A positioning fixture for milling arc split surface of casting and its use method

Abstract

The present invention discloses a positioning fixture for the circular arc splitting surface of a milling casting and a method for using the same. The positioning fixture comprises a base, support panels are arranged on both sides of the upper surface of the base, inner yoke plates are arranged on the inner side walls of the support panels, a support nail plate is arranged on one side of the inner yoke plate, a workpiece with a circular arc splitting surface of a milling casting to be processed is arranged between two groups of support panels, and an adjustment component is arranged outside the two groups of support panels, wherein the workpiece is placed on the upper surface of the support nail plate between the two groups of support panels, and the horizontal / vertical position of the workpiece is adjusted by the adjustment component. The present invention can quickly position and align the circular arc splitting surface of the milling casting, and at the same time, the clamping is reliable, the processing and measurement are simple, the processing efficiency is high, and the dimensional accuracy is high; and the operation is simple, the use is convenient, and the circular arc splitting surface of the milling casting can be quickly processed in batches.

Description

Technical Field

[0001] The invention relates to a positioning fixture for milling arc splitting surface of a casting and a use method thereof. Background Art

[0002] Castings are metal shaped objects obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods, and then cooled and polished to obtain objects with a certain shape, size and performance.

[0003] During the processing of castings, most of them need to go through the processes of turning, clamping, milling, planing and grinding to form the final product.

[0004] Milling is to fix the blank and use a high-speed rotating milling cutter to cut out the required shape and features. Traditional milling is mostly used for milling simple shape features such as contours and grooves.

[0005] Traditionally, arc-split surfaces of milled castings are mostly fixed and clamped by traditional screws, but the clamping positioning and alignment are difficult, which in turn affects the processing efficiency of the arc-split surfaces of milled castings, and the dimensional accuracy is low. Therefore, a positioning fixture for the arc-split surfaces of milled castings and a method for using the same are proposed. Summary of the invention

[0006] The object of the present invention is to provide a positioning fixture for milling the arc split surface of a casting and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a positioning fixture for the circular arc splitting surface of a milled casting, comprising a base, support panels are arranged on both sides of the upper surface of the base, an inner yoke plate is arranged on the inner side wall of the support panel, a support nail plate is arranged on one side of the inner yoke plate, and a workpiece with a circular arc splitting surface of a milled casting to be processed is arranged between two groups of the support panels.

[0008] The two groups of support panels are provided with adjustment components on the outside.

[0009] The workpiece is placed on the upper surface of the support nail plate between two sets of support panels, and the lateral / longitudinal position of the workpiece is adjusted by adjusting the components.

[0010] Preferably, longitudinal adjustment screw holes are provided on both sides of the support enclosure, and transverse adjustment screw holes are provided on one side of the support enclosure.

[0011] Preferably, the adjustment assembly includes adjustment screws arranged on both sides of the support panel and abutment screws arranged on one side of the support panel, the adjustment screws cooperate with the longitudinal adjustment screw holes, and the abutment screws cooperate with the transverse adjustment screw holes.

[0012] The adjusting screw is rotated to one side of the workpiece through the longitudinal adjustment screw hole to squeeze and adjust the longitudinal position of the workpiece, and the abutment screw is rotated to one side of the workpiece through the transverse adjustment screw hole to squeeze and adjust the transverse position of the workpiece.

[0013] Preferably, a fixing sleeve is provided in the middle of the base, an inner screw hole is opened in the middle of the fixing sleeve, and a stud is provided inside the inner screw hole.

[0014] Preferably, a pressure plate is connected to the upper part of the stud, and a nut is arranged on the upper part of the pressure plate.

[0015] The stud bolt passes through the through hole in the middle of the workpiece, the pressing plate is sleeved on the outer circumference of the stud bolt, and the pressing plate is connected with a nut to fix the workpiece above the base.

[0016] Preferably, fixing components are provided on both sides of the base, and the fixing components connect and fix the base to the equipment workbench;

[0017] The fixing assembly includes fixing buckles arranged on both sides of the base, a buckle column is connected below the fixing buckle, and a locking sleeve is connected to the outer periphery of the buckle column.

[0018] The locking sleeve is connected to the outer periphery of the buckle column, driving the base to be connected to one side of the equipment workbench.

[0019] Preferably, two groups of insertion grooves are provided on the outer circumference of the buckle column, an inner buckle groove is provided on one side of the insertion groove, and the inner buckle groove is in an "L" shape.

[0020] Preferably, the inner wall of the locking sleeve is provided with two groups of guide blocks that cooperate with the insertion grooves, and elastic rods are provided on both sides of one end of the locking sleeve away from the guide blocks, and support plates are provided on both sides of the elastic rods, one side of the support plate is connected to a rotating shaft, and one side of the rotating shaft is connected to a rotating cylinder, and an inner arm is provided between the two groups of rotating cylinders.

[0021] The outer periphery of the locking sleeve is provided with an external sleeve.

[0022] The inner arm is connected to the inside of the outer sleeve, and one end of the inner arm is connected to a baffle.

[0023] The locking sleeve drives the elastic rod to abut against the bottom of the equipment workbench, and the connected inner armature rod is displaced in the external sleeve.

[0024] Preferably, a spring is provided on the outer periphery of the inner armature rod, and the spring is located between the baffle plate and the outer sleeve, so that the inner armature rod can move elastically between the outer sleeve.

[0025] A method for using a positioning fixture for milling a circular arc split surface of a casting, comprising the following steps:

[0026] Step A, fixing of the fixture;

[0027] Step a1, place the base on the upper surface of the equipment workbench, so that the buckle column below the fixing buckle is inserted into the through hole position of the equipment workbench, and then extend the guide rods on both sides of the inner wall of the locking sleeve into the groove and connect to the outer periphery of the buckle column;

[0028] Step a2, holding the locking sleeve by hand and moving it upward, so that the elastic rods on both sides of the locking sleeve abut against the lower surface of the equipment workbench, and the top surfaces of the elastic rods are located on the lower surface of the equipment workbench and elastically slide toward both sides, respectively, driving the inner armature rod to rotate between the rotating shafts of the support plates through the rotating cylinder;

[0029] Step a3, the inner armature rod is connected to the baffle plate and moves toward the outside of the external sleeve, so that the baffle plate squeezes the spring between the baffle plate and the outlet of the external sleeve, and the spring is compressed to generate a certain elastic force;

[0030] Step a4, when the guide block on the inner side wall of the locking sleeve moves to the end of the insertion groove, the locking sleeve is rotated to move the connecting guide block to one side of the inner buckle groove;

[0031] Step a5, release the force exerted by the hand on the locking sleeve, at this time the elastic force generated by the spring in step a3 is released, the spring stretches, and drives the elastic rod on one side of the inner arm to slide in the opposite direction, completing the fixation between the locking sleeve, the fixing buckle and the equipment workbench;

[0032] Step B, positioning the arc split surface of the milling casting;

[0033] Step b1, placing the workpiece with the arc split surface of the milled casting on the upper surface of the support nail plate on one side of the inner yoke plate between the two sets of support enclosures, so that the middle part of the workpiece is connected to the top of the base through the studs, and the placement of the workpiece with the arc split surface of the milled casting is completed through the support top plate;

[0034] Step b2, milling the casting arc split surface, three of the four small flange surfaces on the reverse side of the split surface of the workpiece blank are positioned and aligned, taking into account the sealing groove of the non-machined surface, the inner cavity size and the split surface and the flange, and padding the remaining small flange surfaces to achieve the positioning reference with the non-machined surface of the blank;

[0035] Step b3, respectively rotating the adjusting screw / the abutting screw, so that the adjusting screw / the abutting screw is rotated to one side of the workpiece through the longitudinal adjustment screw hole / the transverse adjustment screw hole, so as to achieve longitudinal / lateral position adjustment of the workpiece and positioning of the workpiece;

[0036] Step b4: Sleeve the pressure plate onto the outside of the stud, lock the throat and rotate the nut to the upper surface of the pressure plate to complete the fixation of the workpiece.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention can quickly position and align the arc-divided surface of the milled casting by means of the adjustment component, and at the same time, the clamping is reliable, the processing and measurement are simple, the processing efficiency is high, and the dimensional accuracy is high; and the operation is simple and the use is convenient, and the arc-divided surface of the milled casting can be quickly processed in batches.

[0039] 2. The present invention can quickly connect and fix the base between the equipment workbenches by setting up a fixing component. Compared with traditional connection and fixing methods such as screws and positioning pins, it is more convenient and quick, and the device can be fixed without using external tools. At the same time, through the elastic effect of the elastic rod, the connection stability of the base can be guaranteed, and no gap will be generated between the base and the equipment workbench, making the use effect of the base more stable. At the same time, disassembly and assembly are more convenient, and use is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the base structure of an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the bottom structure of a base according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of a locking sleeve according to an embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of the cross-sectional structure of a locking sleeve according to an embodiment of the present invention;

[0045] Figure 6 It is an enlarged schematic diagram of the structure at location A of an embodiment of the present invention.

[0046] In the figure: 1. base; 2. support enclosure; 201. longitudinal adjustment screw hole; 202. transverse adjustment screw hole; 3. inner mortise plate; 301. support nail plate; 4. fixing sleeve; 401. inner screw hole; 5. fixing buckle; 501. buckle column; 502. insertion slot; 503. inner buckle slot; 6. adjustment screw; 7. abutment screw; 8. workpiece; 9. pressure plate; 10. nut; 1001. stud; 11. locking sleeve; 1101. external sleeve; 1102. inner mortise rod; 1103. baffle; 1104. spring; 1105. rotating cylinder; 1106. rotating shaft; 1107. support plate; 1108. elastic rod; 1109. guide block. DETAILED DESCRIPTION

[0047] In order to solve the problems of difficult clamping, positioning and alignment of arc-divided surfaces of existing milling castings, low processing efficiency and low dimensional accuracy, the present invention provides a positioning fixture for arc-divided surfaces of milling castings and a method for using the same. The technical scheme of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. Obviously, the invention described is only a part of the invention of the present invention, not all of it. All other inventions obtained by ordinary technicians in this field without creative work based on the invention in the present invention belong to the scope of protection of the present invention.

[0048] See also Figure 1-6 The present invention provides a positioning fixture for the circular arc split surface of a milled casting, comprising a base 1, support panels 2 are arranged on both sides of the upper surface of the base 1, an inner yoke plate 3 is arranged on the inner side wall of the support panel 2, a support nail plate 301 is arranged on one side of the inner yoke plate 3, and a milled casting circular arc split surface workpiece 8 to be processed is arranged between two groups of support panels 2.

[0049] The two sets of support panels 2 are provided with adjustment components on the outside.

[0050] The workpiece 8 is placed on the upper surface of the support nail plate 301 between the two groups of support panels 2, and the lateral / longitudinal position of the workpiece 8 is adjusted by adjusting the adjustment component.

[0051] Furthermore, longitudinal adjustment screw holes 201 are provided on both sides of the support enclosure 2, and transverse adjustment screw holes 202 are provided on one side of the support enclosure 2.

[0052] The further adjustment assembly includes adjustment screws 6 arranged on both sides of the support panel 2 and abutment screws 7 arranged on one side of the support panel 2. The adjustment screws 6 cooperate with the longitudinal adjustment screw holes 201, and the abutment screws 7 cooperate with the transverse adjustment screw holes 202.

[0053] The adjusting screw 6 is rotated to one side of the workpiece 8 through the longitudinal adjustment screw hole 201 to squeeze and adjust the longitudinal position of the workpiece 8, and the abutting screw 7 is rotated to one side of the workpiece 8 through the transverse adjustment screw hole 202 to squeeze and adjust the transverse position of the workpiece 8.

[0054] Furthermore, a fixing sleeve 4 is provided in the middle of the base 1 , an inner screw hole 401 is provided in the middle of the fixing sleeve 4 , and a stud 1001 is provided inside the inner screw hole 401 .

[0055] Furthermore, a pressure plate 9 is connected to the upper part of the stud 1001, and a nut 10 is arranged on the upper part of the pressure plate 9.

[0056] The stud 1001 passes through the through hole in the middle of the workpiece 8 , and the pressing plate 9 is sleeved on the outer circumference of the stud 1001 . The pressing plate 9 is connected by a nut 10 to fix the workpiece 8 above the base 1 .

[0057] Further, fixing components are provided on both sides of the base 1, and the fixing components connect and fix the base 1 to the equipment workbench;

[0058] The fixing assembly includes fixing buckles 5 arranged on both sides of the base 1, a buckle column 501 is connected to the bottom of the fixing buckle 5, and a locking sleeve 11 is connected to the outer periphery of the buckle column 501.

[0059] The locking sleeve 11 is connected to the outer periphery of the buckle column 501, driving the base 1 to be connected to one side of the equipment workbench.

[0060] Furthermore, two groups of insertion grooves 502 are formed on the outer periphery of the buckle column 501 , and an inner buckle groove 503 is formed on one side of the insertion groove 502 . The inner buckle groove 503 is in an “L” shape.

[0061] Furthermore, the inner wall of the locking sleeve 11 is provided with two groups of guide blocks 1109 that cooperate with the insertion groove 502. Elastic rods 1108 are provided on both sides of one end of the locking sleeve 11 away from the guide blocks 1109. Support plates 1107 are provided on both sides of the elastic rod 1108. A rotating shaft 1106 is connected to one side of the support plate 1107. A rotating cylinder 1105 is connected to one side of the rotating shaft 1106. An inner arm 1102 is provided between the two groups of rotating cylinders 1105.

[0062] The outer periphery of the locking sleeve 11 is provided with an external sleeve 1101.

[0063] The inner arm 1102 is connected to the inside of the outer sleeve 1101, and one end of the inner arm 1102 is connected to a baffle 1103.

[0064] The locking sleeve 11 drives the elastic rod 1108 to abut against the bottom of the equipment workbench, and the internal connecting rod 1102 is displaced in the external sleeve 1101.

[0065] Furthermore, a spring 1104 is provided on the outer periphery of the inner armature rod 1102 , and the spring 1104 is located between the baffle plate 1103 and the outer sleeve 1101 , so that the inner armature rod 1102 can move elastically between the outer sleeve 1101 .

[0066] A method for using a positioning fixture for milling a circular arc split surface of a casting, comprising the following steps:

[0067] Step A, fixing of the fixture;

[0068] Step a1, place the base 1 on the upper surface of the equipment workbench, so that the buckle column 501 below the fixing buckle 5 is inserted into the through hole position of the equipment workbench, and then the guide rods on both sides of the inner wall of the locking sleeve 11 are inserted into the groove 502 and connected to the outer periphery of the buckle column 501;

[0069] Step a2, holding the locking sleeve 11 by hand and moving it upward, so that the elastic rods 1108 on both sides of the locking sleeve 11 abut against the lower surface of the equipment workbench, and the top surfaces of the elastic rods 1108 are located on the lower surface of the equipment workbench and elastically slide toward both sides, driving the inner arm 1102 to rotate between the rotating shaft 1106 of the support plate 1107 through the rotating cylinder 1105;

[0070] Step a3, the inner armature 1102 is connected to the baffle 1103 and moves toward the outside of the external sleeve 1101, so that the baffle 1103 squeezes the spring 1104 between the baffle 1103 and the outlet of the external sleeve 1101, and the spring 1104 is compressed to generate a certain elastic force;

[0071] Step a4: when the guide block 1109 on the inner wall of the locking sleeve 11 moves to the end of the insertion groove 502, the locking sleeve 11 is rotated to move the connecting guide block 1109 to the side of the inner buckle groove 503;

[0072] Step a5, release the force exerted by the hand on the locking sleeve 11, at this time, the elastic force generated by the spring 1104 in step a3 is released, the spring 1104 extends, and drives the elastic rod 1108 on one side of the inner arm 1102 to slide in the opposite direction, completing the fixation between the locking sleeve 11, the fixing buckle 5 and the equipment workbench;

[0073] Step B, positioning the arc split surface of the milling casting;

[0074] Step b1, placing the workpiece 8 with a milled arc split surface on the upper surface of the support nail plate 301 on one side of the inner yoke plate 3 between the two sets of support enclosure plates 2, so that the middle part of the workpiece 8 passes through the stud 1001 and is connected to the top of the base 1, and the workpiece 8 with a milled arc split surface is placed by supporting the top plate;

[0075] Step b2, milling the casting arc split surface workpiece 8, four small flange surfaces on the reverse side of the split surface of the blank, three of which are positioned and aligned, taking into account the non-machined surface sealing groove, inner cavity size and split surface and flange, and padding the remaining small flange surfaces to achieve the positioning reference with the blank non-machined surface;

[0076] Step b3, respectively rotate the adjusting screw 6 / the abutting screw 7, so that the adjusting screw 6 / the abutting screw 7 is rotated to one side of the workpiece 8 through the longitudinal adjustment screw hole 201 / the transverse adjustment screw hole 202, so as to achieve longitudinal / lateral position adjustment of the workpiece 8 and positioning of the workpiece 8;

[0077] Step b4: Sleeve the pressing plate 9 onto the outside of the stud 1001, lock the nut 10 to the upper surface of the pressing plate 9, and fix the workpiece 8.

[0078] The positioning fixture for milling the arc split surface of a casting and the use method thereof of the present invention have the following advantages:

[0079] The present invention can quickly position and align the arc split surface of the milled casting by means of the arranged adjustment component, and at the same time, the clamping is reliable, the processing and measurement are simple, the processing efficiency is high, and the dimensional accuracy is high; moreover, the operation is simple and the use is convenient, and the arc split surface of the milled casting can be quickly processed in batches.

[0080] The present invention can quickly connect and fix the base 1 between the equipment workbenches by setting up a fixing component. Compared with traditional connection and fixing methods such as screws and positioning pins, it is more convenient and quick, and the device can be fixed without using external tools. At the same time, through the elastic effect of the elastic rod 1108, the connection stability of the base 1 can be guaranteed, and no gap will be generated between the base 1 and the equipment workbench, making the use effect of the base 1 more stable. At the same time, disassembly and assembly are more convenient, and use is more convenient.

[0081] While the invention has been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made thereto without departing from the principles and spirit of the invention, the scope of the invention being defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for milling arc split surface of castings, characterized by: It comprises a base (1), support panels (2) are arranged on both sides of the upper surface of the base (1), longitudinal adjustment screw holes (201) are opened on both sides of the support panel (2), and transverse adjustment screw holes (202) are opened on one side of the support panel (2); The inner side wall of the support enclosure (2) is provided with an inner yoke plate (3), one side of the inner yoke plate (3) is provided with a support nail plate (301), and a milled casting arc split surface workpiece (8) to be processed is provided between two groups of the support enclosure plates (2). The two groups of support panels (2) are provided with adjustment components on the outside, the adjustment components comprising adjustment screws (6) provided on both sides of the support panels (2) and abutment screws (7) provided on one side of the support panels (2), the adjustment screws (6) and the longitudinal adjustment screw holes (201) cooperate with each other, and the abutment screws (7) and the transverse adjustment screw holes (202) cooperate with each other. The adjusting screw (6) is rotated to one side of the workpiece (8) through the longitudinal adjustment screw hole (201) to adjust the longitudinal position of the workpiece (8) by compression, and the abutting screw (7) is rotated to one side of the workpiece (8) through the transverse adjustment screw hole (202) to adjust the transverse position of the workpiece (8) by compression; A fixing sleeve (4) is provided in the middle of the base (1), an inner screw hole (401) is provided in the middle of the fixing sleeve (4), and a stud bolt (1001) is provided inside the inner screw hole (401); The upper part of the stud bolt (1001) is connected to a pressure plate (9), and the upper part of the pressure plate (9) is provided with a nut (10). The stud bolt (1001) passes through the through hole in the middle of the workpiece (8), the pressing plate (9) is sleeved on the outer circumference of the stud bolt (1001), and the pressing plate (9) is connected with a nut (10) to fix the workpiece (8) above the base (1); The workpiece (8) is placed on the upper surface of the support nail plate (301) between the two sets of support enclosures (2), and the horizontal / vertical position of the workpiece (8) is adjusted by means of an adjustment component.

2. A positioning fixture for milling arc splitting surface of a casting according to claim 1, characterized in that: Fixing components are provided on both sides of the base (1), and the fixing components connect and fix the base (1) to the equipment workbench; The fixing assembly comprises fixing buckles (5) arranged on both sides of the base (1), a buckle column (501) is connected below the fixing buckle (5), and a locking sleeve (11) is connected to the outer periphery of the buckle column (501). The locking sleeve (11) is connected to the outer periphery of the buckle column (501), driving the base (1) to be connected to one side of the equipment workbench.

3. A positioning fixture for milling arc split surface of casting according to claim 2, characterized in that: Two groups of insertion grooves (502) are formed on the outer periphery of the buckle column (501), an inner buckle groove (503) is formed on one side of the insertion groove (502), and the inner buckle groove (503) is in an "L" shape.

4. A positioning fixture for milling arc split surface of casting according to claim 3, characterized in that: The inner wall of the locking sleeve (11) is provided with two groups of guide blocks (1109) that cooperate with the insertion groove (502); elastic rods (1108) are provided on both sides of one end of the locking sleeve (111) away from the guide blocks (1109); support plates (1107) are provided on both sides of the elastic rods (1108); one side of the support plate (1107) is connected to a rotating shaft (1106); one side of the rotating shaft (1106) is connected to a rotating cylinder (1105); an inner armature rod (1102) is provided between the two groups of rotating cylinders (1105); An external sleeve (1101) is provided on the outer periphery of the locking sleeve (11). The inner armature rod (1102) is connected to the inside of the outer sleeve (1101), and one end of the inner armature rod (1102) is connected to a baffle (1103). The locking sleeve (11) drives the elastic rod (1108) to abut against the bottom of the equipment workbench, and the connected inner armature rod (1102) is displaced in the outer sleeve (1101).

5. A positioning fixture for milling arc split surface of casting according to claim 4, characterized in that: A spring (1104) is provided on the outer periphery of the inner armature rod (1102); the spring (1104) is located between the baffle plate (1103) and the outer sleeve (1101), so as to enable the inner armature rod (1102) to move elastically between the outer sleeve (1101).

6. A method for using a positioning fixture for milling a circular arc split surface of a casting according to claim 5, characterized in that: The following steps are involved: Step (A), fixing of the fixture; Step (a1), placing the base (1) on the upper surface of the equipment workbench, so that the buckle column (501) below the fixing buckle (5) is inserted into the through hole position of the equipment workbench, and then the guide rods on both sides of the inner wall of the locking sleeve (11) are inserted into the groove (502) and connected to the outer periphery of the buckle column (501); Step (a2), holding the locking sleeve (11) by hand and moving it upward, so that the elastic rods (1108) on both sides of the locking sleeve (11) abut against the lower surface of the equipment workbench, and the top end surfaces of the elastic rods (1108) are located on the lower surface of the equipment workbench and elastically slide toward both sides, respectively, driving the inner armature rod (1102) to rotate between the rotating shaft (1106) of the support plate (1107) through the rotating cylinder (1105); Step (a3), the inner armature (1102) is connected to the baffle (1103) and moves toward the outside of the external sleeve (1101), so that the baffle (1103) squeezes the spring (1104) located between the baffle (1103) and the outlet of the external sleeve (1101), and the spring (1104) is compressed to generate a certain elastic force; Step (a4), when the guide block (1109) on the inner wall of the locking sleeve (11) moves to the end of the insertion groove (502), the locking sleeve (11) is rotated so that the connecting guide block (1109) moves to the side of the inner buckle groove (503); Step (a5), releasing the force exerted by the hand on the locking sleeve (11), at which time the elastic force generated by the spring (1104) in step (a3) ​​is released, and the spring (1104) stretches, driving the elastic rod (1108) on one side of the inner armature rod (1102) to slide in the opposite direction, thereby completing the fixation between the locking sleeve (11), the fixing buckle (5) and the equipment workbench; Step (B), positioning the arc split surface of the milled casting; Step (b1), placing the workpiece (8) with a milled arc split surface on the upper surface of the support nail plate (301) on one side of the inner yoke plate (3) between the two sets of support enclosure plates (2), so that the middle part of the workpiece (8) passes through the stud (1001) and is connected to the top of the base (1), and the workpiece (8) with a milled arc split surface is placed by supporting the top plate; Step (b2), milling the casting arc split surface workpiece (8) four small flange surfaces on the reverse side of the split surface of the blank, three of which are positioned and aligned, taking into account the sealing groove of the non-machined surface, the inner cavity size and the split surface and the flange, and padding the remaining small flange surfaces, so as to realize the positioning reference with the non-machined surface of the blank; Step (b3), respectively rotating the adjusting screw (6) / the abutting screw (7) so that the adjusting screw (6) / the abutting screw (7) is rotated to one side of the workpiece (8) through the longitudinal adjustment screw hole (201) / the transverse adjustment screw hole (202), thereby achieving longitudinal / lateral position adjustment of the workpiece (8) and positioning of the workpiece (8); Step (b4), sleeve the pressing plate (9) onto the outside of the stud (1001), lock the nut (10) to the upper surface of the pressing plate (9), and complete the fixation of the workpiece (8).

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