JPH09117844A - Cooling method of work table of vertical lathe and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve machining precision by efficiently preventing heating of a work table by a simple device. SOLUTION: Heating is restrained by lubricating and cooling a work table 7 by oiling a central bearing 5 of a central shaft 3 provided on a bed from above to support the work table 7 freely to rotate, collecting oil and supplying it to a groove 61 provided on an upper surface of a table receiver 9 with oil for cooling for the table receiver 9 provided to support a lower surface of the work table 7. At this time, oil for the central bearing 5 supplied from a fixed side and cooling oil for the table receiver 9 are once collected to an oil pan 41 integrally rotating with the work table 7 and it is delivered to the groove 61 above the table receiver 9 by its centrifugal force. As oil supplied to the groove 61 is discharged from a discharge port on a different phase from an oil supply port, oil flows in the inside of the groove 61, while it removes heat generated on the table receiver 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cooling a work table of a vertical lathe and a device therefor, and more particularly to a method of cooling a work table of a vertical lathe for preventing heat generation of the work table which adversely affects machining accuracy. And its device.

[0002]

2. Description of the Related Art Conventionally, there is a vertical lathe 101 as shown in FIG. In FIG. 4, a column 105 is vertically provided on the rear side of the upper surface of the bed 103, and a work table 107 for mounting and rotating a work W, which is a heavy object, is provided near the front left side of the column 105. There is.

On the other hand, the column 105 is provided with a plurality of guide rails 109 in the vertical direction, and an arm 111 that moves up and down along the guide rails 109 is provided. A ball screw (not shown) for moving the arm 111 up and down is provided along the column 105, and the arm 111 is provided with a ball nut screwed to the ball screw.

A guide 113 extending in the horizontal direction is provided on the arm 111, and a saddle 117 having a slider 115 movable along the guide 113 is provided. This saddle 117 has a tool T at the tip.
A ram 119 mounted with is mounted so as to be vertically movable.

Therefore, the work W is placed on the work table 107 and rotated, and the arm 111 moves in the Z-axis direction (vertical movement in the drawing) and the saddle 117 reciprocates in the X-axis direction (horizontal direction in the drawing). Is positioned with respect to the work W, the ram 119 is lowered, and cutting is performed with the tool T.

[0006] Referring to FIG. 5, the work table 1
As a bearing of No. 07, a center bearing 123 that rotatably supports a center shaft 121 fixed to the center and a table receiver 125 that supports a heavy object on the lower surface of the work table 107 are provided.

In such a structure, since the work table 107 carries the work W, which is a heavy object, and rotates at a high speed, the heat generated in the central bearing 123 and the table receiver 125 cannot be ignored in terms of processing accuracy. Is generally known.

Therefore, as shown in FIG. 5, the oil pipe 127 is conventionally provided in the center bearing 123 and the table receiver 125.
The lubricating oil is supplied by the above method, and the recovered lubricating oil is temperature-controlled by an oil cooler or the like to be supplied again.

[0009]

However, in such a conventional technique, it is not possible to sufficiently prevent the heat generation of the table receiver 125 and the like simply by controlling the temperature of the lubricating oil with an oil cooler or the like. There is. For this reason, there is a problem that the heat generated in the table receiver 125 and the like cannot be sufficiently removed, resulting in a reduction in processing accuracy.

The object of the present invention has been made by paying attention to the above-mentioned conventional techniques, and it is possible to improve the processing accuracy by effectively preventing the heat generation of the work table by a simple device. A method and apparatus for cooling a work table of a vertical lathe.

[0011]

In order to achieve the above object, a method of cooling a work table of a vertical lathe according to a first aspect of the present invention is such that a work table on which a work is placed is rotatably supported on a pedestal. A work table of a vertical lathe having a center bearing provided on an upright center shaft and a table receiver provided between a pedestal for rotatably supporting a lower surface of the work table. Oil is lubricated from above to lubricate and cool it, and the cooling oil supplied separately from the recovered oil from the central bearing and the lubricating oil for the table bearing is once received by an oil pan rotating with the work table. The centrifugal force generated by the rotation of the tray is supplied to the groove provided on the lower surface of the work table that is in close contact with the upper surface of the table receiver.

Therefore, the oil injected from above the central bearing serves as a cooling action as well as a lubricating action while dropping, so that the heat generated in the central bearing due to the rotation of the work table is removed. Also, the cooling oil for the table receiver, which is supplied separately from the oil and lubricating oil that has been lubricated to the center bearing, is once collected in the oil pan that rotates together with the work table, and the table is rotated by the centrifugal force generated by the rotation of the oil pan. The heat is supplied to the groove provided on the lower surface of the work table that is in close contact with the upper surface of the receiving tray to suppress heat generation of the table receiving tray.

According to a second aspect of the present invention, there is provided a method for cooling a work table of a vertical lathe, wherein the oil supplied from the oil pan to the groove is discharged in a phase different from the position at which the oil is supplied. It is characterized by.

Therefore, the oil supplied to the groove is discharged from the discharge port having a phase different from that of the oil supply port, so that the oil flows inside the groove and the heat generated in the table receiver is removed during that time. To do.

According to a third aspect of the present invention, there is provided a work table cooling device for a vertical lathe, comprising: a central bearing provided on a central shaft erected on a cradle to rotatably support a work table on which a work is placed; A work table of a vertical lathe having a table receiver provided between a table and a pedestal for rotatably supporting the lower surface of the table, wherein an oil passage for supplying lubricating oil from above to the central bearing and an oil passage The oil receiving tray that is integrally provided on the lower surface of the work table to collect the oil that has been supplied to lubricate and cool the central bearing and to receive the cooling oil that is supplied from the central shaft is in close contact with the upper surface of the table receiving member. And a cooling oil passage provided on the lower surface of the work table for feeding oil from the oil pan to the groove. It is an.

Therefore, the oil supplied from the oil passage is recovered by lubricating the central bearing from above and simultaneously cooling it. The collected oil is once collected in the oil pan together with the cooling oil supplied separately from the table receiving lubricating oil. Since the oil pan rotates integrally with the work table, the oil is sent by the centrifugal force through the cooling oil passage to the groove provided on the lower surface of the work table at the table receiving position to cool the table receiver.

A cooling device for a work table of a vertical lathe according to a fourth aspect of the present invention is characterized in that the groove according to the third aspect is provided on the entire circumference of the lower surface of the work table.

Therefore, the cooling oil supplied through the cooling oil passage is injected into the groove provided on the lower surface of the work table that is in close contact with the upper surface of the table receiving portion, and can flow over the entire circumference.

According to a fifth aspect of the present invention, there is provided a cooling device for a work table of a vertical lathe, wherein in the groove according to the third and fourth aspects, an oil supply port for supplying oil from the cooling oil passage and an exhaust port for discharging the oil supplied. Are provided at different phases and on the outer peripheral side.

Therefore, the cooling oil supplied from the oil supply port to the groove flows along the groove to the discharge port and removes the heat generated in the table receiver during this period. Then, it is discharged to the outside from the discharge port by centrifugal force.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Since the general structure of the vertical lathe has been already described in the prior art, detailed description thereof will be omitted.

Referring to FIG. 1, a central shaft 3 is fixed on a bed 1, and a circular work table 7 is rotatably provided on the central shaft 3 via a bearing central bearing 5. There is. In addition, a bearing table receiver 9 is provided in the middle portion of the lower surface of the work table 7 over the entire circumference, and the work table 7 is rotatably supported from the lower surface, and when the work W as a heavy object is placed, 7 can be sufficiently supported so as not to be deformed. A ring-shaped gear 11 centered on the central shaft 3 is attached to the lower surface of the work table 7 outside the bearing table receiver 9 with bolts 13.

On the other hand, on the left side of the work table 7 on the bed 1 in the figure, a drive motor 17 with the drive shaft 15 facing downward is provided.
9 is attached.

The drive motor 1 inside the bed 1
A first shaft 21 extending in the vertical direction is rotatably provided at the right side position in FIG.
An idle gear 23 meshing with the drive gear 19 is provided near the upper end of the first gear 1 so as to rotate integrally with the first shaft 21. In the vicinity of the lower end of the first shaft 21, the idle gear 2 having two different upper and lower teeth.
5 is vertically movable and is provided so as to rotate integrally with the first shaft 21.

A second shaft 27 extending vertically is rotatably provided on the right side of the first shaft 21 in the figure. The second shaft 27 is provided with an idle gear 29 having two different upper and lower teeth.
It is provided so as to rotate integrally with. Therefore, the idle gear 25 provided on the aforementioned first shaft 21
By moving up and down, it meshes with the idle gear 29 of the second shaft 27 at a different reduction ratio.

A third shaft 31 extending in the vertical direction is rotatably provided on the right side of the second shaft 27 in the drawing. An idle gear 33 that meshes with the upper teeth 29A of the idle gear 29 attached to the second shaft 27 is attached near the lower end of the third shaft 31. A gear 35 that meshes with the ring-shaped gear 11 provided on the lower surface of the work table 7 is attached to the upper end of the third shaft 31.

Therefore, the first shaft 21 is rotated by the rotational drive of the drive motor 17, and the second shaft 2 is further rotated.
7, the work table 7 is rotationally driven by rotating the third shaft 31.

On the other hand, at the center of the central shaft 3, an oil feed pipe 37 for feeding oil from a hydraulic pump (not shown) is provided. An oil pipe 39 is provided at the upper end of the oil feed pipe 37 toward the outer peripheral direction of the central shaft 3, and the tip thereof is opened on the outer peripheral surface of the central shaft 3. As a result, the sent oil is poured into the bearing center bearing 5, lubricated and cooled, and collected in an oil pan 41 described later.

An oil pipe 43 provided near the lower end of the central shaft 3 from the oil feed pipe 37 toward the outer peripheral direction of the central shaft 3 is fixed to the bed 1 and extends to the bearing table receiver 9. It is connected to 45. The oil supplied by the oil pipe 47 lubricates the bearing table receiver 9 and is cooled and collected to be temperature-controlled by an oil cooler (not shown).

The oil pipe 43 in the middle of the oil feed pipe 37
Between the oil pipe 45 and the oil pipe 45, a cooling oil pipe 47 is provided in the outer peripheral direction of the central shaft 3, and its tip projects outward from the outer peripheral surface of the central shaft 3.

At the lower position of the tip of the cooling oil pipe 47 on the lower surface of the work table 7, the above-mentioned disc-shaped oil receiving tray 41 which rotates integrally with the work table 7 is attached.

Referring to FIG. 2 together, the oil pan 4
1 has a doughnut-like shape made of a thin plate, and has an inner wall 49 extending along the inner edge over the entire circumference. Further, the outer peripheral edge has a wide outer wall 51 extending over the entire circumference. Therefore, the oil pan 41 has the oil sump 53 over the entire circumference, and the recovered oil that lubricates and cools the central bearing 5 while rotating with the work table 7 and the cooling oil supplied from the tip of the cooling oil pipe 47. It receives the oil of.

The space 55 provided inside the inner wall 49 has a circular shape having a diameter slightly larger than the outer diameter of the central shaft 3, and is for avoiding interference with the central shaft 3. is there.

The outer wall 51 is provided with a plurality of (four in FIG. 2A) penetrating passages 57 penetrating the outer wall 51 in the radial direction, and the work table 7 is provided at the exit of the penetrating passage 57. A rotating cooling oil pipe 59 (see FIG. 1) is connected. The cooling oil pipe 59 is fixed to the lower surface of the work table 7 and extends above the bearing table receiver 9.

On the other hand, referring to FIG. 3, a groove 61 is provided over the entire circumference on the lower surface of the work table 7 which is in close contact with the upper surface of the bearing table receiver 9 on the lower surface of the work table 7. 59 is this groove 6
It is connected to one fuel supply port 63 (here, four). Further, the groove 61 is provided with a discharge port 65 that is open to the outside at an intermediate position of the plurality of fuel filler ports 63.

Therefore, the oil pan 41 is used as the work table 7.
By rotating integrally with the oil reservoir 53, the cooling oil that has dropped into the oil sump 53 is sent to the cooling oil pipe 59 from the through passage 57 by a centrifugal force and is provided above the bearing table receiver 9. The oil is sent from the fuel filler 63 to the groove 61.

The sent cooling oil flows inside the groove 61 and is discharged from the discharge port 65 by centrifugal force. When the cooling oil flows inside the groove 61 and flows down along the bearing table receiver 9, the generated heat is effectively removed to cool the bearing table receiver 9. The cooling oil that has cooled the bearing table receiver 9 and the like falls and is collected together with the lubricating oil and is temperature-controlled by an oil cooler or the like (not shown).

As described above, the central bearing 5 is lubricated.
A part of the cooled recovered oil and the oil sent by the hydraulic pump (not shown) falls from the cooling oil pipe 47 and is supplied to the oil sump 53 of the oil pan 41 that rotates integrally with the work table 7. . The oil temporarily stored in the oil sump 53 passes through the through passage 57, the cooling oil pipe 59, and the groove 6 above the bearing table receiver 9 by the centrifugal force of the oil receiving tray 41.
It is possible to remove the heat generated in the bearing table receiver 9 while flowing through the groove 61, which is supplied to No. 1, and to effectively cool the bearing table receiver 9.

As a result, it is possible to suppress the thermal influence on other parts, and to avoid the thermal deformation that causes the deterioration of the processing accuracy. Although not described in detail, it has been confirmed by experiments that, for example, the floating amount of the outer circumference of the work table 7 due to thermal deformation can be suppressed to one-fifth as compared with the case of the conventional cooling method.

The present invention is not limited to the above-described embodiment, but can be implemented in other modes by making appropriate changes. For example, in the above-described embodiment, the common circuit up to the central shaft 3 is used as the circuit for the lubricating oil and the cooling oil, but it may be guided by another circuit.

Further, the size of the through passage 57 of the oil pan 41, the sizes of the cooling oil pipes 47 and 59, the amount of supplied oil, and the like in the above-described embodiment are calculated so as to maximize the cooling efficiency. It is decided by experiment.

Further, although the groove 61 is provided on the lower surface of the work table 7 in the above-described embodiment, it may be provided on the rotation side of the bearing table receiver 9.

[0044]

As described above, in the cooling method for the work table of the vertical lathe according to the first aspect of the present invention, the oil injected from above the central bearing fulfills the cooling action simultaneously with the lubricating action while falling. The heat generated in the central bearing can be removed by rotating the work table. Also, the cooling oil for the table receiver, which is supplied separately from the oil and lubricating oil that has been lubricated to the center bearing, is once collected in the oil pan that rotates together with the work table, and the table is rotated by the centrifugal force generated by the rotation of the oil pan. Since it is supplied to the groove provided on the lower surface of the work table that is in close contact with the upper surface of the receiving table, heat generation of the table receiving section can be effectively suppressed, and the machining accuracy of the vertical lathe can be improved.

In the method for cooling the work table of the vertical lathe according to the second aspect of the present invention, the oil supplied to the groove is discharged from the discharge port having a phase different from that of the oil supply port, so that the oil flows inside the groove. Therefore, the heat generated in the table holder during that time can be effectively removed.

In the cooling device for the work table of the vertical lathe according to the third aspect of the present invention, the oil supplied from the oil passage lubricates the central bearing from above and at the same time cools it, so that heat generation by the central bearing can be suppressed. Further, this oil is collected and once collected in the oil pan together with the cooling oil supplied separately from the lubricating oil for receiving the table. Therefore, the oil supplied from the fixed side is sent to the rotating side by a simple structure. Can be oiled. The oil pan rotates together with the work table, and the centrifugal force of the oil pan sends oil through the cooling oil passage to the groove provided on the lower surface of the work table that is in close contact with the upper surface of the table. The device is not required, the structure can be simplified, and at the same time, the heat generated by the table receiver can be suppressed. As a result, the processing accuracy of the vertical lathe can be improved.

In the work table cooling device of the vertical lathe according to the fourth aspect of the present invention, the cooling oil supplied through the cooling oil passage is injected into the groove provided on the lower surface of the work table which is in close contact with the upper surface of the table. Since it can flow in the groove over the entire circumference, heat generated in the table receiver during that time can be effectively removed.

In the cooling device for a work table of a vertical lathe according to a fifth aspect of the present invention, since the oil supply port and the discharge port provided in the groove are deviated from each other, the cooling oil flows in the groove and is discharged by the centrifugal force. Is discharged from the outside. During this time, the heat generated in the table receiver can be effectively removed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cooling device for a work table of a vertical lathe according to the present invention.

FIG. 2 is a plan view and a cross-sectional view showing the shape of an oil pan.

FIG. 3 is a bottom view showing the shape of a groove formed on the lower surface of the work table.

FIG. 4 is a front view showing a general vertical lathe.

FIG. 5 is a cross-sectional view showing a conventional work table cooling device for a vertical lathe.

[Explanation of symbols]

 1 bed 3 center shaft 5 center bearing 7 work table 9 table receiver 41 oil pan 43, 45 oil pipe (oil passage) 47, 59 cooling oil pipe (cooling oil passage) 61 groove 63 oil supply port 65 discharge port

Claims (5)

[Claims] 1. A center bearing provided on a center shaft erected on a pedestal to rotatably support a work table on which a work is placed, and a gantry to rotatably support a lower surface of the work table. A work table of a vertical lathe having a table bearing provided, wherein the central bearing is lubricated by lubricating it from above to cool it, and the collected oil from the central bearing and the lubricating oil for the table bearing are separately provided. The cooling oil supplied is temporarily received by an oil pan that rotates together with the work table, and is supplied to a groove provided on the lower surface of the work table that is in close contact with the upper surface of the table pan by the centrifugal force generated by the rotation of the oil pan. The characteristic method of cooling the work table of the vertical lathe. 2. The method for cooling a work table of a vertical lathe according to claim 1, wherein the oil supplied from the oil receiving tray to the groove is discharged in a phase different from the supplied position. 3. A center bearing provided on a center shaft erected on a pedestal to rotatably support a work table on which a work is placed, and a gantry to rotatably support a lower surface of the work table. A work table of a vertical lathe having a table receiver provided, wherein an oil passage for supplying lubricating oil from above to the central bearing and oil supplied by this oil for lubricating and cooling the central bearing are collected. And an oil pan integrally provided on the lower surface of the work table to receive cooling oil supplied from the central shaft, a groove provided on the lower surface of the work table that is in close contact with the upper surface of the table receiver, and the oil. A cooling device for a work table of a vertical lathe, comprising: a cooling oil passage provided on a lower surface of the work table for feeding oil from a tray to the groove. 4. The work table cooling device for a vertical lathe according to claim 3, wherein the groove is provided all around the lower surface of the work table. 5. In the groove, an oil supply port for supplying oil from the cooling oil passage and a discharge port for discharging the supplied oil are provided at different phases and on the outer peripheral side. The cooling device for the work table of the vertical lathe described in 3 and 4.