CN211804219U - Double-channel gear combined machining numerical control machine tool - Google Patents

Abstract

The numerical control machine tool has the advantages that the hobbing cutter frame and the turning cutter frame are respectively arranged on the first saddle and the second saddle, the two cutter frames are separately arranged and independently enter and retreat, the machine tool integrates the linear moving shafts of an X1 shaft, a Y1 shaft, a Z1 shaft, an X2 shaft, a Y2 shaft, a Z2 shaft and a W shaft and the rotating shafts of an A shaft, a B shaft, a C1 shaft and a C2 shaft, the double-channel control technology is fully utilized, the independent movement or the multi-shaft linkage of each shaft is controlled, the structure of the machine tool is compact, the space of a processing area is greatly saved, and the synchronous machining, the mixed machining and the overlapping machining are realized to finish the efficient and integrated machining of turning, milling, gear hobbing, gear milling or gear turning of parts such as gears, synchronous belt wheels, chain wheels, worm wheels, worms and the like, so that the machining form of the machine tool is diversified, and the practicability of the machine tool is improved.

Description

Double-channel gear combined machining numerical control machine tool

Technical Field

The utility model belongs to the technical field of the digit control machine tool, concretely relates to binary channels gear combined machining digit control machine tool.

Background

Machining of parts such as gears, synchronous pulleys, sprockets, worm gears and worms often requires turning, milling, hobbing, gear milling, gear turning and the like. Most of the traditional machining procedures are to perform turning machining firstly, then perform milling, then perform gear hobbing, or gear milling, or gear turning machining, need three or more traditional machining devices to complete machining, and need multiple procedures of turning, clamping and aligning for multiple times, so that the machining efficiency is low, and the machining procedures are not beneficial to mass, efficient and automatic production. There is therefore a need for improvements.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem: the utility model provides a binary channels gear combined machining digit control machine tool, the utility model discloses well main shaft and counter spindle can be used to the work piece location, it is rotatory, support and automatic tune, second saddle and second knife rest slide drive the turning knife rest and carry out lathe work to the work piece, first saddle and first knife rest slide and tilt angle mechanism drive the hobbing cutter frame and mill the tooth to the work piece, the hobbing, the facing work, this lathe make full use of binary channels control technique, each axle independent motion of control or multiaxis linkage, simultaneous processing has been realized, synchronous processing, hybrid processing, overlap processing, in order to accomplish the gear, synchronous pulley, the sprocket, the worm wheel, the turning of parts such as worm, mill, the hobbing, or mill the tooth, or the high efficiency of the facing, integrate processing, make the machine tool processing form diversified, improve the lathe practicality.

The utility model adopts the technical proposal that: the double-channel gear combined machining numerical control machine tool comprises a machine body, wherein a main shaft is arranged on the upper portion of the machine body, the main shaft is arranged at the left end of the upper portion of the machine body and rotates to form a C1 rotating shaft, a first saddle is arranged on a guide rail far away from an operator in the middle of the upper portion of the machine body, the first saddle moves on a track of the machine body along the Z1 axis direction, a first tool rest sliding plate capable of moving along the X1 axis direction is arranged on the guide rail of the first saddle, a swing angle mechanism is connected onto the first tool rest sliding plate, a hob rest capable of moving along the guide rail direction is arranged on the guide rail at the front end of the swing angle mechanism, the swing angle mechanism drives the hob rest to rotate around a rotating shaft parallel to the X1 axis direction to form; the middle of the upper portion of the lathe bed is provided with a second saddle which is arranged on a guide rail close to an operator, the second saddle moves on a lathe bed track along the Z2 axis direction, a second tool rest sliding plate which can move along the X2 axis direction is arranged on the guide rail of the second saddle, and a turning tool rest is connected onto the second tool rest sliding plate.

In a further limitation to the above technical solution, the turning tool post is connected to a second tool post slide plate through a second vertical slide plate, a vertical guide rail is arranged on a vertical surface of the second tool post slide plate, and the second vertical slide plate carries the turning tool post to move along a Y2 axis on the vertical guide rail of the second tool post slide plate; the turning tool rest adopts a turret tool rest or an arranged tool rest; the row-type tool rest comprises a tool clamp plate fixedly connected with the second tool rest sliding plate, a plurality of tool clamps are arranged on the tool clamp plate, and tools are fixed on the tool clamps.

In order to further limit the technical scheme, the swing angle mechanism is directly fixed on the first knife rest sliding plate; or a first vertical sliding plate is vertically arranged at the rear part of the swing angle mechanism, a vertical guide rail for mounting the first vertical sliding plate is arranged on the front surface of the first knife rest sliding plate, and the first vertical sliding plate is mounted on the vertical guide rail of the first knife rest sliding plate and can move up and down along the Y1 axis direction.

In a further limitation of the above technical scheme, the hob head comprises a front support, a hob bar, a rear support and a hob driving motor; the front support and the rear support are arranged on a guide rail at the front end of the swing angle mechanism, the cutter bar is arranged between the front support and the rear support, and the cutter bar is provided with a hobbing cutter or a forming milling cutter, a finger-shaped milling cutter and a tooth turning cutter; the hob driving motor is connected to the front support and drives the cutter bar and the cutter on the cutter bar to rotate by driving the main shaft in the front support; when the hob or the milling cutter, the finger-shaped milling cutter and the gear turning cutter are installed on the cutter bar, the axial space of the cutter bar is filled by adding the cutter pads with different thicknesses at the two ends of the cutter bar due to the length difference of different cutters.

The technical scheme is further limited, the swing angle mechanism comprises a swing angle box body, a worm wheel, a hand wheel, a swing angle rotating main shaft, a hob head connecting seat, a main ruler angle dial, an auxiliary ruler angle dial and an angle encoder; the worm and the worm wheel are orthogonally arranged in the swing angle box body, and a hand wheel or a servo motor which is connected with the worm to drive the worm to rotate is arranged outside the swing angle box body; the main ruler angle dial and the auxiliary ruler angle dial are respectively arranged on the swing angle box body and the hob holder connecting seat; the other end of the swing angle rotating main shaft penetrates through the swing angle box body and is fixedly connected with the angle encoder to feed back the actual angle of the hob head to an operator.

The technical scheme is further limited, a tail auxiliary mechanism is arranged at the upper part of the lathe bed, the tail auxiliary mechanism is coaxially opposite to the main shaft and is arranged at the right end of the upper part of the lathe bed, and the tail auxiliary mechanism can move on a lathe bed track along the W-axis direction through a driving structure; the tail auxiliary mechanism comprises an auxiliary main shaft or a tailstock; the auxiliary main shaft rotates to form a C2 revolving shaft; the tailstock comprises a tailstock body arranged on the lathe body and moving along the W-axis direction, a sleeve is arranged at the front end of the tailstock body, a top is arranged at the front end of the sleeve, and the top is a dead top or a live top.

In a further limitation of the above technical scheme, the bed body is of a flat bed body structure, and the first saddle and the second saddle are of a vertical saddle structure; or the lathe bed adopts a flat lathe bed structure, and the first saddle and the second saddle adopt an inclined saddle structure; or the lathe bed adopts an inclined lathe bed structure, and the first saddle and the second saddle adopt a flat saddle structure.

The utility model has the advantages compared with the prior art:

1. the main shaft and the auxiliary main shaft in the numerical control machine tool can be used for positioning, rotating, supporting and automatically turning a workpiece, the second saddle and the second tool rest sliding plate drive the turning tool rest to perform turning processing on the workpiece, the first saddle, the first tool rest sliding plate and the swing angle mechanism drive the hobbing tool rest to perform milling, hobbing and turning processing on the workpiece, and the numerical control machine tool structure integrates turning, hobbing, or gear milling or gear turning processing methods into a whole, so that the numerical control machine tool is convenient to adjust and operate, high in processing efficiency and good in processing quality, and is beneficial to large-batch, high-efficiency and automatic production;

2. in the scheme, the hob head is supported by the swing angle mechanism, and the swing angle mechanism can be rotated according to the helix angle of a workpiece and the helix angle requirement of the hobbing cutter, so that the hob head rotates to a correct position along with the swing angle mechanism, the angle processing requirement of the workpiece is met, and the hob head is more convenient to adjust and use;

3. according to the scheme, the hobbing cutter frame and the turning cutter frame are respectively arranged on the first saddle and the second saddle, the two cutter frames are separately arranged and independently feed and retract, and the X1 shaft, the Y1 shaft, the Z1 shaft, the X2 shaft, the Y2 shaft, the Z2 shaft, each linear moving shaft of the W shaft, each rotating shaft of the A shaft, the B shaft, the C1 shaft and the C2 shaft are integrated.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the middle-row tool rest of the present invention;

fig. 3 is a schematic structural view of the hob head of the present invention;

fig. 4 is a schematic structural view of the middle tail seat of the present invention;

fig. 5 is a schematic structural view of the swing angle mechanism of the present invention;

fig. 6 is a sectional view of the structure taken along the line a-a in fig. 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one.. said element does not exclude the presence of other like elements in the process, method, article or apparatus that comprises the element.

Referring to fig. 1-6, embodiments of the present invention are detailed.

Example 1: a double-channel gear compound machining numerical control machine tool comprises a machine body 1, a main shaft 2 is arranged at the upper part of the machine body 1, the main shaft 2 is arranged at the left end of the upper part of the machine body 1 and rotates to form a C1 rotating shaft, a first saddle 4 is arranged on a guide rail in the middle of the upper part of the machine body 1, which is far away from an operator, the first saddle 4 moves along the Z1 axis direction on the track of the bed 1, the guide rail of the first saddle 4 is provided with a first knife rest sliding plate 5 which can move along the X1 axis direction, the first tool rest sliding plate 5 is connected with a swing angle mechanism 7, a rolling tool rest 12 capable of moving along the direction of a guide rail is arranged on the guide rail at the front end of the swing angle mechanism 7, the swing angle mechanism 7 drives the hob head 12 to rotate around a rotating shaft parallel to the X1 shaft direction to form a rotating shaft A, the cutter on the hob head 12 rotates to form a rotating shaft B, to achieve a cutter fleeing movement and alignment of a certain tooth or a certain groove of the hob to the axis of the workpiece to be cut; the middle of the upper portion of the lathe bed 1 is provided with a second saddle 8 on a guide rail close to an operator, the second saddle 8 moves on a track of the lathe bed 1 along the Z2 axis direction, a second tool rest sliding plate 9 capable of moving along the X2 axis direction is arranged on the guide rail of the second saddle 8, and the second tool rest sliding plate 9 is connected with a turning tool rest 11. The movement of the first saddle 4 and the second saddle 8 on the track of the bed 1, the movement of the first tool rest sliding plate 5 on the first saddle 4, and the movement of the second tool rest sliding plate 9 on the second saddle 8 are driven by servo motors and lead screw structures, which are common technology in the machine tool and are not described in detail herein.

In this embodiment, the main shaft 2 and the auxiliary main shaft 31 are used for positioning, rotating, supporting and automatically turning a workpiece, the second saddle 8 and the second tool rest sliding plate 9 drive the turning tool rest 11 to perform turning on the workpiece, the first saddle 4, the first tool rest sliding plate 5 and the swing angle mechanism 7 drive the hobbing tool rest 12 to perform milling, hobbing and gear turning on the workpiece, and the numerical control machine structure integrates turning, hobbing, gear milling or gear turning methods into a whole, so that the numerical control machine is convenient to adjust and operate, high in processing efficiency and good in processing quality, and is beneficial to large-batch, high-efficiency and automatic production.

Example 2: the present embodiment is a further limitation on the specific structure and mounting structure of the turning tool holder 11: the turning tool rest 11 is connected with a second tool rest sliding plate 9 through a second vertical sliding plate 10, a vertical guide rail is arranged on the vertical surface of the second tool rest sliding plate 9, and the second vertical sliding plate 10 drives the turning tool rest 11 to move on the vertical guide rail of the second tool rest sliding plate 9 along the Y2 axis; the turning tool rest 11 adopts a turret tool rest 111 or an gang tool rest 112, and can be selected according to specific machined workpieces and working procedures in the machining process. As shown in fig. 2, the gang tool rest 112 includes a tool holder plate 1121 fixedly connected to the second tool rest slide plate 9, a plurality of tool holders 1122 are disposed on the tool holder plate 1121, and a tool 1123 is fixed on the tool holders 1122 to meet different machining requirements.

Example 3: the present embodiment is a further limitation on the fixing mode of the swing angle mechanism 7: the swing angle mechanism 7 is directly fixed on the first knife rest sliding plate 5; or, a first vertical sliding plate 6 is vertically arranged at the rear part of the swing angle mechanism 7, a vertical guide rail for mounting the first vertical sliding plate 6 is arranged on the front surface of the first tool rest sliding plate 5, the first vertical sliding plate 6 is mounted on the vertical guide rail of the first tool rest sliding plate 5 and can move up and down along the Y1 axis direction, and the movement of the first vertical sliding plate 6 on the first tool rest sliding plate 5 is driven by a servo motor and a lead screw structure, which is a common technology on a machine tool and therefore is not described in detail herein. The specific installation mode of the swing angle mechanism 7 is selected according to the situation.

As shown in fig. 5 and 6, the swing angle mechanism 7 includes a swing angle box 701, a worm 702, a worm wheel 703, a hand wheel 704, a swing angle rotating main shaft 705, a hob head coupling seat 706, a main scale angle dial 707, an auxiliary scale angle dial 708, and an angle encoder 709; the worm 702 and the worm wheel 703 are orthogonally arranged in the swing angle box body 701, and a hand wheel 704 or a servo motor which is connected with the worm 702 to drive the worm 702 to rotate is arranged outside the swing angle box body 701; the hob holder connecting seat 706 is arranged on one side of the pendulum angle box body 701, the pendulum angle rotating main shaft 705 fixedly penetrates through the worm gear 703, one end of the pendulum angle rotating main shaft is fixedly connected with the hob holder connecting seat 706, and the main scale angle dial 707 and the auxiliary scale angle dial 708 are respectively arranged on the pendulum angle box body 701 and the hob holder connecting seat 706; the other end of the swing angle rotating main shaft 705 penetrates through the swing angle box 701 and is fixedly connected with the angle encoder 709 for feeding back the actual angle of the hob head 12 to an operator.

Example 4: as shown in fig. 3, the hob head 12 comprises a front support 1201, a hob rod 1202, a rear support 1203, a hob cutter drive motor 1204; the front support 1201 and the rear support 1203 are installed on a guide rail at the front end of the swing angle mechanism 7, the cutter bar 1202 is installed between the front support 1201 and the rear support 1203, and cutters such as a hob 1205 or a forming milling cutter, a finger milling cutter, a tooth turning cutter and the like can be installed on the cutter bar 1202; the hob cutter driving motor 1204 is connected to the front support 1201 and drives the cutter bar 1202 and the hob cutter 1205 thereon to rotate by driving the main shaft in the front support 1201; when the hob 1205 or the cutter, the finger cutter, or the cutter with teeth is mounted on the cutter bar 1202, the axial space of the cutter bar 1202 is filled up by adding the cutter pads 1206 with different thicknesses at the two ends of the cutter bar 1202 due to the length difference of different cutters.

Example 5: on the basis of embodiments 1 to 4, as shown in fig. 1, a tail auxiliary mechanism 3 is disposed on the upper portion of the bed 1, the tail auxiliary mechanism 3 is disposed at the right end of the upper portion of the bed 1 coaxially opposite to the spindle 2, and the tail auxiliary mechanism 3 can move on the track of the bed 1 along the W-axis direction through a driving structure, so that a workpiece can be supported, and cutting rigidity can be improved. The structure in which the tail assist mechanism 3 is driven to move on the bed 1 in the W-axis direction is a servo motor and lead screw structure, which is a common technology in a machine tool and therefore is not described in detail herein. Specifically, the tail auxiliary mechanism 3 includes a sub-spindle 31 or a tailstock 32; the auxiliary main shaft 31 rotates to form a C2 revolving shaft; the tailstock 32 comprises a tailstock body 321 which is arranged on the lathe bed 1 and moves along the W-axis direction, as shown in fig. 4, a sleeve 322 is arranged at the front end of the tailstock body 321, a centre 323 is arranged at the front end of the sleeve 322, and the centre 323 adopts a dead centre or a live centre.

Example 6: the lathe bed 1 adopts a flat lathe bed structure, and the first saddle 4 and the second saddle 8 adopt a vertical saddle structure; or, the bed body 1 adopts a flat bed body structure, and the first saddle 4 and the second saddle 8 adopt an inclined saddle structure; or, the bed body 1 adopts an inclined bed body structure, and the first saddle 4 and the second saddle 8 adopt a flat saddle structure.

The structures listed in the embodiment can be freely combined and installed, so that the double-channel gear composite machining numerical control machine tool with different structural forms is formed, and the machining requirements of different gear parts are met.

According to the numerical control machine tool, the hob head 12 and the turning tool head 11 are respectively arranged on the first saddle 4 and the second saddle 8, the two tool heads are separately arranged and independently feed and retract, the machine tool integrates the rotating shafts of the X1 shaft, the Y1 shaft, the Z1 shaft, the X2 shaft, the Y2 shaft, the Z2 shaft, the linear moving shafts of the W shaft and the rotating shafts of the A shaft, the B shaft, the C1 shaft and the C2 shaft, a dual-channel control technology is fully utilized, and independent movement or multi-shaft linkage of each shaft is controlled, so that the machine tool is compact in structure, the space of a machining area is greatly saved, simultaneous machining, synchronous machining, mixed machining and overlapped machining are realized, and the turning, milling, hobbing, or gear milling or gear machining or high-efficiency and integrated machining of parts such as gears, synchronous belt wheels, chain wheels, worm wheels and the like are completed, the machining forms of the machine tool are diversified, and the practicability of.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. Double-channel gear combined machining digit control machine tool, including lathe bed (1), lathe bed (1) upper portion is equipped with main shaft (2), lathe bed (1) upper portion left end and its rotation formation C1 revolving axle, its characterized in that are located in main shaft (2): a guide rail far away from an operator in the middle of the upper part of the lathe bed (1) is provided with a first saddle (4), the first saddle (4) moves on a track of the lathe bed (1) along the Z1 axis direction, a guide rail of the first saddle (4) is provided with a first cutter frame sliding plate (5) capable of moving along the X1 axis direction, the first cutter frame sliding plate (5) is connected with a swing angle mechanism (7), a guide rail at the front end of the swing angle mechanism (7) is provided with a hob frame (12) capable of moving along the guide rail direction, the swing angle mechanism (7) drives the hob frame (12) to rotate around a rotating shaft parallel to the X1 axis direction to form an A rotating shaft, and a cutter on the hob frame (12) rotates to form a B rotating shaft; be equipped with second saddle (8) in the middle of lathe bed (1) upper portion near operator's the guide rail, second saddle (8) move along Z2 axle direction on lathe bed (1) track, be equipped with second knife rest slide (9) that can move along X2 axle direction on the guide rail of second saddle (8), be connected with turning knife rest (11) on second knife rest slide (9).

2. The dual-channel gear compound machining numerical control machine tool according to claim 1, characterized in that: the turning tool rest (11) is connected with a second tool rest sliding plate (9) through a second vertical sliding plate (10), a vertical guide rail is arranged on the vertical surface of the second tool rest sliding plate (9), and the second vertical sliding plate (10) drives the turning tool rest (11) to move along the Y2 axis on the vertical guide rail of the second tool rest sliding plate (9); the turning tool rest (11) adopts a turret tool rest (111) or an arranged tool rest (112); the row-type tool rest (112) comprises a tool clamping plate (1121) fixedly connected with a second tool rest sliding plate (9), a plurality of tool holders (1122) are arranged on the tool clamping plate (1121), and tools (1123) are fixed on the tool holders (1122).

3. The dual-channel gear compound machining numerical control machine tool according to claim 2, characterized in that: the swing angle mechanism (7) is directly fixed on the first knife rest sliding plate (5); or a first vertical sliding plate (6) is vertically arranged at the rear part of the swing angle mechanism (7), a vertical guide rail of the first vertical sliding plate (6) for installation is arranged on the front surface of the first knife rest sliding plate (5), and the first vertical sliding plate (6) is installed on the vertical guide rail of the first knife rest sliding plate (5) and can move up and down along the Y1 axis direction.

4. The dual channel gear compound machining numerical control machine tool of claim 3, characterized in that: the hob head (12) comprises a front support (1201), a hob rod (1202), a rear support (1203) and a hob cutter driving motor (1204); the front support (1201) and the rear support (1203) are arranged on a guide rail at the front end of the swing angle mechanism (7), the cutter bar (1202) is arranged between the front support (1201) and the rear support (1203), and the cutter bar (1202) is provided with a hobbing cutter (1205) or a forming milling cutter, a finger milling cutter and a gear turning cutter; the hob cutter driving motor (1204) is connected to the front support (1201) and drives the hob cutter (1202) and a cutter on the hob cutter driving motor to rotate through driving a main shaft in the front support (1201); when the hob cutter (1205) or the milling cutter, the finger cutter and the gear turning cutter are installed on the cutter bar (1202), the axial space of the cutter bar (1202) is filled up by adding tool pads (1206) with different thicknesses at two ends of the cutter bar (1202) due to the length difference of different cutters.

5. The dual channel gear compound machining numerical control machine tool of claim 3, characterized in that: the swing angle mechanism (7) comprises a swing angle box body (701), a worm (702), a worm wheel (703), a hand wheel (704), a swing angle rotating main shaft (705), a hob head connecting seat (706), a main scale angle dial (707), an auxiliary scale angle dial (708) and an angle encoder (709); the worm (702) and the worm wheel (703) are orthogonally arranged in the swing angle box body (701), and a hand wheel (704) or a servo motor which is connected with the worm (702) and drives the worm (702) to rotate is arranged outside the swing angle box body (701); the hob head connecting seat (706) is arranged on one side of the swing angle box body (701), the swing angle rotating main shaft (705) fixedly penetrates through a worm gear (703), one end of the swing angle rotating main shaft is fixedly connected with the hob head connecting seat (706), and the main scale angle dial (707) and the auxiliary scale angle dial (708) are respectively arranged on the swing angle box body (701) and the hob head connecting seat (706); the other end of the swing angle rotating main shaft (705) penetrates through the swing angle box body (701) and is fixedly connected with the angle encoder (709) so as to feed back the actual angle of the hob head (12) to an operator.

6. The dual channel gear compound machining numerical control machine tool according to claim 4 or 5, characterized in that: the upper part of the lathe bed (1) is provided with a tail auxiliary mechanism (3), the tail auxiliary mechanism (3) is coaxially opposite to the main shaft (2) and is arranged at the right end of the upper part of the lathe bed (1), and the tail auxiliary mechanism (3) can move on a track of the lathe bed (1) along the W-axis direction through a driving structure; the tail auxiliary mechanism (3) comprises a secondary main shaft (31) or a tailstock (32); the auxiliary main shaft (31) rotates to form a C2 revolving shaft; the tailstock (32) comprises a tailstock body (321) arranged on the lathe body (1) and moving along the W-axis direction, a sleeve (322) is arranged at the front end of the tailstock body (321), a tip (323) is arranged at the front end of the sleeve (322), and the tip (323) is a dead tip or a live tip.

7. The dual channel gear compound machining numerical control machine tool of claim 6, characterized in that: the lathe bed (1) adopts a flat lathe bed structure, and the first saddle (4) and the second saddle (8) adopt a vertical saddle structure; or the lathe bed (1) adopts a flat lathe bed structure, and the first saddle (4) and the second saddle (8) adopt an inclined saddle structure; or the lathe bed (1) adopts an inclined lathe bed structure, and the first saddle (4) and the second saddle (8) adopt a flat saddle structure.

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