A machine tool spindle for installing a metal bellows

Abstract

The present application relates to a kind of lathe main shaft for installing metal bellows, belong to lathe processing equipment technical field, to solve when using ordinary lathe to install metal bellows, there is the problem of low installation efficiency caused by needing to replace multiple groups of tools, the low installation product yield of poor main shaft structure stability.This application includes shaft core, shaft body and rolling device;Main shaft is fixedly installed in the feed shaft of lathe by shaft body, and the position adjustment of main shaft relative to workpiece is carried out by feed shaft, and shaft body is provided with mounting through hole along the axial direction;Shaft core is rotatably installed in mounting through hole, and one end thereof is connected with lathe power device, and the other end is connected with rolling device;Rolling device is provided with roller;Roller is provided with several processing parts, and roller is slidingly installed in the end of shaft core;The sliding axis of roller and the shaft axis of shaft core are arranged at an angle.The lathe main shaft of the present application can complete the installation work of bellows at one time, without tool replacement, with high installation efficiency, low manufacturing cost, high bellows installation quality.

Description

Technical Field

[0001] This invention belongs to the technical field of machine tool processing equipment, and specifically relates to a machine tool spindle for installing metal corrugated pipes. Background Technology

[0002] A metal bellows is a type of pipe with a smooth inner surface and spiral protrusions on the outer surface. It is a new type of flexible sleeve made of alternating corrugated metal plates and various filler materials, possessing excellent sealing performance and shock resistance, and capable of accommodating large displacements. Utilizing these characteristics, existing technologies employ metal bellows to install on shaft-like workpieces to achieve sealing and shock absorption.

[0003] In the installation process of metal bellows, the existing method involves using a conventional machine tool to extrude the bellows, thus fixing it to the workpiece and achieving a good sealing effect. The machine tool spindle refers to the shaft on the machine tool that drives the workpiece or cutting tool to rotate. In the actual installation process, the bellows is first placed into the shaft-like workpiece, and then the bellows and workpiece are installed as a whole onto the machine tool. The extrusion rollers are installed on the machine tool spindle. Next, the workpiece and bellows rotate, and the machine tool's feed axis drives the rollers to feed, extruding the bellows onto the workpiece. Since the initial connection between the bellows and the workpiece mounting surface is vertical, after extrusion by the rollers, there will be raised vertical machining residue on the vertical edge. Therefore, post-extrusion finishing is required, necessitating the replacement of the finishing tool and rolling to flatten the vertical machining residue. The aforementioned bellows installation method suffers from low efficiency due to the need to change multiple sets of tools, including rollers and dressing tools. Furthermore, existing machine tools require manual tool mounting to the spindle, and the manual tightening of bolts during tool clamping provides insufficient fixing force. After extrusion, rolling and flattening are necessary, requiring frequent manual tightening, which can easily cause tool loosening and degrade bellows installation quality. While CNC machine tools can be used for automated production with multi-tool switching, this increases production costs. Therefore, there is an urgent need for a spindle specifically designed for bellows installation to address the low efficiency and poor spindle stability issues associated with installing metal bellows using conventional machine tools, which result in low product yields due to the need for multiple tool changes. Summary of the Invention

[0004] In view of the problems and deficiencies in the prior art, this application provides a machine tool spindle for installing metal bellows to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A machine tool spindle for installing a metal bellows includes a spindle core, a spindle body, and a rolling device. The spindle is fixedly mounted to the feed axis of the machine tool via the spindle body, and the position of the spindle relative to the workpiece is adjusted via the feed axis. The spindle body has an axially arranged through hole. The spindle core is rotatably mounted in the through hole, with one end connected to the machine tool power unit and the other end connected to the rolling device. The rolling device has rollers. The rollers have several processing sections and are slidably mounted on the end of the spindle core. The sliding axis of the rollers is set at an angle to the axis of the spindle core. The bellows is installed on the workpiece to form a workpiece assembly. The workpiece assembly is mounted on the machine tool, and the spindle feeds to the workpiece assembly via the feed axis. The different processing sections of the rollers roll, bend, and press the bellows to fix it to the workpiece.

[0007] Specifically, the two ends of the shaft core are rotatably mounted on the mounting through holes of the shaft body through the mounting bearings, and the end connected to the machine tool power unit is equipped with a drive wheel.

[0008] Specifically, the machine tool's power unit is equipped with a drive motor, and the power end of the drive motor is connected to the drive wheel of the shaft core via a drive belt.

[0009] Specifically, the end of the shaft core connected to the rolling device is provided with a cutting head; the end of the cutting head is provided with a mounting groove; and the roller is slidably mounted in the mounting groove.

[0010] Specifically, the groove direction of the mounting groove is perpendicular to the axis of the shaft core.

[0011] Specifically, the rolling device includes rollers and a power drive assembly; the power drive assembly is installed inside the blade head, and its power output end is connected to the rollers.

[0012] Specifically, the power drive assembly includes a power assembly and a drive assembly; the drive assembly is a rack and pinion drive structure, which includes a drive rack, drive teeth, and a driven rack; the shaft core has a through hole along the axial direction, the drive rack is slidably installed inside the cutter head, and one end of it has a gear part composed of continuous gears, and the other end extends along the through hole to the outside of the shaft core to form a connecting end, and is connected to the power end of the power assembly; the driven rack is slidably installed inside the cutter head, and one side of it has a gear part composed of continuous gears, and the other side is fixedly connected to a roller; the drive teeth are rotatably installed inside the cutter head, and they mesh with the gear parts of the drive rack and the driven rack respectively.

[0013] Specifically, the power assembly includes a servo press, a pressure sensor, and an adapter; the servo press is fixedly mounted on the feed shaft, and its power end is connected to the drive rack via the adapter; a pressure sensor is installed at the connection between the power end of the servo press and the adapter.

[0014] Specifically, the roller includes a roller body, a mounting frame, and a rolling roller; the mounting frame is fixedly connected to the driven rack, and two mounting rods are respectively provided at the end away from the driven rack; the roller body and the rolling roller are rotatably mounted on the two mounting rods respectively.

[0015] Specifically, the roller body has several annular protrusions spaced apart along the outer side of the roller body, and a machining cavity is formed between two adjacent annular protrusions; the axes of the roller body and the rolling roller are perpendicular to each other; several machining cavities are formed between the several annular protrusions, and the several machining cavities and the rolling roller constitute several machining parts.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] The machine tool spindle for installing metal bellows in this application features a spindle core rotatably mounted on the spindle body. A cutting head is located at the end of the spindle core, and rollers are slidably mounted on the cutting head. Each roller includes a roller body and a rolling roller. The outer side of the roller body has several annular protrusions spaced apart, forming several machining cavities, which, together with the rolling roller, constitute several machining sections. This allows the bellows to be extruded, bent, and compressed using different machining sections via the feed axis of the machine tool mounted on the rollers, enabling the bellows installation to be completed in one operation without tool changes, thus improving installation efficiency.

[0018] Building upon the foregoing, considering the need for a power drive assembly for the roller's movement, and in order to reduce component installation space while ensuring the spindle's core rotates, the core is designed with an axially extending through-hole serving as the mounting cavity for the power drive assembly that drives the roller's movement. The power drive assembly is designed as a gear and rack structure, which facilitates space saving, achieves a compact spindle structure, and improves spindle operational stability.

[0019] Based on the above, by setting up a servo press and an adapter, the servo press provides power to the drive rack, enabling the drive rack to move linearly along the shaft core through hole. The adapter allows the drive rack to rotate with the shaft core. At the same time, a pressure sensor is set up to detect the power output of the servo press to the drive rack in real time, so that the drive rack drives the driven rack to move linearly along the mounting groove, improving the stability of the roller movement and ensuring the installation yield of the bellows. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the machine tool spindle for mounting the metal bellows in this embodiment.

[0021] Figure 2 This is a schematic diagram of the machine tool spindle used for mounting the metal bellows in this embodiment (the drive motor and drive belt are not shown).

[0022] Figure 3 for Figure 2 Sectional view of AA;

[0023] Figure 4 This is a schematic diagram of the bellows extrusion process performed on the machine tool spindle used for installing the metal bellows in this embodiment.

[0024] Figure 5 This is a schematic diagram of the bellows bending process performed by the machine tool spindle used for installing the metal bellows in this embodiment.

[0025] Figure 6 This is a schematic diagram of the bellows clamping process performed by the machine tool spindle used for installing the metal bellows in this embodiment.

[0026] In the diagram: 1. Servo press; 2. Pressure sensor; 3. Adapter; 4. Drive rack; 5. Drive belt; 6. Drive motor; 7. Shaft; 8. Shaft core; 9. Extrusion head; 10. Roller body; 11. Main spindle; 12. Feed shaft; 13. Drive gear; 14. Driven rack; 15. Mounting bracket; 16. Roller roller; 17. Extrusion processing section; 18. Pressing processing section; 19. Worktable; 20. Column; 21. Bellows; 22. Workpiece. Detailed Implementation

[0027] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0028] Please see Figures 1-6 This embodiment provides a machine tool spindle 11 for installing a metal bellows, including a spindle core 8, a spindle body 7, and a rolling device. The spindle 11 is fixedly installed on the feed axis 12 of the machine tool via the spindle body 7, and the position of the spindle relative to the workpiece is adjusted by the feed axis. The spindle body is provided with a mounting through hole along the axial direction. The spindle core 8 is rotatably installed in the mounting through hole, and one end of it is connected to the machine tool power device, and the other end is connected to the rolling device. The rolling device is provided with rollers. The rollers are provided with a plurality of processing parts, and the rollers are slidably installed at the end of the spindle core. The sliding axis of the rollers is set at an angle to the axis of the spindle core. The bellows 21 is installed on the workpiece 22 to form a workpiece assembly. The workpiece assembly is installed on the machine tool, and the spindle feeds to the workpiece assembly via the feed axis. The bellows is rolled, bent, and pressed by the different processing parts of the rollers to fix the bellows to the workpiece.

[0029] Furthermore, the two ends of the shaft core 8 are rotatably mounted in the mounting through holes of the shaft body 7 via mounting bearings, and the end connected to the machine tool power unit is provided with a drive wheel.

[0030] Furthermore, the machine tool's power unit is equipped with a drive motor 6, and the power end of the drive motor 6 is connected to the drive wheel of the shaft core via a drive belt 5.

[0031] Furthermore, the end of the shaft core 7 connected to the rolling device is provided with a cutting head 9; the end of the cutting head 9 is provided with a mounting groove; the roller is slidably mounted in the mounting groove.

[0032] Furthermore, the groove direction of the mounting groove is perpendicular to the axis of the shaft core.

[0033] Furthermore, the rolling device includes rollers and a power drive assembly; the power drive assembly is installed inside the blade head, and its power output end is connected to the rollers.

[0034] Furthermore, the power drive assembly includes a power assembly and a drive assembly; the drive assembly is a gear and rack drive structure, which includes a drive rack 4, a drive tooth 13, and a driven rack 14; the shaft core 7 has a through hole along the axial direction, the drive rack 4 is slidably installed inside the cutter head, and one end of it has a gear part composed of continuous gears, and the other end extends along the through hole to the outside of the shaft core to form a connecting end, and is connected to the power end of the power assembly; the driven rack 14 is slidably installed inside the cutter head, and one side of it has a gear part composed of continuous gears, and the other side is fixedly connected to a roller; the drive tooth 13 is rotatably installed inside the cutter head, and it meshes with the gear parts of the drive rack and the driven rack respectively.

[0035] Furthermore, the power assembly includes a servo press 1, a pressure sensor 2, and an adapter 3; the servo press 1 is fixedly mounted on the feed shaft 12, and its power end is connected to the connection end of the drive rack 4 through the adapter 3; the pressure sensor 2 is installed at the connection point between the power end of the servo press 1 and the adapter 3.

[0036] Furthermore, the roller includes a roller body 10, a mounting bracket 15, and a rolling roller 16; the mounting bracket 15 is fixedly connected to the driven rack 14, and two mounting rods are respectively provided at the end away from the driven rack; the roller body 10 and the rolling roller 16 are rotatably mounted on the two mounting rods respectively.

[0037] Furthermore, the roller body has several annular protrusions spaced apart along its outer side, and a processing cavity is formed between two adjacent annular protrusions; the axes of the roller body and the rolling roller are perpendicular to each other; several processing cavities are formed between the several annular protrusions, and the several processing cavities and the rolling roller constitute several processing parts. The installation of the bellows in this embodiment requires extrusion, bending and pressing processes. The rolling roller can be bent, and three annular protrusions are provided on the outer side of the roller body to form an extrusion processing part 17 and a pressing processing part 18.

[0038] Working Principle: 1. In this embodiment, the machine tool is equipped with a spindle box, a worktable 19, and a column 20. The column is fixedly installed on the rear side of the top of the machine tool base. A Z-axis feed module is fixedly installed on the front side of the column. One end of the Z-axis feed module is connected to the spindle box through a connecting plate, and the other end is equipped with a feed axis, which has a mounting base. In this embodiment, the spindle drive motor and servo press are fixedly installed on the mounting base, and the spindle shaft is installed on the side of the mounting base. The lower end of the spindle is equipped with a worktable. The workpiece and the metal bellows are mounted on the worktable through the hydraulic clamping module of the worktable. The feed axis is driven by the spindle box and moves along the Z-axis, driving the mounting base to feed towards the workpiece on the worktable.

[0039] 2. During operation, the workpiece assembly, consisting of the workpiece and the bellows, is placed onto the worktable by a robotic arm and fixed by a hydraulic clamping module. The machine tool's height measurement module measures the height of the workpiece and then controls the Z-axis feed module to adjust the working height. Specifically, the feed axis drives the mounting base to feed towards the workpiece along the Z-axis to the machining point. Then, the drive motor starts, driving the shaft and the cutting head to rotate via a drive belt, which in turn drives the rollers to rotate. Simultaneously, the servo press starts, its power end presses down, pushing the drive rack downwards. The drive rack drives the driven rack, causing the rollers to extend towards the workpiece along the mounting groove. It is important to note that during the extension process, the vertical edge of the bellows is pressed against the workpiece by the extrusion processing section, while the rolling roller is suspended and does not process the workpiece. After the extrusion process is completed, the vertical edge of the bellows is pressed onto the circumference of the workpiece (see reference). Figure 4 Vertical edges will have leftover material from vertical processing.

[0040] 3. After the extrusion process is completed, due to the remaining vertical processing residue, the extension position of the roller body needs to be adjusted, and the spindle height needs to be adjusted simultaneously to feed the roller to the processing point. Then, the drive shaft rotates, simultaneously driving the roller to retract inward, causing the roller to flatten and trim the vertical processing residue of the bellows (refer to...). Figure 5 The vertical processing waste is bent under the rolling of the rollers until it becomes flat.

[0041] 4. After completing the bending and flattening process of the vertical processing residue, the installation state between the bellows and the workpiece is not flat at this time, and the connection force between the bellows and the workpiece is insufficient. In order to improve the installation stability of the bellows, the spindle height is adjusted again to feed the roller body to the processing point, and then the spindle core is driven to rotate, while the roller body is driven to extend outward. The clamping processing part presses the bellows, which has been squeezed to the wall of the workpiece, firmly. (Reference) Figure 6 Finally, the spindle is reset, and the machined bellows and workpiece are removed by the robot arm.

[0042] The embodiments of the present invention have been described in detail above with reference to the examples. However, the present invention is not limited to the above embodiments. For those skilled in the art, after learning the contents described in the present invention, several equivalent changes and substitutions can be made without departing from the principle of the present invention. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A machine tool spindle for mounting metal bellows, comprising a spindle core, a spindle body, and a rolling device; the spindle is fixedly mounted to the feed axis of the machine tool via the spindle body, and the position of the spindle relative to the workpiece is adjusted via the feed axis, characterized in that: The shaft body is provided with an axial through hole; the shaft core is rotatably mounted in the through hole, with one end connected to the machine tool power unit and the other end connected to the rolling device; the rolling device is provided with rollers; the rollers are provided with several processing parts, and the rollers are slidably mounted on the end of the shaft core; the sliding axis of the rollers is set at an angle to the axis of the shaft core; the bellows is installed on the workpiece to form a workpiece assembly; the workpiece assembly is installed on the machine tool, and the spindle feeds to the workpiece assembly through the feed axis, and the bellows is rolled, bent and pressed by the different processing parts of the rollers to fix the bellows to the workpiece; The end of the shaft core connected to the rolling device is provided with a cutting head; the end of the cutting head is provided with a mounting groove; the roller is slidably mounted in the mounting groove; The groove direction of the mounting slide is perpendicular to the axis of the shaft core; The rolling device includes rollers and a power drive assembly; the power drive assembly is installed inside the blade head, and its power output end is connected to the rollers; The power drive assembly includes a power assembly and a drive assembly; the drive assembly is a rack and pinion drive structure, which includes a drive rack, drive teeth, and a driven rack; the shaft core has a through hole along the axial direction, the drive rack is slidably installed inside the cutter head, and one end of the drive rack has a gear section composed of continuous gears, and the other end extends along the through hole to the outside of the shaft core to form a connecting end, and is connected to the power end of the power assembly; the driven rack is slidably installed inside the cutter head, and one side of the driven rack has a gear section composed of continuous gears, and the other side is fixedly connected to the roller; the drive teeth are rotatably installed inside the cutter head, and they mesh with the gear sections of the drive rack and the driven rack respectively; The roller includes a roller body, a mounting frame, and a rolling roller; the mounting frame is fixedly connected to the driven rack, and two mounting rods are respectively provided at the end away from the driven rack; the roller body and the rolling roller are rotatably mounted on the two mounting rods respectively. The roller body has several annular protrusions spaced apart along the outer side of the roller body, and a processing cavity is formed between two adjacent annular protrusions; the axes of the roller body and the rolling roller are perpendicular to each other; several processing cavities are formed between the several annular protrusions, and the several processing cavities and the rolling roller constitute the several processing parts.

2. A machine tool spindle for mounting metal bellows according to claim 1, characterized in that: Both ends of the shaft core are rotatably mounted on the mounting through holes of the shaft body via mounting bearings, and the end connected to the machine tool power unit is provided with a drive wheel.

3. A machine tool spindle for mounting metal bellows according to claim 2, characterized in that: The machine tool's power unit is equipped with a drive motor, and the power end of the drive motor is connected to the drive wheel of the shaft core via a drive belt.

4. A machine tool spindle for mounting metal bellows according to claim 1, characterized in that: The power assembly includes a servo press, a pressure sensor, and an adapter; the servo press is fixedly mounted on the feed shaft, and its power end is connected to the connection end of the drive rack via the adapter; the pressure sensor is installed at the connection between the power end of the servo press and the adapter.

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