JPH0453879Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cast bearing surface for a machine tool having a hybrid guideway composed of a rolling guideway and a sliding guideway.

[Conventional technology]

Conventionally, the guide surfaces of cast metal bearings of machine tools are either left as sliding guide surfaces or are made of rolling guide surfaces by attaching steel material to compensate for the lack of hardness of the casting.

[The problem that the idea aims to solve]

However, on the guide surface of a cast metal support stand of a machine tool, the sliding resistance of the cast metal sliding guide surface is large, so the load on the feed screw is large, and the responsiveness in feed control is poor, causing a decrease in machining accuracy and positioning accuracy. It is becoming.

In addition, the rigidity of the rolling guide surface attached to the steel material decreases, and the machining ability in heavy cutting decreases.

This invention provides a cast metal support for a machine tool that is equipped with a hybrid guideway that compensates for the drawbacks of a cast sliding surface and a steel-mounted rolling guideway.

[Means for solving problems]

The casting support for a machine tool of this invention has a hardened thin steel plate and a synthetic resin coating adjacent to each other and attached to the casting guide surface in parallel to the feeding direction, and the hardened thin steel plate surface covers the rolling guide surface. Hybrid guide surfaces, whose synthetic resin-coated surfaces form sliding guide surfaces, are arranged parallel to each other and spaced apart from each other on both sides.

[Effect]

The rollers of a movable body such as a table placed on the hybrid guide surfaces on both sides of the cast support of the machine tool roll on the surface of the hardened thin steel plate, and the sliding surface of the movable body rolls on the surface coated with synthetic resin. By sliding the movable body on the cast metal support base.

〔Example〕

An embodiment of this invention will be described with reference to the drawings.

In FIG. 1, casting guide surfaces 7 are provided on both sides of the upper surface of a casting bed 1 of a machine tool, and on each casting guide surface 7, a rolling guide surface 4 and a sliding guide surface 5 are adjacent and parallel. A hybrid guide surface is provided. A table 2 (moving body) placed on a casting bed 1 of a machine tool is supported on both sides by hybrid guide surfaces, and is fed by a ball screw 3 in a direction perpendicular to the plane of the paper.

The main part of the hybrid guideway consisting of the rolling guideway 4 and the sliding guideway 5 is shown in FIG.
is adhered to the casting guide surface 7 of the casting bed 1 along its outer edge with an adhesive.

Although it may remain attached with adhesive, the casting guide of the casting bed 1 is further attached using a bolt 9 via a presser foot 8 along the inner edge of the hardened thin steel plate 6. It may be fixed to surface 7. In addition to the fixing means, fixing using countersunk head screws is also available. By adding such a fixing means, the hardened thin steel plate 6 can be integrated into the casting bed 1 more reliably.

For the hardened thin steel plate 6 of the rolling guide surface 4, for example, SK3 having a Rockwell hardness of 58 or more is used. Alternatively, band saw material can also be used.

Adjacent to the inside of the rolling guide surface 4 is a sliding guide surface 5 coated with a synthetic resin coating 10, which is provided parallel to the rolling guide surface 4 to form a hybrid guide surface.

Table 2 placed on the hybrid guideway
A roller 1 is provided on the bottom surface of the
1 is provided, the roller 11 is supported on the rolling guide surface 4, and the sliding surface 12 on the inside of the roller mounting portion on the lower surface of the table 2 is supported on the sliding guide surface 5. It is movable by the sliding movement of the sliding surface 12, and is sent in a direction perpendicular to the paper plane by the rotation of the ball screw 3.

In the above embodiments, the moving body of the machine tool is exemplified as a table, but it is not limited to this.

[Effect of idea]

The machine tool casting support of this invention has hybrid guide surfaces spaced apart and parallel to each other on both sides, so the sliding resistance is reduced as a sliding guide surface while maintaining high rigidity due to the synthetic resin coating.
In addition, since the feed load on the rolling guideway is reduced, it prevents deterioration of responsiveness in feed control due to sliding resistance, which causes a decline in machining accuracy and positioning accuracy in machine tools, and is compatible with heavy cutting. The high rigidity that can be achieved is maintained.

Furthermore, since hybrid guide surfaces are used on both sides of the cast support, the difference in sliding resistance of the moving body between the two hybrid guide surfaces is small. the result,
The moving direction of the moving object is not affected by meandering or inclination.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the casting bed and table of a machine tool equipped with a hybrid guide surface according to this invention, and FIG. 2 is an enlarged partial view of FIG. 1. 1...Casting bed, 2...Table, 3...Ball screw, 4...Rolling guideway, 5...Sliding guideway, 6...Hardened thin steel plate, 7...Casting guideway, 8...
... Presser foot, 9 ... Bolt, 10 ... Synthetic resin coating, 11 ... Roller, 12 ... Sliding surface.

Claims (1)

[Scope of utility model registration request] A hardened thin steel plate and a synthetic resin coating are attached adjacent to each other to a casting guide surface parallel to the feeding direction, with the hardened thin steel plate surface forming a rolling guide surface and the synthetic resin coating surface forming a sliding guide surface. A cast metal support for a machine tool in which hybrid guideways forming spaced parallel surfaces are provided on both sides.