Lathe body casting of high-precision numerical control lathe

Abstract

The invention discloses a lathe bed casting of a high-precision numerical control lathe, and relates to the technical field of metal casting. The invention provides a high-precision numerical control lathe body casting which comprises a bottom plate, symmetrically arranged telescopic rods are fixedly connected to the bottom plate, a sand box is fixedly connected between the telescopic ends of the symmetrically arranged telescopic rods, a base plate is fixedly connected to the bottom in the sand box, an evanescent mode is placed on the base plate, and transversely symmetrical guide rods are fixedly connected to the sand box. Sliding blocks are connected to the guide rods in a sliding mode, and a pressing plate is fixedly connected between the sliding blocks. Casting sand is poured into the sand box, the pressing plate moves downwards to compact the casting sand, then liquid metal is injected into the sand box through the feeding pipe, the liquid metal melts an evanescent mode, then the space of the evanescent mode in the casting sand is filled, and in the casting cooling process, the vibration plate rotates to be matched with the contact plate in an extrusion mode to drive the sand box to vibrate; and therefore, the performance precision of the lathe bed casting is improved, and the service life of the lathe bed casting is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting, in particular to a bed casting of a high-precision CNC lathe. Background Art

[0002] In the current machinery manufacturing industry, the bed casting of high-precision CNC lathes is an important part of the machine tool, which directly affects the overall performance and service life of the machine tool. At present, the bed castings of CNC lathes on the market mainly use traditional sand casting technology. However, when casting the bed casting, the internal intermolecular forces are unbalanced due to factors such as metal cooling shrinkage, phase change, and external constraints. If the residual stress inside the casting cannot be effectively released, it may cause the casting to deform and crack, affecting its performance accuracy and service life.

[0003] In order to solve the above problems, we propose a bed casting for a high-precision CNC lathe, which can reduce the stress generated during casting through high-frequency vibration to improve the performance accuracy and service life of the bed casting. Summary of the invention

[0004] In order to overcome the disadvantage that the residual stress inside the bed casting will affect the performance accuracy and service life of the casting, the present invention provides a bed casting for a high-precision CNC lathe.

[0005] A bed casting of a high-precision CNC lathe comprises a base plate, a symmetrically arranged telescopic rod is fixedly connected to the base plate, a sand box is fixedly connected between the telescopic ends of the symmetrically arranged telescopic rod, a pad is fixedly connected to the bottom of the sand box, a lost mold is placed on the pad, a transversely symmetrical guide rod is fixedly connected to the sand box, a slider is slidably connected to the guide rod, a pressure plate is fixedly connected between the sliders, a transversely symmetrical feed pipe is connected to the pressure plate, a hydraulic cylinder is fixedly connected to the sand box, the telescopic end of the hydraulic cylinder is fixedly connected to a connecting frame, the connecting frame is fixedly connected to the pressing plate, and also comprises a roller, the roller is rotatably connected to the base plate, a motor is fixedly connected to the base plate, the output shaft of the motor is fixedly connected to the roller, a contact plate is fixedly connected to the bottom end of the sand box, a longitudinally symmetrical vibration plate is slidably connected to the roller, the vibration plate rotates and is extruded and matched with the contact plate, a bidirectional screw is rotatably connected to the roller, the bidirectional screw is threadedly connected to the vibration plate, and an internal vibration mechanism is provided on the sand box, and the internal vibration mechanism is used to drive the sand box to vibrate from the inside.

[0006] As an improvement to the above solution, both ends of the bidirectional screw are provided with a rotating handle.

[0007] As an improvement of the above scheme, the internal vibration mechanism includes a vertically symmetrical hollow cylinder, which is fixedly connected to the sand box, a laterally symmetrical sliding rod is slidably connected to the hollow cylinder, a connecting plate is fixedly connected between two vertically adjacent sliding rods, a first spring is connected between the sliding rod and the adjacent hollow cylinder, a laterally symmetrical extrusion wheel is fixedly connected to the sliding rod, a square frame is fixedly connected to the hollow cylinder, an extrusion block is slidably connected to the square frame, a second spring is connected between the extrusion block and the adjacent square frame, and an extrusion assembly for extruding the sliding rod to slide is provided on the bottom plate and the sand box.

[0008] As an improvement of the above solution, one end of the extrusion block close to the extrusion wheel is a laterally symmetrical inclined structure, and the extrusion wheel is extrusion-matched with the adjacent extrusion block.

[0009] As an improvement of the above-mentioned scheme, the extrusion assembly includes a laterally symmetrical extrusion frame, which is fixedly connected to the base plate, and a cross bar is fixedly connected to the connecting plate. Both sides of the sandbox are rotatably connected with longitudinally symmetrical bar rails, which are sleeved on adjacent cross bars and are extrusion-matched with adjacent extrusion frames.

[0010] As an improvement of the above scheme, it also includes a heat dissipation mechanism for accelerating the dissipation of heat inside the sandbox. The heat dissipation mechanism is arranged in the hollow cylinder. The heat dissipation mechanism includes a laterally symmetrical fixing ring. The laterally symmetrical fixing ring is fixedly connected to the hollow cylinder. A rotating cylinder is rotatably connected inside the fixing ring. The rotating cylinder is fixedly connected with blades equidistantly distributed in the circumferential direction. An extrusion rod is fixedly connected to one end of the sliding rod close to the rotating cylinder.

[0011] As an improvement of the above solution, a spiral groove is provided on the rotating cylinder, and the extrusion rod is extruded and matched with the adjacent rotating cylinder through the spiral groove.

[0012] As an improvement of the above solution, filter openings are opened on the hollow cylinder at equal intervals.

[0013] As an improvement of the above scheme, it also includes a positioning mechanism for positioning the lost foam, the positioning mechanism is arranged on the sand box, the positioning mechanism includes a laterally symmetrical mounting plate, the laterally symmetrical mounting plate is fixedly connected to the sand box, a threaded rod is rotatably connected to the mounting plate, a positioning block is threadedly connected to the threaded rod, and the positioning block is slidably connected to the sand box.

[0014] As an improvement of the above solution, the positioning block is provided with scale markings.

[0015] The present invention has the following advantages: 1. The lost foam that is consistent with the shape of the bed casting is placed on a pad in a sand box, and then casting sand is poured into the sand box to fill the area around the lost foam tightly. The pressing plate moves downward to compact the casting sand, and then liquid metal is injected into the sand box through a feed pipe. The liquid metal melts the lost foam and then fills the space of the lost foam in the casting sand. During the cooling process of the casting, the sand box is vibrated by rotating the vibration plate and squeezing the contact plate, thereby reducing or eliminating the residual stress in the casting, so as to improve the performance accuracy and service life of the bed casting. At the same time, the extended length of the vibration plate can be adjusted according to the requirements of different bed castings, thereby adjusting the amplitude of the vibration.

[0016] 2. When the sandbox vibrates up and down, the sliding rod drives the extrusion wheel to move left and right and collide with the extrusion block, thereby driving the hollow cylinder to vibrate. The vibration of the hollow cylinder drives it to vibrate from the inside of the sandbox, further improving the vibration effect.

[0017] 3. The rotation of the blades can speed up the air circulation in the hollow cylinder. Under the action of the filter mouth, the temperature in the casting sand can also be quickly dissipated, making the surface and internal temperature of the bed casting uniform, reducing the temperature gradient, and thus reducing the internal stress of the casting.

[0018] 4. The threaded rod rotates to control the positioning block to move inward. Under the action of the scale mark, the position of the positioning block moving inward can be accurately adjusted. The positioning block is used to position the lost foam, thereby ensuring that the lost foam is placed accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the bottom plate, hydraulic cylinder, connecting frame and other components of the present invention.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the telescopic rod, sandbox, motor and other components of the present invention.

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the sandbox, the backing plate and the lost foam of the present invention.

[0023] Figure 5 It is a schematic cross-sectional structure diagram of the roller, the vibration plate and the bidirectional screw of the present invention.

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the sandbox, hollow cylinder, sliding rod and other components of the present invention.

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the sliding rod, connecting plate, extrusion frame and other components of the present invention.

[0026] Figure 8It is a three-dimensional structural schematic diagram of the extrusion frame, crossbar, bar rail and other components of the present invention.

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first spring, the sliding rod, the extrusion wheel and other components of the present invention.

[0028] Fig.10 It is a schematic cross-sectional structure diagram of the square frame, the extrusion block and the second spring of the present invention.

[0029] Fig.11 It is a schematic cross-sectional view of the rotating cylinder, blades, extrusion rod and other components of the present invention.

[0030] Fig.12 It is a schematic diagram of the three-dimensional structure of the sandbox, mounting plate, threaded rod and positioning block of the present invention.

[0031] Fig.13 It is a schematic cross-sectional structure diagram of the threaded rod and the positioning block of the present invention.

[0032] The names of the numbers in the figure are: 1. bottom plate, 2. telescopic rod, 3. sand box, 31. pad, 32. lost foam, 4. guide rod, 5. slider, 6. pressure plate, 7. feed pipe, 8. hydraulic cylinder, 9. connecting frame, 10. roller, 11. motor, 12. contact plate, 13. vibration plate, 131. bidirectional screw, 14. hollow cylinder, 15. sliding rod, 16. connecting plate, 17. first spring, 18. extrusion wheel, 19. square frame, 20. extrusion block, 201. second spring, 21. extrusion frame, 22. cross bar, 23. bar rail, 24. fixing ring, 25. rotating cylinder, 26. blade, 27. extrusion rod, 28. mounting plate, 29. threaded rod, 30. positioning block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0034] Embodiment 1: A bed casting of a high-precision CNC lathe, such as Figure 1-Figure 5As shown, it includes a bottom plate 1, a telescopic rod 2, a sand box 3, a pad 31, a lost foam 32, a guide rod 4, a slider 5, a pressing plate 6, a feeding pipe 7, a hydraulic cylinder 8, a connecting frame 9, a roller 10, a motor 11, a contact plate 12, a vibrating plate 13, a bidirectional screw 131 and an internal vibration mechanism. The left and right parts of the bottom plate 1 are fixedly connected with the front-and-back symmetrical telescopic rods 2, the telescopic ends of the four telescopic rods 2 are fixedly connected with the sand box 3, the bottom of the sand box 3 is fixedly connected with a pad 31, and a lost foam 32 is placed on the pad 31, the left and right sides of the sand box 3 are fixedly connected with the guide rod 4, the guide rod 4 is slidably connected with a slider 5, the left and right sliders 5 are fixedly connected with a pressing plate 6, the left and right parts of the pressing plate 6 are connected with the feeding pipe 7, and the sand box 3 is fixedly connected with the guide rod 4. A hydraulic cylinder 8 is fixedly connected to the rear side of the box 3, and a connecting frame 9 is fixedly connected to the telescopic end of the hydraulic cylinder 8, and the connecting frame 9 is fixedly connected to the pressure plate 6. A roller 10 is rotatably connected to the middle of the bottom plate 1, and a motor 11 is fixedly connected to the left part of the bottom plate 1, and the output shaft of the motor 11 is fixedly connected to the roller 10. A contact plate 12 is fixedly connected to the lower side of the sand box 3, and a vibration plate 13 is slidably connected to the front and rear parts of the roller 10, and the vibration plate 13 is rotatably pressed and matched with the contact plate 12, and a bidirectional screw 131 is rotatably connected to the right part of the roller 10, and the bidirectional screw 131 is threadedly connected to the vibration plate 13, and a turning handle is provided at both the front and rear ends of the bidirectional screw 131, and an internal vibration mechanism is provided on the sand box 3, and the internal vibration mechanism is used to drive the sand box 3 to vibrate from the inside.

[0035] When using the device, the staff puts the lost foam 32 that is consistent with the shape of the bed casting on the pad 31 in the sand box 3, supports the lost foam 32 through the pad 31, and then pours the casting sand into the sand box 3 to fill the area around the lost foam 32 tightly. Then the staff controls the hydraulic cylinder 8 to shorten, and the hydraulic cylinder 8 shortens and drives the pressure plate 6 to move downward through the connecting frame 9. The slider 5 slides downward on the guide rod 4. After the pressure plate 6 moves downward, it is pressed into the sand box 3 to compact the casting sand. At this time, the staff injects liquid metal into the sand box 3 through the feeding pipe 7. The liquid metal melts the lost foam 32 and fills the space of the lost foam 32 in the casting sand. After the casting is completed, during the cooling process, the staff drives the roller 10 to rotate through the motor 11, and the rotation of the roller 10 drives the vibration plate 13 rotates, and the vibration plate 13 rotates and squeezes and cooperates with the contact plate 12, thereby driving the sand box 3 to vibrate. At the same time, the internal vibration mechanism can also vibrate from the inside of the sand box 3 to further improve the vibration effect. The residual stress in the casting can be reduced or eliminated through high-frequency vibration, so as to improve the performance accuracy and service life of the bed casting. When eliminating the residual stress in the casting through high-frequency vibration, the staff can rotate the bidirectional screw 131 according to the requirements of different bed castings. The rotation of the bidirectional screw 131 drives the vibration plate 13 to move toward or away from each other to adjust the extended length, thereby adjusting the amplitude of the vibration. After the bed casting is formed, the staff drives the connecting frame 9 to move upward through the hydraulic cylinder 8. The upward movement of the connecting frame 9 drives the pressure plate 6 to move upward and open, and then the staff can take the bed casting out of the casting sand.

[0036] like Figure 1 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the internal vibration mechanism includes a hollow cylinder 14, a sliding rod 15, a connecting plate 16, a first spring 17, an extrusion wheel 18, a square frame 19, an extrusion block 20, a second spring 201 and an extrusion assembly. The front and rear parts of the sandbox 3 are fixedly connected with the hollow cylinder 14 symmetrical in the upper and lower parts, and the left and right parts of the hollow cylinder 14 are slidably connected with the sliding rod 15. A connecting plate 16 is fixedly connected between two adjacent sliding rods 15 in the upper and lower parts. The first spring 17 is connected between the sliding rod 15 and the adjacent hollow cylinder 14. The sliding rod 15 The left and right parts are fixedly connected with extrusion wheels 18, and the left and right parts of the hollow cylinder 14 are fixedly connected with two circles of square frames 19, and there are four square frames 19 in one circle. An extrusion block 20 is slidably connected in the square frame 19, and the end of the extrusion block 20 close to the extrusion wheel 18 is a left-right symmetrical inclined structure. The extrusion wheel 18 is extruded and matched with the adjacent extrusion block 20, and a second spring 201 is connected between the extrusion block 20 and the adjacent square frame 19. An extrusion component for extruding the sliding rod 15 to slide left and right is provided on the bottom plate 1 and the sand box 3.

[0037] like Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the extrusion assembly includes an extrusion frame 21, a cross bar 22 and a bar rail 23. The left and right parts of the bottom plate 1 are fixedly connected to the extrusion frame 21, the cross bar 22 is fixedly connected to the connecting plate 16, and the left and right sides of the sandbox 3 are rotatably connected to the front and rear symmetrical bar rails 23, the bar rails 23 are sleeved on the adjacent cross bars 22, and the upper inner side of the extrusion frame 21 is provided with two front and rear downwardly extending protrusions, and the bar rail 23 is extruded and matched with the protrusions of the adjacent extrusion frame 21.

[0038] When the vibration plate 13 and the contact plate 12 are pressed and matched to control the vibration of the sandbox 3, the sandbox 3 will move up and down, and the up and down movement of the sandbox 3 drives the hollow cylinder 14, the sliding rod 15, the connecting plate 16 and the bar rail 23 to move up and down together. When the bar rail 23 moves upward to contact the extrusion frame 21, the lower part of the bar rail 23 is in contact with the protrusion of the extrusion frame 21. The bar rail 23 continues to move upward and will be squeezed by the protrusion of the extrusion frame 21. The lower part of the bar rail 23 swings outward, and the upper part of the bar rail 23 rotates inward. The inward rotation of the bar rail 23 drives the connecting plate 16 to move inward through the cross bar 22. The connecting plate 16 moves inward to drive the sliding rod 15 to slide inward, and the first spring 17 is deformed. When the bar rail 23 moves downward and is no longer contacted by the extrusion frame 21, the sliding rod 15 slides outward and resets under the action of the first spring 17. The sandbox 3 continues to move up and down, which will cause the sliding rod 15 to slide inward and outward continuously. The inward and outward sliding of the sliding rod 15 drives the extrusion wheel 18 to move inward and outward. When the extrusion wheel 18 moves inward and outward, it will continuously collide with the extrusion block 20, thereby driving the hollow cylinder 14 to vibrate. The vibration of the hollow cylinder 14 drives it to vibrate from the inside of the sandbox 3, further improving the vibration effect.

[0039] Embodiment 2: Based on embodiment 1, Fig.11 As shown, it also includes a heat dissipation mechanism for accelerating the dissipation of heat inside the sandbox 3, and the heat dissipation mechanism includes a fixed ring 24, a rotating cylinder 25, blades 26 and an extrusion rod 27. The left and right parts of the hollow cylinder 14 are fixedly connected with the fixed ring 24, and the rotating cylinder 25 is rotatably connected in the fixed ring 24. The rotating cylinder 25 is fixedly connected with blades 26 equidistantly distributed in the circumferential direction, and the sliding rod 15 is fixedly connected with the extrusion rod 27 at one end close to the rotating cylinder 25. The rotating cylinder 25 is provided with a spiral groove, and the extrusion rod 27 is extruded and matched with the adjacent rotating cylinder 25 through the spiral groove. The middle part of the hollow cylinder 14 is provided with equidistantly distributed filter openings.

[0040] When the sliding rod 15 slides inward and outward, the extrusion rod 27 will also move left and right with the sliding rod 15. The left and right movement of the extrusion rod 27 will drive the rotating cylinder 25 to rotate forward and backward through the spiral groove. The forward and reverse rotation of the rotating cylinder 25 drives the blades 26 to rotate. The rotation of the blades 26 can accelerate the air circulation in the hollow cylinder 14. Under the action of the filter mouth, the temperature in the casting sand can also be quickly dissipated, so that the surface and internal temperature of the bed casting are uniform, reducing the temperature gradient, thereby reducing the internal stress of the casting.

[0041] like Figure 1 , Fig.12 and Fig.13 As shown, it also includes a positioning mechanism for positioning the lost foam 32, the positioning mechanism includes a mounting plate 28, a threaded rod 29 and a positioning block 30, the front and rear sides of the sandbox 3 are fixedly connected with left-right symmetrical mounting plates 28, the lower part of the mounting plate 28 is rotatably connected to the threaded rod 29, the threaded rod 29 is threadedly connected to the positioning block 30, the positioning block 30 is slidably connected to the sandbox 3, and the positioning block 30 is provided with scale markings.

[0042] When placing the lost foam 32 on the pad 31, the staff can drive the positioning block 30 to move inward by rotating the threaded rod 29. Since the positioning block 30 is provided with scale marks, the staff can accurately adjust the inward movement position of the positioning block 30. After the positioning block 30 is adjusted, the lost foam 32 is placed, and the lost foam 32 is positioned by the positioning block 30, thereby ensuring that the lost foam 32 is accurately placed.

[0043] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A bed casting for a high-precision CNC lathe, comprising a base plate (1), a symmetrically arranged telescopic rod (2) fixedly connected to the base plate (1), a sand box (3) fixedly connected between the telescopic ends of the symmetrically arranged telescopic rod (2), a pad (31) fixedly connected to the bottom of the sand box (3), a lost foam (32) placed on the pad (31), a transversely symmetrical guide rod (4) fixedly connected to the sand box (3), a slider (5) slidably connected to the guide rod (4), a pressing plate (6) fixedly connected between the sliders (5), a transversely symmetrical feed pipe (7) connected to the pressing plate (6), a hydraulic cylinder (8) fixedly connected to the sand box (3), a connecting frame (9) fixedly connected to the telescopic end of the hydraulic cylinder (8), and the connecting frame (9) fixedly connected to the pressing plate (6), wherein the characteristic is that: The invention also comprises a roller (10), wherein the roller (10) is rotatably connected to the bottom plate (1), a motor (11) is fixedly connected to the bottom plate (1), an output shaft of the motor (11) is fixedly connected to the roller (10), a contact plate (12) is fixedly connected to the bottom end of the sandbox (3), a longitudinally symmetrical vibration plate (13) is slidably connected inside the roller (10), the vibration plate (13) is rotatably pressed and matched with the contact plate (12), a bidirectional screw (131) is rotatably connected inside the roller (10), the bidirectional screw (131) is connected to the vibration plate (13) by threads, and an internal vibration mechanism is provided on the sandbox (3), the internal vibration mechanism is used to drive the sandbox (3) to vibrate from the inside.

2. A bed casting for a high-precision CNC lathe as claimed in claim 1, characterized in that: Both ends of the bidirectional screw rod (131) are provided with rotating handles.

3. A high-precision CNC lathe bed casting as claimed in claim 2, characterized in that the inner The vibration mechanism comprises a vertically symmetrical hollow cylinder (14), the vertically symmetrical hollow cylinder (14) is fixedly connected to the sand box (3), a laterally symmetrical sliding rod (15) is slidably connected to the hollow cylinder (14), a connecting plate (16) is fixedly connected between two vertically adjacent sliding rods (15), a first spring (17) is connected between the sliding rod (15) and the adjacent hollow cylinder (14), a laterally symmetrical extrusion wheel (18) is fixedly connected to the sliding rod (15), a square frame (19) is fixedly connected to the hollow cylinder (14), an extrusion block (20) is slidably connected to the square frame (19), a second spring (201) is connected between the extrusion block (20) and the adjacent square frame (19), and an extrusion assembly for extruding the sliding rod (15) to slide is provided on the bottom plate (1) and the sand box (3).

4. A bed casting for a high-precision CNC lathe as claimed in claim 3, characterized in that: One end of the extrusion block (20) close to the extrusion wheel (18) is a transversely symmetrical inclined structure, and the extrusion wheel (18) is extrusion-matched with the adjacent extrusion block (20).

5. A bed casting for a high-precision CNC lathe as claimed in claim 4, characterized in that: The extrusion assembly comprises a transversely symmetrical extrusion frame (21), the transversely symmetrical extrusion frame (21) is fixedly connected to the bottom plate (1), a cross bar (22) is fixedly connected to the connecting plate (16), and longitudinally symmetrical bar rails (23) are rotatably connected to both sides of the sandbox (3), the bar rails (23) are sleeved on adjacent cross bars (22), and the bar rails (23) are extrusion-matched with adjacent extrusion frames (21).

6. A bed casting for a high-precision CNC lathe as claimed in claim 5, characterized in that: The invention also comprises a heat dissipation mechanism for accelerating the heat dissipation inside the sandbox (3), the heat dissipation mechanism being arranged on the hollow cylinder (14), the heat dissipation mechanism comprising a transversely symmetrical fixing ring (24), the transversely symmetrical fixing ring (24) being fixedly connected to the hollow cylinder (14), a rotating cylinder (25) being rotatably connected inside the fixing ring (24), blades (26) being fixedly connected to the rotating cylinder (25) being equidistantly distributed in the circumferential direction, and an extrusion rod (27) being fixedly connected to one end of the sliding rod (15) close to the rotating cylinder (25).

7. A bed casting for a high-precision CNC lathe as claimed in claim 6, characterized in that: A spiral groove is formed on the rotating cylinder (25), and the extrusion rod (27) is extruded and matched with the adjacent rotating cylinder (25) through the spiral groove.

8. A bed casting for a high-precision CNC lathe as claimed in claim 7, characterized in that: The hollow cylinder (14) is provided with filter openings which are distributed at equal intervals.

9. A bed casting for a high-precision CNC lathe as claimed in claim 8, characterized in that: The invention also comprises a positioning mechanism for positioning the lost foam (32), the positioning mechanism being arranged on the sandbox (3), the positioning mechanism comprising a transversely symmetrical mounting plate (28), the transversely symmetrical mounting plate (28) being fixedly connected to the sandbox (3), a threaded rod (29) being rotatably connected to the mounting plate (28), a positioning block (30) being threadedly connected to the threaded rod (29), and the positioning block (30) being slidably connected to the sandbox (3).

10. A bed casting for a high-precision CNC lathe as claimed in claim 9, characterized in that: The positioning block (30) is provided with scale markings.

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