Thermal displacement correction device and thermal displacement correction method
A technology of correction device and thermal displacement, applied in feeding device, automatic control device, program control, etc., can solve problems such as deviation and inability to correct thermal displacement
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no. 1 approach ＞
[0040] (1. Mechanical structure of the machine tool)
[0041] As an example of the machine tool 1, a horizontal machining center is taken as an example, refer to figure 1 as well as figure 2 to explain. That is, this machine tool is a machine tool having three linear axes (X, Y, Z axes) perpendicular to each other and a vertical rotation axis (B axis) as drive axes.
[0042] Such as figure 1 as well as figure 2 As shown, the machine tool 1 is composed of a bed 10 , a column 20 , a saddle 30 , a rotary spindle 40 , a stage 50 , a rotary stage 60 , a temperature sensor 70 , a control device 80 and a thermal displacement correction device 90 .
[0043] The bed 10 is formed in a substantially rectangular shape and is placed on the floor. However, the shape of the bed 10 is not limited to a rectangular shape. On the upper surface of the bed 10, a pair of X-axis guide rails 11a, 11b on which the column 20 can slide extends along the X-axis direction (horizontal direction) an...
no. 2 approach ＞
[0114] In the above-described embodiment, the amount of thermal displacement of the column 20 is estimated regardless of the X-axis position of the column 20 , and the amount of thermal displacement at the tip position of the rotary spindle 40 is calculated using the estimated value. In the present embodiment, the calculation is performed so that the amount of thermal displacement at the tip position of the rotary main shaft 40 becomes a different value depending on the X-axis position of the column 20 . Hereinafter, it will be described in detail.
[0115] The thermal variation correction device 190 of the present embodiment includes a block temperature acquisition unit 91 , a storage unit 195 , an FEM analysis unit 192 , a correction value calculation unit 193 , and a correction unit 94 . Therefore, among the respective configurations, the same components as those in the above-mentioned embodiment are assigned the same reference numerals and description thereof will be omitt...
no. 3 approach ＞
[0135] In the above-described embodiment, the FEM analysis unit 92 calculates the thermal displacement vector {δ} at the nodes of the Y-axis sliding surface 20 a of the column 20 . In addition, the FEM analysis unit 92 can also be as Figure 10 As shown, the thermal displacement amount vector {δ} at the node at the support reference position of the Y-axis ball screw 24 for moving the saddle 30 is calculated for the column 20 .
[0136] Here, refer to Figure 5 The connecting structure of the column 20 and the saddle 30 will be described. The column 20 and the Y-axis ball screw 24 are supported at both ends of the main body of the column 20 by the reference support body 25 and the auxiliary support body 26 . Generally, a ball screw expands in the axial direction when heated. In the case of such elongation, the position of the Y-axis ball screw 24 supported by the reference support 25 does not change, and the position of the Y-axis ball screw 24 supported by the auxiliary sup...
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