An automatic processing device and method for a gas turbine blade

Abstract

The application relates to the technical field of gas turbine blade machining, in particular to an automatic machining device and method for a gas turbine blade. The technical scheme is as follows: a machining table and a mounting frame mounted on the upper end of the machining table are arranged, mounting grooves are arranged on the upper end of the machining table and located on both sides of a conveying belt, clamping mechanisms are arranged in the two mounting grooves and used for positioning workpieces to be machined, and a self-driving lifting mechanism is mounted on the inner wall of the mounting frame. In the application, the self-driving lifting mechanism is started in the process of positioning and clamping, the irregular grinding groove mechanism is extended into the workpiece taper hole to perform grinding machining, and the machining effect is guaranteed; after machining is completed, the two clamping plates are separated, the self-driving lifting mechanism drives the irregular grinding groove mechanism to move upwards, the conveying belt is driven again, the machined workpiece is conveyed to one side, the next workpiece to be machined is continuously conveyed below the irregular grinding groove mechanism, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas turbine blade machining, in particular to an automatic machining device and method for a gas turbine blade. BACKGROUND

[0002] A gas turbine swirler is a key component of a gas turbine, and the gas turbine swirler is usually composed of a central body and a plurality of swirler blades. The central body is located at the center of the swirler and plays a role of guiding airflow, and the swirler blades are arranged in a ring around the central body, and the shape and angle of the swirler blades need to be carefully designed to produce the best swirling effect.

[0003] The circular arc groove in the conical hole of the swirler is relatively deep, and the circular arc groove and the conical hole have an angle relationship, so that the machining direction needs to be accurately controlled during machining. The circular arc groove in the conical hole of the swirler needs to be machined through multiple processes, and polishing is an important link that can improve the use precision of the swirler. The existing machining device is complex and slow in process during the machining of the circular arc groove, and is not suitable for batch production. In view of this, the application provides an automatic machining device and method for a gas turbine blade. SUMMARY

[0004] The application aims to solve the technical problems in the background art and provides an automatic machining device and method for a gas turbine blade.

[0005] The technical scheme of the application is as follows:

[0006] In one aspect, the application provides an automatic machining device for a gas turbine blade, which comprises a machining table and a mounting frame mounted on the upper end of the machining table, and further comprises:

[0007] A conveying belt is arranged on the upper end of the machining table, and mounting grooves are arranged on the upper end of the machining table on both sides of the conveying belt. A clamping mechanism is arranged in the two mounting grooves for positioning a workpiece to be machined.

[0008] A self-driven lifting mechanism is mounted on the inner wall of the mounting frame, and the self-driven lifting mechanism is driven during the positioning of the workpiece by the clamping mechanism.

[0009] The self-driven lifting mechanism comprises a gas control cylinder fixedly connected to the inner wall of the mounting frame, a pneumatic lifting plate is connected to the gas control cylinder, a servo motor is mounted on the bottom end of the pneumatic lifting plate through a connecting rod, and an irregular grinding groove mechanism is mounted on the output end of the servo motor.

[0010] Preferably, the clamping mechanism comprises transmission sliding blocks slidingly connected to the two mounting grooves respectively, and a clamping plate is fixedly connected to one end of each of the two transmission sliding blocks.

[0011] Two transmission blocks are slidably connected in the two mounting grooves, and the two transmission blocks are fixedly connected with the two transmission sliding blocks, respectively.

[0012] Preferably, a bottom groove is formed in the bottom end of the machining table, a bidirectional screw is rotatably connected in the bottom groove, and the two transmission blocks are symmetrically sleeved on the side wall of the bidirectional screw.

[0013] Preferably, the self-driving lifting mechanism further comprises two gas conveying cylinders connected on both sides of the upper end of the gas control cylinder, and the two gas conveying cylinders are in communication with the gas control cylinder.

[0014] A pneumatic piston is slidably connected in each of the two gas conveying cylinders, an L-shaped transmission rod is fixedly connected to the upper end of each of the two transmission sliding blocks, and the other end of each of the two L-shaped transmission rods is fixedly connected with a pneumatic piston.

[0015] Preferably, a first limiting frame is fixedly connected to the inner wall of the gas control cylinder and located below the pneumatic lifting plate, for limiting the pneumatic lifting plate.

[0016] The end of the connecting rod is fixedly connected with a housing, and the servo motor is installed in the housing.

[0017] Preferably, the output shaft of the servo motor is fixedly connected with a rotating shaft, the irregular grinding groove mechanism comprises a conical hammer fixedly connected to one end of the rotating shaft, a cross section is formed on one side of the conical hammer, an abrasive plate is connected to one side of the cross section through a protrusion, and the outer side wall of the abrasive plate is an arc surface.

[0018] Preferably, a buffer groove is formed in the side wall of the cross section, a plurality of return springs are connected to the inner wall of the buffer groove, a supporting cylinder is fixedly connected to the inner peripheral wall of the buffer groove, a sliding plate is slidably connected to the inner wall of the supporting cylinder, the outer end of the sliding plate is fixedly connected with the plurality of return springs, and the protrusion is fixedly connected with the sliding plate.

[0019] Preferably, a second limiting frame is fixedly connected to the outer end of the inner wall of the supporting cylinder, for limiting the sliding plate.

[0020] Preferably, a conveying groove is formed in the upper end of the machining table, a conveying belt is drivingly arranged in the conveying groove, and a plurality of storage grooves are formed in the upper end of the conveying belt.

[0021] On the other hand, the application provides an automatic machining method for a gas turbine blade, comprising the following steps:

[0022] S1, first, place the workpiece to be machined in the storage groove in the upper end of the conveying belt, and transport the workpiece to the lower side of the irregular grinding groove mechanism under the transmission of the conveying belt.

[0023] S2, start the clamping mechanism, make the two transmission sliders move close, and then make the two clamping plates move close to clamp the outer wall of the workpiece below the irregular grinding groove mechanism, complete the positioning of the workpiece. Specifically, the output shaft of the driving motor is rotated to drive the bidirectional screw to rotate, the two transmission blocks are moved close, and finally the two transmission sliders push the two clamping plates to move close, clamp the outer wall of the workpiece, and fix the workpiece below the irregular grinding groove mechanism;

[0024] S3, the self-driven lifting mechanism is driven during the movement of the two transmission sliders, so that the pneumatic lifting plate and the connecting rod are lowered, and then the servo motor, the shaft and the irregular grinding groove mechanism are moved downward, so that the irregular grinding groove mechanism extends into the tapered hole of the workpiece;

[0025] S4, starting the servo motor will drive the conical hammer to rotate, which will rotate in the tapered hole, and the grinding plate will grind the arc groove in the tapered hole at the same time.

[0026] Compared with the prior art, the present application has the following beneficial technical effects:

[0027] The present application can transport the workpiece to be processed to the lower part of the irregular grinding groove mechanism through the transmission of the conveying belt in the conveying groove at the upper end of the machining table, and fix the workpiece under the action of the clamping mechanism. The self-driven lifting mechanism is started during the positioning and clamping process, so that the irregular grinding groove mechanism extends into the tapered hole of the workpiece (cyclone) for grinding. After processing, the two clamping plates move away, the two pneumatic pistons are driven away by the two transmission sliders, the gas control cylinder body is in negative pressure, and then the pneumatic lifting plate and the connecting rod move upward, driving the irregular grinding groove mechanism to move upward and away from the workpiece. The conveying belt is driven again to convey the processed workpiece to one side, and the next workpiece to be processed is conveyed to the lower part of the irregular grinding groove mechanism, thereby improving the processing efficiency.

[0028] By setting the irregular grinding groove mechanism, the irregular grinding groove mechanism includes a conical hammer and a grinding plate arranged on one side of the conical hammer, which can grind the arc groove in the tapered hole of the workpiece (cyclone), and ensure the processing accuracy of the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a perspective view of an automatic processing device for a gas turbine blade;

[0030] Figure 2 is Figure 1 front view of the cross section;

[0031] Figure 3 is Figure 1 right view of the cross section;

[0032] Figure 4 is a bottom view of an automatic processing device for gas turbine blades;

[0033] Figure 5 is Figure 3 is an enlarged structural schematic view of A in FIG. 1;

[0034] Figure 6 is Figure 2 is an enlarged structural schematic view of the irregular grinding groove mechanism in FIG. 1;

[0035] Figure 7 is a schematic view of a processing workpiece structure of an automatic processing device for gas turbine blades.

[0036] The drawing label: 1, processing table; 2, conveying groove; 3, conveying belt; 4, storage groove; 5, mounting groove;

[0037] 6, clamping mechanism; 61, transmission sliding block; 62, clamping plate; 63, transmission block; 64, bidirectional screw; 65, bottom groove; 66, drive motor;

[0038] 7, mounting frame; 8, self-driven lifting mechanism; 81, air cylinder; 82, pneumatic piston; 83, L-shaped transmission rod; 84, pneumatic lifting plate; 85, connecting rod; 86, housing; 87, first limiting frame; 88, air control cylinder;

[0039] 9, servo motor; 10, rotating shaft; 11, irregular grinding groove mechanism; 111, conical hammer; 112, buffer groove; 113, return spring; 114, sliding plate; 115, protrusion; 116, second limiting frame; 117, support cylinder; 119, grinding piece; 120, cross section part. DETAILED DESCRIPTION

[0040] The technical solutions of the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0041] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0042] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0043] EMBODIMENT

[0044] As Figures 1-7As shown, in one aspect, the application provides an automatic processing device for gas turbine blades, which comprises a processing table 1 and a mounting frame 7 mounted on the upper end thereof. The mounting frame 7 is in inverted U-shaped structure, and the two ends of the mounting frame 7 are located at the upper end of the processing table 1 on both sides of the edge. It also includes a conveyor belt 3 arranged on the upper end of the processing table 1. The upper end of the processing table 1 is provided with a conveying groove 2, and the conveying belt 3 is drivingly arranged in the conveying groove 2. The upper end of the conveying belt 3 is provided with a plurality of storage grooves 4. Only part of the schematic diagram of the conveying belt 3 is shown in the figure. The conveying belt 3 is connected with the external transmission mechanism (the transmission mechanism here is a component of the prior art, and the specific structure is not described here). The upper end of the processing table 1 is provided with mounting grooves 5 on both sides of the conveying belt 3. Two mounting grooves 5 are commonly provided with a clamping mechanism 6 for positioning the workpiece to be processed. The inner wall of the mounting frame 7 is provided with a self-driving lifting mechanism 8 which is driven during the positioning of the workpiece by the clamping mechanism 6. The self-driving lifting mechanism 8 comprises a pneumatic cylinder 88 fixedly connected to the inner wall of the mounting frame 7. The pneumatic cylinder 88 is pneumatically connected with a pneumatic lifting plate 84. The bottom end of the pneumatic lifting plate 84 is provided with a servo motor 9 through a connecting rod 85. The output end of the servo motor 9 is provided with an irregular grinding groove mechanism 11.

[0045] Specifically, the clamping mechanism 6 comprises transmission sliding blocks 61 slidingly connected in the two mounting grooves 5 respectively. The ends of the two transmission sliding blocks 61 close to each other are fixedly connected with clamping plates 62. The inner arc surface of the clamping plate 62 matches the outer arc surface of the workpiece. Transmission blocks 63 are slidingly connected in the two mounting grooves 5 respectively. The two transmission blocks 63 are fixedly connected with the two transmission sliding blocks 61 respectively. The inner walls of the two mounting grooves 5 are provided with sliding grooves. The two transmission blocks 63 are slidingly connected in the two sliding grooves respectively. The bottom end of the processing table 1 is provided with a bottom groove 65. The bottom groove 65 is rotatably connected with a bidirectional screw 64. The two transmission blocks 63 are symmetrically and drivingly sleeved on the side wall of the bidirectional screw 64. The side wall of the processing table 1 is provided with a drive motor 66 for driving the bidirectional screw 64. The drive motor 66 is electrically connected with an external controller. When the workpiece (cyclone) needs to be positioned, the drive motor 66 is started. The output shaft of the drive motor 66 rotates to drive the bidirectional screw 64 to rotate. The rotation of the bidirectional screw 64 drives the two transmission blocks 63 to move close to each other, and then drives the two transmission sliding blocks 61 to slide close to each other, and finally makes the two clamping plates 62 close to each other and clamp the outer wall of the workpiece (cyclone).

[0046] Further, the self-driven lifting mechanism 8 further comprises two gas conveying cylinders 81 connected on both sides of the upper end of the gas control cylinder 88, both of which are in communication with the gas control cylinder 88; both of the gas conveying cylinders 81 are slidably connected with pneumatic pistons 82, the upper ends of both of the transmission sliding blocks 61 are fixedly connected with L-shaped transmission rods 83, and the other ends of both of the L-shaped transmission rods 83 are fixedly connected with the two pneumatic pistons 82 respectively. It should be noted that the inner wall of the gas control cylinder 88 is fixedly connected with a first limiting frame 87 located below the pneumatic lifting plate 84, which is used for limiting the pneumatic lifting plate 84 and preventing the pneumatic lifting plate 84 from being separated from the gas control cylinder 88 under the action of gas pressure. The end of the connecting rod 85 is fixedly connected with a shell 86, and the servo motor 9 is installed in the shell 86, thereby improving the stability of the installation of the servo motor 9.

[0047] In the embodiment, the output shaft of the servo motor 9 is fixedly connected with a rotating shaft 10, the irregular grinding groove mechanism 11 comprises a conical hammer 111 fixedly connected at one end of the rotating shaft 10, one side of the conical hammer 111 is provided with a cross section part 120, one side of the cross section part 120 is telescopically connected with a grinding piece 119 through a protruding block 115, and the outer side wall of the grinding piece 119 is an arc surface. The side wall of the cross section part 120 is provided with a buffer groove 112, the inner wall of the buffer groove 112 is fixedly connected with a plurality of return springs 113, the inner peripheral wall of the buffer groove 112 is fixedly connected with a supporting cylinder 117, and the inner wall of the supporting cylinder 117 is slidably connected with a sliding plate 114. The outer end inner wall of the supporting cylinder 117 is fixedly connected with a second limiting frame 116 for limiting the sliding plate 114. The sliding plate 114 is prevented from being separated from the supporting cylinder 117 under the elastic force of the return springs 113. The sliding plate 114 is fixedly connected with the outer ends of the plurality of return springs 113, and the protruding block 115 is fixedly connected with the sliding plate 114. When the conical hammer 111 extends into the conical hole of the workpiece (cyclone), the outer arc surface of the conical hammer 111 contacts the inner wall of the conical hole; when the conical hammer 111 rotates to complete the grinding of the conical hole, when the grinding piece 119 moves to the circular arc groove in the conical hole, the sliding plate 114 slides towards the outer end of the supporting cylinder 117 under the rebounding force of the plurality of return springs 113, and then the grinding piece 119 is driven by the protruding block 115 to extend into the circular arc groove to grind the inner wall of the circular arc groove. When the conical hammer 111 continues to rotate, the grinding piece 119 moves out of the circular arc groove and presses the plurality of return springs 113 to retract, and the grinding piece 119 slides in contact with the inner wall of the conical hole.

[0048] On the other hand, the application provides an automatic processing method for a gas turbine blade, comprising the following steps:

[0049] S1, first, the workpiece to be processed is placed in the storage groove 4 at the upper end of the conveying belt 3, the external transmission mechanism is started, the conveying belt 3 is operated, and the workpiece is transported to the lower side of the irregular grinding groove mechanism 11 under the transmission of the conveying belt 3, and the conveying belt 3 is temporarily stopped.

[0050] S2, the clamping mechanism 6 is started, the two transmission sliding blocks 61 are moved close, and then the two clamping plates 62 are moved close to clamp the outer wall of the workpiece below the irregular grinding groove mechanism 11, and the positioning of the workpiece is completed. Specifically, the external controller starts the drive motor 66, the output shaft of the drive motor 66 rotates to drive the bidirectional screw 64 to rotate, the bidirectional screw 64 rotates to drive the two transmission blocks 63 to move close, and finally the two transmission sliding blocks 61 push the two clamping plates 62 to move close, clamp the outer wall of the workpiece (cyclone), and fix the workpiece (cyclone) below the irregular grinding groove mechanism 11.

[0051] S3, the self-driven lifting mechanism 8 will be driven during the movement of the two transmission sliding blocks 61, the pneumatic lifting plate 84 and the connecting rod 85 are lowered, the next step is to move the servo motor 9, the shaft 10 and the irregular grinding groove mechanism 11 downward, so that the irregular grinding groove mechanism 11 extends into the tapered hole of the workpiece; the specific driving principle of the self-driven lifting mechanism 8 is that the two transmission sliding blocks 61 move close to drive the two L-shaped transmission rods 83 to move close, the two pneumatic pistons 82 are pushed to slide close to the gas control cylinder body 88 in the two gas cylinders 81 respectively through the two L-shaped transmission rods 83, the gas in the two gas cylinders 81 is pushed into the gas control cylinder body 88, under the action of gas pressure, the pneumatic lifting plate 84 in the gas control cylinder body 88 slides downward, and then the shell 86 and the servo motor 9 are moved downward through the connecting rod 85, and finally the irregular grinding groove mechanism 11 is lowered to extend into the tapered hole of the workpiece (cyclone) between the two clamping plates 62, and the outer wall of the conical hammer 111 contacts the inner wall of the tapered hole.

[0052] S4, the servo motor 9 is started to drive the conical hammer 111 to rotate through the rotating shaft 10, the conical hammer 111 will rotate in the taper hole and polish the inner wall of the taper hole, when the conical hammer 111 rotates, the grinding piece 119 will move in a circle, when the grinding piece 119 moves to the circular groove in the taper hole, under the elastic force of the plurality of return springs 113, the sliding plate 114 will move to the outer end of the supporting cylinder 117, and then the grinding piece 119 will be driven by the protruding block 115 to extend into the circular groove, the outer arc surface of the grinding piece 119 matches the size of the circular groove, so that the circular groove can be polished to ensure the machining precision of the circular groove, when the grinding piece 119 rotates away from the circular groove, the grinding piece 119 slides with the inner wall of the taper hole (the plurality of return springs 113 retract a certain distance, so that the grinding piece 119 can rotate smoothly with the conical hammer 111), the machining of the workpiece is completed. Next, the output shaft of the driving motor 66 is reversed to drive the two transmission sliding blocks 61 to pull the two clamping plates 62 away from each other, so as to abandon the clamping of the machined workpiece, the two transmission sliding blocks 61 move away, which drives the two L-shaped transmission rods 83 to move away, and then pulls the two pneumatic pistons 82 to move away, so that the gas in the gas control cylinder body 88 is sucked into the two gas conveying cylinders 81, the gas control cylinder body 88 is in negative pressure, and then the pneumatic lifting plate 84 slides upward, and finally the irregular grinding groove mechanism 11 rises upward and leaves the machined taper hole. Next, the transmission mechanism is started again to make the machined workpiece conveyed to the other side of the irregular grinding groove mechanism 11 through the conveying belt 3, and the next workpiece to be machined is conveyed to the lower side of the irregular grinding groove mechanism 11, and the machining is continued through the above steps.

[0053] The above specific embodiments are only preferred embodiments of the present application, and based on the technical solutions of the present application and the related inspiration of the above embodiments, those skilled in the art can make various alternative improvements and combinations on the above specific embodiments; the above specific embodiments are only an explanation of the present application, and are not a limitation of the present application.

Claims

1. An automatic processing device for gas turbine blades, comprising a processing table (1) and a mounting frame (7) mounted on the upper end thereof, characterized in that, Also include: The upper end of the processing table (1) is provided with a conveying belt (3), the upper end of the processing table (1) is provided with a mounting groove (5) on both sides of the conveying belt (3), two mounting grooves (5) are provided with a clamping mechanism (6) in common, for positioning the workpiece to be processed; The inner wall of the mounting frame (7) is provided with a self-driving lifting mechanism (8), which is driven by the self-driving lifting mechanism (8) during the process of positioning the workpiece by the clamping mechanism (6); The self-driving lifting mechanism (8) includes a gas control cylinder (88) fixedly connected to the inner wall of the mounting frame (7), a pneumatic lifting plate (84) pneumatically connected in the gas control cylinder (88), a servo motor (9) mounted on the bottom end of the pneumatic lifting plate (84) through a connecting rod (85), and an irregular grinding groove mechanism (11) mounted on the output end of the servo motor (9); The clamping mechanism (6) includes two transmission sliding blocks (61) slidingly connected in the two mounting grooves (5) respectively, and the two transmission sliding blocks (61) are fixedly connected with clamping plates (62) on the side close to each other; Two transmission blocks (63) are slidably connected in the two mounting grooves (5), and the two transmission blocks (63) are fixedly connected with the two transmission sliding blocks (61) respectively; The self-driving lifting mechanism (8) further includes two gas cylinders (81) connected on both sides of the upper end of the gas control cylinder (88), and the two gas cylinders (81) are in communication with the gas control cylinder (88); Two pneumatic pistons (82) are slidably connected in the two gas cylinders (81), and the upper ends of the two transmission sliding blocks (61) are fixedly connected with two L-shaped transmission rods (83), and the other ends of the two L-shaped transmission rods (83) are fixedly connected with the two pneumatic pistons (82) respectively; The inner wall of the gas control cylinder (88) is fixedly connected with a first limiting frame (87) below the pneumatic lifting plate (84) for limiting the pneumatic lifting plate (84); The end of the connecting rod (85) is fixedly connected with a shell (86), and the servo motor (9) is mounted in the shell (86); The output shaft of the servo motor (9) is fixedly connected with a rotating shaft (10), the irregular grinding groove mechanism (11) includes a conical hammer (111) fixedly connected to one end of the rotating shaft (10), one side of the conical hammer (111) is provided with a cross section part (120), one side of the cross section part (120) is connected with a grinding piece (119) through a protruding block (115), and the outer side wall of the grinding piece (119) is an arc surface; The side wall of the cross section part (120) is provided with a buffer groove (112), the inner wall of the buffer groove (112) is connected with a plurality of return springs (113), the inner peripheral wall of the buffer groove (112) is fixedly connected with a supporting cylinder (117), the inner wall of the supporting cylinder (117) is slidably connected with a sliding plate (114), the sliding plate (114) is fixedly connected with the outer ends of the plurality of return springs (113), and the protruding block (115) is fixedly connected with the sliding plate (114). The outer end inner wall of the support cylinder (117) is fixedly connected with a second limiting frame (116) for limiting the sliding plate (114).

2. An apparatus for automatically machining a gas turbine blade according to claim 1, wherein The bottom end of the processing table (1) is provided with a bottom groove (65), the bottom groove (65) is rotationally connected with a bidirectional screw (64), two transmission blocks (63) are symmetrically arranged on the sidewall of the bidirectional screw (64), and the sidewall of the processing table (1) is provided with a driving motor (66) for driving the bidirectional screw (64).

3. An apparatus for automatically machining a gas turbine blade according to claim 1, wherein The upper end of the processing table (1) is provided with a conveying groove (2), the conveying belt (3) is arranged in the conveying groove (2) in a transmission mode, and the upper end of the conveying belt (3) is provided with a plurality of storage grooves (4).

4. A method for automatically processing a gas turbine blade, applied to the apparatus for automatically processing a gas turbine blade according to claim 1, characterized by, The method comprises the following steps: S1, first, the workpiece to be processed is placed in the storage groove (4) at the upper end of the conveying belt (3), and the workpiece is transported to the lower side of the irregular grinding groove mechanism (11) under the transmission of the conveying belt (3); S2, the clamping mechanism (6) is started, the two transmission sliding blocks (61) are moved close to each other, and then the two clamping plates (62) are moved close to each other and clamped on the outer wall of the workpiece below the irregular grinding groove mechanism (11), so that the positioning of the workpiece is completed; S3, the self-driven lifting mechanism (8) is driven during the close movement of the two transmission sliding blocks (61), so that the pneumatic lifting plate (84) and the connecting rod (85) are lowered, and then the servo motor (9), the rotating shaft (10) and the irregular grinding groove mechanism (11) are moved downward, so that the irregular grinding groove mechanism (11) extends into the tapered hole of the workpiece; S4, starting the servo motor (9) will drive the tapered hammer (111) to rotate, the tapered hammer (111) will rotate in the tapered hole, and the grinding piece (119) will grind the arc groove in the tapered hole while the tapered hammer (111) rotates.

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