis direction of the machine tool at the time of machining the work. have. In this case, when many hoses are connected to the inclination rotary table apparatus, they may become a load at the time of movement and may cause deterioration of processing accuracy.

Although the cooling object of the above-mentioned problem was a DD motor, it is not limited to this, What is necessary is just a heat generating body which requires cooling. Moreover, although the object of the indexing apparatus was also the inclination rotary table apparatus which has two drive parts, it is not limited to this, The spindle head etc. which have a drive part of A axis | shaft and C axis | shaft may be sufficient (patent document 2), one or three or more. It may have a drive part. That is, regardless of whether the object to be cooled is a drive unit or the number of the drive units, the same problem as described above may occur if the machine tool is an indexing device having two or more heating elements requiring cooling.

[Patent Document 2] US Patent 5584621

The present invention was created in view of the above circumstances, and a problem to be solved is an indexing device for a machine tool including two or more heating elements requiring cooling, which simplifies the structure of the cooling circuit and solves the above problems. It is to solve.

The present invention presupposes an indexing device for a machine tool including a cooling circuit having two or more heating elements requiring cooling in the housing, and a cooling passage provided around each of the heating elements for cooling each of the heating elements.

And the cooling circuit of the heating element in the indexing apparatus for machine tools, The said cooling circuit is a fluid supply path for supplying a cooling fluid to the said cooling flow path for the heating element of the highest rank among each said ranked heating element. A fluid supply path having a supply port formed in the housing, an intermediate flow path connecting the discharge side of the cooling flow path for the upper heating element and the supply side of the cooling flow path for the one lower heating element, and the lower heating element. And a fluid discharge path having a discharge port formed in the housing as a fluid discharge path for discharging the cooling fluid from the cooling flow path.

The method of ranking is not asked. As an example, the ranking is set so that the heat generating element having a larger heat generation amount becomes higher.

In addition, the said indexing apparatus does not ask about the quantity of a drive part, and what the heat generating body which requires cooling. As an example, the indexing device includes two or more drive units, and the heat generator is a direct drive motor provided as a drive source of the drive unit.

In the present invention, the number of the fluid supply path and the fluid discharge path formed in the housing is two regardless of the number of the heating elements, so that the structure of the cooling circuit is simplified even in view of the number of intermediate flow paths. In addition, in the present invention, since there is also one supply port and one discharge port, one pair of hoses for supply and discharge connected to each port is also sufficient, and it is not necessary to install a plurality of tanks as in the prior art. In addition to this, the arrangement space between the supply source of the cooling fluid and the respective ports can be easily secured, and cleaning of the cutting chips or the like generated with the processing can be facilitated. In addition, the present invention can prevent the hoses from becoming a load of movement and lowering the machining accuracy when the indexing device is moved and machined on a machine tool.

In addition, in the case where the ranking is set so as to be higher as the heat generating element having a higher heat generation amount, the heat generating element is cooled sequentially from the heat generating element having a larger heat generation amount, so that each heating element can be efficiently cooled without impairing the cooling performance in the cooling circuit. have.

The indexing device for a machine tool to which the present invention is applied may be provided with two or more heating elements. For example, the indexing device for a machine tool includes a plurality of drive sources such as an inclined rotary table device, a spindle head, or a single rotary table device. The thing provided with the drive source is mentioned. In addition, as a heat generating body here, the drive motor used as a drive source provided in an indexing apparatus, a clamp part, etc. are mentioned, for example. As a drive motor, what uses a reduction mechanism, such as a gear, and the direct drive type motor (DD motor) which does not use such a reduction mechanism is mentioned.

The indexing apparatus for machine tools of FIG. 1 is an inclination rotary table apparatus. The inclination rotation table apparatus is divided into the rotation drive part A which rotates the round table 2, and the inclination drive part B which inclines the round table 2 for every rotation drive part A, when divided | divided into large. Hereinafter, each component is explained in full detail.

The rotation driving unit A supports the one table 2 on which the work is mounted, the rotation shaft 3 supporting the one table 2, and the rotation shaft 3 so as to be rotatable, and to the inclination driving unit B. The housing 1 supported, the rotation drive DD motor 4 accommodated between the housing 1 and the rotating shaft 3, and the clamp device accommodated between the housing 1 and the rotating shaft 3. It consists of (5). When the DD motor 4 for rotation drive is driven, the one table 2 rotates with respect to the housing 1 along with the rotation shaft 3, making the vertical direction axial direction, and the angular position (rotation position). Is calculated. In addition, when the clamp device 5 is operated, the rotating shaft 3 is clamped, so that the angular position of the one table 2 calculated by the rotation is maintained.

The one table 2 puts and hold | maintains a workpiece | work on the upper surface. The original center of the one table 2 is provided in correspondence with the axial direction of the rotation shaft 3 which is arranged downward in the vertical direction from the lower surface of the one table 2. Further, through holes 2h and 3h are formed in the one table 2 and the rotating shaft 3 in the vertical direction, respectively, in the vertical direction.

The rotating shaft 3 is formed by an outer first shaft member 3a having a cylindrical large diameter portion 3a1 and an inner second shaft member 3b having a cylindrical small diameter portion 3b1. It is composed. Then, the large diameter portion 3a1 of the first shaft member 3a and the small diameter portion 3b1 of the second shaft member 3b are spaced apart inward and outward so as to be arranged concentrically. Moreover, the 1st shaft member 3a is provided with the inner blade part 3a2 extended toward the radial direction inward from the upper end part of the large diameter part 3a1. The upper end part of this inner-blade part 3a2 and the 2nd shaft member 3b is uneven | positioned, and the positioned part and the roundtable 2 are screw members screwed in the perpendicular direction in the several place of the circumferential direction. Leads to. By this connection, the rotating shaft 3 is formed in the shape of a double tube opening downward, and the circle table 2 and the rotating shaft 3 are integrally connected.

The housing 1 includes an outer first housing member 1a provided with a cylindrical portion 1a1 surrounding the large diameter portion 3a1 of the rotation shaft 3, the large diameter portion 3a1, and the inside thereof. It consists of the inside 2nd housing member 1b provided with the cylindrical part 1b1 arrange | positioned between the small diameter part 3b1 of the rotating shaft 3 in.

The 1st housing member 1a is provided with the inner edge part 1a2 extended toward the radial direction inward from the upper end part of the cylindrical part 1a1. This inner edge part 1a2 is provided in close contact with the outer periphery surface of the large diameter part 3a1 of the rotating shaft 3 in the inside with an O-ring in between.

The 2nd housing member 1b is equipped with the flange part 1b2 extended toward the radial direction outward from the lower end part of the cylindrical part 1b1. This flange part 1b2 is positioned with respect to the lower end part of the cylindrical part 1a1 of the 1st housing member 1a by the unevenness | corrugation, and the position where the position is screwed in the perpendicular direction in the several place of the circumferential direction Connected to the member. By this connection, the housing 1 is formed in the shape of a double tube which opens upward.

Moreover, in the lower part, the encoder 61 for detecting the rotation amount of the rotating shaft 3 is provided in the cylindrical part 1b1 of the 2nd housing member 1b, and the 1st shaft member 3a of the rotating shaft 3 is provided. ), A detector 62 detected by the encoder 61 is provided. The amount of rotation of the one table 2 is detected based on the detection signal from the encoder 61.

An annular space is formed at another location in the radial direction by fitting between the double tube-shaped housing 1 and the rotation shaft 3 opening in the opposite direction. An accommodating space 71 for a motor is formed between the cylindrical portion 1a1 of the first housing member 1a and the large diameter portion 3a1 of the rotation shaft 3 inside thereof. Moreover, the accommodation space 72 for clamping apparatuses is formed between the large diameter part 3a1 of the rotating shaft 3, and the cylindrical part 1b1 of the 2nd housing member 1b inside it. In addition, an accommodation space 73 for bearing is formed between the cylindrical portion 1b1 of the second housing member 1b and the small diameter portion 3b1 of the rotation shaft 3. By housing the bearing 81 in the accommodation space 73 for bearing, the housing 1 rotatably supports the rotation shaft 3.

The rotation drive DD motor 4 is an inner rotor type in which the stator 4b surrounds the outer circumferential surface of the rotor 4a. The rotation drive DD motor 4 has a stator 4b formed by winding a coil around a fixed iron core, and a rotor 4a in which a plurality of magnets opposed to an inner circumferential surface of the stator 4b are disposed in a circumferential direction. ) And a cooling jacket 4c for holding the stator 4b from the outer circumferential side in a concentric manner.

The rotor 4a is inserted in the outer side of the large diameter part 3a1 of the rotating shaft 3, and is inserted. On the rotor 4a, the upper outer peripheral part of the large diameter part 3a1 of the rotating shaft 3 protrudes in step shape. The upper outer periphery of this large diameter part 3a1 and the rotor 4a are connected so that relative rotation is impossible by the screw member screwed in the perpendicular direction in the several place of the circumferential direction.

The stator 4b is inserted into the cylindrical portion 1a1 of the first housing member 1a with the cooling jacket 4c interposed therebetween, and is disposed outside the rotor 4a.

The cooling jacket 4c is inserted into the outer circumferential surface of the upper end portion and the lower end portion in close contact with the inner circumferential surface of the cylindrical portion 1a1 of the first housing member 1a with the O-ring interposed therebetween. In addition, between the upper end and the lower end provided with the O-ring, a spiral groove (a broad groove in the drawing) is formed on the outer circumferential surface of the cooling jacket 4c for allowing the cooling fluid to pass therethrough. do. By fitting the cylindrical portion 1a1 of the first housing member 1a to the outside of the range where the groove is formed, a spiral cooling passage 22 is formed on the fitting surface.

The clamp device 5 clamps the large diameter part 3a1 of the rotating shaft 3 relatively firmly, and clamps the clamp sleeve 5a and the clamp sleeve 5a which make the rotating shaft 3 relatively non-rotable. It consists of the cylindrical part 1b1 of the 2nd housing member 1b which guides the deforming working fluid (pressure oil, etc.).

The clamp sleeve 5a is disposed concentrically between the cylindrical portion 1b1 of the second housing member 1b and the large diameter portion 3a1 of the outer rotation shaft 3. The lower end part of the clamp sleeve 5a is provided with the flange part 5b which protrudes outward, and the flange part 5b and the flange part 1b2 of the 2nd housing member 1b in the lower part are circumferentially directed. It is connected by the screw member screwed in the perpendicular direction in several places of.

The clamp sleeve 5a has a groove in its inner circumference, and the thin portion 5d that can be deformed is formed between the upper and lower thick portions 5c by the groove. Further, the groove and the cylindrical portion 1b1 of the second housing member 1b therein form a pressure chamber 5e to which a working fluid for deforming the thin portion 5d is supplied. The thin part 5d which forms the outer side of the pressure chamber 5e is arrange | positioned near the large diameter part 3a1 of the outer rotating shaft 3. On the other hand, a fluid passage through the pressure chamber 5e is formed inside the cylindrical portion 1b1 of the second housing member 1b forming the inside of the pressure chamber 5e. By supplying the working fluid to the fluid passage from the outside, the thin portion 5d is deformed in the diameter-expanding direction to tighten the large diameter portion 3a1 of the rotary shaft 3, and as a result, the rotary shaft 3 It remains impossible to rotate.

The inclined drive unit B described below includes a base B3 disposed below the rotary drive unit A, a support unit B2 and a driving unit B1 that are provided to stand on the base B3. It is configured. The support part B2 and the drive part B1 are arrange | positioned so that the rotation drive part A may be interposed, and let the horizontal direction orthogonal to the rotation axis 3 of the rotation drive part A be an axial direction, The one table 2 is supported so as to be inclined for each rotation driving unit A. FIG.

In order to support the round table 2 in a tiltable manner, from the upper end of the cylindrical portion 1a1 of the first housing member 1a in the rotational drive portion A, the shaft fixing portions 1c are disposed on both outer sides of the horizontal direction. Is protruding. In the figure, a horizontal support shaft (not shown) is fixed to the outside on the outer surface of the left shaft fastening part 1c. The support part B2 rotatably supports this support shaft in the upper part. In the figure, a horizontal inclined shaft 8, which will be described later, is fixed to the outer surface of the shaft fixing part 1c on the right side in the coaxial direction with the support shaft.

The drive part B1 is similar to the structure in which the above-mentioned rotary drive part A was laid sideways. The drive part B1 mainly has the housing 6 installed upright on the base B3. The housing 6 includes an inclined shaft 8 rotatably supporting the rotary drive unit A, an inclined drive DD motor 9 for driving the inclined shaft 8, and a cooling unit for the rotary drive unit A. A rotary joint 7 for supplying a fluid and a clamp device 10 for stopping rotation of the inclined shaft 8 are incorporated. Hereinafter, each component is explained in full detail.

The inclined shaft 8 is fixed to the outer surface of the shaft fixing part 1c on the right side of the rotation driving unit A and extends in the horizontal direction. The inclined shaft 8 is constituted by an outer shaft member 8a and a shaft 7b of the inner rotary joint 7. The cylindrical small diameter portion 7b1 provided on the shaft 7b and the cylindrical large diameter portion 8a1 provided on the shaft member 8a are disposed concentrically apart from each other inward and outward. Moreover, the bottom part 8b which blocks the rotation drive part A side of the shaft member 8a, and the bottom part 7c which blocks the rotation drive part A side of this shaft 7b overlap, and the overlapping location is It is connected by the screw member screwed in the horizontal direction in several places of the circumferential direction. By this connection, the inclined shaft 8 is formed in the shape of a double tube which opens to the side outward.

The housing 6 of the drive unit B1 includes an outer third housing member 6a that is installed on the pedestal B3 and an inner fourth housing member that is provided inside the third housing member 6a. It consists of (6b).

The 3rd housing member 6a has the cylindrical part 6a1 surrounding the large diameter part 8a1 of the horizontal inclination shaft 8, and the pedestal integrally formed under the outer periphery surface of the cylindrical part 6a1. It consists of a placing part 6a2 put on B3. In addition, an inner edge portion 6a3 extending inward in the radial direction is connected to the end face of the rotary drive portion A side of the cylindrical portion 6a1 with a screw member which is screwed in the horizontal direction at a plurality of locations in the circumferential direction. do. The inner edge portion 6a3 is provided in close contact with the outer circumferential surface of the large diameter portion 8a1 of the inclined shaft 8 in the inner side with the O-ring interposed therebetween. In addition, on the opposite side of the rotational drive portion of the cylindrical portion 6a1, an inner edge portion 6a4 extending inward in the radial direction is provided continuously.

The fourth housing member 6b is provided with a cylindrical portion 6b1 disposed between the small diameter portion 7b1 of the shaft 7b and the large diameter portion 8a1 of the inclined shaft 8 outside thereof. And a flange portion 6b2 extending radially outward from the opposite side of the rotary drive portion of the cylindrical portion 6b1. The flange part 6b2 is positioned by the unevenness | corrugation with respect to the rotation drive part opposite side of the 3rd housing member 6a, and the position where it is located is connected by the screw member screwed horizontally in the several place of the circumferential direction. . By this connection, the housing 6 of the drive part B1 is formed in the double tube shape which opens to the rotation drive part A side.

By fitting the housing 6 and the inclined shaft 8 of the double-tubular drive part B1 opened in the opposite direction, an annular space is formed at another location in the radial direction. An accommodating space 74 for the motor is formed between the third housing member 6a of the housing 6 and the large diameter portion 8a1 of the inclined shaft 8 therein. Moreover, between the cylindrical part 6a1 of the 4th housing member 6b, and the small diameter part 7b1 of the shaft 7b, the accommodating space 75 for bearings, and the accommodating space 76 for clamping apparatuses Is spaced apart in the horizontal direction. The housing 6 of the drive part B1 supports the inclined shaft 8 rotatably by accommodating the bearing 82 in this bearing accommodation space 75.

The inclined drive DD motor 9 is an inner rotor type similar to the rotation drive DD motor 4, and includes a rotor 9a, a stator 9b surrounding the outer circumferential surface of the rotor 9a, and a stator. The cooling jacket 9c which holds 9b from the outer peripheral side is arrange | positioned at concentric shape.

The rotor 9a is inserted in the outer side of the large diameter part 8a1 of the inclination shaft 8, and is inserted. On the side of the rotation drive part A, the outer peripheral part of the large diameter part 8a1 of the inclination shaft 8 protrudes in the step shape at the side surface of the rotor 9a. The outer circumferential portion of the large diameter portion 8a1 and the rotor 9a are connected to each other in a circumferential direction by a screw member which is screwed in the horizontal direction so as not to be relatively rotatable.

The stator 9b is inserted inside the cylindrical portion 6a1 of the third housing member 6a with the cooling jacket 9c interposed therebetween and is disposed outside the rotor 9a.

The cooling jacket 9c is fitted with the outer circumferential surface on the side of the rotational drive portion A and the side opposite to the rotational drive portion in close contact with the cylindrical portion 6a1 of the third housing member 6a with an O-ring interposed therebetween. Moreover, between the rotation drive part A side in which the O-ring was provided, and the opposite side to the rotation drive part, a spiral groove (a wide groove in the drawing is simply wide) for allowing the cooling fluid to pass therethrough is the cooling jacket 9c. It is formed on the outer circumferential surface of the. When the cylindrical part 6a1 of the 3rd housing member 6a is fitted in the outer side which formed the groove | channel, a spiral flow path is formed as a cooling flow path 24 in a fitting surface.

The clamping device 10 has the same configuration as the clamping device 5 of the rotation driving unit A, except that the tightening direction is inward and the arrangement point is different. In detail, by clamping the small diameter part 7b1 of the rotary joint 7 relatively firmly, the clamp sleeve 10a which makes the rotating shaft 3 relatively non-rotable, and the working fluid which deforms the clamp sleeve 10a are carried out. The clamping device 10 is comprised by the cylindrical part 6a1 of the 4th housing member 6b which guides.

The clamp sleeve 10a is disposed concentrically between the cylindrical portion 6a1 of the fourth housing member 6b and the small diameter portion 7b1 of the inner shaft 7b. A flange portion 10b protruding outward is provided on the opposite side of the rotational drive portion of the clamp sleeve 10a, and the flange portion 10b and the flange portion 6b2 of the adjacent fourth housing member 6b are circumferentially directed. It is connected by the screw member screwed in the horizontal direction in several places of the.

The clamp sleeve 10a has a groove on its outer circumference, and a thin portion 10d that is deformable is formed between the pair of thick portions 10c separated by the groove in the horizontal direction. Further, by the groove and the cylindrical portion 6a1 of the fourth housing member 6b outside thereof, a pressure chamber 10e to which a working fluid for deforming the thin portion 10d is supplied is formed. The thin part 10d which forms the inside of the pressure chamber 10e is arrange | positioned near the small diameter part 7b1 of the shaft 7b arrange | positioned inside it. On the other hand, the fluid passage which communicates with the pressure chamber 10e is formed inside the cylindrical part 6a1 of the 4th housing member 6b which forms the outer side of the pressure chamber 5e. By supplying the working fluid to the fluid passage from the outside, the thin portion 10d is deformed in the direction of reducing the diameter, so that the small diameter portion 7b1 of the shaft 7b is firmly tightened, and as a result, the inclined shaft 8 Is kept non-rotatable.

In addition, on the opposite side of the rotation driving unit, an encoder 63 for detecting the amount of rotation of the inclined shaft 8 is provided in the clamp sleeve 10a, and the encoder 63 in the small diameter portion 7b1 of the shaft 7b. The detectable person 64 detected in is provided. The amount of rotation of the inclined shaft 8 is detected based on the detection signal from the encoder 63.

The rotary joint 7 consists of the shaft 7b mentioned above and the distributor 7a, and is formed in the cylindrical shape of the distributor 7a in the inner circumferential surface of the cylindrical small diameter part 7b1 of the shaft 7b. The rod part 7a1 is inserted and inserted.

The distributor 7a is provided on the opposite side of the rotational drive portion of the rod portion 7a1 so as to protrude the flange portion 7a2 outward in the radial direction. The outer circumferential portion of the flange portion 7a2 and the flange portion 6b2 of the fourth housing member 6b overlap each other on the opposite side of the rotation driving portion. The overlapping points are positioned by unevenness and are connected by a screw member which is screwed in the horizontal direction at a plurality of locations in the circumferential direction. In this manner, the flange portion 7a2 of the distributor 7a is connected to the opposite side of the rotational drive portion of the fourth housing member 6b and constitutes an outer portion like the housing 6, and thus is a part of the housing 6.

In addition, as shown in FIG. 2, using two flow paths provided in the rotary joint 7, a fluid supply path 21 for supplying a cooling fluid to the cooling flow path 22 of the rotary drive unit A and The intermediate flow passage 23 is formed to relay the cooling fluid discharged from the cooling flow passage 22 of the rotary drive unit A to the cooling flow passage 24 of the inclined drive unit B.

The fluid supply passage 21 connects the supply side of the cooling passage 22 in the outer peripheral portion of the rotational drive DD motor 4 from the supply port 21a formed in the distributor 7a of the rotary joint 7. By making it pass, the supply port 21a is also included. In addition, the fluid supply passage 21 is formed over the rotary joint 7, the inclined shaft 8, and the housing 1 of the rotation driving unit A, and thus the cooling passage 22 of the rotation driving unit A. It is a flow path through the supply side. On the other hand, the part between the rod part 7a1 and the shaft 7b of the distributor 7a in the rotary joint 7 in the fluid supply path 21 fits between the rod part 7a1 and the shaft 7b. It is comprised by the ring-shaped groove 21b continuous in the circumferential direction formed in the fitting surface, and the state through which the rod part 7a1 and the shaft 7b rotate relative is maintained by both.

On the other hand, the intermediate flow path 23 is the cooling flow path in the discharge side of the cooling flow path 22 in the outer peripheral part of the rotation drive DD motor 4, and in the outer peripheral part of the gradient drive DD motor 9. The supply side of (24) is connected in series. In addition, the intermediate flow path 23 includes the housing 1 of the rotary drive unit A, the inclined shaft 8, the rotary joint 7, and the housing 6 of the drive unit B1 in the inclined drive unit B. It is formed over the flow path, and is a flow path to the supply side of the cooling flow path 24 of the inclined drive section (B).

On the other hand, the part between the rod part 7a1 and the shaft 7b of the distributor 7a in the rotary joint 7 in the intermediate | middle flow path 23 is horizontal to the said annular groove 21b. It is comprised by the other annular groove 23a formed in the fitting surface of the rod part 7a1 and the shaft 7b by shifting a position, and even if the rod part 7a1 and the shaft 7b rotate relative, The state is to be maintained.

The fluid discharge path 25 is formed on the discharge side of the cooling passage 24 on the inclined drive portion B side. The fluid discharge path 25 has a discharge port 25a formed in the discharge side of the cooling passage 24 on the inclined drive unit B side and the housing 6 of the drive unit B1 in the inclined drive unit B. It is connected continuously and includes the discharge port 25a. In addition, although each flow path mentioned above is formed through the hole provided in the corresponding site | interval, it is formed, but it may be possible to form using hoses.

As described above, the fluid supply path 21 including the supply port 21a formed in the housing 6 in the drive unit B1 of the inclined drive unit B, the cooling flow path 22 of the rotary drive unit A, Fluid discharge path 25 including an intermediate flow path 23, a cooling flow path 24 of the inclined drive part B, and a discharge port 25a formed in the housing 6 in the drive part B1 of the inclined drive part B. By passing through in order, the cooling circuit 20 of the heating element in the indexing apparatus for machine tools is comprised. The supply hose from the fluid supply source is connected to the supply port 21a, and the discharge hose from the fluid supply source is connected to the discharge port 25a. Then, the cooling fluid flows from the fluid supply source to the cooling circuit 20 and is recovered to the fluid supply source.

Each cooling flow path 22 and 24 constituting a part of the cooling circuit 20 is provided around the rotational drive DD motor 4 and the gradient drive DD motor 9. In other words, each of the DD motors 4 and 9 is a heating element that requires cooling.

In addition, the cooling order of the two heat generating elements mentioned above makes the rotation drive DD motor 4 higher and the inclination drive DD motor 9 lower from a viewpoint which gives priority to heat generation amount. That is, first, a cooling fluid flows into the cooling flow path 22 provided around the rotation drive DD motor 4 so as to cool the large heat generation amount, and thereafter, to cool the gradient drive DD motor 9. For cooling, the cooling fluid is supplied to the cooling passage 24 provided around the same. In this way, by employing a configuration in which the heating element having a larger heat generation amount is first cooled, in cooling a plurality of heating elements with a single cooling circuit 20, the cooling performance for each heating element is not impaired. The cooling of the heating element can be performed efficiently.

In the above-mentioned example, the structure which cools two heat generating bodies with the single cooling circuit 20 is explained about the cooling circuit by this invention targeting the indexing apparatus for machine tools in the case of two heat generating objects which are cooling objects. However, the cooling circuit according to the present invention can also be applied to an indexing device for a machine tool when there are three or more heating elements to be cooled.

In the example of FIG. 3, the cooling circuit 30 of this invention is applied to the inclination-turning table apparatus which has three heat generating objects to be cooled, ie, the inclination drive part B has the drive part B1 on both sides of the rotation drive part A. FIG. It is applied.

One of these inclined drive parts B, the right side drive part B1 is formed similarly to the precedent drive part B1. In addition, the other side of the inclination drive part B and the drive part B1 on the left side are used instead of the precedent support part B2, and the housing (B1) similarly to the drive part B1 of the inclination drive part B of the precedent case, 6) The rotary joint 7, the inclination shaft 8, the DD motor 9 for inclination drive, and the clamp device 10 are components. For this reason, the drive table B1 of both sides of the inclination drive part B synchronizes and rotates each inclination shaft 8, and the original table 2 of the rotation drive part A inclines.

As for the drive part B1 of the inclination drive part B, compared with the rotation drive part A, the rotation drive part A itself containing the housing | casing 1, the rotation drive DD motor 4, etc. is made into the inclination shaft 8; Since it drives in rotation, the load required for driving is large. For this reason, the structure which provided the drive part B1 of the inclination drive part B on both sides may be used as an apparatus for processing a heavy load and a workpiece with a heavy weight.

In the example of FIG. 3, the fluid supply path 31 including the supply port 31a formed in the housing 6 of the drive part B1 of the right side in the inclination drive part B, and the cooling flow path of the rotation drive part A ( 32) Cooling flow path 34 formed in the drive part B1 on the left side in the 1st intermediate flow path 53 and the inclination drive part B, Cooling formed in the 2nd intermediate flow path 35 and the drive part B1 on the right side. The single cooling circuit 30 is constituted by successive passages in the order of the fluid discharge path 37 including the flow path 36 and the discharge port 37a formed in the housing 6 of the drive unit B1 on the right side. do.

The cooling circuit 32 of the fluid supply path 31 and the rotation drive part A is the same structure as the cooling flow path 22 of the precedent fluid supply path 21 and the rotation drive part A. FIG.

The first intermediate flow passage 33 allows the discharge side of the cooling flow passage 32 of the rotary drive unit A to communicate with the supply side of the cooling flow passage 34 of the drive unit B1 on the left side. In addition, the 1st intermediate | middle flow path 33 is the left side in the housing 1 of the rotary drive part A, the left inclination shaft 8, the left rotary joint 7, and the left drive part B1. It is formed over the housing 6.

The cooling flow path 34 of the drive part B1 on the left side has the same structure as the cooling flow path 24 of the precedent drive part B1.

The second intermediate flow passage 35 allows the discharge side of the cooling flow passage 34 of the left drive portion B1 to communicate with the supply side of the cooling flow passage 36 of the right drive portion B1. In addition, the second intermediate flow path 35 includes the housing 6 of the drive unit B1 on the left side, the rotary joint 7 on the left side, the inclined shaft 8 on the left side, the housing 1 of the rotation driving unit A, It is formed over the inclined shaft 8 of the right side, the rotary joint 7 of the right side, and the housing 6 of the drive part B1 of the right side.

The fluid discharge path 37 has the same structure as the precedent fluid discharge path 25.

Each cooling flow path 32, 34, 36 contained in a part of the above-mentioned cooling circuit 30 is rotation drive DD motor 4, and inclination drive DD motor 9 in the drive part B1 on the left side. And the inclination drive DD motor 9 in the drive part B1 on the right side. These three DD motors 4, 9 and 9 are heating elements requiring cooling.

The order of cooling the heating element is in order of the rotation drive DD motor 4, the left tilt drive DD motor 9 and the right tilt drive DD motor 9. This ranking is a result of ranking in the order of large amount of heat generation. The DD motor 4 for rotation drive has the largest heat generation amount. On the other hand, the remaining two inclination drive DD motors 9 and 9 have the same heat generation amount. In such a case, the ranking may be arbitrarily considered in consideration of the configuration of the cooling circuit 30.

In other words, in the present invention, in the case of ranking according to the calorific value of each of the heating elements, in the example of the illustration, the order of the calorific values is set in a large order. However, when a heating element emitting an equivalent calorific value is included, it is sufficient to set them arbitrarily.

4 is a separate example of an indexing apparatus for a machine tool to which the present invention is applied, and is referred to as a horizontal direction (hereinafter, referred to as 'A axis direction') and a vertical direction (hereinafter, referred to as 'C axis direction') of the machine tool. The spindle head 40 drives the spindle device 41 to rotate.

The spindle head 40 supports the spindle apparatus 41 to which a tool is attached, the 1st support head 42 which rotatably supports the spindle apparatus 41, and the 1st support head 42 rotatably. It includes a second support head 43 to.

The 1st support head 42 is a fork-shaped housing 42a which consists of the base part 42a2 which connects the pair of leg parts 42a1 and the pair of leg parts 42a1 which are separated apart in the A-axis direction. It consists mainly of And the spindle apparatus 41 is arrange | positioned between a pair of leg part 42a1, The pair of support shaft 41a which protrudes in the A-axis direction from both sides of the spindle apparatus 41 is a pair of leg part ( 42a1) is rotatably supported about A axis. Furthermore, the 1st support head 42 has the DD motor 44 built in each leg part 42a1, and the spindle apparatus by rotating-driving the corresponding support shaft 41a by each DD motor 44 is carried out. (41) is rotated about an A axis, and the angular position is computed.

The second support head 43 is a housing for rotatably supporting a support shaft 42a3 protruding from the base portion 42a2 of the first support head 42 on the opposite side to the spindle device 41 ( 43a). The second support head 43 incorporates a DD motor 45 in the housing 43a. The second support head 43 rotates the first support head 42 around the C axis with the DD motor 45, and the angle thereof. To calculate the location.

In this case, the fluid supply path 51 including the supply port 51a formed in the housing 43a of the second support head 43 and the DD motor 45 in the second support head 43 are provided. Cooling flow path 52, 1st intermediate flow path 53, Cooling flow path 54 provided in the circumference | surroundings of DD motor 44 in the leg part 42a1 of the left side, 2nd intermediate flow path 55, the right leg. A fluid discharge path 57 including a cooling flow path 56 provided around the DD motor 44 in the part 42a1, and a discharge port 57a formed in the housing 43a of the second support head 43; By connecting in order, the cooling circuit 50 of the cooling fluid is comprised. That is, here again, each of the DD motors 44 and 45 is a heating element to be cooled.

The 1st intermediate flow path 53 connects the discharge side of the cooling flow path 52 in the 2nd support head 43, and the supply side of the cooling flow path 54 in the leg part 42a1 of the left side.

The second intermediate flow passage 55 connects the discharge side of the cooling passage 54 in the left leg portion 42a1 with the supply side of the cooling passage 56 in the right leg portion 42a1.

This invention is not limited to the said embodiment. The heating element to be cooled was a DD motor in the above description, but is not limited to this, and may be a clamp device, a worm gear, or the like as described above. Thus, the heat generating body to be cooled includes a drive source and a transmission mechanism thereof. Therefore, the indexing apparatus for machine tools to which this invention is applied may not have two or more drive parts.

For example, in a rotary table apparatus or the like, the clamp member (clamp disk or the like) and the worm gear (worm wheel) are in a state of being immersed in lubricating oil in a space formed in the housing. The lubricating oil not only lubricates the clamp member and the worm gear, but also has a cooling action. Therefore, the lubricating oil is supplied and discharged through the flow path for supplying and discharging the lubricating oil to the space (oil chamber (oil tank, oil bus)) in the housing in which the lubricating oil is collected. A part may be included) as the cooling flow path described in the present invention. That is, the cooling flow path is not limited to being formed in the tubular shape with the same diameter, and may include a space in the housing in which the cooling fluid is collected.

In addition, in the present invention, when ranking according to the amount of heat generated by each of the heat generating elements, it is also possible to set the amount of heat generated in a small order, unlike the example shown in the figure. On the other hand, the ranking may be arbitrarily set in consideration of the ease of configuration of the cooling circuit irrespective of the amount of heat generated by each heating element.

In the cooling circuit of the heating element of the present invention described above, when the number of heating elements to be cooled is an integer n of 2 or more, the fluid supply path, the cooling flow path, (n-1) x (intermediate flow path, cooling flow path), the fluid discharge path It consists of the order of.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the inclination rotary table apparatus applied to this invention.

2 is a front view showing a cooling circuit built in an inclined rotary table device.

3 is a front view showing a cooling circuit constructed in another inclined rotary table device.

4 is a front view showing a cooling circuit built in a spindle head.

5 is a front view showing a conventional cooling circuit.

<Description of the symbols for the main parts of the drawings>

A: rotating drive part

1: housing

1a: first housing member

1a1: Cylindrical part

1a2: inner bottom

1c: High School Government

1b: second housing member

1b1: Cylindrical part

1b2: Flange

2: one table

2h: through hole

3: axis of rotation

3a: first shaft member

3a1: large diameter part

3a2: inner edge

3h: through hole

3b: second shaft member

3b1: small diameter part

4: DD motor for rotation drive

4a: rotor

4b: Stator

4c: cooling jacket

5: clamp device

5a: clamp sleeve

5b: Flange

5c: thick part

5d: thin part

5e: pressure chamber

B: inclined driving part

B1: drive part

B2: support

B3: pedestal

6: housing

6a: third housing member

6a1: Cylindrical part

6a2: Placement part

6a3: inner edge

6a4: inner edge

6b: fourth housing member

6b1: Cylindrical part

6b2: Flange

7: rotary joint

7a: Distributor

7a1: rod part

7a2: Flange

7b: shaft

7b1: small diameter part

7c: bottom part

8: tilt axis

8a: shaft member

8a1: large diameter part

8b: bottom

9: DD motor for tilt drive

9a: rotor

9b: Stator

9c: cooling jacket,

10: clamp device

10a: clamp sleeve

10b: flange

10c: thick part

10d: thin part

10e: pressure chamber

20: cooling circuit

21: fluid supply passage

21a: supply port

21b: annular groove

22: cooling flow path

23: middle euro

23a: annular groove

24: cooling flow path

25: fluid discharge furnace

25a: discharge port

30: cooling circuit

31: fluid supply passage

31a: supply port

32: cooling flow path

33: the first intermediate euro

34: cooling flow path

35: second intermediate euro

36 cooling channel

37: fluid discharge furnace

37a: discharge port

40: spindle head

41: spindle unit

41a: support shaft

42: first support head

42a: housing

42a1: leg

42a2: Foundation

42a3: support shaft

43: second support head

43a: housing

44: DD motor

45: DD motor

50: cooling circuit

51: fluid supply passage

51a: supply port

52: cooling flow path

53: first intermediate euro

54: cooling flow path

55: second intermediate euro

56: cooling flow path

57: fluid discharge path

57a: discharge port

61: encoder

62: detectee

63: encoder

64: the subject,

71: accommodating space for the motor

72: accommodation space for the clamp device

73: receiving space for bearings

74: accommodating space for the motor

75: receiving space for bearing

76: receiving space for the clamp device

81: bearing

82: bearing

Claims (3)

An indexing apparatus for a machine tool comprising a cooling circuit having two or more heating elements requiring cooling in a housing, and a cooling passage provided around each of the heating elements to cool each of the heating elements. The cooling circuit includes a fluid supply path having a supply port formed in the housing as a fluid supply path for supplying a cooling fluid to the cooling flow path for the heating element at the top of each of the ranked heating elements, and the upper heating element. An intermediate flow path connecting the discharge side of the cooling flow path to the supply side of the cooling flow path for one lower heating element, and a fluid discharge path for discharging the cooling fluid from the cooling flow path for the lowest heating element. And a fluid discharge path having a discharge port formed in the housing. The cooling circuit of the heat generating element according to claim 1, wherein the ranking is set so as to be higher as the heat generating element having a larger heat generation amount. 3. The heating element according to claim 1 or 2, wherein the indexing device includes two or more driving parts, and the heating element is a direct drive type motor provided as a driving source of the driving part. Cooling circuit.

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