A machining center with a multi-tool quick-change mechanism

Abstract

The present invention discloses a machining center with a multi-tool head fast tool change mechanism, comprising a frame, a workbench and a machining tool, wherein the machining tool comprises a tool head and a first power device for driving the tool head to rotate, wherein the machining center further comprises a tool magazine located on the side of the workbench for providing a tool head for tool change by a broaching device, the tool magazine comprising a tool disc with multiple tool holders, a tool head clamped on the tool holder, and a second power device for driving the tool disc to rotate forward and reversely so that one of the vacant tool holders or the replaced tool head faces the broaching device; a third power device for driving the broaching device to move rapidly in a horizontal direction to approach or move away from the tool magazine; a fourth power device for driving the broaching device to move rapidly in a vertical direction to approach or move away from the tool magazine; and a broaching device. Compared with the prior art, the present invention reduces the working steps of the tool magazine in the tool change step and does not have an extra upward movement step after the tool change, thereby effectively improving the tool change efficiency of the entire machining center.

Description

Technical Field

[0001] The invention belongs to the technical field of machining centers, and in particular relates to a machining center with a multi-tool quick-change tool mechanism. Background Art

[0002] A machining center is a machine tool used for CNC machining. It is a highly automated mechanical processing equipment. Its working characteristics are that it has a tool magazine that can complete automatic tool changing. After the workpiece is clamped once, according to the pre-compiled CNC machining program, the machining center can automatically select the processing method, change the tool, automatically align the tool, automatically change the spindle speed, feed rate, etc. It can complete multiple processes continuously, reducing the time of auxiliary processes such as workpiece clamping, measurement and machine tool adjustment.

[0003] However, the existing automatic tool changing method adopts the method of left and right lateral movement and then rotation to change the tool, such as the Chinese invention patent with authorization announcement number CN105171074B, which discloses a gantry vertical CNC double-head double-tool magazine milling machine processing center, in which the tool magazine of the tool changing mechanism is set on the upper side of the workbench, and the tool is changed by lateral movement, as described in paragraph 36 of its specification: The automatic tool changing working steps are as follows: a. First, the left spindle milling cutter head 25 is automatically opened to the tool head positioning position 39 of its tool changing position, and the Nth tool at the target position of the left tool magazine 28 is automatically transferred to the vertical downward lower tool 1# position; b. The tool body is rotated 90° so that the tool handle is facing upward, which is like the tool placement position 36, and the tool cylinder 21 above the right spindle is actuated, and the internal tool rod is used to hit the tool, and one end of a tool receiving rod 37 receives the Nth milling cutter in the tool magazine, and the other end receives the left spindle milling cutter head 25 The tool on the left is taken down; c then the left tool changing mechanism 35 oil cylinder moves down to its position, and then the tool connecting rod 37 rotates 180° to replace the milling cutter; d the left tool changing mechanism 35 oil cylinder rises, the new milling cutter handle is installed on the spindle, and the old milling cutter is put back to the tool placement position 36, and the tool magazine claw rotates 90° to put the milling cutter into the left tool magazine 28.

[0004] Since the above tool changing steps are too complicated, resulting in a long tool changing time, and the structure is complex and maintenance is inconvenient, it is necessary to provide another tool changing method to improve the tool changing efficiency of the machining center. Summary of the invention

[0005] The purpose of the present invention is to provide a machining center with a multi-tool quick tool changing mechanism in order to solve the above-mentioned technical problems. The tool changing mechanism of the machining center can improve the tool changing efficiency by reducing the tool changing steps and tool changing stroke.

[0006] The object of the present invention is achieved as follows: a machining center with a multi-tool quick tool change mechanism comprises a frame, a workbench arranged on the frame, and a machining tool located above the workbench, wherein the machining tool comprises a tool head and a first power device for driving the tool head to rotate, wherein the machining center also comprises

[0007] A tool magazine, located at the side of the workbench to provide a tool head for the broaching device, the tool magazine comprises a tool disc with a plurality of tool holders, tool heads clamped on the tool holders, and a second power device for driving the tool disc to rotate forward and reverse so that one of the vacant tool holders or the replaced tool head faces the broaching device;

[0008] A third power device is used to drive the broaching device to move rapidly in a horizontal direction to approach or move away from the tool magazine;

[0009] A fourth power device, used for driving the broaching device to move rapidly in a vertical direction to approach or move away from the tool magazine;

[0010] A broaching device is arranged on the first power device and is used for the fourth power device to drive the broaching device to move in a vertical direction to one of the cutting bits of the cutting disc, then clamp the cutting bit, and drive the broaching device away from the cutting disc by the third power device to make the cutting bit detach from the tool holder; and the third power device drives the broaching device to move in a horizontal direction to one of the vacant tool holders of the cutting disc, then releases the cutting bit on it and embeds it into the tool holder, and drives the broaching device away from the cutting disc by the fourth power device to make the cutting bit detach from the broaching device.

[0011] By adopting the above technical solution, the traditional tool changing method is to use left and right lateral movement, which has a large stroke and takes a long time. In this regard, the present invention adopts an up and down movement method to change the tool; the first power device is used to drive the tool head to rotate to process the product on the workbench, and the third power device and the fourth power device are used to drive the first power device and the tool head to move horizontally and vertically above the workbench so that the tool head acts on different positions of the product. In order to reduce the tool changing stroke, the present invention sets the tool magazine on the side of the workbench;

[0012] When the first power device drives the cutter head to rotate and processes the product to a certain extent, when the tool needs to be changed for further processing, the fourth power device drives the first power device and the cutter head to move vertically upward so that the broaching device and the tool magazine are on the same plane, and then the third power device drives the first power device and the cutter head to move horizontally and approach the tool magazine. During this process, the second power device drives the cutter disc to rotate so that the empty tool holder is facing the broaching device. When the broaching device moves to the empty tool holder, the broaching device will loosen the cutter head on it and embed the cutter head into the tool holder. Then the fourth power device drives the first power device and the broaching device to move upward again, so that the broaching device is separated from the cutter head thereon. Then the second power device drives the cutter disc to rotate again so that the required cutter head is facing the broaching device. The fourth power device drives the first power device and the broaching device downward again so that the broaching device clamps the required cutter head. Finally, the third power device drives the first power device and the broaching device to move horizontally so that the cutter head is separated from the tool holder, and the tool change is completed.

[0013] Then the fourth power device drives the first power device and the broaching device downward to further process the product on the workbench. The tool changing step reduces the working steps of the tool magazine and there is no extra upward movement step after tool changing, thereby effectively improving the tool changing efficiency of the entire machining center.

[0014] The present invention is further configured as follows: the first power device is a servo motor 1, and the output shaft of the servo motor 1 is arranged downward; the tool head includes a tool head portion and a handle portion arranged on the tool head portion; the tool pulling device includes a hollow sleeve and a pulling sleeve located in the sleeve and movably arranged along its length direction, the sleeve is vertically arranged, and its upper end is connected to the servo motor 1 through a transmission rod, the handle portion of the tool head can be embedded in the sleeve along the vertical direction, and a limiting portion is arranged in the sleeve for limiting the continued upward movement of the handle portion after the handle portion is embedded in the sleeve to a certain extent, and a positioning groove is provided at the lower end of the pulling sleeve for the handle portion to be embedded in A plurality of mounting holes connected to the positioning groove are provided on the outer wall of the pull sleeve, and the plurality of mounting holes are evenly distributed in the circumferential direction. A ball is arranged in the mounting hole and is movably arranged along the axial direction thereof. After the tool handle is embedded in the positioning groove, the ball can move toward the inner side of the pull sleeve and clamp the tool handle under the guidance of the inner wall of the sleeve. An annular guide groove is also provided on the inner wall of the sleeve and is radially opened outward to provide space for the ball to move toward the outer side of the pull sleeve and to separate from the tool handle. The tool pulling device also includes a driving member for controlling the movement state of the pull sleeve to clamp or release the tool handle of the tool head.

[0015] By adopting the above technical solution, the servo motor can control the rotation speed by itself, and the position accuracy is very accurate. For this purpose, a servo motor is used to drive the broaching device and the cutter head located on the broaching device to rotate, thereby processing the product on the workbench; the cutter head on the cutter head is used to process the product, and the tool handle provides a tensioning head for the cutter head. The broaching device fixes the cutter head by tightening the tool handle;

[0016] When replacing the cutter head, the broaching device moves laterally so that the cutter head clamped on the broaching device is embedded in the tool holder, and then the driving component drives the pulling sleeve to move downward so that the ball on the pulling sleeve is located in the annular guide groove. At this time, since the annular guide groove provides space for the ball to move to the outside of the pulling sleeve, the ball cannot be subjected to force on the shank of the cutter head, that is, the broaching device is in a loose state at this time; then, under the action of the fourth power device, the sleeve on the broaching device moves upward so that the cutter head thereon is disengaged and clamped by the tool holder, and then the second power device drives the cutter disc to rotate so that the required cutter head is opposite to the sleeve, and then the fourth power drives the sleeve to move downward and the shank on the cutter head is embedded in the positioning groove, and the driving component drives the pulling sleeve to move upward so that the ball slides along the inner wall of the annular guide groove and disengages from the annular guide groove, and the shank is limited to move upward by the limiting portion, the inner wall of the sleeve presses against the ball, and the ball presses against the shank, limiting the downward movement of the shank, that is, the broaching device is in a broaching state at this time.

[0017] The present invention is further configured as follows: the knife handle portion includes a handle body and a handle head located at the end of the handle body, the handle body is in a truncated cone shape, and its outer diameter gradually decreases from the knife head portion to the handle head, and the limiting portion is a conical surface on the inner wall of the sleeve that is adapted to the outer wall of the handle body; the handle head is cylindrical, and an annular groove is radially opened inward on its outer wall for the ball to be embedded in.

[0018] By adopting the above technical solution, the handle part is divided into a handle body and a handle head. The handle body is set to a conical surface to limit the upward movement of the handle part. The handle head is provided with an annular groove to facilitate the ball to be embedded in the annular groove to limit the downward movement of the handle part. The handle part has a simple structure, strong practicality, and is easy to process.

[0019] The present invention is further configured as follows: a first guide surface with a certain slope is provided on the outer wall of the end of the handle head for guiding the ball to move toward the outside of the pull sleeve when the pull sleeve is driven downward; and a second guide surface with a certain slope is provided on the inner wall of the annular groove of the sleeve near the end of the handle head for guiding the ball to move toward the outside of the pull sleeve when the pull sleeve is driven upward.

[0020] By adopting the above technical solution, a first guide surface and a second guide surface are respectively provided on the handle and the annular groove of the sleeve, so as to guide the ball to move to the outside of the pull sleeve and avoid scratching the ball.

[0021] The present invention is further configured as follows: the driving member includes a pull rod, a spring, a connecting member, a transmission sleeve and a reset swing arm, the pull rod is arranged in the sleeve along the vertical direction, the lower end of which is fixed on the pull sleeve, and the upper end of which is connected to the connecting member, the transmission sleeve is sleeved on the sleeve, and a guide hole leading to the connecting member is opened on the outer wall of the sleeve, and a connecting rod is provided on the side end of the connecting member after extending out of the guide hole and connected to the transmission sleeve, a limiting ring is fixed on the inner wall of the sleeve, the spring is sleeved on the pull rod and the upper end is pressed against the The connecting member has its lower end pressed against the limiting ring to drive the connecting member to move upward, so that the connecting rod thereon presses against the upper inner wall of the guide hole, and the ball on the pull rod disengages from the annular guide groove. The reset swing arm is arranged on the transmission sleeve, and the driving member also includes a baffle fixed on the frame and located above the tool magazine, which is used for the third power device to drive the broaching device to move to the tool magazine and then guide the reset swing arm to swing so that the transmission sleeve moves downward and the ball on the pulling sleeve rolls into the annular guide groove.

[0022] By adopting the above technical scheme, when the broaching device moves close to the tool magazine, the tool head thereon is embedded into the vacant tool holder or the tool head on the tool holder is embedded into the sleeve or the pulling sleeve, during this process, the reset swing arm contacts the baffle plate, the reset swing arm drives the transmission sleeve to move downward, the transmission sleeve drives the connecting rod, the connecting piece and the pulling sleeve to move downward, and the ball bearing on the pulling sleeve moves into the annular guide groove, at which time the broaching device is in a tool releasing state; when the broaching device moves away from the tool magazine and the reset swing arm is disengaged from the block, the spring drives the connecting piece to move upward under the action of elastic force, the connecting piece drives the pulling sleeve, the connecting rod and the transmission sleeve to move upward, and the ball bearing on the pulling sleeve is disengaged from the annular groove, at which time the broaching device is in a tool broaching state; the driving part of the broaching device has a simple structure, is low in cost and does not consume energy compared to actuators such as cylinders.

[0023] The present invention is further configured as follows: the plurality of tool holders are a plurality of buckles evenly distributed on the side wall of the tool disc along the circumferential direction, the buckles are annular structures and have a certain elastic deformation ability, and the side ends thereof have openings, and after the buckles are pulled outward or squeezed inward, the openings increase or decrease.

[0024] By adopting the above technical scheme, the buckle can be made of plastic with a certain elastic recovery ability, which is very convenient to install, repair and replace, and the main thing is that the production cost and maintenance cost are low; the broaching device drives the tool head to move laterally, and after the tool head passes through the opening of the buckle, the opening is squeezed outward. When the tool head is embedded in the buckle, the opening is immediately restored and the tool head is clamped. Since the broaching device is in a tool loosening state at this time, after the broaching device moves up, the tool head will be detached from the broaching device and clamped by the buckle. When the broaching device moves down, the tool head on the buckle is embedded in the sleeve and the pulling sleeve. Although the broaching device is in a tool loosening state at this time, after the broaching device moves laterally away from the tool magazine, the tool head on the buckle is detached from the buckle through the opening, and the spring will then drive the pulling sleeve to move up, thereby tightening the tool head.

[0025] The present invention is further configured as follows: there are two parallel limiting flanges on the handle portion, and there is a certain distance between the two limiting flanges; the clip is provided with a limiting flange which is embedded in the gap between the two limiting flanges after the cutter head is clipped onto the clip in the horizontal direction.

[0026] By adopting the above technical solution, in order to prevent the cutter head from detaching from the lower end of the buckle after being subjected to a large vertical downward external force, two limiting flanges are provided on the handle and a limiting flange is provided on the buckle to limit the cutter head clamped on the buckle.

[0027] The present invention is further configured as follows: the second power device is a servo motor 2 with an output shaft facing upward, and the cutter disc is arranged on the output shaft of the servo motor 2;

[0028] The frame is provided with a crossbeam which is located above the workbench and is arranged transversely, and the crossbeam is provided with two parallel first guide rails arranged along its length direction and a first sliding seat which is slidably arranged on the two first guide rails, the servo motor 1 is fixed on the first sliding seat, the sleeve and the transmission rod are rotatably arranged on the first sliding seat, the crossbeam is also provided with a first ball screw located between the two first guide rails, the nut seat on the first ball screw is fixed on the first sliding seat, and the third power device is a servo motor 3 whose output shaft is connected to the first ball screw;

[0029] The first sliding seat is provided with two second guide rails arranged in the vertical direction and a second sliding seat slidably arranged on the two second guide rails. The first sliding seat is also provided with a second ball screw located between the two second guide rails. The nut seat on the second ball screw is fixed on the second sliding seat. The fourth power device is a servo motor four whose output shaft is connected to the second ball screw.

[0030] By adopting the above technical scheme, the cutter disc is driven to rotate by servo motor 2, so that the cutter head or empty tool holder on the cutter disc can be accurately made to face the broaching device; the first ball screw is driven to rotate by servo motor 3, thereby driving the first sliding seat to move back and forth laterally on the first guide rail; the second ball screw is driven to rotate by servo motor 4, thereby driving the second sliding seat to move back and forth vertically on the second guide rail. The cutter head on the broaching device is precisely controlled by the servo system, so that the product on the workbench can be processed, which can effectively improve the stability of processing quality, processing accuracy and processing efficiency.

[0031] The present invention is further configured as follows: the frame is provided with two third guide rails arranged along the longitudinal direction, the workbench is slidably arranged on the two second guide rails, a third ball screw is also arranged between the two guide rails, the nut seat on the third ball screw is fixed on the workbench, and the machining center also includes a servo motor five whose output shaft is connected to the third ball screw.

[0032] By adopting the above technical solution, the workbench is set on the frame along the longitudinal sliding direction, and the workbench is driven to move by the servo motor five, so as to facilitate the adjustment of the position between the product on the workbench and the tool head on the broaching device, thereby facilitating the processing of the product.

[0033] The beneficial effects of the present invention are: 1. Compared with the prior art, the present invention reduces the working steps of the tool magazine in the tool changing step and does not have unnecessary upward moving steps after the tool changing, thereby effectively improving the tool changing efficiency of the entire machining center; 2. By replacing the tool receiving rod, lifting table tool cylinder and other devices in the traditional tool changing mechanism with the third power device and the fourth power device of the tool feed device in the machining center, the parts of the entire machining center are effectively reduced, thereby reducing the production cost and improving the market competitiveness of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0035] Figure 2 It is a three-dimensional structural schematic diagram of another viewing angle of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the cutter head of the present invention;

[0037] Figure 4 It is a schematic diagram of the connection structure between the machining tool and the broaching device of the present invention;

[0038] Figure 5 It is a structural schematic diagram of the broach device of the present invention;

[0039] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0040] Figure 7 yes Figure 5 The enlarged view of point B in the middle;

[0041] Figure 8 yes Figure 5 Enlarged view of point C in the middle;

[0042] Fig. 9 It is a structural schematic diagram of the tool magazine of the present invention;

[0043] The reference numerals in the figure are: 1, frame; 11, crossbeam; 12, first guide rail; 13, first sliding seat; 14, first ball screw; 15, second guide rail; 16, second sliding seat; 17, second ball screw; 18, third guide rail; 19, third ball screw; 2, workbench; 3, machining tool; 31, tool head; 311, tool head; 312, tool handle; 3121, handle body; 3122, handle head; 3123, annular groove; 3124, first guide surface; 3125, second guide surface; 3126, limit flange; 32, first power device; 4, tool magazine; 41, tool disc; 42, tool holder; 421, opening; 422, Limiting flange; 43, second power device; 5, third power device; 6, fourth power device; 7, broaching device; 71, sleeve; 711, limiting portion; 712, annular guide groove; 713, guide hole; 714, limiting ring; 72, pulling sleeve; 721, positioning groove; 722, mounting hole; 723, ball bearing; 73, transmission rod; 74, driving member; 741, pulling rod; 742, spring; 743, connecting member; 744, transmission sleeve; 745, reset swing arm; 746, connecting rod; 747, baffle; 8, servo motor five. DETAILED DESCRIPTION

[0044] In order to enable technicians in this field to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings, wherein the horizontal, longitudinal and vertical directions mentioned in the present invention refer to the X-axis, Y-axis and Z-axis in the machine tool.

[0045] A machining center with a multi-tool quick-change tool mechanism, such as Figure 1 and Figure 2 As shown, the machining center includes a frame 1, a workbench 2 arranged on the frame 1, and a machining tool 3 located above the workbench 2. The machining tool 3 includes a tool head 31 and a first power device 32 that drives the tool head 31 to rotate. The machining center also includes

[0046] The tool magazine 4 is located at the side of the workbench 2 to provide the tool heads for the broaching device 7 to change tools. The tool magazine 4 includes a tool disc 41 with a plurality of tool holders 42, tool heads clamped on the tool holders 42, and a second power device 43 for driving the tool disc 41 to rotate forward and reverse so that one of the vacant tool holders 42 or the replaced tool head faces the broaching device 7.

[0047] The third power device 5 is used to drive the broaching device 7 to move rapidly in the horizontal direction to approach or move away from the tool magazine 4;

[0048] The fourth power device 6 is used to drive the broaching device 7 to move quickly in the vertical direction to approach or move away from the tool magazine 4;

[0049] The broaching device 7 is arranged on the first power device 32 and is used for the fourth power device 6 to drive the broaching device 7 to move in the vertical direction to one of the cutting bits of the cutting disc 41 and then clamp the cutting bit, and drive the broaching device 7 away from the cutting disc 41 by the third power device 5 to make the cutting bit 31 detach from the tool holder 42; and the third power device 5 drives the broaching device 7 to move in the horizontal direction to one of the vacant tool holders 42 of the cutting disc 41 and then releases the cutting bit 31 thereon and embeds it into the tool holder 42, and drives the broaching device 7 away from the cutting disc 41 by the fourth power device 6 to make the cutting bit detach from the broaching device 7.

[0050] The traditional tool changing method is to use left and right lateral movement, which has a large stroke and takes a long time. In this regard, the present invention uses an up and down movement method to change the tool; the first power device 32 is used to drive the cutter head 31 to rotate to process the product on the workbench 2, and the third power device 5 and the fourth power device 6 are used to drive the first power device 32 and the cutter head 31 to move horizontally and vertically above the workbench 2 so that the cutter head 31 acts on different positions of the product. In order to reduce the tool changing stroke, the present invention sets the tool magazine 4 on the side of the workbench 2;

[0051] When the first power device 32 drives the cutter head 31 to rotate and processes the product to a certain extent, when the tool needs to be changed for further processing, the fourth power device 6 drives the first power device 32 and the cutter head 31 to move vertically upward so that the broaching device 7 and the tool magazine 4 are on the same plane, and then the third power device 5 drives the first power device 32 and the cutter head 31 to move horizontally and close to the tool magazine 4. During this process, the second power device 43 drives the cutter disc 41 to rotate so that the empty tool holder 42 is facing the broaching device 7. When the broaching device 7 moves to the empty tool holder 42, the broaching device 7 will move the cutter head on it. 31 is released and the cutter head 31 is embedded in the cutter holder 42, then the fourth power device 6 drives the first power device 32 and the broaching device 7 to move upward, so that the broaching device 7 is separated from the cutter head 31 thereon, then the second power device 43 drives the cutter disc 41 to rotate so that the required cutter head is opposite to the broaching device 7, the fourth power device 6 drives the first power device 32 and the broaching device 7 to move downward so that the broaching device 7 clamps the required cutter head, and finally the third power device 5 drives the first power device 32 and the broaching device 7 to move horizontally so that the cutter head is separated from the cutter holder 42, and the tool change is completed;

[0052] Then the fourth power device 6 drives the first power device 32 and the broaching device 7 downward to further process the product on the workbench 2. The tool changing step reduces the working steps of the tool magazine 4 and there is no extra upward movement step after the tool changing, thereby effectively improving the tool changing efficiency of the entire machining center.

[0053] The first power device 32 is a servo motor 1, and the output shaft of the servo motor 1 is arranged downward;

[0054] The second power device 43 is a servo motor 2 with an output shaft facing upward, and the cutter head 41 is arranged on the output shaft of the servo motor 2;

[0055] The frame 1 is provided with a crossbeam 11 which is located above the workbench 2 and is arranged transversely. The crossbeam 11 is provided with two parallel first guide rails 12 arranged along its length direction and a first sliding seat 13 which is slidably arranged on the two first guide rails 12. The servo motor 1 is fixed on the first sliding seat 13. The crossbeam 11 is also provided with a first ball screw 14 located between the two first guide rails 12. The nut seat on the first ball screw 14 is fixed on the first sliding seat 13. The third power device 5 is a servo motor 3 whose output shaft is connected to the first ball screw 14.

[0056] The first sliding seat 13 has two second guide rails 15 arranged in the vertical direction and a second sliding seat 16 slidably arranged on the two second guide rails 15. The first sliding seat 13 is also provided with a second ball screw 17 located between the two second guide rails 15. The nut seat on the second ball screw 17 is fixed on the second sliding seat 16. The fourth power device 6 is a servo motor four whose output shaft is connected to the second ball screw 17.

[0057] The servo motor can control the rotation speed by itself, and the position accuracy is very accurate. For this purpose, servo motor 1 is used to drive the broaching device 7 and the tool head 31 located on the broaching device 7 to rotate, so as to process the product on the workbench 2; servo motor 2 drives the tool disc 41 to rotate, so that the tool head or the empty tool holder 42 on the tool disc 41 can be accurately made to face the broaching device 7; servo motor 3 drives the first ball screw 14 to rotate, and then drives the first sliding seat 13 to move back and forth horizontally on the first guide rail 12; servo motor 4 drives the second ball screw 17 to rotate, and then drives the second sliding seat 16 to move back and forth vertically on the second guide rail 15. The tool head 31 on the broaching device 7 is accurately controlled by the servo system, so as to process the product on the workbench 2, which can effectively improve the stability of the processing quality, the processing accuracy and the processing efficiency.

[0058] There are two third guide rails 18 arranged along the longitudinal direction on the frame 1, the workbench 2 is slidably set on the two second guide rails 15, and a third ball screw 19 is also arranged between the two guide rails. The nut seat on the third ball screw 19 is fixed on the workbench 2, and the machining center also includes a servo motor 5 8 whose output shaft is connected to the third ball screw 19.

[0059] The workbench 2 is longitudinally slidably arranged on the frame 1, and the workbench 2 is driven to move by the servo motor 5 8, so as to facilitate the adjustment of the position between the product on the workbench 2 and the tool head 31 on the broaching device 7, thereby facilitating the processing of the product.

[0060] like Figure 3 As shown, the cutter head 31 includes a cutter head portion 311 and a cutter handle portion 312 disposed on the cutter head portion 311;

[0061] like Figure 4 As shown, the broaching device 7 includes a hollow sleeve 71 and a broaching sleeve 72 located in the sleeve 71 and movably arranged along the length direction thereof. The sleeve 71 is arranged vertically, and its upper end is connected to the servo motor 1 through a transmission rod 73. The sleeve 71 and the transmission rod 73 are rotatably arranged on the first sliding seat 13 in the circumferential direction, and the handle portion 312 of the cutter head 31 can be embedded in the sleeve 71 along the vertical direction;

[0062] like Figure 5 , Figure 6 , Figure 7 as well as Figure 8As shown, the sleeve 71 is provided with a limit portion 711 for limiting the further upward movement of the handle portion 312 after the handle portion 312 is embedded in the sleeve 71 to a certain extent. An embedded positioning groove 721, a plurality of mounting holes 722 connected to the positioning groove 721 are provided on the outer wall of the pull sleeve 72, and the plurality of mounting holes 722 are evenly distributed along the circumferential direction, and a ball 723 is movably arranged along its axial direction in the mounting hole 722. After the shank portion 312 is embedded in the positioning groove 721, the ball 723 can move toward the inner side of the pull sleeve 72 and clamp the shank portion 312 under the guidance of the inner wall of the sleeve 71. An annular guide groove 712 is also provided on the inner wall of the sleeve 71 and radially outwardly opened to provide space for the ball 723 to move toward the outer side of the pull sleeve 72 and to separate it from the shank portion 312. The broaching device 7 also includes a driving member 74 for controlling the movement state of the pull sleeve 72 to clamp or release the shank portion 312 of the cutter head 31.

[0063] The cutter head 311 on the cutter head 31 is used for processing products, and the handle 312 provides a tensioning head for the cutter head 311. The broaching device 7 tightens the handle 312 to fix the cutter head 31.

[0064] When replacing the cutter head 31, the broaching device 7 moves horizontally, so that the cutter head 31 clamped on the broaching device 7 is embedded in the tool holder 42, and then the driving component drives the pull sleeve 72 to move downward, so that the ball 723 on the pull sleeve 72 is located in the annular guide groove 712. At this time, since the annular guide groove 712 provides space for the ball 723 to move to the outside of the pull sleeve 72, the ball 723 cannot be subjected to force on the handle portion 312 of the cutter head 31, that is, the broaching device 7 is in a loose state at this time;

[0065] Subsequently, under the action of the fourth power device 6, the sleeve 71 on the broaching device 7 moves upward, so that the cutter head 31 thereon is disengaged and clamped by the tool holder 42, and then the second power device 43 drives the cutter disc 41 to rotate, so that the required cutter head is opposite to the sleeve 71, and then the fourth power drives the sleeve 71 to move downward and the handle portion 312 on the cutter head is embedded in the positioning groove 721, and the driving member 74 drives the sleeve 72 to move upward so that the ball 723 slides along the inner wall of the annular guide groove 712 and disengages from the annular guide groove 712, and the handle portion 312 is limited to move upward by the limiting portion 711, and the inner wall of the sleeve 71 presses against the ball 723, and the ball 723 presses against the handle portion 312, limiting the handle portion 312 from moving downward, that is, the broaching device 7 is in the broaching state at this time.

[0066] like Figure 3As shown, the handle portion 312 includes a handle body 3121 and a handle head 3122 located at the end of the handle body 3121. The handle body 3121 is in a truncated cone shape, and its outer diameter gradually decreases from the blade head 311 to the handle head 3122. The limiting portion 711 is a conical surface on the inner wall of the sleeve 71 that is compatible with the outer wall of the handle body 3121; the handle head 3122 is cylindrical, and an annular groove 3123 is radially opened inward on its outer wall for the ball 723 to be embedded.

[0067] The handle portion 312 is divided into a handle body 3121 and a handle head 3122. The handle body 3121 is set to a conical surface to limit the upward movement of the handle portion 312. The handle head 3122 has an annular groove 3123 to facilitate the ball 723 to be embedded in the annular groove 3123 to limit the downward movement of the handle portion 312. The handle portion 312 has a simple structure, strong practicality, and is easy to process.

[0068] like Figure 5 , Figure 6 as well as Figure 7 As shown, the driving member 74 includes a pull rod 741, a spring 742, a connecting member 743, a transmission sleeve 744 and a reset swing arm 745. The pull rod 741 is arranged in the sleeve 71 along the vertical direction, and its lower end is fixed on the pull sleeve 72, and its upper end is connected to the connecting member 743. The transmission sleeve 744 is sleeved on the sleeve 71, and a guide hole 713 leading to the connecting member 743 is opened on the outer wall of the sleeve 71. The side end of the connecting member 743 is provided with a protruding guide hole. A connecting rod 746 connected to the transmission sleeve 744 behind the hole 713, a limiting ring 714 is fixed on the inner wall of the sleeve 71, and a spring 742 is sleeved on the pull rod 741 and the upper end is pressed against the connecting piece 743, and the lower end is pressed against the limiting ring 714 to drive the connecting piece 743 to move upward, so that the connecting rod 746 thereon is pressed against the upper inner wall of the guide hole 713, and the ball 723 on the pull rod 741 is disengaged from the annular guide groove 712, and the reset swing arm 745 is arranged on the transmission sleeve 744. The frame 1 is also provided with a baffle 747 located above the tool magazine 4, which is used for the third power device 5 to drive the broaching device 7 to move to the tool magazine 4 to guide the reset swing arm 745 to swing so that the transmission sleeve 744 moves downward and the ball 723 on the pulling sleeve 72 is embedded in the annular guide groove 712. The driving member 74 also includes a baffle 747 fixed on the frame 1 and located above the tool magazine 4, which is used for the third power device 5 to drive the broaching device 7 to move to the tool magazine 4 and then guide the reset swing arm 745 to swing so that the transmission sleeve 744 moves downward and the ball 723 on the pulling sleeve 72 rolls into the annular guide groove 712.

[0069] When the broaching device 7 moves close to the tool magazine 4, the tool head 31 thereon is embedded in the vacant tool holder 42 or the tool head on the tool holder 42 is embedded in the sleeve 71 and the pull sleeve 72. During this process, the reset swing arm 745 contacts the baffle plate 747, and the reset swing arm 745 drives the transmission sleeve 744 to move downward, and the transmission sleeve 744 drives the connecting rod 746, the connecting piece 743 and the pull sleeve 72 to move downward, and the ball 723 on the pull sleeve 72 moves to the annular guide groove 712. At this time, the broaching device 7 is in a tool releasing state; when the broaching device 7 is away from the tool magazine 4 and the reset swing arm 745 is out of the block, the spring 742 drives the connecting member 743 to move upward under the action of elastic force, and the connecting member 743 drives the pulling sleeve 72, the connecting rod 746 and the transmission sleeve 744 to move upward, and makes the ball 723 on the pulling sleeve 72 disengage from the annular groove, and the broaching device 7 is in a tool pulling state; the driving member 74 of the broaching device 7 has a simple structure, and compared with the use of actuators such as cylinders, it has low cost and does not consume energy.

[0070] like Fig. 9 As shown, the multiple tool holders 42 are multiple buckles evenly distributed on the side wall of the tool disc 41 along the circumferential direction. The buckles are annular structures and have a certain elastic deformation ability. The side ends thereof have openings 421. When the buckles are pulled outward or squeezed inward, the openings 421 increase or decrease.

[0071] The buckle can be made of plastic with a certain elastic recovery ability, which is very convenient to install, repair and replace, and the main thing is that the production cost and maintenance cost are low; the broaching device 7 drives the tool head 31 to move laterally, and after the tool head 31 passes through the opening 421 of the buckle, the opening 421 is squeezed outward. When the tool head 31 is embedded in the buckle, the opening 421 is immediately restored and the tool head 31 is clamped. Since the broaching device 7 is in a loose state at this time, after the broaching device 7 moves up, the tool head 31 will be separated from the broaching device 7 and clamped by the buckle. When the broaching device 7 moves down, the tool head on the buckle is embedded in the sleeve 71 and the pulling sleeve 72. At this time, although the broaching device 7 is in a loose state, after the broaching device 7 moves laterally away from the tool magazine 4, the tool head on the buckle is separated from the buckle through the opening 421, and the spring 742 will then drive the pulling sleeve 72 to move up, thereby tightening the tool head 31.

[0072] Optimized, in order to avoid the guide ball 723 from scratching the ball 723 when it moves to the outside of the pull sleeve 72, as Figure 3 As shown, a first guide surface 3124 with a certain slope is provided on the outer wall of the end of the handle head 3122 for guiding the ball 723 to move toward the outside of the pull sleeve 72 when the pull sleeve 72 is driven downward; the inner wall of the annular groove 3123 of the sleeve 71 near the end of the handle head 3122 is a second guide surface 3125 with a certain slope for guiding the ball 723 to move toward the outside of the pull sleeve 72 when the pull sleeve 72 is driven upward.

[0073] Optimized, in order to prevent the cutter head 31 from being separated from the lower end of the buckle after being subjected to a large vertical downward external force, such as Figure 3 as well as Fig. 9 As shown, there are two parallel limit flanges 3126 on the handle portion 312, and there is a certain distance between the two limit flanges 3126. The clip is provided with a limit flange 422 which is embedded in the gap between the two limit flanges 3126 after the cutter head 31 is clipped on the clip in the horizontal direction.

[0074] The above embodiments are only preferred embodiments of the present invention, rather than all embodiments. Other embodiments obtained based on the above embodiments by ordinary technicians in this field without making creative work should belong to the scope of protection of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A machining center with a multi-tool quick tool change mechanism, comprising a frame (1), a workbench (2) arranged on the frame (1), and a machining tool (3) located above the workbench (2), the machining tool (3) comprising a tool head (31) and a first power device (32) for driving the tool head (31) to rotate, characterized in that: The processing center also includes A tool magazine (4) is located on the side of the workbench (2) to provide a tool head for a tool broaching device (7), the tool magazine (4) comprising a tool disc (41) having a plurality of tool holders (42), a tool head (31) clamped on the tool holder (42), and a second power device (43) for driving the tool disc (41) to rotate forward and reverse so that an empty tool holder (42) or a replaced tool head faces the tool broaching device (7); A third power device (5) is used to drive the broaching device (7) to move rapidly in a horizontal direction to approach or move away from the tool magazine (4); A fourth power device (6) is used to drive the broaching device (7) to move rapidly in a vertical direction to approach or move away from the tool magazine (4); A broaching device (7) is arranged on the first power device (32) and is used for the fourth power device (6) to drive the broaching device (7) to move in a vertical direction to one of the cutting heads of the cutter disc (41) and then clamp the cutting head (31), and drive the broaching device (7) to move away from the cutter disc (41) by the third power device (5) so that the cutting head is separated from the cutter holder (42); and the third power device (5) drives the broaching device (7) to move in a horizontal direction to one of the vacant cutter holders (42) of the cutter disc (41) and then releases the cutting head (31) thereon and embeds it into the cutter holder (42), and drives the broaching device (7) to move away from the cutter disc (41) by the fourth power device (6) so that the cutting head is separated from the broaching device (7); The first power device (32) is a servo motor 1, the output shaft of which is arranged downward; the cutter head comprises a cutter head portion (311) and a shank portion (312) arranged on the cutter head portion (311); the broaching device (7) comprises a hollow sleeve (71) and a pull sleeve (72) located in the sleeve (71) and movably arranged along the length direction thereof; the sleeve (71) is arranged vertically, and its upper end is connected to the servo motor 1 via a transmission rod (73); the shank portion (312) of the cutter head can be embedded in the sleeve (71) along the vertical direction; a limiting portion (711) is arranged in the sleeve (71) for limiting the further upward movement of the shank portion (312) after the shank portion (312) is embedded in the sleeve (71) to a certain extent; a positioning groove (721) is provided at the lower end of the pull sleeve (72) for the shank portion (312) to be embedded; and an outer wall of the pull sleeve (72) is provided. A plurality of mounting holes (722) connected to the positioning groove (721) are provided on the upper surface, and the plurality of mounting holes (722) are evenly distributed in the circumferential direction. A ball (723) is arranged in the mounting hole (722) and is movably arranged in the axial direction thereof. After the shank portion (312) is embedded in the positioning groove (721), the ball (723) can move toward the inner side of the pull sleeve (72) and clamp the shank portion (312) under the guidance of the inner wall of the sleeve (71). An annular guide groove (712) is also provided on the inner wall of the sleeve (71) and is radially opened outward to provide space for the ball (723) to move toward the outer side of the pull sleeve (72) and to separate from the shank portion (312). The broaching device (7) also includes a driving member (74) for controlling the movement state of the pull sleeve (72) to clamp or release the shank portion (312) of the tool head. The driving member (74) comprises a pull rod (741), a spring (742), a connecting member (743), a transmission sleeve (744) and a reset swing arm (745). The pull rod (741) is arranged in the sleeve (71) along the vertical direction, and its lower end is fixed on the pull sleeve (72), and its upper end is connected to the connecting member (743). The transmission sleeve (744) is sleeved on the sleeve (71). A guide hole (713) leading to the connecting member (743) is opened on the outer wall of the sleeve (71). A connecting rod (746) is arranged on the side end of the connecting member (743) and is connected to the transmission sleeve (744) after extending out of the guide hole (713). A limiting ring (714) is fixed on the inner wall of the sleeve (71). The spring (742) is sleeved on the pull rod (741) and its upper end is pressed against The lower end of the connecting member (743) is pressed against the limiting ring (714) to drive the connecting member (743) to move upward, so that the connecting rod (746) thereon is pressed against the upper inner wall of the guide hole (713), the ball (723) on the pull rod (741) is disengaged from the annular guide groove (712), and the reset swing arm (745) is arranged on the transmission sleeve (744). The driving member (74) also includes a baffle (747) fixed on the frame (1) and located above the tool magazine (4) to guide the reset swing arm (745) to swing after the third power device (5) drives the broaching device (7) to move to the tool magazine (4), so that the transmission sleeve (744) moves downward and the ball (723) on the pulling sleeve (72) rolls into the annular guide groove (712).

2. A machining center with a multi-tool quick tool change mechanism according to claim 1, characterized in that: The multiple tool holders (42) are multiple buckles evenly distributed on the side wall of the tool disc (41) along the circumferential direction. The buckles are annular structures and have a certain elastic deformation ability. The side ends thereof have openings (421). When the buckles are pulled outward or squeezed inward, the openings (421) are enlarged or reduced.

3. A machining center with a multi-tool quick tool change mechanism according to claim 2, characterized in that: The handle portion (312) is provided with two parallel limiting flanges (3126), and there is a certain distance between the two limiting flanges (3126); the buckle is provided with a limiting flange (422) which is embedded in the gap between the two limiting flanges (3126) after the cutter head is clamped on the buckle in the horizontal direction.

4. A machining center with a multi-tool quick tool change mechanism according to claim 3, characterized in that: The frame (1) is provided with a crossbeam (11) which is located above the workbench (2) and is arranged transversely; the crossbeam (11) is provided with a first sliding seat (13) which is arranged to slide along its length direction; the third power device (5) is used to control the operating state of the first sliding seat (13); the first sliding seat (13) is also provided with a second sliding seat (16) which is arranged to slide along the vertical direction; the fourth power device (6) is used to control the operating state of the second sliding seat (16); the servo motor 1 is fixed on the first sliding seat (13); the sleeve (71) and the transmission rod (73) are arranged on the first sliding seat (13) so as to be rotatable in the circumferential direction.

5. A machining center with a multi-tool quick tool change mechanism according to claim 4, characterized in that: The second power device (43) is a servo motor 2 with an output shaft facing upward, and the cutter disc (41) is arranged on the output shaft of the servo motor 2; The crossbeam (11) is provided with two parallel first guide rails (12) arranged along the length direction thereof, the first sliding seat (13) is slidably arranged on the two first guide rails (12), the crossbeam (11) is further provided with a first ball screw (14) located between the two first guide rails (12), the nut seat on the first ball screw (14) is fixed on the first sliding seat (13), and the third power device (5) is a servo motor three whose output shaft is connected to the first ball screw (14); The first sliding seat (13) is provided with two second guide rails (15) arranged in a vertical direction, the second sliding seat (16) is slidably arranged on the two second guide rails (15), the first sliding seat (13) is also provided with a second ball screw (17) located between the two second guide rails (15), the nut seat on the second ball screw (17) is fixed on the second sliding seat (16), and the fourth power device (6) is a servo motor four whose output shaft is connected to the second ball screw (17).

6. A machining center with a multi-tool quick tool change mechanism according to claim 5, characterized in that: The frame (1) is provided with two third guide rails (18) arranged in the longitudinal direction, the workbench (2) is slidably arranged on the two second guide rails (15), a third ball screw (19) is also arranged between the two guide rails, and a nut seat on the third ball screw (19) is fixed on the workbench (2), and the machining center also includes a servo motor five (8) whose output shaft is connected to the third ball screw (19).

7. The machining center with a multi-tool quick tool change mechanism according to claim 1, characterized in that: The knife handle (312) comprises a handle body (3121) and a handle head (3122) located at the end of the handle body (3121); the handle body (3121) is in a truncated cone shape, and its outer diameter gradually decreases from the knife head (311) to the handle head (3122); the limiting portion (711) is a conical surface on the inner wall of the sleeve (71) and is matched with the outer wall of the handle body (3121); the handle head (3122) is in a cylindrical shape, and has an annular groove (3123) on its outer wall which is radially inwardly opened for the ball (723) to be embedded.

8. A machining center with a multi-tool quick tool change mechanism according to claim 7, characterized in that: A first guide surface (3124) having a certain slope is provided on the outer wall of the end of the handle (3122) for guiding the ball (723) to move toward the outside of the pull sleeve (72) when the pull sleeve (72) is driven downward; and a second guide surface (3125) having a certain slope is provided on the inner wall of the annular groove (3123) of the sleeve (71) near the end of the handle (3122) for guiding the ball (723) to move toward the outside of the pull sleeve (72) when the pull sleeve (72) is driven upward.

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