A B-axis turntable structure

Abstract

The present invention discloses a B-axis turntable structure, which includes a Z-axis slide, a torque motor installed on the Z-axis slide, a flange connected to the output end of the torque motor, a code disc, a grating reader, a round cover and a chuck; the chuck is used to install a processing spindle and is fixedly connected to the round cover. The B-axis turntable structure is installed on a turning and milling compound machine tool. The B-axis turntable structure cleverly arranges the code disc and the grating reader in front of the torque motor by arranging a flange on the output end of the torque motor, and reasonably utilizes the space in the middle of the B-axis turntable, thereby greatly reducing the occupied space of the components behind the Z-axis slide, ensuring that the screw of the screw drive mechanism can be compactly arranged behind the torque motor without motion interference with the torque motor, and the screw nut of the screw drive mechanism is installed on the transmission joint. The screw drive mechanism drives the B-axis turntable structure to move in the up and down directions through the drive of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control equipment, and particularly relates to a B-axis turntable structure. Background Art

[0002] A turning-milling compound machine tool is a five-axis linkage machine tool mainly for turning, supplemented by milling, boring, drilling, tapping, etc. In a turning-milling compound machine tool, a clamping spindle for clamping a bar stock is generally provided, and the clamping spindle is parallel to the A-axis. In order to enable the machining spindle to complete machining and tool clamping operations at multiple angles, the machining spindle needs to be installed on a B-axis turntable, so that the spindle can swing around the B-axis. Subsequently, in order to enable the machining spindle to move vertically, the B-axis turntable is installed on a Z-axis slide table. A lead screw drive mechanism is provided on one side of the Z-axis slide table far from the B-axis turntable, and the lead screw drive mechanism drives the Z-axis slide table, the B-axis turntable on the Z-axis slide table, and the machining spindle to move vertically. The existing B-axis turntable generally installs a detection mechanism at its tail to measure the angular displacement of the B-axis turntable driving the machining spindle to swing. However, such a B-axis turntable structure will increase the length of the tail of the B-axis turntable, causing interference between the detection mechanism and the lead screw of the lead screw drive mechanism, which is not conducive to the compact design of the turning-milling compound machine tool.

[0003] It can be seen that the existing technology still needs to be improved. Summary of the Invention

[0004] In view of the deficiencies of the above-mentioned existing technology, the purpose of the present invention is to provide a B-axis turntable structure, aiming to install the detection mechanism in the middle of the B-axis turntable to avoid the excessive space occupied by the tail of the B-axis turntable structure and affect the compact design of the lead screw drive mechanism.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A B-axis turntable structure includes a Z-axis slide table, a torque motor, a flange, a code disk, a grating reader head, a round cover, and a chuck; the Z-axis slide table includes a slide plate portion with a through middle, a cylindrical portion protruding in front of the slide plate portion, and a transmission joint protruding behind the slide plate portion, and the transmission joint is used for fixedly connecting with a lead screw nut; the torque motor passes through the slide plate portion and is fixed on the cylindrical portion, the output end of the torque motor faces forward, one end face of the flange is in transmission connection with the output end of the torque motor, the code disk is sleeved on the flange, the grating reader head is fixed on the cylindrical portion and detects the scale on the code disk, the other end face of the flange is connected to the round cover by screws, the code disk is surrounded by the round cover, and the chuck is used for installing a machining spindle and is fixedly connected with the round cover.

[0007] As a further improvement of the above technical solution, an inner retaining ring is formed by protruding the front end of the cylindrical portion towards the inner cavity direction, and the head of the torque motor is connected to the inner retaining ring by screws.

[0008] As a further improvement of the above technical solution, the flange includes a flange body and a positioning outer ring disposed around the peripheral wall of the flange body. The code disc is sleeved on the flange body and abuts against the positioning outer ring, and the code disc is fixedly connected to the positioning outer ring.

[0009] As a further improvement of the above technical solution, the round cover includes a circular cover plate and a surrounding edge disposed behind the cover plate. The cover plate is screwed to the flange body, and the surrounding edge is disposed around the code disc.

[0010] As a further improvement of the above technical solution, the chuck includes a round connecting portion screwed to the round cover and a clamping portion for mounting a machining spindle. A positioning round groove connected to the round connecting portion is provided on the front end face of the cover plate.

[0011] As a further improvement of the above technical solution, the outer diameters of the round connecting portion of the chuck, the round cover, and the cylindrical portion of the Z-axis slide are all equal and are wrapped by a protective cylinder.

[0012] As a further improvement of the above technical solution, a slider mounting groove is provided at the corner of the rear end face of the slide plate portion.

[0013] As a further improvement of the above technical solution, one end of the transmission joint is integrally formed with the slide plate portion, and the other end forms two support claws. An installation opening is formed by the two support claws, and a plurality of threaded holes are provided on the upper end face of the support claws.

[0014] Beneficial effects:

[0015] Compared with the prior art, the B-axis turntable structure provided by the present invention cleverly arranges both the code disc and the grating read head in front of the torque motor by providing a flange on the output end of the torque motor, making reasonable use of the space in the middle of the B-axis turntable. Thus, the occupied space of the components behind the Z-axis slide is greatly reduced, ensuring that the lead screw of the lead screw drive mechanism can be compactly arranged behind the torque motor without movement interference with the torque motor. The lead screw nut of the lead screw drive mechanism is installed on the transmission joint, and the lead screw drive mechanism drives the B-axis turntable structure to move in the up and down directions through the drive of the motor. Description of the drawings

[0016] Figure 1 is a three-dimensional view of the turning-milling compound machine tool provided by the present invention Figure 1 。

[0017] Figure 2 is a three-dimensional view of the turning-milling compound machine tool provided by the present invention Figure 2 。

[0018] Figure 3 is Figure 2 a partial enlarged view of area A in

[0019] Figure 4 Internal structure schematic diagram of the B-axis turntable structure provided by the present invention.

[0020] Figure 5 Schematic diagram of the structure where the code disk is installed on the flange.

[0021] Figure 6 Stereogram of the Z-axis slide provided by the present invention.

[0022] Figure 7 Stereogram of the flange provided by the present invention.

[0023] Figure 8 Stereogram of the chuck provided by the present invention.

[0024] Explanation of main component symbols: 1-Z-axis slide, 2-torque motor, 3-flange, 4-code disk, 5-grating reader head, 51-bracket, 6-round cover, 7-chuck, 11-skateboard part, 12-cylindrical part, 13-drive joint, 131-supporting claw, 132-mounting port, 133-threaded hole, 14-inner retaining ring, 15-slider mounting groove, 31-flange main body, 32-positioning outer ring, 61-cover plate, 62-surrounding edge, 71-round joint head, 72-clamping part, 8-protection cylinder, 91-machining spindle, 92-clamping spindle, 93-X-axis lead screw drive mechanism, 94-Y-axis lead screw drive mechanism, 95-Z-axis lead screw drive mechanism, 96-bed body, 97-Y-axis slide, 98-X-axis slide, 102-lead screw nut, 971-guide rail, 972-slider. Detailed implementation manners

[0025] The present invention provides a B-axis turntable structure. To make the purpose, technical solution and effects of the present invention clearer and more definite, the following further details the present invention with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0026] In this article, the Y-axis direction is the front-back direction, the X-axis direction is the left-right direction, the Z-axis direction is the up-down direction, the direction of the B-axis turntable structure facing the clamping spindle 92 is the front, and "front" is opposite to "back".

[0027] Please refer to Figures 1-8, the present invention provides a B-axis turntable structure, including a Z-axis slide 1, a torque motor 2, a flange 3, a code disk 4, a grating head 5, a round cover 6 and a chuck 7; the Z-axis slide 1 includes a slide plate portion 11 with a through middle, a cylindrical portion 12 protruding in front of the slide plate portion 11, and a transmission joint 13 protruding behind the slide plate portion 11, and the transmission joint 13 is used for fixedly connecting with a lead screw nut 102; the torque motor 2 passes through the slide plate portion 11 and is fixed on the cylindrical portion 12, the output end of the torque motor 2 is arranged forward, one end face of the flange 3 is in transmission connection with the output end of the torque motor 2, the code disk 4 is sleeved on the flange 3, the grating head 5 is fixed on the cylindrical portion 12 through a bracket 51 and detects the scale on the code disk 4, the other end face of the flange 3 is screwed to the round cover 6, the code disk 4 is surrounded by the round cover 6, and the chuck 7 is used for installing a machining spindle 91 and is fixedly connected with the round cover 6.

[0028] In the actual assembly of a turning-milling compound machine tool, the assembly of the B-axis turntable structure needs to be completed first. As shown in Figure 4 , that is, first pass the head of the torque motor 2 through the slide plate portion 11 and fix it on the cylindrical portion 12, the tail of the torque motor 2 protrudes backward from the slide plate portion 11, then fix the rear end face of the flange 3 on the output end of the torque motor 2, sleeve the code disk 4 on the flange 3, install the grating head 5 on the cylindrical portion 12, so that the grating head 5 detects the scale on the code disk 4 and feeds back a signal to the control system, and the control system accurately measures the angular displacement of the B-axis turntable driving the machining spindle 91 to swing after signal processing. Then install the round cover 6 on the front end face of the flange 3, the peripheral edge 62 of the round cover 6 surrounds the outer periphery of the code disk 4 but does not contact the cylindrical portion 12, and the peripheral edge 62 of the round cover plays a dust-proof protection role for the code disk 4. Then the chuck 7 is screwed to the round cover 6, and the machining spindle is installed on the chuck 7, and the overall assembly of the B-axis turntable is successfully completed. Finally, the Z-axis slide 1 is slidably arranged on the Y-axis slide 97. There are two vertically extending guide rails 971 on the Y-axis slide 97. A slider installation groove 15 is provided at the corner of the rear end face of the slide plate portion 11. A slider 972 is fixedly provided in each slider installation groove 15, and each slider 972 is slidably connected to the corresponding guide rail 971, so that the Z-axis slide 1 can move vertically smoothly.

[0029] Compared with the prior art, in the B-axis turntable structure provided by the present invention, by arranging a flange plate 3 at the output end of the torque motor 2, the code disk 4 and the grating head 5 are cleverly arranged in front of the torque motor 2, reasonably utilizing the space in the middle of the B-axis turntable, thereby greatly reducing the occupied space of the components behind the Z-axis slide 1, ensuring that the lead screw 101 of the lead screw drive mechanism can be compactly arranged behind the torque motor 2 without movement interference with the torque motor 2. The lead screw nut 102 of the lead screw drive mechanism is installed on the transmission joint 13. Driven by the motor, the lead screw drive mechanism drives the B-axis turntable structure to move in the up and down direction.

[0030] The working principle of the B-axis turntable structure is briefly described as follows: The torque motor provides a powerful rotational torque, driving the flange plate 3, the code disk 4, the round cover 6, the chuck 7, and the machining spindle 91 to rotate synchronously around the B-axis (i.e., Figure 4 the extension direction of the dashed line in the figure), enabling the machining spindle to swing flexibly according to the actual cutting conditions, forming a multi-angle machining effect. When the machining spindle changes tools, the torque motor drives the machining spindle to swing from the vertical state to the horizontal state to cooperate with the tool magazine for automatic tool change.

[0031] It should be understood that if the tail of the torque motor occupies too much space, causing the Z-axis lead screw drive mechanism 95 to need to move backward as a whole, it will cause the Z-axis lead screw drive mechanism 95 to be located in the middle of the Y-axis slide 97, thereby hindering the staff from performing assembly operations inside the Y-axis slide 97. In addition, since the Z-axis lead screw drive mechanism 95 needs to move backward as a whole, the length of the Y-axis slide 97 in the front and back directions increases, thus affecting the sliding distance of the Y-axis slide 97. Moreover, it will also cause the mounting port 132 of the transmission joint 13 to be very far from the slide plate portion, affecting the smoothness of the Z-axis lead screw drive mechanism 95 driving the Z-axis slide 1 to move vertically.

[0032] Specifically, as shown in Figure 6 , a front end of the cylindrical portion 12 protrudes towards the inner cavity to form an inner retaining ring 14. A step 121 adapted to the outer shell of the torque motor 2 is provided on the inner wall of the cylindrical portion 12. The torque motor 2 forms axial positioning through the limitation of the step and the inner retaining ring 14. A plurality of mounting through holes 122 are provided on the inner retaining ring 14, and screws are arranged on each mounting through hole. The head of the torque motor 2 is fixedly connected to the inner retaining ring 14 through the screws, thereby completing the circumferential positioning of the torque motor 2. The output end of the torque motor 2 passes through the middle of the inner retaining ring 14.

[0033] Specifically, as shown in Figure 4 and Figure 7As shown, the flange 3 includes a flange body 31 and a positioning outer ring 32 provided around the peripheral wall of the flange body 31. The flange body 31 and the positioning outer ring 32 are integrally formed. The code disk 4 is sleeved on the flange body 31 and abuts against the positioning outer ring 32, so that the axial positioning of the code disk 4 is realized. The code disk 4 is connected to the positioning outer ring 32 by screws, so that the code disk 4 can rotate following the flange 3.

[0034] Further, the round cover 6 includes a circular cover plate 61 and a peripheral edge 62 provided behind the cover plate 61. The rear end face of the cover plate 61 is connected to the flange body 31 by screws. The peripheral edge 62 is arranged outside the code disk 4, and the peripheral edge plays a role in dust prevention and protection for the code disk.

[0035] Specifically, please refer to Figure 8 , the chuck 7 includes a round connection part 71 connected to the round cover 6 by screws and a clamping part 72 for installing a machining spindle. A positioning circular groove is provided on the front end face of the cover plate 61. The axial positioning of the chuck 7 is realized by the cooperation connection between the positioning circular groove and the round connection part 71, ensuring the coaxiality of the chuck 7 and the torque motor 2, reducing the assembly deviation, and improving the machining accuracy. The clamping part 72 is a hollow structure, and the machining spindle 91 passes through the clamping part 72 and is flange-connected to the bottom of the clamping part 72.

[0036] Further, as shown in Figure 4 , the outer diameters of the round connection part 71 of the chuck 7, the round cover 6, and the cylindrical part 12 of the Z-axis slide 1 are all equal and are wrapped by a protective cylinder 8. Since there is a clearance for avoidance between the round cover 6 and the cylindrical part 12, and there is a connection clearance between the round connection part 71 and the round cover 6, by completely wrapping the round connection part 71, the round cover 6, and the cylindrical part 12 with the protective cylinder 8, on the one hand, the B-axis turntable structure can be made more beautiful and durable, and on the other hand, the protective cylinder 8 can better prevent oil and dust from penetrating into the inside of the B-axis turntable structure and affecting the detection effect of the code disk 4 and the grating read head 5.

[0037] Preferably, please refer to Figure 6 , the transmission joint 13 is arranged on the top of the slide plate part 11. One end of the transmission joint 13 is integrally formed with the slide plate part 11, and the other end forms two support claws 131. The two support claws 131 enclose an installation opening 132. A lead screw nut 102 is installed in the installation opening 132. Threaded holes 133 are provided on the upper end faces of the support claws 131, and the lead screw nut 102 is fixed to the transmission joint 13 by the cooperation of screws and the threaded holes 133.

[0038] See Figure 1 and Figure 2As shown, the present invention also provides a turning-milling compound machine tool, including a bed 96, an X-axis slide 98 slidably arranged on the bed 96, an X-axis screw drive mechanism 93 for driving the X-axis slide 98 to move in the left-right direction, a Y-axis slide 97 slidably arranged on the X-axis slide 98, a Y-axis screw drive mechanism 94 for driving the Y-axis slide 97 to move in the front-back direction, a B-axis turntable structure of any of the above embodiments or any combination of the above embodiments, and a Z-axis screw drive mechanism 95 for driving the Z-axis slide 1 to move up and down; the Z-axis slide 1 is slidably arranged on the Y-axis slide 97, the chuck 7 is provided with a machining spindle 91, the machining spindle 91 is clamped with a tool, and the bed 96 is provided with a clamping spindle 92 extending in the left-right direction.

[0039] If a turning process is performed, the clamping spindle 92 drives the workpiece (such as a bar) to rotate, and then the tool is adjusted by the XYL three-axis moving feed method and the angular displacement of the tool relative to the B axis to turn the workpiece. If a milling process is performed, the clamping spindle 92 only fixes the workpiece, and then the machining spindle 91 drives the tool to rotate at high speed to mill the stationary workpiece. The X-axis drive mechanism, the Y-axis drive mechanism, and the Z-axis drive mechanism all include a motor, a screw rod connected to the output end of the motor, and a screw rod nut sleeved on the screw rod.

[0040] Since the B-axis turntable structure has been described above, those skilled in the art should be able to understand it in conjunction with the accompanying drawings, so the B-axis turntable structure will not be described in detail here.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It is understood that those of ordinary skill in the art can make equivalent substitutions or changes according to the technical solution of the present invention and its inventive concept, and all such changes or substitutions shall fall within the protection scope of the present invention.

Claims

1. A B-axis turntable structure, characterized in that, It includes a Z-axis slide, a torque motor, a flange, a code disk, a grating read head, a round cover and a chuck; the Z-axis slide includes a slide plate part with a through middle part, a cylindrical part protruding in front of the slide plate part and a transmission joint protruding behind the slide plate part, and the transmission joint is used for fixedly connecting with a lead screw nut; the torque motor passes through the slide plate part and is fixed on the cylindrical part, the output end of the torque motor is arranged forward, one end face of the flange is in transmission connection with the output end of the torque motor, the code disk is sleeved on the flange, the grating read head is fixed on the cylindrical part and detects the scale on the code disk, the other end face of the flange is connected with the round cover by screws, the code disk is surrounded by the round cover, and the chuck is used for installing a machining spindle and is fixedly connected with the round cover; the front end of the cylindrical part protrudes towards the inner cavity to form an inner retaining ring, and the head of the torque motor is connected with the inner retaining ring by screws; the flange includes a flange main body and a positioning outer ring arranged around the circumferential wall of the flange main body, the code disk is sleeved on the flange main body and abuts against the positioning outer ring, and the code disk is fixedly connected with the positioning outer ring; the round cover includes a circular cover plate and a surrounding edge arranged behind the cover plate, the cover plate is connected with the flange main body by screws, and the surrounding edge is arranged on the periphery of the code disk; a slider mounting groove is provided at the corner of the rear end face of the slide plate part; one end of the transmission joint is integrally formed with the slide plate part, and the other end forms two support claws, the two support claws enclose an installation opening, and a plurality of threaded holes are provided on the upper end face of the support claws.

2. The B-axis turntable structure according to claim 1, characterized in that, The chuck includes a round connection part connected with the round cover by screws and a clamping part for installing a machining spindle, and a positioning round groove connected with the round connection part is provided on the front end face of the cover plate.

3. The B-axis turntable structure according to claim 2, characterized in that, The outer diameters of the round connection part of the chuck, the round cover and the cylindrical part of the Z-axis slide are equal and are wrapped by a protection cylinder.

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