A gantry comprehensive machining center structure for improving machining precision

Abstract

The utility model discloses a kind of gantry comprehensive machining center structures for improving machining precision, to provide a kind of gantry comprehensive machining center of improving precision, its technical solution main point is, including base, the vertical column being equipped on the base, the horizontal beam is further equipped on the vertical column, the slide rest that the horizontal beam is equipped with can move horizontally, the workstation that the base is further equipped with and the base longitudinal sliding connection, the vertical column and the horizontal beam between still be equipped with reinforcing device, the reinforcing device includes the L type reinforcing rib plate of being arranged in vertical column top inner side and the transverse tensioning assembly of being arranged in horizontal beam both ends and vertical column side wall junction, the L type reinforcing rib plate side is fixed by bolt with vertical column side wall, other side and horizontal beam bottom are pasted, and wear-resistant alloy spacer is arranged between pasting surface.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing equipment technology, specifically to a gantry machining center structure for improving machining accuracy. Background Technology

[0002] As a core piece of equipment for machining large parts, the structural stability and precision of a gantry machining center directly determine the quality of the machined workpieces. Existing gantry machining centers commonly exhibit the following problems during long-term use: 1. Insufficient stability of the connection between the crossbeam and the column: Traditional crossbeams are directly bolted to the top of the column. Under high-speed machining or when subjected to large cutting forces, slight displacements easily occur, leading to a decrease in machining accuracy. This is especially noticeable for workpieces with large length-to-diameter ratios, where the accumulated errors are more pronounced. 2. Poor vibration damping of the worktable: The vibration damping structure between the worktable and the base often uses a single spring or rubber pad, which cannot dynamically adjust the damping intensity according to the machining load. When the machining load changes, vibration is easily transmitted, affecting the surface roughness and dimensional accuracy of the machined parts. 3. Low guide accuracy of the ram: When the ram moves on the crossbeam guide rail, traditional guide structures are mostly double-sided linear guide rails. After long-term, high-frequency movement, guide rail wear easily leads to ram displacement, and the lack of a real-time compensation mechanism makes it difficult to maintain stable guide accuracy.

[0003] Currently, Chinese patent CN116214231A discloses a high-precision fixed-beam five-axis gantry machining center, which includes: a fixed frame; a base body, which is vertically slidably connected to the fixed frame; a slide rod, which is horizontally slidably connected to the base body; a clamping head, which is fixedly connected to one end of the slide rod; a rod body, which is slidably connected to the fixed frame, the sliding direction of the rod body relative to the fixed frame is the same as the sliding direction of the slide rod relative to the base body, and the rod body and the slide rod are vertically slidably connected; and a drive mechanism, which is used to intermittently drive the horizontal sliding of the rod body and the vertical sliding of the base body, so as to switch the tool between the electric spindle and the tool magazine.

[0004] Although this high-precision fixed-beam five-axis gantry machining center uses intermittent drive mechanisms to drive the horizontal sliding of the rod and the vertical sliding of the base, and through the cooperation between various components, it can load and unload tools from the electric spindle or tool magazine and transfer tools, thereby enabling the cleaver head to switch tools between the electric spindle and the tool magazine. Tool changing is convenient and quick, and operation is simple, but it often still cannot meet the corresponding requirements in terms of machining accuracy. Summary of the Invention

[0005] The purpose of this utility model is to provide a gantry machining center structure for improving machining accuracy. It has the advantages of significantly improving machining accuracy by optimizing the connection structure between the crossbeam and the column, improving the vibration reduction structure of the worktable and the guide compensation structure of the slide block.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A gantry machining center structure for improving machining accuracy includes a base, a column on the base, a crossbeam on the column, a laterally movable slide on the crossbeam, a worktable slidably connected longitudinally to the base, and a reinforcing device between the column and the crossbeam. The reinforcing device includes an L-shaped reinforcing rib plate on the inner side of the top of the column and a transverse tensioning assembly at the connection points between the crossbeam and the column sidewall. One side of the L-shaped reinforcing rib plate is fixed to the column sidewall by bolts, and the other side is fitted to the bottom of the crossbeam, with a wear-resistant alloy gasket between the mating surfaces. The transverse tensioning assembly includes a tension bolt, a disc spring, and a pressure sensor. The tension bolt passes through the column sidewall and is threaded to the end of the crossbeam. The disc spring is sleeved on the outside of the tension bolt, and the pressure sensor is located between the column sidewall and the disc spring.

[0007] Further features: The workbench is also equipped with a multi-stage shock absorption device, which includes an elastic rubber layer, a metal damping layer and a gas spring shock absorption layer placed sequentially from top to bottom between the bottom of the workbench and the base.

[0008] Further feature: honeycomb-shaped air pores are formed on the surface of the elastic rubber layer.

[0009] Further configuration: The metal damping layer consists of two steel plates and an intermediate viscous damping material.

[0010] Further configuration: The gas spring damping layer includes at least 4 evenly distributed gas springs, the top of which is fixed to the bottom of the metal damping layer, the bottom of which is connected to the top of the base, and each gas spring is equipped with a pressure regulating valve.

[0011] In summary, this utility model has the following beneficial effects: stability is significantly improved, and the combination of L-shaped reinforcing ribs and transverse tensioning components, along with the pressure sensor monitoring the preload in real time, prevents displacement caused by loose bolts; vibration damping effect is optimized, and low-frequency vibrations can be precisely damped through dynamic adjustment of the gas spring. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the overall structure of a gantry machining center designed to improve machining accuracy. Figure 2 This is a schematic diagram of a structural reinforcement device for a gantry machining center used to improve machining accuracy. Figure 3This is a schematic diagram of a multi-stage vibration damping device for a gantry machining center used to improve machining accuracy.

[0014] In the diagram, 1. Base; 2. Column; 3. Crossbeam; 4. Slide; 5. Workbench; 6. Reinforcing device; 61. L-shaped reinforcing rib; 62. Tensioning assembly; 621. Tensioning bolt; 622. Disc spring; 623. Pressure sensor; 63. Wear-resistant alloy gasket; 7. Multi-stage damping device; 71. Elastic rubber layer; 72. Metal damping layer; 73. Gas spring damping layer; 8. Ventilation hole; 9. Gas spring; 10. Pressure regulating valve. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0016] The technical solution adopted in this utility model is: a gantry machining center structure for improving machining accuracy, such as... Figure 1 , Figure 2 and Figure 3 As shown, the system includes a base 1, a column 2 on the base 1, a crossbeam 3 on the column 2, a laterally movable slide block 4 on the crossbeam 3, and a worktable 5 that is longitudinally slidably connected to the base 1. An L-shaped reinforcing rib plate 61 is fixed to the inner side of the top of the column 2. One side of the L-shaped reinforcing rib plate 61 is bolted to the side wall of the column 2, and the other side is attached to the bottom of the crossbeam 3. A wear-resistant alloy gasket 63 is sandwiched between the contact surfaces. A transverse tensioning assembly 62 is installed between the two ends of the crossbeam 3 and the side wall of the column 2. The tensioning bolt 621 in the tensioning assembly 62 passes through the column 2 and is threadedly connected to the crossbeam 3. A disc spring 622 is sleeved on the outside of the assembly. A pressure sensor 623 is embedded between the side wall of the column 2 and the disc spring 622. From top to bottom, an elastic rubber layer 71, a metal damping layer 72, and a gas spring shock-absorbing layer 73 are stacked between the bottom of the workbench 5 and the base 1. The elastic rubber layer 71 is directly attached to the bottom of the workbench 5, the metal damping layer 72 is located between the rubber layer and the gas spring shock-absorbing layer 73, and the gas springs 9 are evenly distributed at the bottom of the metal damping layer 72 and the top of the base 1. Each gas spring 9 is equipped with a pressure regulating valve 10. Its main working principle is as follows: When the equipment is running, the reinforced connection device ensures the stability of the frame and avoids displacement under processing force; the L-shaped reinforcing rib plate 61 enhances the support rigidity of the column 2 and the crossbeam 3, the transverse tensioning component 62 provides continuous pre-tightening force through the disc spring 622, and the pressure sensor 623 monitors the magnitude of the pre-tightening force in real time to prevent the crossbeam 3 from shifting due to loose bolts and ensure connection stability; the multi-level shock absorption structure of the worktable 5 weakens the transmission of processing vibration and protects the surface accuracy of the workpiece; the elastic rubber layer 71 absorbs high-frequency micro vibration, the metal damping layer 72 suppresses the transmission of medium-frequency vibration, and the gas spring shock absorption layer 73 dynamically adjusts the pressure through the pressure regulating valve 10 to offset low-frequency large-amplitude vibration. The three-layer structure works together to cover multi-frequency vibration and reduce the impact of vibration on processing accuracy.

[0017] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the utility model's technical solution.

Claims

1. A gantry machining center structure for improving machining accuracy, comprising a base (1), a column (2) provided on the base (1), a crossbeam (3) provided on the column (2), a ram (4) that can move laterally provided on the crossbeam (3), and a worktable (5) that is longitudinally slidably connected to the base (1) on the base (1), characterized in that: A reinforcing device (6) is also provided between the column (2) and the crossbeam (3). The reinforcing device (6) includes an L-shaped reinforcing rib plate (61) set on the inner side of the top of the column (2) and a transverse tensioning assembly (62) set at the connection between the two ends of the crossbeam (3) and the side wall of the column (2). One side of the L-shaped reinforcing rib plate (61) is fixed to the side wall of the column (2) by bolts, and the other side is attached to the bottom of the crossbeam (3), and a wear-resistant alloy gasket (63) is set between the contact surfaces. The transverse tensioning assembly (62) includes a tension bolt (621), a disc spring (622) and a pressure sensor (623). The tension bolt (621) passes through the side wall of the column (2) and is threaded to the end of the crossbeam (3). The disc spring (622) is sleeved on the outside of the tension bolt (621). The pressure sensor (623) is located between the side wall of the column (2) and the disc spring (622).

2. The gantry machining center structure for improving machining accuracy according to claim 1, characterized in that, The workbench (5) is also provided with a multi-stage shock absorption device (7). The multi-stage shock absorption device (7) of the workbench (5) includes an elastic rubber layer (71), a metal damping layer (72) and a gas spring shock absorption layer (73) placed between the bottom of the workbench (5) and the base (1) from top to bottom.

3. The gantry machining center structure for improving machining accuracy according to claim 2, characterized in that, The surface of the elastic rubber layer (71) has honeycomb-shaped air pores (8).

4. The gantry machining center structure for improving machining accuracy according to claim 3, characterized in that, The metal damping layer (72) consists of two steel plates and a viscous damping material in the middle.

5. The gantry machining center structure for improving machining accuracy according to claim 4, characterized in that, The gas spring damping layer (73) includes at least 4 evenly distributed gas springs (9), the top of the gas springs (9) is fixed to the bottom of the metal damping layer (72), the bottom is connected to the top of the base (1), and each gas spring (9) is equipped with a pressure regulating valve (10).

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