Automatic compensation and correction structure for thermal expansion effects

Abstract

The present invention relates to an automatic compensation and correction structure for thermal expansion effect, and is particularly used for a processing machine for processing panels. The X-axis of the processing machine adopts a carbon fiber composite structure and the Y-axis adopts an iron composite workbench structure. When the working environment temperature of the processing machine MT is higher than the standard operating temperature, that is, when the thermal expansion effect occurs, the workbench base and the first locking block, the second locking block, and the third locking block move in the same direction, and the first slider, the second slider, the third slider, the front clamp fixing base, the front clamp positioning seat, the rear clamp fixing base, the rear clamp positioning seat and the panel workbench are compensated and corrected to maintain the same working position as the processing axis.

Description

Technical Field

[0001] The invention relates to a deviation correction structure, and in particular to an automatic compensation and correction structure for thermal expansion effect. Background Art

[0002] Precision machining processes and machining machines help produce good products. With the advancement of science and technology, machining technology has become more and more sophisticated, and the quality requirements for products have also become increasingly higher. It is understandable that when a machining machine is processing a workpiece, the structure of the machining machine will be thermally deformed due to various internal and external heat sources such as the external environment and machining heat, thereby affecting the machining accuracy. For example, but not limited to, the relative position of the tool and the workpiece is offset, causing deviations in the overall machining size, shape, and position. However, most general machining machines only perform tool position correction at the beginning, and ignore the thermal deformation error during the machining process, so no offset compensation is performed, resulting in limited machining accuracy and the inability to improve product quality. There are shortcomings that need to be improved urgently.

[0003] Therefore, how to solve the above-mentioned problems and deficiencies of the prior art has become a research and development topic that relevant industry players are eager to research and develop. Summary of the invention

[0004] The object of the present invention is to provide an automatic compensation and correction structure for thermal expansion effects.

[0005] The present invention provides an automatic compensation and correction structure for thermal expansion effect, which is particularly used for a processing machine for processing a plate and the processing machine has a plurality of servo axes. The X-axis of the processing machine adopts a low expansion rate composite material combination structure and the Y-axis adopts an iron sheet composite workbench structure. The automatic compensation and correction structure for thermal expansion effect includes a workbench base, a first locking block, a first locking block left linear rail, a first locking block right linear rail, a first slider, a first low expansion rate strip, a front clamp fixing base, a front clamp positioning seat and a plate workbench. The workbench base is made of iron. The first locking block is fixed to the workbench base by a plurality of first locking block screws. The first locking block has a concave appearance and has a first locking block accommodating space. The first locking block left linear rail is installed on an inner concave side wall of the first locking block. The first locking block right linear rail is installed on another inner concave side wall of the first locking block. The first slider has a concave appearance and a first slider accommodation space, and a first slider left linear rail and a first slider right linear rail are fixedly arranged below the two sides of the first slider, wherein the first slider is arranged in the first locking block accommodation space, wherein the first locking block left linear rail and the first slider left linear rail are connected by a bearing, and the first locking block right linear rail and the first slider right linear rail are connected by a bearing. A first low expansion rate strip, one side of which is fixed to the center point of the workbench base, and a part of the other side of which is locked in the first slider accommodation space of the first slider, wherein the thermal expansion rate of the workbench base is 3 to 10 times that of the first low expansion rate strip, wherein the material of the first low expansion rate strip is the same as the material of the X-axis of the processing machine. A front clamp fixing base, which is fixed above the two sides of the first slider. A front clamp positioning seat, which is fixed above the front clamp fixing base. A panel workbench, a portion of which is arranged above the front clamp positioning seat and fixed to the front clamp fixing base, wherein when the thermal expansion effect occurs, the workbench base and the first locking block move in the same direction, and the first slider, the front clamp fixing base, the front clamp positioning seat and the panel workbench are compensated and corrected to maintain the same working position as the processing axis.

[0006] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further comprises a second locking block and a third locking block. The second locking block is fixed to the workbench base by a plurality of second locking block screws, the second locking block is concave in appearance and has a second locking block accommodating space. The third locking block is fixed to the workbench base by a plurality of third locking block screws, the third locking block is concave in appearance and has a third locking block accommodating space.

[0007] In one embodiment of the present invention, the automatic compensation and correction structure for the thermal expansion effect further includes a second locking block left linear rail, a second locking block right linear rail, a third locking block left linear rail and a third locking block right linear rail. The second locking block left linear rail is mounted on a concave side wall of the second locking block. The second locking block right linear rail is mounted on another concave side wall of the second locking block. The third locking block left linear rail is mounted on a concave side wall of the third locking block. The third locking block right linear rail is mounted on another concave side wall of the third locking block.

[0008] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further includes a second slider, which has a concave appearance and a second slider accommodating space, and a second slider left linear rail and a second slider right linear rail are fixedly provided below the two sides of the second slider, wherein the second slider is arranged in the second locking block accommodating space, wherein the second locking block left linear rail and the second slider left linear rail are connected to each other by a bearing, and the second locking block right linear rail and the second slider right linear rail are connected to each other by a bearing.

[0009] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further includes a third slider. The third slider has a concave appearance and has a third slider accommodation space, and a third slider left linear rail and a third slider right linear rail are fixedly arranged below the two sides of the third slider, wherein the third slider is arranged in the third locking block accommodation space, wherein the third locking block left linear rail and the third slider left linear rail are connected to each other by a bearing, and the third locking block right linear rail and the third slider right linear rail are connected to each other by a bearing.

[0010] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further comprises a second low expansion rate strip. One side of the second low expansion rate strip is fixed to the center point of the workbench base, and a portion of the other side of the second low expansion rate strip is locked to the second slider accommodation space of the second slider, wherein the thermal expansion rate of the workbench base is 3 to 10 times the thermal expansion rate of the second low expansion rate strip, and the second low expansion rate strip is parallel to the first low expansion rate strip, wherein the material of the second low expansion rate strip is the same as the material of the X-axis of the processing machine.

[0011] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further comprises a third low expansion rate strip. The third low expansion rate strip has one side fixed to the center point of the workbench base, and a portion of the other side thereof is locked to the third slider accommodation space of the third slider, wherein the thermal expansion rate of the workbench base is 3 to 10 times the thermal expansion rate of the third low expansion rate strip, and the third low expansion rate strip is parallel to the second low expansion rate strip, wherein the material of the third low expansion rate strip is the same as the material of the X-axis of the processing machine.

[0012] In one embodiment of the present invention, the automatic compensation and correction structure for thermal expansion effect further comprises a rear clamp fixing base and a rear clamp positioning base. The rear clamp fixing base is fixedly arranged above both sides of the second slider and both sides of the third slider. The rear clamp positioning base is fixedly arranged above the rear clamp fixing base, wherein the rear clamp positioning base has a plurality of pin holes, wherein another part of the plate workbench is arranged above the rear clamp positioning base and fixedly arranged on the front clamp fixing base.

[0013] In one embodiment of the present invention, when the thermal expansion effect occurs, the workbench base and the second locking block move in the same direction, and the second slider, the rear clamp fixing base, the rear clamp positioning seat and the plate workbench are compensated and corrected to maintain the same working position as the processing axis.

[0014] In one embodiment of the present invention, when the thermal expansion effect occurs, the workbench base and the third locking block move in the same direction, and the third slider, the rear clamp fixing base, the rear clamp positioning seat and the plate workbench are compensated and corrected to maintain the same working position as the processing axis.

[0015] In summary, the automatic compensation and correction structure for thermal expansion effect disclosed in the present invention can bring the following effects:

[0016] 1. It can effectively eliminate the offset and misalignment errors caused by thermal expansion effects;

[0017] 2. Save costs and reduce the weight of the processing machine; and

[0018] 3. Real-time compensation and correction with zero delay can be achieved without back-end calculations through the controller or software system.

[0019] The following detailed description is based on specific embodiments to make it easier to understand the purpose, technical content, characteristics and effects achieved by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a processing machine according to the present invention.

[0021] Figure 2 It is a schematic diagram of the automatic compensation and correction structure of the thermal expansion effect of the present invention.

[0022] Figure 3 It is a three-dimensional exploded schematic diagram of the automatic compensation and correction structure of the thermal expansion effect of the present invention.

[0023] Figure 4 This is a first action diagram of the automatic compensation and correction structure for thermal expansion effect of the present invention.

[0024] Figure 5This is a second action diagram of the automatic compensation and correction structure for thermal expansion effect of the present invention.

[0025] Figure 6 This is the third action diagram of the automatic compensation and correction structure for thermal expansion effect of the present invention.

[0026] Explanation of reference numerals: MT-processing machine; 100-automatic compensation and correction structure for thermal expansion effect; 101-workbench base; 102-first locking block; 102A-first locking block accommodating space; 103-first locking block left linear rail; 104-first locking block right linear rail; 105-first slider; 106-first slider accommodating space; 107-first slider left linear rail; 108-first slider right linear rail; 109-first low expansion rate strip; 110-front clamp fixing base; 111-front clamp positioning seat; 112-plate workbench; 113-second locking block; 114-second locking block accommodating space; 115-third locking block Block; 116-third locking block accommodating space; 117-second locking block left linear rail; 118-second locking block right linear rail; 119-third locking block left linear rail; 120-third locking block right linear rail; 121-second slider; 122-second slider accommodating space; 123-second slider left linear rail; 124-second slider right linear rail; 125-third slider; 126-third slider accommodating space; 127-third slider left linear rail; 128-third slider right linear rail; 129-second low expansion rate strip; 130-third low expansion rate strip; 131-rear clamp fixing base; 132-rear clamp positioning seat; 132P-pin hole. DETAILED DESCRIPTION

[0027] In order to solve the problem of offset error caused by thermal expansion effect in existing processing machines, the inventor has conducted years of research and development to improve the shortcomings of existing products. The following will introduce in detail how the present invention uses an automatic compensation and correction structure for thermal expansion effect to achieve the most efficient functional requirements.

[0028] See also Figures 1 to 3 , Figure 1 It is a schematic diagram of a processing machine according to the present invention. Figure 2 It is a schematic diagram of the automatic compensation and correction structure of the thermal expansion effect of the present invention. Figure 3The figure is a three-dimensional exploded schematic diagram of the automatic compensation and correction structure of the thermal expansion effect of the present invention. As shown in the figure, the automatic compensation and correction structure 100 of the thermal expansion effect disclosed by the present invention is particularly suitable for a processing machine MT for processing a plate and the processing machine MT has a plurality of servo axes. The X-axis of the processing machine MT adopts a low expansion rate composite material combination structure and the Y-axis adopts an iron sheet composite workbench structure. In the embodiment of the present invention, the processing machine MT is a machine with six servo axes and is symmetrical to each other. The X-axis of the processing machine MT is a low thermal expansion material. In other embodiments, the low thermal expansion material can be granite, invariant steel or zero expansion ceramic. The automatic compensation and correction structure 100 for thermal expansion effect includes a workbench base 101, a first locking block 102, a first locking block left linear rail 103, a first locking block right linear rail 104, a second locking block 113, a second locking block left linear rail 117, a second locking block right linear rail 118, a third locking block 115, a third locking block left linear rail 119, a third locking block right linear rail 120, a first slider 105, a second slider 121, a third slider 125, a first low expansion rate strip 109, a second low expansion rate strip 129, a third low expansion rate strip 130, a front clamp fixing base 110, a front clamp positioning seat 111, a rear clamp fixing base 131, a rear clamp positioning seat 132 and a panel workbench 112, wherein the material of the first to third low expansion rate strips 109, 129 and 130 is the same as the material of the X-axis of the processing machine to ensure the synchronization of the expansion rate. In one embodiment, the first to third low expansion coefficient strips 109, 129 and 130 may be carbon strips, and the X-axis of the machine table MT is a carbon fiber composite material. In another embodiment, the first to third low expansion coefficient strips 109, 129 and 130 may be Invar, which is an iron alloy containing 35.4% nickel and has a very low thermal expansion coefficient at room temperature (between -20°C and 20°C, with an average value of about 1.6×10-6 / °C), and the X-axis of the machine table MT is made of Invar.

[0029] Continue to refer Figures 1 to 3In this processing machine MT, the workbench base 101 is made of iron. The first locking block 102 is fixed to the workbench base 101 by a plurality of first locking block screws. The first locking block 102 is concave in appearance and has a first locking block accommodating space 102A. The first locking block left linear rail 103 is installed on an inner concave side wall of the first locking block 102. The first locking block right linear rail 104 is installed on another inner concave side wall of the first locking block 102. The first slider 105 is concave in appearance and has a first slider accommodating space 106, and a first slider left linear rail 107 and a first slider right linear rail 108 are fixedly provided at the lower sides of the first slider 105, wherein the first slider 105 is arranged in the first locking block accommodating space 102A, wherein the first locking block left linear rail 103 and the first slider left linear rail 107 are connected by a bearing to each other, and the first locking block right linear rail 104 and the first slider right linear rail 108 are connected by a bearing to each other. One side of the first low expansion strip 109 is fixed to the center point of the workbench base 101, and a portion of the other side of the first low expansion strip 109 is locked in the first slider accommodating space 106 of the first slider 105, wherein the thermal expansion rate of the workbench base 101 is 3 to 10 times the thermal expansion rate of the first low expansion strip 109.

[0030] In addition, the second locking block 113 is fixed to the workbench base 101 by a plurality of second locking block screws, and the second locking block 113 has a concave appearance and has a second locking block accommodating space 114. The third locking block 115 is fixed to the workbench base 101 by a plurality of third locking block screws, and the third locking block 115 has a concave appearance and has a third locking block accommodating space 116. The second locking block left linear rail 117 is installed on a concave side wall of the second locking block 113. The second locking block right linear rail 118 is installed on another concave side wall of the second locking block 113. The third locking block left linear rail 119 is installed on a concave side wall of the third locking block 115. The third locking block right linear rail 120 is installed on another concave side wall of the third locking block 115. The second slider 121 has a concave appearance and has a second slider accommodation space 122, and a second slider left linear rail 123 and a second slider right linear rail 124 are fixedly disposed below the two sides of the second slider 121, wherein the second slider 121 is disposed in the second lock block accommodation space 114, wherein the second lock block left linear rail 117 and the second slider left linear rail 123 are connected by a bearing, and the second lock block right linear rail 118 and the second slider right linear rail 124 are connected by a bearing. The third slider 125 has a concave appearance and has a third slider accommodation space 126, and a third slider left linear rail 127 and a third slider right linear rail 128 are fixedly disposed below the two sides of the third slider 125, wherein the third slider 125 is disposed in the third lock block accommodation space 116, wherein the third lock block left linear rail 119 and the third slider left linear rail 127 are connected by a bearing, and the third lock block right linear rail 120 and the third slider right linear rail 128 are connected by a bearing.

[0031] One side of the second low expansion strip 129 is fixed to the center point of the workbench base 101, and a portion of the other side of the second low expansion strip 129 is locked in the second slider accommodating space 122 of the second slider 121, wherein the thermal expansion rate of the workbench base 101 is 3 to 10 times the thermal expansion rate of the second low expansion strip 129, and the second low expansion strip 129 is parallel to the first low expansion strip 109. One side of the third low expansion strip 130 is fixed to the center point of the workbench base 101, and a portion of the other side of the third low expansion strip 130 is locked in the third slider accommodating space 126 of the third slider 125, wherein the thermal expansion rate of the workbench base 101 is 3 to 10 times the thermal expansion rate of the third low expansion strip 130, and the third low expansion strip 130 is parallel to the second low expansion strip 129. It is worth mentioning that, Figure 2 As shown, because the processing machine MT with six servo axes is symmetrical on the left and right, the processing machine MT has two first low expansion rate strips 109 located on the left and right sides respectively, two second low expansion rate strips 129 located on the left and right sides respectively, and two third low expansion rate strips 130 located on the left and right sides respectively, all of which use the center point of the processing machine MT as a fixed point.

[0032] The front clamp fixing base 110 is fixedly arranged above both sides of the first slider 105. The front clamp positioning seat 111 is fixedly arranged above the front clamp fixing base 110. A part of the plate workbench 112 is arranged above the front clamp positioning seat 111 and fixedly arranged on the front clamp fixing base 110, and the plate workbench 112 has a plurality of pin holes and the plate to be processed can be fixed on the plate workbench 112 by pins. The rear clamp fixing base 131 is fixedly arranged above both sides of the second slider 121 and both sides of the third slider 125. The rear clamp positioning seat 132 is fixedly arranged above the rear clamp fixing base 131, wherein the rear clamp positioning seat 132 has a plurality of pin holes 132P, wherein another part of the plate workbench 112 is arranged above the rear clamp positioning seat 132 and fixedly arranged on the rear clamp fixing base 131.

[0033] Please refer to Figures 4 to 6 , Figure 4 This is a first action diagram of the automatic compensation and correction structure for thermal expansion effect of the present invention. Figure 5 This is a second action diagram of the automatic compensation and correction structure for thermal expansion effect of the present invention.

[0034] Figure 6 This is the third action diagram of the automatic compensation and correction structure of the thermal expansion effect of the present invention. When the working environment temperature of the processing machine MT is higher than the standard operating temperature, that is, Figure 4As shown, when the thermal expansion effect occurs, the workbench base 101 and the first locking block 102, the second locking block 113 and the third locking block 115 move in the same direction, and the first slider 105, the second slider 121 and the third slider 125, the front clamp fixing base 110, the front clamp positioning seat 111, the rear clamp fixing base 131, the rear clamp positioning seat 132 and the panel workbench 112 are compensated and corrected to maintain the same working position as the processing axis. Furthermore, because the thermal expansion rate of the first low expansion rate strip 109, the second low expansion rate strip 129 and the third low expansion rate strip 130 is the same as the X-axis of the processing machine MT, they can be expanded or contracted synchronously to ignore the error of misalignment caused by the thermal expansion effect. In addition, although the thermal expansion rate of the workbench base 101 is about 10 times that of the first low expansion rate strip 109, the second low expansion rate strip 129 and the third low expansion rate strip 130, because the workbench base 101, the locking block (102, 113 and 115) and the locking block linear rail (103, 104, 117 , 118, 119 and 120) are fixed to each other and there are bearings between the locking block linear rails (103, 104, 117, 118, 119 and 120) and the corresponding slider linear rails (107, 108, 123, 124, 127 and 128), so the workbench base 101 and the locking blocks (102, 113 and 115) will slide along the thermal expansion effect without driving the first slider 105, the second slider 121 and the third slider 125, the front clamp fixing base 110, the front clamp positioning seat 111, the rear clamp fixing base 131, the rear clamp positioning seat 132 and the plate workbench 112 to move.

[0035] In summary, the automatic compensation and correction structure for thermal expansion effect disclosed in the present invention can bring the following effects:

[0036] 1. It can effectively eliminate the offset and misalignment errors caused by thermal expansion effects;

[0037] 2. Save costs and reduce the weight of the processing machine; and

[0038] 3. Real-time compensation and correction with zero delay can be achieved without back-end calculations through the controller or software system.

[0039] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all will fall within the scope of protection of the present invention.

Claims

1. An automatic compensation and correction structure for thermal expansion effect, suitable for a processing machine for processing plate parts, the processing machine has a plurality of servo axes, the X axis of the processing machine is a composite structure of low expansion rate composite materials and the Y axis is an iron composite workbench structure, characterized in that: The automatic compensation and correction structure of the thermal expansion effect includes: A workbench base made of iron; A first locking block, which is fixed to the workbench base by a plurality of first locking block screws, and the first locking block has a concave appearance and has a first locking block accommodating space; A first locking block left linear rail, which is mounted on a concave side wall of the first locking block; A first locking block right linear rail, mounted on another concave side wall of the first locking block; A first slider having a concave appearance and a first slider accommodating space, and a first slider left linear rail and a first slider right linear rail are fixedly arranged below the two sides of the first slider, the first slider is arranged in the first locking block accommodating space, the first locking block left linear rail and the first slider left linear rail are connected by a bearing, and the first locking block right linear rail and the first slider right linear rail are connected by a bearing; a first low expansion rate strip, one side of which is fixed to the center point of the workbench base, and a portion of the other side of which is locked in the first slider accommodation space of the first slider, the thermal expansion rate of the workbench base is 3 to 10 times the thermal expansion rate of the first low expansion rate strip, wherein the material of the first low expansion rate strip is the same as the material of the X-axis of the processing machine; A front clamp fixing base, which is fixedly arranged above both sides of the first sliding block; A front clamp positioning seat, which is fixed above the front clamp fixing base; and A plate workbench, a portion of which is arranged above the front clamp positioning seat and fixed to the front clamp fixing base, wherein when the thermal expansion effect occurs, the workbench base can move in the same direction as the first locking block, and the first slider, the front clamp fixing base, the front clamp positioning seat and the plate workbench are compensated and corrected to maintain the same working position as the processing axis.

2. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 1, characterized in that: Also includes: a rear clamp positioning seat, and another part of the plate workbench is arranged above the rear clamp positioning seat; a second locking block, provided with a second slider, on which a second low expansion rate strip is provided, a portion of the plate workbench is connected to the second slider through a rear clamp positioning seat, and then together with the first low expansion rate strip eliminates the offset caused by the thermal expansion effect, the second locking block is fixed to the workbench base by a plurality of second locking block screws, the second locking block is concave in appearance and has a second locking block accommodating space; and A third locking block is provided with a third sliding block, on which a third low expansion rate strip is provided. A portion of the panel workbench is connected to the third sliding block through a rear clamp positioning seat, thereby jointly eliminating the displacement caused by the thermal expansion effect with the first low expansion rate strip. The third locking block is fixed to the workbench base by a plurality of third locking block screws. The third locking block has a concave appearance and has a third locking block accommodating space.

3. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 2, characterized in that: Also includes: A second locking block left linear rail, mounted on a concave side wall of the second locking block; A second locking block right linear rail, mounted on another concave side wall of the second locking block; A third locking block left linear rail, which is mounted on a concave side wall of the third locking block; and A third locking block right linear rail is installed on the other concave side wall of the third locking block.

4. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 3, characterized in that: The second slider has a concave appearance and has a second slider accommodating space, and a second slider left linear rail and a second slider right linear rail are fixedly provided below the two sides of the second slider, wherein the second slider is arranged in the second locking block accommodating space, wherein the second locking block left linear rail and the second slider left linear rail are connected to each other through a bearing, and the second locking block right linear rail and the second slider right linear rail are connected to each other through a bearing.

5. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 4, characterized in that: The third slider has a concave appearance and has a third slider accommodating space, and a third slider left linear rail and a third slider right linear rail are fixedly provided below both sides of the third slider, the third slider is arranged in the third locking block accommodating space, the third locking block left linear rail and the third slider left linear rail are connected to each other through a bearing, and the third locking block right linear rail and the third slider right linear rail are connected to each other through a bearing.

6. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 5, characterized in that: One side of the second low expansion strip is fixed to the center point of the workbench base, and a portion of the other side is locked in the second slider accommodating space of the second slider, wherein the thermal expansion rate of the workbench base is 3 to 10 times the thermal expansion rate of the second low expansion strip, and the second low expansion strip is parallel to the first low expansion strip, and the material of the second low expansion strip is the same as the material of the X-axis of the processing machine.

7. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 6, characterized in that: One side of the third low expansion strip is fixed to the center point of the workbench base, and a portion of the other side is locked in the third slider accommodating space of the third slider, wherein the thermal expansion rate of the workbench base is 3 to 10 times the thermal expansion rate of the third low expansion strip, and the third low expansion strip is parallel to the second low expansion strip, and the material of the third low expansion strip is the same as the material of the X-axis of the processing machine.

8. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 7, characterized in that: Also includes: a rear clamp fixing base, which is fixedly disposed above both sides of the second slider and both sides of the third slider; and A rear clamp positioning seat is fixedly arranged above the rear clamp fixing base, and the rear clamp positioning seat has a plurality of pin holes. Another part of the plate workbench is arranged above the rear clamp positioning seat and fixedly arranged on the rear clamp fixing base.

9. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 8, characterized in that: When the thermal expansion effect occurs, the workbench base and the second locking block move in the same direction, and the second sliding block, the rear clamp fixing base, the rear clamp positioning seat and the plate workbench are compensated and corrected to maintain the same working position as the processing axis.

10. The automatic compensation and correction structure for thermal expansion effect as claimed in claim 8, characterized in that: When the thermal expansion effect occurs, the workbench base and the third locking block move in the same direction, and the third sliding block, the rear clamp fixing base, the rear clamp positioning seat and the plate workbench are compensated and corrected to maintain the same working position as the processing axis.

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