A structure of a double-spindle CNC machine tool

Abstract

The present invention relates to the technical field of double-spindle machine tool equipment, and specifically provides a structure of a double-spindle numerical control machine tool; it includes a double-axis machine tool, and the double-axis machine tool includes a rotary machining table; a modular fixture for clamping a workpiece is detachably installed on the rotary machining table, and the modular fixture includes: a push-pull mechanism installed on the rotary machining table; two reference blocks arranged horizontally opposite to each other; the push-pull mechanism is connected between the two reference blocks for driving the two reference blocks to approach or move away synchronously; two groups of end blocks; a plurality of spare blocks; four side clamping components fixedly arranged on the four end blocks one by one; and a locking shaft group for locking the positions of the reference blocks, spare blocks and end blocks in the axial direction of the locking shaft group; in the present invention, the provided modular fixture improves the flexibility, applicability, versatility and economy of the fixture through modular design, and is especially suitable for double-spindle synchronous machining of workpieces with symmetrical structures.

Description

Technical Field

[0001] The invention relates to the technical field of dual-spindle machine tool equipment, and specifically proposes a dual-spindle numerically controlled machine tool structure. Background Art

[0002] A dual-spindle machine tool refers to a machine tool equipped with two spindles that can work independently or collaboratively. Various tools can be installed independently at the two spindle ends. Milling, drilling, boring and other processing operations can be performed simultaneously on the same machine tool, greatly improving production efficiency and processing accuracy.

[0003] A dual-spindle CNC machine tool refers to a type of dual-spindle machine tool with two main spindles that are coaxially symmetrically arranged. It is also suitable for simultaneous processing on both sides of a workpiece, and is especially suitable for processing workpieces with symmetrical structural features. The two symmetrically arranged main spindles of the machine tool can be used to perform the same or similar processing on both sides of the workpiece, thereby ensuring the consistency and accuracy of the processing dimensions and effectively improving the processing efficiency.

[0004] During the machining process of a dual-spindle CNC machine tool, the workpiece usually needs to be raised and secured by a fixture. Under the existing technology, a corresponding machining fixture is usually designed for each workpiece. A single fixture can only clamp the corresponding workpiece and is not applicable. In addition, when machining different workpieces, the corresponding machining fixture needs to be installed in conjunction with the machine tool, which has low flexibility.

[0005] In addition, some dual-spindle CNC machine tools will be equipped with support fixtures with adjustable spans on the processing table to flexibly cope with the processing of workpieces of different lengths. However, the support surface of this type of support fixture is fixed. When processing longer workpieces, the span adjustment is large, and the stability of the support clamping is greatly reduced, which will have an adverse effect on the workpiece processing accuracy. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a dual-spindle CNC machine tool structure to solve the problems mentioned in the above background technology.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A double-spindle CNC machine tool structure, including a double-axis machine tool, the double-axis machine tool includes a rotary machining table; a modular fixture for clamping workpieces is detachably installed on the rotary machining table, and the modular fixture includes: a push-pull mechanism installed on the rotary machining table; two reference blocks horizontally arranged opposite to each other and slidably installed on the rotary machining table; the push-pull mechanism is connected between the two reference blocks to drive the two reference blocks to approach or move away synchronously; two sets of end blocks corresponding to the two reference blocks; each set contains two end blocks, and the two end blocks in each set can be relatively assembled and docked at both ends of the reference block; a plurality of spare blocks that can be assembled individually or at least two of them can be spliced with each other and then assembled and docked between the reference block and the end block; four side clamping components are fixedly arranged on the four end blocks respectively and are arranged symmetrically in pairs; and a locking shaft group, the locking shaft group is divided into multiple sections respectively assembled on the reference block, the spare block and the end block, and the multiple sections of the locking shaft group are gradually docked with the assembly of the reference block, the spare block and the end block to form an integral rotating shaft structure; when the locking shaft group rotates to the locking position, the reference block, the spare block and the end block are locked in the axial position of the locking shaft group.

[0008] Preferably, the upper end faces of the reference block, the end block and the spare block in the assembled state are flush.

[0009] Preferably, the locking shaft group includes a first shaft section assembled on the reference block, a second shaft section assembled on the spare block, and a third shaft section assembled on the end block; the first shaft section can be docked with the second shaft section or the third shaft section, and the second shaft section can be docked with the second shaft section or the third shaft section.

[0010] Preferably, when the end block is assembled with the reference block, the spare block is assembled with the reference block, the spare block is assembled with the spare block, and the end block is assembled with the spare block, they are all in an insertion fit and overlapping state.

[0011] Preferably, lock blocks are fixed on both the second shaft section and the third shaft section; lock grooves corresponding to the lock blocks are provided on both the reference block and the spare block; when the end block, the spare block and the reference block are in the assembled state, the locking shaft group is rotated, and the lock blocks are inserted into the corresponding lock grooves with the rotation, and the end block and the spare block are locked in the axial position of the locking shaft group relative to the reference block.

[0012] Preferably, the side clamping component includes a side clamping plate that moves along the axial direction of the locking shaft group, and a sliding groove extending along the axial direction of the locking shaft group is commonly opened on the end block, the spare block and the reference block when in the assembled state, and the side clamping plate can slide along the sliding groove.

[0013] Preferably, a first shaft hole for internally assembling a first shaft section is horizontally and penetratingly formed in the reference assembly block, a second shaft hole for internally assembling a second shaft section is horizontally and penetratingly formed in the spare assembly block, and a third shaft hole for internally assembling a third shaft section is horizontally and penetratingly formed in the end assembly block.

[0014] Preferably, the pushing and pulling mechanism includes: a central guide rail detachably and positionally installed on the rotary processing table; two driving sliders relatively slidably arranged and installed on the central guide rail; and two groups of connecting rods correspondingly assembled on the two driving sliders; each group includes two connecting rods, and one ends of the two connecting rods in each group are symmetrically hinged to the driving slider, and the other ends of the two connecting rods are correspondingly hinged to the two reference assembly blocks.

[0015] Preferably, a positioning member is vertically slidably installed on the central guide rail, a positioning socket cooperating with the positioning member is arranged on the rotary processing table, and the positioning member is inserted into the positioning socket.

[0016] The above technical solution has the following advantages or beneficial effects: The present invention provides a double-spindle numerical control machine tool structure, which is provided with a modular fixture cooperating with the machine tool, and two support platforms both assembled by a reference assembly block, an end assembly block and a spare assembly block. A set of cooperating clamping side clamping assemblies are installed on a single support platform. In addition, a pushing and pulling mechanism with adjustable spacing span is assembled between the two support platforms. The lateral support width can be adjusted through the pushing and pulling mechanism, the longitudinal support width can be adjusted by selecting the number of assembled spare assembly blocks in a single support platform, and the assembled structure can be quickly integrally locked through the locking shaft group correspondingly arranged on the support platform, so as to clamp and fix workpieces with different width dimensions for processing. Moreover, as the assembled span extends, the support surface synchronously increases, ensuring the stability and rationality of processing support; in addition, the modular fixture can be used as a basic fixture, and more workpiece processing clamping requirements can be met by adding installation support accessories or clamping accessories; through modular design, the flexibility, applicability, versatility and economy of the fixture are improved, and it is especially suitable for double-spindle synchronous processing of workpieces with symmetrical structures. Description of the Drawings

[0017] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the present invention and its features, shape and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings, and the drawings are not deliberately drawn to scale, with the emphasis on showing the gist of the present invention.

[0018] Figure 1 is a three-dimensional structural schematic diagram of a double-spindle numerical control machine tool structure provided by the present invention.

[0019] Figure 2 is a three-dimensional structural diagram of the assembly of the modular fixture and the rotary processing table.

[0020] Figure 3 It is a three-dimensional structure diagram of the module fixture.

[0021] Figure 4 It is a three-dimensional structure diagram of the push-pull mechanism.

[0022] Figure 5 It is a three-dimensional sectional view of the positioning part assembled on the central guide rail.

[0023] Figure 6 It is a three-dimensional structure diagram of the reference patch.

[0024] Figure 7 It is a three-dimensional structure diagram of the spare patch.

[0025] Figure 8 It is a three-dimensional structure diagram of the end patch.

[0026] Figure 9 It is a three-dimensional sectional view of the locking shaft group for overall locking of the end patch, spare patch and reference patch in the assembled state.

[0027] Figure 10 It is a three-dimensional sectional view of the end patch, spare patch and reference patch in the assembled state.

[0028] Figure 11 It is a three-dimensional sectional view of the locking shaft group in the docking state.

[0029] In the figure: 1. Double-axis machine tool; 11. Machine tool base; 12. Rotary processing table; 13. Processing spindle; 2. Module fixture; 3. Push-pull mechanism; 31. Central guide rail; 311. Vertical guide groove; 312. Positioning part; 32. Pillow block bearing; 33. Bi-directional lead screw; 34. Driving slider; 35. Connecting rod; 4. Reference patch; 41. Assembly port; 42. First shaft hole; 43. First jack; 44. First locking groove; 45. Window hole; 5. Spare patch; 51. Assembly notch; 52. Second shaft hole; 53. First insertion rod; 54. Second jack; 55. Second locking groove; 6. End patch; 61. Third shaft hole; 62. Second insertion rod; 7. Locking shaft group; 71. First shaft section; 711. Rotating handle; 712. First pin; 72. Second shaft section; 721. First socket; 722. Second pin; 723. First locking block; 73. Third shaft section; 731. Second socket; 732. Second locking block; 8. Side clamping assembly; 81. Bearing bracket; 82. Driving screw; 83. Driven nut sleeve; 84. Side clamping plate. Specific implementation mode

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] To enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] As Figure 1 shown, a double-spindle numerical control machine tool structure includes a double-axis machine tool 1. The double-axis machine tool 1 includes a machine tool base 11, a rotary machining table 12, and two machining spindles 13. Two slide rails arranged horizontally and vertically are assembled on the machine tool base 11. The horizontal slide rail is discontinuously arranged, and the vertical slide rail passes through the discontinuous part of the horizontal slide rail. The rotary machining table 12 slides along the vertical slide rail. The two machining spindles 13 are arranged in coaxial symmetry, and the two machining spindles 13 slide along two sections of the horizontal slide rail in a one-to-one correspondence; it should be noted that the double-axis machine tool 1 is an existing machine tool structure, and its specific structure will not be described in detail. In the present invention, the double-axis machine tool 1 specifically refers to a butt double-axis machine tool.

[0033] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, a modular fixture 2 for clamping workpieces is detachably installed on the rotary machining table 12. In this embodiment, the workpiece to be machined specifically refers to a workpiece with symmetric structural features. The modular fixture 2 plays a role in clamping and fixing the workpiece, and also plays a role in raising the workpiece to form a machining avoidance for the two machining spindles 13; the modular fixture 2 includes a push-pull mechanism 3. The push-pull mechanism 3 includes a central guide rail 31. A plurality of T-shaped cross-section plug-in chutes are arranged on the table surface of the rotary machining table 12. The bottom end of the central guide rail 31 is provided with sliding feet that cooperate with the plug-in chutes. The central guide rail 31 is slidably inserted on the rotary machining table 12 through the sliding feet. A vertical guide groove 311 is centrally opened on the central guide rail 31. A positioning member 312 that cooperates with the rotary machining table 12 for positioning is assembled in the vertical guide groove 311. The positioning member 312 includes a slider that slidably cooperates with the vertical guide groove 311. A reverse U-shaped lifting rod is welded to the top end of the slider, and a positioning pin vertically passing through the central guide rail 31 is welded to the bottom end of the slider. A positioning socket that cooperates with the positioning pin is provided at the center of the table surface of the rotary machining table 12. The positioning pin is inserted into the positioning socket, and the central guide rail 31 is centrally arranged on the rotary machining table 12 through the positioning member 312.

[0034] As Figure 2 、 Figure 3 and Figure 4As shown in the figure, two reference splicing blocks 4 are detachably installed on the rotary processing table 12. The two reference splicing blocks 4 are symmetrically distributed on both sides of the push-pull mechanism 3. The reference splicing block 4 and the central guide rail 31 are both provided with sliding feet at the bottom end that cooperate with the insertion chute of the rotary processing table 12. The reference splicing block 4 is slidably installed on the rotary processing table 12 through the sliding feet; the push-pull mechanism 3 is connected between the two reference splicing blocks 4 and is used to drive the two reference splicing blocks 4 to approach or move away synchronously; the push-pull mechanism 3 further includes a pedestal bearing 32 fixed to the top end of the central guide rail 31 by bolts. The pedestal bearing 32 is centered directly above the vertical guide groove 311. A bidirectional lead screw 33 is horizontally rotatably installed on the pedestal bearing 32. Two driving sliders 34 symmetrically distributed on both sides of the pedestal bearing 32 are slidably installed on the central guide rail 31. The two driving sliders 34 are respectively threadedly installed on the two threaded sections of the bidirectional lead screw 33. For the convenience of rotation, wheels are fixedly installed at both ends of the bidirectional lead screw 33. Two connecting rods 35 are respectively hinged on the two driving sliders 34, and the other ends of the two connecting rods 35 are respectively hinged on the two reference splicing blocks 4.

[0035] Note: For the convenience of direction description, the following description of the orientation in the module fixture 2 is based on the insertion chute on the rotary processing table 12 being in the horizontal state.

[0036] As Figure 2 , Figure 3 and Figure 4 shown, in the present invention, the module fixture 2 is designed as a multi-module assembly combination. As the most basic form of the module fixture 2, end splicing blocks 6 are symmetrically assembled on both longitudinal ends of the two reference splicing blocks 4, and a side clamping assembly 8 is assembled on each end splicing block 6. In this embodiment, the two side clamping assemblies 8 arranged relative to the same reference splicing block 4 are symmetrically arranged; when the two end splicing blocks 6 are assembled at both ends of the reference splicing block 4, the upper end surfaces of the end splicing block 6 and the reference splicing block 4 are flush, and the reference splicing block 4 and the two assembled end splicing blocks 6 together form a support platform for workpiece processing support. In the present invention, there are two support platforms distributed on both sides of the push-pull mechanism 3. The span between the two support platforms constitutes the horizontal support width for workpiece processing support, and the span between the two side clamping assemblies 8 on the same support platform constitutes the longitudinal support width for workpiece processing support; when processing workpieces with different length and width dimensions, in order to make the workpiece support stable as much as possible and be able to cooperate to complete clamping and positioning on the premise of avoiding interference with the processing spindle 13, therefore, it is necessary to adjust the horizontal support width and the longitudinal support width correspondingly. For the adjustment of the horizontal support width, the span of the two support platforms can be adjusted through the push-pull mechanism 3. Specifically, by rotating the bidirectional lead screw 33 to drive the two driving sliders 34 to slide along the central guide rail 31, and then the driving sliders 34 drive the two support platforms to approach or move away relative to each other through the connecting rods 35, so as to realize the adjustment of the horizontal support width.

[0037] As Figure 2 and Figure 3 shown, for the longitudinal support width, in the present invention, a plurality of spare blocks 5 are also provided in cooperation. When the longitudinal support width of the support platform composed of only two end blocks 6 and the reference block 4 is not sufficient to cooperate with the two side clamping assemblies 8 to complete the clamping of the workpiece, one or more pairs of spare blocks 5 can be selected and assembled in the modular fixture 2. The two spare fixtures in each pair are assembled corresponding to each other at the two support platforms, and the assembly structures on the two support platforms are kept consistent. For a single support platform, when there is one spare block 5, it can be assembled between one end block 6 and the reference block 4; when there are two, they are assembled at both ends of the reference block 4; when there are three, one is assembled between one end block 6 and the reference block 4, and the other two are assembled together and then assembled as a whole between the other end block 6 and the reference block 4. Assembled according to this assembly method, the longitudinal support width between the two side clamping assemblies 8 is thus extended. It should be added that after assembly, the upper end surface of the spare block 5 is also flush with the upper end surface of the reference block 4.

[0038] In the support platform, with the intervention and assembly of the spare blocks 5, the clamping span between the two side clamping assemblies 8 is indirectly adjusted and extended. However, compared with the existing support fixtures with adjustable spans, with the assembly of the support platform, not only the support span is extended, but also the support area of the fixture is synchronously increased. For workpieces with a flat bottom end surface, such workpieces can be directly placed on the two support platforms. For workpieces with a non-integral flat bottom end surface, the modular fixture provided by the present invention can be used as a large support base. On the basis of the two support platforms, corresponding support positioning accessories can be additionally installed. The support positioning accessories can be directly pressed against the side walls of the support platforms by screws to adapt to the positioning and clamping of such workpieces, without designing a complete set of fixtures for such workpieces.

[0039] As Figure 6 , Figure 7 , Figure 8 and Figure 10As shown, in the present invention, when the end splicing block 6 is assembled with the reference splicing block 4, the spare splicing block 5 is assembled with the reference splicing block 4, the spare splicing block 5 is assembled with the spare splicing block 5, and the end splicing block 6 is assembled with the spare splicing block 5, they are all in a plug-in fit and overlapping state. Specifically, the reference splicing block 4 is symmetrically provided with assembly ports 41 in the form of cubic incisions at both longitudinal ends. The spare splicing block 5 is provided with assembly notches 51 having the same size as the assembly ends. Both the assembly ports 41 and the assembly notches 51 are formed with vertical cut surfaces and horizontal cut surfaces. The reference splicing block 4 is horizontally provided with a rectangular window hole 45 in the middle in the transverse direction. The reference splicing block 4 is horizontally penetrated with a first shaft hole 42 and two first jacks 43 between the two vertical cut surfaces. The first shaft hole 42 is arranged in the middle of the transverse width of the reference splicing block 4, and the two first jacks 43 are symmetrically arranged on both sides of the first shaft hole 42. The spare splicing block 5 is provided with a second shaft hole 52 and two second jacks 54 longitudinally on the vertical cut surface. The second shaft hole 52 is a through hole, and the second jack 54 is a blind hole. Two first plug rods 53 are horizontally welded on the side surface of the spare splicing block 5 opposite to the vertical cut surface. The two first plug rods 53 are arranged in one-to-one correspondence with the two second jacks 54. The end splicing block 6 is longitudinally penetrated with a third shaft hole 61, and two second plug rods 62 are horizontally welded on the side wall of the end splicing block 6.

[0040] When in the same support platform, between the end splicing block 6, the spare splicing block 5 and the reference splicing block 4 Figure 9 As shown in the assembly, the spare splicing block 5 is overlapped and assembled at the assembly port 41, and the first plug rod 53 is inserted into the corresponding first jack 43. The end splicing block 6 is overlapped and assembled at the assembly notch 51, and the second plug rod 62 is inserted into the corresponding second jack 54.

[0041] As Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, in the same support platform, in order to ensure the clamping stability of the two side clamping components 8 on the workpiece, a locking shaft group 7 for locking and fixing between the end splicing block 6, the spare splicing block 5 and the reference splicing block 4 is further provided in each support platform; the locking shaft group 7 is divided into a first shaft section 71 correspondingly and internally assembled in the first shaft hole 42 of the reference splicing block 4, a second shaft section 72 in the second shaft hole 52 of the spare splicing block 5, and a third shaft section 73 in the third shaft hole 61 of the end splicing block 6; the first shaft section 71 passes through the first shaft hole 42 and is rotatably arranged through two bearings, and the two bearings are embedded and fixed at both port positions of the first shaft hole 42. A turning handle 711 is fixed on the first shaft section 71, and the turning handle 711 is located in the window hole 45. Square-section first pins 712 are integrally formed at both ends of the first shaft section 71; for the convenience of assembly, both the spare splicing block 5 and the end splicing block 6 are in the form of Figure 10The shown half-assembled structure has the second shaft section 72 and the third shaft section 73 both rotatably arranged through bearings. After the second shaft section 72 is inserted into the second shaft hole 52, the two half-structures of the spare block 5 are assembled and locked. Similarly, after the third shaft section 73 is inserted into the third shaft hole 61, the two half-structures of the end block 6 are assembled and locked. At both ends of the second shaft hole 52, a first socket 721 and a second pin 722 are integrally formed respectively. At one end of the third shaft section 73, a second socket 731 is integrally formed. In addition, in order to achieve locking, first lock grooves 44 are opened on both horizontal cut surfaces of the reference block 4, a second lock groove 55 is opened on the horizontal cut surface of the spare block 5, a first lock block 723 is integrally formed on the second shaft section 72 at the first socket 721, and a second lock block 732 is integrally formed on the third shaft section 73 at the second socket 731. It should be noted that the structural dimensions of the first pin 712 and the second pin 722, the first socket 721 and the second slot, the first lock groove 44 and the second lock groove 55, and the first lock block 723 and the second lock block 732 are all the same. The first lock block 723 and the second lock block 732 are both in the shape of fan-shaped blocks; when as Figure 9 shown in the assembled state, the first shaft section 71, the second shaft section 72, and the third shaft section 73 are in a state of being inserted and matched section by section. Specifically, the first pin 712 is inserted into the first socket 721, and the second pin 722 is inserted into the second socket 731 to form an integral shaft structure. By manually rotating the first shaft section 71, the entire locking shaft group 7 rotates. The first lock block 723 is inserted into the first lock groove 44, and the second lock block 732 is inserted into the second lock groove 55. The end block 6 and the spare block 5 are both locked in the axial position of the locking shaft group 7 relative to the reference block 4.

[0042] As Figure 2 shown, the side clamping assembly 8 includes side clamping plates 84 that move axially along the locking shaft group 7. The end block 6, the spare block 5, and the reference block 4 are jointly provided with sliding grooves that extend axially along the locking shaft group 7 when in the assembled state. The side clamping plates 84 can slide along the sliding grooves. It also includes a bearing bracket 81 fixed to the side wall of the end block 6 by bolts. A driving screw 82 is horizontally rotatably installed on the bearing bracket 81. A driven nut 83 is threadedly engaged with the driving screw 82. One end of the driven nut 83 is welded to the side clamping plate 84. It should be noted that the side clamping plates 84 can be used as the basic components for side clamping positioning. For workpieces that can be directly clamped by the side clamping plates 84, direct clamping with the side clamping plates 84 can be used. For another part of the workpieces, when the side clamping surfaces of the side clamping plates 84 cannot form a clamping contact with the workpieces, similar to the support platform, based on the side clamping plates 84, corresponding side clamping positioning accessories can be fixedly installed on the side clamping plates 84 to meet the clamping requirements of such workpieces.

[0043] It should be added that the modular fixture provided in the present invention only plays a role in supporting, clamping and positioning the workpiece. In order to cooperate with the stable machining of the workpiece, a downward pressing and clamping mechanism such as a downward pressing block and a downward pressing rod can also be cooperatively installed and flexibly responded to according to the specific workpiece.

[0044] When machining the workpiece, according to the length and width dimensions of the workpiece to be machined, on the one hand, the span of the two support platforms is adjusted through the push-pull mechanism 3 to adjust the lateral support width, and on the other hand, the corresponding number of spare blocks 5 is selected and assembled to adjust the longitudinal support width; then the workpiece is placed in the middle of the two support platforms, and the workpiece is clamped and fixed by two groups of side clamping assemblies 8, so that the two sides to be machined of the workpiece face the two machining spindles 13 correspondingly. Finally, the workpiece is machined by the double-spindle machine tool 1.

[0045] The present invention provides a double-spindle numerical control machine tool structure, which is provided with a modular fixture 2 cooperating with the machine tool, and two support platforms both assembled by a reference block 4, an end block 6 and a spare block 5. And a set of side clamping assemblies 8 for cooperative clamping are cooperatively installed on a single support platform. In addition, a push-pull mechanism 3 with adjustable spacing span is assembled between the two support platforms. The lateral support width can be adjusted through the push-pull mechanism 3, and the longitudinal support width can be adjusted by selecting the assembly quantity of the spare blocks 5 in a single support platform. The assembled structure can be quickly integrally locked through the locking shaft group 7 correspondingly arranged on the support platform, so as to clamp and fix workpieces with different width dimensions for machining. And as the assembled span extends, the support surface synchronously increases, ensuring the stability and rationality of machining support; in addition, the modular fixture can be used as a basic fixture, and more workpiece machining and clamping requirements can be met by adding installation support accessories or clamping accessories; through modular design, the flexibility, applicability, generality and economy of the fixture are improved, and it is especially suitable for double-spindle synchronous machining of workpieces with symmetric structures.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0047] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0048] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A structure of a double-spindle numerical control machine tool, including a double-axis machine tool, the double-axis machine tool including a rotary machining table; characterized in that, A modular fixture for clamping a workpiece is detachably installed on a rotary processing table. The modular fixture includes: A push-pull mechanism installed on the rotary processing table; Two reference blocks horizontally arranged opposite to each other and slidably installed on the rotary processing table. The push-pull mechanism is connected between the two reference blocks to drive the two reference blocks to approach or move away from each other synchronously; Two sets of end blocks corresponding to the two reference blocks one by one. Each set includes two end blocks, and the two end blocks in each set can be assembled and butted against the two ends of the reference block relatively; A plurality of spare blocks that can be assembled singly or at least two of them can be spliced with each other and then assembled and butted between the reference block and the end block; Four side clamping components fixed to the four end blocks one by one and arranged symmetrically in pairs; And a locking shaft group. The locking shaft group is divided into multiple sections respectively assembled on the reference block, the spare block and the end block. The multiple sections of the locking shaft group are butted section by section as the reference block, the spare block and the end block are assembled to form an integral rotating shaft structure. When the locking shaft group rotates to the locking position, the reference block, the spare block and the end block are locked in the axial position of the locking shaft group; The locking shaft group includes a first shaft section assembled on the reference block, a second shaft section assembled on the spare block and a third shaft section assembled on the end block. Locking blocks are fixed on both the second shaft section and the third shaft section. Locking grooves corresponding to the locking blocks are provided on both the reference block and the spare block. When the end block, the spare block and the reference block are in the assembled state, rotate the locking shaft group, and the locking blocks are inserted into the corresponding locking grooves with the rotation, and the end block and the spare block are locked in the axial position of the locking shaft group relative to the reference block.

2. A double-spindle CNC machine tool structure according to claim 1, characterized in that: The upper end surfaces of the reference block, the end block and the spare block in the assembled state are flush.

3. A double-spindle CNC machine tool structure according to claim 1, characterized in that: The first shaft section can be butted with the second shaft section or the third shaft section, and the second shaft section can be butted with the second shaft section or the third shaft section.

4. A double-spindle CNC machine tool structure according to claim 1, characterized in that: When the end block is assembled with the reference block, the spare block is assembled with the reference block, the spare block is assembled with the spare block, and the end block is assembled with the spare block, they are all in an inserted and lapped state.

5. A double-spindle CNC machine tool structure according to claim 1, characterized in that: The side clamping component includes a side clamping plate that moves along the axial direction of the locking shaft group. A chute extending along the axial direction of the locking shaft group when in the assembled state is commonly provided on the end block, the spare block and the reference block, and the side clamping plate can slide along the chute.

6. A dual-spindle CNC machine tool structure according to claim 3, characterized in that: A first shaft hole for internally assembling the first shaft section is horizontally and penetratingly provided on the reference block, a second shaft hole for internally assembling the second shaft section is horizontally and penetratingly provided on the spare block, and a third shaft hole for internally assembling the third shaft section is horizontally and penetratingly provided on the end block.

7. A double-spindle CNC machine tool structure according to claim 1, characterized in that: The push-pull mechanism includes: A central guide rail detachably and positionally installed on the rotary processing table; Two driving sliders slidably arranged relative to each other on the central guide rail; And two sets of connecting rods correspondingly assembled on the two driving sliders. Each set includes two connecting rods, and one ends of the two connecting rods in each set are symmetrically hinged to the driving slider, and the other ends of the two connecting rods are correspondingly hinged to the two reference blocks.

8. A structure of a double-spindle CNC machine tool according to claim 7, characterized in that: A positioning member is vertically and slidably mounted on the central guide rail, and a positioning socket hole cooperating with the positioning member is provided on the rotary processing table, and the positioning member is inserted into the positioning socket hole.

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