JP2000015531A - Bed fixing method of cylindrical grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the temperature of respective parts of a bed uniform by arranging a steel pipe for flowing a liquid whose temperature is controlled to the upper layer of a concrete and the inner deep part of the concrete and exchanging a heat between the liquid in the steel pipe and the concrete. SOLUTION: The oil whose temperature is controlled is supplied from the inlet of the steel pipe 9 for passing a liquid while making the atmosphere temperature of a machining work space to a standard and also discharged from its outlet and returned into a tank again. The steel pipe 9 is made to two systems so that one system is arranged on the upper layer of a concrete 6a and the other system is arranged in the inner deep part of the concrete 6a. The heat of a grinding liquid is transmitted to a main body 6 through a cast steel made receive stand 7 and a cast steel made pedestal 8. Even if the upper part of the main body 6 is going to be heated by a thermal transmission, the oil in the steel pipe 9 for passing the liquid takes away the heat of the concrete 6a quickly and carries away to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a machine tool bed made of concrete and a bed of a cylindrical grinder.

[0002]

2. Description of the Related Art A cylindrical grinding machine as shown in FIG. 4 is known. The bed 1 of this grinding machine has a horizontal part 2 and a depth part 3
The workpiece support portion 4 is provided on the upper surface of the horizontal portion 2, and the grindstone support portion 5 is provided on the upper surface of the vertical portion 3.

On the other hand, Japanese Patent Application Laid-Open No. Hei 6-304831 discloses a technique for suppressing a variation in temperature rise of a concrete bed in a machine tool to prevent thermal deformation.

[0004]

During use of the above-mentioned grinding machine, the work support 4 and the grindstone support 5 generate heat, and the processing heat generated when processing the work reduces the temperature of the grinding fluid. The bed is heated and the heat is transferred to the upper surface of the bed 1 and the bed rises in temperature. At this time, since the distribution of the heat source and the amount of heat radiated from each part are not uniform, the temperature of each part of the bed 1 becomes non-uniform, resulting in deformation.

To explain this situation in more detail, the temperature of the upper portion of the bed 1 tends to be excessively increased as compared with that of the lower portion, whereby the bed 1 is deformed so as to be upwardly convex as shown by an arrow f. . This deformation is the work support 4
The distance L between the workpiece center p1 and the wheel center p2 of the wheel head support 5 is increased.

[0006] Further, the above-mentioned deformation changes every moment when the thermal balance of the bed 1 is in a transient state.
Therefore, the distance L also changes every moment in relation to this change. This increase in the distance L and its temporal change are detrimental to the processing accuracy required in precision processing.

However, the technology described in Japanese Patent Laid-Open No. 6-304831 concerning a concrete bed cannot effectively prevent the bed from being bent due to the above-mentioned factors. It is an object of the present invention to provide a machine tool bed and a cylindrical grinding machine bed which can reasonably cope with such a situation.

[0008]

In order to achieve the above-mentioned object, according to the present invention, in a machine tool bed (such as a bed of a cylindrical grinder) made mostly of concrete, the temperature of the concrete portion is controlled in a concrete portion. A steel pipe for flowing the liquid is embedded, and heat exchange is performed between the liquid in the steel pipe and concrete.

[0009] The fact that the bed is made of concrete suppresses the transfer of heat generated in the processing by the working portion on the upper surface of the bed from the upper surface of the bed to the entire bed.
On the other hand, the heat transferred to the bed is transferred to the liquid in the steel pipe and taken out. Thereby, the temperature of each part of the bed can be quickly made uniform. Also, since the coefficient of thermal expansion of the steel pipe is similar to that of concrete, even if these change in temperature, the adhesion between the steel pipe and concrete is not impaired, and the heat conduction between the steel pipe and concrete is maintained well It will be.

The present invention is embodied as follows. That is, concrete made of a ceramic composite material is used, and oil is used as a liquid. Thereby, the thermal expansion coefficient of the concrete is more similar to that of the cast steel material, and the bed is suitable for fixing a work part (a work supporting part or a grindstone part) made of the cast steel material. In addition, oil has a large specific heat and is not easily deteriorated by heat, so that it is suitable for heat exchange and also inhibits corrosion of steel pipes.

[0011] Also, approximately 100
The said steel pipe is arrange | positioned at the pitch of 400 mm or less in the surface layer part within mm. As a result, heat transferred to the bed is taken out early through the steel pipe and the liquid at an early stage, and an excessive rise in temperature at the top of the bed is effectively prevented.

[0012]

1 and 2 are views showing a bed of a cylindrical grinding machine according to an embodiment of the present invention, and FIG. 3 is an explanatory view of the bed. As shown in these figures, the bed of the present embodiment has a bed body 6 composed of a horizontal portion 2 and a depth portion 3 and a work support portion (not shown) fixed to the upper surface of the horizontal portion 2 and slidably displaced laterally. A cast steel pedestal 7 that can be freely supported and a cast steel pedestal 8 for fixing a grindstone support portion (not shown) are provided.

The bed main body 6 will be described in more detail as follows. That is, the concrete part 6a, which is mostly made of concrete, has a relatively thin steel pipe 9 having a nominal diameter of about 10A to 25A or a steel pipe 10 having a relatively large diameter for piping and wiring. Etc. are buried. In this case, the concrete is made of a ceramic-based composite material, and its constituent materials include concrete, graphite, and non-fired ceramics. Alternatively, resin concrete, Portland cement concrete, or the like may be used.

The liquid-passing steel pipe 9 is formed by connecting a plurality of pipes a1 to a11 formed of carbon steel pipes for piping in a straight line via a steel elbow joint b.
The fifth to fifth pipe portions a1 to a5 have a depth range of 100 mm or less from the upper surface of the concrete portion 6a (the concrete portion 6a).
And the sixth to eleventh tube portions a6 to a11 are embedded in a range near the half height of the main body 4 from the upper surface of the main body 4. At this time, the outer end of the first tube part a1 is used as a liquid inlet, and the outer end of the eleventh tube part a11 is used as a liquid outlet.

The steel pipe 10 for wiring and piping has a plurality of horizontal pipes c1 to c5 communicating with each other in the vicinity of half the height of the main body 4 so as to extend from specific horizontal pipes c3 and c4 to vertical pipes c6 and c6.
7 is erected in a communicating manner, and a pipe member c8 bent at 90 degrees is erected at a specific position to be embedded in the concrete part 6a. In addition, the pipe parts c1 to c1 reaching the side and upper surfaces of the main body part 6 are formed. The outer ends of c7 and the pipe member c8 are open outward.

A metal fitting 12 into which a thread portion of a leg member 11 forming a jack bolt is screwed is embedded inward from the outer periphery of the bottom surface. A horizontal and vertical lifting steel pipe 13 extends through lower portions of both ends of the horizontal portion 2, and a horizontal and horizontal lifting steel tube 14 extends through a lower rear end of the vertical portion 3. Furthermore, various necessary fittings d1, d2, d
3, d4 is buried.

Next, the cast steel receiving base 7 and the cast steel pedestal 8 will be described. The cast steel receiving base 7 has a guide surface e for guiding a work support (not shown) on the upper surface so as to be slidable and displaceable.
e, and the lower surface thereof is in close contact with the upper surface of the concrete portion 6a of the main body portion 6, and further has a protruding leg portion g1 protruding downward from a plurality of appropriately spaced portions in the longitudinal direction of the lower surface. It has been assumed.

The cast steel pedestal 8 is a plate having a rectangular frame shape in a plan view, and the lower surface of the pedestal 8 is formed on a lower surface of the pedestal 8 from a plurality of appropriately spaced portions in the longitudinal direction similarly to the cast steel cradle 7 described above. It is provided with a protruding leg portion g2 protruding toward. The fixing of the pedestal 8 is performed in the same manner as in the case of the cast steel receiving base 7.

An example of manufacturing the bed according to the present invention configured as described above will be described. First, each component (cast steel receiving stand 7, cast steel pedestal 8, steel pipe 9 for liquid passage, steel pipe 10 for piping and wiring, steel pipes 13 and 14, etc. for lifting) is placed on a production table in an inverted state. At this time, each component is held in its position by using an appropriate steel bar or the like.

After a concrete form is formed so as to surround the whole of these components, concrete is poured into the form and solidified. After the concrete has solidified, the formwork is removed, whereby a nearly finished bed is obtained, and finally the cast steel pedestal 7 and the cast steel pedestal 8 are machined to complete the upper side.

The bed thus manufactured is mounted on a cast steel receiving table 7 with a work supporting portion (not shown) and a cast steel pedestal 8 with a grindstone portion (not shown) to form a part of a cylindrical grinding machine. When using the cylindrical grinding machine formed as described above, prepare an oil as a heat medium whose temperature is controlled based on the ambient temperature of the working space in an oil tank equipped with an appropriate temperature control device. The oil is supplied from the inlet of the liquid steel pipe 9 and discharged from the outlet,
Return to the oil tank again. On the other hand, heat generated in a work support portion or a grindstone support base portion (not shown) or
The heat of the grinding fluid raised by the processing heat is transmitted to the main body through the cast steel pedestal 7 and the cast steel pedestal 8.

However, the heat transfer to the main body 6 is difficult to be performed promptly because the main body 6 is formed of concrete having a low heat transfer coefficient and a low temperature conductivity. Even if the upper part of the part 6 is to be heated, the oil in the steel pipe 9 for liquid passage near the upper surface quickly removes the heat of the concrete part 6a and carries it away to the outside. As a result, the temperature difference between the upper part and the lower part of the bed is prevented from becoming excessively large, and the temperature distribution in each part is made uniform.

The above embodiment can be modified as follows. That is, a plurality of systems are used instead of the steel pipe 9 being a single system. For example, as two systems, one system is arranged in the upper layer of the concrete part 6a, and the other system is arranged in the deep part of the concrete part 6a. Instead of the steel pipe 9, a pipe made of a vinyl chloride material (including a synthetic resin material similar thereto) is used.

[0024]

According to the present invention, since the heat transfer coefficient and the thermal conductivity of the concrete are small, it is difficult for the temperature to rise, and the specific part is cooled to a necessary degree by the steel pipe and the liquid. The temperature of the workpiece is made uniform, and excessive thermal deformation such as upward convexity and reduction in machining accuracy due to this are prevented, thereby maintaining the machining accuracy required for precision machining during machining of the machine tool. It will be.

Further, since the coefficient of thermal expansion of the steel pipe through which the liquid flows is similar to that of the concrete, even if the temperature changes, the adhesion to the concrete is not impaired. The uniformization of the temperature of each part is performed efficiently over a long period of time.

According to the second aspect, the coefficient of thermal expansion of the concrete is more similar to that of the cast steel material, whereby the connection between the cast steel receiving portion and the cast steel pedestal and the concrete is impaired by the temperature change of both. It will not be.

According to the third aspect, the heat transmitted to the upper layer of the bed is rapidly cooled by the steel pipe and the liquid present at this position, and therefore, in the machine tool provided with the machining section on the upper surface of the bed. The heat deformation of the bed, which is convex upward, is effectively prevented.

According to claims 4 to 6, the above effects can be obtained for a bed of a cylindrical grinding machine.

[Brief description of the drawings]

1 shows a bed according to an embodiment of the present invention, wherein A is a plan view, B is a left side view, and C is a right side view.

FIG. 2 shows the bed, wherein A is a front view and B is a rear view.

FIG. 3 shows the bed, wherein A is a plan view, B is a front view, and C is a right side view.

FIG. 4 shows a conventional cylindrical grinder, wherein A is a right side view and B is a front view.

[Explanation of symbols]

 6a Concrete part 9 steel pipe

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[Procedure amendment]

[Submission date] June 21, 1999 (1999.6.2
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Cylindrical grinding machine bed

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed of a cylindrical grinder made of concrete.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

However, the technology described in Japanese Patent Laid-Open No. 6-304831 concerning a concrete bed cannot effectively prevent the bed from being bent due to the above-mentioned factors. An object of the present invention is to provide a bed of a cylindrical grinding machine which can reasonably cope with such a situation.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

In order to achieve the above object, according to the present invention, a steel pipe for flowing a temperature-controlled liquid is provided in a bed of a cylindrical grinder made mostly of concrete. One system is installed in the upper layer of the concrete, and the other system is installed in the deep part of the concrete, so that heat is exchanged between the liquid in the steel pipe and the concrete.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

[0023]

According to the present invention, the heat transfer rate and the thermal conductivity of the concrete are small, so that the temperature does not easily rise. Further, two systems, one of which is disposed on the upper layer of the concrete, and the other of which is the concrete. Since the specific location is cooled to the required degree by the steel pipe and liquid, the temperature of each part of the bed is uniform and excessive thermal deformation such as convex upward A decrease in the processing accuracy due to this is prevented, whereby the processing accuracy required for precision processing is maintained during processing of the machine tool.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

Further, since the coefficient of thermal expansion of a steel pipe through which a liquid flows is similar to that of concrete, even if the temperature of the steel pipe changes, the adhesiveness to concrete is not impaired. The uniformization of the temperature of each part is performed efficiently over a long period of time.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

According to the second aspect, the coefficient of thermal expansion of the concrete is more similar to that of the cast steel material, whereby the connection between the cast steel receiving portion and the cast steel pedestal and the concrete is damaged by the temperature change of both. It will not be.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

According to the third aspect, the heat transmitted to the upper layer of the bed is rapidly cooled by the steel pipe and the liquid present at this position, and therefore, in the cylindrical grinding machine in which the working portion is provided on the upper surface of the bed. Therefore, the thermal deformation of the bed which is convex upward can be effectively prevented.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Deleted

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Deleted ───────────────────────────────────────────── ────────

[Procedure amendment]

[Submission date] June 21, 1999 (1999.6.2
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Cylindrical grinding machine bed

Claims (6)

[Claims] In a machine tool bed made mostly of concrete, a pipe made of a steel material or a vinyl chloride material for flowing a liquid whose temperature is controlled is buried in a concrete part, and a liquid in the steel pipe is formed. A machine tool bed characterized in that heat is exchanged between concrete and concrete. 2. The machine tool bed according to claim 1, wherein concrete made of a ceramic composite material is used, and oil is used as a liquid. 3. Approximately 100 m from the top of the concrete part
The machine tool bed according to claim 1, wherein the steel pipes are arranged at a pitch of 400 mm or less on a surface portion within m. 4. In a machine tool bed made mostly of concrete, a pipe made of a steel material or a vinyl chloride material for flowing a temperature-controlled liquid is buried in the concrete portion, and the liquid in the steel pipe is embedded in the bed. A bed of a cylindrical grinding machine, wherein heat is exchanged between the bed and concrete. 5. The bed of a cylindrical grinding machine according to claim 4, wherein concrete made of a ceramic composite material is used, and oil is used as a liquid. 6. Approximately 100 m from the top of the concrete part
The bed of a cylindrical grinding machine according to claim 4 or 5, wherein the steel pipes are arranged at a pitch of 400 mm or less on a surface portion within m.