Double-spindle machining center for large workpieces

Abstract

The invention discloses a large workpiece double-spindle machining center and relates to the technical field of automatic machining tools. The center framework comprises two bases which are oppositely arranged, the two bases are each provided with two stand columns, and a front door type structure and a rear door type structure which are formed by cross beams are erected on the stand columns on the same side of the two opposite bases; the three-axis mechanism is arranged on the central framework, is provided with a main shaft head and can move in the X-axis direction, the Y-axis direction and the Z-axis direction; the additional Y-axis mechanism is arranged on the inner sides of the lower portions of the two stand columns of the same base, and a clamp is assembled on the additional Y-axis mechanism. Two sets of chain type tool magazines and tool lifting devices are symmetrically arranged beside the stand columns at the upper parts of the two bases; and two sets of ATC tool changing manipulators are symmetrically arranged on the tool magazine brackets on the two bases. According to the technical scheme, the problems that in the prior art, gantry equipment is adopted for machining a large workpiece, one-time positioning multi-face machining is difficult to achieve, the tool changing time is long, and a spindle is needed for guiding a tool are solved.

Description

Technical Field

[0001] The invention discloses a large workpiece dual-spindle machining center, which relates to the technical field of automatic machining machine tools, and in particular to a large workpiece dual-spindle machining center. Background Art

[0002] As we all know, the machining centers in the current domestic machining industry are mainly suitable for machining medium and small parts. For large workpieces, such as the chassis, front and rear axles, and battery shells of new energy vehicles, they are limited by their large size and cannot be machined. The machining of large workpieces often needs to be carried out on gantry equipment, but most of them are single-spindle equipment, with relatively low machining efficiency. It is also not easy to combine with other machine tools into the production line due to its large footprint and other reasons.

[0003] In addition, the workpiece of the traditional gantry equipment is fixed and cannot be turned, rotated or moved. This makes it difficult to achieve multi-faceted processing of the workpiece at one time.

[0004] In the prior art, there are processing machines for large workpieces applied for by Weijie Co., Ltd. (publication numbers CN115464443A, CN114248157A, CN114248113A). However, there are problems such as the need for spindle tool guidance during tool change, long tool change time, and the workpiece fixture (holding table) being relatively fixed to the base, resulting in a limited structure.

[0005] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of large-scale workpiece dual-spindle machining center to overcome the problems existing in the prior art. Summary of the invention

[0006] According to the above-mentioned prior art, a dual-spindle machining center for large workpieces is provided, which solves the technical problems of using gantry equipment to process large workpieces, such as difficulty in achieving one-time positioning and multi-faceted machining, long tool change time, and the need for spindle tool guiding. The present invention provides a dual-spindle machining center for large workpieces. The present invention provides a dual-spindle machining center with a simple and compact structure, relatively low manufacturing cost, and safety and reliability, and the dual spindles are respectively equipped with corresponding chain tool magazines and ATC tool changing manipulators. The fixture falls on the A-axis turntable on both sides, and the turntable is located on the Y3 axis, which can realize multi-process machining of large workpieces (similar to small and medium-sized parts).

[0007] The technical means adopted by the present invention are as follows:

[0008] A large workpiece dual-spindle machining center includes: a center frame, a three-axis mechanism, an additional Y-axis mechanism, a chain tool magazine, a fixture, a spindle head, a tool lifting device and an ATC tool changing manipulator;

[0009] Furthermore, the central structure includes two bases arranged opposite to each other, two columns are arranged on the two bases respectively, and two front and rear gate structures are formed by beams on the columns on the same side of the two opposite bases;

[0010] Furthermore, a three-axis mechanism is arranged on the central frame, on which a spindle head is mounted, which can move along the X, Y and Z axes;

[0011] Further, an additional Y-axis mechanism is arranged on the lower inner side of two columns of the same base, and a clamp is mounted thereon;

[0012] Furthermore, two sets of chain tool magazines and tool lifting devices are symmetrically arranged beside the two upper columns of the base;

[0013] Furthermore, two sets of ATC tool changing manipulators are symmetrically arranged on the tool magazine brackets on the two bases.

[0014] Further, the three-axis mechanism includes: an X-axis slide, a Y-axis slide, a Z-axis slide and an X-axis guide rail;

[0015] Further, two X-axis guide rails are horizontally mounted on the inner sides of the two beams respectively;

[0016] Furthermore, two X-axis slides are arranged opposite to each other; the two X-axis slides are longitudinally straddled on the guide rails of two X-axis guide rails; the two X-axis slides are driven by two servo motors and ball screws, and can perform horizontal movement along the X-axis direction respectively;

[0017] Furthermore, two Y-axis slides are arranged opposite to each other and are respectively mounted on guide rails arranged longitudinally on the inner sides of the two X-axis slides; the two Y-axis slides are respectively driven by a servo motor and a ball screw and can respectively perform horizontal movement along the Y-axis direction;

[0018] Furthermore, two Z-axis slides are arranged opposite to each other and are respectively mounted on guide rails arranged vertically on the inner sides of the two Y-axis slides; the two Z-axis slides are respectively driven by two servo motors and ball screws and can move up and down along the Z-axis respectively;

[0019] Furthermore, a spindle head is installed at the lower end of the Z-axis slide, and the spindle head can rotate along the B-axis and the C-axis respectively.

[0020] Further, the additional Y-axis mechanism includes: a Y3-axis slide and an A-axis turntable;

[0021] Furthermore, two Y3-axis slides are symmetrically mounted longitudinally and horizontally on guide rails provided on the inner sides of the upper columns of the two bases; each Y3-axis slide is driven by a servo motor and a ball screw and can move horizontally along the Y-axis direction;

[0022] Furthermore, two A-axis turntables are symmetrically mounted above the two Y3-axis slides;

[0023] Furthermore, a fixture is installed between the two A-axis turntables, and the A-axis turntable can make the fixture and the workpiece perform horizontal rotational motion around the X-axis line.

[0024] Furthermore, a gap is left between the beam and the column.

[0025] Furthermore, the columns are provided with N upwardly tightened top bolts; the lower bottom surface of the crossbeam is supported on the N upwardly tightened top bolts;

[0026] Furthermore, the crossbeam is equipped with N downward pressing bolts to press the crossbeam against the supporting column;

[0027] Further, the top bolt is assembled on the support block;

[0028] Furthermore, the support block is arranged in a recess processed on the end face of the column, and can move forward, backward, left and right in the recess, ensuring that the upper bolt is accurately pressed against the tapered hole recess on the bottom surface of the beam.

[0029] Further, an intermediate excretion protection cover is provided between the two bases;

[0030] Further, the intermediate drain protection cover is located at the lower portion of the clamp.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The large-scale workpiece dual-spindle machining center provided by the present invention adopts a split base with a chip removal protective cover connected in the middle, so that the chips can be smoothly discharged to the lower water tank;

[0033] 2. The large-scale workpiece dual-spindle machining center provided by the present invention has two separate columns disposed above the base on both sides for supporting the upper crossbeam. This design facilitates the disassembly and transportation of the machine tool;

[0034] 3. The dual-spindle machining center for large workpieces provided by the present invention has a spindle head that can move along the X, Y, and Z axes respectively, and a tool that can also rotate along the B and C axes, which can effectively expand the machining range of the workpiece;

[0035] 4. The large workpiece dual-spindle machining center provided by the present invention has a structure in which the fixture can move along the Y-axis direction. Compared with the structure in which the fixture is fixed relative to the base, the former can effectively reduce the footprint of the machine tool, facilitate docking with the robot for automatic loading and unloading, and facilitate maintenance personnel to repair the fixture;

[0036] 5. The large-scale dual-spindle machining center provided by the present invention adopts a large-capacity chain tool magazine in the form of a tool magazine, and is equipped with a special tool lifting device and an ATC tool changing manipulator; the large-capacity tool magazine ensures that the machine tool can adapt to the multi-process processing of large workpieces, which can basically cover all processing contents. If the height of the factory building permits, the tool magazine can be expanded; the use of ATC greatly reduces the tool changing time of the machine tool, and one rotation of the tool changing manipulator can complete the storage of the preceding tool and the installation of the subsequent tool (to the spindle), thereby shortening the processing time of the workpiece. Beat; the more tools there are, the more time is saved; it avoids the time waste caused by the spindle tool guiding structure having to first return the tool on the spindle to the tool magazine, then the chain in the tool magazine rotates to call out the subsequent tool, and then guide the tool to the spindle; in order to monitor the damage of the tool, the present invention also includes a servo tool breakage monitoring device; after the tool is processed, it is put into the warehouse for inspection, and whether the tool is damaged can be found in time. If it is found to be damaged, an alarm will be issued immediately and the machine will be shut down to wait for manual processing, thereby avoiding further damage to the subsequent tool and the workpiece to be processed, and minimizing the loss;

[0037] 6. The large workpiece dual-spindle machining center provided by the present invention has two X-axis beams that fall on the two end columns respectively. Instead of using a face-to-face contact method, the beams are supported by a pressing method at several points, which facilitates the adjustment of the beam accuracy and can fine-tune the level of the beam;

[0038] 7. The large workpiece dual-spindle machining center provided by the present invention has the following three-axis drive features: the X-axis adopts a dual-drive lead screw structure, and the rear-end bearing is preloaded by a spring; the Y-axis adopts a lead screw single-drive structure, and the Z-axis adopts a dual-drive lead screw structure. The feature is that the feed speed is fast, which can effectively shorten the processing cycle.

[0039] In summary, the technical solution of the present invention solves the problems in the prior art of using gantry equipment to process large workpieces, difficulty in achieving multi-faceted processing at one time, long tool change time, and the need for spindle tool guiding. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 It is a schematic diagram of the structure of the present invention;

[0042] Figure 2 A top view of the present invention;

[0043] Figure 3 It is a top sectional view of the present invention;

[0044] Figure 4 It is a schematic diagram of the horizontal adjustment structure of the crossbeam of the present invention.

[0045] In the figure: 1, base 2, column 3, beam 4, chain tool magazine 5, intermediate discharge protective cover 6, fixture 7, X-axis slide 8, Y-axis slide 9, Z-axis slide 10, X-axis guide 11, Y3-axis slide 12, A-axis turntable 13, spindle head 14, tool lifting device 15, ATC tool changing robot 16, upper bolt 17, lower bolt 18, support block. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0053] As shown in the figure, the present invention provides a large-scale workpiece dual-spindle machining center including: a central structure, a three-axis mechanism, an additional Y-axis mechanism, a chain tool magazine 4, a fixture 6, a spindle head 13, a tool lifting device 14 and an ATC tool changing robot 15; the central structure includes two relatively arranged bases 1, two bases 1 are respectively provided with two columns 2, and two groups of front and rear gantry structures formed by a crossbeam 3 are set on the same-side columns 2 of the two relatively bases 1; the three-axis mechanism is arranged on the central structure, on which a spindle head 13 is installed, which can move along the X, Y and Z axes; the additional Y-axis mechanism is arranged on the lower inner side of the two columns 2 of the same base 1, on which a fixture 6 is installed; two sets of chain tool magazines 4 and tool lifting devices 14 are symmetrically arranged beside the upper columns 2 of the two bases 1; two sets of ATC tool changing robots 15 are symmetrically arranged on the tool magazine 4 brackets on the two bases 1.

[0054] The three-axis mechanism includes: an X-axis slide 7, a Y-axis slide 8, a Z-axis slide 9 and an X-axis guide rail 10; the two X-axis guide rails 10 are respectively installed horizontally on the inner sides of the two beams 3; the two X-axis slides 7 are arranged opposite to each other; the two X-axis slides 7 are longitudinally straddled on the guide rails of the two X-axis guide rails 10; the two X-axis slides 7 are driven by two servo motors and ball screws, and can move horizontally along the X-axis direction respectively; the two Y-axis slides 8 are arranged opposite to each other and are respectively installed on the opposite inner sides of the two X-axis slides 7 On the longitudinally arranged guide rail; the two Y-axis slides 8 are driven by a servo motor and a ball screw respectively, and can move horizontally along the Y-axis direction respectively; the two Z-axis slides 9 are arranged opposite to each other, and are respectively assembled on the guide rails arranged vertically on the inner sides of the two Y-axis slides 8; the two Z-axis slides 9 are driven by two servo motors and a ball screw respectively, and can move up and down along the Z-axis respectively; the spindle head 13 is installed at the lower end of the Z-axis slide 9, and the spindle head 13 can rotate along the B-axis and the C-axis respectively.

[0055] The additional Y-axis mechanism includes: a Y3-axis slide 11 and an A-axis turntable 12; the two Y3-axis slides 11 are symmetrically and horizontally mounted on the guide rails arranged on the inner sides of the columns 2 on the two bases 1; each Y3-axis slide 11 is driven by a servo motor and a ball screw, and can move horizontally along the Y-axis direction; the two A-axis turntables 12 are symmetrically installed above the two Y3-axis slides 11; a clamp 6 is installed between the two A-axis turntables 12, and the A-axis turntable 12 can make the clamp 6 carry the workpiece to perform horizontal rotation around the X-axis line.

[0056] There is a gap between the cross beam 3 and the column 2. The column 2 is provided with N upper bolts 16 that are tightened upward; the lower bottom surface of the cross beam 3 is supported by the N upper bolts 16 that are tightened upward; the cross beam 3 is equipped with N downward pressing bolts 17 that are pressed downward to press the cross beam 3 onto the supporting column 2; the upper bolts 16 are assembled on the support block 18; the support block 18 is set in the sinking groove machined on the end surface of the column 2, and can move forward, backward, left and right in the sinking groove to ensure that the upper bolts 16 are accurately pressed against the tapered hole sinking groove on the bottom surface of the cross beam 3.

[0057] After the horizontal accuracy of the crossbeam 3 is finely adjusted, the adjusted gasket can also be installed at the pressing bolt 17 to ensure the stability of the crossbeam.

[0058] An intermediate drainage protection cover 5 is arranged between the two bases 1 ; the intermediate drainage protection cover 5 is located at the lower part of the clamp 6 .

[0059] Finally, it should be noted that 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 they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-spindle machining center for large workpieces, characterized by: The large workpiece dual-spindle machining center comprises: a center frame, a three-axis mechanism, an additional Y-axis mechanism, a chain tool magazine (4), a fixture (6), a spindle head (13), a tool lifting device (14) and an ATC tool changing manipulator (15); The central framework comprises two bases (1) arranged opposite to each other, two columns (2) are arranged on the two bases (1) respectively, and two front and rear door-type structures are formed by cross beams (3) on the columns (2) on the same side of the two opposite bases (1); The three-axis mechanism is arranged on the central frame, on which a spindle head (13) is mounted, and can move along the X, Y and Z axes; The additional Y-axis mechanism is arranged on the inner side of the lower part of two columns (2) of the same base (1), and a clamp (6) is mounted thereon; Two sets of chain tool magazines (4) and tool lifting devices (14) are symmetrically arranged beside the upper columns (2) of the two bases (1); Two sets of ATC tool changing manipulators (15) are symmetrically arranged on the tool magazine (4) brackets on the two bases (1).

2. The large workpiece dual-spindle machining center according to claim 1, characterized in that: The three-axis mechanism comprises: an X-axis slide (7), a Y-axis slide (8), a Z-axis slide (9) and an X-axis guide rail (10); The two X-axis guide rails (10) are respectively installed horizontally on the inner sides of the two crossbeams (3); The two X-axis slides (7) are arranged opposite to each other; the two X-axis slides (7) are longitudinally straddled on the guide rails of the two X-axis guide rails (10); the two X-axis slides (7) are driven by two servo motors and ball screws, and can perform horizontal movement along the X-axis direction respectively; The two Y-axis slides (8) are arranged opposite to each other and are respectively mounted on guide rails arranged longitudinally on the inner sides of the two X-axis slides (7); the two Y-axis slides (8) are respectively driven by a servo motor and a ball screw and can respectively perform horizontal movement along the Y-axis direction; The two Z-axis slides (9) are arranged opposite to each other and are respectively mounted on guide rails arranged vertically on the inner sides of the two Y-axis slides (8); the two Z-axis slides (9) are respectively driven by two servo motors and ball screws and can respectively move in the up and down directions along the Z-axis; A spindle head (13) is installed at the lower end of the Z-axis slide (9), and the spindle head (13) can rotate along the B axis and the C axis respectively.

3. The large workpiece dual-spindle machining center according to claim 1, characterized in that: The additional Y-axis mechanism comprises: a Y3-axis slide table (11) and an A-axis turntable (12); The two Y3-axis slides (11) are symmetrically mounted longitudinally and horizontally on guide rails provided on the inner sides of the upper columns (2) of the two bases (1); each Y3-axis slide (11) is driven by a servo motor and a ball screw and can move horizontally along the Y-axis direction; The two A-axis turntables (12) are symmetrically mounted above the two Y3-axis slides (11); A fixture (6) is installed between the two A-axis turntables (12), and the A-axis turntable (12) can make the fixture (6) and the workpiece perform horizontal rotational motion around the X-axis line.

4. The large workpiece dual-spindle machining center according to claim 1, characterized in that: A gap is left between the cross beam (3) and the column (2).

5. The large workpiece dual-spindle machining center according to claim 1, characterized in that: The upright column (2) is provided with N upwardly tightened upper bolts (16); the lower bottom surface of the crossbeam (3) is supported on the N upwardly tightened upper bolts (16); The crossbeam (3) is equipped with N downward pressing bolts (17) to press the crossbeam (3) onto the supporting column (2); The upper bolt (16) is assembled on the support block (18); The support block (18) is arranged in a recess processed on the end face of the column (2) and can move forward, backward, left and right in the recess to ensure that the upper bolt (16) is accurately pressed against the tapered hole recess on the bottom face of the beam (3).

6. The large workpiece dual-spindle machining center according to claim 1, characterized in that: An intermediate excretion protection cover (5) is provided between the two bases (1); The intermediate discharge protection cover (5) is located at the lower part of the clamp (6).

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