A tool magazine expansion device for a CNC milling machine and a CNC machining center

Abstract

The utility model discloses a tool magazine expansion device for a numerically controlled milling machine and a numerically controlled machining center. The tool magazine expansion device for a numerically controlled milling machine includes an expansion tool magazine, a chip cover and a workbench. The expansion tool magazine includes a tool handle seat and an expansion tool magazine base. The tool handle seat is connected to the expansion tool magazine base. The expansion tool magazine and the chip cover are both fixedly connected to the workbench. The expansion tool magazine is arranged in the chip cover. The utility model solves the problems that the tool that cannot be installed in the tool magazine has to be placed on the workbench due to the limited tool magazine capacity of the machining center, and then the tool is manually changed when the parts are processed later, resulting in low tool change efficiency, easy errors, and easy damage to the tool, thereby improving the processing efficiency of the parts.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machining, and in particular relates to a tool magazine expansion device for a numerical control milling machine and a numerical control machining center. Background Art

[0002] The tool magazine capacity of a machining center is generally 16-32 tools, and automatic tool change can be completed during the machining process. In the CNC milling of complex structural parts such as shells, due to the complex structure of the parts and the large number of machining elements, dozens of milling tools are often used to process the surface and holes of the parts to meet the machining accuracy and design requirements of the parts. Most CNC milling machines are limited by the capacity of the tool magazine and cannot meet the number of tools required. Therefore, when machining parts, the tools that cannot be installed in the tool magazine are often stored on the workbench outside the CNC milling machine, and the tools that are used first in the machining process are installed in the CNC milling machine tool magazine. When it is necessary to use tools other than the tool magazine, stop the part machining program, manually pour out the tools in the CNC milling machine tool magazine, install the tools stored on the workbench in the CNC milling machine tool magazine, change the tool compensation parameters replaced in the CNC system, and then continue to run the part machining program. There are many problems with such operation: 1. When the tools that cannot be installed in the tool magazine of the CNC milling machine are stored on the workbench, the cutting edge of the tool is prone to collision and damage, causing losses; 2. Frequent pouring of tools in and out affects the smoothness of part processing and greatly reduces the efficiency of part processing; 3. Frequent pouring of tools in and out easily causes the tool to be placed incorrectly on the workbench and the tool to be installed incorrectly in the tool magazine of the CNC milling machine, causing overcutting or collision accidents of parts; 4. Frequent changes to the tool compensation parameters replaced in the CNC system easily lead to information input errors, causing overcutting or collision accidents of parts; 5. During the part processing process, chips and cutting fluid will splash onto the tools stored on the workbench. Over time, this will cause surface erosion of the tool. Summary of the invention

[0003] The utility model aims to provide a tool magazine expansion device for a CNC milling machine and a CNC machining center. The tool magazine expansion device for a CNC milling machine solves the problem of placing tools that cannot be installed in the tool magazine on a workbench due to the limited tool magazine capacity of the machining center, resulting in low tool change efficiency, easy errors, and easy damage to the tools, thereby improving the machining efficiency of parts.

[0004] The specific contents of the plan are as follows:

[0005] A tool magazine expansion device for a numerically controlled milling machine comprises an expanded tool magazine, a chip protection cover and a workbench. The expanded tool magazine comprises a tool handle seat and an expanded tool magazine base. The tool handle seat is connected to the expanded tool magazine base. The expanded tool magazine and the chip protection cover are both fixedly connected to the workbench. The expanded tool magazine is arranged in the chip protection cover.

[0006] The tool magazine expansion device of a CNC milling machine includes an expanded tool magazine, a chip cover and a workbench. The expanded tool magazine and the chip cover are fixed on the workbench by bolts. The chip cover surrounds the expanded tool magazine and ensures that when the CNC milling machine automatically changes tools, the chip cover door of the tool magazine opens, the spindle of the CNC milling machine descends into the chip cover, and the spindle of the CNC milling machine and the chip cover do not interfere with each other. When processing parts, the chip cover slides and unfolds to completely cover the top of the tool magazine chip cover enclosure, and the chip cover door of the tool magazine closes to prevent chips and cutting fluid from splashing onto the tools in the expanded tool magazine, which can not only avoid erosion and damage to the tools, but also prevent chips from falling onto the tool handle of the CNC milling machine and affecting the tool change operation. The bolts are inserted into the strip mounting holes of the expanded tool magazine base and fixed to the workbench threads, which solves the problem of placing tools that cannot be installed in the tool magazine on the workbench due to the limited capacity of the tool magazine of the machining center. Placing the tools in the expanded tool magazine can not only prevent tool damage, but also realize the function of automatic tool change, thereby improving the processing efficiency of parts.

[0007] Furthermore, the shank seat includes a shank seat body, an angle block and a spring limit assembly. The shank seat body is an open rectangular block with a semicircular missing portion in the middle area. The shank seat body is provided with a protruding side wall on one side parallel to the opening direction of the semicircular missing portion. The angle block is embedded in the upper end surface of the shank seat body and screwed and fixed. The angle block is located at the center of the arc of the semicircular missing portion, and the front end of the angle block is exposed outside the arc surface of the semicircular missing portion. The spring limit assembly is telescopically arranged on the side wall.

[0008] The tool handle seat includes a tool handle seat body, an angle clamp and a spring limit assembly. A semicircular missing portion is provided in the middle area of ​​the tool handle seat body, and a protruding side wall is provided on one side of the tool handle seat body parallel to the opening direction of the semicircular missing portion. The angle clamp is embedded in the upper end surface of the tool handle seat body corresponding to the arc midpoint of the semicircular missing portion, and the front end of the angle clamp is exposed outside the arc surface. The angle clamp matches the angle positioning groove on the CNC milling machine handle. The spring limit assembly is telescopically arranged on the side wall, and the spring limit assembly is perpendicular to the angle clamp. The angle clamp and the spring limit assembly clamp the CNC milling machine handle together.

[0009] Furthermore, the spring limiting assembly includes a spring, a spring block and a columnar slide, the two ends of the spring are respectively fixedly connected to the side wall and the spring block, the spring block is a cylinder with a blind hole, the columnar slide is arranged in the spiral channel of the spring and one end is fixedly connected to the side wall, and the spring block is matched and slidably sleeved on the columnar slide.

[0010] The spring limit assembly includes a spring, a spring block and a columnar slideway. One end of the spring is fixed to the side wall. The spring block is a cylinder with a blind hole at the tail end. The tail end of the spring block is fixedly connected to the other end of the spring. The columnar slideway is located in the spiral channel of the spring and one end is fixed to the side wall. The spring block is matched and slidably sleeved on the columnar slideway. The columnar slideway can be a cross slideway or a columnar slideway of other shapes. The top of the spring block can be a triangular block, or a rectangle or other shapes.

[0011] Furthermore, the hilt seat also includes a limiting strip, which is convexly arranged on the arc surface of the semicircular missing portion.

[0012] The spring limit assembly also includes a limit bar, which is a trapezoidal bar and convexly arranged on the arc surface of the semicircular missing part. The limit bar is matched and clamped in the positioning slot of the CNC milling machine handle to limit the up and down movement of the CNC milling machine handle.

[0013] Furthermore, the expanded tool magazine base is a rectangular parallelepiped, and two rows of semicircular open tool handle grooves are symmetrically provided on the upper end surface of the expanded tool magazine base. The arc parts of the two rows of tool handle grooves are arranged back to back and spaced apart, and the opening of each tool handle groove faces outward. The tool handle seat is matched and arranged on each tool handle groove and is threadedly fixed on the upper end surface of the expanded tool magazine base where the tool handle groove is located. The arc surface of the tool handle seat and the arc surface of the tool handle groove are consistent in direction and angle, and the number and size of the tool handle seats match the number and size of the tool handle grooves.

[0014] The expanded tool magazine base is a rectangular parallelepiped, and two rows of tool handle grooves are symmetrically arranged on its upper end surface. The arc parts of the tool handle grooves are arranged back to back and the opening of each tool handle groove is outward. The tool handle seat is matched and arranged on each tool handle groove, and the semicircular missing part of the tool handle seat is aligned with the semicircular opening of the tool handle groove, so that the direction and angle of the arc surface of the two openings are consistent. The tool handle seat is threadedly fixed on the upper end surface around the tool handle groove. The CNC milling machine tool handle is clamped in the tool handle groove by the angle clamp block, spring assembly and limit strip of the tool handle seat.

[0015] Furthermore, a positioning pin is provided at the center of the upper end surface of the expanded tool magazine base.

[0016] A positioning pin is provided at the center of the upper end surface of the expanded tool magazine base, which is used to set the expanded tool magazine base coordinate system and establish the positional relationship between the expanded tool magazine base and the CNC milling machine tool coordinate system.

[0017] Furthermore, a strip-shaped mounting hole is provided on the lower end surface of the expanded tool magazine base, and the expanded tool magazine base is fixedly connected to the workbench by bolts passing through the strip-shaped mounting hole.

[0018] Furthermore, the chip prevention cover includes a tool magazine chip prevention rolling door and a tool magazine chip prevention enclosure. The tool magazine chip prevention enclosure is a rectangular enclosure. The tool magazine chip prevention rolling door can be opened and closed and slidably connected to the top of the tool magazine chip prevention enclosure. The bottom of the tool magazine chip prevention enclosure is bolted to the workbench, and the tool magazine chip prevention enclosure is sleeved on the outside of the expanded tool magazine base.

[0019] The tool magazine chip guard is a rectangular guard, the bottom of which is fixedly connected to the workbench of the CNC milling machine by bolts, and the tool magazine chip guard rolling door can be opened and closed and slidably connected to the top of the tool magazine chip guard. When automatic tool change is not required, the tool magazine chip guard is in a closed state. When automatic tool change is required for processing, the tool magazine chip guard is opened, and the CNC milling machine spindle descends into the tool magazine chip guard for tool change. The tool magazine chip guard and the CNC milling machine spindle do not interfere with each other. The bottom of the tool magazine chip guard is fixed to the workbench by bolts. The tool magazine chip guard is sleeved on the outside of the expanded tool magazine base, that is, the tool magazine chip guard surrounds the expanded tool magazine base. When processing parts, the chip guard can prevent cutting and cutting fluid from splashing into the expanded tool magazine.

[0020] Furthermore, the tool magazine anti-chip rolling door includes a rectangular fixed frame, an anti-chip rolling curtain, a first rotating shaft, a second rotating shaft, a first transmission belt, a second transmission belt and a stepper motor. The first rotating shaft and the second rotating shaft are respectively fixedly connected to the opposite ends of the rectangular fixed frame. The anti-chip rolling curtain is a flexible rolling curtain. One end of the anti-chip rolling curtain is fixedly connected to the first rotating shaft and can be wound thereon. Connecting blocks are provided on the left and right sides of the other end of the anti-chip rolling curtain. The connecting blocks are respectively fixedly connected to the corresponding positions of the first transmission belt and the second transmission belt. The first transmission belt and the second transmission belt are both annular transmission belts. The first transmission belt is connected to the same side ends of the first rotating shaft and the second rotating shaft, and the second transmission belt is connected to the other same side ends of the first rotating shaft and the second rotating shaft. The first rotating shaft is transmission-connected to the stepper motor, and the stepper motor is fixedly connected to the rectangular fixed frame.

[0021] The anti-chip rolling curtain of the tool magazine anti-chip rolling door is a flexible rolling curtain, one end of which is fixed on the first rotating shaft and can be wound on the first rotating shaft. Connecting blocks are provided on the left and right sides of the other end of the anti-chip rolling curtain, and the connecting blocks are fixed on the corresponding positions of the first transmission belt and the second transmission belt. The first transmission belt and the second transmission belt are both annular transmission belts, the first transmission belt is connected to the same side end of the first rotating shaft and the second rotating shaft, and the second transmission belt is connected to the other same side end of the first rotating shaft and the second rotating shaft, forming a belt transmission connection, the first rotating shaft is transmission-connected to the stepper motor, and the stepper motor is fixedly connected to the rectangular fixed frame. The stepper motor provides power for the first rotating shaft, and the rotation of the first rotating shaft drives the first transmission belt, the second transmission belt, and the second rotating shaft to rotate, and the connecting block of the anti-chip rolling curtain moves with the first transmission belt and the second transmission belt. When the tool magazine anti-chip rolling door is opened, the anti-chip rolling curtain is wound on the first rotating shaft; when the tool magazine anti-chip rolling door is closed, the anti-chip rolling curtain slides and unfolds and covers the top of the tool magazine anti-chip enclosure.

[0022] A CNC machining center comprises a CNC milling machine tool magazine expansion device, wherein the angle clamping block of the CNC milling machine tool magazine expansion device matches the angle positioning groove on the CNC milling machine tool handle, the limit strip matches the positioning clamping groove of the CNC milling machine tool handle, and the spring clamping block can be elastically pressed against the CNC milling machine tool handle.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The tool magazine expansion device for a CNC milling machine of the utility model expands the tool magazine capacity, and solves the problem that tools that cannot be installed in the tool magazine of the machining center due to the limited capacity of the tool magazine of the machining center are placed on the workbench, and the tools are easily damaged.

[0025] 2. The tool magazine expansion device of the CNC milling machine of the utility model controls the movement of the CNC milling machine worktable and the clamping and releasing functions of the spindle through the CNC program, accurately locates the position of the tool holder seat, realizes the automatic tool changing function, improves the processing capacity of the machine tool, and avoids a series of problems such as low processing efficiency, collision and damage of the tool cutting edge, wrong placement and installation position, and incorrect input of tool parameters caused by manual tool reversing.

[0026] 3. The tool magazine expansion device of the CNC milling machine of the utility model can select a matching tool magazine expansion device according to the number of tools required for part processing and the size of the parts, and the installation and positioning of the tool magazine expansion device are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the tool magazine expansion device for a CNC milling machine of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a tool holder seat of a tool magazine expansion device for a CNC milling machine according to the utility model;

[0029] Figure 3 It is a structural schematic diagram of the expanded tool magazine of the tool magazine expansion device of the CNC milling machine of the utility model;

[0030] Figure 4 It is a schematic diagram of the belt transmission structure inside the tool magazine anti-chip rolling door of the tool magazine expansion device of the CNC milling machine of the utility model;

[0031] Figure 5 It is a schematic structural diagram of the tool holder of the tool magazine expansion device for a CNC milling machine of the utility model when the tool holder of the CNC milling machine is installed;

[0032] Figure 6 The diagram is a schematic diagram of automatic tool change in a CNC machining center equipped with a tool magazine expansion device for a CNC milling machine.

[0033] In the figure: 1. Expanded tool magazine; 2. Anti-chip cover; 21. Anti-chip rolling door of tool magazine; 211. Rectangular fixed frame; 212. Anti-chip rolling curtain; 2121. Connecting block; 213. First rotating shaft; 214.

[0034] The second rotating shaft; 215. The first transmission belt; 216. The second transmission belt; 217. The stepper motor; 22. The chip guard of the tool magazine; 3. The workbench; 4. The tool holder seat; 41. The tool holder seat body; 411. The semicircular missing part; 412. The side wall; 42. The angle block; 43. The spring limit assembly; 431. The spring; 432. The spring block; 433. The columnar slideway; 44. The limit strip; 5. The expansion tool magazine base; 51. The tool holder slot; 52. The strip mounting hole; 6. The positioning pin; 7. The CNC milling machine tool holder; 8. The CNC milling machine spindle. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0037] It should be noted that the directions or positional relationships indicated by the terms "front", "rear", "inside" and "outside" in the present invention are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0039] The embodiment provided by the utility model, that is, an embodiment of a tool magazine expansion device for a CNC milling machine and a CNC machining center, is described below in combination with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 Provide detailed explanation.

[0040] Embodiment 1:

[0041] A tool magazine expansion device for a CNC milling machine, see Figure 1 As shown, it includes an expanded tool magazine 1, a chip cover 2 and a workbench 3. The expanded tool magazine 1 includes a tool handle seat 4 and an expanded tool magazine base 5. The tool handle seat 4 is connected to the expanded tool magazine base 5. The expanded tool magazine 1 and the chip cover 2 are both fixedly connected to the workbench 3. The expanded tool magazine 1 is arranged in the chip cover 2.

[0042] See Figure 2 As shown, the shank seat 4 includes a shank seat body 41, an angle block 42 and a spring limit assembly 43. The shank seat body 41 is an open rectangular block with a semicircular missing portion 411 in the middle area. The shank seat body 41 is provided with a protruding side wall 412 on one side parallel to the opening direction of the semicircular missing portion 411. The angle block 42 is embedded in the upper end surface of the shank seat body 41 and screwed and fixed. The angle block 42 is located at the center of the arc of the semicircular missing portion 411, and the front end of the angle block 42 is exposed outside the arc surface of the semicircular missing portion 411. The spring limit assembly 43 is telescopically arranged on the side wall 412.

[0043] The spring limiting assembly 43 includes a spring 431, a spring block 432 and a columnar slide 433. The two ends of the spring 431 are fixedly connected to the side wall 412 and the spring block 432 respectively. The spring block 432 is a cylinder with a blind hole. The columnar slide 433 is arranged in the spiral channel of the spring 431 and one end is fixedly connected to the side wall 412. The spring block 432 is matched and slidably sleeved on the columnar slide 433.

[0044] The handle seat 4 further includes a limiting strip 44 , which is convexly disposed on the arc surface of the semicircular missing portion 411 .

[0045] See Figure 3 As shown, the expanded tool magazine base 5 is a rectangular parallelepiped, and two rows of semicircular open shank grooves 51 are symmetrically provided on the upper end surface of the expanded tool magazine base 5. The arc parts of the two rows of shank grooves 51 are arranged back to back and spaced apart, and the opening of each shank groove 51 faces outward. The shank seat 4 is matched and arranged on each shank groove 51 and is threadedly fixed on the upper end surface of the expanded tool magazine base 5 where the shank groove 51 is located. The arc surface of the shank seat 4 and the arc surface of the shank groove 51 are consistent in direction and angle, and the number and size of the shank seats 4 match the number and size of the shank grooves 51.

[0046] A positioning pin 6 is provided at the center of the upper end surface of the expanded tool magazine base 5 .

[0047] A strip-shaped mounting hole 52 is provided on the lower end surface of the expanded tool magazine base 5 , and the expanded tool magazine base 5 is fixedly connected to the workbench 3 via bolts passing through the strip-shaped mounting hole 52 .

[0048] See Figure 1 As shown, the chip protection cover 2 includes a tool magazine chip protection rolling door 21 and a tool magazine chip protection enclosure 22. The tool magazine chip protection enclosure 22 is a rectangular enclosure. The tool magazine chip protection rolling door 21 can be opened and closed and slidably connected to the top of the tool magazine chip protection enclosure 22. The bottom of the tool magazine chip protection enclosure 22 is bolted to the workbench 3. The tool magazine chip protection enclosure 22 is sleeved on the outside of the expanded tool magazine base 5.

[0049] See Figure 4 As shown, Figure 4 The schematic diagram of the structure of the tool magazine anti-chip rolling door without the rectangular fixed frame is used to more clearly show the internal structure of the tool magazine anti-chip rolling door. The tool magazine anti-chip rolling door 21 includes a rectangular fixed frame 211, an anti-chip rolling curtain 212, a first rotating shaft 213, a second rotating shaft 214, a first transmission belt 215, a second transmission belt 216 and a stepper motor 217. The first rotating shaft 213 and the second rotating shaft 214 are respectively fixedly connected to the opposite ends of the rectangular fixed frame 211. The anti-chip rolling curtain 212 is a flexible rolling curtain. One end of the anti-chip rolling curtain 212 is fixedly connected to the first rotating shaft 213 and can be wound thereon. A connecting block 2121 is provided on the left and right sides of the other end of the anti-chip roller shutter 212, and the connecting block 2121 is fixedly connected to the corresponding positions of the first transmission belt 215 and the second transmission belt 216 respectively. The first transmission belt 215 and the second transmission belt 216 are both annular transmission belts. The first transmission belt 215 is connected to the same side end of the first rotating shaft 213 and the second rotating shaft 214, and the second transmission belt 216 is connected to the other same side end of the first rotating shaft 213 and the second rotating shaft 214. The first rotating shaft 213 is transmission-connected to the stepper motor 217, and the stepper motor 217 is fixedly connected to the rectangular fixed frame 211.

[0050] The installation method of the tool magazine expansion device for a CNC milling machine and the operation method of the automatic tool changer of the utility model are as follows:

[0051] 1. Installation method:

[0052] 1) Select an expansion tool magazine base 5 of corresponding specifications according to the number of tools that cannot be placed in the tool magazine of the machining center and the tool size parameters, and select a matching tool holder seat 4 according to the model of the CNC milling machine tool holder 7;

[0053] 2) The tool holder seat 4 is installed on the expansion tool magazine base 5 by bolts. When the model of the CNC milling machine tool holder 7 is the same, the tool holder seat 4 does not need to be frequently disassembled;

[0054] 3) Install the expanded tool magazine base 5 with the tool handle seat 4 installed on the workbench 3 of the CNC milling machine by bolts, use a dial indicator to measure the side of the tool handle seat 4 on the expanded tool magazine base 5, and adjust the angle position of the expanded tool magazine base 5 so that the tool handle seat 4 is in a straight line along the coordinate axis direction of the CNC milling machine;

[0055] 4) Measure the positioning pin holes on the expanded tool magazine base 5, set the coordinate system of the expanded tool magazine base 5, and establish the positional relationship between the expanded tool magazine base 5 and the coordinate system of the CNC milling machine tool;

[0056] 5) The tool magazine anti-chip enclosure 22 is threadedly fixed on the workbench 3 and encloses the expanded tool magazine 1 therein, the tool magazine anti-chip rolling door 21 is opened and closed slidably connected to the top of the tool magazine anti-chip enclosure 22, the stepper motor 217 is set on the rectangular fixed frame 211 of the tool magazine anti-chip rolling door 21, the stepper motor 217 is transmission-connected to the first rotating shaft 213 of the tool magazine anti-chip rolling door 21, and the stepper motor 217 is electrically connected to the CNC system controller.

[0057] 2. Operation method of automatic tool change:

[0058] The CNC system controller issues an instruction to complete the automatic tool change action according to the program instruction. In the first step, the CNC system controller issues an instruction to return the CNC milling machine tool handle 7, and returns the CNC milling machine tool handle 7 on the CNC milling machine spindle 8 to its original position, so that the CNC milling machine spindle 8 remains empty and there is no CNC milling machine tool handle 7. If the CNC milling machine tool handle 7 on the CNC milling machine spindle 8 is from the tool magazine of the machining center, the instruction is executed to return the CNC milling machine tool handle 7 on the CNC milling machine spindle 8 to the tool magazine of the machining center; if the CNC milling machine tool handle 7 on the CNC milling machine spindle 8 is from the tool magazine expansion tool magazine 1, the corresponding instruction is executed to move the CNC milling machine spindle 8 to the pre-tool change position, so that the CNC milling machine tool handle 7 is placed on the limit strip 44 of the tool handle seat 4, the CNC milling machine spindle 8 releases the CNC milling machine tool handle clamping mechanism, and the CNC milling machine spindle 8 moves to the highest position, completing the action of returning the CNC milling machine tool handle 7 to the expansion tool magazine 1. In the second step, the CNC system controller issues a tool change command. The tool change path is programmed according to the specifications of the CNC milling machine tool handle 7, the size of the tool, and the position of the parts on the workbench 3 of the CNC milling machine. It is not limited to a fixed tool change path.

[0059] The tool changing action can be completed by simply ensuring that the pre-tool changing position and the tool changing position are correct.

[0060] Embodiment 2:

[0061] This embodiment also provides a CNC machining center. Figure 5 , Figure 6 As shown, Figure 6 The schematic diagram without the dust cover is intended to more clearly show the structure of the automatic tool changer of the CNC machining center. A CNC machining center, a CNC milling machine tool magazine expansion device, the angle clamp 42 of the CNC milling machine tool magazine expansion device matches the angle positioning groove on the CNC milling machine tool handle 7, the limit strip 44 matches the positioning groove of the CNC milling machine tool handle 7, and the spring clamp 432 can be elastically pressed against the CNC milling machine tool handle 7.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool magazine expansion device for a CNC milling machine, characterized in that: The invention comprises an expanded tool magazine (1), a chip protection cover (2) and a workbench (3); the expanded tool magazine (1) comprises a tool handle seat (4) and an expanded tool magazine base (5); the tool handle seat (4) is connected to the expanded tool magazine base (5); the expanded tool magazine (1) and the chip protection cover (2) are both fixedly connected to the workbench (3); and the expanded tool magazine (1) is arranged in the chip protection cover (2).

2. The tool magazine expansion device for a CNC milling machine according to claim 1, characterized in that: The shank seat (4) comprises a shank seat body (41), an angle clamping block (42) and a spring limiting assembly (43); the shank seat body (41) is an open rectangular block with a semicircular missing portion (411) in the middle area; the shank seat body (41) is provided with a protruding side wall (412) on one side parallel to the opening direction of the semicircular missing portion (411); the angle clamping block (42) is embedded in the upper end surface of the shank seat body (41) and screwed and fixed; the angle clamping block (42) is located at the center of the arc of the semicircular missing portion (411); the front end of the angle clamping block (42) is exposed outside the arc surface of the semicircular missing portion (411); and the spring limiting assembly (43) is telescopically arranged on the side wall (412).

3. The tool magazine expansion device for a CNC milling machine according to claim 2, characterized in that: The spring limiting assembly (43) comprises a spring (431), a spring block (432) and a columnar slideway (433); the two ends of the spring (431) are respectively fixedly connected to the side wall (412) and the spring block (432); the spring block (432) is a cylinder with a blind hole; the columnar slideway (433) is arranged in the spiral channel of the spring (431) and one end is fixedly connected to the side wall (412); the spring block (432) is matched and slidably sleeved on the columnar slideway (433).

4. The tool magazine expansion device for a CNC milling machine according to claim 3, characterized in that: The shank seat (4) further comprises a limiting strip (44), wherein the limiting strip (44) is protrudingly arranged on the arc surface of the semicircular missing portion (411).

5. The tool magazine expansion device for a CNC milling machine according to claim 4, characterized in that: The expanded tool magazine base (5) is a rectangular parallelepiped, and the upper end surface of the expanded tool magazine base (5) is symmetrically provided with two rows of semicircular open-type shank grooves (51), the arc parts of the two rows of shank grooves (51) are arranged back to back and spaced apart, and the opening of each shank groove (51) faces outwards, the shank seat (4) is matched and arranged on each shank groove (51) and is threadedly fixed on the upper end surface of the expanded tool magazine base (5) where the shank groove (51) is located, the arc surface of the shank seat (4) and the arc surface of the shank groove (51) are in the same direction and angle, and the number and size of the shank seats (4) match the number and size of the shank grooves (51).

6. The tool magazine expansion device for a CNC milling machine according to claim 5, characterized in that: A positioning pin (6) is provided at the center of the upper end surface of the expanded tool magazine base (5).

7. The tool magazine expansion device for a CNC milling machine according to claim 6, characterized in that: A strip-shaped mounting hole (52) is provided on the lower end surface of the expanded tool magazine base (5), and the expanded tool magazine base (5) is fixedly connected to the workbench (3) via bolts passing through the strip-shaped mounting hole (52).

8. The tool magazine expansion device for a CNC milling machine according to claim 7, characterized in that: The anti-chip cover (2) comprises a tool magazine anti-chip rolling door (21) and a tool magazine anti-chip enclosure (22); the tool magazine anti-chip enclosure (22) is a rectangular enclosure; the tool magazine anti-chip rolling door (21) can be opened and closed and slidably connected to the top of the tool magazine anti-chip enclosure (22); the bottom of the tool magazine anti-chip enclosure (22) is bolted to the workbench (3); and the tool magazine anti-chip enclosure (22) is sleeved on the outside of the expanded tool magazine base (5).

9. The tool magazine expansion device for a CNC milling machine according to claim 8, characterized in that: The tool magazine anti-chip rolling door (21) comprises a rectangular fixed frame (211), an anti-chip rolling curtain (212), a first rotating shaft (213), a second rotating shaft (214), a first transmission belt (215), a second transmission belt (216) and a stepping motor (217), wherein the first rotating shaft (213) and the second rotating shaft (214) are respectively fixedly connected to opposite ends of the rectangular fixed frame (211), and the anti-chip rolling curtain (212) is a flexible rolling curtain, one end of which is fixedly connected to the first rotating shaft (213) and can be wound thereon, and the left and right sides of the other end of the anti-chip rolling curtain (212) are provided with connecting blocks (212). 1), the connecting block (2121) is fixedly connected to the corresponding positions of the first transmission belt (215) and the second transmission belt (216), respectively. The first transmission belt (215) and the second transmission belt (216) are both annular transmission belts. The first transmission belt (215) is connected to the same side ends of the first rotating shaft (213) and the second rotating shaft (214), and the second transmission belt (216) is connected to the other same side ends of the first rotating shaft (213) and the second rotating shaft (214). The first rotating shaft (213) is transmission-connected to the stepping motor (217), and the stepping motor (217) is fixedly connected to the rectangular fixed frame (211).

10. A CNC machining center, characterized in that: It comprises a tool magazine expansion device for a CNC milling machine as described in any one of claims 1 to 9, wherein the angle clamp (42) of the tool magazine expansion device for a CNC milling machine matches the angle positioning groove on the tool handle (7) of the CNC milling machine, the limit strip (44) matches the positioning clamp groove of the tool handle (7) of the CNC milling machine, and the spring clamp (432) can be elastically pressed onto the tool handle (7) of the CNC milling machine.

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