Lathe bed structure with auxiliary main shaft

Abstract

The invention relates to the technical field of metal processing machine tools, in particular to a lathe bed structure with an auxiliary spindle, which comprises a rack, a spindle component and an auxiliary spindle component, and the spindle component and the auxiliary spindle component are fixed on the rack and are oppositely arranged; the auxiliary main shaft assembly comprises an auxiliary main shaft installation base fixed to the rack, an auxiliary main shaft sliding base connected to the auxiliary main shaft installation base in a sliding mode, an auxiliary main shaft box body fixed to the auxiliary main shaft sliding base, an auxiliary main shaft clamping jaw and an auxiliary main shaft motor, wherein the auxiliary main shaft clamping jaw and the auxiliary main shaft motor are both fixed to the auxiliary main shaft box body. The auxiliary main shaft installation base is obliquely arranged relative to the horizontal plane of the rack. An auxiliary spindle lead screw is rotationally connected to the auxiliary spindle mounting seat, one end of the auxiliary spindle lead screw is connected with an axial motor, the bottom of the auxiliary spindle sliding seat is in threaded connection with the auxiliary spindle lead screw, and the axial motor is used for controlling the auxiliary spindle sliding seat to move on the auxiliary spindle mounting seat. The equipment has high positioning precision, improves the machining efficiency and reduces the machining cost through cooperation of the main shaft and the auxiliary shaft, and meanwhile can reduce vibration of a machine tool and guarantee 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 with a secondary spindle. Background Art

[0002] In the field of modern mechanical processing, the performance of machine tools plays a decisive role in processing quality and production efficiency. Among them, machine tools with sub-spindles are widely used in the processing of shaft parts due to their unique advantages.

[0003] The sub-spindle can usually move in the horizontal direction and can perform operations such as rotation clamping, so that the machine tool can realize the ability of simultaneous processing in two directions, which can shorten the production cycle and improve the processing efficiency. At present, there are many types of machine tools with sub-spindles on the market. For example, the prior art "machine tool with sub-spindle" (CN102430768A) fixes the sub-spindle box on the guide rail by means of a pressure plate and bolts. Although this structural design has a low cost, it still has the following technical problems: 1. Complex operation, limited positioning accuracy and repeat positioning accuracy: The clamp and bolt fixing method relies on manual tightening torque control, which is complex to operate and difficult to ensure the precise position of the sub-spindle housing each time it is installed, which is prone to positioning deviation. After long-term use, the bolts will loosen due to factors such as machine tool vibration and cutting force impact, causing the sub-spindle position to shift, affecting the processing accuracy, and the repeat positioning accuracy is difficult to maintain stably, which cannot meet the processing requirements of precision parts.

[0004] 2. Insufficient rigidity, easy vibration, poor processing stability: Bolt fixing mainly relies on the partial contact between the pressure plate and the guide rail to achieve tightening. The connection rigidity between the sub-spindle housing and the guide rail is weak. When subjected to large cutting force or centrifugal force generated by high-speed rotation, the sub-spindle is prone to vibration and deformation, reducing the quality of the processed surface and even causing damage to the tool. Especially when performing heavy cutting or high-speed milling, the problem of insufficient rigidity will be more prominent, resulting in increased dimensional errors of processed parts and worse surface roughness. Summary of the invention

[0005] The present invention provides a bed structure with a sub-spindle, which can solve the problems of complicated machining operation, poor positioning accuracy and easy vibration of machine tools with sub-spindles in the prior art, resulting in low machining accuracy.

[0006] The present application provides the following technical solution: a bed structure with a sub-spindle, comprising a frame, a spindle assembly fixed on the frame, and a sub-spindle assembly fixed on the frame, wherein the sub-spindle assembly is arranged opposite to the spindle assembly; The auxiliary spindle assembly includes an auxiliary spindle mounting base fixed on the machine frame, an auxiliary spindle slide seat slidably connected to the auxiliary spindle mounting base, an auxiliary spindle housing fixed on the auxiliary spindle slide seat, an auxiliary spindle jaw and an auxiliary spindle motor both fixed on the auxiliary spindle housing, and the auxiliary spindle motor is used to control the circumferential rotation of the auxiliary spindle jaw; an auxiliary spindle slide rail mounting surface is provided on the auxiliary spindle mounting base, and the auxiliary spindle slide rail mounting surface is inclined relative to the horizontal plane of the machine frame; An auxiliary spindle lead screw is rotatably connected to the auxiliary spindle mounting base, one end of the auxiliary spindle lead screw is connected with an axial motor, the bottom of the auxiliary spindle slide seat is threadedly connected to the auxiliary spindle lead screw, and the axial motor is used to control the movement of the auxiliary spindle slide seat on the auxiliary spindle mounting base.

[0007] Beneficial effects: 1. Improve the positioning accuracy, machining accuracy and machining efficiency. The auxiliary spindle slide seat is driven to slide by the auxiliary spindle lead screw and the axial motor, and the auxiliary spindle lead screw and the auxiliary spindle slide seat adopt a threaded transmission, so that the circumferential rotation of the auxiliary spindle lead screw is converted into the axial movement of the auxiliary spindle slide seat, realizing the function of driving the auxiliary spindle assembly to move. For each revolution of the auxiliary spindle lead screw, the auxiliary spindle slide seat will move a fixed distance, enabling the auxiliary spindle assembly to achieve precise linear displacement in the horizontal direction and having higher repeat positioning accuracy, effectively improving the machining accuracy during mass production in actual work. In addition, through the electric control driving mode of the axial motor, compared with the prior art that requires manually adjusting the position of the auxiliary spindle and positioning the auxiliary spindle housing, this solution has a high degree of automation, higher operation convenience, and can effectively ensure the machining efficiency.

[0008] 2. Enhance the rigidity of the machine tool, reduce vibration and ensure machining quality. Since the cutting load of the tool on the workpiece is transmitted to the auxiliary spindle mounting base, it is easy to cause vibration and reduce the machining accuracy. In this solution, the auxiliary spindle slide rail mounting surface is inclined relative to the horizontal plane of the machine frame. On the one hand, the gravity of the entire auxiliary spindle assembly is dispersed to the normal direction and the parallel direction of the upper surface of the auxiliary spindle mounting base, reducing the stress on the auxiliary spindle mounting base, enhancing the rigidity and reducing the vibration. On the other hand, when the upper surface of the auxiliary spindle mounting base is inclined, its overall volume is larger, with stronger bending and torsion resistance, better overall rigidity, further reducing the vibration during cutting and ensuring the machining quality.

[0009] 3. Save costs, improve efficiency and enhance machining capacity. Through the cooperation of the main spindle assembly and the auxiliary spindle assembly, not only can the same machine tool process two workpieces simultaneously, doubling the machining efficiency, but also it can respectively execute multi-step machining tasks, integrating multiple processes on the same machine tool, reducing the workpiece replacement operation between multiple processes, saving the workpiece replacement time and machining costs, and effectively enhancing the machining capacity of the machine tool.

[0010] Further, the main spindle assembly includes a main spindle mounting base fixed on the machine frame, a main spindle housing fixed on the main spindle mounting base, a main spindle motor and a main spindle jaw both fixed on the main spindle housing. The main spindle jaw is used to control the circumferential rotation of the main spindle jaw. The central axes of the main spindle jaw and the sub-main spindle jaw are located on the same straight line.

[0011] Beneficial effects: The central axes of the main spindle jaw and the sub-main spindle jaw are strictly collinear. During the multi-process machining, it is ensured that the workpiece does not need secondary centering when flowing between the main spindle jaw and the sub-main spindle jaw, which is beneficial to the clamping accuracy of the jaw on the workpiece during the workpiece replacement process, and further improves the machining accuracy. In addition, the coaxial design of the main spindle jaw and the sub-main spindle jaw makes the transfer path of the workpiece the shortest, realizes rapid clamping and unclamping, and greatly improves the machining beat and machining efficiency during long-term mass production.

[0012] Further, a tool holder mounting table is fixed on the machine frame. A tool holder slide rail mounting surface is provided on the tool holder mounting table, and the tool holder slide rail mounting surface is arranged parallel to the sub-main spindle slide rail mounting surface.

[0013] Beneficial effects: The tool holder slide rail mounting surface is arranged parallel to the sub-main spindle slide rail mounting surface, so that the cutting direction of the tool can cut from the obliquely upper part of the workpiece. Part of the cutting load of the tool can be offset by the gravity of the tool holder, which is not easy to cause cutting vibration and improves the machining accuracy. At the same time, since the tool is in an inclined state, during cutting, the chips are not easy to entangle with the tool due to gravity, which is beneficial to chip removal.

[0014] Further, the upper surface of the main spindle mounting base is an inclined surface, and the inclination angle of the inclined surface is arranged parallel to the sub-main spindle slide rail mounting surface.

[0015] Beneficial effects: The inclined surface of the main spindle mounting base is parallel to the sub-main spindle slide rail mounting surface, so that the loads of the main spindle assembly and the sub-main spindle assembly can act on the same cross-section of the machine frame as much as possible. During the cutting operation, the force on the machine frame is more stable, the vibration is reduced. Especially when machining eccentric workpieces, the difference in the load stress distribution on the machine frame is smaller, and the overall deformation of the machine frame is reduced, which is beneficial to improving the machining accuracy.

[0016] Further, a groove is provided at the center of the sub-main spindle mounting base. The sub-main spindle lead screw is located in the groove. An installation block is fixed at one end in the groove. One end of the sub-main spindle lead screw is rotatably connected in the installation block. The axial motor is fixed on the outer wall surface of the machine frame, and the sub-main spindle lead screw is located between the installation block and the axial motor.

[0017] Beneficial effects: The sub-main spindle lead screw is located in the groove of the sub-main spindle mounting base, which can protect the sub-main spindle lead screw and enhance the structural protection ability. At the same time, the groove makes the material of the sub-main spindle mounting base less, reduces the weight, and reduces the overall inertia of the machine frame. When the machine tool is cutting, the vibration is reduced and the machining accuracy is improved. Description of the Drawings

[0018] Figure 1 Is the isometric view of the present invention. Detailed implementation manners

[0019] The following is a further detailed description through specific implementation manners: The reference signs in the accompanying drawings of the specification include: frame 1, mounting block 2, sub-spindle mounting seat 3, positioning block 4, axial motor 5, sub-spindle lead screw 6, groove 7, sub-spindle slide rail 8, sub-spindle slide block 9, sub-spindle motor 10, sub-spindle housing 11, tool holder slide rail 12, sub-spindle jaw 13, main-spindle jaw 14, main-spindle housing 15, main-spindle motor 16, main-spindle mounting seat 17, tool holder mounting table 18.

[0020] Embodiment 1 As Figure 1 shown, a bed body structure with a sub-spindle includes a frame 1, a main-spindle assembly fixed on the frame 1, and a sub-spindle assembly fixed on the frame 1. The sub-spindle assembly is disposed opposite to the main-spindle assembly.

[0021] As Figure 1 shown, the main-spindle assembly includes a main-spindle mounting seat 17 fixed on one side of the frame 1, a main-spindle housing 15 fixed on the main-spindle mounting seat 17, a main-spindle motor 16 and a main-spindle jaw 14 both fixed on the main-spindle housing 15. The main-spindle jaw 14 is a three-jaw chuck, and the rotating shaft of the main-spindle motor 16 is fixedly connected to the main-spindle jaw 14, so that when the main-spindle motor 16 rotates, it can drive the main-spindle jaw 14 to rotate circumferentially.

[0022] As Figure 1As shown in the figure, the sub-spindle assembly includes a sub-spindle mounting base 3 fixed on the machine frame 1, a sub-spindle slide base 9 slidably connected to the sub-spindle mounting base 3, a sub-spindle housing 11 fixed on the sub-spindle slide base 9, a sub-spindle chuck 13 and a sub-spindle motor 10 both fixed on the sub-spindle housing 11. The sub-spindle chuck 13 is a three-jaw chuck, and the rotating shaft of the sub-spindle motor 10 is fixedly connected to the sub-spindle chuck 13, so that when the sub-spindle motor 10 rotates, it can drive the sub-spindle chuck 13 to rotate circumferentially, and the central axes of the main-spindle chuck 14 and the sub-spindle chuck 13 are located on the same straight line. The sub-spindle mounting base 3 is provided with a sub-spindle slide rail 8 mounting surface, and the sub-spindle slide rail 8 mounting surface is inclined relative to the horizontal plane of the machine frame 1, and the upper surface of the main-spindle mounting base 17 is an inclined surface, and the inclination angle of the inclined surface is parallel to the sub-spindle slide rail 8 mounting surface. The sub-spindle slide rail 8 is fixed on the sub-spindle slide rail 8 mounting surface, and the sub-spindle slide base 9 is slidably connected to the sub-spindle slide rail 8; a groove 7 is provided at the center of the sub-spindle mounting base 3, a sub-spindle lead screw 6 is provided in the groove 7, a mounting block 2 is fixed at one end in the groove 7, one end of the sub-spindle lead screw 6 is rotatably connected in the mounting block 2, the other end of the sub-spindle lead screw 6 is connected to an axial motor 5, the axial motor 5 is fixed on the outer wall surface of the machine frame 1, the sub-spindle lead screw 6 is located between the mounting block 2 and the axial motor 5, the bottom of the sub-spindle slide base 9 is threadedly connected to the sub-spindle lead screw 6, and when the axial motor 5 rotates, it can drive the sub-spindle lead screw 6 to rotate to control the movement of the sub-spindle slide base 9 on the sub-spindle slide rail 8.

[0023] As Figure 1 shown in the figure, a tool holder mounting table 18 for mounting tools is fixed on the machine frame 1. The tool holder mounting table 18 is provided with a tool holder slide rail mounting surface, and a tool holder slide rail 12 is fixed on the tool holder slide rail mounting surface, and the tool holder slide rail mounting surface is parallel to the sub-spindle slide rail mounting surface.

[0024] The usage method of this equipment is as follows: The workpiece to be processed can be clamped and fixed at the center of the chuck of the sub-spindle jaw 13. The sub-spindle motor 10 drives the sub-spindle jaw 13 to rotate, thereby driving the workpiece to rotate. Driven by the axial motor 5, the circumferential rotation of the sub-spindle lead screw 6 can be controlled, so as to drive the sub-spindle slide 9 to move along the sub-spindle slide rail 8 to the required coordinate position. For each revolution of the sub-spindle lead screw 6, the sub-spindle slide 9 will move a fixed distance, enabling the sub-spindle assembly to achieve precise linear displacement in the horizontal direction, with higher repeat positioning accuracy, effectively improving the machining accuracy during mass production in actual work. After the positioning of the sub-spindle slide 9 is completed, the workpiece blank is then cut by the tool on the tool holder mounting table 18. Since the inclined surfaces of the sub-spindle mounting table and the tool holder mounting table 18 are parallel, the cutting direction of the tool on the tool holder can cut from the obliquely upper side of the workpiece, and the cutting force is basically in the same direction as the gravity direction of the workpiece, making the rotation of the workpiece clamped by the sub-spindle jaw 13 relatively stable and not easily causing cutting vibration, providing machining accuracy. At the same time, since the tool is in an inclined state, during cutting, the iron filings are not easily wound around the tool due to gravity, which is conducive to chip removal. In addition, according to requirements, the main-spindle jaw 14 can also clamp the workpiece to realize the simultaneous machining of two workpieces on the same machine tool, doubling the machining efficiency. Different workpieces for different processes can also be clamped by the main-spindle jaw 14 and the sub-spindle jaw 13 respectively, integrating multiple processes on the same machine tool to complete multi-step machining tasks, reducing the workpiece replacement operation between multiple processes, saving workpiece replacement time and machining costs, and effectively improving the machining capacity of the machine tool.

[0025] The above are only embodiments of the present invention. The present invention is not limited to the fields involved in this embodiment. Common knowledge such as specific structures and characteristics known in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A bed body structure with a sub-spindle, characterized in that: It includes a frame, a main spindle assembly fixed to the frame, and a sub-main spindle assembly fixed to the frame. The sub-main spindle assembly is arranged opposite to the main spindle assembly; The sub-main spindle assembly includes a sub-main spindle mounting base fixed to the frame, a sub-main spindle slide seat slidably connected to the sub-main spindle mounting base, a sub-main spindle housing fixed to the sub-main spindle slide seat, a sub-main spindle jaw and a sub-main spindle motor both fixed to the sub-main spindle housing. The sub-main spindle motor is used to control the circumferential rotation of the sub-main spindle jaw; A sub-main spindle slide rail mounting surface is provided on the sub-main spindle mounting base, and the sub-main spindle slide rail mounting surface is inclined relative to the horizontal plane of the frame; A sub-main spindle lead screw is rotatably connected to the sub-main spindle mounting base. One end of the sub-main spindle lead screw is connected to an axial motor. The bottom of the sub-main spindle slide seat is threadedly connected to the sub-main spindle lead screw. The axial motor is used to control the movement of the sub-main spindle slide seat on the sub-main spindle mounting base.

2. The bed body structure with a sub-spindle according to claim 1, wherein: The main spindle assembly includes a main spindle mounting base fixed to the frame, a main spindle housing fixed to the main spindle mounting base, a main spindle motor and a main spindle jaw both fixed to the main spindle housing. The main spindle jaw is used to control the circumferential rotation of the main spindle jaw. The central axes of the main spindle jaw and the sub-main spindle jaw are located on the same straight line.

3. The bed structure with a sub-spindle according to claim 2, characterized in that: A tool holder mounting table is fixed to the frame. A tool holder slide rail mounting surface is provided on the tool holder mounting table, and the tool holder slide rail mounting surface is arranged parallel to the sub-main spindle slide rail mounting surface.

4. A bed body structure with a sub-spindle according to claim 3, characterized in that: The upper surface of the main spindle mounting base is an inclined surface, and the inclination angle of the inclined surface is arranged parallel to the sub-main spindle slide rail mounting surface.

5. The bed body structure with a sub-spindle according to claim 4, characterized in that: A groove is provided at the center of the sub-main spindle mounting base. The sub-main spindle lead screw is located in the groove. An installation block is fixed at one end in the groove. One end of the sub-main spindle lead screw is rotatably connected in the installation block. The axial motor is fixed on the outer wall surface of the frame. The sub-main spindle lead screw is located between the installation block and the axial motor.

Images