High-speed numerical control gantry guide rail grinding machine precision improving device and method

Abstract

The present application relates to high-speed numerical control gantry guide rail grinding machine precision device and method, including bed and V type guide rail adopts split structure, V type guide rail sets several sections, the upper end of the bed is provided with a guide positioning key, and the lower end of the V type guide rail is provided with a positioning groove, which is precisely matched, the temperature rise of each V type guide rail is detected in real time, and the temperature is intelligently controlled, the temperature collection point is arranged close to the inner surface of the V type guide rail body and away from the cooling through hole, the present integral V type guide rail sliding friction heating expansion causes the deformation and distortion problem to be solved, not only meet the processing assembly process, but also effectively solve the problem that the linear and flatness of the precision grinding key part guide rail is out of tolerance caused by the long time continuous high-speed reciprocating motion of the high-speed numerical control gantry guide rail grinding machine, the grinding marks of the precision grinding part guide rail are eliminated, and the grinding precision and running speed of the high-speed numerical control gantry guide rail grinding machine are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of CNC gantry guideway grinding machine manufacturing technology, specifically to a device and method for improving the accuracy of high-speed CNC gantry guideway grinding machines. Background Technology

[0002] China has become the world's largest manufacturing nation and the largest consumer market for industrial machine tools. With the advanced manufacturing industry trending towards high-precision, high-speed, intelligent, and digitalized high-quality development, especially with the stringent requirements for high-speed grinding and precision machining of key components such as guide rails (tracks) in key industries like high-end industrial machine tools, aerospace, military, and high-speed rail, this is primarily achieved by improving the precision of high-speed CNC gantry rail grinding machines. CNC gantry rail grinding machines are core foundational equipment driving the high-quality development of advanced high-end equipment manufacturing.

[0003] like Figures 8-10 As shown, an existing high-speed CNC gantry grinding machine has an integrated V-shaped guide rail on one side of its upper part. The V-shaped guide rail and the convex guide rail on the lower part of the worktable form a sliding guide rail pair. Since the integrated V-shaped guide rail and the machine bed are a single structure, and the deformation of the machine bed caused by the heat generated by the sliding friction between the V-shaped guide rail and the convex guide rail during long-term high-speed reciprocating motion is significantly different from the thermal expansion (elongation) of the V-shaped guide rail itself, this causes the V-shaped guide rail to deform and twist due to thermal expansion. This severely affects the reciprocating linear motion accuracy of the convex guide rail that it is paired with, and further causes the V-shaped guide rail on one side of the worktable of the high-speed CNC gantry grinding machine to deform and twist. Ultimately, this leads to out-of-tolerance straightness of the guide rails in the precision machining of key parts by universal grinding heads, out-of-tolerance flatness of the guide rails in the precision machining of key parts by horizontal grinding heads, and grinding marks during the feed motion. The aforementioned technical problems prevent existing high-speed CNC gantry rail grinding machines from meeting the urgent need for high-speed grinding of precision rails for key components in these industries, severely impacting the leap in the quality of high-efficiency grinding and precision machining of rails (tracks) for key components in these industries. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of excessive straightness and flatness of the guide rails in the precision machining of key parts of high-speed CNC gantry guide rail grinding machines due to long-term continuous high-speed reciprocating grinding feed motion, as well as the easy generation of grinding marks by the feed motion. The invention provides a device and method for improving the accuracy of high-speed CNC gantry guide rail grinding machines, which has the advantages of reasonable structural design, independent intelligent temperature rise control for each V-shaped guide rail section, and high accuracy of table straightness and flatness.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a precision improvement device for a high-speed CNC gantry grinding machine, comprising a bed, a linear guide rail on one side of the upper end of the bed, and a guide positioning key integrated with the bed on the other side; multiple V-shaped guide rails are sequentially arranged along the length of the upper end of the bed, and a worktable is provided at the upper end of the linear guide rail and the V-shaped guide rail; each V-shaped guide rail has a V-shaped surface at the upper end and a positioning groove at the lower end, and each V-shaped guide rail is precisely installed on the bed through the positioning groove and the guide positioning key; two cooling channels for cooling the V-shaped surface are symmetrically arranged on the V-shaped guide rail, one end of the cooling channel is connected to an air inlet and the other end is connected to an exhaust port, the air inlet is connected to a solenoid valve through an air inlet pipe, the solenoid valve is connected to an air cooler through a pipeline, a temperature sensor is provided on each V-shaped guide rail, the temperature sensor is connected to a control system, and the control system is connected to the air cooler and the solenoid valve respectively.

[0006] As a further technical solution, the upper end of the bed is provided with the guide positioning key protruding upwards, and the guide positioning key is designed in the shape of a cuboid. The lower end of the V-shaped guide rail is recessed in the middle of the positioning groove, and the positioning groove is set on the guide positioning key.

[0007] As a further technical solution, the depth of the positioning groove is not equal to the height of the guide positioning key.

[0008] As a further technical solution, the guide positioning key is provided with a plurality of internal threaded holes evenly spaced along its length direction, and the corresponding V-shaped guide rail is provided with a plurality of countersunk holes evenly spaced along its length direction. The countersunk holes are provided with hexagonal socket bolts, and the hexagonal socket bolts are installed on the internal threaded holes to fasten the V-shaped guide rail to the bed.

[0009] As a further technical solution, the cooling channel includes a plurality of cooling through holes evenly spaced along the V-shaped surface. The cooling through holes are arranged along the length direction of the V-shaped guide rail. One end of the lower cooling through hole is connected to the air inlet, and one end of the upper cooling through hole is connected to the exhaust hole. The air inlet and exhaust hole are arranged perpendicular to the length direction of the cooling through holes. End caps are provided at both ends of the V-shaped guide rail. A connecting groove is provided on the inner side of the end cap to connect all the cooling through holes in the same cooling channel.

[0010] As a further technical solution, the V-shaped guide rail is provided with a temperature sensor mounting hole, the temperature sensor is mounted on the temperature sensor mounting hole, and the temperature sensor's collection point is set close to the V-shaped surface and away from the cooling through hole.

[0011] As a further technical solution, one side of the lower end of the workbench is mounted on a linear guide rail via a guide rail block, and the other side is slidably mounted on the V-shaped guide rail via a convex guide rail that matches the V-shaped guide rail. A polytetrafluoroethylene guide rail strip is provided on the lower end surface of the convex guide rail.

[0012] Secondly, the present invention provides a method for improving the accuracy of a high-speed CNC gantry guideway grinding machine, including adopting a separate design for the V-shaped guideway and the machine bed, and disassembling the overall V-shaped guideway into multiple V-shaped guideways, with each V-shaped guideway segment being guided and positioned on the machine bed through positioning grooves and guide positioning keys; and independently monitoring and intelligently controlling the temperature rise of each V-shaped guideway segment.

[0013] As a further technical solution, a temperature sensor is installed on each V-shaped guide rail to detect the temperature rise in real time. Two cooling channels are symmetrically arranged on each V-shaped guide rail. One end of the cooling channel is connected to the air inlet, which is connected to the solenoid valve through the air inlet pipe. The other end is connected to the exhaust port, which is connected to the air cooler through a pipeline. The temperature sensor, solenoid valve, and air cooler are all connected to the control system. All temperature sensors transmit the detected temperature to the control system in real time. When any detected temperature exceeds the set temperature, the control system starts the air cooler and opens the corresponding solenoid valve to connect the cooling air path. Cold air enters the cooling channel through the air inlet pipe and air inlet to quickly cool the V-shaped guide rail whose temperature rise exceeds the set temperature. When the corresponding detected temperature is lower than the set temperature, its corresponding solenoid valve closes. When all detected temperatures are lower than the set temperature, the air cooler shuts down.

[0014] The present invention, by adopting the above technical solution, can bring the following beneficial effects: (1) By adopting a separate design for the V-shaped guide rail and the bed, and designing the original integrated V-shaped guide rail into several thermally symmetrical segments, and using positioning grooves and positioning guide keys for guidance and positioning installation, this structural design can not only meet the processing and assembly process requirements, but also effectively solve the technical problem of deformation and twisting of the original V-shaped guide rail caused by sliding friction heating expansion (the original V-shaped guide rail extends along the length of the bed).

[0015] (2) By designing cooling channels and temperature sensors on each V-shaped guide rail, real-time and accurate temperature rise detection and intelligent control are achieved, ensuring that the temperature rise of each V-shaped guide rail is effectively controlled. This effectively solves the technical problem of excessive straightness and flatness deviation between the worktable surface and the guide rail of the key parts being machined due to heat-induced deformation and twisting on one side of the V-shaped guide rail in high-speed CNC gantry guide rail grinding machines. It also effectively solves the technical problem of grinding marks generated when the guide rail of the key parts is rapidly and precisely ground along the worktable movement direction in high-speed CNC gantry guide rail grinding machines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-speed CNC gantry guideway grinding machine precision improvement device of the present invention; Figure 2 This is a partial structural diagram of the high-speed CNC gantry guideway grinding machine precision improvement device of the present invention; Figure 3 for Figure 1 AA section view in the middle; Figure 4 This is a schematic diagram of the V-shaped guide rail of the present invention; Figure 5 This is a side view of the V-shaped guide rail of the present invention; Figure 6 This is a schematic diagram of the front cover of the present invention; Figure 7 This is a schematic diagram of the structure of the rear end cover of the present invention; Figure 8 This is a schematic diagram of the structure of an existing CNC gantry grinding machine; Figure 9 for Figure 8 Enlarged view of a section in the middle I area; Figure 10 for Figure 8 Enlarged view of part II in the image; In the diagram, 1. Bed, 2. Linear guide rail, 3. Guide positioning key, 4. V-shaped guide rail, 5. V-shaped surface, 6. Positioning groove, 7. Temperature sensor mounting hole, 8. Cooling channel, 801. Cooling through hole, 802. End cover, 803. Front end cover, 804. Front connecting groove, 805. Rear end cover, 806. Rear connecting groove, 9. Air inlet, 10. Exhaust outlet, 11. Air inlet pipe, 12. Solenoid valve, 13. Air cooler, 14. Temperature sensor, 15. Control system, 16. Internal threaded hole, 17. Countersunk hole, 18. Socket head bolt, 19. PTFE guide rail, 20. Worktable, 21. Guide rail block, 22. Convex guide rail, 23. Existing CNC gantry guide rail grinding machine, 24. Integrated V-shaped guide rail, 25. Left column, 26. Right column, 27. Crossbeam, 28. Left transverse slide plate, 29. Right transverse slide plate, 30. Left straight slide plate, 31. Right straight slide plate, 32. Horizontal grinding head, 33. Universal grinding head. Detailed Implementation

[0017] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] For ease of description, the words "up," "down," "left," "right," "front," and "back" appearing in this invention only indicate that they are consistent with the up, down, left, right, front, and back directions of the accompanying drawings themselves. They do not limit the structure and are merely for the purpose of facilitating the description of this invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0020] like Figures 1-7 As shown, this invention provides a high-speed CNC gantry grinding machine precision improvement device, including a bed 1, a left column 25 on one side of the bed, and a right column 26 on the other side. A crossbeam 27 is provided between the left column 25 and the right column 26. A left transverse slide plate 28 and a right transverse slide plate 29 are slidably mounted on the crossbeam 27. A left straight slide plate 30 is vertically slidable on the left transverse slide plate 28, and a right straight slide plate 31 is vertically slidable on the right transverse slide plate 29. A horizontal grinding head 32 is mounted on the left straight slide plate 30, and a universal grinding head 33 is mounted on the right straight slide plate 31. A linear guide rail 2 is provided on one side of the upper end of the bed 1, and a guide positioning key 3 integrated with the bed 1 is provided on the other side. The guide positioning key 3 is not only integrated with the bed but also designed along the entire length of the bed 1. Multiple V-shaped guide rails 4 are sequentially arranged along the length of the upper end of the bed 1. A worktable 20 is provided on the upper end of the linear guide rails 2 and the V-shaped guide rails 4. Breaking the existing integrated design concept of V-shaped guide rails, a segmented design is adopted. Each V-shaped guide rail 4 has a V-shaped surface 5 (sliding working surface) at the upper end and a positioning groove 6 at the lower end. Each V-shaped guide rail 4 is precisely installed on the bed 1 through the positioning groove 6 and the guide positioning key 3. The positioning groove 6 and the guide positioning key 3 not only play a role in precise positioning, but also restrict the installation position of each V-shaped guide rail 4 during installation. Two cooling channels 8 are symmetrically provided on the V-shaped guide rail 4 for cooling the V-shaped surface 5. One end of the cooling channel 8 is connected to the air inlet 9 and the other end is connected to the exhaust port 10. The air inlet 9 is connected to the solenoid valve 12 through the air inlet pipe 11. The solenoid valve 12 is connected to the air cooler 13 through the pipeline. Each V-shaped guide rail 4 is provided with a temperature sensor 14. The temperature sensor 14 is connected to the control system 15. The control system 15 is connected to the air cooler 13 and the solenoid valve 12 respectively. The control system here is preferably a PLC controller or integrated with the control system of the existing grinding machine.

[0021] This application addresses the key technical challenges of precision machining of critical components such as guideways and feed grinding marks in existing high-speed CNC gantry grinding machines that operate at sustained high speeds and reciprocating motions for extended periods. Based on the fundamental theory of thermal deformation due to metal temperature rise, and focusing on the structural characteristics of the bed and worktable of the high-speed CNC gantry grinding machine during sustained high-speed reciprocating motions, in-depth basic and applied research and technical breakthroughs were conducted. It was discovered that during sustained high-speed reciprocating motions of the high-speed CNC gantry grinding machine, the integrated V-shaped guideway 24 (existing V-shaped guideway structure) on the bed 1 undergoes sliding friction, heat generation, expansion, and deformation, resulting in torsion. This distortion affects the straightness and flatness accuracy of the worktable 20 surface, which is the root cause of the straightness, flatness deviations, and grinding marks on the guideways of critical components in high-speed precision grinding. Field measurements of the temperature rise of the integrated V-shaped guide rail 24 during actual sliding motion on an existing high-speed CNC gantry grinding machine confirmed that the root cause of this problem is the thermal deformation and twisting of the integrated V-shaped guide rail 24 caused by the continuous high-speed reciprocating sliding friction between the integrated V-shaped guide rail 24 on one side of the upper part of the machine bed and the convex guide rail 22 of the worktable 20. Therefore, simply adding an intelligent temperature rise control system to the V-shaped guide rail will not solve the significant technical challenges of not being able to accurately detect and intelligently control the temperature rise of the guide rail in different grinding strokes on existing high-speed CNC gantry grinding machines, as the integrated V-shaped guide rail 24 and the machine bed 1 are an integral structure.

[0022] Therefore, compared with the existing CNC gantry grinding machine 23, this application adopts a separate design for the V-shaped guide rail 4 and the bed 1, transforming the originally integrated V-shaped guide rail 24 into multiple segments. Positioning grooves 6 and positioning guide keys 3 are used for precise installation and guidance. This structural design not only meets the requirements of machining and assembly processes but also effectively solves the technical problem of deformation and twisting of the original V-shaped guide rail 24 due to sliding friction heating and expansion (the original V-shaped guide rail extends along the length of the bed). By designing cooling channels 8 and temperature sensors 14 on each segment of the V-shaped guide rail 4, real-time and accurate detection of the temperature rise of each segment of the V-shaped guide rail 4 is achieved, enabling intelligent control and ensuring effective control of the temperature rise of each segment. This invention effectively solves the technical problem of excessive straightness and flatness deviation between the worktable 20 and the guide rail of the key parts being processed due to the heat-induced deformation and twisting of the integrated V-shaped guide rail 24 on one side of the existing high-speed CNC gantry guide rail grinding machine. It also effectively solves the technical problem of grinding marks generated when the high-speed CNC gantry guide rail grinding machine rapidly and precisely grinds the guide rail of the key parts along the movement direction of the worktable 20.

[0023] The upper end of the bed 1 has an upwardly protruding guide positioning key 3, which is designed as a cuboid. The lower center of the V-shaped guide rail 4 has a recessed positioning groove 6, which is located on the guide positioning key 3. The specific shapes and installation positions of the guide positioning key 3 and the positioning groove 6 are given to further improve the guiding and positioning accuracy.

[0024] The depth of the positioning groove 6 is not equal to the height of the guide positioning key 3. That is, after the V-shaped guide rail 4 is installed on the bed 1, there is a gap between the guide positioning key 3 and the positioning groove 6 in the vertical direction. This ensures that the positioning groove 6 and the guide positioning key 3 only serve the functions of guiding and positioning (ensuring convenient and accurate installation without over-positioning), while the load is still borne by the bed 1.

[0025] The guide positioning key 3 has multiple internally threaded holes 16 evenly spaced along its length. Correspondingly, the V-shaped guide rail 4 has multiple countersunk holes 17 evenly spaced along its length. Each countersunk hole 17 contains a hexagon socket head cap screw 18, which secures the V-shaped guide rail 4 to the bed 1 by being installed in the internally threaded holes 16. The combination of the positioning groove 6 and the guide positioning key 3 ensures that the V-shaped guide rail 4 is accurately and reliably installed on the bed 1.

[0026] The cooling channel 8 includes a plurality of cooling through holes 801 evenly spaced along the V-shaped surface 5. The cooling through holes 801 are arranged along the length of the V-shaped guide rail 4. One end of the lower cooling through hole 801 is connected to the air inlet 9, and one end of the upper cooling through hole 801 is connected to the exhaust port 10. The air inlet 9 and the exhaust port 10 are arranged perpendicular to the length of the cooling through holes 801. End caps 802 are provided at both ends of the V-shaped guide rail 4. The inner side of each end cap 802 has a connecting groove that connects all the cooling through holes 801 in the same cooling channel 8. The specific structure of the cooling channel 8 is given to facilitate rapid and efficient cooling of the V-shaped surface 5. In practical applications, the position and size of the connecting groove 803 are determined by the position of the cooling through holes 801 to be connected. Typically, one connecting groove only needs to connect two adjacent cooling through holes 801. Specifically, as shown... Figure 4 As shown, a cooling channel 8 has three cooling through holes 801 evenly spaced, as... Figure 6 The front connecting groove 804 on the front end cover 803 shown connects the front ends of the two cooling through holes 801 located above it, as shown. Figure 7 The rear connecting groove 806 on the rear end cover 805 shown connects the rear ends of the two cooling through holes 801 located below.

[0027] The V-shaped guide rail 4 is provided with a temperature sensor mounting hole 7. The temperature sensor is mounted on the temperature sensor mounting hole 7, and the temperature sensor's sampling point is set close to the V-shaped surface 5 and away from the cooling through hole 801. This allows for accurate and reliable detection of the temperature rise of the V-shaped surface 5.

[0028] The lower end of the worktable 20 is mounted on a linear guide rail 2 via a guide rail block 21 on one side, and slidably mounted on a V-shaped guide rail 4 via a convex guide rail 22 on the other side. A polytetrafluoroethylene (PTFE) guide rail strip 19 is provided on the lower end surface of the convex guide rail 22. By designing the PTFE guide rail strip 19, a low-friction composite guide rail is achieved, which has the advantages of high wear resistance and low coefficient of friction, thereby significantly reducing the heat generated by friction.

[0029] This invention provides a method for improving the accuracy of a high-speed CNC gantry grinding machine, including a separate design of the V-shaped guide rail 4 and the bed 1, and the disassembly of the integrated V-shaped guide rail 24 into multiple V-shaped guide rail segments 4. Each V-shaped guide rail segment 4 is guided and positioned on the bed 1 by a positioning groove 6 and a guide positioning key 3; and the temperature rise of each V-shaped guide rail segment 4 is independently monitored and intelligently controlled.

[0030] Preferably, a temperature sensor 14 is installed on each V-shaped guide rail 4 to detect the temperature rise in real time. Two cooling channels 8 are symmetrically arranged on each V-shaped guide rail 4. One end of the cooling channel 8 is connected to the air inlet 9, which is connected to the solenoid valve 12 through the air inlet pipe 11. The other end is connected to the exhaust port 10. The solenoid valve 12 is connected to the air cooler 13 through a pipeline. In practical applications, one air cooler 13 can be shared. The air cooler 13 is connected to each of the solenoid valves 12 through an air source distributor. The temperature sensor 14, the solenoid valve 12, and the air cooler 13 are all connected together. Each temperature sensor 14 is connected to the control system 15. All temperature sensors 14 transmit the detected temperature to the control system 15 in real time. When any detected temperature exceeds the set temperature, the control system 15 starts the air cooler 13 and opens the corresponding solenoid valve 12 to connect the cooling air path. The cold air enters the cooling channel 8 through the air inlet pipe 11 and the air inlet hole 9 to quickly cool the V-shaped guide rail 4 whose temperature rise exceeds the set temperature. When the corresponding detected temperature is lower than the set temperature, the corresponding solenoid valve 12 is closed. When all detected temperatures are lower than the set temperature, the air cooler 13 is turned off.

[0031] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0032] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A precision-enhancing device for a high-speed CNC gantry grinding machine, characterized in that, The device includes a bed frame, with a linear guide rail on one side of the upper part and a guide positioning key integrated with the bed frame on the other side. Multiple V-shaped guide rails are sequentially arranged along the length of the upper part of the bed frame. A worktable is provided at the upper end of each linear and V-shaped guide rail. Each V-shaped guide rail has a V-shaped surface at the upper end and a positioning groove at the lower end. Each V-shaped guide rail is precisely installed on the bed frame through the positioning groove and the guide positioning key. Two cooling channels for cooling the V-shaped surface are symmetrically arranged on each V-shaped guide rail. One end of each cooling channel is connected to an air inlet, and the other end is connected to an exhaust outlet. The air inlet is connected to a solenoid valve through an air inlet pipe. The solenoid valve is connected to an air cooler through a pipeline. A temperature sensor is provided on each V-shaped guide rail. The temperature sensor is connected to a control system, which is connected to both the air cooler and the solenoid valve.

2. The high-speed CNC gantry grinding machine precision improvement device according to claim 1, characterized in that, The upper end of the bed is provided with the guide positioning key protruding upwards, and the guide positioning key is designed in the shape of a cuboid. The lower end of the V-shaped guide rail is provided with the positioning groove, which is set on the guide positioning key.

3. The high-speed CNC gantry grinding machine precision improvement device according to claim 2, characterized in that, The depth of the positioning groove is not equal to the height of the guide positioning key.

4. The high-speed CNC gantry grinding machine precision improvement device according to claim 3, characterized in that, The guide positioning key has multiple internal threaded holes evenly spaced along its length, and the corresponding V-shaped guide rail has multiple countersunk holes evenly spaced along its length. The countersunk holes are equipped with hexagonal socket bolts, which are installed on the internal threaded holes to fasten the V-shaped guide rail to the bed.

5. The high-speed CNC gantry grinding machine precision improvement device according to claim 1 or 4, characterized in that, The cooling channel includes a plurality of cooling through holes evenly distributed along the V-shaped surface. The cooling through holes are arranged along the length of the V-shaped guide rail. One end of the lower cooling through hole is connected to the air inlet, and one end of the upper cooling through hole is connected to the exhaust hole. The air inlet and exhaust hole are arranged perpendicular to the length of the cooling through holes. End caps are provided at both ends of the V-shaped guide rail. A connecting groove is provided on the inner side of the end cap to connect all the cooling through holes in the same cooling channel.

6. The high-speed CNC gantry grinding machine precision improvement device according to claim 5, characterized in that, The V-shaped guide rail is provided with a temperature sensor mounting hole, and the temperature sensor is mounted on the temperature sensor mounting hole. The temperature sensor's sampling point is set close to the V-shaped surface and away from the cooling through hole.

7. The high-speed CNC gantry grinding machine precision improvement device according to claim 6, characterized in that, The lower end of the workbench is mounted on a linear guide rail on one side via a guide rail block, and slidably mounted on a V-shaped guide rail on the other side via a convex guide rail. A polytetrafluoroethylene guide rail strip is provided on the lower end surface of the convex guide rail.

8. A method for improving the accuracy of a high-speed CNC gantry rail grinding machine, characterized in that, This includes a separate design for the V-shaped guide rail and the bed frame, and the disassembly of the integrated V-shaped guide rail into multiple V-shaped guide rail segments. Each segment of the V-shaped guide rail is precisely installed on the bed frame through positioning grooves and guide positioning keys. The temperature rise of each segment of the V-shaped guide rail is independently monitored and intelligently controlled.

9. The method for improving the accuracy of a high-speed CNC gantry rail grinding machine according to claim 8, characterized in that, Temperature sensors are installed on each V-shaped guide rail to detect temperature rise in real time. Two cooling channels are symmetrically arranged on each V-shaped guide rail. One end of the cooling channel is connected to the air inlet, which is connected to the solenoid valve through the air inlet pipe. The other end is connected to the exhaust port, which is connected to the air cooler through a pipeline. The temperature sensors, solenoid valves, and air coolers are all connected to the control system. All temperature sensors transmit the detected temperature to the control system in real time. When any detected temperature exceeds the set temperature, the control system starts the air cooler and opens the corresponding solenoid valve to connect the cooling air path. Cold air enters the cooling channel through the air inlet pipe and air inlet to quickly cool the V-shaped guide rail whose temperature rise exceeds the set temperature. When the corresponding detected temperature is lower than the set temperature, its corresponding solenoid valve closes. When all detected temperatures are lower than the set temperature, the air cooler shuts down.

Images