Compact lathe bed structure of numerical control machine tool

Abstract

The invention relates to the technical field of metal processing machine tools, in particular to a compact numerical control machine tool body structure which comprises a rack, a tool apron mounting table fixed to the rack, an auxiliary spindle mounting seat fixed to the middle of the rack and a spindle mounting seat fixed to one end of the rack, and the spindle mounting seat and the auxiliary spindle mounting seat are oppositely arranged; the tool apron mounting table is arranged in the length direction of the rack and located on the side of the rack. The side, close to the outer wall of the rack, of the tool apron mounting table protrudes upwards. The middle of the machine frame is provided with a downwards-sunken conical surface groove, and the auxiliary main shaft installation base is located in the conical surface groove. An auxiliary main shaft sliding rail mounting surface is fixed on the auxiliary main shaft mounting seat; a tool apron sliding rail mounting surface is arranged on the tool apron mounting table; the length of the tool apron sliding rail installation face is larger than that of the auxiliary main shaft sliding rail installation face, and the length of the tool apron sliding rail installation face is larger than half of the length of the machine frame. The device is compact in structure, small in size, long in machining range and capable of reducing cutting vibration, improving the machining precision and guaranteeing the machining quality.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing machine tools, in particular to a bed structure of a compact CNC machine tool. Background Art

[0002] The machine tool bed is the basic supporting component of the machine tool. Its structural design plays a decisive role in the overall performance of the machine tool, and is related to key indicators such as processing accuracy, stability, rigidity and service life.

[0003] Traditional flat-bed CNC machine tools have good processability and are convenient for guide rail surface processing. They are used in the layout of large CNC lathes or small precision CNC lathes. However, this structure has obvious disadvantages, such as the narrow space under the bed, which makes chip removal extremely difficult. Chips easily accumulate on the guide rails, which not only affects the processing accuracy, but also accelerates the wear of the guide rails. In order to overcome the defects of the flat bed, inclined bed CNC lathes came into being. The inclined bed design has a larger cross-sectional area than the flat bed of the same specification, and has stronger bending and torsion resistance, and can better withstand cutting forces. For example, the prior art "inclined bed double-spindle double-row CNC machine tool capable of realizing spindle docking processing" (publication number: CN109202138A) adopts an inclined design for the bed and saddle, which not only meets the needs of large parts processing, but also overcomes gravity and has better stability; improves space utilization; and is conducive to chip removal. However, the prior art still has the following technical problems: Limited processing range: The position of the tool in the existing technology is fixed relative to the bed, and the tool can only move in the front-to-back direction between the two chucks, but cannot move in the left-right direction. Therefore, the processing position and range of the tool are very limited. When facing long shaft parts with long lengths, it may be necessary to rely on clamping the workpiece multiple times to complete the processing of all parts, resulting in low processing efficiency, and positioning errors are easily generated during the second clamping, thereby reducing the processing accuracy. Summary of the Invention

[0004] The present invention provides a bed structure for a compact CNC machine tool, which can solve the problems of small processing range of machine tools in the prior art. When processing long shaft parts with long lengths, multiple clamping is required to complete the processing, which easily leads to low processing efficiency and insufficient processing accuracy.

[0005] The present application provides the following technical solution: a bed structure of a compact CNC machine tool, comprising a machine frame, a tool holder mounting platform fixed to the machine frame, a sub-spindle mounting seat fixed to the middle of the machine frame, and a main spindle mounting seat fixed to the frame, wherein the main spindle mounting seat and the sub-spindle mounting seat are arranged opposite to each other; The knife seat mounting platform is arranged along the length direction of the frame and is located at the side of the frame; the side of the knife seat mounting platform close to the outer wall of the frame is raised upward; A downwardly concave conical groove is provided in the middle of the frame, and the sub-spindle mounting seat is located in the conical groove; A sub-spindle slide rail mounting surface is fixed on the sub-spindle mounting seat, and a tool holder slide rail mounting surface is provided on the tool holder mounting platform; the length of the tool holder slide rail mounting surface is greater than the length of the sub-spindle slide rail mounting surface, and the length of the tool holder slide rail mounting surface is greater than half the length of the frame.

[0006] Beneficial effects: 1. Make full use of the frame space and ensure processing efficiency. The tool holder mounting platform is arranged to extend along the length of the frame, and the tool holder mounting platform is located on the side of the frame, and the length of the tool holder slide rail mounting surface is greater than half the length of the frame, which can fully utilize the overall length space of the frame, ensure the compactness of the frame structure, and enable the tool holder to have an optimal moving range along the length of the frame, so that the tool has sufficient processing range to process long axis parts, so that the workpiece can be processed in place after one clamping, and there is no need to clamp the workpiece multiple times to adjust the workpiece to the processing range of the tool as in the existing technology, thereby effectively improving processing efficiency. In addition, it can also avoid the problem of reduced processing accuracy caused by different positioning datums caused by multiple clamping; and the design of the tool holder slide rail mounting surface being longer than the sub-spindle slide rail mounting surface makes full use of the sliding stroke of the tool holder slide rail mounting surface, and the sub-spindle assembly installed on the sub-spindle slide rail mounting surface will not interfere with the sliding stroke of the tool holder in the sliding stroke, thereby improving the safety and stability of the machine tool processing process.

[0007] 2. Reduce vibration and deformation, ensure machining accuracy, and improve machining quality. The side of the toolholder mounting platform close to the outer wall of the frame is raised upward. On the one hand, this makes the cross-section of the toolholder mounting platform form a triangular structure, which improves the strength and rigidity of the toolholder mounting platform, reduces tool vibration during cutting, and improves stability. On the other hand, it also allows the toolholder slide rail mounting surface to tilt at a certain angle toward the sub-spindle mounting seat. In this way, part of the tool load during cutting is offset by the gravity of the tilted toolholder, thereby further reducing tool vibration during cutting, improving machining stability and machining accuracy, and ensuring machining quality.

[0008] 3. Reduce the size of the machine tool and improve the compactness of the structure. A concave conical groove is set in the middle of the frame, and the sub-spindle mounting seat is placed in the conical groove, so that the sub-spindle mounting seat is sunken into the frame, thereby lowering the center of gravity of the sub-spindle mounting seat and reducing the overall installation height of the sub-spindle assembly on the sub-spindle mounting seat, compressing the machine tool volume and improving the compactness of the structure. The shape of the conical groove allows the iron chips after cutting to fall smoothly under the frame, improving the chip removal capacity.

[0009] Furthermore, the distance between the auxiliary spindle mounting seat and the main spindle mounting seat is greater than the distance between the end of the auxiliary spindle mounting seat away from the main spindle mounting seat and the side surface of the frame.

[0010] Beneficial effect: the tool processing area is between the sub-spindle mounting seat and the main spindle mounting seat. The spacing in this area is set larger, which makes the tool processing range wider, thereby improving the machine tool's processing capability for long axes. At the same time, the sub-spindle mounting seat is farther away from the main spindle mounting seat, which is conducive to the iron chips after cutting falling into the conical groove below, thereby improving the chip removal capability.

[0011] Furthermore, an arc-shaped groove is provided at the bottom of the sub-spindle mounting seat.

[0012] Beneficial effect: The curved surface structure of the arc groove enables the sub-spindle mounting seat to form an arched support structure, which can reduce the volume and weight of the sub-spindle mounting seat while ensuring the strength of the sub-spindle mounting seat. Furthermore, reinforcement blocks are fixed on both sides of the secondary spindle mounting seat.

[0013] Beneficial Effects: The reinforcement block increases the support area and connection strength of the sub-spindle mounting base, enhancing its overall resistance to deformation. This reduces twisting or deflection of the sub-spindle mounting base, particularly when subjected to loads such as cutting forces and torque, ensuring a stable position during machining. Furthermore, the reinforcement block reduces the vibration sensitivity of the mounting base. By strengthening the structural connection, the risk of resonance is reduced, reducing vibration amplitude during high-speed cutting or heavy-load machining, thereby improving surface quality and reducing abnormal noise.

[0014] Furthermore, an inclined groove is provided in the middle of the tool holder mounting platform, and a plurality of reinforcing ribs are fixed in the inclined groove.

[0015] Beneficial effects: The chute structure reduces the overall weight of the tool holder mounting platform by removing material from non-load-bearing areas. Internal reinforcement ribs form a "skeleton-like" support, maintaining the rigidity of key areas and avoiding a decrease in structural strength due to weight reduction, while also taking into account the flexibility and load-bearing capacity of the machine tool's moving parts.

[0016] Furthermore, a screw mounting block is provided in the inclined groove of the tool holder mounting platform, a screw mounting hole is provided on the screw mounting block, and the screw mounting blocks are located on both sides of the reinforcing rib.

[0017] Beneficial effects: The reinforcing ribs provide a rigid support base for the screw mounting block, reducing the displacement or deformation of the screw due to force during transmission, ensuring the straightness and accuracy of the screw movement. The screw mounting blocks are independently arranged on both sides of the reinforcing ribs, providing a clear positioning reference, facilitating quick alignment and fixation during assembly, and reducing installation errors; at the same time, the modular design makes subsequent maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric view of the structure of the present invention. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods: The marks in the drawings of the specification include: frame 1, conical groove 2, sub-spindle mounting seat 3, sub-spindle slide rail mounting surface 4, groove 5, tool holder mounting platform 6, screw mounting block 7, screw mounting hole 8, tool holder slide rail mounting surface 9, reinforcing rib 10, reinforcing block 11, inclined groove 12, spindle mounting seat 13, arc groove 14.

[0020] Example 1 like Figure 1 As shown, a bed structure of a compact CNC machine tool includes a frame 1, a tool holder mounting platform 6 fixed on the frame 1, a sub-spindle mounting seat 3 fixed in the middle of the frame 1 and a spindle mounting seat 13 fixed on the frame 1, and the spindle mounting seat 13 is arranged opposite to the sub-spindle mounting seat 3; the tool holder mounting platform 6 is arranged along the length direction of the frame 1, and the tool holder mounting platform 6 is located on the side of the frame 1. like Figure 1 As shown, the side of the toolholder mounting platform 6 closest to the outer wall of the machine frame 1 is raised upward, forming a triangular cross-section. This improves the strength and rigidity of the toolholder mounting platform 6. A transverse beveled slot 12 is provided in the center of the toolholder mounting platform 6, within which multiple reinforcing ribs 10 are fixed. The beveled slot 12 reduces the overall weight of the toolholder mounting platform 6 by removing material from non-load-bearing areas. The internal reinforcing ribs 10 form a "skeleton-like" support structure, maintaining rigidity in key areas and avoiding a decrease in structural strength due to weight reduction, while ensuring both the flexibility and load-bearing capacity of the machine tool's moving parts.

[0021] Screw mounting blocks 7 are also located within the inclined slot 12 of the toolholder mounting platform 6. These blocks are located on either side of the reinforcing rib 10 and are provided with screw mounting holes 8 for connecting the screw. The reinforcing rib 10 provides a rigid support base for the screw mounting blocks 7, reducing displacement or deformation of the screw due to force during transmission, ensuring the straightness and accuracy of the screw's movement. The screw mounting blocks 7 are independently located on either side of the reinforcing rib 10, providing a clear positioning reference, facilitating quick alignment and fixation during assembly, and reducing installation errors. Furthermore, the modular design facilitates subsequent maintenance.

[0022] like Figure 1As shown, a downwardly concave conical groove 2 is provided in the middle of the frame 1, and the sub-spindle mounting seat 3 is located in the conical groove 2; a sub-spindle slide rail mounting surface 4 is fixed to the sub-spindle mounting seat 3, and a tool holder slide rail mounting surface 9 is provided on the tool holder mounting platform 6; the length of the tool holder slide rail mounting surface 9 is greater than the length of the sub-spindle slide rail mounting surface 4, and the length of the tool holder slide rail mounting surface 9 is greater than half the length of the frame 1. The distance between the sub-spindle mounting seat 3 and the main spindle mounting seat 13 is greater than the distance between the end of the sub-spindle mounting seat 3 away from the main spindle mounting seat 13 and the side of the frame 1. The tool processing area is located between the sub-spindle mounting seat 3 and the main spindle mounting seat 13. The larger distance between this area allows for a wider tool processing range, thereby improving the machine tool's processing capability for long axes. At the same time, the further distance between the sub-spindle mounting seat 3 and the main spindle mounting seat 13 facilitates the falling of cut iron chips from the conical groove 2 below, thereby improving the chip removal capability.

[0023] The upper surface of the sub-spindle mount 3 is provided with a groove 5, which is used to subsequently accommodate the sub-spindle lead screw for assembling the drive mechanism. The bottom of the sub-spindle mount 3 is provided with an arcuate groove 14. The curved surface structure of the arcuate groove 14 gives the sub-spindle mount 3 an arched support structure, which reduces the volume and weight of the sub-spindle mount 3 while also ensuring its strength. Reinforcement blocks 11 are fixed to the two side walls of the sub-spindle mount 3, with the other end of the reinforcement block 11 fixed to the inner wall of the conical groove 2. The reinforcement blocks 11 increase the support area and connection strength of the sub-spindle mount 3, enhancing its overall anti-deformation capability. This, in particular, reduces twisting or deflection of the sub-spindle mount 3 under loads such as cutting forces and torque, ensuring a stable posture during machining. Furthermore, the reinforcement blocks 11 reduce the vibration sensitivity of the mount and, by strengthening the structural connection, reduce the risk of resonance. This reduces the vibration amplitude of the machine tool during high-speed cutting or heavy-load machining, thereby improving the surface quality of the machined surface and reducing abnormal noise.

[0024] The upper surface of the spindle mounting seat 13 is an inclined surface, and the inclined surface is arranged parallel to the sub-spindle slide mounting surface 4 and the tool holder slide mounting surface 9. The inclined surface of the spindle mounting seat 13 is parallel to the sub-spindle slide mounting surface 4, so that the loads of the relevant components of the machine tool main shaft and the relevant components of the sub-spindle can act on the same cross-section of the frame 1 as much as possible. During cutting, the force on the frame 1 is more stable and the vibration is reduced. Especially when processing eccentric workpieces, the load stress distribution difference on the frame 1 is smaller, and the overall deformation of the frame 1 is reduced, which is beneficial to improving the processing accuracy; the tool holder slide mounting surface 9 is arranged parallel to the sub-spindle slide mounting surface 4, so that the cutting direction of the tool can be cut from the oblique upper part of the workpiece, and the tool cutting load can be partially offset by the gravity of the tool holder, which is not easy to cause cutting vibration, thereby providing processing accuracy. At the same time, since the tool is in an inclined state, the iron cutting is not easy to be entangled with the tool due to gravity during cutting, which is beneficial to chip removal.

[0025] The method of using this program is as follows: The tool and tool holder of the machine tool are connected to the tool holder mounting table 6 by a sliding block, and the main spindle motor, main spindle clamp and other related components of the machine tool are fixed to the main spindle mounting seat 13 with screws; the sub-spindle motor, sub-spindle clamp and other related components are connected to the sub-spindle mounting seat 3 by a sliding block, and the chucks of the main spindle clamp and the sub-spindle clamp are relatively set, and long shaft parts can be clamped in the area between the main spindle mounting seat 13 and the sub-spindle mounting seat 3.

[0026] Since the tool holder mounting platform 6 extends along the length direction of the frame 1, and the tool holder mounting platform 6 is located on the side of the frame 1, and the length of the tool holder slide rail mounting surface 9 is greater than half the length of the frame 1, the overall length space of the frame 1 can be fully utilized, ensuring the compactness of the structure of the frame 1. At the same time, the tool holder can have an optimal moving range along the length direction of the frame 1, so that the tool has sufficient processing range to process long-axis parts, so that the workpiece can be processed in place after one-time clamping, and there is no need to clamp the workpiece multiple times to adjust the workpiece to the processing range of the tool as in the prior art, thereby effectively improving the processing efficiency. In addition, it can also avoid the problem of reduced processing accuracy caused by different positioning references due to multiple clamping; and the design of the tool holder slide rail mounting surface 9 being longer than the sub-spindle slide rail mounting surface 4 makes the sliding stroke of the tool holder slide rail mounting surface 9 fully utilized, and the sub-spindle assembly installed on the sub-spindle slide rail mounting surface 4 will not interfere with the sliding stroke of the tool holder in the sliding stroke, thereby improving the safety and stability of the machine tool processing process.

[0027] The side of the tool holder mounting platform 6 close to the outer wall of the frame 1 bulges upward. On the one hand, the cross-section of the tool holder mounting platform 6 forms a triangular structure, which improves the strength and rigidity of the tool holder mounting platform 6, reduces the vibration of the tool during cutting, and improves stability. On the other hand, it also allows the tool holder slide rail mounting surface 9 to be tilted at a certain angle toward the sub-spindle mounting seat 3. In this way, part of the load of the tool during cutting will be offset by the gravity of the tilted tool holder, thereby further reducing the tool vibration during cutting to improve processing stability and processing accuracy, and ensure processing quality.

[0028] A concave conical groove 2 is provided in the middle of the frame 1, and the sub-spindle mounting seat 3 is placed in the conical groove 2, so that the sub-spindle mounting seat 3 is sunk into the frame 1, thereby lowering the center of gravity of the sub-spindle mounting seat 3 and reducing the overall installation height of the sub-spindle assembly on the sub-spindle mounting seat 3, reducing the volume of the machine tool and improving the compactness of the structure. The shape of the conical groove 2 makes it easier for iron chips after cutting to fall smoothly under the frame 1, thereby improving the chip removal capacity.

[0029] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A bed structure of a compact CNC machine tool, characterized by: It includes a machine frame, a tool holder mounting platform fixed on the machine frame, a sub-spindle mounting seat fixed in the middle of the machine frame, and a main spindle mounting seat fixed at one end of the machine frame, wherein the main spindle mounting seat and the sub-spindle mounting seat are arranged opposite to each other; The knife seat mounting platform is arranged along the length direction of the frame and is located at the side of the frame; the side of the knife seat mounting platform close to the outer wall of the frame is raised upward; A downwardly concave conical groove is provided in the middle of the frame, and the sub-spindle mounting seat is located in the conical groove; A sub-spindle slide rail mounting surface is fixed on the sub-spindle mounting seat, and a tool holder slide rail mounting surface is provided on the tool holder mounting platform; the length of the tool holder slide rail mounting surface is greater than the length of the sub-spindle slide rail mounting surface, and the length of the tool holder slide rail mounting surface is greater than half the length of the frame.

2. The bed structure of a compact CNC machine tool according to claim 1, characterized in that: The distance between the auxiliary spindle mounting seat and the main spindle mounting seat is greater than the distance between the end of the auxiliary spindle mounting seat away from the main spindle mounting seat and the side surface of the frame.

3. The bed structure of a compact CNC machine tool according to claim 2, characterized in that: An arc groove is provided at the bottom of the sub-spindle mounting seat.

4. The bed structure of a compact CNC machine tool according to claim 3, characterized in that: Reinforcement blocks are fixed on both sides of the secondary spindle mounting seat.

5. The bed structure of a compact CNC machine tool according to claim 4, characterized in that: An oblique groove is provided at the center of the tool holder mounting platform, and a plurality of reinforcing ribs are fixed in the oblique groove.

6. The bed structure of a compact CNC machine tool according to claim 5, characterized in that: A screw rod mounting block is further provided in the oblique groove of the tool holder mounting platform, and a screw rod mounting hole is provided on the screw rod mounting block. The screw rod mounting blocks are located on both sides of the reinforcing rib.

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