Machine tool with special chair leg clamp assembly and operation method for machining chair legs

Abstract

The invention relates to a machine tool and a machine tool operation method, in particular to a machine tool with a special chair leg clamp assembly and an operation method for machining chair legs, and aims to solve the problems that a traditional single-station machine tool clamp can only clamp one workpiece for machining each time, clamping, positioning and clamping occupy a large amount of time, the production takt is long, and the machining efficiency is high. The automatic tool changing machine comprises a machine tool body, a chain type tool magazine, a stand column, a tool changing mechanical arm, a Z-axis rotating part, a woodworking electric main shaft, an axle and a clamp assembly. The method comprises the steps that firstly, three wooden chair leg blanks are installed on three stations; step 2, turning the front ends of the three wooden chair leg blanks by using a turning tool; thirdly, a milling cutter is called to mill the rear ends of the three wooden chair leg blanks; and fourthly, a nicking tool is called to conduct carving machining on the three wooden chair leg blanks. The invention is applied to the field of woodworking compound machine tools.

Description

TECHNICAL FIELD

[0001] The present application relates to a machine tool and a machine tool operation method, in particular to a machine tool with a special chair leg clamp assembly and a chair leg machining operation method, and applies to the field of woodworking composite machine tools. BACKGROUND

[0002] In recent years, with the rising demand for solid wood furniture market, as a typical solid wood processing parts of special-shaped chair legs, due to the lack of special processing machine tool, production efficiency is limited. For the machining of solid wood special-shaped chair legs, sometimes turning, milling and carving and other processes are needed, the traditional single-station machine tool clamp, because each time only one workpiece can be clamped for machining, clamping, positioning, clamping auxiliary operation occupies a lot of time, resulting in long production rhythm, it is difficult to meet the demand of mass production. And each time the tool change will consume a certain amount of time, resulting in the overall chair leg processing efficiency is reduced. SUMMARY

[0003] The purpose of the present application is to solve the problem that the traditional single-station machine tool clamp can only clamp one workpiece for machining each time, and clamping, positioning and clamping occupy a lot of time, resulting in long production rhythm, and each time the tool change consumes a certain amount of time, resulting in the overall chair leg processing efficiency is reduced, and further provides a machine tool with a special chair leg clamp assembly and a chair leg machining operation method.

[0004] The technical scheme for solving the above problems of the present application is:

[0005] A machine tool with a special chair leg clamp assembly, comprising a bed body, a chain tool magazine, a column, a tool changing robot, a Z-axis rotation, a woodworking electric spindle, an axle and a clamp assembly;

[0006] The chain tool magazine is slidably arranged above the bed body by a slide rail, the column is slidably arranged above the bed body by a slide rail near the chain tool magazine, the tool changing robot and the Z-axis rotation are installed on the two side faces of the column, the woodworking electric spindle is installed on the Z-axis rotation, the woodworking electric spindle is driven to move in the vertical direction by the Z-axis rotation, a motor is installed on the bed body, the motor drives the axle to rotate through a synchronous belt, the clamp assembly is installed on the bed body near the woodworking electric spindle, and the axle output end is installed on the clamp assembly and controls the clamp assembly to clamp the chair leg.

[0007] Further, the clamp assembly comprises a rotary clamp, a clamp center and a sliding center support;

[0008] The clamp center is slidably arranged on the bed body by the sliding center support, the rotary clamp is arranged opposite to the clamp center and fixedly installed on the bed body, and the axle output end is installed on the rotary clamp and controls the rotary clamp to clamp and release the chair leg.

[0009] Further, the rotary clamp comprises a housing, a planet carrier, a sun gear, a flange shaft, three planet front shafts, three planet gears, three chucks and three jaws.

[0010] The housing is mounted on the bed body, the planet carrier is mounted in the housing, the flange shaft passes through the planet carrier and is rotationally connected with the housing, the axle is rotationally connected and mounted on the housing and connected with the sun gear, the sun gear is sleeved on the flange shaft to realize synchronous rotation, each planet front shaft is sleeved with a planet gear, the three planet gears are radially arranged outside the sun gear and are respectively meshed with the sun gear, one end of each planet front shaft is rotationally connected and mounted on the planet carrier, and the other end of each planet front shaft is connected with the chuck.

[0011] Further, the rotary clamp further comprises a flange shaft deep groove ball bearing and three front shaft deep groove ball bearings; the flange shaft is rotationally connected with the housing through the flange shaft deep groove ball bearing, and each planet front shaft is rotationally connected with the planet carrier through the front shaft deep groove ball bearing.

[0012] Further, the rotary clamp further comprises a planet carrier electromagnetic clutch, a rear shaft electromagnetic clutch and three planet rear shafts.

[0013] The planet carrier is connected with the housing through the planet carrier electromagnetic clutch, and the rotation and stop of the housing are controlled by the planet carrier electromagnetic clutch, each planet front shaft is connected with the planet rear shaft through the rear shaft electromagnetic clutch, and each chuck is mounted on the planet rear shaft, and the rotation and stop of the planet rear shaft are controlled by the rear shaft electromagnetic clutch.

[0014] Further, the housing comprises a rotary clamp rear shell, a rotary workbench and a rotary clamp front shell.

[0015] The rotary clamp rear shell is mounted on one end of the rotary clamp front shell, the rotary workbench is mounted on the other end of the rotary clamp front shell, the flange shaft is inserted into the rotary clamp rear shell, the flange shaft is fixedly connected with the axle through bolts, the other end of the flange shaft is rotationally connected with the rotary workbench through the flange shaft deep groove ball bearing, the three chucks are mounted on the rotary workbench, and the planet carrier electromagnetic clutch is arranged between the planet carrier and the rotary clamp rear shell.

[0016] Further, the clamp center comprises a pneumatic tailstock, a pneumatic center support, a disc workbench, three centers and three cylinders; the three cylinders are arranged and mounted on the disc workbench in a radial direction through the three pneumatic tailstocks, each center is mounted on the extension end of the piston rod of a cylinder, the piston rod of the cylinder drives the center to move in the axial direction of the cylinder, and the three pneumatic tailstocks and the three cylinders rotate in the pneumatic center support.

[0017] Further, the pneumatic center support is a cylinder with one end sealed, and the center of the cylinder is provided with a sleeve, the disc workbench is a circular plate, and the center of the circular plate is fixed with a rod, the rod of the circular plate is inserted into the sleeve of the cylinder, and the circular plate is arranged at the open end of the cylinder.

[0018] Further, the clamp center also includes a first bearing and a second bearing.

[0019] The first bearing and the second bearing are respectively installed at two ends of the sleeve, and the rod of the circular plate and the sleeve of the cylinder are rotationally connected through the first bearing and the second bearing.

[0020] A machine tool machining chair leg operation method with a special chair leg clamp assembly, the method is realized according to the following steps:

[0021] Step one: three workstations are arranged on the clamp assembly, and three wooden chair leg blank parts are installed on the three workstations.

[0022] Step two: the tool is called from the chain tool magazine through the tool changing manipulator, and the turning tool is called to turn the front end of the three wooden chair leg blank parts:

[0023] When turning, the alpha surface of one wooden chair leg blank part is turned, the flange shaft is driven to rotate through the rotation of the shaft, the center gear is driven to rotate, and the three planetary gears are driven to rotate, at this time the planetary carrier electromagnetic clutch circuit is powered on, the planetary carrier and the planetary carrier electromagnetic clutch are disconnected, the rear shaft electromagnetic clutch is powered on, the planetary front shaft and the planetary rear shaft are disconnected, the three workstations are rotated around the center gear by 120 degrees, and then the alpha surfaces of the second wooden chair leg blank part and the third wooden chair leg blank part are turned.

[0024] Step three: the tool is called from the chain tool magazine through the tool changing manipulator, and the milling cutter is called to mill the rear end of the three wooden chair leg blank parts:

[0025] The rotation of the axle drives the rotation of the flange shaft, the rotation of the flange shaft drives the rotation of the central gear, the rotation of the central gear drives the rotation of the three planetary gears around the fixed shaft of the planet carrier, at this time, the planet carrier electromagnetic clutch circuit is powered off, the planet carrier is fixedly connected with the rear shell of the rotary clamp, the fixed shaft of the milling machining station is rotated, and the beta surface of the wooden chair leg blank is milled; the rear axle electromagnetic clutch circuits of the other two stations are powered on, the planet front axle and the planet rear axle are disconnected, after the milling is completed, the axle is rotated to drive the rotation of the flange shaft, the rotation of the flange shaft drives the rotation of the central gear, the rotation of the central gear drives the rotation of the three planetary gears around the fixed shaft of the planet carrier, the planet carrier electromagnetic clutch circuit is powered on, the planet carrier and the planet carrier electromagnetic clutch are disconnected, the rear axle electromagnetic clutch circuit is powered on, the planet front axle and the planet rear axle are disconnected through the rear axle electromagnetic clutch, and the three stations are rotated by 120 degrees around the central gear in sequence, then the beta surfaces of the other two wooden chair leg blanks are milled, and the discharging is completed through the mechanical hand.

[0026] Step four: the tool is called from the chain tool magazine through the tool changing mechanical hand, and the carving is performed on the three wooden chair leg blanks through the carving tool.

[0027] The rotation of the axle drives the rotation of the flange shaft, the rotation of the flange shaft drives the rotation of the central gear, the rotation of the central gear drives the rotation of the three planetary gears around the fixed shaft of the planet carrier, the planet carrier electromagnetic clutch circuit is powered off, the planet carrier is fixedly connected with the rear shell of the rotary clamp, the fixed shaft of the milling machining station is rotated, and the beta surface of the wooden chair leg blank is milled; the rear axle electromagnetic clutch circuits of the other two stations are powered on, the planet front axle and the planet rear axle are disconnected, after the milling is completed, the axle is rotated to drive the rotation of the flange shaft, the rotation of the flange shaft drives the rotation of the central gear, the rotation of the central gear drives the rotation of the three planetary gears around the fixed shaft of the planet carrier, the planet carrier electromagnetic clutch circuit is powered on, the planet carrier and the planet carrier electromagnetic clutch are disconnected, the rear axle electromagnetic clutch circuit is powered on, the planet front axle and the planet rear axle are disconnected through the rear axle electromagnetic clutch, and the three stations are rotated by 120 degrees around the central gear in sequence, then the beta surfaces of the other two wooden chair leg blanks are milled, and the discharging is completed through the mechanical hand.

[0028] Compared with the prior art, the present application has the following technical effects:

[0029] 1. The application realizes the quick switching of three stations through the clamp assembly, each station can be designed according to different machining processes to meet the multi-process machining requirements, effectively reducing the workpiece transfer time and clamping times, and improving the machining efficiency. For the chair leg that only needs one knife, three chair legs can be machined at the same time; for the chair leg that needs turning, milling, engraving and other multi-processes, through the function division of the feeding, machining and discharging stations, the machining process continuity is realized, one knife can machine three stations at the same time, and the knife changing time is reduced during traditional clamping. When using the last knife, the feeding, machining and discharging stations are processed in sequence, three stations are discharged, machined and fed in sequence, and the chair leg is efficiently machined. The application realizes the planetary rotation of three stations through a driving member, and the electromagnetic clutch is used to realize the simplification of the structure. The power interruption is controlled by the electromagnetic clutch, and the electromagnetic clutch is used on the machine tool.

[0030] 2. The machine tool with a special chair leg clamp assembly disclosed in the application has a plurality of functional clamps, the flange shaft 810 is connected with the axle 7, the rotation of the three-station chuck 815 can be driven through the row center gear 808 and the three planetary gears 807, and the feeding and discharging stations are completed in sequence. For the chair leg, sometimes self-rotation is needed to complete the machining, the planetary carrier 803 of the rotary clamp 8 is controlled to rotate and stop by the planetary carrier electromagnetic clutch 802, each rear shaft electromagnetic clutch 813 controls the rotation and stop of the planetary rear shaft 814, and the rotation control of the planetary carrier 803 and the rotation control of each planetary rear shaft 814 are realized.

[0031] 3. The machine tool of the application is connected with the axle 7 through the flange shaft 810, a power source is provided for the flange shaft 810, and the station can satisfy the planetary rotation, and the power source is less.

[0032] 4. The application controls the planetary carrier 803 through the planetary carrier electromagnetic clutch 802 to have the fixing effect, realizes the fixed shaft rotation of the station, and controls the power on-off of the chuck 815 on the planetary rear shaft 814 and the planetary front shaft 805 through the rear shaft electromagnetic clutch 813 to realize the rotation of the specific station. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic view of one side angle of the application;

[0034] Figure 2 is a structural schematic view of the other side angle of the application;

[0035] Figure 3 is a schematic view of A, B and C three parts installed on the clamp assembly;

[0036] Figure 4is a schematic view of the rotary clamp 8 in cross section;

[0037] Figure 5 is a schematic view of the structure of the rotary clamp 8;

[0038] Figure 6 is a schematic view of the clamp center 9.

[0039] Figure 7 is a schematic view of a wooden chair leg. DETAILED DESCRIPTION

[0040] In combination Figure 1 and Figure 2 This embodiment is described, a machine tool with a special chair leg clamp assembly, which includes a bed body 1, a chain tool magazine 2, a column 3, a tool changing robot 4, a Z-axis rotation 5, a woodworking electric spindle 6, an axle 7 and a clamp assembly;

[0041] The chain tool magazine 2 is slidably arranged above the bed body 1, the column 3 is slidably arranged above the bed body 1 near the chain tool magazine 2, the tool changing robot 4 and the Z-axis rotation 5 are installed on the two side faces of the column 3, the woodworking electric spindle 6 is installed on the Z-axis rotation 5, the woodworking electric spindle 6 is driven by the Z-axis rotation 5 to move in the vertical direction, a motor is installed on the bed body 1, the motor drives the axle 7 to rotate through a synchronous belt, and the clamp assembly is installed on the bed body 1 near the woodworking electric spindle 6, the output end of the axle 7 is installed on the clamp assembly and controls the clamp assembly to clamp the chair leg.

[0042] In this embodiment, the belt pulley drives the rotation of the axle 7, the axle 7 is connected with the clamp assembly, and three solid wood special-shaped chair legs are installed on the clamp assembly, and the three solid wood special-shaped chair legs are clamped by the output power of the axle 7.

[0043] As shown in Figure 3 , the clamp assembly includes a rotary clamp 8, a clamp center 9 and a sliding center support 10;

[0044] The clamp center 9 is slidably arranged on the bed body 1 through the sliding center support 10, the rotary clamp 8 is arranged relative to the clamp center 9 and fixedly installed on the bed body 1, and the output end of the axle 7 is installed on the rotary clamp 8 and controls the rotary clamp 8 to clamp and release the chair leg.

[0045] The chair leg is arranged between the rotary clamp 8 and the clamp center 9, the sliding center support 10 is arranged above the bed body 1, the sliding center support 10 moves on the bed body, and the clamp center 9 is located above the sliding center support 10 and fixedly connected with the sliding center support 10.

[0046] As shown in Figure 1 , Figure 4 and Figure 5As shown, the rotary clamp 8 comprises a housing, a planet carrier 803, a central gear 808, a flange shaft 810, three planet front shafts 805, three planet gears 807, three chucks 815 and three clamping jaws 816;

[0047] The housing is mounted on the bed body 1, the planet carrier 803 is mounted in the housing, the flange shaft 810 passes through the planet carrier 803 and is rotationally connected with the housing, the axle 7 is rotationally connected and mounted on the housing and connected with the central gear 808, the central gear 808 is sleeved on the flange shaft 810 to realize synchronous rotation, one planet gear 807 is sleeved on each planet front shaft 805, the three planet gears 807 are radially arranged outside the central gear 808 and respectively meshed with the central gear 808, one end of each planet front shaft 805 is rotationally connected and mounted on the planet carrier 803, and the other end of each planet front shaft 805 is connected with the chuck 815, and four clamping jaws 816 are mounted on each chuck 815.

[0048] The flange shaft 810 is rotated to drive the central gear 808 to rotate, the central gear 808 is rotated to drive the three planet gears 807 to rotate, the planet gears 807 are rotated to drive the corresponding planet front shafts 805 to rotate, the planet front shafts 805 are rotated to drive the chucks 815 and the clamping jaws 816 on the chucks 815 to rotate, and the clamping jaws are controlled to extend and retract in a pneumatic mode.

[0049] As shown in Figure 4 and Figure 5 , the rotary clamp 8 further comprises a flange shaft deep groove ball bearing 811 and three front shaft deep groove ball bearings 804; the flange shaft 810 is rotationally connected with the housing through the flange shaft deep groove ball bearing 811, and each planet front shaft 805 is rotationally connected with the planet carrier 803 through the front shaft deep groove ball bearing 804.

[0050] As shown in Figure 4 and Figure 5 , the rotary clamp 8 further comprises a central shaft electromagnetic clutch 802, a rear shaft electromagnetic clutch 813 and three planet rear shafts 814;

[0051] The planet carrier 803 is connected with the housing through the planet carrier electromagnetic clutch 802, the rotation and stop of the planet carrier 803 are controlled by the planet carrier electromagnetic clutch 802, each planet front shaft 805 is connected with the planet rear shaft 814 through the rear shaft electromagnetic clutch 813, and each chuck 815 is mounted on the planet rear shaft 814, the rotation and stop of the planet rear shaft 814 are controlled by the rear shaft electromagnetic clutch 813.

[0052] As shown in Figure 4 and Figure 5 , the rotary clamp 8 further comprises a planet carrier electromagnetic clutch 802, a rear shaft electromagnetic clutch 813 and three planet rear shafts 814;

[0053] The planet carrier 803 is connected with the shell through the planet carrier electromagnetic clutch 802, the rotation and stop of the shell are controlled by the planet carrier electromagnetic clutch 802, each planet front shaft 805 is connected with the planet rear shaft 814 through the rear shaft electromagnetic clutch 813, each chuck 815 is installed on the planet rear shaft 814, the rotation and stop of the planet rear shaft 814 are controlled by the rear shaft electromagnetic clutch 813.

[0054] The planet carrier 803 is connected with the shell through the planet carrier electromagnetic clutch 802, the rotation and stop of the planet carrier 803 are controlled by the planet carrier electromagnetic clutch 802, the chuck 815 is connected with the planet front shaft 805 through the rear shaft electromagnetic clutch 813, whether the chuck 815 rotates is controlled by the rear shaft electromagnetic clutch 813.

[0055] As shown in Figure 4 and Figure 5 , the shell comprises a rotary clamp rear shell 801, a rotary workbench 812 and a rotary clamp front shell 817;

[0056] The rotary clamp rear shell 801 is installed on one end of the rotary clamp front shell 817, the rotary workbench 812 is installed on the other end of the rotary clamp front shell 817, the flange shaft 810 is inserted on the rotary clamp rear shell 801, the flange shaft 810 is fixedly connected with the axle 7 through bolts, the other end of the flange shaft 810 is rotationally connected with the rotary workbench 812 through the flange shaft deep groove ball bearing 811, three chucks 815 are installed on the rotary workbench 812, and the planet carrier electromagnetic clutch 802 is arranged between the planet carrier 803 and the rotary clamp rear shell 801.

[0057] The flange shaft 810 is connected with the center gear 808 through the first key 809 in a key connection mode, so that the flange shaft 810 and the center gear 808 rotate synchronously, and each planet front shaft 805 is connected with the planet gear 807 through a second key 806 in a key connection mode, so that each planet front shaft 805 and the planet gear 807 rotate synchronously.

[0058] As shown in Figure 3 and Figure 6 , the clamp center 9 comprises a pneumatic tailstock 902, a pneumatic center support 904, a disc workbench 906, three centers 901 and three cylinders 903; the three cylinders 903 are installed on the disc workbench 906 through the three pneumatic tailstocks 902 and are evenly distributed in the radial direction, each center 901 is installed on the extension end of the piston rod of each cylinder 903, the piston rod of the cylinder 903 drives the center 901 to move in the axial direction of the cylinder, and the three pneumatic tailstocks 902 and the three cylinders 903 rotate in the pneumatic center support 904.

[0059] As shown in Figure 3 and Figure 6As shown, the pneumatic center support 904 is a sealed cylinder with a sleeve in the center, and the disc table 906 is a circular plate with a rod fixed in the center, the rod of the circular plate is inserted into the sleeve of the cylinder, and the circular plate is arranged at the open end of the cylinder.

[0060] As shown in Figure 3 and Figure 6 The fixture center 9 also includes a first bearing 905 and a second bearing 907.

[0061] The first bearing 905 and the second bearing 907 are respectively installed at both ends of the sleeve, and the rod of the circular plate and the sleeve of the cylinder are rotatably connected through the first bearing 905 and the second bearing 907.

[0062] In combination Figures 1-7 The second embodiment is a machine tool operation method with a special chair leg clamp assembly, which is realized according to the following steps:

[0063] Processing the wooden chair leg as shown in Figure 7 The wooden chair leg is divided into a front end and a rear end by turning and milling processing, the front end α surface area is turned, and the rear end β surface area with curvature is milled, and the turning and milling have no sequence; after the rear end β surface is milled, a surface area needs to be engraved.

[0064] Step one: three workstations are provided on the clamp assembly, and three wooden chair leg blank parts are installed on the three workstations;

[0065] Step two: the tool is called from the chain tool magazine 2 by the tool changer 4, and the turning tool is called to turn the front end of the three wooden chair leg blank parts:

[0066] When turning, the α surface of the wooden chair leg blank part in one workstation is turned, the flange shaft 810 is rotated by rotating the turning shaft 7, the central gear 808 is rotated, the three planetary gears 807 are rotated, the planetary carrier electromagnetic clutch 802 is powered on at this time, the planetary carrier 803 is disconnected with the planetary carrier electromagnetic clutch 802, the rear shaft electromagnetic clutch 813 is powered on, the planetary front shaft 805 and the planetary rear shaft 814 are disconnected, the three workstations are rotated by 120 degrees around the central gear 808, and then the α surfaces of the second wooden chair leg blank part and the third wooden chair leg blank part are turned.

[0067] Step three: the tool is called from the chain tool magazine 2 by the tool changer 4, and the milling cutter is called to mill the rear end of the three wooden chair leg blank parts:

[0068] The rotation of the axle 7 drives the rotation of the flange shaft 810, the rotation of the flange shaft 810 drives the rotation of the central gear 808, the rotation of the central gear 808 drives the rotation of the three planetary gears 807 around the fixed shaft of the planet carrier 803, at this time, the circuit of the planet carrier electromagnetic clutch 802 is powered off, the planet carrier 803 is fixedly connected with the rotating clamp rear shell 801, the fixed shaft of the milling machining station is rotated, and the β surface of the wooden chair leg blank is milled. The circuit of the rear axle electromagnetic clutch 813 of the other two stations is powered on, the planet front axle 805 and the planet rear axle 814 are disconnected, and after the machining is completed, the rotation of the axle 7 drives the rotation of the flange shaft 810, the rotation of the flange shaft 810 drives the rotation of the central gear 808, the rotation of the central gear 808 drives the rotation of the three planetary gears 807 around the fixed shaft of the planet carrier 803, the circuit of the planet carrier electromagnetic clutch 802 is powered on, the planet carrier 803 and the planet carrier electromagnetic clutch 802 are disconnected, the circuit of the rear axle electromagnetic clutch 813 is powered on, the planet front axle 805 and the planet rear axle 814 are controlled to be disconnected through the rear axle electromagnetic clutch 813, the three stations are rotated by 120 degrees around the central gear 808 in turn, then the β surfaces of the other two wooden chair leg blanks are milled, and the discharging is completed by the mechanical hand.

[0069] Step four: the tool is called from the chain tool magazine 2 through the tool changing mechanical hand 4, and the carving is performed on the three wooden chair leg blanks by the calling carving tool.

[0070] The rotation of the axle 7 drives the rotation of the flange shaft 810, the rotation of the flange shaft 810 drives the rotation of the central gear 808, the rotation of the central gear 808 drives the rotation of the three planetary gears 807 around the fixed shaft of the planet carrier 803, the circuit of the planet carrier electromagnetic clutch 802 is powered off, the planet carrier 803 is fixedly connected with the rotating clamp rear shell 801, the fixed shaft of the milling machining station is rotated, and the β surface of the wooden chair leg blank is milled. The circuit of the planet carrier electromagnetic clutch 802 is powered on, the planet carrier 803 and the planet carrier electromagnetic clutch 802 are disconnected, the circuit of the rear axle electromagnetic clutch 813 is powered on, the planet front axle 805 and the planet rear axle 814 are controlled to be disconnected through the rear axle electromagnetic clutch 813, the three stations are rotated by 120 degrees around the central gear 808 in turn, then the β surfaces of the other two wooden chair leg blanks are milled, and the discharging is completed by the mechanical hand.

[0071] For a batch of chair legs requiring turning, milling, and carving, this fixture effectively saves clamping and tool-changing time. The specific processing flow is as follows: The robot first loads three blanks sequentially. The milling and turning of the wooden chair legs are performed on the rear and front ends respectively, with no specific order required. Assuming the machining center is currently using a turning tool, the front ends of the three pieces of wood are turned sequentially. After turning, the machining center switches to a milling cutter to mill the rear ends of the chair legs sequentially. At this point, the first group of three chair legs has completed the previous processing steps. After unloading, new wooden blanks are loaded. Since the machining center's tool is not switched to a milling cutter, the rear end faces of the newly clamped second batch of chair legs can be milled first. After milling, the machining center switches to a turning tool and repeats the turning of the front ends of the chair legs, and so on, thus saving tool-changing time and improving processing efficiency. After all the chair legs have completed the previous processing steps, carving is performed. The robot loads three pre-processed chair legs sequentially, and the machine tool begins carving. The three clamping stations sequentially complete the tasks of loading, processing, and waiting. When the chair legs at the processing station are being carved, the chair legs at the loading and unloading station are being loaded and unloaded. In a cycle, the machining center can process continuously, saving clamping time.

[0072] Example

[0073] like Figures 1-7 As shown, let A be the loading station, B be the machining station, and C be the unloading station. The first process is turning. First, the α surface of the machining station B is turned. Then, the rotation of the axle 7 drives the flange shaft 810 to rotate, which in turn drives the central gear 808 to rotate, which in turn drives the three planetary gears 807 to rotate. At this time, the planetary carrier electromagnetic clutch 802 is energized, and the planetary carrier 803 is disconnected from the planetary carrier electromagnetic clutch 802. The rear axle electromagnetic clutch 813 is energized, which controls the disconnection between the planetary front axle 805 and the planetary rear axle 814. This achieves a 120-degree rotation of stations A, B, and C around the central gear 808. Next, the α surfaces of the second and third wooden chair leg blanks are turned.

[0074] The milling cutter is called from the chain tool magazine 2 by the tool changing robot 4, and the third wooden chair leg blank is subjected to β surface milling processing at the B machining station. At this time, the axle 7 rotates to drive the flange shaft 810 to rotate, the flange shaft 810 drives the center gear 808 to rotate, the center gear 808 drives the three planetary gears 807 to rotate around the fixed shaft of the planet carrier 803. At this time, the planet carrier electromagnetic clutch 802 is de-energized, the planet carrier 803 is fixedly connected with the planet carrier electromagnetic clutch 802, the fixed shaft rotation of the B station is realized, and the processing of different milling surfaces is realized. At this time, the fixed shaft rotation of the B and C stations is not required, and in addition, the A and C are controlled to be disconnected between the planetary front shaft 805 and the planetary rear shaft 814 through the energization of the rear axle electromagnetic clutch 813 circuit. After the milling processing is completed, the axle 7 rotates to drive the flange shaft 810 to rotate, the flange shaft 810 drives the center gear 808 to rotate, the center gear 808 drives the three planetary gears 807 to rotate, the planet carrier electromagnetic clutch 802 is energized, the planet carrier 803 is disconnected with the planet carrier electromagnetic clutch 802, the rear axle electromagnetic clutch 813 is energized, the planetary front shaft 805 is controlled to be disconnected with the planetary rear shaft 814 through the rear axle electromagnetic clutch 813, the A, B and C stations are rotated by 120 degrees around the center gear 808, and then the second wooden chair leg blank and the first wooden chair leg blank are subjected to milling processing. After the milling is completed, the unloading is completed by the robot, and the loading is completed by the pneumatic chuck clamping 815 device of the chair leg,

[0075] At this time, the milling cutter is installed, the axle 7 rotates to drive the flange shaft 810 to rotate, the flange shaft 810 drives the center gear 808 to rotate, the center gear 808 drives the three planetary gears 807 to rotate, the planet carrier electromagnetic clutch 802 is energized, the planet carrier 803 is disconnected with the planet carrier electromagnetic clutch 802, the rear axle electromagnetic clutch 813 is energized, the planetary front shaft 805 is controlled to be disconnected with the planetary rear shaft 814 through the rear axle electromagnetic clutch 813, the A, B and C stations are rotated by 120 degrees around the center gear 808, and the β surface processing of the wooden chair leg blank is completed.

[0076] For a batch of chair legs subjected to turning and milling, then the engraving processing is required. The axle 7 rotates to drive the flange shaft 810 to rotate, the flange shaft 810 drives the center gear 808 to rotate, the center gear 808 drives the three planetary gears 807 to rotate around the fixed shaft of the planet carrier 803, the planet carrier electromagnetic clutch 802 is de-energized, the planet carrier 803 is fixedly connected with the planet carrier electromagnetic clutch 802, the fixed shaft rotation of the A station is realized, and the engraving processing is realized. At this time, the fixed shaft rotation of the B and C stations is not required, and in addition, the B and C are controlled to be disconnected between the planetary front shaft 805 and the planetary rear shaft 814 through the energization of the rear axle electromagnetic clutch 813 circuit. After the engraving is completed,

[0077] The rotation of the axle 7 drives the rotation of the flange shaft 810, the rotation of the flange shaft 810 drives the rotation of the central gear 808, the rotation of the central gear 808 drives the rotation of the three planetary gears 807, the circuit of the planet carrier electromagnetic clutch 802 is electrified, the planet carrier 803 and the planet carrier electromagnetic clutch 802 are disconnected, the circuit of the rear axle electromagnetic clutch 813 is electrified, the rear axle electromagnetic clutch 813 controls the disconnection between the front planet axle 805 and the rear planet axle 814, and the A, B and C stations are rotated by 120 degrees around the central gear 808, and then the second wooden chair leg blank and the third wooden chair leg blank are processed.

Claims

1. A machine tool with a dedicated chair leg clamp assembly, characterized by: It includes bed body (1), chain tool magazine (2), column (3), tool changing manipulator (4), Z-axis rotation (5), woodworking electric spindle (6), axle (7) and clamp assembly; The chain tool magazine (2) is slidably arranged above the bed body (1) through a slide rail, the column (3) is slidably arranged above the bed body (1) through a slide rail close to the chain tool magazine (2), the tool changing manipulator (4) and the Z-axis rotation (5) are installed on the two side faces of the column (3), the woodworking electric spindle (6) is installed on the Z-axis rotation (5), the woodworking electric spindle (6) is driven by the Z-axis rotation (5) to move in the vertical direction, a motor is installed on the bed body (1), the motor drives the axle (7) to rotate through a synchronous belt, the clamp assembly is installed on the bed body (1) close to the woodworking electric spindle (6), and the output end of the axle (7) is installed on the clamp assembly and controls the clamp assembly to clamp the chair leg.

2. A machine tool with a dedicated chair leg clamp assembly according to claim 1, characterized in that: The clamp assembly comprises a rotary clamp (8), a clamp center (9) and a sliding center support (10); The clamp center (9) is slidably arranged on the bed body (1) through the sliding center support (10), the rotary clamp (8) is arranged opposite to the clamp center (9) and is fixedly installed on the bed body (1), and the output end of the axle (7) is installed on the rotary clamp (8) and controls the rotary clamp (8) to clamp and release the chair leg.

3. A machine tool with a dedicated chair leg clamp assembly according to claim 2, characterized in that: The rotary clamp (8) comprises a shell, a planet carrier (803), a center gear (808), a flange shaft (810), three planet front shafts (805), three planet gears (807), three chucks (815) and three clamping jaws (816). The shell is installed on the bed body (1), the planet carrier (803) is installed in the shell, the flange shaft (810) penetrates through the planet carrier (803) and is rotationally connected with the shell, the axle (7) is rotationally connected and installed on the shell and connected with the center gear (808), the center gear (808) is sleeved on the flange shaft (810) to realize synchronous rotation, one planet gear (807) is sleeved on each planet front shaft (805), the three planet gears (807) are arranged around the outside of the center gear (808) in the radial direction and are in mesh with the center gear (808) respectively, one end of each planet front shaft (805) is rotationally connected and installed on the planet carrier (803), and the other end of each planet front shaft (805) is connected with the chuck (815).

4. A machine tool with a dedicated chair leg clamp assembly according to claim 3, characterized in that: The rotary clamp (8) further comprises a flange shaft deep groove ball bearing (811) and three front shaft deep groove ball bearings (804); the flange shaft (810) is rotationally connected with the shell through the flange shaft deep groove ball bearing (811), and each planet front shaft (805) is rotationally connected with the planet carrier (803) through the front shaft deep groove ball bearing (804).

5. A machine tool with a dedicated chair leg clamp assembly according to claim 4, characterized in that: The rotary clamp (8) further comprises a planet carrier electromagnetic clutch (802), a rear shaft electromagnetic clutch (813) and three planet rear shafts (814). The planet carrier (803) is connected with the shell through the planet carrier electromagnetic clutch (802), the rotation and stop of the shell are controlled by the planet carrier electromagnetic clutch (802), each planet front shaft (805) is connected with the planet rear shaft (814) through the rear shaft electromagnetic clutch (813), each chuck (815) is installed on the planet rear shaft (814), the rotation and stop of the planet rear shaft (814) are controlled by the rear shaft electromagnetic clutch (813).

6. A machine tool with a dedicated chair leg clamp assembly according to claim 5, characterized in that: The shell comprises a rotary clamp rear shell (801), a rotary workbench (812) and a rotary clamp front shell (817); The rotary clamp rear shell (801) is installed on one end of the rotary clamp front shell (817), the rotary workbench (812) is installed on the other end of the rotary clamp front shell (817), the flange shaft (810) is inserted into the rotary clamp rear shell (801), the flange shaft (810) is fixedly connected with the axle (7) through bolts, the other end of the flange shaft (810) is rotationally connected with the rotary workbench (812) through the flange shaft deep groove ball bearing (811), three chucks (815) are installed on the rotary workbench (812), and the planet carrier electromagnetic clutch (802) is arranged between the planet carrier (803) and the rotary clamp rear shell (801).

7. A machine tool with a dedicated chair leg clamp assembly according to claim 1, characterized in that: The clamp center (9) comprises a pneumatic tailstock (902), a pneumatic center support (904), a disc workbench (906), three centers (901) and three cylinders (903); the three cylinders (903) are evenly arranged and installed on the disc workbench (906) through the three pneumatic tailstocks (902) in the radial direction, each center (901) is installed on the extension end of the piston rod of each cylinder (903), the piston rod of the cylinder (903) drives the center (901) to move in the axial direction of the cylinder, and the three pneumatic tailstocks (902) and the three cylinders (903) rotate in the pneumatic center support (904).

8. A machine tool with a dedicated chair leg clamp assembly according to claim 7, characterized in that: The pneumatic center support (904) is a cylinder body with one end sealed, a sleeve is arranged at the center of the cylinder body, the disc workbench (906) is a circular plate body, a rod body is fixedly arranged at the center of the circular plate body, the rod body of the circular plate body is inserted into the sleeve of the cylinder body, and the circular plate body is arranged at the open end of the cylinder body.

9. A machine tool with a dedicated chair leg clamp assembly according to claim 8, characterized in that: The clamp center (9) further comprises a first bearing (905) and a second bearing (907); The first bearing (905) and the second bearing (907) are respectively installed at two ends of the sleeve, and the rod body of the circular plate body and the sleeve of the cylinder body are rotationally connected through the first bearing (905) and the second bearing (907).

10. A method of operating a machine tool to machine a chair leg with a dedicated chair leg clamp assembly according to any one of claims 1 to 9, characterised in that: The method is implemented according to the following steps: Step one: three workstations are arranged on the clamp assembly, and three wooden chair leg blank pieces are installed on the three workstations; Step two: a tool is called from the chain tool magazine (2) through the tool changing manipulator (4), and a turning tool is called to turn the front end of the three wooden chair leg blank pieces: When turning, the α surface of a wood chair leg blank is turned, the flange shaft (810) is driven to rotate by the rotation of the axle (7), the center gear (808) is driven to rotate, the three planetary gears (807) are driven to rotate, the planetary carrier electromagnetic clutch (802) is powered on at this time, the planetary carrier (803) is disconnected with the planetary carrier electromagnetic clutch (802), the rear axle electromagnetic clutch (813) is powered on, the planetary front axle (805) is disconnected with the planetary rear axle (814), the rotation of 120 degrees of the three stations around the center gear (808) is realized, and then the α surface of the second wood chair leg blank and the third wood chair leg blank is turned; Step three: the tool is called from the chain tool magazine (2) by the tool changing robot (4), and the milling cutter is called to mill the rear end of the three wood chair leg blanks: The axle (7) drives the flange shaft (810) to rotate, the flange shaft (810) drives the center gear (808) to rotate, the center gear (808) drives the three planetary gears (807) to rotate around the fixed shaft of the planetary carrier (803), the planetary carrier electromagnetic clutch (802) is powered off at this time, the planetary carrier (803) is fixedly connected with the rotary clamp rear shell (801), the turning station fixed shaft rotates, the β surface of the wood chair leg blank is milled, the rear axle electromagnetic clutch (813) of the other two stations is powered on, the planetary front axle (805) is disconnected with the planetary rear axle (814), after the machining is completed, the axle (7) is rotated to drive the flange shaft (810) to rotate, the flange shaft (810) drives the center gear (808) to rotate, the center gear (808) drives the three planetary gears (807) to rotate around the fixed shaft of the planetary carrier (803), the planetary carrier electromagnetic clutch (802) is powered on, the planetary carrier (803) is disconnected with the planetary carrier electromagnetic clutch (802), the rear axle electromagnetic clutch (813) is powered on, the planetary front axle (805) is disconnected with the planetary rear axle (814) through the rear axle electromagnetic clutch (813), the rotation of 120 degrees of the three stations around the center gear (808) is realized, and then the β surface of the other two wood chair leg blanks is milled, and the discharging is completed by the robot after the milling is completed; Step four: the tool is called from the chain tool magazine (2) by the tool changing robot (4), and the tool is called to mill the three wood chair leg blanks: The axle (7) rotates to drive the flange shaft (810) to rotate, the flange shaft (810) drives the center gear (808) to rotate, the center gear (808) drives the three planetary gears (807) to rotate around the planet carrier (803), the planet carrier electromagnetic clutch (802) is de-energized, the planet carrier (803) is fixedly connected with the rotary clamp rear shell (801), the fixed rotation of one station is realized, and the engraving work is carried out, then the axle (7) rotates to drive the flange shaft (810) to rotate, the flange shaft (810) drives the center gear (808) to rotate, the center gear (808) drives the three planetary gears (807) to rotate, the planet carrier electromagnetic clutch (802) is energized, the planet carrier (803) is disconnected with the planet carrier electromagnetic clutch (802), the rear axle electromagnetic clutch (813) is energized, the planet front axle (805) and the planet rear axle (814) are disconnected, three stations are rotated by 120 degrees around the center gear (808), then the other two wooden chair leg blanks are engraved, and the engraving work is completed.

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