TWI652560B - Automatic compensation system and method for thermal deformation of cnc machine tool - Google Patents

Abstract

The invention relates to a computer numerical control tool machine for automatically increasing the temperature rise thermal deformation method, comprising the steps of: setting a sensing module on the machine tool body; performing a cutting operation on a workpiece by the machine tool body; and achieving a cutting processing time during the cutting operation When the cumulative value of the accumulation or the number of processing times is accumulated, the blade moving module moves in the first or second and third directions, and the sensing module touches the spindle of the machine tool body to obtain a measuring point. Comparing the coordinate values, comparing one of the reference points to the reference coordinate value and comparing the coordinate values to obtain an error amount, and calculating a thermal deformation compensation value according to the error amount and according to a thermal deformation compensation model. In addition, a computer numerical control tool machine temperature rise thermal deformation automatic compensation system has also been proposed.

Description

Computer numerical control tool machine temperature rise thermal deformation automatic compensation system and method thereof

The invention relates to a computer numerical control machine tool, and in particular to a computer numerical control tool machine temperature rise thermal deformation automatic compensation system and a method thereof.

During the operation of the machine tool, the spindle is driven by the motor to rotate at a high speed. The thermal deformation error of the machine tool is the largest proportion of all static and dynamic errors in the machine tool.

The machine tool is particularly sensitive to thermal deformation errors because the relative displacement between the spindle table and the tool causes a doubling of the amount of error for the diameter of the machined workpiece. In general, one of the reasons for the thermal deformation of the mechanism is that the cooling liquid in the cutting process flows to the bed surface after passing through the workpiece, and the bed surface is heated to cause thermal expansion. Another reason for the thermal deformation of the mechanism is that the heat source is generated during the cutting process, and the heat source generated by the high-speed rotation of the spindle is also transmitted to the machine tool body, causing the structure of the machine tool body to be deformed by the thermal expansion. Furthermore, the ambient temperature can also cause thermal deformation of the machine. These three heat sources cause the quality of the cutting process to deteriorate.

Therefore, how to improve and provide a "computer numerical control tool machine temperature rise thermal deformation automatic compensation system and its method" to avoid the above-mentioned problems, is an urgent problem to be solved in the industry.

The invention provides a method for automatically compensating for temperature rise and heat deformation of a computer numerical control tool machine, which can be used for thermal deformation compensation of hot deformation generated during actual machining.

The invention provides a computer numerical control tool machine temperature rise thermal deformation automatic compensation system, which can be used for thermal deformation compensation of the thermal deformation generated during actual machining.

The invention provides a computer numerical control tool machine temperature rise thermal deformation automatic compensation system, comprising a machine tool body, a blade moving module and a sensing module. The machine body contains a spindle. The blade moving module is movably coupled to the machine tool body. The sensing module is located on the machine tool body, and the tool machine body performs a cutting operation on a workpiece. When a set value is reached during the cutting operation, the blade moving module starts from the origin in a first direction or a second direction. The third direction is moved, and the sensing module touches the main shaft of the machine tool body to obtain a coordinate value of one of the measuring points, compares one of the reference points with the reference coordinate value and compares the coordinate value to obtain an error. The amount, by the error amount and according to a thermal deformation compensation model, calculates a thermal deformation compensation value, wherein the set value is the accumulation of the machining time or the accumulation of the machining times.

The invention further provides a computer numerical control tool machine temperature rise thermal deformation automatic compensation method, comprising the following steps: setting a sensing module on a machine tool body; the machine tool body performs a cutting operation on a workpiece; During the process, when the set value is reached, the blade moving module moves from the origin in the first direction or the second direction and the third direction, and the sensing module touches the spindle of the machine tool body to obtain one. One of the measuring points compares the coordinate value, compares one of the reference points with the reference coordinate value and compares the coordinate value to obtain an error amount, and calculates a thermal deformation compensation value according to the error amount and according to a thermal deformation compensation model, wherein setting Value is cutting plus The accumulation of work time or the accumulation of the number of processing times.

In order to make the invention more apparent, the following detailed description of the embodiments and the accompanying drawings are set forth below.

100, 200, 300‧‧‧ computer numerical control tool machine temperature rise thermal deformation automatic compensation system

110, 310‧‧‧Tool machine body

111‧‧‧ headstock

112‧‧‧ Spindle

113‧‧‧ Spindle chuck

114, 314‧‧‧ bed surface

120, 320‧‧‧blade moving module

121‧‧‧blade

122‧‧‧Tool holder

124, 324‧‧‧Tools

126‧‧‧blade

130‧‧‧Control Module

140, 240‧‧‧ Sensing Module

150‧‧‧Wireless transmission components

152‧‧‧Wireless transmission module

154‧‧‧Wireless Transmission Receiver Module

260‧‧‧Protection cover

311‧‧‧ column

321‧‧‧ headstock

322‧‧‧ slide table

323‧‧‧Workbench

325‧‧‧Tools

50‧‧‧Workpiece

D1‧‧‧ first error amount

D2‧‧‧ second error amount

T1‧‧‧ reference point status

O1‧‧‧ origin

PT‧‧‧ benchmark point coordinates

S1‧‧‧ Thermal deformation state

S2‧‧‧ Thermal deformation state

X‧‧‧ first direction

Y‧‧‧second direction

Z‧‧‧ third direction

S100‧‧‧Computer numerical control tool machine temperature rise thermal deformation automatic compensation method

S110~S150‧‧‧Steps

S132~S136‧‧‧Steps

1 is a schematic diagram of an embodiment of a computer temperature numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention.

2 is a schematic diagram of the automatic compensation system for temperature rise and heat deformation of the computer numerical control tool in FIG.

3 is a schematic view of another embodiment of a computer temperature numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention.

4 is a flow chart of a method for automatically compensating for temperature rise and heat deformation of a computer numerical control tool according to the present invention.

Fig. 5A is a schematic view showing a setting reference point of the present invention.

5B and 5C are schematic views respectively showing the measurement in the state of thermal deformation in the present invention.

FIG. 6 is a flow chart of establishing a thermal deformation compensation model according to the present invention.

FIG. 7 is a schematic diagram of still another embodiment of a computer temperature numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention.

The specific embodiments of the present invention are further described below in conjunction with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot Limiting the scope of protection of the present invention.

1 is a schematic diagram of an embodiment of a computer temperature numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention. 2 is a schematic diagram of the automatic compensation system for temperature rise and heat deformation of the computer numerical control tool in FIG. Please refer to Figure 1 first.

In this embodiment, the computer numerical control tool machine temperature rise thermal deformation automatic compensation system 100 includes a machine tool body 110, a blade movement module 120, a control module 130, and a sensing module 140.

The machine tool body 110 includes a spindle table 111, a spindle 112, a spindle chuck 113 and a bed surface 114. The spindle table 111 is connected to a rotatable spindle 112. The spindle 112 and the spindle chuck 113 are respectively located above the bed surface 114. The spindle 112 is coupled to a spindle chuck 113 for clamping the workpiece 50 for cutting.

The blade moving module 120 is movably coupled to the machine tool body 110. The blade moving module 120 includes a blade stage 121, a rotatable tool holder 122, a cutter 124, and a blade 126. The blade stage 120 is coupled to the tool holder 122, on which the tool 124 is mounted, and the blade 124 is mounted on the tool 124. The blade stage 120 can move in a first direction X, a second direction Y, and a third direction Z.

The control module 130 is disposed on the machine tool body 110. The control module 130 is configured to provide settings of the machining program coordinates and the tool wear and compensation offset.

Under the above configuration, when the spindle 112 rotates, the spindle 112 drives the spindle chuck 113 so that the workpiece 50 held by the spindle chuck 113 also rotates. The blade stage 121 in the blade moving module 120 moves in the first direction X, the second direction Y or the third direction Z such that the blade 126 comes into contact with the rotating workpiece 50. This action is called cutting. When cutting workpiece 50, work The body 110 will supply a cooling liquid that will flow through the area of the blade 126 that is in contact with the workpiece 50 to assist in cooling the workpiece 50 during the cutting process.

In this embodiment, the sensing module 140 is located in the tool body 110, and the sensing module 140 is connected to the control module 130. In detail, the sensing module 140 of the embodiment is connected by wireless transmission. The control module 130, the sensing module 140 is connected to a wireless transmission component 150, and the wireless transmission component 150 includes a wireless transmission transmitting module 152 and a wireless transmission receiving module 154. The wireless transmission transmitting module 152 is fixed to a position of a certain tool 124 on the tool holder 122. The sensing module 140 is fixed to the wireless transmission transmitting module 152, and the sensing module 140 is connected to the wireless transmission transmitting module 152. The wireless transmission transmitting module 152 is connected to the wireless transmission receiving module 154, and the wireless transmission receiving module 154 is connected to the control module 130.

However, this embodiment does not limit the arrangement of the sensing module 140. Referring to FIG. 3, FIG. 3 is a schematic diagram of another embodiment of the computer numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention. The computer numerical control tool machine temperature rise thermal deformation automatic compensation system 200 of FIG. 3 is similar to the computer numerical value control tool machine temperature rise thermal deformation automatic compensation system 100 of FIG. 1, wherein the same components are denoted by the same reference numerals and have the same effect. The description will not be repeated, and only the differences will be explained below.

The difference between FIG. 3 and FIG. 1 is that the sensing module 240 of the embodiment is disposed on the main shaft 112, and the sensing module 240 is connected to the control module 130 by means of wired transmission, and the line can be disposed on the main head. 111 is connected to the control module 130.

In an embodiment, the sensing module 240 can be moved to the main shaft 112, in other words, when the set value is not reached (such as the accumulation of the machining time or the accumulation of the machining times), the sensing module 240 can be moved to the main axis. Within the station 111. The sensing module 240 can be moved to the spindle when the measurement is performed. Above 112.

In an embodiment, the computer numerical control tool machine temperature rise thermal deformation automatic compensation system 200 includes a protective cover 260, and the protective cover 260 covers the sensing module 240, so that the sensing module can be protected when the detection is not performed. The group 240 prevents the iron filings and cutting water during the cutting process from damaging the sensing module 240; or the protective cover 260 can also move into the spindle table 111 together with the sensing module 240. During the measurement, the protective cover 260 can be opened for sensing by the sensing module 240.

4 is a flow chart of a method for automatically compensating for temperature rise and heat deformation of a computer numerical control tool according to the present invention. Referring to FIG. 4, the computer numerical value control tool machine temperature rise thermal deformation automatic compensation method S100 of the embodiment includes steps S110 to S150.

In step S110, a sensing module 140 is disposed on the machine tool body 110.

In detail, the sensing module 140 can be connected to the control module 130 by means of wireless transmission as shown in FIG. 1 and FIG. 2, or the sensing module 140 can be wired and transmitted as shown in FIG. Connected to the control module 130.

In step S120, a reference point is set.

In the process of setting the reference point, the calibration setting is first performed. The meaning of the calibration is to adjust the precision of the workpiece 50 to the allowable range by changing the machining program coordinates of the control module 130 and the setting of the tool wear and compensation offset. Inside. Then, the blade stage 121 in the blade moving module 120 is moved from the origin O1 in the first direction X or the second direction Y and the third direction Z, so that the sensing module 140 touches the main shaft 112 when sensing When the module 140 signal is in the on state, the coordinates touched by the sensing module 140 to the surface of the main shaft 112 and the tool wear compensation value are input to the control module 130 for use as the reference point position.

Taking FIG. 1 and FIG. 2 as an example, the blade stage 121 is moved above the main shaft 112, and the knife is moved. After the frame 122 is transferred to the position of the tool 124 having the sensing module 140, the tool 124 having the sensing module 140 is moved from the origin O1 in the first direction X, so that the sensing module 140 touches the spindle 112. At the same time, the touched signal will be transmitted by the wireless transmission transmitting module 152 to the wireless transmission receiving module 154, and the wireless transmission receiving module 154 transmits the touched signal to the control module 130 to complete the above action, as shown in FIG. 5A. As shown, FIG. 5A is a schematic diagram of setting a reference point of the present invention. During the step S120, the sensing module 140 has a reference point coordinate value PT in the reference point state T1. However, the present embodiment is not limited thereto, and the tool 124 is moved from the origin O1 in the first direction X, so that the cutter 124 touches the sensing module 240, so that the sensing module 140 touches When the sensing module 140 is in the open state, the coordinate of the sensing module 140 touching the surface of the main shaft 112 and the tool wear compensation value are input to the control module 130 to obtain the reference point coordinate value. PT.

In step S130, a thermal deformation compensation model is established.

Referring to FIG. 6 , in step S132 , when the temperature of the machine tool body 110 changes, the displacement amount of the measurement point and the displacement amount of the cutting point are separately recorded, wherein the measurement point is automatically measured by the sensing module 140 to the spindle 112. The amount of compensation, the cutting point is the amount of compensation for the cutting process from the blade 126 to the workpiece 50.

During the process of setting the measurement point, the control module 130 performs a measurement special signal, so that the tool 124 of the blade stage 121 moves from the origin O1 in the first direction X or the second direction Y and the third direction Z. The sensing module 140 touches the main shaft 112. When the sensing module 140 is turned on, the sensing module 140 touches the coordinate of the surface of the main shaft 112 to the control module 130 for use as a Compare the point locations.

In step S134, the control module 130 collects the displacement amount of the plurality of measurement points obtained in step S132 and the displacement amount of the cutting point.

Step S136, the control module 130 analyzes the relationship between the displacement amount of the measurement point and the displacement of the cutting point according to the displacement amount of the plurality of measurement points and the displacement amount of the cutting point obtained in step S134, to establish a relationship between the displacement amount of the measurement point and the displacement of the cutting point. A thermal deformation compensation model.

Referring to FIG. 4, in step S140, the machine tool body 110 performs a cutting operation on the workpiece 50.

Step S150, when a set value is reached during the cutting operation, the blade moving module 120 starts to move in a first direction X or a second direction Y and a third direction Z from the origin O1, and the sensing module The 130 touches the main shaft 112 of the machine tool body 110 to obtain the comparison coordinate value of the measurement point, compares the coordinate value of the reference point with the comparison coordinate value to obtain an error amount, and calculates the thermal deformation compensation value according to the thermal deformation compensation model. The set value is the accumulation of the machining time or the accumulation of the number of machining times.

As shown in FIG. 5B and FIG. 5C, FIG. 5B and FIG. 5C, FIG. 5B and FIG. 5C are respectively schematic views of the measurement in the state of thermal deformation in the present invention.

When the tool body 110 is thermally deformed, the relative displacement between the spindle 112 and the sensing module 140 is changed, and the thermal deformation state S1 or the thermal deformation state S2 may occur. After the automatic measurement, the thermal deformation state S1 will occur. The comparison coordinate value P1 is obtained, the thermal deformation state S2 obtains the comparison coordinate value P2, and the error between the comparison coordinate value P1 and the reference point coordinate value PT is the first error amount D1, and the error between the comparison coordinate value P2 and the reference point coordinate value PT is The second amount of error D2. The compensation operation is completed by transmitting the aforementioned error amount to the control module 130 to write the coordinate error correction of the tool.

FIG. 7 is a schematic diagram of still another embodiment of a computer temperature numerical control tool machine temperature rise thermal deformation automatic compensation system according to the present invention. The computer numerical control tool machine temperature rise thermal deformation automatic compensation system 300 of FIG. 7 is similar to the computer numerical control tool machine temperature rise thermal deformation automatic compensation system 100 of FIG. The same elements are denoted by the same reference numerals and have the same functions, and the description will not be repeated, and only the differences will be described below.

In this embodiment, the computer numerical control tool machine temperature rise thermal deformation automatic compensation system 300 is a vertical processing machine, which includes a machine tool body 310, a blade movement module 320, a control module 130, and a sense. Test module 140.

The machine body 310 includes a column 311, a main shaft 112, and a bed surface 314.

The blade moving module 320 is movably coupled to the machine tool body 310. The blade moving module 320 includes a spindle box 321 , a sliding table 322 , a table 323 , a cutter 324 , and a tool magazine 325 .

In this embodiment, the column 311 is connected to the spindle box 321, the head box 321 is connected to the magazine 325, and the head box 321 is connected to the rotatable spindle 112. The spindle 112 holds the cutter 324, and the spindle box 321 moves toward the third. Direction Z action.

In this embodiment, a movable sliding table 322 is connected to the bed surface 314. A table 323 is mounted on the sliding table 322, and a workpiece 50 is fixed on the table 323 for processing. The sliding table 322 is moved toward the first One direction X and one second direction Y action.

The control module 130 is disposed on the machine tool body 310. The control module 130 is disposed to provide a setting of the machining program coordinates and the tool wear and compensation offset.

Under the above configuration, when the spindle 112 rotates, the cutter 324 held by the spindle 112 also rotates at the same time. The headstock 321 in the blade moving module 320 moves in the third direction Z, and the sliding table 322 in the blade moving module 320 moves in the first direction X and the second direction Y, so that the rotating tool 324 and the table 323 are rotated. The workpiece 50 is touched, and this action is called cutting. When the vertical processing machine performs the cutting of the workpiece 50, the machine tool body 310 supplies a cooling liquid, and the cooling liquid It will flow through the area where the tool 324 touches the workpiece 50 to assist the vertical processing machine in cooling the workpiece 50 during the cutting process.

In this embodiment, the sensing module 140 is located in the machine tool body 310 , and the sensing module 140 is connected to the control module 130 . It should be noted that the sensing module 140 and the control module 130 can be connected in a wireless manner as in the foregoing FIG. 1 , but are not limited thereto.

The method for automatically adjusting the temperature rise thermal deformation of the computer numerical control tool machine of this embodiment can be as described in the foregoing FIG.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

Claims (8)

A computer numerical control tool machine temperature rise thermal deformation automatic compensation system, comprising: a machine tool body, comprising a spindle; a blade moving module, movably connected to the machine tool body; a control module; and a sensing The module is located on the machine tool body, and the sensing module is connected to the control module, wherein the tool machine body performs a cutting operation on a workpiece, and when the tool reaches a set value during the cutting operation, the blade moves the mold The group moves from a origin to a first direction, a second direction or a third direction, and the sensing module touches the main axis of the machine tool body to obtain a comparison of one measuring point The coordinate value is obtained by comparing a reference coordinate value of a reference point with the comparison coordinate value to obtain an error amount, and transmitting the error amount to the control module to write a coordinate error correction to a tool to complete the compensation. Action, where the set value is the accumulation of the machining time or the accumulation of the number of machining times. For example, the computer numerical control tool machine temperature rise thermal deformation automatic compensation system described in claim 1 is wherein the sensing module is connected to the control module by wireless transmission. The computer numerical control tool machine temperature rise thermal deformation automatic compensation system according to claim 2, wherein the blade movement module comprises a blade platform and a tool holder, the blade platform is connected to the tool holder, and the sensing module is The signal is connected to a wireless transmission component, and the wireless transmission component comprises a wireless transmission transmitting module and a wireless transmission receiving module. The wireless transmission transmitting module is fixed to the tool holder, and the wireless transmission transmitting module signal is connected to the wireless transmission receiving module. The wireless transmission receiving module signal is connected to the control module. For example, the computer numerical control tool machine mentioned in the first application patent scope automatically compensates for the temperature rise and heat deformation. The system, wherein the sensing module is connected to the control module by means of wired transmission. The computer numerical control tool machine temperature rise thermal deformation automatic compensation system according to claim 1, wherein the sensing module is movable to the main shaft. The computer numerical value control tool machine temperature rise thermal deformation automatic compensation system described in claim 5, further comprising: a protective cover covering the sensing module. The invention relates to a method for automatically adjusting a temperature rise thermal deformation of a computer numerical control tool, comprising the steps of: providing a sensing module on a machine tool body; performing a cutting operation on a workpiece by the machine tool body; and during the cutting operation, When the set value is reached, the blade moving module moves from the origin to a first direction, a second direction or a third direction, and the sensing module touches the spindle of the machine tool body to Obtaining a coordinate value of one of the measuring points, comparing a reference coordinate value of one of the reference points with the comparison coordinate value to obtain an error amount, and transmitting the error amount to a control module to write to a tool The coordinate error is corrected to complete the compensation action, wherein the set value is the accumulation of the machining time or the accumulation of the number of machining times. The method for automatically adjusting the temperature rise thermal deformation of the computer numerical control tool as described in claim 7 includes the following steps: setting a reference point; and establishing a thermal deformation compensation model.