Numerical control machining clamping tool for die-casting aluminum box blank of electric actuating mechanism and using method of numerical control machining clamping tool

Abstract

The invention discloses a numerical control machining clamping tool for a die-casting aluminum box blank of an electric actuating mechanism and a using method, and relates to the technical field of numerical control machining special-shaped box body clamping equipment. Comprising a motor hole, a hand wheel hole, a control cavity, an electric appliance cavity, an output port and a worm hole, the motor hole comprises a motor hole inner hole face and a motor hole outer end face, a motor hole shoulder face is arranged outside the motor hole, the numerical control machining clamping tool comprises a bottom plate, a large pressing plate and a positioning supporting column, and a centering locking mechanism is further arranged on the bottom plate. The centering locking mechanism comprises a bridge type lever transmission mechanism and a radial jacking mechanism; according to the invention, through the inspection function of the related positioning structure, the time for verifying the positioning posture by an operator is reduced, and the operator can conveniently and quickly adjust.

Description

Technical Field

[0001] This invention relates to the field of CNC machining irregular box clamping equipment technology, and in particular to an improvement in the tooling structure for achieving precise clamping when CNC machining die-cast aluminum box blanks of electric actuators. Technical Background

[0002] Currently, the housing blanks of electric actuators are mostly made using die-cast aluminum molding, resulting in high strength and light weight. However, due to the structural factors of electric actuators, five out of the six sides of the housing blank have functional holes, such as... Figure 8-11 As shown, mechanical motion transmission structures are provided between the motor hole 11, output hole 15, and handwheel hole 12, requiring a high degree of positional accuracy between these three holes. Furthermore, with increasing customer demand for product automation, sensors such as encoders are also needed in the control cavity 13 and electrical cavity 14 on the blank to collect the machine's operating data, requiring high mutual positional accuracy among the functional "holes" on all five surfaces.

[0003] To meet these requirements, existing technologies generally use CNC machine tools as processing equipment. In a single clamping operation, one hole is used as a reference to complete the processing of the other four holes. Then, using one of the machined holes as the clamping reference, a second machining operation is performed on the reference hole from the first clamping operation. However, in actual operation, due to non-circularity of the inner hole opening of the casting, casting flash, and grinding of edges, centering is inaccurate, leading to workpiece skewing. Furthermore, the large size of the workpiece makes it prone to significant precision errors. This causes the form and position tolerances between critical holes to exceed design requirements. Moreover, existing technologies generally use conventional pressure plate structures to fix the box blank, which suffers from low efficiency and high operational intensity.

[0004] Therefore, how to further improve clamping efficiency, enhance machining accuracy, and adapt to the requirements of flexible automated production lines has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] To address the above problems, this invention provides a CNC machining clamping fixture for die-cast aluminum blanks with electric actuators that offers stable clamping, precise positioning, and adaptability to the working rhythm of automated production lines.

[0006] The technical solution of this invention is: a CNC machining clamping fixture for a die-cast aluminum box blank of an electric actuator. The die-cast aluminum box blank includes a motor hole, a handwheel hole, a control cavity, an electrical cavity, an output port, and a worm gear hole. The motor hole includes an inner surface and an outer surface, and a shoulder surface is provided outside the motor hole. The CNC machining clamping fixture includes a base plate, a large pressure plate, and a positioning support column. A centering locking mechanism is also provided on the base plate. The centering locking mechanism includes a bridge lever transmission mechanism and a radial clamping mechanism. The bridge lever transmission mechanism includes a lever, a hinge fulcrum, a control rod, and a limiting screw. The hinge fulcrum is located in the middle of the lever. The outer end of the lever is connected to the control rod through a ball-head hinge structure, and the inner end of the lever is connected to the limiting screw through a ball-head hinge structure. The radial clamping mechanism includes a base, a base cover, a limiting collar, a tapered rod, and at least three push rods. The base is disposed on the base plate, and the base cover is disposed on the base. The base cover has a downwardly extending guide cylinder. The side wall of the guide cylinder has a groove adapted to the push rod. The push rod is disposed in the groove and has a spring return mechanism. The tapered rod is disposed on the limiting screw. The inner end of the push rod is adapted to the tapered rod, and the shape of the outer end face of the push rod is adapted to the inner arc surface of the inner hole of the motor hole. When the control lever is pressed down, the lever drives the limiting screw to move upward, and the tapered surface of the tapered rod on the limiting screw drives the top rod to move radially, which is used to support the inner arc surface of the inner hole of the motor hole; The large pressure plate is used to press against the shoulder surface of the motor hole; The base has a flange ring at its bottom for connecting to the base plate, and the positioning support is located on the flange ring of the base for positioning the outer end face of the motor hole.

[0007] Furthermore, the control lever is characterized by having a pressure cap fitted on it; the pressure cap is threadedly connected to the control lever, and the pressure cap is detachably connected to the base plate.

[0008] Furthermore, the base plate is also provided with a z-axis anti-reverse torsion device, which includes a rod seat and an anti-rotation rod. The rod seat is fixedly installed on the base plate, and the side of the rod seat is provided with a hole adapted to the anti-rotation rod. The anti-rotation rod is adjustablely installed in the hole of the rod seat.

[0009] Furthermore, the base plate is also provided with a Z-direction rearward pressing device, which includes a support rod, a small pressure rod, a small pressure plate, a nut, and a floating rod. The support rod, the small pressure rod, and the floating rod are disposed on the base plate. The top end of the support rod is fixedly connected to the small pressure plate. The small pressure rod passes through the small pressure plate and is disposed on the base plate. The nut is provided at the upper end of the small pressure rod extending out of the small pressure plate. The axes of the support rod, the small pressure rod, and the floating rod are on the same straight line.

[0010] Furthermore, the base plate is also provided with a z-axis anti-torsion device, which includes a limiting seat, a movable block and a small rod. The limiting seat is fixedly installed on the base plate, and the movable block is provided on the side of the limiting seat. The movable block has a hole on its side that is adapted to the small rod, and the small rod is movably installed on the movable block.

[0011] Furthermore, the large pressure plate includes a pressure plate seat, a pressure plate, and a lead screw. The pressure plate seat is fixedly connected to the base plate. The top of the pressure plate seat is provided with a movable pressure plate. The pressure plate is provided with a strip-shaped hole groove adapted to the lead screw. The lead screw passes through the strip-shaped hole groove and is fixedly mounted on the base plate. The top of the lead screw is provided with a fixing nut for fixing the pressure plate.

[0012] As described in the present invention, a method for using a CNC machining clamping fixture for a die-cast aluminum box blank of an electric actuator involves placing the die-cast aluminum box blank on the clamping fixture according to its orientation, and then proceeding with the following steps: 1) Adjust the positioning support so that the outer end face of the motor hole is placed on the adjusting positioning support. 2) Rotate the control lever downwards so that the push rod abuts against the inner surface of the motor hole. 3) Press the large pressure plate against the shoulder surface of the motor hole, and then press the Z-shaped rearward pressing device against the pressable step surface on the upper rear side of the die-cast aluminum box blank. 4) The anti-reverse torsion device around the Z-axis is placed against the side of the outer surface of the control cavity, and the anti-positive torsion device around the Z-axis is placed against the outer end face of the output hole. 5) Begin machining the holes for the handwheel, control chamber, electrical chamber, and output hole.

[0013] Compared with the prior art, the present invention restricts the six degrees of freedom of the die-cast aluminum blank through a centering locking mechanism, a large pressure plate, a z-axis anti-reverse torsion device, a z-axis rearward pressing device, and a z-axis anti-positive torsion device. This effectively avoids the die-cast aluminum blank from being affected by torque during processing, which would cause displacement of the die-cast aluminum blank and thus affect the processing accuracy.

[0014] This invention further improves the stability of die-cast aluminum blank clamping through multi-directional positioning measures, eliminating the need for measuring and correcting pre-positioning dimensions using measuring tools during the original tooling clamping process. This greatly reduces the skill requirements of operators for workpiece clamping, improves the clamping efficiency of die-cast aluminum blanks, and stabilizes the fluctuation range of product shape quality. At the same time, due to the improvement of workpiece skew after processing, the workload of product shape grinding after final assembly is also greatly reduced.

[0015] The technical solution of this invention firstly utilizes key parts as a coarse positioning reference and performs effective internal support clamping; then, through multiple sets of positioning structures, it effectively prevents the impact of cutting reverse torque on the product during the processing of die-cast aluminum blanks, avoids product displacement and flipping during processing, and completely avoids unexpected situations. Furthermore, the inspection function of the relevant positioning structures reduces the time for operators to verify the positioning posture, making it easier for operators to make adjustments more quickly. Attached Figure Description

[0016] Figure 1 This is the three-dimensional representation of the present invention. Figure 1 , Figure 2 This is the three-dimensional representation of the present invention. Figure 2 , Figure 3 This is an exploded view of the present invention. Figure 4 This is a three-dimensional structural diagram of the base plate in this invention. Figure 5 This is a schematic diagram of the clamping mechanism in this invention. Figure 6 yes Figure 5 Sectional view AA Figure 7 This is a schematic diagram of the base cover structure in this invention. Figure 8 It is the three-dimensional form of the workpiece of this invention. Figure 1 , Figure 9 It is the three-dimensional form of the workpiece of this invention. Figure 2 , Figure 10 It is the three-dimensional form of the workpiece of this invention. Figure 3 , Figure 11 This is a three-dimensional schematic diagram of the invention in use. Figure 1 , Figure 12 This is a three-dimensional schematic diagram of the invention in use. Figure 2 ; Figure 1 shows a die-cast aluminum box blank. 11 is the motor hole, 111 is the outer end face of the motor hole, 112 is the inner surface of the motor hole, and 113 is the shoulder surface of the motor hole. 12 is the handwheel hole. 13 is the control cavity, and 131 is the outer surface of the control cavity. 14 is the electrical cavity. 15 is the output port, and 151 is the outer end face of the output port. 16. Signage mounting bosses 2 is the base plate, 21 is the groove. 3 is the centering and locking mechanism, 31 is the bridge lever transmission mechanism, 311 is the lever, 312 is the fulcrum, 313 is the control lever, 3130 is the pressure cap, and 314 is the limit screw. 32 is the radial clamping mechanism, 321 is the base, 322 is the base cover, 3221 is the guide cylinder, 32211 is the slide groove, 323 is the tapered rod, 324 is the push rod, and 325 is the limiting collar. 4 is the large pressure plate, 41 is the pressure plate seat, 42 is the pressure plate, and 43 is the lead screw. 5 is the anti-reverse torsion device around the z-axis, 51 is the rod seat, and 52 is the anti-rotation rod. 6 is the Z-shaped rearward clamping device, 61 is the support rod, 62 is the small pressure rod, 63 is the small pressure plate, 64 is the nut, and 65 is the floating rod. 7 is the anti-torsion device around the z-axis, 71 is the limit seat, 72 is the movable block, and 73 is the small rod. 8 is the positioning support; Figure 1 An xyz reference coordinate system was established. Figure 6 The center arrow indicates the direction of movement of the relevant component. Detailed Implementation

[0017] To make the purpose, technical solution, and beneficial technical effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0018] A CNC machining clamping fixture for a die-cast aluminum box blank of an electric actuator, wherein the die-cast aluminum box blank 1, as shown in the figure... Figure 8-10 As shown, it includes a motor hole 11, a handwheel hole 12, a control cavity 13, an electrical cavity 14, an output port 15, and a worm gear hole 16. The motor hole 11 includes an inner hole surface 112 and an outer end surface 111 of the motor hole with a die-casting accuracy of ±0.02~0.1mm. A motor hole shoulder surface 113 is provided on the outside of the motor hole 111.

[0019] like Figure 1-7 As shown, the CNC machining clamping fixture includes a base plate 2, a large pressure plate 4, and a positioning support column 8. A centering locking mechanism 3 is also provided on the base plate 2. The centering locking mechanism 3 includes a bridge lever transmission mechanism 31 and a radial clamping mechanism 32.

[0020] The bridge lever transmission mechanism includes a lever 311, a hinge fulcrum 312, a control lever 313, and a limit screw 314. The hinge fulcrum 312 is located in the middle of the lever 311. The outer end of the lever 311 is connected to the control lever 313 through a ball joint hinge structure, and the inner end of the lever 311 is connected to the limit screw 314 through a ball joint hinge structure.

[0021] The radial clamping mechanism 32 includes a base 321, a base cover 322, a limiting collar 325, a tapered rod 323, and at least three push rods 324. The base 321 is mounted on the base plate 2, and the base cover 322 is mounted on the base 321. The base cover 322 has a downwardly extending guide cylinder 3221. The side wall of the guide cylinder 3221 has a groove 32211 that is adapted to the push rod 324. The push rod 324 is mounted in the groove 32211 and has a spring return mechanism. The tapered rod 323 is mounted on the limiting screw 314. The inner end of the push rod 324 is adapted to the tapered rod 323, and the shape of the outer end face of the push rod 324 is adapted to the inner arc surface of the inner hole surface 112 of the motor hole.

[0022] When the control lever 313 is pressed down, the lever 311 drives the limit screw 314 to move upward, and the conical surface of the tapered rod 323 on the limit screw 314 drives the top rod 324 to move radially, which is used to support the inner arc surface of the inner hole surface 112 of the motor hole. The large pressure plate 4 is used to press against the shoulder surface 113 of the motor hole, and is used to press forward.

[0023] The bottom of the base 321 is provided with a flange ring for connecting the base plate 2, and the positioning support 8 is provided on the flange ring of the base 321 for positioning the outer end face 111 of the motor hole.

[0024] Furthermore, a pressure cap 3130 is fitted onto the control lever 313; the pressure cap 313 is threadedly connected to the control lever 313, and the pressure cap 313 is detachably connected to the base plate 2. For example... Figure 6 As shown by the arrow, when the control lever 313 is turned / rotated, the control lever 313 moves downward, which in turn raises the limit screw 314 through the lever 311, thereby driving the radially arranged top rod 324 to open and press against the inner arc surface of the inner hole 112 of the motor hole; the advantage of using a threaded structure is that it has a certain locking performance and can effectively maintain the locked state.

[0025] Furthermore, the base plate 2 is also equipped with a z-axis anti-reverse torsion device 5. The z-axis anti-reverse torsion device 5 includes a rod seat 51 and an anti-rotation rod 52. The rod seat 51 is fixedly mounted on the base plate 2, and a hole adapted to the anti-rotation rod 52 is opened on the side of the rod seat 51. The anti-rotation rod 52 is adjustablely mounted in the hole of the rod seat 51. When processing the die-cast aluminum blank 1, the anti-rotation rod 52 of the anti-rotation rod mechanism 5 presses against the outer surface 131 of the control cavity 13 to prevent the counterclockwise torque generated in the z-axis during the processing of the die-cast aluminum blank 1, which would cause the die-cast aluminum blank 1 to rotate counterclockwise around the z-axis and affect the product accuracy. Furthermore, the base plate 2 is also provided with a Z-direction rearward pressing device 6. The Z-direction rearward pressing device 6 includes a support rod 61, a small pressure rod 62, a small pressure plate 63, a nut 64, and a floating rod 65. The support rod 61, the small pressure rod 62, and the floating rod 65 are arranged on the base plate 2. The top end of the support rod 61 is fixedly connected to the small pressure plate 63. The small pressure rod 62 passes through the small pressure plate 63 and is arranged on the base plate 2. The upper end of the small pressure rod 62 extending out of the small pressure plate 63 is provided with a nut 64. The axes of the support rod 61, the small pressure rod 62, and the floating rod 65 are on the same straight line. When the die-cast aluminum blank 1 is placed in the clamping fixture, the floating rod 65 rests on the lower platform of the nameplate mounting boss 16, and the small pressure plate 63 rests on the upper platform of the nameplate mounting boss 16. By adjusting the nut 64 on the small pressure rod 62, the die-cast aluminum blank 1 can be clamped, preventing the die-cast aluminum blank 1 from generating torque in the x and y axes during processing, which would cause the aluminum blank 1 to rotate around the x and y axes and affect the product accuracy.

[0026] Furthermore, the base plate 2 is also equipped with a z-axis anti-torsion device 7. The z-axis anti-torsion device 7 includes a limiting seat 71, a movable block 72, and a small rod 73. The limiting seat 71 is fixedly mounted on the base plate 2, and the movable block 72 is provided on the side of the limiting seat 71. The side of the movable block 72 has a hole adapted to the small rod 73, and the small rod 73 is movably mounted on the movable block 72. When processing the die-cast aluminum blank 1, the small rod 73 on the z-axis anti-torsion device 7 abuts against the outer end face 151 of the output hole 15, preventing the clockwise torque in the z-axis generated during the processing of the die-cast aluminum blank 1, which would cause the die-cast aluminum blank 1 to rotate clockwise around the z-axis, affecting the product accuracy. In addition, when the small rod 73 abuts against the outer end face 151 of the output hole, it not only achieves the function of preventing clockwise (positive) torque, but also serves as a y-axis positioning.

[0027] Furthermore, the large pressure plate 4 includes a pressure plate base 41, a pressure plate 42, and a lead screw 43. The pressure plate base 41 is fixedly connected to the base plate 2. The top of the pressure plate base 41 is provided with a movable pressure plate 42. The pressure plate 42 has a slotted hole adapted to the lead screw 43. The lead screw 43 passes through the slotted hole and is fixedly mounted on the base plate 2. The top of the lead screw 43 is provided with a fixing nut for fixing the pressure plate 42. The pressure plate 42 can be radially finely adjusted by the slotted hole when pressing against the shoulder surface 113 of the motor hole.

[0028] like Figure 11 , 12 As shown, the method of using a CNC machining clamping fixture for a die-cast aluminum box blank of the present invention involves placing the die-cast aluminum box blank 1 on the clamping fixture in a certain direction, and then proceeding with the following steps: 1) Adjust the positioning support 8 so that the outer end face 111 of the motor hole is placed on the positioning support 8. At this time, the outer end face 111 of the motor hole is not used as a positioning reference, but initially serves as a support for the box blank. 2) Rotate the control lever 313 downwards so that the push rod 324 abuts against the inner surface 112 of the motor hole. Given the dimensional and positional tolerances between the inner surface 112 of the motor hole and the handwheel hole 12, control cavity 13, electrical cavity 14, and output hole 15, this embodiment uses the inner surface 112 of the motor hole as the positioning datum. If there is a dimensional and positional error between the outer end face 111 of the motor hole and the inner surface 112 of the motor hole, the workpiece is clamped using the inner surface 112 of the motor hole as the clamping datum. This achieves constraints on the x-axis and the y-axis degrees of freedom. 3) The large pressure plate 4 is pressed against the shoulder surface 113 of the motor hole, and then the z-axis rearward pressing device 6 is pressed against the pressable step surface on the upper rear side of the die-cast aluminum box blank 1. In the specific die-cast aluminum box blank of the electric actuator, since there is a nameplate mounting boss 16 at this position, it is used as the pressing platform surface in this embodiment. The constraint of the rotational degree of freedom around the x-axis, as well as the constraints of the z and y-axis degrees of freedom, are realized. 4) The anti-reverse torsion device 5 around the z-axis abuts against the side of the outer surface 131 of the control cavity, and the anti-positive torsion device 7 around the z-axis abuts against the outer end face 151 of the output hole. The anti-reverse torsion device 5 around the z-axis and the anti-positive torsion device 7 around the z-axis are respectively set on the base plate 2, thereby realizing the constraint of the positive and negative rotational degrees of freedom around the z-axis. 5) Begin machining the holes for the handwheel hole 12, control cavity 13, electrical cavity 14 and output hole 15.

[0029] Of course, after completing the above processing, any one of the holes can be used as a clamping reference to reverse the processing of the motor hole 11.

[0030] This invention ingeniously utilizes a centering and locking mechanism 3, which consists of a bridge-type lever transmission mechanism 31 and a radial clamping mechanism 32, to achieve efficient clamping of a die-cast aluminum blank 1 with a certain die-casting precision and a complex structure. It also uses the blank as a positioning reference to process other holes. Compared with the existing clamping measures for electric actuator blanks with complex structures, this invention significantly improves clamping precision and efficiency, and has high clamping stability and reliability, making it suitable for use in automated production lines.

[0031] It should be stated that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to the present invention based on the technical content disclosed in this application. However, such variations, as long as they do not depart from the spirit of the present invention, should be within the protection scope of the present invention. Furthermore, some terminology used in this specification and claims is not limiting but merely for ease of description.

Claims

1. A CNC machining clamping fixture for a die-cast aluminum box blank of an electric actuator, the die-cast aluminum box blank (1) includes a motor hole (11), a handwheel hole (12), a control cavity (13), an electrical cavity (14), an output port (15) and a worm hole (16), the motor hole (11) includes an inner surface (112) and an outer end surface (111) of the motor hole, and a shoulder surface (113) of the motor hole (111) is provided outside the motor hole (111). The CNC machining clamping fixture includes a base plate (2), a large pressure plate (4), and a positioning support (8), characterized in that, A centering locking mechanism (3) is also provided on the base plate (2), which includes a bridge lever transmission mechanism (31) and a radial clamping mechanism (32). The bridge lever transmission mechanism includes a lever (311), a hinge fulcrum (312), a control lever (313), and a limiting screw (314). The hinge fulcrum (312) is located in the middle of the lever (311). The outer end of the lever (311) is connected to the control lever (313) through a ball joint hinge structure, and the inner end of the lever (311) is connected to the limiting screw (314) through a ball joint hinge structure. The radial clamping mechanism (32) includes a base (321), a base cover (322), a limiting collar (325), a cone rod (323), and at least three push rods (324). The base (321) is mounted on the base plate (2), and the base cover (322) is mounted on the base (321). The base cover (322) has a downwardly extending guide cylinder (3221), and the side wall of the guide cylinder (3221) has an opening that is consistent with... The push rod (324) is adapted to the slide groove (32211), and the push rod (324) is provided in the slide groove (32211). The push rod (324) is provided with a spring reset mechanism; the cone rod (323) is provided on the limiting screw (314); the inner end of the push rod (324) is adapted to the cone rod (323), and the shape of the outer end face of the push rod (324) is adapted to the inner arc surface of the inner hole surface (112) of the motor hole; When the control lever (313) is pressed down, the lever (311) drives the limiting screw (314) to move upward. The conical surface of the conical rod (323) on the limiting screw (314) drives the top rod (324) to move radially, which is used to support the inner arc surface of the inner hole surface (112) of the motor hole. The large pressure plate (4) is used to press against the shoulder surface (113) of the motor hole. The bottom of the base (321) is provided with a flange ring for connecting the base plate (2), and the positioning support (8) is provided on the flange ring of the base (321) for positioning the outer end face (111) of the motor hole.

2. The CNC machining clamping fixture for a die-cast aluminum blank of an electric actuator according to claim 1, characterized in that, A pressure cap (3130) is fitted on the control lever (313); the pressure cap (313) is connected to the control lever (313) by a thread, and the pressure cap (313) is detachably connected to the base plate (2).

3. The CNC machining clamping fixture for a die-cast aluminum blank of an electric actuator according to claim 1, characterized in that, The base plate (2) is also provided with a z-axis anti-reverse torsion device (5). The z-axis anti-reverse torsion device (5) includes a rod seat (51) and an anti-rotation rod (52). The rod seat (51) is fixedly installed on the base plate (2). The side of the rod seat (51) is provided with a hole that is adapted to the anti-rotation rod (52). The anti-rotation rod (52) can be adjusted and installed in the hole of the rod seat (51).

4. The CNC machining clamping fixture for a die-cast aluminum blank of an electric actuator according to claim 1, characterized in that, The base plate (2) is also provided with a z-rear pressing device (6). The z-rear pressing device (6) includes a support rod (61), a small pressure rod (62), a small pressure plate (63), a nut (64), and a floating rod (65). The support rod (61), the small pressure rod (62), and the floating rod (65) are arranged on the base plate (2). The top end of the support rod (61) is fixedly connected to the small pressure plate (63). The small pressure rod (62) passes through the small pressure plate (63) and is arranged on the base plate (2). The nut (64) is provided at the upper end of the small pressure rod (62) extending out of the small pressure plate (63). The axes of the support rod (61), the small pressure rod (62), and the floating rod (65) are on the same straight line.

5. The CNC machining clamping fixture for a die-cast aluminum blank of an electric actuator according to claim 1, characterized in that, The base plate (2) is also provided with a z-axis anti-torsion device (7). The z-axis anti-torsion device (7) includes a limiting seat (71), a movable block (72) and a small rod (73). The limiting seat (71) is fixedly installed on the base plate (2). The movable block (72) is provided on the side of the limiting seat (71). The movable block (72) has a hole on the side of the movable block (72) that is adapted to the small rod (73). The small rod (73) can be movably installed on the movable block (72).

6. The CNC machining clamping fixture for a die-cast aluminum blank of an electric actuator according to claim 1, characterized in that, The large pressure plate (4) includes a pressure plate seat (41), a pressure plate (42), and a lead screw (43). The pressure plate seat (41) is fixedly connected to the base plate (2). The top of the pressure plate seat (41) is provided with the movable pressure plate (42). The pressure plate (42) is provided with a strip-shaped hole groove that is adapted to the lead screw (43). The lead screw (43) passes through the strip-shaped hole groove and is fixedly installed on the base plate (2). The top of the lead screw (43) is provided with a fixing nut for fixing the pressure plate (42).

7. The method of using the CNC machining clamping fixture for die-cast aluminum blanks of electric actuators as described in claim 1, characterized in that, Place the die-cast aluminum box blank (1) in the clamping fixture according to its orientation, and then proceed with the following steps: 1) Adjust the positioning support (8) so that the outer end face (111) of the motor hole is placed on the adjusting positioning support (8). 2) Rotate the control lever (313) downwards so that the push rod (324) abuts against the inner surface (112) of the motor hole. 3) Press the large pressure plate (4) against the shoulder surface (113) of the motor hole, and then press the z-shaped rearward pressing device (6) against the pressable step surface on the upper rear side of the die-cast aluminum box blank (1). 4) The anti-reverse torsion device (5) around the z-axis is abutted against the side of the outer surface (131) of the control cavity, and the anti-positive torsion device (7) around the z-axis is abutted against the outer end face (151) of the output hole. 5) Begin hole cutting of the handwheel hole (12), control cavity (13), electrical cavity (14) and output hole (15).

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