JPH077081Y2 - Spindle feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a spindle feed device, and more particularly, to a spindle feed device in which thermal displacement on the tip end side of a spindle is suppressed even by heat generation of a spindle bearing portion.

<Prior Art> Fig. 2 shows the structure of a boring spindle feeding device for an boring machine, in which a boring tool (boring bite) is attached to a spindle and is inserted into a hole while being rotated to perform boring.

The boring spindle 1 is inserted through the spindle head 2 and is slidably supported on the outer periphery by the hollow shaft 3. This hollow shaft 3 is a bearing
A bearing housing 5 is interposed between the bearings 4a, 4b and the spindle head 2 and is supported at two locations by 4a, 4b.

The boring main shaft 1 has a long groove 6, and rotational force from a gear 7 integrally attached to the outer periphery of the hollow shaft 3 is fitted into the gear 7 and a key 8 fitted into the long groove 6 is used to insert the rotary force. It is designed to communicate.

Further, a feed screw shaft 9 is rotatably supported at one end thereof on one side with a boring main shaft 1 extending therebetween on the rear surface of the main spindle head 2. A connecting rod 10, which is a connecting member, is inserted into the other side of the boring main shaft 1 at one end so that the nut 10
It is provided with a attached. The feed screw shaft 9 and the connecting rod 10 are parallel to each other.

A feed member 11 is inserted through the feed screw shaft 9 and the connecting rod 10. The feed member 11 supports the rear end of the boring main shaft 1 via a bearing 13. The bearing 13 is supported by the stopper 14 on the feed member 11 and by the nut 15 on the boring main shaft. Further, a female screw 12 is integrally attached to the feed member 11 through which the feed screw shaft 9 is inserted by a bolt or the like and is screwed to the feed screw shaft 9. The other end of the feed screw shaft 9 is provided with a gear 19 through a bearing 17 'after a fixing member 18 is inserted through a bearing 17. Meanwhile, the connecting rod 10
A nut 20 is screwed to the other end of the other end of which the reduced diameter portion is threaded after the fixing member 18 is inserted.

In the spindle feed device having such a configuration, the boring spindle 1 is driven and rotated via the key 8 by the rotation of the gear 7. The boring spindle 1 is fed and moved along the connecting rod 10 by the movement of the feeding member 11 caused by the rotation of the gear 19.

<Problems to be Solved by the Invention> In the above spindle feeder, the boring spindle 1 rotates at a high speed, so that the bearings 4a and 4b become hot,
There has been a problem that the boring spindle 1 thermally expands and expands forward to cause a processing error. Further, in the main shaft to which the ram is connected, the temperature of the main shaft bearing similarly rises, heat is transferred to the ram, and thermal expansion and expansion occur, causing a processing error.

In view of the above problems, the present invention cools a portion of the spindle that generates heat by rotating the spindle, and sends the deprived heat to the fixed member side to expand and expand from the connecting rod to the fixed member to pull back the spindle together with the feed member. An object of the present invention is to provide a spindle feed device capable of reducing the forward extension of the spindle.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides a main shaft to which a tool is attached or a ram is connected, and the main shaft is rotatably and axially movable via a bearing. A supporting spindle head, a feed member attached to a rear end of the spindle, one end fixed to the spindle head, and a feed screw screwed to the feed member,
A machine main body side fixing member that rotatably supports the rear end of the feed screw and is expandable and contractable with respect to the spindle head; one end of the main body is connected to the spindle head and the other end is connected to the fixing member;
A connecting member slidably fitted to the feed member, a groove formed around the bearing of the spindle head, through which the cooling liquid flows, and a cooling liquid that has flowed through the groove is supplied to the tip end side of the spindle. And a cooling passage formed in the connecting member to guide it toward the rear end side.

<Operation> By adopting the above means, the present invention cools the heat generated in the main shaft bearing portion due to the high speed rotation of the main shaft by supplying the cooling liquid around the bearing and takes away this heat. By sending the cooling liquid through the connecting member to the machine body side fixing member that can expand and contract with respect to the spindle head, the connecting member expands and contracts rearward with respect to the spindle head, and suppresses expansion to the front of the spindle.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the boring shaft feed supporting device of the present invention.

The same members as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

A groove 21 is provided on the outer periphery of the bearing housing 5, and a supply passage 22 is communicated with the front side of the groove 21 from the outside of the spindle head 2. Further, a hole is also formed on the rear side of the groove 21 from the outside of the spindle head 2, the inlet portion is closed with a plug 23, and a hole communicating with the spindle head cavity in the direction perpendicular to the axis is communicated in the middle of this hole. The hole and the latter hole are combined to form the discharge path 24.

A cooling passage 26 penetrating in the axial direction at the center of the connecting rod 10.
Are formed. Then, the discharge passage 24 and the cooling passage 26
And are connected by conduit 25.

The cooling passage 26 is connected to a refrigerator (not shown), and a cooling liquid is circulated and supplied to the groove 21.

The operation of the boring spindle feed supporting device having the above configuration will be described. Gear 7 that meshes with a drive gear (not shown)
By rotating at high speed, this rotation is transmitted to the boring main shaft 1 via the key 8. As a result, the boring spindle 1 rotating at high speed causes the bearings 4a and 4b, which are the supporting members thereof, to generate heat. This heat is transmitted to the surroundings as well as to the boring spindle 1. At this time, by supplying the cooling liquid 27 from the refrigerator (not shown) through the supply passage 22, the cooling liquid 27 fills the groove 21 provided on the outer periphery of the bearing housing 5,
The heat generated from 4a and 4b is absorbed, and the extension of the boring spindle 1 is made slight. The cooling liquid 27 that has absorbed heat from the bearings 4a and 4b then passes through the discharge passage 24, the conduit 25, and the cooling passage 26. At this time, heat is dissipated in the cooling passage 26, the connecting rod 10 is thermally expanded and expanded, and the pulling force acts on the boring main shaft 1 via the feeding member 11 to the rear side, which cancels out the work to try to extend to the front side of the main shaft. To be done. As a result, the forward movement of the tool, which is mounted in the groove 16 of the boring spindle 1 and is used for machining, is small and almost equal. Therefore, the processing will not be out of order.

In this embodiment, the feed screw shaft 9, boring main shaft, and connecting rod 10
Are on the same plane, but needless to say, the present invention is not limited to this.

<Effects of the Invention> With the configuration of the present invention, the heat generated when the main shaft rotates is absorbed by the cooling liquid that circulates around the refrigerator, and the heat is absorbed by the fixed member side. Since the liquid is sent to extend the connecting rod etc., extension due to thermal expansion of the spindle is suppressed by canceling the extension, and the forward displacement of the tool mounted on the spindle to be machined is suppressed as much as possible and the machining is not misaligned. Become.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment relating to the spindle feed device of the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional spindle feed device. In the figure, 1 ... boring spindle, 2 ... spindle head, 3 ... hollow shaft, 4a, 4
b, 13,17,17 '…… Bearing, 5 …… Bearing housing, 6 ……
Long groove, 7,19 …… Gear, 8 …… Key, 9 …… Feed screw, 10…
… Connecting rod, 10a, 15,20 …… Nut, 11 …… Feeding member, 12
...... Female screw, 14 …… Stopper, 16,21 …… Groove, 18 …… Fixing member, 22 …… Supply path, 23 …… Plug, 24 …… Discharge path, 25…
… Conduit, 26 …… Cooling passage.

Claims (1)

[Scope of utility model registration request] 1. A main shaft to which a tool is attached or a ram is connected, a main spindle head for supporting the main shaft via a bearing so as to be rotatable and axially movable, and a feed attached to a rear end of the main shaft. A member, a feed screw whose one end is fixed to the spindle head and which is screwed to the feed member, and a machine body side fixing member which is rotatably supporting the rear end of the feed screw and is expandable and contractable with respect to the spindle head. A connecting member, one end of which is connected to the spindle head and the other end of which is connected to the fixing member, and which is slidably fitted to the feed member; and a cooling liquid formed around the bearing of the spindle head. Of the main shaft, and a cooling passage formed in the connecting member for guiding the cooling liquid that has flowed through the groove from the front end side to the rear end side of the main shaft. apparatus.