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 rail or the low rail, and meanwhile the vertical point from all the mass center points to the connecting line between the high rail and the low rail is located on the line segment between the high rail and the low rail. The vertical point from the mass center point of the combination body to the connecting line between the high rail and the low rail is located on the rail line segment between the high rail and the low rail, the stress of the stand column is more balanced through the high-low rail design mode, 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 precision 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, so that the centroid point of the combination of the spindle box and the saddle is perpendicular to the 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 which are 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 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, the centroid point of the combination of the spindle box and the saddle forms a centroid point range. At any centroid point in the centroid point range, the vertical point of the centroid point to the line between the high rail and the low rail is located on the rail segment between the high rail and the low rail.

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

[0007] In an embodiment, the vertical point of the vertical line of the first center centroid point to the rail segment is located at the midpoint of the rail segment; or / and,

[0008] In the state that the saddle is moved upward along the Z-axis direction to the maximum displacement relative to the column, and the spindle box is moved backward along the Y-axis direction to the maximum displacement 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] The spindle box is moved forward and backward along the Y-axis direction relative to the saddle, and in the process of moving the spindle box, a plurality of first combined centers of mass of a combination formed by the spindle box and the saddle are generated, and the distance between the high track and the low track in the horizontal direction is adjusted so that the first combined centers of mass are 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, and during the movement of the saddle, a plurality of second combined mass points of the combination of the spindle head and the saddle are generated, the plurality of first combined mass points and the plurality of second combined mass points form a mass point range; the height difference between the high rail and the low rail is adjusted, so that the vertical plane of any mass point in the mass point range is perpendicular to the high rail or the low rail, the vertical point of the corresponding mass point to the connecting line between the high rail and the low rail is located on the rail segment between the high rail and the low rail, and at least one set of the distance and / or the height difference between the low rail and the high rail is recorded as the rail design distance and / or the rail design height difference.

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

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

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

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

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

[0021] The beneficial effects of this invention are as follows: the spindle box moves back and forth relative to the slide saddle, and the slide saddle moves up and down relative to the column. During the entire movement of the assembly formed by the spindle box and slide saddle, any centroid within its range is perpendicular to the plane of the high or low track. Simultaneously, the perpendicular points from all centroids to the line connecting the high and low tracks lie on the line segment between the high and low tracks. This high-low track design ensures more balanced force distribution on the column, guaranteeing the stability of the machine tool processing. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the bedroom processing center of the present invention;

[0024] Figure 2 This is another structural schematic diagram of the bedroom processing center of the present invention;

[0025] Figure 3 This is a schematic diagram of the result of the sliding saddle of the present invention;

[0026] Figure 4 This is a force analysis diagram of the high and low rails of this invention;

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

[0028] The attached diagram is labeled as follows: 1-base, 2-column, 3-spindle box, 4-slide saddle, 5-high track, 51-vertical surface of high track, 6-low track, 61-vertical surface of low track, 7-first center point, 8-track segment, 9-first center line, 10-slider, 11-second track, 12-first center point, 13-second center point, 14-third center point, 15-fourth center point, 16-range of center point. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] refer toFigure 1 , Figure 2 and Figure 4 A horizontal machining center according to an embodiment of the present invention includes a base 1, a column 2, a spindle box 3, and a slide saddle 4. The base 1 is provided with a high track 5 and a low track 6 that are parallel to each other. The column 2 is movably mounted on the high track 5 and the low track 6 along the X-axis. The slide saddle 4 is movably mounted on the column 2 along the Z-axis. The spindle box 3 is movably mounted on the slide saddle 4 along the Y-axis. During the forward and backward movement of the spindle box 3 relative to the slide saddle 4 along the Y-axis and the up and down movement of the slide saddle 4 relative to the column 2 along the Z-axis, the centroid of the combination of the spindle box 3 and the slide saddle 4 forms a centroid range 16. Further, the centroid range 16 is located between the vertical plane (vertical plane 51 of the high track 5) and the vertical plane (vertical plane 61 of the low track 6) where the high track 5 is located. The perpendicular bisector of the track segment 8 intersects the boundary of the centroid range at least twice. On any plane perpendicular to the high track 5 or the low track 6 through the centroid range 16, the perpendicular point from the centroid to the line connecting the high track 5 and the low track 6 is located on the track segment 8 between the high track 5 and the low track 6. The track segment 8 is a virtual line connecting the high track 5 and the low track 6. The perpendicular bisector of the track segment 8 passes through the centroid range 16.

[0031] In this invention, the spindle box 3 moves back and forth along the Y-axis on the slide saddle 4, and then the slide saddle 4 moves up and down. During the entire movement of the assembly formed by the spindle box and slide saddle, the range 16 of the center of mass is located between the vertical plane containing the high track 5 (high track vertical plane 51) and the vertical plane containing the low track 6 (low track vertical plane 61). Each center of mass is perpendicular to the plane of either the high track 5 or the low track 6. Simultaneously, the perpendicular points from all center of mass to the line connecting the high track 5 and the low track 6 (track segment 8) are located on the line segment between the high track 6 and the low track 6. The line connecting the center of mass of the assembly to the high and low tracks (including the high track 5 and the low track 6) is perpendicular to the track segment 8. This high and low track design makes the column more evenly stressed, ensuring the stability of the machine tool processing. For example, refer to... Figure 5 According to the force analysis of column 2, the resultant force of the high and low tracks points to the first center of mass point 7. At this time, the high and low tracks can provide stable support for column 2.

[0032] In one embodiment, the perpendicular point of the line from the first central centroid 7 to the track segment 8 is located at the midpoint of the track segment 8.

[0033] In one embodiment, reference Figure 1 and Figure 2When the sliding saddle 4 moves upward relative to the column 2 along the Z-axis to the maximum displacement, and the main spindle box 3 moves backward relative to the sliding saddle 4 along the Y-axis to the maximum displacement, the perpendicular point from the center of mass of the assembly to the track segment 7 is located at the end point of the track segment 7 on the side of the track 7 that is higher than the track 5.

[0034] In one embodiment, reference Figure 1 The perpendicular bisector of track segment 8 bisects the range of the centroid.

[0035] In one embodiment, reference Figure 1 and Figure 2 During the forward and backward movement of the spindle box 3 relative to the slide saddle 4 along the Y-axis and the up and down movement of the slide saddle 4 relative to the column 2 along the Z-axis, the centroid of the assembly of the spindle box 3 and the slide saddle 4 forms a centroid range 16, which specifically includes:

[0036] With the saddle 4 positioned at one-quarter of its travel and away from the base, the spindle box 1 is moved forward and backward along the Y-axis to its maximum displacement, resulting in the first centroid 12 and the second centroid 13 of the assembly. The midpoint between the first centroid 12 and the second centroid 13 is taken as the first central centroid 7. A virtual first center line 9 is formed between the first central centroid 7 and the track segment 8. The first center line 9 is perpendicular to the track segment 8, so that the perpendicular point from the first central centroid 7 to the track segment 8 is located between one-quarter and three-quarters of the length of the track segment 8.

[0037] Specifically, in practical work, the lower part of column 2 is usually relatively stable. Therefore, when calculating the high and low rails using the center of gravity, it is generally not necessary to move the saddle 4 downwards to its maximum displacement. However, to facilitate the design of the high and low rails, the saddle is moved to one-quarter of its stroke, that is, the saddle's stroke is divided into two equal segments, with the saddle positioned in the middle of the upper segment. Then, the spindle box is moved forward and backward to its maximum displacement, corresponding to the first and second center of gravity points, and thus the first central center of gravity point is determined. To ensure that the high and low rails provide better support for the column, this invention draws a center line (first center line 9) from the first central center of gravity point to the line connecting the high and low rails (track segment 8), making the first center line 9 perpendicular to the line connecting the high and low rails. The perpendicular point of the first central center of gravity 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 of the track segment 8. (Refer to...) Figure 2 This allows the high and low rails to provide more stable support for column 2.

[0038] In one embodiment, reference Figure 1 and Figure 2During the forward and backward movement of the spindle box 3 relative to the slide saddle 4 along the Y-axis and the up and down movement of the slide saddle 4 relative to the column 2 along the Z-axis, the centroid range 16 of the assembly formed by the spindle box 3 and the slide saddle 4 specifically includes:

[0039] With the center of mass of the assembly located at the first central center of mass 7, the saddle 4 is moved upwards to its maximum displacement and then to half its travel distance, respectively, resulting in the third center of mass 14 and the fourth center of mass 15. The perpendiculars from the third center of mass 14 and the fourth center of mass 15 to the perpendiculars to the track segment 8 are both located between one-quarter and three-quarters of the length of the track segment 8. Further, the midpoint between the third center of mass 14 and the fourth center of mass 15 is taken as the second central center of mass. A virtual second center line is formed between the second central center of mass and the track segment, and this second center line is perpendicular to the track segment 8.

[0040] To ensure optimal support for column 2 from the high and low rails, this invention draws a centerline from the second central centroid to the line connecting the high and low rails, i.e., the second centerline, which is perpendicular to the track segment 8 between the high and low rails. To further provide stable support for column 2, the second central centroid coincides with the first central centroid 7, as shown in the reference diagram. Figure 5 This causes the resultant force of the high-altitude orbit to point towards the center of mass of the first center.

[0041] In one embodiment, reference Figure 1 and Figure 3 A slider 10 is mounted on the slide saddle 4, and a first track is mounted on the slider 10. A second track 11 is mounted on the spindle box 3, and the spindle box 3 slides on the first track via the second track 11. In the prior art, the slider 10 is usually mounted on the spindle box 3, which can affect the balance of the spindle box 3. In this embodiment, the slider 10 is mounted on the slide saddle 4. Since the slide saddle 4 moves up and down, the weight of the slider 10 will not have a significant impact on it, which is beneficial to the balance of the spindle box 3 or the entire column 2.

[0042] Further, refer to Figure 1 and Figure 3 The first track is a concave track on the slider 10, and the second track 11 is a linear track on the spindle box 3, with the linear track fitting into the concave track. The linear tracks are symmetrically arranged about the centerline of the spindle box 3 in the width direction, and are distributed on both sides of the centerline of the spindle box 3, avoiding the weight imbalance of the spindle box 3 caused by placing the linear tracks on one side or biased towards one side of the spindle box 3.

[0043] In another embodiment, reference Figure 1 , Figure 2 and Figure 5This invention provides a modeling method for the high and low tracks of a horizontal machining center. The horizontal machining center includes a base 1, a column 2, a spindle box 3, and a slide saddle 4. The high and low tracks include a high track 5 and a low track 6, which are parallel to each other and are mounted on the base 1. The column 2 is movably mounted on the high track 5 and the low track 6 along the X-axis. The slide saddle 4 is movably mounted on the column 2 along the Z-axis. The spindle box 3 is movably mounted on the slide saddle 4 along the Y-axis. The modeling method includes the following steps:

[0044] S100: Move the spindle box 3 back and forth relative to the slide saddle 4 along the Y-axis. During the movement of the spindle box 3, generate several first combined centroids of the combination formed by the spindle box 3 and the slide saddle 4. Adjust the horizontal distance between the high track 5 and the low track 6 so that the first combined centroids are all located between the vertical plane where the high track 5 is located and the vertical plane where the low track 6 is located.

[0045] S200: When the spindle box 3 moves forward and backward relative to the slide saddle 4 to its maximum displacement, the slide saddle 4 is moved up and down relative to the column 2 along the Z-axis. During the movement of the slide saddle 4, several second combined centroids of the assembly formed by the spindle box 3 and the slide saddle 4 are generated. Several first combined centroids and several second combined centroids form a centroid range 16. The height difference between the high track 5 and the low track 6 is adjusted so that any centroid passing through the centroid range 16 is perpendicular to the vertical plane of the high track 5 or the low track 6. The perpendicular point from the centroid to the line connecting the high track 5 and the low track 6 is located on the track segment 8 between the high track 5 and the low track 6. At least one set of the spacing and / or height difference between the low track 6 and the high track 5 is recorded as the track design spacing and / or track design height difference.

[0046] In this invention, the spindle box 3 moves back and forth along the Y-axis on the slide saddle 4, and then the slide saddle 4 moves up and down. During the entire movement of the assembly formed by the spindle box 3 and the slide saddle 4, the range 16 of the center of mass is located between the vertical plane containing the high track 5 and the vertical plane containing the low track 6, and each center of mass is perpendicular to the plane of either the high track 5 or the low track 6. Simultaneously, the perpendicular points from all center of mass to the line connecting the high track 5 and the low track 6 (track segment 8) are located on the line segment between the high track 5 and the low track 6. The line connecting the center of mass of the assembly to the high and low tracks (including the high track 5 and the low track 6) is perpendicular to the track segment 8. This high and low track design makes the column 2 more evenly stressed, ensuring the stability of the machine tool processing. For example, refer to... Figure 5 According to the force analysis of column 2, the resultant force of the high and low tracks points to the first center of mass point 7. At this time, the high and low tracks can provide stable support for column 2.

[0047] In one embodiment, reference Figure 1 and Figure 2Step S100 specifically includes:

[0048] S101: Move the slide saddle 4 to a position one-quarter of the travel of the slide saddle 4, with the slide saddle 4 located on the side away from the base 1;

[0049] S102: Move the spindle box 1 forward and backward along the Y-axis to the maximum displacement respectively, and obtain the first centroid 12 and the second centroid 13 of the assembly. Take the midpoint of the first centroid 12 and the second centroid 13 as the first central centroid 7. The perpendicular line between the first central centroid 7 and the track segment 8 is the first center line 9. By adjusting the spacing 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 segment 8. Record at least one set of spacing and / or height difference between the low track 6 and the high track 5 as the track design spacing and / or track design height difference.

[0050] Specifically, in actual work, the lower part of the column 2 is usually relatively stable. Therefore, the travel of the slide saddle 4 is divided into two equal upper and lower parts. When calculating the high and low rails through the center of gravity, it is generally not necessary to move the slide saddle 4 down to the maximum displacement of its travel. Instead, the slide saddle 4 is moved to the middle position of its travel, that is, to the fourth center of gravity 15.

[0051] In this invention, the sliding saddle 4 is moved to the middle position of the upper half of the stroke of the column 2. Then, the spindle box 3 is moved forward and backward along the sliding saddle 4 to its maximum displacement. The first center centroid 7 is determined based on the maximum forward and backward displacement. The spacing between the high and low tracks is continuously changed until the first center line 9 is perpendicular to the track segment 8. The spacing between the high track 5 and the low track 6 at this point is considered the designed track spacing. Furthermore, during the adjustment of the high and low tracks, the position of the high track 5 can be adjusted while keeping the position of the low track 6 unchanged, or the position of the low track 6 can be adjusted while keeping the position of the high track 5 unchanged.

[0052] Further, refer to Figure 1 and Figure 2 The first center line 9 is perpendicular to the track segment 8, and the perpendicular point is located at the midpoint of the track segment 8. 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 can provide more stable support for the column 2.

[0053] In one embodiment, reference Figure 1 and Figure 2 Step S200 includes:

[0054] In the middle state of the spindle box's 3rd stroke;

[0055] When the sliding saddle 4 is moved upward along the Z-axis to its maximum displacement, the third centroid of the assembly is obtained. When the sliding saddle 4 is moved downward to the middle position of the sliding saddle stroke, the fourth centroid of the assembly is obtained. The midpoint between the third and fourth centroids is taken as the second central centroid. By adjusting the design spacing and / or height difference of the low track 6 or the high track 5, the perpendicular point from the second central centroid to the track segment 8 is located between one-quarter and three-quarters of the track segment 8. 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 track design height difference.

[0056] Specifically, by adjusting the height of the lower track 6 or the higher track 5, the perpendicular point from the second center centroid to track segment 8 is positioned between one-quarter and three-quarters of the length of track segment 8. The height difference between the lower track 6 and the higher track 5 at this point is recorded as the track design height difference, or the distance between the lower track 6 and the higher track 5 is recorded as the track design spacing. This invention calculates the spacing and height difference between the high and low tracks using the first center centroid 7 and the second center centroid. The high and low tracks are then set according to the calculated track design spacing and track design height difference to ensure a more balanced force on the column 2 and guarantee the stability of the machine tool processing.

[0057] Further, refer to Figure 1 and Figure 2 By adjusting the height of the low track 6 or the high track 5 until the second center centroid coincides with the first center centroid 7, the height difference between the low track 6 and the high track 5 when the second center centroid coincides with the first center centroid 7 is recorded as the track design height difference.

[0058] Specifically, in the actual design, once the distance 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 calculated based on this distance. During this process, the line connecting the second center centroid and track segment 8 is the second centerline. The height of the high and low tracks can be adjusted to make the second centerline perpendicular to the virtual track line 8. When the second centerline is perpendicular to track segment 8, the second center centroid may not coincide with the first center centroid 7. This can be achieved by changing the height difference between the high and low tracks 6, for example, by adjusting the height of the high track 5, so that the second center centroid moves towards the position of the first center centroid 7 until they coincide. The height difference between the high and low tracks when the second center centroid coincides with the first center centroid 7 is preferably taken as the designed track height difference. Thus, the distance and height difference between the high and low tracks are calculated. In subsequent actual use, the high track 5 and the low track 6 can be produced according to this designed track distance and designed track height difference.

[0059] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A horizontal machining center, comprising a base (1), a column (2), a spindle box (3), and a slide saddle (4), wherein the base (1) is provided with a high track (5) and a low track (6) that are parallel to each other; the column (2) is movably disposed on the high track (5) and the low track (6) along the X-axis; the slide saddle (4) is movably disposed on the column (2) along the Z-axis; and the spindle box (3) is movably disposed on the slide saddle (4) along the Y-axis, characterized in that, During the process of the spindle box (3) moving back and forth relative to the slide saddle (4) along the Y-axis and the slide saddle (4) moving up and down relative to the column (2) along the Z-axis, the centroid of the combination of the spindle box (3) and the slide saddle (4) forms a centroid range (16). Any centroid within the centroid range (16) is perpendicular to the vertical plane of the high track (5) or the low track (6). The perpendicular point from the centroid to the line connecting the high track (5) and the low track (6) is located on the track segment (8) between the high track (5) and the low track (6).

2. The horizontal machining center according to claim 1, characterized in that, When the saddle (4) is in a position one-quarter of the stroke of the saddle (4) and away from the base, the spindle box (1) is moved forward and backward along the Y-axis to the maximum displacement, respectively, and the first centroid (12) and the second centroid (13) of the assembly are obtained accordingly. The midpoint of the first centroid (12) and the second centroid (13) is taken as the first central centroid (7), wherein the perpendicular point of the first central centroid (7) to the perpendicular line of the track segment (8) is located between one-quarter and three-quarters of the track segment (8).

3. The horizontal machining center according to claim 2, characterized in that, The perpendicular point of the perpendicular line from the first central centroid (7) to the track segment (8) is located at the midpoint of the track segment (8); or / and, When the slide saddle (4) moves upward relative to the column (2) along the Z-axis to the maximum displacement, and the spindle box (3) moves backward relative to the slide saddle (4) along the Y-axis to the maximum displacement, the centroid of the assembly and the perpendicular point of the track segment (8) are located on the end point of the track segment (8) near the high track (5).

4. The horizontal machining center according to claim 2, characterized in that, With the center of mass of the assembly located at the first center of mass (7), the saddle (4) is moved upward to the maximum displacement and to half the stroke of the saddle (4) respectively, thus obtaining 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 segment (8) are both located between one-quarter and three-quarters of the track segment (8).

5. The horizontal machining center according to any one of claims 1 to 4, characterized in that, The centroid range (16) 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 perpendicular bisector of the track segment (8) intersects the boundary of the centroid range at least twice.

6. The horizontal machining center according to any one of claims 1 to 4, characterized in that, The slide saddle (4) is provided with a slider (10), the slider (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 via the second track (11); The first track is a concave track on the slider (10), and the second track (11) is a linear track on the spindle box (3), the linear track fitting into the concave track; the linear track is arranged symmetrically about the centerline of the width direction of the spindle box (3).

7. A method for modeling the high and low tracks 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 and low tracks comprising a high track (5) and a low track (6) arranged on the base (1) and parallel to each other, the column (2) being movably arranged on the high track (5) and the low track (6) along the X-axis, the slide saddle (4) being movably arranged on the column (2) along the Z-axis, and the spindle box (3) being movably arranged on the slide saddle (4) along the Y-axis, characterized in that, The modeling method includes the following steps: The spindle box (3) is moved back and forth along the Y-axis relative to the slide saddle (4). During the movement of the spindle box (3), a number of first combined centroids of the assembly formed by the spindle box (3) and the slide saddle (4) are generated. The horizontal distance between the high track (5) and the low track (6) is adjusted so that the first combined centroids are all 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) moves forward and backward relative to the slide saddle (4) to its maximum displacement, the slide saddle (4) moves up and down relative to the column (2) along the Z-axis. During the movement of the slide saddle (4), several second combined centroids of the assembly formed by the spindle box (3) and the slide saddle (4) are generated. Several first combined centroids and several second combined centroids form a centroid range (16). The height difference between the high track (5) and the low track (6) is adjusted so that any centroid within the centroid range (16) is perpendicular to the vertical plane of the high track (5) or the low track (6). The perpendicular point from the centroid to the line connecting the high track (5) and the low track (6) is located on the track segment (8) between the high track (5) and the low track (6). At least one set of the spacing and / or height difference between the low track (6) and the high track (5) is recorded as the track design spacing and / or track design height difference.

8. The modeling method for high and low orbits according to claim 7, characterized in that, Move the slide saddle (4) to a position one-quarter of the travel of the slide saddle (4), and position the slide saddle (4) away from the base (1); The spindle box (1) is moved forward and backward along the Y-axis to the maximum displacement, respectively, to obtain the first centroid (12) and the second centroid (13) of the assembly. The midpoint of the first centroid (12) and the second centroid (13) is taken as the first central centroid (7). The perpendicular line between the first central centroid (7) and the track segment (8) is taken as the first center line (9). By adjusting the spacing 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 segment (8). 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 track design height difference.

9. The modeling method for the high and low tracks of a horizontal machining center according to claim 8, characterized in that, Make the perpendicular point of the first center line (9) located at the midpoint of the track segment (8), and record the distance between the low track (6) and the high track (5) at this time as the track design distance.

10. The modeling method for the high and low tracks of a horizontal machining center according to claim 8, characterized in that, In the middle state of the stroke of the spindle box (3); When the saddle (4) is moved upward along the Z-axis to the maximum displacement, the third centroid of the assembly is obtained. When the saddle (4) is moved downward to the middle position of the saddle stroke, the fourth centroid of the assembly is obtained. The midpoint between the third centroid and the fourth centroid is taken as the second central centroid. By adjusting the track design spacing and / or height difference of the low track (6) or the high track (5), the perpendicular point from the second central centroid to the track segment (8) is located between one-quarter and three-quarters of the track segment (8). 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 track design height difference.

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