Horizontal machining center and high-low track modeling method

Abstract

The invention relates to the field of machine tools, in particular to a horizontal machining center and a high-low track modeling method.The horizontal machining center comprises a base, a stand column, a spindle box, a sliding saddle, a high track and a low track, the spindle box moves front and back relative to the sliding saddle, and the sliding saddle moves up and down relative to the stand column; any mass center point in the range formed in the whole moving process of a combination formed by the spindle box and the sliding saddle is perpendicular to the plane of the high track or the low track, the perpendicular bisector of the track line segment penetrates through the mass center range, the high-low track design mode enables the stand column to be stressed more evenly, and the machining stability of a machine tool is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machine tools, in particular to a horizontal machining center and a modeling method of high-low rail. BACKGROUND

[0002] At present, high-low rail design is generally adopted on the base of the horizontal machining center, and the column moves on the high-low rail. However, the high-low degree of the high-low rail of different machine tools is slightly different, and there is no uniform standard for the spacing and height difference of the high-low rail. The high-low rail is mostly designed according to the experience of engineering designers. In this way, the stability of the movement of the column on the high-low rail cannot be guaranteed, thereby affecting the machining accuracy of the machine tool. SUMMARY

[0003] To solve the above problems, the purpose of the present application is to provide a horizontal machining center and a modeling method of high-low rail, the centroid of the combination of the spindle box and the saddle is perpendicular to the connecting line between the high rail and the low rail, so that the movement of the column on the high-low rail is more stable.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] The horizontal machining center provided by the present application comprises a base, a column, a spindle box and a saddle. The base is provided with a high rail and a low rail parallel to each other. The column is movably arranged on the high rail and the low rail along the X-axis direction. The saddle is movably arranged on the column along the Z-axis direction. The spindle box is movably arranged on the saddle along the Y-axis direction. The characteristic is that the stroke of the saddle moving on the column is equal to the upper half interval and the lower half interval. During the forward and backward movement of the spindle box relative to the saddle along the Y-axis direction and the upward and downward movement of the saddle relative to the column along the Z-axis direction in the upper half interval, all the centroid points of the combination of the spindle box and the saddle form a centroid point range. The connecting line between the high rail and the low rail is a rail segment on the vertical plane perpendicular to the high rail or the low rail at any centroid point in the centroid point range. The middle perpendicular line of the rail segment passes through the centroid point range.

[0006] In an embodiment, when the saddle is located at a position state where the saddle is at one quarter of the stroke of the saddle and away from the base, the spindle box is moved forward and backward along the Y-axis direction to the maximum displacement respectively, and the first centroid point and the second centroid point of the combination are obtained correspondingly. The midpoint of the first centroid point and the second centroid point is taken as the first central centroid point. The perpendicular point of the first central centroid point to the perpendicular line of the rail segment is located between one quarter and three quarters of the rail segment.

[0007] In an embodiment, the middle perpendicular line of the rail segment bisects the centroid range; or / and,

[0008] In the state that the saddle is moved upward to the maximum displacement along the Z-axis direction relative to the column, and the spindle box is moved backward to the maximum displacement along the Y-axis direction relative to the saddle, the vertical point of the center of mass of the combination and the track line segment is located on the end point of the track line segment close to the high track.

[0009] In an embodiment, in the state that the center of mass of the combination is located at the first central center of mass, the saddle is moved upward to the maximum displacement and to the position of one half of the saddle stroke, respectively, to obtain the third center of mass and the fourth center of mass, and the vertical points of the third center of mass and the fourth center of mass to the vertical line of the track line segment are located between one fourth and three fourths of the track line segment.

[0010] In an embodiment, the center of mass range is located between the vertical plane where the high track is located and the vertical plane where the low track is located, and the perpendicular bisector of the track line segment and the boundary of the center of mass range have at least two intersection points.

[0011] In an embodiment, a sliding block is arranged on the saddle, a first track is arranged on the sliding block, a second track is arranged on the spindle box, and the spindle box slides on the first track through the second track;

[0012] The first track is a concave track arranged on the sliding block, the second track is a linear track arranged on the spindle box, and the linear track is fitted in the concave track; the linear track is symmetrically arranged with the center line of the spindle box in the width direction.

[0013] A modeling method of high and low tracks of a horizontal machining center, the horizontal machining center comprising a base, a column, a spindle box and a saddle, the high and low tracks comprising a high track and a low track arranged on the base and parallel to each other, the column being movably arranged on the high track and the low track along the X-axis direction, the saddle being movably arranged on the column along the Z-axis direction, and the spindle box being movably arranged on the saddle along the Y-axis direction, the modeling method comprising the following steps:

[0014] When the saddle is moved upward to the maximum displacement and downward to the intermediate position relative to the column, respectively, the spindle box is moved forward and backward relative to the saddle along the Y-axis direction, in the process of moving the spindle box, a first center of mass of a combination of the spindle box and the saddle is generated, and the distance between the high track and the low track in the horizontal direction is adjusted, so that the first combined center of mass is located between the vertical plane where the high track is located and the vertical plane where the low track is located.

[0015] When the spindle head is moved forward and backward to the maximum displacement relative to the saddle, the saddle is moved up and down relative to the column along the Z-axis direction between the middle position of the stroke and the maximum displacement, and the second center of mass of the combination of the spindle head and the saddle is generated during the movement of the saddle, the first center of mass and the second center of mass form a center of mass range; the height difference between the high rail and the low rail is adjusted so that any center of mass in the center of mass range is perpendicular to the vertical plane of the high rail or the low rail, the connecting line between the high rail and the low rail is a rail segment, the middle perpendicular line of the rail segment passes through the center of mass range, and at least one set of spacing and / or height difference between the low rail and the high rail is recorded as the rail design spacing and / or the rail design height difference.

[0016] In an embodiment, the saddle is moved to a position of one quarter of the stroke of the saddle, and the saddle is located away from the base on one side;

[0017] The spindle head is moved forward and backward along the Y-axis direction to the maximum displacement, and the first and second centers of mass of the combination are correspondingly obtained, the midpoint of the first and second centers of mass is taken as the first central center of mass, the perpendicular line between the first central center of mass and the rail segment is the first central line, the perpendicular point of the first central line is located between one quarter and three quarters of the rail segment by adjusting the spacing and / or height difference between the high rail and the low rail, and at least one set of spacing and / or height difference between the low rail and the high rail is recorded as the rail design spacing and / or the rail design height difference.

[0018] In an embodiment, the perpendicular point of the first central line is located at the midpoint of the rail segment, and the spacing between the low rail and the high rail at this time is recorded as the rail design spacing.

[0019] In an embodiment, in the middle state of the spindle head stroke;

[0020] When the saddle is moved up along the Z-axis direction to the maximum displacement, the third center of mass of the combination is obtained, and when the saddle is moved down to the middle position of the stroke, the fourth center of mass of the combination is obtained, the midpoint of the third and fourth centers of mass is taken as the second central center of mass, the perpendicular point of the second central center of mass to the rail segment is located between one quarter and three quarters of the rail segment by adjusting the rail design spacing and / or height difference of the low rail or the high rail, and at least one set of spacing and / or height difference between the low rail and the high rail is recorded as the rail design spacing and / or the rail design height difference.

[0021] The beneficial effect of the present application is that the main shaft box moves forward and backward relative to the slide saddle, the slide saddle moves up and down relative to the column, any center of mass point in the range of the center of mass points formed during the entire movement of the combination of the main shaft box and the slide saddle is perpendicular to the plane of the high rail or the low rail, the middle line of the rail segment, and the center of mass range is passed through, and the high-low rail design makes the column force more balanced and ensures the stability of the machine tool processing. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0023] Figure 1 is a structural schematic view of the horizontal machining center of the present application;

[0024] Figure 2 is another structural schematic view of the horizontal machining center of the present application;

[0025] Figure 3 is a result schematic view of the slide saddle of the present application;

[0026] Figure 4 is a high-low rail stress analysis diagram of the present application;

[0027] Figure 5 is a flowchart of the modeling method of the horizontal machining center of the present application.

[0028] Wherein the reference signs are: 1-base, 2-column, 3-main shaft box, 4-slide saddle, 5-high rail, 51-high rail vertical plane, 6-low rail, 61-low rail vertical plane, 7-first center of mass point, 8-rail segment, 9-first center line, 10-sliding block, 11-second rail, 12-first center of mass point, 13-second center of mass point, 14-third center of mass point, 15-fourth center of mass point, 16-center of mass point range, 17-upper half interval. DETAILED DESCRIPTION

[0029] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0030] Reference Figure 1 , Figure 2 and Figure 4The embodiment of the application discloses a horizontal machining center, which comprises a base 1, a column 2, a spindle box 3 and a slide saddle 4. The base 1 is provided with a high rail 5 and a low rail 6 which are parallel to each other. The column 2 is movably arranged on the high rail 5 and the low rail 6 along the X-axis direction. The slide saddle 4 is movably arranged on the column 2 along the Z-axis direction. The spindle box 3 is movably arranged on the slide saddle 4 along the Y-axis direction. The stroke of the slide saddle 4 on the column 2 is equal to an upper half interval 17 and a lower half interval. During the movement of the spindle box 3 relative to the slide saddle 4 along the Y-axis direction and the movement of the slide saddle 4 relative to the column 2 along the Z-axis direction on the upper half interval 17, all the center of mass points of the combination of the spindle box 3 and the slide saddle 4 form a center of mass point range 16. Further, the center of mass point range 16 is located between a vertical plane (a high rail vertical plane 51) where the high rail 5 is located and a vertical plane (a low rail vertical plane 61) where the low rail 6 is located. The middle line of the rail line segment 8 and the boundary of the center of mass range have at least two intersection points. On the plane perpendicular to the high rail 5 or the low rail 6 through any center of mass point of the center of mass point range 16, the vertical point of the center of mass point to the line segment between the high rail 5 and the low rail 6 is located on the rail line segment 8 between the high rail 5 and the low rail 6. The rail line segment 8 is a virtual line segment between the high rail 5 and the low rail 6. The middle line of the rail line segment 8 passes through the center of mass range.

[0031] The application moves the spindle box 3 on the slide saddle 4 along the Y-axis direction respectively, then moves the slide saddle 4 to move up and down. The center of mass point range 16 formed during the whole movement of the combination of the spindle box and the slide saddle is located between the vertical plane (the high rail vertical plane 51) where the high rail 5 is located and the vertical plane (the low rail vertical plane 61) where the low rail 6 is located. Any center of mass point is perpendicular to the plane of the high rail 5 or the low rail 6. Meanwhile, the vertical point of all the center of mass points to the line segment between the high rail 5 and the low rail 6 (the rail line segment 8) is located on the line segment between the high rail 6 and the low rail 6. The middle line of the rail line segment 8 passes through the center of mass range. The center of mass point of the combination of the application to the high-low rail (including the line segment between the high rail 5 and the low rail which is perpendicular to the rail line segment 8, the middle line of the rail line segment 8 passes through the center of mass range) makes the column bear force more balanced and ensures the stability of the machine tool processing. Figure 5 According to the force analysis of the column 2, the resultant force of the high-low rail points to the first center of mass point 7. At this time, the high-low rail can provide stable support force for the column 2.

[0032] Further, referring to Figure 1 and Figure 2 When the slide saddle 4 moves upward relative to the column 2 along the Z-axis direction to the maximum displacement, and the spindle box 3 moves backward relative to the slide saddle 4 along the Y-axis direction to the maximum displacement, the vertical point of the center of mass point of the combination to the rail line segment 7 is located on the endpoint of the rail line 7 on the side of the high rail.

[0033] In an embodiment, referring to Figure 1 , the perpendicular bisector of the track segment 8 bisects the center of mass range.

[0034] In an embodiment, referring to Figure 1 and Figure 2 , during the movement of the spindle head 3 relative to the saddle 4 along the Y-axis direction and the movement of the saddle 4 relative to the column 2 along the Z-axis direction on the upper half interval 17, the center of mass point of the combination of the spindle head 3 and the saddle 4 forms a center of mass point range 16, which specifically includes:

[0035] In the position state where the saddle 4 is located at a quarter of the saddle stroke and away from the base on one side, the spindle head 1 is moved forward and backward along the Y-axis direction to the maximum displacement, respectively, and the first center of mass point 7 is obtained by taking the midpoint of the first center of mass point 12 and the second center of mass point 13, wherein the first center line 9 is formed between the first center of mass point and the track segment 8, and the first center line 9 is perpendicular to the track segment 8, so that the perpendicular point of the first center of mass point 7 to the perpendicular line of the track segment 8 is located between a quarter and three quarters of the track segment 8.

[0036] Specifically, in actual work, the lower end of the column 2 is generally relatively stable, so when calculating the upper and lower rails through the center of mass point, it is generally not necessary to move the saddle 4 downward to the maximum displacement of its stroke. In order to facilitate the design of the upper and lower rails, the saddle stroke is divided into equal upper and lower two sections, the saddle is located at the middle position of the upper half section, and then the spindle head is moved forward and backward to the maximum displacement, respectively, to obtain the first center of mass point and the second center of mass point, and then the first center of mass point is obtained. In order to ensure that the upper and lower rails provide better support force for the column, the present application draws a center line (the first center line 9) from the first center of mass point to the connecting line (the track segment 8) between the upper and lower rails, so that the first center line 9 is perpendicular to the connecting line between the upper and lower rails. The perpendicular point of the first center of mass point 7 to the track segment 8 is located at the midpoint of the track segment 8, that is, the first center line 9 is perpendicular to the midpoint position of the track segment 8, referring to Figure 2 , so that the upper and lower rails provide more stable support force for the column 2.

[0037] In an embodiment, referring to Figure 1 and Figure 2 , during the movement of the spindle head 3 relative to the saddle 4 along the Y-axis direction and the movement of the saddle 4 relative to the column 2 along the Z-axis direction on the upper half interval 17, the center of mass point of the combination of the spindle head 3 and the saddle 4 forms a center of mass point range 16, which specifically further includes:

[0038] In the state that the center of mass of the combination is located at the first center of mass 7, the slide saddle 4 is moved up to the maximum displacement and to the position of one-half of the slide saddle 4 stroke, respectively, to obtain the third center of mass 14 and the fourth center of mass 15, the perpendicular points of the third center of mass 14 and the fourth center of mass 15 to the perpendicular line of the track line segment 8 are located between one-quarter and three-quarters of the track line segment 8. Further, the midpoint of the third center of mass 14 and the fourth center of mass 15 is taken as the second center of mass, and the second center of mass to the track line segment forms a virtual second center line, and the second center line is perpendicular to the track line segment 8.

[0039] In order to ensure that the high-low rail provides better support force for the stand column 2, the present application draws a center line from the second center of mass to the connecting line between the high-low rail, that is, the second center line, and the second center line is perpendicular to the track line segment 8 between the high-low rail. In order to further provide stable support force for the stand column 2, the second center of mass coincides with the first center of mass 7, and the first center of mass 7 is located at the midpoint of the third center of mass 14 and the fourth center of mass 15. Figure 5 So that the high-low rail resultant force points to the first center of mass.

[0040] In an embodiment, referring to Figure 1 and Figure 3 , the slide saddle 4 is provided with a slide block 10, the slide block 10 is provided with a first track, and the main shaft box 3 is provided with a second track 11, and the main shaft box 3 slides on the first track through the second track 11. In the prior art, the slide block 10 is usually arranged on the main shaft box 3, which will affect the balance of the main shaft box 3. In the present embodiment, the slide block 10 is arranged on the slide saddle 4, and since the slide saddle 4 moves up and down, the weight of the slide block 10 will not have too much impact on it, which is beneficial to the balance of the main shaft box 3 or the entire stand column 2.

[0041] Further, referring to Figure 1 and Figure 3 , the first track is a concave track arranged on the slide block 10, and the second track 11 is a linear track arranged on the main shaft box 3, and the linear track fits in the concave track. The linear track is symmetrically arranged with the center line of the main shaft box 3 in the width direction, and the linear track is distributed on both sides of the center line of the main shaft box 3, avoiding the imbalance of the weight of the main shaft box 3 caused by arranging the linear track on one side of the main shaft box 3 or deviating to one side of the main shaft box 3.

[0042] In another embodiment, referring to Figure 1 , Figure 2 and Figure 5The application provides a modeling method for high-low rails of a horizontal machining center, the horizontal machining center comprising a base 1, a column 2, a spindle box 3 and a slide saddle 4, the high-low rails comprising a high rail 5 and a low rail 6 arranged on the base 1 and parallel to each other, the column 2 being arranged on the high rail 5 and the low rail 6 and movable along the X-axis direction, the slide saddle 4 being arranged on the column 2 and movable up and down along the Z-axis direction, and the spindle box 3 being arranged on the slide saddle 4 and movable along the Y-axis direction, the modeling method comprising the following steps:

[0043] S100: moving the spindle box 3 forward and backward along the Y-axis direction relative to the slide saddle 4 when the slide saddle 4 is moved upward to the maximum displacement and downward to the intermediate position displacement relative to the column 2 respectively, moving the spindle box 3 forward and backward along the Y-axis direction relative to the slide saddle 4, generating a first center point group of a combination of the spindle box 3 and the slide saddle 4 during the movement of the spindle box 3, and adjusting the distance between the high rail 5 and the low rail 6 in the horizontal direction so that all the first center points are located between the vertical plane where the high rail 5 is located and the vertical plane where the low rail 6 is located;

[0044] S200: moving the slide saddle 4 up and down along the Z-axis direction relative to the column 2 between the intermediate position and the maximum upward displacement in the stroke when the spindle box 3 is moved forward and backward to the maximum displacement relative to the slide saddle 4 respectively, generating a second center point group of the combination of the spindle box 3 and the slide saddle 4 during the movement of the slide saddle 4, the first center point group and the second center point group forming a center point range 16, adjusting the height difference between the high rail 5 and the low rail 6 so that any center point in the center point range 16 is perpendicular to the vertical plane of the high rail 5 or the low rail 6, the line segment 8 between the high rail 5 and the low rail 6 is a rail line segment 8, the middle perpendicular line of the rail line segment 8 passes through the center point range 16, and at least one set of the distance and / or the height difference between the low rail 6 and the high rail 5 is recorded as the rail design distance and / or the rail design height difference.

[0045] The application moves the spindle box 3 forward and backward along the Y-axis direction on the slide saddle 4 respectively, then moves the slide saddle 4 up and down, and generates the center point range 16 of the combination of the spindle box 3 and the slide saddle 4 during the whole movement, which is located between the vertical plane where the high rail 5 is located and the vertical plane where the low rail 6 is located, and any center point is perpendicular to the plane of the high rail 5 or the low rail 6, and the perpendicular point of all the center points to the line between the high rail 5 and the low rail 6 (the rail line segment 8) is located on the line segment between the high rail 5 and the low rail 6. The perpendicular line of the center point of the combination to the high-low rail (including the high rail 5 and the low rail 6) is perpendicular to the rail line segment 8, and this kind of high-low rail design makes the force on the column 2 more balanced and ensures the stability of the machine tool processing. Figure 5 According to the force analysis of the column 2, the resultant force of the high-low rail points to the first center point 7, and at this time, the high-low rail can provide stable support force for the column 2.

[0046] In an embodiment, referring to Figure 1 and Figure 2 , step S100 specifically comprises:

[0047] S101: moving the saddle 4 to a position of one quarter of the stroke of the saddle 4, and the saddle 4 is located away from the base 1;

[0048] S102: moving the spindle box 1 forward and backward along the Y-axis direction respectively to the maximum displacement, corresponding to obtaining the first center of mass point 12 and the second center of mass point 13 of the combination, taking the midpoint of the first center of mass point 12 and the second center of mass point 13 as the first center of mass point 7, and the perpendicular line between the first center of mass point 7 and the track line segment 8 is the first center line 9, by adjusting the distance and / or height difference between the high track 5 and the low track 6, the perpendicular point of the first center line 9 is located between one quarter and three quarters of the track line segment 8, and at least one set of distance and / or height difference between the low track 6 and the high track 5 is recorded as the track design distance and / or the track design height difference.

[0049] Specifically, in actual work, the lower end part of the column 2 is generally more stable, so the stroke of the saddle 4 is divided into equal upper and lower two parts, and when calculating the height of the high and low tracks through the center of mass point, the saddle 4 does not need to be moved to the maximum displacement of its stroke, but is moved to the middle position of its stroke, that is, to the fourth center of mass point 15.

[0050] The present application moves the saddle 4 to the middle position of the upper half of the stroke of the column 2, and then moves the spindle box 3 forward and backward along the saddle 4 to the maximum displacement respectively, obtains the first center of mass point 7 according to the maximum forward and backward displacement, continuously changes the distance position of the high and low tracks, until the first center line 9 is perpendicular to the track line segment 8, and the distance between the high track 5 and the low track 6 at this time is regarded as the track design distance. Further, during the adjustment process of the high and low tracks, the position of the low track 6 can be kept unchanged to adjust the position of the high track 5, or the position of the high track 5 can be kept unchanged to adjust the position of the low track 6.

[0051] Further, referring to Figure 1 and Figure 2 , the first center line 9 is perpendicular to the track line segment 8, and the perpendicular point is located at the midpoint of the track line segment 8, and the distance between the low track 6 and the high track 5 at this time is recorded as the track design distance, so that the high and low tracks provide more stable support force for the column 2.

[0052] In an embodiment, referring to Figure 1 and Figure 2 , step S200 comprises:

[0053] In the middle state of the stroke of the spindle box 3;

[0054] The third center of mass point of the combination is obtained when the slide 4 is moved upward along the Z-axis direction to the maximum displacement, the fourth center of mass point of the combination is obtained when the slide 4 is moved downward to the middle position of the slide stroke, the midpoint of the third center of mass point and the fourth center of mass point is taken as the second center of mass point, the track design spacing and / or the height difference between the low track 6 and the high track 5 is adjusted so that the perpendicular point from the second center of mass point to the track line segment 8 is located between one fourth and three fourths of the track line segment 8, and at least one set of the spacing and / or the height difference between the low track 6 and the high track 5 is recorded as the track design spacing and / or the track design height difference.

[0055] Specifically, the height difference between the low track 6 and the high track 5 at the time when the perpendicular point from the second center of mass point to the track line segment 8 is located between one fourth and three fourths of the track line segment 8 is recorded as the track design height difference by adjusting the height of the low track 6 or the high track 5, or the spacing between the low track 6 and the high track 5 is recorded as the track design spacing. The track design spacing and the track design height difference are obtained by the first center of mass point 7 and the second center of mass point, and the high and low tracks are set according to the obtained track design spacing and track design height difference, so that the force on the column 2 is more balanced and the stability of the machine tool is ensured.

[0056] Further, referring to Figure 1 and Figure 2 , the height difference between the low track 6 and the high track 5 when the second center of mass point coincides with the first center of mass point 7 is recorded as the track design height difference by adjusting the height of the low track 6 or the high track 5 until the second center of mass point coincides with the first center of mass point 7.

[0057] Specifically, in actual design, when the spacing between the high track 5 and the low track 6 is determined, the height difference between the high track 5 and the low track 6 is obtained based on the spacing, and in this process, the connecting line between the second center of mass point and the track line segment 8 is the second center line, which can be adjusted to be perpendicular to the virtual track line 8 by adjusting the height of the high and low tracks. When the second center line is perpendicular to the track line segment 8, the second center of mass point does not necessarily coincide with the first center of mass point 7, and the height difference between the high and low tracks 6 can be changed, for example, the height of the high track 5 is adjusted so that the second center of mass point moves to the position of the first center of mass point 7 until they coincide, and preferably the height difference between the high and low tracks when the second center of mass point coincides with the first center of mass point 7 is the track design height difference. At this time, the spacing and the height difference between the high and low tracks are obtained, and the subsequent high track 5 and low track 6 can be produced according to the track design spacing and the track design height difference in actual use.

[0058] The above merely is the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A horizontal machining center comprising a base (1), a column (2), a spindle box (3) and a saddle (4), wherein the base (1) is provided with a high rail (5) and a low rail (6) parallel to each other, the column (2) is movably arranged on the high rail (5) and the low rail (6) along the X-axis direction, the saddle (4) is movably arranged on the column (2) along the Z-axis direction, and the spindle box (3) is movably arranged on the saddle (4) along the Y-axis direction, characterized in that, The stroke of the slide saddle (4) moving on the column is set as equal upper half interval (17) and lower half interval, during the process of the spindle box (3) moving forward and backward along the Y axis direction relative to the slide saddle (4) and the slide saddle (4) moving up and down on the upper half interval (17) along the Z axis direction relative to the column (2), all the center of mass points of the combination of the spindle box (3) and the slide saddle (4) form a center of mass point range (16), the line segment (8) between the high track (5) and the low track (6) is the track line segment (8) of the vertical line of the vertical plane perpendicular to the high track (5) or the low track (6) passing through the center of mass point range (16).

2. - The horizontal machining center according to claim 1, characterized in that, In the position state of the slide saddle (4) being located at one side of the quarter of the stroke of the slide saddle (4) and being away from the base, the spindle box (1) is moved forward and backward along the Y axis direction respectively to the maximum displacement, and the first center of mass point (12) and the second center of mass point (13) of the combination are correspondingly obtained, the midpoint of the first center of mass point (12) and the second center of mass point (13) is taken as the first center of mass point (7), wherein the vertical point of the first center of mass point (7) to the vertical line of the track line segment (8) is located between the quarter and the three quarter of the track line segment (8).

3. - The horizontal machining center according to claim 2, characterized in that, The vertical line of the track line segment (8) bisects the center of mass range; or / and, In the state that the slide saddle (4) is moved up to the maximum displacement along the Z axis direction relative to the column (2) and the spindle box (3) is moved backward to the maximum displacement along the Y axis direction relative to the slide saddle (4), the vertical point of the center of mass point of the combination to the track line segment (8) is located on the endpoint of the track line segment (8) close to the high track (5).

4. - The horizontal machining center according to claim 2, characterized in that, In the state that the center of mass point of the combination is located at the first center of mass point (7), the slide saddle (4) is moved up to the maximum displacement and to the position of the half of the stroke of the slide saddle (4) respectively, and the third center of mass point (14) and the fourth center of mass point (15) are correspondingly obtained, and the vertical point of the third center of mass point (14) and the fourth center of mass point (15) to the vertical line of the track line segment (8) is located between the quarter and the three quarter of the track line segment (8).

5. - The horizontal machining center according to any one of claims 1 to 4, characterized in that, The center of mass range is located between the vertical plane where the high track (5) is located and the vertical plane where the low track (6) is located, and the vertical line of the track line segment (8) and the boundary of the center of mass range have at least two intersection points.

6. A horizontal machining center according to any one of claims 1 to 4, characterized in that, The slide saddle (4) is provided with a sliding block (10), the sliding block (10) is provided with a first track, the spindle box (3) is provided with a second track (11), and the spindle box (3) slides on the first track through the second track (11). The first track is a concave track arranged on the slider (10), the second track (11) is a linear track arranged on the spindle box (3), the linear track is fitted in the concave track; the linear track is symmetrically arranged with the middle line of the spindle box (3) in the width direction.

7. A modeling method of high-low rails of a horizontal machining center, the horizontal machining center comprising a base (1), a column (2), a spindle box (3) and a saddle (4), the high-low rails comprising a high rail (5) and a low rail (6) arranged on the base (1) and parallel to each other, the column (2) being movably arranged on the high rail (5) and the low rail (6) along an X-axis direction, the saddle (4) being movably arranged on the column (2) along a Z-axis direction, the spindle box (3) being movably arranged on the saddle (4) along a Y-axis direction, characterized in that, The modeling method comprises the following steps: When the slide saddle (4) is respectively moved up to the maximum displacement and down to the middle position relative to the column (2), the spindle box (3) is moved forward and backward relative to the slide saddle (4) along the Y-axis direction, in the process of moving the spindle box (3), a first combined centroid point group of the combination of the spindle box (3) and the slide saddle (4) is generated, and the distance between the high track (5) and the low track (6) in the horizontal direction is adjusted, so that the first combined centroid point is located between the vertical plane where the high track (5) is located and the vertical plane where the low track (6) is located. When the spindle box (3) is respectively moved forward and backward to the maximum displacement relative to the slide saddle (4), the slide saddle (4) is moved up and down relative to the column (2) along the Z-axis direction between the middle position and the maximum displacement above, in the process of moving the slide saddle (4), a second combined centroid point group of the combination of the spindle box (3) and the slide saddle (4) is generated, the first combined centroid point group and the second combined centroid point group form a centroid point range; the height difference between the high track (5) and the low track (6) is adjusted, so that the vertical line of any centroid point in the centroid point range is perpendicular to the vertical plane of the high track (5) or the low track (6), the connecting line between the high track (5) and the low track (6) is a track line segment (8), the middle perpendicular line of the track line segment (8) passes through the centroid point range, and at least one set of the distance and / or the height difference between the low track (6) and the high track (5) is recorded as a track design distance and / or a track design height difference.

8. The method of claim 7, wherein, The slide saddle (4) is moved to a position of one quarter of the stroke of the slide saddle (4), and the slide saddle (4) is located away from the base (1). The spindle box (1) is respectively moved forward and backward along the Y-axis direction to the maximum displacement, corresponding first and second centroid points (12) and (13) of the combination are obtained, the midpoint of the first and second centroid points (12) and (13) is taken as a first central centroid point (7), the vertical line between the first central centroid point (7) and the track line segment (8) is a first central line (9), the vertical point of the first central line (9) is located between one quarter and three quarters of the track line segment (8) by adjusting the distance and / or the height difference between the high track (5) and the low track (6), and at least one set of the distance and / or the height difference between the low track (6) and the high track (5) is recorded as a track design distance and / or a track design height difference.

9. The method of modeling a high-low rail of a horizontal machining center according to claim 8, characterized in that, The vertical point of the first central line (9) is located at the midpoint of the track line segment (8), and the distance between the low track (6) and the high track (5) at this time is recorded as a track design distance.

10. The method of modeling a high-low rail of a horizontal machining center according to claim 8, wherein, In the middle state of the main shaft box (3) stroke; The third center of mass point is obtained by moving the slide saddle (4) upward along the Z-axis direction to the maximum displacement of the combination, the fourth center of mass point is obtained by moving the slide saddle (4) downward to the middle position of the slide saddle stroke, the midpoint of the third center of mass point and the fourth center of mass point is taken as the second center of mass point, the track design spacing and / or height difference of the low track (6) or the high track (5) is adjusted, so that the vertical point of the second center of mass point to the track line segment (8) is located between one fourth and three fourths of the track line segment (8), and at least one set of spacing and / or height difference between the low track (6) and the high track (5) is recorded as the track design spacing and / or the track design height difference.

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