A movable column type boring and milling machining center

Abstract

The application discloses a movable column type head-to-head boring and milling machining center, which comprises a bed body, a workbench fixed to the middle part of the bed body and two sets of machining units symmetrically arranged on the two sides of the workbench. Each set of machining unit comprises a column, and the bed body is provided with two sets of slide moving structures which are symmetrically arranged on the two sides of the workbench. The column of each set of machining unit is installed on one set of slide moving structure, and each set of slide moving structure is used for driving the column to move along the directions of Z axis and X axis which are perpendicular to each other. The machining center drives the column to move along the directions of Z axis and X axis by the slide moving structure when the workpiece is fixed on the workbench, so that the workpiece clamped on the fixed workbench remains unmoved, the structure is stable, the inertia and vibration problems caused by the movement of heavy workpieces are completely eliminated, high stability, high precision, excellent dynamic response, strong bearing capacity and compact and reasonable structure layout are realized, and the machining center is particularly suitable for high-precision machining of large and heavy workpieces.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, specifically to a moving column type head boring and milling machining center. Background Technology

[0002] Existing head-to-head boring and milling machining centers mostly employ a symmetrical twin-spindle structure to achieve simultaneous machining of both ends of the workpiece, thereby improving machining efficiency. This type of machine tool typically mounts the worktable on a slide, and the workpiece is positioned in the horizontal plane (i.e., the XZ plane) by moving the worktable. For heavy and large workpieces, moving the worktable results in a large overall mass of the moving parts, generating significant inertia. This not only requires a high-power drive system but also easily causes machine tool vibration during start-up and shutdown, affecting machining accuracy and surface quality. Furthermore, the large moving mass also limits the machine tool's dynamic response speed and acceleration, impacting machining efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a moving column type head-mounted boring and milling machining center to solve the problem of inertial impact and vibration caused by workpiece movement during the machining of heavy workpieces, so as to achieve high stability and high precision machining.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a moving column type head-to-head boring and milling machining center, including a bed, a worktable fixed in the middle of the bed, and two sets of machining units symmetrically arranged on both sides of the worktable. Each set of machining units includes a column. Two sets of sliding seat moving structures are provided on the bed. The two sets of sliding seat moving structures are symmetrically arranged on both sides of the worktable. The column of each set of machining units is mounted on one set of sliding seat moving structures. Each set of sliding seat moving structures is used to drive the column to move along mutually perpendicular Z-axis and X-axis directions.

[0005] The present invention relates to a moving column type head-to-head boring and milling machining center. By symmetrically arranging two sets of sliding seat moving structures on both sides of a fixed worktable and mounting the column on the sliding seat moving structures, the column is driven by the sliding seat moving structures to move along the Z-axis and X-axis directions, so that the workpiece is clamped on the fixed worktable and remains stationary. This completely eliminates the inertial impact and vibration caused by the movement of heavy workpieces, and improves machining stability and accuracy. At the same time, the two symmetrically arranged machining units can perform synchronous boring and milling on both ends of the workpiece.

[0006] Preferably, each slide moving structure includes a slide, a Z-axis drive assembly, and an X-axis drive assembly. The slide is movably mounted on the machine bed along the Z-axis and is driven by the Z-axis drive assembly. The column is movably mounted on the slide along the X-axis and is driven by the X-axis drive assembly. The Z-axis and X-axis drive assemblies enable independent movement of the column in two directions within the horizontal plane. Since the moving parts are only the slide, the column, and the related drive assemblies, the mass relative to the workpiece is significantly reduced, thereby improving the machine tool's dynamic response speed and feed efficiency.

[0007] Preferably, the Z-axis drive assembly includes a Z-axis slide rail, a Z-axis slider, and a Z-axis lead screw module. The Z-axis slide rail is laid on the bed, the Z-axis slider is mounted on the lower side of the slide block, and the Z-axis lead screw module is used to drive the slide block to move along the Z-axis slide rail. The X-axis drive assembly includes an X-axis slide rail, an X-axis slider, and an X-axis lead screw module. The X-axis slide rail is laid on the upper surface of the slide block, the X-axis slider is mounted on the lower side of the column, and the X-axis lead screw module is used to drive the column to move along the X-axis slide rail. The above-mentioned Z-axis drive assembly and X-axis drive assembly realize the movement of the slide block and the column through lead screw transmission and sliding guide rail guidance, respectively. The transmission is smooth and the positioning is accurate. At the same time, the structure is compact and the force flow path is closed, ensuring the overall rigidity of the machine tool.

[0008] As a further preferred embodiment, the number of Z-axis slide rails is three, which are laid parallel to each other on the bed, and the Z-axis lead screw module is located between the three Z-axis slide rails. These three Z-axis slide rails ensure balanced force distribution when the slide moves in the Z-axis direction, guaranteeing the straightness of the movement and improving the stability and positioning accuracy of the slide movement.

[0009] As a further preferred embodiment, the number of X-axis slide rails is two, and the two X-axis slide rails are laid parallel to each other on the upper surface of the slide block, with the X-axis lead screw module located between the two X-axis slide rails. The above-mentioned two X-axis slide rails can enhance the rigidity and anti-overturning capacity of the column when it moves along the X-axis direction, and are especially suitable for bearing the lateral force during the processing of heavy workpieces, ensuring the smoothness of the column movement.

[0010] Preferably, each machining unit further includes a spindle box, a Y-axis lead screw module, and a Y-axis hardened rail. The Y-axis lead screw module and the Y-axis hardened rail are mounted on the front of the column. The spindle box is slidably connected to the Y-axis hardened rail. The spindle box is driven by the Y-axis lead screw module to achieve feed motion in the Y-axis direction. The spindle box can move up and down along the Y-axis, cooperating with the Z-axis and X-axis movements to form a three-axis linkage, meeting various machining needs such as boring, milling, and drilling, thus expanding the machining range of the machine tool.

[0011] As a further preferred embodiment, the number of Y-axis hard rails is two, and the two Y-axis hard rails are laid parallel to each other on the front of the column, with the Y-axis lead screw module located between the two Y-axis hard rails. The aforementioned two Y-axis hard rails ensure that the spindle box is subjected to uniform force on both sides when moving along the Y-axis, resulting in good linearity of movement, which is beneficial to improving the stability of the spindle box feed and machining accuracy.

[0012] Preferably, the bed is a one-piece cast box-shaped structure. The one-piece cast box-shaped structure of the bed has high static rigidity and vibration resistance, effectively suppressing vibrations generated during machine tool processing and providing stable foundation support for high-precision machining.

[0013] Preferably, the bottom of the machine bed is provided with multiple leveling feet for installation. These feet allow for easy adjustment of the machine bed's levelness and height, ensuring the machine tool remains in a stable, level position and thus guaranteeing installation and machining accuracy.

[0014] Compared with the prior art, the present invention has the following advantages: (1) High stability and precision: This invention arranges two sets of sliding moving structures symmetrically on both sides of the fixed worktable and installs the column on the sliding moving structure. The sliding moving structure drives the column to move along the Z-axis and X-axis, so that the workpiece is clamped on the fixed worktable and remains stationary. The structure is stable and completely eliminates the inertia and vibration problems caused by the movement of heavy workpieces. This creates extremely stable conditions for high-precision cutting. At the same time, the two symmetrically arranged machining units can perform synchronous boring and milling on both ends of the workpiece, further ensuring the consistency of machining accuracy. (2) Excellent dynamic performance: Since the workpiece is fixed, the moving parts are only the column, slide and spindle box, etc., which are significantly lighter than the workpiece. The dynamic response acceleration and maximum feed speed of the machine tool are improved, the auxiliary time is shortened and the processing efficiency is improved. (3) Strong load-bearing capacity: The fixed worktable structure can be designed to be more robust and have a stronger load-bearing capacity, making it particularly suitable for processing large and heavy workpieces without having to worry about the influence of workpiece mass on motion inertia. (4) Reasonable structure: The overall layout is compact and the force flow path is closed. The Z-axis drive assembly and X-axis drive assembly adopt screw transmission and sliding guide rail guidance respectively, so the transmission is smooth and the positioning is accurate, and the rigidity of the machine tool is effectively guaranteed. Attached Figure Description

[0015] Figure 1 This is an isometric view of the moving column type head-to-head boring and milling machining center in the embodiment; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a side view of the processing unit in the embodiment; Figure 4 This is an isometric view of the bed in the embodiment; The specific reference numerals in the figure are as follows: 1-Bed, 2-Column, 3-Slide, 4-X-axis lead screw module, 5-Z-axis slide rail, 6-Spindle box, 7-Z-axis slider, 8-Y-axis rigid rail, 9-Z-axis lead screw module, 10-X-axis slide rail, 11-Worktable, 12-X-axis slider, 13-Y-axis lead screw module, 14-Foot. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Components or structures not limited in this invention employ conventional techniques in the art.

[0017] The example of the moving column type head-to-head boring and milling machining center, such as Figures 1-4 As shown, the system includes a bed 1, a worktable 11, and two machining units symmetrically arranged on both sides of the worktable 11. The bed 1 is a one-piece cast box structure, with multiple leveling feet 14 at its bottom. The worktable 11 is directly bolted to the middle of the bed 1 for clamping workpieces. Each machining unit includes a column 2, a spindle head 6, a Y-axis lead screw module 13, and two Y-axis hard rails 8. The two Y-axis hard rails 8 are laid parallel to each other on the front of the column 2. The spindle head 6 is slidably connected to the two Y-axis hard rails 8. The Y-axis lead screw module 13 is mounted on the front of the column 2, located between the two Y-axis hard rails 8. The spindle head 6 is connected to the lead screw nut of the Y-axis lead screw module 13, which drives the feed motion in the Y-axis direction. The bed 1 is equipped with two sets of sliding movement structures, which are symmetrically arranged on both sides of the worktable 11. The column 2 of each machining unit is mounted on one set of sliding movement structures. Each set of sliding movement structures is used to drive the column 2 to move along the mutually perpendicular Z-axis and X-axis directions.

[0018] In this embodiment, each sliding block moving structure includes a sliding block 3, a Z-axis drive assembly, and an X-axis drive assembly. The sliding block 3 is movably mounted on the bed 1 along the Z-axis direction and is driven by the Z-axis drive assembly. The column 2 is movably mounted on the sliding block 3 along the X-axis direction and is driven by the X-axis drive assembly. The Z-axis drive assembly includes three Z-axis slide rails 5, a Z-axis slider 7, and a Z-axis lead screw module 9. The three Z-axis slide rails 5 are laid parallel on the bed 1. The Z-axis slider 7 is installed on the lower side of the sliding block 3. The Z-axis lead screw module 9 is positioned... Between the three Z-axis slide rails 5, the lead screw module 9 is connected to the slide block 3, which is used to drive the slide block 3 to move along the three Z-axis slide rails 5; the X-axis drive assembly includes two X-axis slide rails 10, an X-axis slider 12 and an X-axis lead screw module 4. The two X-axis slide rails 10 are laid parallel to each other on the upper surface of the slide block 3. The X-axis slider 12 is installed on the lower side of the column 2. The X-axis lead screw module 4 is located between the two X-axis slide rails 10. The lead screw module 4 is connected to the column 2, which is used to drive the column 2 to move along the two X-axis slide rails 10.

[0019] The key improvement of the aforementioned moving column type head boring and milling machining center lies in the fact that the slide 3 in the slide moving structure is set on the bed 1. This slide 3 directly drives the column 2 to move along the Z and X axes, instead of the traditional worktable movement. By integrating the moving function into the column 2, the workpiece remains fixed during machining, effectively reducing the inertial impact when large workpieces move, and improving machining stability and accuracy.

[0020] In actual operation, the aforementioned moving column type head-mounted boring and milling machining center securely clamps large workpieces (such as gantry beams) onto the worktable 11 fixed in the middle of the bed 1. The CNC system controls the coordinated movement of the slides 3 on both sides, driving the columns 2 and spindle box 6 at both ends to be positioned in the XZ plane to the machining starting point. Subsequently, the spindle box 6 drives the cutting tool to rotate and can move up and down along the Y-axis, allowing simultaneous boring, milling, and drilling of the two end faces of the workpiece. Because the workpiece is fixed throughout the process, the mass of the moving parts (columns 2, slides 3, and spindle box 6) is relatively light, resulting in smooth machine operation and high machining accuracy. This moving column type head-mounted boring and milling machining center is particularly suitable for simultaneous boring and milling of the two end faces of heavy, large box-shaped parts.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A moving column type head-to-head boring and milling machining center, comprising a bed, a worktable fixed in the middle of the bed, and two sets of machining units symmetrically arranged on both sides of the worktable, each set of machining units comprising a column, characterized in that, The machine bed is provided with two sets of sliding moving structures, which are symmetrically arranged on both sides of the worktable. The column of each processing unit is mounted on one of the sliding moving structures, and each set of sliding moving structures is used to drive the column to move along mutually perpendicular Z-axis and X-axis directions.

2. The moving column type head-to-head boring and milling machining center according to claim 1, characterized in that, Each set of the sliding body moving structure includes a sliding body, a Z-axis drive assembly and an X-axis drive assembly. The sliding body is movably mounted on the bed along the Z-axis direction and is driven by the Z-axis drive assembly. The column is movably mounted on the sliding body along the X-axis direction and is driven by the X-axis drive assembly.

3. The moving column type head-mounted boring and milling machining center according to claim 2, characterized in that, The Z-axis drive assembly includes a Z-axis slide rail, a Z-axis slider, and a Z-axis lead screw module. The Z-axis slide rail is laid on the bed, the Z-axis slider is installed on the lower side of the slide block, and the Z-axis lead screw module is used to drive the slide block to move along the Z-axis slide rail. The X-axis drive assembly includes an X-axis slide rail, an X-axis slider, and an X-axis lead screw module. The X-axis slide rail is laid on the upper surface of the slide block, the X-axis slider is installed on the lower side of the column, and the X-axis lead screw module is used to drive the column to move along the X-axis slide rail.

4. The moving column type head-to-head boring and milling machining center according to claim 3, characterized in that, The number of Z-axis slide rails is three, and the three Z-axis slide rails are laid parallel to each other on the bed. The Z-axis lead screw module is located between the three Z-axis slide rails.

5. The moving column type head-to-head boring and milling machining center according to claim 3, characterized in that, The number of X-axis slide rails is two, and the two X-axis slide rails are laid parallel to each other on the upper surface of the slide block. The X-axis lead screw module is located between the two X-axis slide rails.

6. The moving column type head-to-head boring and milling machining center according to claim 1, characterized in that, Each machining unit further includes a spindle box, a Y-axis lead screw module, and a Y-axis hard rail. The Y-axis lead screw module and the Y-axis hard rail are mounted on the front of the column. The spindle box is slidably connected to the Y-axis hard rail. The spindle box is driven by the Y-axis lead screw module to achieve feed motion in the Y-axis direction.

7. The moving column type head-to-head boring and milling machining center according to claim 6, characterized in that, The number of Y-axis rigid rails is two, and the two Y-axis rigid rails are laid parallel to each other on the front of the column. The Y-axis lead screw module is located between the two Y-axis rigid rails.

8. The moving column type head-to-head boring and milling machining center according to claim 1, characterized in that, The bed is a box-shaped structure cast in one piece.

9. A moving column type head-to-head boring and milling machining center according to claim 8, characterized in that, The bottom of the bed is equipped with multiple leveling feet for installation.

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