Linear motor driven high-rigidity gantry frame type machine tool

Abstract

The utility model discloses a kind of high rigidity gantry frame type machine tools of linear motor drive, comprising: bed, top surface both sides are provided with high rigidity roller guide, high rigidity roller guide between both sides is provided with Y-axis linear motor;Workbench, set in the output end of Y-axis linear motor, the bottom surface both sides of workbench are provided with first slider;Gantry frame, including stand, beam is set between stand, beam has first step surface and second step surface, first step surface and second step surface are provided with X-axis guide rail, beam is provided with X-axis linear motor;Milling head slide, bottom is provided with third step surface and fourth step surface, second slider is respectively provided in third step surface and fourth step surface, the front side of milling head slide is provided with Z-axis linear motor;Spindle box component, set in the output end of Z-axis linear motor.The utility model comprehensively solves the problems of synchronous control, structural deformation and thermal accumulation of linear motor gantry machine tool.

Description

Technical Field

[0001] This utility model relates to the field of machine tool equipment, and in particular to a high-rigidity gantry frame machine tool driven by a linear motor. Background Technology

[0002] Currently, gantry milling machines generally use lead screw drives to power each motion axis, which suffers from problems such as long transmission chains, slow response, and decreased accuracy due to mechanical wear. While gantry milling machines using linear motor direct drives can increase speed, they face three main drawbacks:

[0003] 1. Poor synchronization: When the Y-axis dual motor drives the worktable, uneven load can easily cause skewing.

[0004] II. Insufficient rigidity: The bending deformation of the crossbeam during high-speed movement and the clearance of the guide rails affect the stability of the machining process;

[0005] Third, lack of thermal management: The continuous high-speed operation of the linear motor generates cumulative temperature rise, causing thermal displacement errors. Current technology has not systematically solved the above problems in a single structure. Utility Model Content

[0006] The purpose of this invention is to provide a high-rigidity gantry frame machine tool driven by a linear motor to solve the above-mentioned problems.

[0007] According to one aspect of this utility model, a high-rigidity gantry frame machine tool driven by a linear motor is provided, comprising: a bed, with high-rigidity roller guides respectively arranged on both sides of the top surface, and a Y-axis linear motor arranged between the two sides of the high-rigidity roller guides; a worktable, disposed at the output end of the Y-axis linear motor, with first sliders slidably engaged with the high-rigidity roller guides on both sides of the bottom surface of the worktable; a gantry frame, including columns disposed on both sides of the top surface of the bed, with a crossbeam arranged between the two sides of the columns, the crossbeam having a first stepped surface and a second stepped surface, both the first stepped surface and the second stepped surface being provided with X-axis guides, and an X-axis linear motor being disposed on the crossbeam; a milling head slide, with a third stepped surface and a fourth stepped surface at the bottom, the third stepped surface and the fourth stepped surface respectively corresponding to the X-axis guides being provided with second sliders, and a Z-axis linear motor being disposed on the front side of the milling head slide; and a spindle box assembly, disposed at the output end of the Z-axis linear motor.

[0008] In some embodiments, the Y-axis linear motor is a symmetrical dual-drive structure, including two sets of linear motor stators fixed parallel to both sides of the bed and a mover connected to the bottom surface of the worktable; a grating ruler closed-loop feedback system is provided between the two sets of Y-axis linear motors to monitor the displacement difference between the two drives in real time and compensate synchronously.

[0009] In some embodiments, the high-rigidity roller guide is a bidirectional preloaded roller guide; the first slider is provided with a self-lubricating composite liner, and the surface of the self-lubricating composite liner has oil storage micropores.

[0010] In some embodiments, both the columns and beams are provided with a honeycomb-shaped array of reinforcing holes.

[0011] In some embodiments, the X-axis guide rail is locked to the first and second steps of the crossbeam by wedge-shaped pressure blocks.

[0012] In some embodiments, a temperature sensor is integrated into the stator base of the Z-axis linear motor; the milling head slide is provided with an air-cooling channel, the outlet of which is aligned with the Z-axis linear motor.

[0013] In some embodiments, the air-cooling channel includes a high-pressure centrifugal fan, which is disposed on the rear side of the milling head slide. The milling head slide has an air distribution chamber inside, the air inlet of which is connected to the high-pressure centrifugal fan, and the air outlet is provided with a nozzle facing the Z-axis linear motor. The temperature sensor is signal-connected to the high-pressure centrifugal fan.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This invention eliminates the skew phenomenon of the worktable caused by the asynchronous operation of the dual drives through the coordinated control of the Y-axis linear motor and the closed-loop feedback system of the grating ruler, ensuring dynamic positioning accuracy during large-stroke movements. The composite design of roller guides and self-lubricating pads enhances the rigidity of the worktable while significantly reducing friction loss, avoiding the gap drift problem caused by wear of traditional guides. The honeycomb-shaped reinforcing hole array inside the gantry frame greatly suppresses structural vibration during high-speed reciprocating motion, ensuring the stability of the milling process. The Z-axis linear motor with integrated temperature sensor and air-cooling channel achieves precise temperature control of the motor air gap area, effectively blocking the path of thermal deformation to the spindle box, comprehensively solving the problems of synchronous control, structural deformation and heat accumulation in linear motor gantry milling machines. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the rear view structure of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] refer to Figures 1 to 2 This application provides a high-rigidity gantry frame machine tool driven by a linear motor, comprising: a bed 1, with high-rigidity roller guides 2 respectively arranged on both sides of the top surface, and a Y-axis linear motor arranged between the two high-rigidity roller guides 2; a worktable 3, disposed at the output end of the Y-axis linear motor, with first sliders 4 arranged on both sides of the bottom surface of the worktable 3 to slide in cooperation with the high-rigidity roller guides 2; and a gantry frame, including columns 5 disposed on both sides of the top surface of the bed 1, and a crossbeam 6 arranged between the two columns 5. The crossbeam 6 has a first stepped surface 7 and a second stepped surface 8, both of which are provided with X-axis guide rails 9. The crossbeam 6 is equipped with an X-axis linear motor. The milling head slide 10 has a third stepped surface 11 and a fourth stepped surface 12 at its bottom. The third stepped surface 11 and the fourth stepped surface 12 are respectively provided with second sliders corresponding to the X-axis guide rails 9. The front side of the milling head slide 10 is equipped with a Z-axis linear motor 13. The spindle box component is located at the output end of the Z-axis linear motor 13.

[0020] The design of the stepped surface connecting the milling head slide 10 (i.e., "the crossbeam 6 has a first stepped surface 7 and a second stepped surface 8, and the bottom of the milling head slide 10 is provided with a third stepped surface 11 and a fourth stepped surface 12") achieves the following core advantages through a stepped multi-level contact structure: When the milling head slide 10 moves at high speed, the cutting force in the Z direction of the spindle box generates an overturning moment. The single-plane guide rail is prone to vibration due to moment imbalance. The first stepped surface 7 and the third stepped surface 11 resist the clockwise overturning moment, and the second stepped surface 8 and the fourth stepped surface 12 resist the counterclockwise overturning moment, forming a couple balance system, and the overturning stiffness is increased to more than twice that of the single-plane structure.

[0021] In some embodiments, the Y-axis linear motor is a symmetrical dual-drive structure, including two sets of linear motor stators fixed parallel to both sides of the bed 1 and a mover connected to the bottom surface of the worktable 3; a grating ruler closed-loop feedback system is provided between the two sets of Y-axis linear motors to monitor the displacement difference between the two drives in real time and compensate synchronously.

[0022] In some embodiments, the high-rigidity roller guide 2 is a bidirectional preloaded roller guide; the first slider 4 is provided with a self-lubricating composite liner, and the surface of the self-lubricating composite liner has oil storage micropores.

[0023] In some embodiments, both the column 5 and the crossbeam 6 are provided with a honeycomb-shaped reinforcing hole array.

[0024] In some embodiments, the X-axis guide rail 9 is locked onto the first step surface 7 and the second step surface 8 of the crossbeam 6 by wedge-shaped pressure blocks.

[0025] In some embodiments, a temperature sensor is integrated into the stator base of the Z-axis linear motor 13; the milling head slide 10 is provided with an air-cooling channel, the outlet of which is aligned with the Z-axis linear motor 13.

[0026] In some embodiments, the air-cooling channel includes a high-pressure centrifugal fan, which is disposed on the rear side of the milling head slide 10. The milling head slide 10 has an air distribution chamber inside, the air inlet of which is connected to the high-pressure centrifugal fan, and the air outlet is provided with a nozzle facing the Z-axis linear motor 13; the temperature sensor is signal-connected to the high-pressure centrifugal fan.

[0027] This invention eliminates the skew phenomenon of the worktable 3 caused by the asynchronous operation of the dual drives through the coordinated control of the Y-axis linear motor and the closed-loop feedback system of the grating ruler, ensuring dynamic positioning accuracy during large-stroke movement. The composite design of roller guides and self-lubricating pads enhances the rigidity of the worktable 3 while significantly reducing friction loss, avoiding the gap drift problem caused by wear of traditional guides. The honeycomb-shaped reinforcing hole array inside the gantry frame greatly suppresses structural vibration during high-speed reciprocating motion, ensuring the stability of the milling process. The Z-axis linear motor 13 with integrated temperature sensor and air-cooling channel achieves precise temperature control of the motor air gap area, effectively blocking the path of thermal deformation to the spindle box, comprehensively solving the problems of synchronous control, structural deformation and heat accumulation in linear motor gantry machine tools.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-rigidity gantry frame machine tool driven by a linear motor, characterized in that, include: The bed has high-rigidity roller guides on both sides of the top surface, and a Y-axis linear motor is installed between the two high-rigidity roller guides on both sides. The worktable is located at the output end of the Y-axis linear motor, and the bottom surface of the worktable is provided with first sliders that slide in cooperation with the high-rigidity roller guide rail on both sides. The gantry frame includes columns on both sides of the top surface of the bed, and a crossbeam between the columns on both sides. The crossbeam has a first step surface and a second step surface. Both the first step surface and the second step surface are provided with X-axis guide rails. The crossbeam is equipped with an X-axis linear motor. The milling head slide has a third-level surface and a fourth-level surface at the bottom. The third-level surface and the fourth-level surface are respectively provided with second sliders corresponding to the X-axis guide rail. A Z-axis linear motor is provided on the front side of the milling head slide. The spindle box component is located at the output end of the Z-axis linear motor.

2. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 1, characterized in that, The Y-axis linear motor has a symmetrical dual-drive structure, including two sets of linear motor stators fixed in parallel on both sides of the bed and a mover connected to the bottom surface of the worktable; A closed-loop feedback system with a grating ruler is set between the two sets of Y-axis linear motors to monitor the displacement difference between the two drives in real time and compensate synchronously.

3. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 1, characterized in that, The high-rigidity roller guide is a bidirectional pre-tightened roller guide; the first slider is provided with a self-lubricating composite liner, and the surface of the self-lubricating composite liner has oil storage micropores.

4. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 1, characterized in that, Both the columns and beams are equipped with a honeycomb-shaped array of reinforcing holes.

5. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 1, characterized in that, The X-axis guide rail is locked to the first and second steps of the crossbeam by wedge-shaped pressure blocks.

6. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 1, characterized in that, The stator base of the Z-axis linear motor integrates a temperature sensor; the milling head slide is provided with an air-cooling channel, and the outlet of the air-cooling channel is aligned with the Z-axis linear motor.

7. The high-rigidity gantry frame machine tool driven by a linear motor according to claim 6, characterized in that, The air-cooling channel includes a high-pressure centrifugal fan, which is located on the rear side of the milling head slide. The milling head slide has an air distribution chamber inside, the air inlet of which is connected to the high-pressure centrifugal fan, and the air outlet is provided with a nozzle facing the Z-axis linear motor. The temperature sensor is connected to the high-pressure centrifugal fan.

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