JPH0337866Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for preventing thermal deformation of a spindle head support.

<Prior Art> As shown in FIG. 4, a conventional spindle head 110 that supports a rotating spindle 111 includes a motor 112 as a spindle drive source and a rotational force of the motor that is connected to the spindle 111.
A speed reduction mechanism 113 for transmitting power to the main shaft head 110 is incorporated therein, and a support body 100 for supporting the spindle head 110 is provided. The support 100 may be integrated with the spindle head 110 as shown in FIG. 4, be provided with a spindle head that can be shifted up and down as shown in FIG. 1, or be a box as shown in FIG. There are things that make up the shape column. Each of these supports has a pair of side walls 102 extending rearward from a support front wall 101 that fixedly supports the spindle head and having reinforcing ribs 103 formed on the inner surface thereof. A rear wall 104 is further added to the box column support 100 described above. Such side wall 1
02 and the rear wall 104 are thin and have a large surface area due to the reinforcing ribs 103, resulting in a small heat capacity. Moreover, hot air discharged from the spindle drive motor often comes into direct contact with this side wall.
On the other hand, the support front wall 101 that supports the spindle head 110 is thick and has a larger heat capacity than the side walls and rear wall.

<Problems to be solved by the invention> Therefore, if the operation is started early in the morning when the temperature is low, the temperature rises and the heat dissipation from the motor causes the temperature of the side wall, which has a small heat capacity, to rise first, and due to thermal expansion, the spindle head support part Thermal deformation occurred, causing the blade to tilt forward, reducing machining accuracy.

<Means for solving the problem> Therefore, the present invention covers at least the surfaces of the side walls and rear wall, which have a small heat capacity, with a heat insulating material, so that the temperature changes slowly in response to changes in atmospheric temperature, and the exhaust heat of the motor is reduced. It also makes it less susceptible to influence.

<Function> The side walls and rear wall that form the support are less susceptible to atmospheric temperature changes and motor exhaust heat due to the heat insulating material covering their surfaces, which slows down temperature changes in areas with small heat capacity. , the temperature difference with the front wall of the spindle head support is reduced, preventing thermal deformation.

<Examples> Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a machining unit 10 of a dedicated machine tool, where 10 is a sliding table guided by a guide surface 12 on a base 11, 13 is a main shaft head that rotatably supports a main shaft 14, a reduction gear part 15, It is integrated with the main shaft drive motor 16. 20 is such a spindle head 1
3, a vertical guide surface 22 is formed on the front wall 21 of the support part, and the main shaft head 13
is provided so as to be shiftable by a cylinder 19, and is further provided with a side wall 23 extending rearward from the front wall 21, and a reinforcing rib 24 is formed on the inner surface of the side wall 23. The entire surface of this side wall 23 is covered with a heat insulating material 25 made of a foamed polystyrene plate with a thickness of about 20 mm.
are bonded and covered with adhesive. Incidentally, instead of bonding the plate materials with adhesive, as shown in FIG. 3, the concave portions of the reinforcing ribs may be filled with polystyrene foam and integrally bonded.

Further, the heat insulating material is not limited to foamed polystyrene, but may be made of a fiber layer such as glass wool.

In the case of a column having a box-shaped structure as a support, not only the side walls but also the rear wall surfaces are coated with a heat insulating material.

<Effects of the invention> According to the invention, the surface of the side wall or rear wall, which has a small heat capacity and is in direct contact with the cooling air of the spindle drive motor, is coated with a heat insulating material, so that it can be prevented from changing in air temperature or increasing the temperature of the motor. It is possible to prevent thermal deformation of the support body caused by this, and a decrease in processing accuracy due to the inclination of the front wall of the support portion can be prevented with an extremely simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a front view of the processing device, Fig. 2 is an enlarged partial sectional view taken along the - line in Fig. 1, Fig. 3 is a view corresponding to Fig. 2 as another embodiment, and Figs. 4 and 5 are It is a figure which shows the structure of a support body as a conventional example. 13...Main shaft head, 15...Reducer section, 16
...Spindle drive motor, 20...Support, 23...
Side wall, 25...Insulation material.

Claims (1)

[Scope of utility model registration request] A spindle head support that movably or fixedly supports a spindle head that supports a rotating spindle, and has at least a side wall extending rearward from a front wall of the support portion and having reinforcing ribs, wherein the support 1. A device for preventing thermal deformation of a spindle head support body, characterized in that a side wall surface having reinforcing ribs is covered with a heat insulating material.