JPS5856718A - Upright drilling machine - Google Patents

Abstract

PURPOSE:To eliminate a special guide means for a spindle head, by balancing the weight of the spindle head slidable on a guide bed by means of a swingable arm pivotally supported to the guide bed so that high speed movements of the spindle head in two dimentional directions are made possible. CONSTITUTION:A guide bed 15 is slidably guided along a cross-rail 14 supported on the top ends of a pair of columns 12, 13, and a spindle head 16 is slidably guided in the vertical direction at the front surface of the guide bed 15. A pair of swingable arms 33, 34 are pivotally supported at P to supporting shafts 31, 32 on both side surfaces of the guide bed 15 so that the swingable arms 33, 34 may be swung at the middle points thereof. One end of the arms 33, 34 is pivotally supported to either side surface of the spindle head 16 through intermediate links 35, 36, and the other end is secured with a weight 39. With this arrangement, the total weight of the guide bed 15, including the weights of the head 16 and the weight 39 is supported by a weight supporting rail 45 arranged perpendicularly below the pivot point P, thereby high speed movements of the bed 15 relative to the rail 14 are made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical drilling machine having a spindle head that is slidably guided in the vertical direction as well as in a direction perpendicular thereto, and in particular, it relates to a vertical drilling machine that enables high-speed movement of the spindle head. This invention relates to a spindle head weight balance device.

In general, there are two types of weight balancing devices: one uses a fluid pressure cylinder to balance the weight, and the other uses a weight suspended from a chain or the like to balance the weight.

The former method has the advantage of requiring a small installation space, but as the vertical movement speed of the spindle head increases, the required flow rate increases, requiring a fluid supply source with a large flow rate, which is not only uneconomical but also causes an increase in cost. It becomes. Furthermore, for speeds exceeding a certain limit, even if the capacity of the fluid supply source is increased, the resistance of the pipe increases, resulting in poor followability and a problem that impedes higher speeds.

The latter method requires a larger installation space, but does not require a fluid supply source, so it can be constructed relatively inexpensively.

Moreover, it poses almost no obstacle to increasing the vertical movement speed of the spindle head.

However, a weight suspended from a chain or the like does not have its own restraining force against lateral displacement, and therefore requires guide means for restraining lateral displacement. Particularly in the case of a spindle head weight balancing device for a vertical drilling machine in which the spindle head moves at high speed not only in the vertical direction but also in a direction perpendicular to the spindle head, such guide means must also be special and an increase in cost cannot be avoided. .

In order to eliminate such conventional drawbacks, the present invention connects the weight and the spindle head to one end and the other end of a pair of swinging arms that are swingably supported at approximately the midpoint, and does not require any special guide means. The object of the present invention is to improve the lateral rigidity of the weight, enable high-speed movement of the spindle head in two-dimensional directions including vertical movement, and reduce costs.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show the configuration of a vertical drilling machine. 10 is a bed, 11 is a work table that is slidably guided on the bed 10, and 12 and 13 are units that stand on both sides of the bed 10. A pair of columns installed, 14 is a pair of columns 1
2. A cross rail supported at the upper end of 13, a guide stand 15 slidably moved east and west along the cross rail 14,
16 is a main shaft head guided vertically slidably on the front surface of the guide table 15; 17 is a vertical main shaft rotatably supported on the main shaft throat 16; 18 is a drive motor that rotationally drives the main shaft 17; , O22, which is connected to the main shaft 17 via the belt 21, is a cylinder operatively connected to a clamping device built into the center of the main shaft for clamping and unclamping the tool T inserted into the tip of the main shaft 17. .

As shown in FIG. 3, the guide means for slidably guiding the work table 11, guide stand 15, and spindle head 16 includes a rail member having a ball groove G formed therein and a ball on this rail member. A guide member M is guided so as to be relatively movable via a ball B rolling in a groove G. 23 is a servo motor for feeding the work table, 24 is a servo motor for feeding the guide table 15 guided by the cross rail 14, and 25 is a servo motor for feeding the main shaft/end 16, which is a feed screw screwed into each movable body. 23a, 2
4a and 25a. Each servo motor 2
3.24.25 is connected to a numerical control device via a drive unit (not shown), and its rotation is controlled by a control signal based on numerical command data, and relative feed control between the work table 11 and the spindle 17 of the spindle head 16 is performed. It will be done.

- For example, the maximum feed speed is 20 m/min or more.

The structure of the weight balance device 30 of the spindle head 16 that enables such high-speed feeding will be described next. Said guide stand 1
A pair of support shafts 31.32 are provided horizontally on both sides of the support shaft 31.32, and a pair of swing arms 33.32 are attached to the support shafts 31.32.
34 is pivotally supported approximately at the center thereof. Intermediate links 35 and 36 are pivotally connected to one end of the swing arm 33 and 34, and the other end of the intermediate link 35 and 36 is pivotally connected to support shafts 37 and 38 that protrude from both sides of the spindle head 16. There is. A weight 39 having a weight corresponding to the total weight of the spindle head 16 is fixed to the other end of the swing arm 33,34. Also, the ends of the swinging arms 33, 34 are connected by a connecting plate 40. As a result, the weight 39 and the pair of swinging arms 33.
34 is integrated and forms a frame with the guide stand 15 as a support for the support shafts 31 and 32, and the weight balance device 30 itself has a highly rigid structure with respect to the sliding direction of the guide stand 15. ing. Further, an intermediate link 3 is provided between one end of the swing arm 33, 34 that moves in a circular arc and the main shaft head 16 that moves in a linear motion.
5.36 is interposed, a support shaft 37.38 and a pivot 41.4
2, the swing arms 33 and 34 can be operated without any trouble, and the pivot points P at approximately the midpoints of the swing arms 33 and 34 can be fixed. This pivot point P is provided above the weight support rail 45, which supports the weight acting on the guide table 15, of the pair of guide rails 45 and 46 that guide the guide table 15. Therefore, the weight of the spindle head 16 and the weight 39 is
Since the entire weight of the support member 5 is supported by the weight support rail 45 provided vertically below the pivot point P, no moment is applied that would deform the guide stand 15. This is an extremely advantageous configuration even when the guide platform 15 moves at high speed along the #2 slide 14.
This is advantageous in that it is possible to suppress the occurrence of deformation due to the moment of inertia.

Note that the intermediate links 35 and 36 form a connecting member that connects one end of the swing arm 33 and 34 that rotates while allowing the linear movement of the spindle head. It can also be used as a full connection member. In addition, a long hole is formed at one end of the swinging arm and a pin weight protruding from the spindle head 6 not only balances the weight of the spindle head, but also balances the weight of the spindle head against high-speed movement of the guide table that guides the spindle head vertically. Since the rigidity can be increased, there is no need for special guide means like in conventional equipment, so the vertical drilling machine can be manufactured at a lower cost, and the two-dimensional movement of the spindle head can be achieved at higher speeds, resulting in higher productivity. It has the advantage of being able to obtain a high vertical drilling machine.

Furthermore, by setting the pivot point of the swing arm above the weight support rail, it is possible to achieve the effect of reducing deformation due to the moment of inertia due to high-speed movement in the direction of the pivot axis.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view;
FIG. 2 is a right side view, and FIG. 3 is an enlarged sectional view of each guide portion. 1o...Bed, 11...Work table, 12゜13...Column, 14...Cross rail, 15...
・Guide table, 16...Spindle head, 17...Spindle, 3
0... Weight balance device, 31.32.37.38...
・Spindle, 33.34... Swing arm, 35.36...
- Intermediate link, 39... weight. Patent applicantToyoda Machinery Co., Ltd.Figure 1Figure 2

Claims (2)

[Claims] (1) A vertical drilling machine having a spindle head that is guided so as to be relatively movable in two-dimensional directions including vertical movement, which has a guide surface that guides the spindle head so as to be slidable in the vertical direction, and this guide surface. Guide V so that it can slide in the direction perpendicular to
- The pair of swinging arms including the guide guided by the rail are pivoted coaxially at approximately the midpoint with the same distance in the axial direction, and each end of each swinging arm is movable to allow linear movement of the spindle head. A vertical drilling machine comprising a spindle head weight balancing device connected to the spindle head via a connecting member that is connected to the spindle head, and having a weight corresponding to the weight of the spindle head fixed to each other end of the swing arm. (2) The vertical drilling machine according to claim 1, wherein the pivot point of the pair of swing arms of the guide stand is provided vertically above the center of the weight support rail of the guide rail.