TW201501855A - Machine tool temperature control system - Google Patents

Abstract

Disclosed is a machine tool temperature control system, applicable to a machine tool body with a hydrostatic turn table. The hydrostatic turn table is equipped with a rotating disc on the top. The temperature control system comprises a first circulating cooling pipeline, and the first circulating cooling pipeline passes into the inside of the machine tool body and comprises a plurality of oil injection holes located at the bottom of the rotating disc. The oil injection holes are distributed on at least two circumferences of different radiuses with the rotation axis of the rotating disc as the circle center. The distribution locations of the aforesaid oil injection holes enables the friction-generated heat to smoothly follow the flow of the oil film and hence get dispersed, thereby to prevent the uneven temperature problem caused by the highly concentrated heat.

Description

Machine tool temperature control system

The invention relates to a machine tool temperature control system, in particular to a method for inputting a cooling fluid into a machine tool to effectively remove heat from a main heat source on the machine tool, thereby controlling the temperature of the machine tool, in particular, the temperature generated by the working turntable. The problem of unevenness is improved.

In order to perform multi-directional machining, the body of the general machine tool is provided with at least one spindle for driving the cutter on the column of the machine body, and at least one static pressure rail linearly moving on the base of the machine body, and a working turntable for rotating motion With the motor that drives the work turntable. When the machine tool performs the machining operation, the heat source such as the spindle and the motor will generate a large amount of heat, and the guide rail and the work turntable are liable to cause the temperature to rise due to friction, and the physical phenomenon of shrinkage and thermal expansion occurs. It can be seen that the machine tool is often affected by a variety of heat sources and heating factors. If the temperature of the machine body during processing cannot be effectively controlled, it will affect the machining accuracy and cannot meet the technical requirements of high-precision machining.

In addition, the industry has developed a motor direct-drive hydrostatic working turntable, which is popular with high precision, large load and high dynamic response. The support force of the turntable located at the top of the work turntable is multiplied by oil. The oil is supplied by the oil film pressure generated by the oil injection, but the oil injection holes are distributed on a single circumference centered on the rotating shaft of the rotary table, so when the rotary disk rotates, the heat generated by the frictional movement of the oil film by the rotating disk is bound to be high. Concentration on the aforementioned circumference does not uniformly disperse, and thus a temperature gradient is generated, which adversely affects the processing accuracy.

In view of the foregoing, the main object of the present invention is to provide a power tool temperature control system capable of improving the temperature unevenness of the work turret.

A second object of the present invention is to provide a machine tool temperature control system capable of simultaneously controlling temperature of a main component of a machine tool.

To this end, the present invention provides a machine tool temperature control system, which is suitable for a machine tool body having a hydrostatic pressure turntable. The top of the hydrostatic pressure turntable is provided with a turntable, and the temperature control system includes a first circulating cooling line. The first circulating cooling pipe is connected to the inside of the machine tool body and is provided with a plurality of oil filling holes at the bottom of the rotating wheel, and the oiling holes are distributed at at least two circumferences centered on the rotating shaft of the rotating wheel but different radii on.

Thereby, the present invention can change the scattering position of the oil hole, that is, distribute it on at least two different circumferences, so that the heat generated by the friction can be smoothly dispersed along with the flow of the oil film, thereby avoiding the high concentration of heat. The problem of uneven temperature distribution.

Furthermore, the present invention can further provide a second circulating cooling line, a third circulating cooling line and a fourth circulating cooling line to respectively pass into the static pressure rail, the motor and the main shaft of the machine tool body, first A cooling fluid is recirculated in the fourth circulation cooling circuit to remove heat generated by the heat source; in addition, the power tool temperature control system of the present invention further has a temperature regulating device to adjust the first to fourth cycles. The temperature of the cooling fluid in the cooling circuit. Therefore, it is possible to stably control the temperature of each main component of the machine tool body.

10‧‧‧Tool machine temperature control system

21‧‧‧First cycle cooling line

22‧‧‧Second circulation cooling line

23‧‧‧ Third cycle cooling line

24‧‧‧ fourth cycle cooling line

30‧‧‧temperature control device

31‧‧‧ ice storage bucket

32‧‧‧Heat source unit

33‧‧‧Water injection pipeline

34‧‧‧Water outlet

35~38‧‧‧ heat exchanger

39‧‧ ‧ storage hot water tank

391‧‧‧Water mixing valve

40‧‧‧Base

50‧‧‧Hydraulic pressure bearing

51‧‧‧Outer Ring

511‧‧‧Axial retention

512‧‧‧ Radial Holder

513‧‧‧Axial support

52‧‧‧ Inner Ring

53‧‧‧ oil hole

60‧‧‧Rotary axis

61‧‧‧Loading Department

62‧‧‧Axis

70‧‧‧ Turntable

S‧‧‧temperature sensor

C‧‧‧ controller

P‧‧‧ pump

Figure 1 is a schematic illustration of a system in accordance with a preferred embodiment of the present invention.

Figure 2 is a schematic view of a work turntable in accordance with a preferred embodiment of the present invention.

Figure 3 is a schematic view showing the distribution of oil injection holes in the preferred embodiment of the present invention.

Referring to FIG. 1 , a power tool temperature control system 10 according to a first embodiment of the present invention has first to fourth circulating cooling lines 21 to 24 respectively connected to a hydrostatic pressure turntable of a machine tool body, and a static pressure. a heat source such as a rail, a motor and a main shaft, and each of the circulating cooling pipes 21 to 24 has a cooling fluid to reciprocate to remove heat generated by the heat source, and the cooling fluid is circulated at a constant flow rate and is the best choice for the present invention. Use energy efficiently. In addition, each of the circulating cooling pipes 21 to 24 is respectively provided with two temperature sensors S for inputting and outputting cooling fluid to the heat source of the machine tool, thereby detecting the temperature parameters of the cooling fluids of each of the circulating cooling pipes 21 to 24 and outputting To a controller C. It is to be added here that the aforementioned circulating cooling lines 21 to 24 may also be provided with only a single temperature sensor and selectively disposed at a position where the cooling fluid is input or output to the machine tool heat source.

The power tool temperature control system 10 is provided with a temperature regulating device 30 having an ice storage bucket 31, a heat source unit 32 for adjusting the temperature of the cooling water in the ice storage bucket 31, and a water injection pipe 33 and a water outlet pipe 34 respectively. The heat source unit 32 and the ice storage bucket 31 are respectively connected as follows: the water outlet pipe 33 is provided with four pumps P that are independently operated and controlled by the controller C for uniformly cooling the temperature outputted by the heat source unit 32. The water is transferred to the four heat exchangers 35 to 38, and the heat exchangers 35 to 38 are connected to the first to fourth circulating cooling lines 21 to 24 to transfer the heat of the cooling fluid to the water injecting line 33. The cooling water is then led back to the storage ice bucket 31 by the water outlet line 34 connected to the heat exchangers 35-38.

Thereby, the power tool temperature control system 10 of the present invention can utilize a single tone The cooling water of the temperature device 30 adjusts the temperature of the cooling fluid in the first to fourth circulating cooling lines 21 to 24, mainly according to the temperature parameter returned by each temperature sensor S, and then the controller C adjusts and controls each The output of the pump P is used to adjust the heat removal capability of each of the circulating cooling lines 21~24 to achieve the temperature control function of the machine tool body, which has the advantages of high efficiency and low equipment cost.

In addition, the temperature regulating device 30 may further be provided with a hot water storage tank 39 for storing hot water, and a water mixing valve 391 disposed at the water injection line 33 to receive the water flow from the heat source unit 32 and the hot water storage valve 39. Therefore, when the machine tool body is to be turned on, the machine tool temperature control system 10 can use the water mixing valve 391 to mix the hot water of the hot water storage tank 39 with the cooling water of the heat source unit, or simply output the hot water storage 39. The hot water is supplied to the water injection line 33 to increase the temperature of the cooling fluid in the first to fourth circulation cooling lines 35 to 38 to shorten the time for warming up the machine tool body. The aforementioned hot water storage tank 39 may also be connected to the heat source unit 32 to adjust the temperature of the stored hot water.

The hydrostatic pressure turret used in the machine tool body of the foregoing embodiment has a specific structure as shown in FIG. 2, and mainly includes a base 40 on which a hydrostatic bearing 50 is mounted. The rotating shaft 60 is disposed at the center of the hydrostatic bearing 50 and is driven by a motor (not shown), and a turntable 70 is fixedly coupled to the rotating shaft 60 to be synchronously rotated.

The hydrostatic bearing 50 is assembled by an outer ring 51 and an inner ring 52. The outer ring 51 is an axial retaining portion 511, a radial retaining portion 512 and an axial support from top to bottom. The portion 513, the radial holding portion 512 is sleeved on the outer circumferential surface of the inner ring 52, and the axial holding portion 511 and the axial support portion 513 respectively extend inwardly above and below the inner ring 52 to hold the inner ring 52. Axial position. The hydrostatic bearing 50 is further provided with a plurality of oil-filling holes 53 provided in the axial support portion 513 and communicating with the first circulating cooling line 21. In the present embodiment, the number of the oil-filling holes 53 is eight, and the distribution position is referred to As shown in FIG. 3, the oil hole 50 is distributed at the center of the rotating shaft of the turntable. But on two circles of different radii. Therefore, each oil hole 53 can be oiled toward the oil chamber (not shown) on the bottom surface of the inner ring 52, and an oil film can be formed between the inner ring 52 and the axial support portion 513, and the inner ring 52 is supported by the oil film pressure. The frictional force of the inner ring 52 relative to the rotation of the outer ring 51 is eliminated.

The rotating shaft 60 has a bearing portion 61 and a shaft portion 62 disposed below the center of the bearing portion 61. The outer bottom end of the bearing portion 61 is fixed to the inner ring 51 of the hydrostatic bearing 50, and can be connected to the turntable 70. The shaft portion 62 can be driven by a motor (not shown). Therefore, when the motor transmits power to the rotating shaft 60, the load of the rotating shaft 60 and the turntable 70 is transmitted to the inner ring 52 of the hydrostatic bearing 50, and the oil film pressure is used to provide the supporting force and reduce the friction. 70 can be operated at high speed and accurately.

Since the oil filling holes 53 are distributed on the circumferences of different radii, the heat of the oil film can be effectively diffused to make the temperature of the oil film more uniform, thereby improving the efficiency of temperature control and improving the processing precision. The foregoing oil-filling holes are staggered in this embodiment. Of course, those skilled in the art can change the position of the distribution or change the number thereof as appropriate, and should still be regarded as a simple change of the present invention.

In summary, the power tool temperature control system of the present invention utilizes the position change of the oil injection hole to improve the efficiency of the temperature adjustment, and at the same time, can use a single cooling device to cooperate with each pipeline to provide the temperature control function required for the main components of the machine tool body. It has the advantages of high efficiency and low cost.

40‧‧‧Base

51‧‧‧Outer Ring

52‧‧‧ Inner Ring

53‧‧‧ oil hole

Claims (10)

The utility model relates to a machine tool temperature control system, which is suitable for a machine tool body having a hydrostatic pressure turntable. The top of the hydrostatic pressure turntable is provided with a turntable. The temperature control system comprises a first circulating cooling line, and the first circulating cooling system The pipeline passes into the machine body and is provided with a plurality of oil injection holes at the bottom of the turntable, and the oil injection holes are distributed on at least two circumferences which are centered on the rotating shaft of the turntable but have different radii. The machine tool temperature control system of claim 1 has a second circulating cooling line, a third circulating cooling line and a fourth circulating cooling line respectively connected to a static pressure track of the machine tool body , a motor and a spindle. The machine tool temperature control system of claim 2, wherein each of the first to fourth circulating cooling lines has a cooling fluid and reciprocates in a constant flow manner. The temperature control system of the machine tool according to claim 2, which is provided with a temperature regulating device, comprising an ice storage bucket, a heat source unit for adjusting the temperature of the cooling water in the ice storage bucket, a water injection pipeline and a water outlet pipeline. The heat source unit and the ice storage bucket are respectively connected. The machine tool temperature control system of claim 4, wherein the water outlet pipe transfers the cooling water to the four heat exchangers respectively connected to the first to fourth circulating cooling lines. The power tool temperature control system of claim 5, comprising a controller, wherein each of the first to fourth circulating cooling lines has at least one temperature sensor, and the water outlet tube is provided with four independent operations. The pump is electrically connected to the temperature sensors and the pumps. The power tool temperature control system according to claim 4, wherein the temperature regulating device is provided with a hot water storage tank, and a water mixing valve is disposed in the water injection pipe to receive the water flow from the heat source unit and the hot water storage valve. The machine tool temperature control system of claim 1, wherein the hydrostatic pressure turntable further has a base, a hydrostatic bearing is disposed above the base, and a rotating shaft is disposed at the center of the hydrostatic bearing A motor is driven, and the turntable is fixed above the rotating shaft to be synchronously rotated. The machine tool temperature control system according to claim 8, wherein the hydrostatic bearing is assembled by an outer ring and an inner ring, the outer ring being an axial holding portion and a diameter from top to bottom. a radial retaining portion is sleeved on the outer circumferential surface of the inner ring, the axial support portion extends inwardly below the inner ring, and the oil injection holes are disposed in the axial direction The support portion can be oiled toward the inner ring. The machine tool temperature control system of any of claims 1 to 10, wherein the oil injection holes are staggered on the at least two circumferences.