Swiss-type machine tool body with longitudinal bearing structure

Abstract

The invention provides a center-moving type lathe bed structure with a longitudinal bearing structure, which comprises a lathe bed, the upper surface of which is provided with a knife rest mounting area in the middle, and a main shaft mounting area and an auxiliary main shaft mounting area which are positioned on the left and right sides; the longitudinal bearing structure is formed below the tool rest mounting area and integrally formed with the lathe bed, and the longitudinal bearing structure extends downwards to the lower portion of the lathe bed in the height direction of the lathe bed and is connected with a lower structure of the lathe bed; the crossed bearing partition plate structures are arranged on the two sides of the longitudinal bearing structure and below the main shaft mounting area and the auxiliary main shaft mounting area, and each crossed bearing partition plate structure is composed of a plurality of sets of partition plates which are arranged in a crossed mode. The lathe body structure of the lathe can give consideration to high static rigidity and good dynamic response characteristics under the working conditions of high speed and multi-tool-position cutting, so that the machining stability, the machining precision and the whole machine reliability of the center-sliding lathe are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and specifically to a sliding headstock machine tool bed with a longitudinal load-bearing structure. Background Technology

[0002] In the machining process of a sliding headstock lathe, the tool post, as the core component that directly performs cutting, continuously bears the cutting load from the workpiece. This load is characterized by large amplitude, high frequency of change, and complex direction. Especially under multi-tool synchronous cutting and high-speed reciprocating motion of the spindle, the tool post area forms a significant concentrated load source, which places higher demands on the load-bearing capacity, force transmission stability, and dynamic rigidity of the lathe bed structure.

[0003] In existing sliding headstock lathe bed structures, bed rigidity is typically improved by methods such as overall bed thickening, adding local reinforcing ribs, or adopting a closed box structure. For example, Chinese patent CN205309308U discloses a bed structure that improves overall rigidity by setting multiple transverse and longitudinal stiffeners. However, the above structural designs mostly focus on static strength or local rigidity enhancement, failing to clearly define and classify the source of the tool post cutting load and its transmission path within the bed from a mechanical organization perspective. This results in the cutting load spreading or being transmitted uncontrollably within the bed, easily leading to force coupling and local stress concentration in non-cutting main load-bearing areas such as the guide rail load area and the main bearing load area. This, in turn, causes problems such as torsional deformation of the bed, local fatigue, vibration amplification, and decreased machining stability. Summary of the Invention

[0004] The present invention aims to overcome the above-mentioned defects of the prior art and provide a sliding headstock lathe bed structure with longitudinal load-bearing structure, which has the tool post as the main load-bearing source and can clearly organize and zonally constrain the transmission path of cutting load inside the bed. By decoupling the main cutting load from the guide rail load-bearing function at the structural level, the overall rigidity, dynamic stability and machining accuracy of the bed are improved from the mechanical organization essence.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This application provides a sliding headstock lathe bed structure with a longitudinal load-bearing structure, including: The bed has a tool post mounting area in the middle and a main spindle mounting area and a sub-spindle mounting area on the left and right sides of its upper surface. A longitudinal load-bearing structure is formed below the tool holder mounting area and integrally formed with the bed. The longitudinal load-bearing structure extends downward along the height direction of the bed to the lower part of the bed and is connected to the lower structure of the bed. A cross-bearing partition structure is disposed on both sides of the longitudinal bearing structure and below the main shaft mounting area and the secondary main shaft mounting area. The cross-bearing partition structure is composed of multiple sets of cross-arranged partitions.

[0006] In one alternative embodiment, both the main spindle mounting area and the auxiliary spindle mounting area include a guide rail mounting position, a motor mounting position, and a tail end support mounting position. The guide rail mounting position extends along the width direction of the bed, and a guide rail support platform is also provided below the guide rail mounting position. The motor mounting position and the tail end support mounting position are respectively located at both ends of the guide rail support platform along its length direction.

[0007] In one alternative embodiment, the guide rail support platform is U-shaped, and the guide rail mounting position, motor mounting position, and tail end support mounting position are all a pair. The two guide rail mounting positions are located at the top of the U-shape of the guide rail support platform, and the two motor mounting positions and tail end support mounting positions are located in the middle of the U-shape of the guide rail support platform, and are symmetrically arranged along the central axis of the length direction of the guide rail support platform.

[0008] In one alternative embodiment, auxiliary oil and chip removal holes are provided on both the main spindle mounting area and the sub-spindle mounting area, and the auxiliary oil and chip removal holes are provided through the guide rail support table and the bed.

[0009] In one alternative embodiment, the bed frame is provided with multiple internal cross-shaped partition structures on both sides, which divide the two sides of the bed frame into multiple compartments and form a load-bearing network in the width direction through geometric cross arrangement.

[0010] In one alternative embodiment, the cross-shaped partition structure inside the housing has multiple first circular through holes located near the upper part of the bed.

[0011] In one alternative embodiment, the interior of the longitudinal bearing structure is provided with a plurality of vertical slots along the height direction.

[0012] In one alternative embodiment, the interior of the longitudinal bearing structure is provided with a plurality of second circular through holes along the horizontal direction.

[0013] In one alternative embodiment, the bottom of the bed frame is provided with multiple foot mounting areas.

[0014] In one alternative embodiment, the end of the bed is provided with an end component mounting cavity, and the periphery of the end component mounting cavity is provided with an integrally formed mounting reinforcement frame, the mounting reinforcement frame having multiple mounting holes. The beneficial effects of this invention are as follows: (1) By setting a longitudinal bearing structure below the tool holder mounting area, the cutting load forms a clear, continuous and controllable main transmission path along the height direction of the bed, avoiding the disorderly diffusion of the cutting load in the middle area of ​​the bed, and significantly improving the overall bearing capacity and rigidity of the bed from a structural perspective.

[0015] (2) By setting up a cross-bearing partition structure below the main spindle and sub-spindle bearing load area, the reaction force generated by the operation of the main spindle and sub-spindle system can be effectively diffused and distributed in the width direction of the bed, thereby reducing the force coupling between the guide rail bearing area and the main cutting load, and improving the local stiffness and running stability of the guide rail area.

[0016] (3) By setting directional slot structures in the longitudinal bearing structure and circular through holes in the partition structure inside the box, the stiffness distribution and mass distribution of different bearing levels of the bed can be optimized without destroying the continuity of the main bearing path. This is beneficial to relieve thermal stress and improve the structural stability of the bed under thermal change conditions.

[0017] (4) Through the above-mentioned mechanical organization, the bed can simultaneously take into account high static stiffness and good dynamic response characteristics under high-speed and multi-tool cutting conditions, thereby effectively improving the machining stability, machining accuracy and overall reliability of the Swiss-type lathe. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the bed provided in an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the back of the bed; Figure 3 It is a cross-sectional structural diagram of the bed along its length and vertical direction; Figure 4 It is a cross-sectional structural diagram of the bed along its length and horizontal direction.

[0020] Figure label: 1-Spindle guide rail mounting position; 2-Spindle motor mounting position; 3-Spindle tail end support; 4-Tool post mounting area; 5-Longitudinal load-bearing structure; 6-Guide rail support platform; 7-Auxiliary oil and chip removal holes; 8-Cross partition structure inside the housing; 9-Foot mounting area; 10-End component mounting cavity; 11-Cross load-bearing partition structure; 12-First circular through hole; 13-Vertical slot; 14-Second circular through hole; 15-Mounting reinforcing frame; 16-Mounting hole. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0025] This application provides a sliding headstock lathe bed structure with a longitudinal load-bearing structure, such as... Figure 1 and Figure 2 As shown, the upper surface of the machine bed has a tool post mounting area 4 in the middle, and main spindle mounting areas and sub-spindle mounting areas on the left and right sides. Both the main spindle mounting area and the sub-spindle mounting area include guide rail mounting positions, motor mounting positions, and tailstock support mounting positions. The guide rail mounting positions extend along the width of the machine bed and provide linear guidance for the main spindle assembly and sub-spindle assembly. These positions primarily provide guidance and reaction force support during the operation of the main spindle and sub-spindle systems, rather than serving as the main load-bearing path for the tool post cutting load. A guide rail support platform 6 is also provided below the guide rail mounting positions to improve the local stiffness of the guide rail area, thereby bearing the reaction load generated by the operation of the main spindle system and maintaining the structural stability of the guide rail area, thus preventing the main spindle reaction force from mechanically coupling with the main cutting load of the tool post inside the machine bed. The motor mounting positions and tailstock support mounting positions are located at both ends of the guide rail support platform 6 along its length.

[0026] Specifically, the main spindle mounting area includes a main spindle guide rail mounting position 1, a main spindle motor mounting position 2, and a main spindle tail end support mounting position 3; the sub-spindle mounting area is structurally configured to correspond to the main spindle mounting area and is used to install the sub-spindle assembly and its drive and support components.

[0027] Preferably, the guide rail support platform 6 is U-shaped, with a pair of guide rail mounting positions, motor mounting positions, and tail end support mounting positions. The two guide rail mounting positions are located at the top of the U-shape of the guide rail support platform 6, and the two motor mounting positions and tail end support mounting positions are located in the middle of the U-shape of the guide rail support platform 6, and are symmetrically arranged along the central axis of the guide rail support platform 6 along its length.

[0028] Preferably, auxiliary oil and chip removal holes 7 are provided in both the main spindle mounting area and the sub-spindle mounting area. The auxiliary oil and chip removal holes 7 are provided through the guide rail support table 6 and the bed, and are used to guide and discharge the coolant, lubricating oil and small chips accumulated inside the bed.

[0029] Preferably, the two sides of the bed are provided with multiple internal cross-shaped partition structures 8. The internal cross-shaped partition structures 8 divide the two sides of the bed into multiple cavities, which are geometrically intersected to form a load-bearing network in the width direction. This is used to improve the overall bending stiffness and torsional stiffness of the bed, and to provide stable structural support for the guide rail load-bearing area and the longitudinal load-bearing structure 5, while reducing the vibration of the bed during the processing.

[0030] Furthermore, the cross-shaped partition structure 8 inside the box body has multiple first circular through holes 12 located near the upper part of the bed. This location is a low-stress area and does not coincide with the main load-bearing path of the tool post support column. The first circular through holes 12 are used to optimize the overall mass distribution of the bed and reduce the thermal inertia of the box structure, thereby improving the thermal stability and manufacturing reliability of the bed without significantly reducing the overall stiffness.

[0031] Preferably, the bottom of the bed is provided with multiple foot mounting areas 9 for fixing the bed to the foundation, so that the bed remains stable as a whole during processing and the load borne by the bed is transferred to the foundation.

[0032] Preferably, the end of the bed is provided with an end component mounting cavity 10, and the periphery of the end component mounting cavity 10 is provided with an integrally formed mounting reinforcement frame 15. The mounting reinforcement frame 15 is provided with a plurality of mounting holes 16. The end functional components or closing components are mounted on the mounting reinforcement frame 15 through the mounting holes 16. At the same time, the mounting reinforcement frame 15 is also used to compensate for the impact of the end opening on the rigidity of the bed structure.

[0033] Preferably, the tool post mounting area 4 is located in the middle of the upper surface of the machine bed, serving as the main input area for cutting loads. Below the tool post mounting area 4, a longitudinal load-bearing structure 5 is integrally formed with the main body of the machine bed. The longitudinal load-bearing structure 5 consists of the tool post mounting area 4 and the solid structure integrally formed with the main body of the machine bed below it, extending downwards along the height of the machine bed and connecting to the lower structure of the machine bed. The cutting load generated by the tool post during machining is mainly transmitted downwards along the height of the machine bed via the longitudinal load-bearing structure 5, thereby forming a clear, continuous, and controllable main load-bearing path within the machine bed. Through the aforementioned longitudinal load-bearing structure 5, the cutting load generated by the tool post during machining can be prevented from spreading disorderly in the middle region of the machine bed, and its load-bearing function is structurally separated from that of the spindle guide area, thereby improving the overall load-bearing efficiency and structural stability of the machine bed.

[0034] Specifically, such as Figure 3 and Figure 4 As shown, a longitudinal bearing structure 5 for the tool post is provided in the middle of the bed along the height direction. The upper end is connected to the tool post mounting area 4, and the lower end is integrally connected to the lower structure of the bed. The longitudinal bearing structure 5 for the tool post serves as the only longitudinal transmission component for the main cutting load, forming a clear main bearing channel in the middle of the bed.

[0035] Furthermore, within the longitudinal bearing structure 5 of the tool holder, multiple vertical slots 13 are formed along the height direction, and multiple second circular through holes 14 are formed along the horizontal direction. The vertical slots 13 are aligned with the longitudinal bearing direction, forming a continuous cavity extending along the height direction. The second circular through holes 14 are orthogonal to the longitudinal main flow direction and are circular to avoid stress concentration. The opening of the vertical slots 13 and the second circular through holes 14 does not interrupt the continuous force path of the column in the longitudinal bearing direction. Without disrupting the continuity of the main bearing path, the stiffness and mass distribution of different bearing levels of the bed are optimized, which is beneficial for mitigating thermal stress and improving the structural stability of the bed under thermal change conditions.

[0036] Preferably, the bed structure of the sliding headstock lathe also includes a cross-bearing partition structure 11, which is disposed on both sides of the longitudinal bearing structure 5 and below the main spindle mounting area and the sub-spindle mounting area. The cross-bearing partition structure 11 is composed of multiple sets of cross-arranged partitions, without holes or slots. It forms a high out-of-plane stiffness bearing network through geometric cross-shape, bears the reaction force generated by the operation of the main spindle and sub-spindle system, and diffuses the bearing in the width direction of the bed, thereby reducing the force coupling between the guide rail bearing area and the main cutting load, improving the local stiffness and running stability of the guide rail area, and improving the ability of this area to resist vertical deformation and torsional deformation.

[0037] The sliding headstock lathe bed structure provided in this application embodiment can simultaneously achieve high static stiffness and good dynamic response characteristics under high-speed, multi-tool cutting conditions, thereby effectively improving the machining stability, machining accuracy and overall reliability of the sliding headstock lathe.

[0038] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0039] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A sliding headstock lathe bed structure with a longitudinal load-bearing structure, characterized in that, include: The bed has a tool post mounting area in the middle and a main spindle mounting area and a sub-spindle mounting area on the left and right sides of its upper surface. A longitudinal load-bearing structure is formed below the tool holder mounting area and integrally formed with the bed. The longitudinal load-bearing structure extends downward along the height direction of the bed to the lower part of the bed and is connected to the lower structure of the bed. A cross-bearing partition structure is disposed on both sides of the longitudinal bearing structure and below the main shaft mounting area and the secondary main shaft mounting area. The cross-bearing partition structure is composed of multiple sets of cross-arranged partitions.

2. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, Both the main spindle mounting area and the auxiliary spindle mounting area include a guide rail mounting position, a motor mounting position, and a tail end support mounting position. The guide rail mounting position extends along the width direction of the bed, and a guide rail support platform is also provided below the guide rail mounting position. The motor mounting position and the tail end support mounting position are respectively located at both ends of the guide rail support platform along its length direction.

3. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 2, characterized in that, The guide rail support platform is U-shaped. The guide rail mounting position, motor mounting position, and tail end support mounting position are all a pair. The two guide rail mounting positions are located at the top of the U-shape of the guide rail support platform, and the two motor mounting positions and tail end support mounting positions are located in the middle of the U-shape of the guide rail support platform, and are symmetrically arranged along the central axis of the length direction of the guide rail support platform.

4. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 2, characterized in that, Both the main spindle mounting area and the sub-spindle mounting area are provided with auxiliary oil and chip removal holes, which are provided through the guide rail support table and the bed.

5. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, The bed frame is provided with multiple internal cross-shaped partition structures on both sides. These internal cross-shaped partition structures divide the two sides of the bed frame into multiple compartments, which are geometrically arranged to form a load-bearing network in the width direction.

6. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 5, characterized in that, The cross-shaped partition structure inside the box has multiple first circular through holes located near the upper part of the bed.

7. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, The longitudinal bearing structure has multiple vertical slots along its height.

8. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, The longitudinal load-bearing structure has multiple second circular through holes opened horizontally inside.

9. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, The bottom of the bed is provided with multiple foot mounting areas.

10. The sliding headstock lathe bed structure with longitudinal load-bearing structure according to claim 1, characterized in that, The end of the bed is provided with an end component mounting cavity, and the periphery of the end component mounting cavity is provided with an integrally formed mounting reinforcement frame, and the mounting reinforcement frame is provided with multiple mounting holes.

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