JP2015213966A - Spindle base cooling tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool which suppresses influence of heat from a spindle part and is cooled with a simple structure.SOLUTION: A spindle base cooling tank 10 is installed in a spindle base of a bed body and includes a coolant inlet 20 and a coolant outlet 30 for circulating a coolant. The spindle base cooling tank 10 includes: a division plate 40 for dividing an interior part of the spindle base cooling tank 10; and a penetration part 50 for passing the coolant through the division plate 40.

Description

  The present invention relates to an internal structure of a spindle seat cooling tank. More specifically, the present invention relates to an internal structure of a spindle pedestal cooling tank that can be installed in a spindle pedestal or the like of a bed body of a machine tool and can enhance the cooling effect by controlling the behavior of a coolant flowing in the cooling tank.

  An NC lathe, which is one of machine tools, has a bed main body installed on a floor surface, and a main spindle is provided on the bed main body. The main shaft is provided with a main shaft that is rotated by a motor. In an NC lathe, due to high rotation of the spindle motor during machining, the motor and the bearing part inside the spindle generate heat, and the heat generated in the spindle part is conducted to the bed body. Since the heat generated in the main shaft portion is conducted to the bed main body, the bed main body is thermally deformed to cause a dimensional change, which makes it difficult to obtain a stable processing accuracy.

  In order to suppress thermal deformation of the bed main body due to heat generation during processing, a machine tool in which a cooling tank is installed inside the bed main body is known (Patent Document 1). That is, “a coolant reservoir provided in the bed body, a circulation pump for circulating the coolant in the coolant reservoir, and first and second cooler means for cooling the coolant, The cooling liquid that has cooled the one main shaft portion is returned to the second main shaft portion side portion of the cooling liquid reservoir portion, and the cooling liquid that has cooled the second main shaft portion is returned to the first main shaft portion portion of the cooling liquid reservoir portion. A machine tool characterized by being returned (patent document 1: extracted from claim 1) is known.

JP2008-279531

  However, as in Patent Document 1, the cooling effect is insufficient by simply circulating the coolant while circulating it. Therefore, in order to cool the coolant, an oil controller (a device that is installed separately from the machine tool and cools the coolant itself) is used in combination. If the oil controller is used, the effect of cooling the cooling liquid is high, but there is a problem that the installation area and the power consumption increase, and if possible, we wanted to avoid the use.

  As a result of intensive research, the inventors have found that when the flow of water flowing straightly curves, a phenomenon occurs in which the outer flow velocity increases and the inner flow velocity decreases. In order to effectively cool the part to be cooled (the wall side of the cooling tank) without changing the liquid flow rate, the coolant flow path in the cooling tank is intentionally bent and near the wall of the cooling tank. It has been found that this can be achieved by increasing the flow velocity of the material (the cooling rate of the part away from the wall is reduced accordingly). That is, the inventors have focused on the cooling effect by controlling the behavior of the coolant flowing in the cooling tank, and have reached the present invention.

  The purpose of the present invention is to pay attention to the flow of the cooling liquid in the cooling tank installed inside the spindle pedestal of the bed main body, and to control the behavior of the cooling liquid, so that the wall of the cooling tank installed inside the bed main body is effective. It is intended to provide a spindle pedestal cooling tank that can eliminate the influence of heat from the main shaft portion to the bed main body and suppress thermal deformation of the bed main body itself by cooling the main body.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present application is installed in the main spindle base of the bed body, and the main spindle base is provided with a cooling liquid inlet and a cooling liquid outlet for circulating the cooling liquid. A cooling tank, characterized in that it is a spindle pedestal cooling tank provided with a partition plate for partitioning the inside of the spindle pedestal cooling tank and a through portion for allowing a coolant to pass through the partition plate. It is.

  In order to solve the above-mentioned problem, the invention described in claim 2 of the present application is installed in the main spindle base of the bed body, and the main spindle base is provided with a cooling liquid inlet and a cooling liquid outlet for circulating the cooling liquid. A spindle pedestal cooling tank comprising: a plurality of partition plates for partitioning the interior of the spindle pedestal cooling tank; and a through portion for allowing a coolant to pass through each of the plurality of partition plates. It is characterized by being.

  In order to solve the above-mentioned problem, the invention described in claim 3 of the present application is the invention described in claim 2, wherein a cross-sectional area of the through portion is along the flow of the coolant from the coolant inlet side. The spindle pedestal cooling tank becomes smaller as it goes to the coolant outlet side.

  According to the spindle pedestal cooling tank of claim 1 of the present invention, the partition plate for partitioning the inside of the spindle pedestal cooling tank and the through-hole for allowing the coolant to pass through the partition plate are used for cooling. The cooling liquid supplied from the liquid inlet to the cooling tank passes through the through portion provided in the partition plate, and is discharged from the cooling liquid outlet to the outside of the cooling tank. At this time, the flow of the coolant flows from the coolant inlet toward the wall surface opposite to the wall where the coolant inlet is installed, and is bent to enter the penetration portion. The flow returns to the installed wall.

  In other words, since the flow path of the coolant near the wall opposite to the wall where the coolant inlet is installed is curved, the flow velocity on the wall surface of the cooling tank increases, and the wall of the cooling tank is cooled. It becomes easy. Furthermore, by installing the penetration part, the part adjacent to the penetration part of the partition plate closer to the wall surface than the penetration part acts as a rib installed on the wall surface in the cooling tank, generating turbulent flow near the wall surface, There is also an effect of increasing the flow velocity on the side. The flow path and flow velocity of the cooling liquid in the cooling tank can be controlled only by installing the partition plate and the through-hole in the partition plate. According to the present invention, a higher cooling effect can be obtained by slightly devising the structure inside the cooling tank provided on the bed spindle base. As a result, by installing the spindle pedestal cooling tank according to the present invention inside the bed main body, it is possible to prevent the heat generated from the main spindle portion from being conducted to the entire bed main body.

  According to the spindle pedestal cooling tank according to claim 2 of the present invention, a plurality of partition plates for partitioning the inside of the spindle pedestal cooling tank, and a through portion for allowing the coolant to pass through each of the plurality of partition plates Therefore, the flow of the coolant can be brought close to a spiral shape along the wall surface of the spindle seat cooling tank. Ideally, the flow of the coolant in the spindle pedestal cooling tank is spiraled along the wall surface of the spindle pedestal cooling tank in the image as shown in FIG. Thus, it is considered that the cooling effect on the wall surface side of the spindle pedestal cooling tank is improved.

  According to the spindle pedestal cooling tank according to claim 3 of the present invention, the cross-sectional area of the penetrating portion becomes smaller along the flow of the coolant from the coolant inlet side toward the coolant outlet side. Every time it passes through the section, the flow velocity becomes faster. The faster the flow rate, the better the cooling effect, and the more effective the cooling.

It is a whole figure (claim 1) of a spindle pedestal cooling tank. It is a top view for demonstrating the whole figure (Claim 2) of a spindle pedestal cooling tank, and the behavior of a cooling fluid. It is a figure explaining the basic cooling principle of a spindle pedestal cooling tank. It is a figure showing the use condition of a spindle pedestal cooling tank. It is an example of a change of a spindle seat cooling tank.

<Structure of spindle pedestal cooling tank>
Hereinafter, the spindle seat cooling tank 10 according to the present invention will be described in detail with reference to FIGS. FIG. 1 is an overall view of a spindle pedestal cooling tank 10 (Claim 1). It is a basic shape of the spindle pedestal cooling tank 10 according to the present invention. The coolant sent from the circulation pump is supplied to the spindle pedestal cooling tank 10 from the coolant inlet 20, passes through the through portion 50 installed in the partition plate 40, is discharged from the coolant outlet 30, and is supplied to the circulation pump. It comes to return.

  The penetrating portion 50, which is a feature of the present invention, is installed so as to be close to the surface side of the partition plate 40 to be cooled (that is, the wall surface side of the spindle seat cooling tank 10). In detail, it is located near the wall surface of the spindle pedestal cooling tank 10 (close to the wall surface of the spindle pedestal cooling tank 10 (distance from the wall surface to the penetrating portion 50: 10 mm to 30 mm). Is a rectangular parallelepiped having a width of 240 mm × depth of 160 mm × height of 260 mm, but is not limited to a rectangular parallelepiped shape, and a part thereof may be a cylindrical shape.

  FIG. 2 is an overall view of the spindle pedestal cooling tank 10 (Claim 2) and a top view for explaining the behavior of the coolant. The partition plate 40 installed in the spindle pedestal cooling tank 10 can adopt various variations according to the location to be cooled. However, as shown in FIG. A partition plate 40 for partitioning, a partition plate 40 for partitioning the interior of the spindle pedestal cooling tank 10 to the left and right (the coolant inlet 20 side is the right side), and the interior of the spindle pedestal cooling tank 10 are front and rear (coolant inlet) It can be set as the partition plate 40 for partitioning into the front side 20 side.

  Each partition plate 40 is provided with a through portion 50 for allowing the coolant to pass therethrough. Each penetrating part 50 is located near the wall surface of the spindle pedestal cooling tank 10 (close to the wall surface of the spindle pedestal cooling tank 10 (distance from the wall surface to the penetrating part 50: 10 mm to 30 mm): The cross-sectional area is set within one half of the area of the wall that partitions each compartment, and the length (height) of the penetrating part is 50% to 80% of the partition plate 40). ing.

  The coolant sent from the circulation pump is supplied from the coolant inlet 20 to the spindle seat cooling tank 10. The coolant supplied from the coolant inlet 20 to the spindle pedestal cooling tank 10 passes through the through portions 50 installed in the respective partition plates 40, and as shown in FIG. 2, A → B → C → D → E → F → G → H (A, B, C, and D are lower layers, E, F, G, and H are upper layers) are passed through the spindle pedestal cooling tank 10 and discharged from the coolant outlet 30. Go back to the circulation pump. As described in FIG. 2, the coolant flows spirally in the spindle pedestal cooling tank 10 (as described in the top view of FIG. 2). By dividing the spindle pedestal cooling tank 10 up and down, front and rear, left and right (8 sections), by installing the penetrating part 50 in the partition plate 40 of each of the 8 sections, so that the coolant passes through all 8 sections, The coolant flows spirally in the spindle pedestal cooling tank 10, and the coolant flows through the penetrating portion 50 that also acts as a rib, whereby the flow near the wall surface can be turbulent and the flow velocity can be increased.

  The cross-sectional area of the penetrating portion 50 increases from the coolant inlet 20 side to the coolant outlet 30 side along the flow of the coolant (flowing in the order of A → B → C → D → E → F → G → H). Although the length (height) of the penetrating portion 50 is small, the portion adjacent to the penetrating portion 40 of the partition plate 40 on the wall surface side with respect to the penetrating portion 50 is the main shaft base. In order to make it easy to obtain the effect as a rib installed in the cooling tank 10, the cross-sectional area of the through portion 50 is reduced from the coolant inlet 20 side by reducing the width of the through portion 50 at a constant width. (A → B → C → D → E → F → G → H).

<Basic cooling principle of spindle pedestal cooling tank>
FIG. 3 is a view for explaining the basic cooling principle of the spindle seat cooling tank 10 according to the present invention. The point of the present invention is to control the behavior (passage path and flow velocity) of the cooling liquid in the cooling tank, that is, to make the flow of the cooling liquid spiral along the wall surface of the spindle seat cooling tank 10 as much as possible. Thus, the flow rate of the coolant flowing in the vicinity of the wall surface is increased, thereby improving the cooling effect of the wall surface.

  As shown in FIG. 3 (a), when the flow path of the coolant is straight, the flow rate of the coolant flows at the same speed in the flow path (although it is different near the wall surface, this point will be described later). Describe). It is known that when the flow path is curved as shown in FIG. 3B, the flow velocity on the larger diameter side becomes faster. By increasing the flow rate of the coolant on the wall surface side, the heat exchange rate with the wall surface is improved, and a higher cooling effect can be obtained. Utilizing this principle, the cooling effect is improved by using the wall surface on the larger diameter side as the cooling surface.

  FIG.3 (c) is a figure which shows the flow velocity distribution near a wall surface. It is known that the flow of water or the like is roughly divided into a laminar flow and a turbulent flow, and the turbulent flow has a higher flow velocity near the wall surface than the laminar flow. Since turbulent flow is less affected by friction from the wall surface and has a higher flow velocity than laminar flow, it is considered that the heat exchange rate at the wall surface is improved when the flow near the wall surface is made turbulent. Using this principle, ribs on the wall surface of the flow path (in the present invention, the portion adjacent to the through portion 50 of the partition plate 40 closer to the wall surface than the through portion 50 is a rib installed in the spindle pedestal cooling tank 10. 3) is provided as shown in FIG. 3D, the flow of the cooling liquid in the vicinity of the wall surface can be turbulent and the wall surface cooling effect can be improved.

  FIG. 3E shows a combination of these principles. It is conceivable that the flow rate of the coolant near the wall surface is curved, and ribs are provided on the wall surface, whereby the flow velocity is further increased and the flow is turbulent to further improve the cooling effect.

  FIG. 3 (f) shows an image diagram of a preferable flow of the cooling liquid in the cooling tank. Ideally, as shown in FIG. 3F, the flow of the cooling liquid in the cooling tank is made spiral, so that the flow velocity on the wall surface side of the cooling tank is increased and the cooling effect is improved. Moreover, since the flow not only on the wall surface but also on the upper surface side (main shaft grounding surface) of the cooling tank becomes faster, it is considered that a further cooling effect can be obtained.

<Use condition of spindle pedestal cooling tank>
FIG. 4 is a diagram illustrating a use state of the spindle seat cooling tank 10. As described in FIG. 4, the bed main body is installed on the floor surface, and the main shaft portion is provided on the bed main body. The main shaft is provided with a main shaft that is rotated by a motor. Machine tool bodies such as NC lathes generally have a cooling tank integrated with a spindle pedestal inside a pedestal portion to which a spindle of a cast iron bed is attached. As shown in FIG. 4, the spindle pedestal cooling tank 10 according to the present invention is installed immediately below each spindle, which is a position where the influence of heat is likely to occur. Depending on the type of machine tool, two spindles are mounted side by side, and two cooling tanks may be installed side by side in one bed.

  The coolant sent from the circulation pump is supplied from the coolant inlet 20 to the spindle pedestal cooling tank 10 installed inside the pedestal to which the spindle of the cast iron bed is attached. The coolant supplied from the coolant inlet 20 to the spindle pedestal cooling tank 10 passes through the through portions 50 installed in the respective partition plates 40. The cooling liquid passes through the spindle pedestal cooling tank 10 while cooling the pedestal to which the spindle of the cast iron bed is attached by heat exchange with the wall surface of the spindle pedestal cooling tank 10 (the pedestal to which the bed spindle is attached). It is discharged from the liquid outlet 30 and returns to the circulation pump.

<Effect of spindle pedestal cooling tank>
The present invention provides a cooling tank inside the bed spindle pedestal as a countermeasure against thermal deformation of the machine tool, and cools the bed spindle pedestal by circulating it while intentionally controlling the flow path and flow rate of the coolant. is there. When circulating the coolant in the spindle pedestal cooling tank 10, the partition plate 40 and the penetrating part 50 are installed so that the flow of the cooling liquid spirals along the wall surface of the spindle pedestal cooling tank 10, and cooling is performed. By making the flow of the liquid spiral along the wall surface of the spindle pedestal cooling tank 10 from the lower side to the upper side, the flow velocity on the wall surface side is increased and the cooling effect is improved.

  A spindle pedestal cooling tank 10 according to the present invention is a spindle pedestal cooling tank 10 installed inside a spindle pedestal of a bed body of a machine tool, and a partition plate 40 (partition plate 40 for partitioning the interior of the spindle pedestal cooling tank 10). The number of sheets can be arbitrarily selected) and a through portion 50 for allowing the coolant installed in the partition plate 40 to pass through (the through portion 50 is installed in each section partitioned by the partition plate 40 in the spindle seat cooling tank 10) It has.

  By installing the penetrating part 50, the part adjacent to the penetrating part 40 of the partition plate 40 on the wall surface side from the penetrating part 50 also acts as a rib installed in the spindle pedestal cooling tank 10, and near the wall surface of the coolant. The wall cooling effect can be improved by positively turbulent flow. Further, the cross-sectional area of the penetrating portion 50 is installed so as to decrease from the coolant inlet 20 side along the coolant flow toward the coolant outlet 30 side. Therefore, since the flow rate increases each time the through-portion 50 is passed, the upper portion of the wall surface of the spindle pedestal cooling tank 10 close to the main spindle that generates heat and the amount of heat generated is larger and the cooling is necessary, and the spindle pedestal cooling tank 10 The cooling effect on the upper surface side is preferentially improved.

  With the spindle pedestal cooling tank 10 according to the present invention, an effect of preventing the heat of the generated spindle from being transmitted to the entire bed can be obtained. In particular, the partition plate 40, the penetrating portion 50, and the like are designed so that the curved diameter of the flow is increased on the wall surface side of the spindle motor that is a heating element and the mounting surface of the spindle. As described above, the cooling effect can be improved by only slightly devising the cooling liquid inlet 20, the cooling liquid outlet 30 and the internal structure of the spindle pedestal cooling tank 10 of the spindle pedestal cooling tank 10 provided on the bed spindle pedestal.

<Example of change of spindle pedestal cooling tank vortex>
The configuration of the spindle pedestal cooling tank 10 according to the present invention is not limited to the aspect of the above-described embodiment, and the configuration of the coolant inlet 20, the coolant outlet 30, the partition plate 40, the penetrating portion 50, etc. The present invention can be changed as needed without departing from the spirit of the invention. For example, the spindle pedestal cooling tank 10 may have a three-layer structure of an upper stage, a middle stage, and a lower stage, and a plurality of cooling liquid inlets 20 and cooling liquid outlets 30 may be provided for each of the upper, middle, and lower stages. .

  FIG. 5 is a modified example of the spindle pedestal cooling tank 10. An image of a preferable flow of the coolant in the spindle pedestal cooling tank 10 is that the flow of the coolant in the spindle pedestal cooling tank 10 is spiral as shown in FIG. Therefore, as shown in FIG. 5, a mechanism may be employed in which a spiral column is installed in the spindle pedestal cooling tank 10 and the spiral column is further rotated inside the installed spindle pedestal cooling tank 10. . Furthermore, a mechanism may be used in which a screw is installed in the spindle pedestal cooling tank 10 and the flow in the spindle pedestal cooling tank 10 is spiraled by rotating the screw.

  Since the spindle pedestal cooling tank according to the present invention has excellent effects as described above, it is preferably used in the field related to the spindle pedestal cooling tank for effectively cooling the bed body of a machine tool such as an NC lathe. Can be used. Furthermore, even if it is a field other than the spindle pedestal cooling tank for effectively cooling the bed body of a machine tool such as an NC lathe, a cooling tank for effectively cooling a portion requiring cooling. Can also be suitably used.

10. Spindle pedestal cooling bath 20. Coolant inlet 30 ... Coolant outlet 40 ... Partition 50 ... Penetrating part

Claims (3)

A spindle pedestal cooling tank that is installed inside the spindle pedestal of the bed body and has a cooling liquid inlet and a cooling liquid outlet for circulating the cooling liquid,
A partition plate for partitioning the inside of the spindle pedestal cooling tank;
A spindle pedestal cooling tank, comprising: a penetrating portion for allowing the coolant to pass through the partition plate. A spindle pedestal cooling tank that is installed inside the spindle pedestal of the bed body and has a cooling liquid inlet and a cooling liquid outlet for circulating the cooling liquid,
A plurality of partition plates for partitioning the inside of the spindle pedestal cooling tank;
A spindle pedestal cooling tank, comprising: a through portion for allowing a coolant to pass through each of the plurality of partition plates.   The spindle pedestal cooling tank according to claim 2, wherein a cross-sectional area of the penetrating portion decreases from the coolant inlet side along the flow of the coolant toward the coolant outlet side.

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