Tool for drilling large magnesium-aluminum alloy casting

Abstract

The invention belongs to the technical field of casting tools, and particularly discloses a magnesium-aluminum alloy large casting drilling tool which comprises a fixing frame and a positioning platform, and a lifting frame is arranged on one side of the fixing frame; a driven gear is rotationally installed in the positioning platform, clamping units are arranged on the two sides of the upper portion of the positioning platform, a lower pressing rod is connected to the lower portion of the lifting frame, a sleeve is arranged between the fixing frame and the positioning platform, a driving gear meshed with the driven gear is rotationally installed on the sleeve, and clamping units are arranged on the two sides of the upper portion of the positioning platform. A driving unit is arranged on the rear side of the positioning platform; the acting force of ascending or descending of the pressing rod is used as driving force, the driving unit drives the clamping unit to limit the position of the to-be-machined workpiece and then conduct drilling, after drilling is completed, the pressing rod ascends, and the to-be-machined workpiece rotates through cooperation between a driving gear and a driven gear; therefore, through holes in different positions, staggered up and down, of the workpiece to be machined are drilled.

Description

Technical Field

[0001] The invention belongs to the technical field of casting tooling, and in particular relates to a tooling for drilling a large magnesium-aluminum alloy casting. Background Art

[0002] Magnesium aluminum alloy is a kind of alloy, the density is generally less than 1.8g·cm3, the low density of magnesium and aluminum alloy makes its specific performance improved. Magnesium aluminum alloy has good strength, rigidity and dimensional stability.

[0003] After the magnesium aluminum alloy casting is completed (such as Fig.10 As shown in the figure), it is necessary to drill the mounting holes at the mounting position of the casting. Since the magnesium-aluminum alloy casting is divided into two layers, it is necessary to drill holes step by step. The common methods of drilling holes in magnesium-aluminum alloy castings are as follows:

[0004] 1. Semi-automatic method: Place the magnesium-aluminum alloy casting on the processing table, fix it manually and drill the magnesium-aluminum alloy casting by lifting the drill bit. However, manual operation is time-consuming and labor-intensive, and the position accuracy of the drilling holes in the magnesium-aluminum alloy casting cannot be guaranteed;

[0005] 2. Fully automatic method: After placing the magnesium-aluminum alloy casting on the processing table, the position of the magnesium-aluminum alloy casting is fixed by a clamping device, and then the magnesium-aluminum alloy casting is drilled by a drill. However, due to the shape limitation of the magnesium-aluminum alloy casting to be processed and the particularity of the upper and lower drilling positions (such as Fig.10 As shown in the figure, after the magnesium-aluminum alloy casting is rotated, the single clamping method of the clamping device cannot accurately define the position of the magnesium-aluminum alloy casting, and secondary processing is required for the drilling positions of the upper and lower layers of the magnesium-aluminum alloy casting. Therefore, a tooling for drilling large magnesium-aluminum alloy castings is proposed to solve the above-mentioned problems. Summary of the invention

[0006] In view of the above problems, the present invention proposes a tool for drilling large magnesium-aluminum alloy castings, which effectively solves the technical problem of low processing efficiency of magnesium-aluminum alloy castings.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a tool for drilling holes in large magnesium-aluminum alloy castings, comprising a fixed frame and a positioning platform arranged on one side of the fixed frame, a lifting frame is arranged on one side of the fixed frame, and a drill bit is installed at the bottom of the lifting frame; a driven gear is rotatably installed inside the positioning platform, a rotating column is fixedly connected above the driven gear, and a positioning column is fixedly connected above the rotating column, clamping units are arranged on both sides above the positioning platform, a lower pressure rod is connected below the lifting frame, a sleeve is arranged between the fixed frame and the positioning platform, a driving gear meshing with the driven gear is rotatably installed on the sleeve, a pressure rod is elastically slidably provided on the lower pressure rod, clamping units are arranged on both sides above the positioning platform, and a driving unit is arranged on the rear side of the positioning platform, and the lower pressure rod is used in conjunction with the driving unit to clamp the workpiece to be processed.

[0008] Furthermore, the sleeve is divided into two sections, the driving gear is rotatably installed between the two sleeves, the lower ends of the two lower pressure rods are provided with spiral pieces, the middle part of the driving gear is provided with a accommodating cavity, the upper side of the accommodating cavity is provided with a first rack, a rotating disk is slidably connected in the accommodating cavity, a rotating sleeve used in conjunction with the spiral piece is installed in the middle part of the rotating disk, and a second rack used in conjunction with the first rack is provided above the rotating disk.

[0009] Furthermore, the spiral sheet includes a threaded section and a cylindrical section, the cylindrical section is fixedly connected to the lower end of the lower pressure rod, the threaded section is fixed on the cylindrical section, a spiral groove is formed in the rotating sleeve, a circular hole is formed in the middle of the spiral groove, and the diameter of the cylindrical section is adapted to the diameter of the circular hole.

[0010] Furthermore, the clamping unit includes a fixed shell, and the opposite side of the two fixed shells is open. The first clamping plate and the second clamping plate are slidably installed inside the fixed shell. The first clamping plate and the second clamping plate are arranged in sequence along the up and down directions of the fixed shell. A transmission gear is arranged between the first clamping plate and the second clamping plate, and the first clamping plate and the second clamping plate are relative to each other through the transmission gear.

[0011] Furthermore, a groove is provided between the first clamping plate and the second clamping plate, tooth grooves are provided on both sides of the groove, and the transmission gear is located in the groove and meshes with the tooth grooves.

[0012] Furthermore, one end of the first clamping plate facing the positioning column is groove-shaped and is used in conjunction with the second positioning area of ​​the workpiece to be processed, and one end of the second clamping plate facing the positioning column is convex-shaped and is used in conjunction with the first positioning area of ​​the workpiece to be processed.

[0013] Furthermore, the driving unit includes a sliding plate and a pressure rod used in conjunction with the sliding plate, the sliding plate elastically slides on the positioning platform, both ends of the sliding plate are hinged with hinged rods, the hinged rods are fixedly connected to a connecting rod rotatably connected to a transmission gear on one side of the fixed shell, and the transmission gear is coaxially arranged with the connecting rod.

[0014] Furthermore, a sliding cavity is provided inside the positioning column, and the sliding cavity is cylindrical. A support column is vertically provided in the sliding cavity, and the support column is fixedly connected with a conical plate and a circular plate from top to bottom. A compression spring is connected between the circular plate and the sliding cavity, and a plurality of symmetrically arranged sliding members are fixedly connected in the circumferential direction of the circular plate. A guide groove corresponding to the sliding member is provided on the positioning column, and the sliding member passes through the guide groove toward and protrudes from the positioning column. A plurality of top plates are arranged in the circumferential direction of the conical plate, and one end of the top plate away from the conical plate passes through the positioning column, and one end of the top plate close to the conical plate has an inclined surface used in conjunction with the conical plate, and the top plate is elastically arranged between the sliding cavity.

[0015] Furthermore, a pressure plate is arranged above the positioning column, the support column passes through the positioning column and is fixedly connected to the pressure plate, and the lifting frame is fixedly installed with a telescopic top rod corresponding to the pressure plate.

[0016] Furthermore, a receiving groove is provided on the lower pressure rod, the pressure rod is located in the receiving groove and a first spring is fixedly installed between the pressure rod and the receiving groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses the force of the downward pressure rod rising or falling as the driving force after the workpiece to be processed is placed in a preset position, and the lifting frame descends to enable the driving unit to drive the clamping unit to limit the position of the workpiece to be processed, and then the drill bit continues to move downward to drill the through hole of the workpiece to be processed. After the drilling of one of the through holes of the workpiece to be processed is completed, the downward pressure rod rises with the lifting frame, and the cooperation between the driving gear and the driven gear allows the workpiece to be processed to rotate a certain angle, thereby realizing the drilling of through holes in different positions of the workpiece to be processed, thereby solving the problem that the through holes of the workpiece to be processed that are staggered up and down need to be processed more than twice. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the drilling tool of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the pressing unit of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the positioning column of the present invention;

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the positioning platform of the present invention;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the positioning column of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the cooperation between the pressing rod and the sleeve of the present invention;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the sleeve of the present invention;

[0026] Figure 8 It is a schematic diagram of the top view of the rotating sleeve of the present invention;

[0027] Fig. 9 It is a schematic diagram of the cross-sectional structure of the fixed shell of the present invention;

[0028] Fig.10 It is a schematic structural diagram of the workpiece to be processed according to the present invention.

[0029] In the figure: 1, fixed frame; 2, positioning platform; 3, lower pressure rod; 4, sliding plate; 5, workpiece to be processed; 11, base; 12, driver; 13, lifting frame; 14, power unit; 15, drill bit; 16, telescopic push rod; 21, positioning column; 22, fixed shell; 23, driven gear; 31, pressure rod; 32, sleeve; 33, driving gear; 34, spiral piece; 341, threaded section; 342, cylindrical section; 41, hinged rod; 42, connecting rod; 43, transmission gear; 201, arc groove; 202, plane section; 203, limit groove; 204, second spring; 205, compression Spring; 211, sliding cavity; 212, supporting column; 213, conical plate; 214, circular plate; 215, top plate; 216, sliding member; 217, elastic member; 218, pressure plate; 219, guide groove; 221, first clamping plate; 222, second clamping plate; 223, groove; 224, tooth groove; 225, slideway; 231, rotating column; 311, accommodating cavity; 312, first spring; 331, sleeve ring; 332, first rack; 333, rotating disk; 334, second rack; 335, rotating sleeve; 51, through hole; 52, first positioning area; 53, second positioning area. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figures 1 to 10 As shown, a tool for drilling a large magnesium-aluminum alloy casting includes a fixed frame 1 and a positioning platform 2 arranged on one side of the fixed frame 1. A base 11 is arranged below the fixed frame 1, and a lifting frame 13 is arranged on one side of the fixed frame 1. In detail, a rectangular groove is opened on the front side of the fixed frame 1, and a threaded rod is rotatably installed inside the rectangular groove. A driver 12 is arranged above the fixed frame 1. The driver 12 is a motor. The rotating shaft of the driver 12 passes through the fixed frame 1 and extends into the rectangular groove and is connected to the threaded rod. One end of the lifting frame 13 is located in the rectangular groove and is threadedly connected to the threaded rod. A power unit 14 is fixedly connected above the lifting frame 13. The power unit 14 is a motor. A drill bit 15 is installed below the lifting frame 13 and is connected to the power unit 14, so as to drive the drill bit 15 to rotate to drill the workpiece 5 to be processed.

[0032] A driven gear 23 is rotatably installed inside the positioning platform 2. Specifically, in order to facilitate the meshing transmission between the driving gear 33 and the driven gear 23, the present invention provides an arc groove 201 that is connected to the inside of the positioning platform 2 at the circumferential lower part of the positioning platform 2, and one side of the driven gear 23 is located in the arc groove 201. A rotating column 231 is fixedly connected above the driven gear 23, and a positioning column 21 is fixedly connected above the rotating column 231. Clamping units are provided on both sides of the upper part of the positioning platform 2. A lower pressure rod 3 is connected below the lifting frame 13. A sleeve 32 is provided between the fixed frame 1 and the positioning platform 2. The sleeve 32 is fixedly connected to the base 11. The driving gear 33 meshing with the driven gear 23 is rotatably installed on the sleeve 32. A pressure rod 31 is elastically slidably provided on the lower pressure rod 3. Specifically, a receiving groove is provided on the lower pressure rod 3. The pressure rod 31 is located in the receiving groove and a first spring 312 is fixedly installed between the pressure rod 3 and the receiving groove. Clamping units are arranged on both sides above the positioning platform 2, and a driving unit is arranged on the rear side of the positioning platform 2. The pressing rod 3 cooperates with the driving unit. When the pressing rod 3 descends, the driving unit drives the clamping unit to clamp the workpiece 5.

[0033] In the above scheme, after the workpiece 5 is placed in the preset position, the force of the lower pressure rod 3 rising or falling is used as the driving force. After the lifting frame 13 descends, the driving unit drives the clamping unit to limit the position of the workpiece 5, and the drill bit 15 continues to move downward to drill the through hole 51 of the workpiece 5. After the drilling of one of the through holes 51 of the workpiece 5 is completed, the lower pressure rod 3 rises with the lifting frame 13, and through the cooperation between the driving gear 33 and the driven gear 23, the workpiece 5 is rotated by a certain angle, thereby realizing the drilling of the through holes 51 at different positions of the workpiece 5, thereby solving the problem that the through holes 51 of the workpiece 5 that are staggered up and down need to be processed more than twice.

[0034] In this embodiment, the sleeve 32 is divided into two sections, and the driving gear 33 is rotatably installed between the two sleeves 32. Specifically, the driving gear 33 is connected to the two sleeves 32 through bearings. The lower ends of the two lower pressure rods 3 are provided with spiral pieces 34, and the middle part of the driving gear 33 is provided with a receiving chamber 311. The upper side of the receiving chamber 311 is provided with a first rack 332. A rotating disk 333 is slidably connected in the receiving chamber 311. The middle part of the rotating disk 333 is provided with a rotating sleeve 335 used in conjunction with the spiral piece 34. Specifically, the spiral piece 34 includes a threaded section 341 and a cylindrical section 342. The cylindrical section 342 is fixedly connected to the lower end of the lower pressure rod 3. The threaded section 341 is fixed on the cylindrical section 342. A spiral groove is formed in the rotating sleeve 335. A circular hole is formed in the middle part of the spiral groove. The diameter of the cylindrical section 342 is adapted to the diameter of the circular hole. A second rack 334 used in conjunction with the first rack 332 is provided above the rotating disk 333.

[0035] In the above scheme, during the downward movement of the spiral piece 34, the spiral piece 34 causes the rotating disk 333 to idle in the accommodating chamber 311 through the rotating sleeve 335. During the upward movement of the spiral piece 34, the threaded segment 341 on the spiral piece 34 causes the rotating disk 333 to rotate while rising through the rotating sleeve 335, and drives the driving gear 33 to rotate under the cooperation between the first rack 332 and the second rack 334, so that the driving gear 33 drives the driven gear 23 to rotate, so as to ensure that the driven gear 23 can rotate only when the lower pressure rod 3 rises.

[0036] When the lower pressing rod 3 is ascending, the cylindrical section 342 first moves out of the spiral groove on the rotating sleeve 335, so that the two first clamping plates 221 and the second clamping plates 222 release the positioning of the workpiece 5 to facilitate the rotation of the workpiece 5.

[0037] In this embodiment, the clamping unit includes a fixed shell 22, and two slideways 225 are provided on the rear side of the fixed shell 22. The opposite side of the fixed shell 22 is open. The interior of the fixed shell 22 is slidably mounted with a first clamping plate 221 and a second clamping plate 222. The first clamping plate 221 and the second clamping plate 222 are sequentially arranged along the upper and lower directions of the fixed shell 22. The end of the first clamping plate 221 facing the positioning column 21 is a groove 223 type and is used in conjunction with the second positioning area 53 of the workpiece 5 to be processed. The second clamping plate 222 faces the positioning column 21. One end of the positioning column 21 is convex and is used in conjunction with the first positioning area 52 of the workpiece 5 to be processed. A transmission gear 43 is arranged between the first clamping plate 221 and the second clamping plate 222. The first clamping plate 221 and the second clamping plate 222 are relative to each other through the transmission gear 43. In detail, a groove 223 is provided between the first clamping plate 221 and the second clamping plate 222, and tooth grooves 224 are provided on both sides of the groove 223. The transmission gear 43 is located in the groove 223 and meshes with the tooth grooves 224.

[0038] In the above scheme, after the first clamping plate 221 first contacts with the second positioning area 53, the second clamping plate 222 will move into the first positioning area 52 under the action of the transmission gear 43 and contact with the first positioning area 52, so as to fix the position of the workpiece 5 to be processed. After the workpiece 5 to be processed rotates by an angle, the second clamping plate 222 will first contact with the first positioning area 52, so as to achieve accurate positioning of the workpiece 5 to be processed, avoid the situation where the punching position of the workpiece 5 to be processed is offset, and can also ensure that the upper and lower through holes 51 of the workpiece 5 to be processed are punched in sequence without affecting the drilling of the workpiece 5 to be processed.

[0039] In this embodiment, the driving unit includes a sliding plate 4 and a pressure rod 31 used in conjunction with the sliding plate 4. The sliding plate 4 elastically slides on the positioning platform 2. In detail, in order to facilitate the sliding plate 4 to automatically reset after moving up and down the positioning platform 2, a plane section 202 is provided on one side of the positioning platform 2 of the present invention, and a limiting groove 203 is provided on the plane section 202. The sliding plate 4 has a limiting block on the side facing the limiting groove 203. The limiting block can limit the sliding plate 4 in the limiting groove 203 to prevent the sliding plate 4 from escaping from the limiting groove 203. A second spring 204 is installed between the limiting block and the limiting groove 203, and the elastic force of the first spring 312 is smaller than the elastic force of the second spring 204; both ends of the sliding plate 4 are hinged with a hinged rod 41, and the hinged rod 41 is fixedly connected with a connecting rod 42 on the side facing the fixed shell 22. The connecting rod 42 passes through the slideway 225 and is rotatably connected with the transmission gear 43. The transmission gear 43 and the connecting rod 42 are coaxially arranged.

[0040] In the above scheme, the sliding plate 4 moves downward. Since the fixed shell 22 is fixed in position, the sliding plate 4 drives the two connecting rods 42 to move toward each other through the hinge rod 41, so that the first clamping plate 221 and the second clamping plate 222 move synchronously toward the workpiece 5 to be processed, thereby achieving the position fixation of the workpiece 5 to be processed.

[0041] In this embodiment, in order to fix the position of the workpiece 5, the present invention opens a sliding cavity 211 inside the positioning column 21. The sliding cavity 211 is cylindrical. A support column 212 is vertically arranged in the sliding cavity 211. The support column 212 is fixedly connected with a conical plate 213 and a circular plate 214 from top to bottom. A compression spring 205 is connected between the circular plate 214 and the sliding cavity 211. A plurality of sliding members 216 arranged symmetrically are fixedly connected to the circumference of the circular plate 214. The positioning column 21 is opened There is a guide groove 219 corresponding to the sliding member 216, and the sliding member 216 passes through the guide groove 219 toward and protrudes from the positioning column 21. A plurality of top plates 215 are arranged in the circumference of the conical plate 213. The end of the top plate 215 away from the conical plate 213 passes through the positioning column 21, and the end of the top plate 215 close to the conical plate 213 has an inclined surface used in conjunction with the conical plate 213. An elastic member 217 is provided between the top plate 215 and the sliding cavity 211. The elastic member 217 is a spring or a rubber column with an elastic structure.

[0042] In the above scheme, the weight of the workpiece 5 to be processed is utilized so that the workpiece 5 to be processed presses down the sliding member 216. The sliding member 216, through the cooperation among the circular plate 214, the support column 212 and the conical plate 213, enables the top plate 215 to extend out of the sliding cavity and move toward the inner wall of the workpiece 5 to be processed. After the top plate 215 contacts the inner wall of the workpiece 5 to be processed, the preliminary fixation of the position of the workpiece 5 to be processed is completed.

[0043] In this embodiment, in order to further stabilize the position of the workpiece 5 and increase the friction between the workpiece 5 and the top plate 215, a pressure plate 218 is arranged above the positioning column 21, and the support column 212 passes through the positioning column 21 and is fixedly connected to the pressure plate 218. The lifting frame 13 is fixedly installed with a telescopic top rod 16 corresponding to the pressure plate 218, and the length of the telescopic top rod 16 is greater than the length of the drill bit 15.

[0044] In the above solution, the telescopic push rod 16 first contacts the pressing plate 218, so that the push plate 215 further presses the workpiece 5 to be processed, thereby ensuring the friction between the positioning column 21 and the workpiece 5 to be processed.

[0045] In this solution, the diameters of the through holes 51 of the upper and lower layers of the workpiece 5 to be processed are equal, thereby avoiding the need to replace the drill bit 15 .

[0046] Working principle of the present invention:

[0047] The workpiece 5 to be processed is placed on the positioning column 21 on the positioning platform 2. The position where the workpiece 5 to be processed is placed is symmetrical, so that the middle part of the workpiece 5 to be processed is sleeved on the positioning column 21. Due to the weight of the workpiece 5 to be processed, the workpiece 5 will drive the circular plate 214 to move downward through the sliding member 216. At the same time, the circular plate 214 drives the conical plate 213 to drive the top plate 215 to move to the outside of the positioning column 21 through the supporting column 212, so that the positioning column 21 defines the position of the workpiece 5 to be processed.

[0048] Subsequently, the driver 12 starts to drive the lifting frame 13 to move downward, the pressure rod 31 first contacts the sliding plate 4, causing the sliding plate 4 to move downward, the second spring 204 is compressed, and the sliding plate 4 drives the connecting rod 42 to move through the hinge rod 41, so that the connecting rod 42 drives the first clamping plate 221 and the second clamping plate 222 to move toward the workpiece 5 to be processed at the same time through the transmission gear 43. When the first clamping plate 221 or the second clamping plate 222 contacts the workpiece 5 to be processed, such as the first clamping plate 221 corresponds to the second positioning area 53, the second clamping plate 222 does not move due to the protruding position of the workpiece 5 to be processed, and the first clamping plate 221 continues to move under the action of the transmission gear 43 to contact the second positioning area 53, thereby fixing the position of the workpiece 5 to be processed. Conversely, the same is true after the second clamping plate 222 is positioned with the first positioning area 52.

[0049] Then the lifting frame 13 continues to move downward, and the drill bit 15 contacts the workpiece 5 to drill the through hole 51 on the workpiece 5. At this time, since the first clamping plate 221 and the second clamping plate 222 have completed the support of the workpiece 5, the position of the sliding plate 4 is fixed. During the descent of the lifting frame 13, the pressing rod 31 moves in the accommodating cavity 311, so that the first spring 312 is compressed.

[0050] The lowering rod 3 follows the descent of the lifting frame 13 and enters the sleeve 32. The spiral piece 34 enters the collar 331 and contacts the rotating sleeve 335. Since the second rack 334 and the first rack 332 are not meshed, the spiral piece 34 drives the rotating disk 333 to rotate idly in the collar 331 through the rotating sleeve 335, and the driving gear 33 does not participate in the rotation.

[0051] When the drill bit 15 finishes drilling a through hole 51 of the workpiece 5, the lifting frame 13 rises, and the spiral piece 34 on the lower pressure rod 3 rises along with the lifting frame 13. At this time, the spiral piece 34 drives the rotating disk 333 to rise through the rotating sleeve 335, so that the second rack 334 is meshed with the first rack 332, thereby driving the driving gear 33 to rotate. The driving gear 33 drives the driven gear 23 to rotate through the driven gear 23, thereby driving the workpiece 5 on the positioning column 21 to rotate forty-five degrees, so that the drill bit 15 can drill another through hole 51.

[0052] At this time, the pressing rod 31 is reset first under the action of the first spring 312, and then the sliding plate 4 is reset under the action of the second spring 204, so that the first clamping plate 221 and the second clamping plate 222 complete the processing of the through hole 51 on the workpiece 5 in sequence according to the above steps.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for drilling a large magnesium-aluminum alloy casting, comprising a fixing frame (1) and a positioning platform (2) arranged on one side of the fixing frame (1), a lifting frame (13) that can be lifted and lowered is arranged on one side of the fixing frame (1), and a drill bit (15) is installed below the lifting frame (13); the characteristics are: A driven gear (23) is rotatably mounted inside the positioning platform (2), a rotating column (231) is fixedly connected above the driven gear (23), a positioning column (21) is fixedly connected above the rotating column (231), clamping units are arranged on both sides above the positioning platform (2), a lower pressure rod (3) is connected below the lifting frame (13), a sleeve (32) is arranged between the fixed frame (1) and the positioning platform (2), a driving gear (33) meshing with the driven gear (23) is rotatably mounted on the sleeve (32), a pressure rod (31) is elastically slidably arranged on the lower pressure rod (3), clamping units are arranged on both sides above the positioning platform (2), a driving unit is arranged on the rear side of the positioning platform (2), and the lower pressure rod (3) is used in conjunction with the driving unit to clamp the workpiece (5) to be processed.

2. The tooling for drilling large magnesium-aluminum alloy castings according to claim 1 is characterized in that: The sleeve (32) is divided into two sections, the driving gear (33) is rotatably mounted between the two sleeves (32), the lower ends of the two lower pressure rods (3) are provided with spiral pieces (34), a receiving cavity (311) is provided in the middle of the driving gear (33), a first rack (332) is provided on the upper side of the receiving cavity (311), a rotating disk (333) is slidably connected in the receiving cavity (311), a rotating sleeve (335) used in conjunction with the spiral piece (34) is installed in the middle of the rotating disk (333), and a second rack (334) used in conjunction with the first rack (332) is provided above the rotating disk (333).

3. The tooling for drilling large magnesium-aluminum alloy castings according to claim 2 is characterized in that: The spiral sheet (34) comprises a threaded section (341) and a cylindrical section (342); the cylindrical section (342) is fixedly connected to the lower end of the lower pressure rod (3); the threaded section (341) is fixed on the cylindrical section (342); a spiral groove is formed in the rotating sleeve (335); a circular hole is formed in the middle of the spiral groove; and the diameter of the cylindrical section (342) matches the diameter of the circular hole.

4. The tooling for drilling large magnesium-aluminum alloy castings according to claim 1 is characterized in that: The clamping unit comprises a fixed shell (22), wherein one side of the two fixed shells (22) opposite to each other is open, and a first clamping plate (221) and a second clamping plate (222) are slidably mounted inside the fixed shell (22) in an upward and downward direction, wherein the first clamping plate (221) and the second clamping plate (222) are sequentially arranged in the upward and downward directions of the fixed shell (22), and a transmission gear (43) is arranged between the first clamping plate (221) and the second clamping plate (222), and the first clamping plate (221) and the second clamping plate (222) are relatively movable via the transmission gear (43).

5. The tooling for drilling large magnesium-aluminum alloy castings according to claim 4 is characterized in that: A groove (223) is provided between the first clamping plate (221) and the second clamping plate (222), tooth grooves (224) are provided on both sides of the groove (223), and the transmission gear (43) is located in the groove (223) and meshes with the tooth grooves (224).

6. The tooling for drilling large magnesium-aluminum alloy castings according to claim 4 is characterized in that: One end of the first clamping plate (221) facing the positioning column (21) is in the form of a groove (223) and is used in conjunction with a second positioning area (53) of the workpiece (5) to be processed, and one end of the second clamping plate (222) facing the positioning column (21) is in the form of a convex shape and is used in conjunction with the first positioning area (52) of the workpiece (5) to be processed.

7. The tooling for drilling large magnesium-aluminum alloy castings according to claim 1 is characterized in that: The driving unit comprises a sliding plate (4) and a pressure rod (31) used in conjunction with the sliding plate (4); the sliding plate (4) slides elastically on the positioning platform (2); both ends of the sliding plate (4) are hinged with hinge rods (41); a connecting rod (42) rotatably connected to a transmission gear (43) is fixedly connected to the side of the hinge rod (41) facing the fixed shell (22); the transmission gear (43) and the connecting rod (42) are coaxially arranged.

8. The tooling for drilling large magnesium-aluminum alloy castings according to claim 1 is characterized in that: A sliding cavity (211) is provided inside the positioning column (21), and the sliding cavity (211) is cylindrical. A support column (212) is vertically provided inside the sliding cavity (211). The support column (212) is fixedly connected to a conical plate (213) and a circular plate (214) from top to bottom. A compression spring (205) is connected between the circular plate (214) and the sliding cavity (211). A plurality of symmetrically arranged sliding members (216) are fixedly connected to the circumference of the circular plate (214). The positioning column (21) is provided with a A guide groove (219) corresponding to the sliding member (216) is provided. The sliding member (216) passes through the guide groove (219) toward and protrudes from the positioning column (21). A plurality of top plates (215) are arranged in the circumferential direction of the conical plate (213). One end of the top plate (215) away from the conical plate (213) passes through the positioning column (21), and one end of the top plate (215) close to the conical plate (213) has an inclined surface for use with the conical plate (213). The top plate (215) is elastically arranged between the sliding cavity (211).

9. The tooling for drilling large magnesium-aluminum alloy castings according to claim 8 is characterized in that: A pressing plate (218) is arranged above the positioning column (21), the supporting column (212) passes through the positioning column (21) and is fixedly connected to the pressing plate (218), and the lifting frame (13) is fixedly mounted with a telescopic push rod (16) corresponding to the pressing plate (218).

10. The tooling for drilling large magnesium-aluminum alloy castings according to claim 1, characterized in that: The lower pressure rod (3) is provided with a receiving groove, the pressure rod (31) is located in the receiving groove, and a first spring (312) is fixedly installed between the pressure rod and the receiving groove.

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