JPH0338061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a structure of a sliding guide surface of a machine tool that reduces the conduction of heat to the parts, especially the bed, where precision is reduced when deformation due to heat occurs in the machine tool. Regarding.

Prior art The sliding guideways of machine tools change due to the influence of high frictional heat due to the high speed of the moving parts, and the stable guideway accuracy required for high precision cannot be maintained, which is an important problem. This is becoming one of the problems. For this reason, a cooling method using a heat pipe has been considered, but it has many practical problems in terms of space installation and cost.

OBJECTIVES Therefore, the present invention aims to provide a sliding guide surface that can achieve high mechanical accuracy by blocking heat conduction to the bed, which is problematic due to thermal deformation.

Solution The present invention forms a first layer for heat insulation using a material with low thermal conductivity on the sliding guide surface of the bed where heat conduction is to be blocked, and takes into account the poor workability of this heat insulation layer. Therefore, it has a multilayer structure in which a second layer that can be precisely machined and becomes a sliding surface is formed thereon.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. On sliding guide surfaces such as beds, bed 1
Upper surfaces 2a, 3a and friction surfaces 2b, 2c on both sides, on which a carriage or a table sliding on the sliding guide surfaces 2, 3 having, for example, two parallel T-shaped cross sections come into contact: The thermal conductivity k of iron material S45C on the top surface of 3b and 3c is k = 0.105cal/cm・sec℃,
Thermal conductivity k= compared to the value of k=0.11 for SCM21
Ceramic zirconia (ZrO ₂ ) as low as 0.0006
The flat plate is made of epoxy resin with low thermal conductivity k =
0.0034 adhesive or an adhesive containing special filler, or by thermal spraying.
First layers 4 and 5 of about 0.5 mm are formed. This zirconia has high hardness and is difficult to process, so it cannot be used as is after layer formation and is easily chipped by impact.
On layers 4 and 5, as second layers 6 and 7, Al ₂ O ₃ with k=0.06, which has workability that allows precision processing, wear resistance, and seizure resistance, is bonded with an adhesive such as epoxy resin. The second layers 6, 7 having a thickness of about 0.5 mm are formed by thermal spraying. Then, using a bed grinder, the sliding surfaces 2a, 2b, 2c: 3a, 3b, 3
The second layers 6 and 7 of c are finished in parallel. Beds constructed in this way can be operated continuously for long periods of time, and even though the temperature of the sliding surface on the table side increases, the heat conduction to the bed is suppressed by the heat insulating material, which has low thermal conductivity. The temperature changes are small and the temperature changes are gradual.

Although the embodiment shows a bed, the present invention is not limited to this and can of course be applied to sliding guide surfaces of other parts.

Effects As described in detail above, the present invention includes a first layer of zirconia, which has a much lower thermal conductivity than metal, on the sliding guide surface of a bed, etc., and a ceramic material that can be easily or precisely processed on top of the first layer of zirconia, which has a much lower thermal conductivity than metal. Since the second layer is formed on the outside, there is no need to complicate the structure to suppress heat conduction, and no space is required for it. Heat conduction to the bed, etc. is suppressed, resulting in less thermal displacement and long-term operation. However, the accuracy of the machine can be maintained, and the displacement itself becomes gentler, making it easier to control heat compensation, and the cost can be lower than that using heat pipes. In addition, since ceramics, which are easy to process, are used for the second layer serving as the sliding surface, a high-precision finish can be obtained, which does not interfere with the manufacture of high-precision machines.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of the sliding surface of the bed. 1... Bed, 2, 3... Sliding guideway, 4, 5
...First layer, 6,7...Second layer.

Claims (1)

[Claims] 1 Form a first layer for heat insulation using a material with low thermal conductivity such as ceramic on the sliding guide surface of a bed etc. where heat is conducted by frictional heat, and then form a precision layer that will become the sliding surface on top of that. A structure of a sliding guide surface for a machine tool, characterized by forming a second layer of a processable material to reduce thermal displacement of the bed, etc.