JP2589836Y2 - Pallet feeding structure for machine tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet power supply structure for externally supplying electric power to a pallet exchangeably mounted on a processing table in a machine tool such as a machining center.

[0002]

2. Description of the Related Art A machine tool such as a machining center is often provided with a pallet changing device so that pallets can be changed between a machining table of the machining center and the pallet changing device. Various jig devices for holding the work are mounted and fixed on the pallet. The jig device includes, for example, an automatic indexing table for performing complex machining, an automatic clamp table using a working medium, and the like, and these are provided with an electric actuator such as an electric motor or a solenoid valve for performing automatic control. . Therefore, in this type of machine tool, it is necessary to supply power to the jig device while allowing the pallet to be exchanged between the processing table and the pallet changing device.

Conventionally, as a method of supplying power to a jig device on a pallet while allowing the pallet to be exchanged, a method of exchanging a pallet with wiring connected (Japanese Patent Laid-Open No. 63-24 / 1988)
5339, JP-A-3-60947),
Alternatively, it is known that the wiring is freely connectable and separable, and is separated at the time of replacement and connected on a processing table (for example, see Japanese Patent Application Laid-Open No. 2-274451).

Japanese Patent Application Laid-Open No. 63-245339 discloses a pallet changer in which a pallet placed on a working table and a pallet changer are exchanged by using a space above the machine. Is fixed to the jig device so as to be rotatable and the other end is rotatably fixed to the pallet changing device turning shaft. I have.

The pallet changing device described in Japanese Patent Application Laid-Open No. 3-60947 is a pallet changing device for changing a pallet between a machining position and a setup position by a turning operation. Is supplied to the jig device on the pallet at each position from the rotary contact.

In the above-mentioned Japanese Unexamined Patent Publication No. 2-274451, a power-receiving-side connector is fixed to a pallet, a power-supply-side connector is movably supported on a fixed support portion of a processing table, and the pallet is loaded onto the processing table. The connector is connected only when power is supplied.

[0007]

However, when the above-mentioned rotary contact or connector is used, there is a problem that the contact life is limited. In addition, when power is supplied to the jig device on the pallet by a flexible electric wire using the space above the machine, the moving range of the pallet is limited by the length of the electric wire. It is difficult to operate with the wiring connected because the wiring is complicated. In particular, it cannot be adopted in a machining center having a three-dimensional pallet storage device for storing pallets three-dimensionally. Further, the flexible electric wire is apt to be bent due to frequent movement of the pallet between the processing table and the pallet changing device, so that disconnection easily occurs and there is a problem in reliability.

In the connector system, there is no problem in the case of a structure in which the working table and the pallet move together.
It cannot be applied to horizontal machining centers that rotate and index pallets on a processing table. Further, a special drive mechanism for attaching and detaching the connector is required, and there is a problem that it takes time to change the pallet.

Here, in order to solve the above-mentioned problems, it is conceivable to employ a contactless power supply device for supplying power without contact as disclosed in Japanese Patent Application Laid-Open No. 4-345008. This non-contact power supply device arranges and positions a power supply member and a power receiving member so as to face each other via a predetermined gap at the time of power supply, and supplies power in a non-contact manner by magnetic coupling of both members. .

However, in order to adopt a non-contact power supply device, it is necessary to precisely control the power supply member and the power receiving member so as to oppose each other with a predetermined gap, and to maintain the opposing relationship. Therefore, there is a concern that sufficient reliability cannot be obtained depending on the arrangement / positioning structure of these members, and that a separate new mechanism is required for positioning.

The present invention has been made in view of the above-mentioned conventional circumstances, and when a non-contact power supply device is employed, a power supply member and a power reception member can be accurately opposed to each other and their positional relationship can be maintained. An object of the present invention is to provide a pallet power supply structure for a machine tool in which it is not necessary to separately provide a positioning mechanism for a member and a power receiving member, so that the positioning structure for both members does not become complicated.

[0012]

According to a first aspect of the present invention, there is provided a machine tool for externally supplying power to a pallet mounted and fixed so as to be exchangeable on a processing table and to maintain a predetermined positional relationship. In the pallet power supply structure, the power supply member of the non-contact power supply device is disposed and fixed at the pallet-facing portion of the processing table, and the power receiving member faces the power supply member with a predetermined gap when the pallet is placed and fixed on the processing table. The pallet is fixed to a portion of the pallet facing the machining table.

According to a second aspect of the present invention, in the first aspect, the facing surface facing the upper side of the power supply member has a male taper shape.
An opposing surface of the power receiving member facing downward is formed in a female tapered shape.

[0014]

According to the pallet power supply structure for a machine tool according to the first aspect of the present invention, the power supply member fixed to the pallet-facing portion of the working table and the power receiving member fixed to the pallet table-facing portion face each other when the pallet is mounted. Since power is supplied from the table side to the pallet side in a non-contact manner, problems when using a link type arm, a rotating contact, a connector, and the like, for example, a reduction in contact life, a limitation on a moving range and a limit on the number of pallets can be solved. In addition, since the pallet can be arbitrarily turned while the power is supplied, complex machining can be performed.

In order to arrange and position the power supply member and the power receiving member at predetermined positions and maintain the positional relationship, the positioning clamp mechanism between the working table and the pallet is used as it is, so that the pallet is placed on the working table. When the power supply member and the power receiving member are automatically clamped, the power feeding member and the power receiving member are automatically aligned and opposed to each other, and the positional relationship is maintained. Therefore, a separate mechanism for positioning the power feeding and power receiving members is not required.

According to the pallet power supply structure according to the second aspect of the present invention, the opposing surface of the lower power supply member is formed in a male taper shape, so that chips are deposited on the opposing surface and cutting oil is formed. Does not accumulate, the power supply and power receiving members are not damaged, reliability is improved, and work efficiency is improved because the operator does not need to clean the pallet every time the pallet is replaced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views for explaining a pallet feeding structure of a machine tool according to an embodiment (first embodiment) of the invention according to claims 1 and 2, and FIG. 1 is an overall layout view of the machine tool.
FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 2 shows a state where the pallet is clamped.

In FIG. 1, reference numeral 62 denotes a vertical machining center having the structure of the present embodiment, which is a spindle device 60 having a cutting tool at the lower end thereof, which is movable in the left-right direction of FIG. A processing table 1 is provided. Further, a pallet changing device 63 for changing the pallet 2 on the processing table 1 with the pallet 2 on standby is provided on the side of the machining center 62. Also 8
Is a jig device fixed on the pallet 2, and the jig device 8 performs automatic indexing for gripping a workpiece and performing compound machining.

The processing table 1 has a processing table main body 3 for positioning and mounting the pallet 2 transferred from the pallet changing device 63 and performing arbitrary turning indexing, and a positioning and mounting on the processing table main body 3. A clamping device 4 for fixing the pallet 2 to the processing table main body 3 and a power supply device 5 for supplying electric power from the processing table side to the pallet side in a non-contact manner by positioning and fixing the pallet 2 on the processing table 1 are provided. ing. Here, the pallet changing device 63 has two stations. One station is empty and the processing table 1
The upper pallet 2 is transferred to this empty station.

The machining table main body 3 is rotatably supported by two bearings 6, 6 arranged at an interval in the axial direction, and has a rotating shaft 31 having a through hole in the axial center thereof; A worm wheel 32 is fixed to the outer periphery of a middle portion of the rotating shaft 31 in the height direction, and a disk-shaped table 33 is fixed to the upper end of the rotating shaft in a flange shape. The machining table body 3 arbitrarily positions the table 33, which rotates integrally with the rotating shaft 31, at a predetermined angle by rotating the worm shaft 7 meshed with the worm wheel 32 by a servo motor (not shown). Also,
A concave cylinder bore portion 34 is formed over the entire circumference at the inner diameter of the lower end of the rotating shaft. Further, four positioning members 35, 35 having a tapered tip at the upper end surface of the table.
Are fixed at equal angular intervals on the circumference.

An operating shaft 41 having a through hole in an axis center which is slidably inserted in the rotating shaft in the axial direction and is non-rotatably supported by a key member 46;
A piston portion 42 is formed integrally on the outer periphery of the lower end of the operating shaft so as to be convex over the entire circumference, and a substantially rectangular clamp plate 43 is fixed to the upper end of the operating shaft in a flange shape. . The piston portion 42 of the operating shaft 1 is fitted to the inner diameter of the cylinder bore portion 34 of the rotary shaft 31 in a liquid-tight and slidable manner to form a cylinder. The cylinder is separated into an upper gap portion 44 and a lower gap portion 45 by a piston portion 42, and the oil is injected into one of the gap portions via a pipeline by a hydraulic pump (not shown) to thereby form the cylinder via the operating shaft 41. The clamp plate 43 fixed to the upper end is driven in the axial direction with respect to the rotating shaft 31.

Here, the pallet 2 transferred onto the processing table 1 is a rectangular parallelepiped having a substantially square shape in a plan view, and a concave portion 21 is formed on the lower end surface over the entire width. Are formed with engagement grooves 22 with which the clamp plate 43 engages. Further, tapered holes 23, 23 which fit into the tapered surface of the positioning member 35 are formed in the lower end surface of the pallet 1.

The power supply device 5 includes the processing table 1
And the pallet 2 are disposed between the facing surfaces. The power supply device 5 includes a pair of power supply-side cores (power supply members) 51 having a large number of windings and a power reception-side core (power reception member) 52 disposed opposite to each other with a predetermined gap therebetween. This is a so-called non-contact type in which electric power is supplied from a power supply side to a power receiving side in a non-contact manner by electrical coupling. In the present embodiment, both the power-supplying core 51 and the power-receiving-side core 52 have a short columnar shape, and a convex conical male tapered surface 51 a is formed on the facing surface facing above the power-supplying core 51. A concave conical female taper surface 52a is formed on the opposing surface of the power receiving side core 52 facing downward.

The power supply core 51 is coaxially inserted into the through hole of the operating shaft 41 and is fixed to the upper end of a fixed shaft 56 erected on a fixed support portion 55. In addition,
The fixed support portion 55 is provided in the processing table 1 and moves together with the processing table 1. One end of a lead wire 53 is connected to the winding of the power supply side core 51, and the other end of the lead wire 53 is connected to a power supply device (not shown) through a through hole 57 of the fixed shaft 56. ing.

The power receiving core 52 is disposed and fixed on the lower surface of the pallet 2 coaxially with the turning axis. When the pallet 2 is clamped to the working table 1 by the clamping device 4, the power receiving core 52 is fixed. Are spaced apart from each other so as to be coaxial. One end of a lead wire 54 is connected to the winding of the power receiving side core 52, and the other end of the lead wire 54 is connected to the electric actuator of the jig device 8.

Next, the operation and effect of this embodiment will be described. When the pallet 2 of the next process is placed and fixed on the processing table 1, before the pallet 2 is transferred from the pallet changing device 63 onto the processing table 1, the processing table main body 3 has to be fitted with the concave engaging grooves 22 on the lower surface of the pallet in advance. And the clamp plate 43 coincide with each other, and the positioning member 35 and the tapered hole 23 are pivotally positioned so as to coincide with each other. Then, by injecting oil into the cylinder lower gap portion 45, the clamp plate 43 is lifted with respect to the processing table body 3 to be unclamped and positioned at the position. Next, the pallet 2 is slid from the pallet changing device 63 in a direction perpendicular to the table rotation axis. In this case, the pallet 2 moves on the processing table 1 while being guided by the clamp plate 43, and is positioned at a position where the positioning member 35 on the upper surface of the table and the tapered surface 23 on the lower surface of the pallet substantially match. At this time, the pallet 2 moves at a height such that the positioning member 35 does not interfere with the lower surface.

Next, by injecting oil into the cylinder upper space 44, the pallet 2 is lowered together with the clamp plate 43, and the tapered holes 23 on the lower surface of the pallet are fitted to the tapered surfaces of the positioning members 35 on the upper surface of the table. . Then, the center axis of the pallet 2 and the turning axis of the processing table 1 coincide with each other and are accurately positioned, and the clamp plate 43 presses the pallet 2 against the table 33 and fixes the pallet 2 on the processing table 1.

The feeder core 5 fixed to the processing table 1 by transferring, positioning, and clamping the pallet 2
1 and the power-receiving-side core 52 fixed to the pallet 2 are automatically positioned so as to face each other with a predetermined gap and coaxially. When the control device (not shown) determines that the pallet 2 is clamped, power is supplied to the power supply core 51 via the lead wire 53, the opposing power receiving core 52 is insulated, and the electric power due to the dielectric is supplied to the lead wire. It is supplied to the jig device 8 on the pallet via 54.

In the above embodiment, the case where the power supply side core and the power reception side core of the power supply device are cylindrical having tapered surfaces has been described. However, these cores may have any shape as long as they can supply power. Good. For example, the power-supplying-side core and the power-receiving-side core may each be formed in a disk shape.

FIG. 3 is a view for explaining a second embodiment of the present invention, showing a pallet clamping state. In the drawing, the same reference numerals as those in FIG. 2 indicate the same or corresponding parts. Hereinafter, only portions different from the first embodiment will be described.

The power supply device according to the present embodiment includes a first power supply device 5 'disposed at a portion facing a table and a pallet, and a second power supply device 64 disposed at a lower end of the table. The first power supply side core 51 ′ of the first power supply device 5 ′ is coaxially disposed and fixed to the upper end inside the operating shaft via a fixing member 71. When the pallet 2 is clamped to the processing table 1, the first power-supplying-side core 51 'faces the first power-receiving-side core 52' fixed to the lower portion of the pallet with a predetermined gap, and always has the same phase even when the processing table is turned. Rotate with. The first power supply device is a lead wire 53 and the second power supply device 6.
4, and an external power supply (not shown) via a lead wire 50.

The second power supply side core 5 of the second power supply device 64
8 is fixed to the upper end of a fixed shaft 56 erected on a fixed support portion 55 which is arranged near the lower end of the operating shaft and moves together with the processing table, and is connected to a power supply device via a lead wire 50. ing. Further, the second power receiving side core 59 is fixed to the vicinity of the lower end portion inside the operating shaft via a fixing member 72, and is coaxial with the second power feeding side core 58 with a predetermined gap when the pallet 2 is clamped to the processing table 1. They are opposed to each other.

In the second embodiment, when the pallet 2 is clamped on the processing table 1, the cores 51 'and 52' on the power supply side and the power receiving side of the first power supply device 5 'are automatically opened with a predetermined gap. The power supply side and the power receiving side cores 58 and 59 of the second power supply device 64 are coaxially opposed with a predetermined gap. Then, when power is supplied from the power supply device to the second power supply side core 58 via the lead wire 50,
The power is fed from the power-supplying core 58 to the second power-receiving-side core 59, and the inductive power is supplied to the first power-supplying-side core 51 ′ via the lead wire 53. Power is distributed to the electric actuator and the like of the jig device 8 via the lead wire 52 '.

In the second embodiment, the same effects as in the first embodiment can be obtained. In the second embodiment, since the first power supply core 51 'is fixed near the upper end of the operating shaft 41, the power supply core 51 is fixed via the long fixed shaft 56 as in the first embodiment. Compared with the case where the actuator shaft is fixed to 55, the displacement of the air gap when the operating shaft 41 is thermally displaced can be minimized, and the reliability can be further improved.

In each of the above embodiments, before the pallet is clamped to the processing table, air blowing is performed toward the power supply side core and the power receiving side core by an air blow device provided on the processing table side, so that these cores and the like are blown. It is more preferable to remove the attached chips and cutting oil.

The application of the present invention is, of course, not limited to the machining table having the above configuration. For example,
The present invention is also applicable to a machine tool having a machining table that does not perform turning indexing as disclosed in Japanese Patent Application Laid-Open No. 2-274451.

[0037]

According to the pallet power supply structure for a machine tool according to the first aspect of the present invention, the power supply member on the processing table side and the power receiving member on the pallet side face each other when the pallet is mounted, and the pallet side from the table side without contact. Power supply, the effect of reducing the contact life can be avoided, the power can be supplied without being restricted by the moving range and the number of pallets, etc. There is a possible effect.

Further, since the power supply member and the power receiving member are arranged at the opposing portions of the processing table and the pallet, when the pallet is clamped on the processing table, the power supply member and the power receiving member are automatically aligned with each other. Therefore, the above-mentioned non-contact power supply can be realized without providing a separate power supply and power receiving member positioning mechanism, and there is an effect that the pallet can be quickly replaced and the work efficiency can be improved.

According to the pallet power supply structure according to the second aspect of the present invention, since the male tapered surface is provided on the opposing surface of the power supply member located on the lower side, the accumulation of cutting chips on the opposing surface and the cutting oil There is an effect that accumulation can be avoided and reliability can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall layout view of a machine tool provided with a pallet power supply structure according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional front view of a working table for explaining a power supply structure according to a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machining table 2 Pallet 5 Non-contact power supply device 51, 52 Power supply side, power receiving side core (power supply, power receiving member) 51a, 52a Male, female tapered surface 62 Vertical machining center (machine tool)

Claims (2)

(57) [Scope of request for utility model registration] 1. A pallet power supply structure of a machine tool for supplying electric power from an external source to a pallet mounted and fixed so as to be exchangeable on a processing table and to maintain a predetermined positional relationship. The member is arranged and fixed at the pallet-facing portion of the processing table, and the power receiving member is located at the processing table-facing portion of the pallet so as to face the power supply member with a predetermined gap therebetween when the pallet is placed and fixed on the processing table. A pallet power supply structure for machine tools, which is fixed. 2. The device according to claim 1, wherein the opposing surface facing the power supply member is formed in a male taper shape, and the opposing surface facing the power receiving member is formed in a female taper shape. Pallet feeding structure for machine tools.