Ultra-deep hole precision boring cutter machining method and high-precision hole machining method

Abstract

The invention relates to the technical field of machining, in particular to an ultra-deep hole precision boring cutter machining method and a high-precision hole machining method.The ultra-deep hole precision boring cutter machining method comprises the following steps that firstly, a cutter blank is placed at a clamp, the clamp is used for fixing a cutter, programming data is imported into a machine tool, and the cutter blank is processed; the surface of the tool blank is cut through the machine tool; and secondly, a drilling machine is used for conducting punching operation on the inner wall of the chip discharging groove of the machined boring cutter, tapping operation is conducted on the interior of a hole after punching is conducted, and it is guaranteed that the first blade can be fixed to the boring cutter through a bolt. According to the clamp, the ratchet wheel can only rotate forwards and cannot rotate backwards, so that the V-shaped fixed clamping jaw is tighter and tighter and cannot loosen, manual operation is not needed, time and labor are saved, the phenomenon that the clamp disc is not tightened, the clamp cannot loosen and a rough blank cannot loosen is avoided, the cutter collision phenomenon cannot occur when the rough blank is machined, and a cutter and the rough blank are prevented from being scrapped.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a method for machining ultra-deep holes with precision boring tools and a method for machining high-precision holes. Background Technology

[0002] Boring is a machining process that uses a cutting tool to enlarge the inner diameter of a hole or other circular contour. Its application range is generally from semi-roughing to finishing, and the cutting tool used is usually a single-edged boring bar.

[0003] Under normal circumstances, it is difficult to effectively process high-precision through holes or blind holes with a length-to-diameter ratio greater than 8 and a hole accuracy of IT6 using conventional hole reaming methods on ordinary equipment. There are several reasons for this. First, the equipment has low precision and poor rigidity. Second, the existing conventional tools on ordinary equipment have poor rigidity, making it difficult to control the cutting quality and basically unable to meet the special product quality requirements. Third, when using other special structure tools such as reamers and extrusion tools on ordinary equipment, there are very high requirements for the semi-finishing quality of the hole, such as the allowance for finishing, the cylindricity and roughness of the hole. At the same time, there are also very high requirements for the quality of the workpiece blank and the quality of heat treatment.

[0004] In existing boring tool machining methods, when fixing the rough workpiece with a fixture, the fixture plate is usually tightened manually. If the fixture plate is not tightened due to human error, the fixture will become loose, causing the rough workpiece to become loose. This will cause the tool to collide during the rough workpiece machining process, resulting in the scrapping of both the tool and the rough workpiece. Summary of the Invention

[0005] Therefore, the present invention provides a method for machining ultra-deep holes with precision boring tools and a method for machining high-precision holes to solve the above-mentioned problems.

[0006] This invention provides the following technical solution: a method for machining ultra-deep holes with precision boring tools, comprising the following steps: Step 1: Place the tool blank in the fixture and use the fixture to fix the tool. Import the programming data into the machine tool and then use the machine tool to cut the surface of the tool blank. Step 2: Using a drilling machine, drill holes in the inner wall of the chip groove of the machined boring bar. After drilling, tap the holes to ensure that the first insert can be fixed to the boring bar with bolts. Then, fix the second insert to the first insert with bolts. Step 3: Complete the machining and assembly of the cutting tools.

[0007] As a preferred embodiment of the present invention, the fixture includes a first fixture platform, a CNC machine tool is fixedly mounted on the bottom of the first fixture platform, a first support plate is fixedly connected to both the left and right sides of the first fixture platform, and a second fixture platform is fixedly connected to the inner side of the first support plate.

[0008] As a preferred embodiment of the present invention, a clamping frame is fixedly connected to the inner wall of the second clamping table, a sliding groove is provided at the bottom of the clamping frame, a movable platform is slidably connected to the groove wall of the sliding groove, a movable ring is fixedly connected to the outer wall of the movable platform, toothed plates are fixedly connected to the left and right sides of the surface of the movable ring, a limit groove is provided through the top of the second clamping table, and a fourth support plate is fixedly connected to the inner side of the first support plate.

[0009] In a preferred embodiment of the present invention, a second support plate is fixedly connected to the bottom of the second fixture platform, a screw is rotatably connected to the inner wall of the second support plate, a first synchronous wheel is fixedly connected to the surface of the screw, a movable plate is threadedly connected to the surface of the screw, the groove wall of the limiting groove is slidably connected to the surface of the movable plate, a third support plate is fixedly connected to the top of the movable plate, a V-shaped fixing claw is fixedly connected to the inner side of the third support plate, a fifth support plate is fixedly connected to the top of the fourth support plate, a first rotating rod is rotatably connected to the inner wall of the fifth support plate, a gear is fixedly connected to the inner end of the first rotating rod, and the gear meshes with a gear plate.

[0010] As a preferred embodiment of the present invention, a second synchronous pulley is fixedly connected to the surface of the first rotating rod, and a synchronous belt is sleeved on the surface of the first and second synchronous pulleys. There are two of each of the second synchronous pulley, the first synchronous pulley, and the synchronous belt, and the two second synchronous pulleys, the first synchronous pulley, and the synchronous belt are symmetrically distributed from left to right.

[0011] As a preferred embodiment of the present invention, a ratchet is fixedly connected to the outer end of the first rotating rod, a sixth support plate is fixedly connected to the top of the fourth support plate, a second rotating rod is fixedly connected to the inner side of the sixth support plate, a pawl is rotatably connected to the surface of the second rotating rod, a first connecting rod is fixedly connected to the inner side of the pawl, a second connecting rod is fixedly connected to the inner side of the sixth support plate, a tension spring is fixedly connected to the surface of the first connecting rod, and the end of the tension spring away from the first connecting rod is fixedly connected to the surface of the second connecting rod.

[0012] As a preferred embodiment of the present invention, the ratchet and the pawl engage in a one-way manner.

[0013] As a preferred embodiment of the present invention, the number of the second support plates is four, with two second support plates located on the left side of the bottom of the second fixture table. The two second support plates form a group, and the two groups of second support plates are symmetrically distributed from left to right. The number of the screw, the moving plate, the third support plate, the V-shaped fixed gripper, the fifth support plate, the first rotating rod, and the gear is two, and the two screws, the moving plate, the third support plate, the V-shaped fixed gripper, the fifth support plate, the first rotating rod, and the gear are symmetrically distributed from left to right.

[0014] In a preferred embodiment of the present invention, the number of ratchet, fourth support plate, sixth support plate, second rotating pawl, first connecting rod, tension spring and second connecting rod are all two, and the two ratchet, fourth support plate, sixth support plate, second rotating pawl, first connecting rod, tension spring and second connecting rod are symmetrically distributed from left to right.

[0015] A high-precision hole machining method includes the following steps: Step 1: The boring tool is precisely installed and adjusted. A special tool adjustment device is used to ensure that the center of the boring tool is completely aligned with the rotation center of the boring machine spindle. Even a small deviation can cause cylindricity errors in the machined hole. Step 2: Determine that the tool extension length is greater than 8 and not greater than 8.2. Step 3: Based on the size, position, and accuracy requirements of the holes, write a detailed machining program. For machining multiple holes, rationally plan the machining sequence to reduce tool idle travel time and improve machining efficiency. Step four: Use a suitable pecking-drilling machining method, that is, the boring bar cuts in segments, and withdraws from the hole after each cut to a certain depth to allow for chip removal and cooling, and then continues cutting. This effectively prevents chips from accumulating in the hole and ensures machining accuracy. Step 5: Using sensors installed on the machine tool, the temperature, vibration and other parameters of the machine tool are monitored in real time, and the CNC system compensates and adjusts the movement of the tool based on this data; Step six: After the hole is machined, high-precision measuring tools are used to inspect the size, shape and surface quality of the hole. If deviations are found to exceed the tolerance range, the cause will be analyzed and adjustments will be made in a timely manner to ensure that the holes of each part meet the high-precision requirements.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the blank is placed on a moving table. Under its own weight, the blank descends, pushing the moving table downwards, which in turn lowers the gear plate, causing the gears to rotate. This causes the first rotating rod to rotate the second synchronous wheel and ratchet. The ratchet is limited by the pawl and tension spring, allowing it to rotate only forward. When the second synchronous wheel rotates forward, the timing belt causes the first synchronous wheel to rotate forward, driving the screw to rotate. The limiting groove causes the two second support plates to move inwards synchronously, allowing the V-shaped fixing pawl to center and fix the blank. Since the ratchet can only rotate forward, the V-shaped fixing pawl will only tighten, preventing loosening. This eliminates the need for manual operation, saving time and effort. It also prevents issues such as loose clamping plates, loose clamps, and loose blanks, preventing tool collisions during blank processing and avoiding the scrapping of tools and blanks. Attached Figure Description

[0017] Figure 1 This is a flowchart of the ultra-deep hole precision boring tool machining method of the present invention; Figure 2 This is a flowchart of the high-precision hole machining method in this invention; Figure 3 This is a schematic diagram of the fixture component structure in this invention; Figure 4 This is a partial structural diagram of the clamp component in this invention; Figure 5 This is a bottom view of a partial structure of the clamp component in this invention; Figure 6 This is a schematic diagram of the automatic clamping component structure in this invention; Figure 7 This is an enlarged view of the self-locking structure in this invention; Figure 8 This is a schematic diagram of the boring tool structure in this invention.

[0018] In the diagram: 1. CNC machine tool; 2. Fixture; 3. Boring tool; 4. Second insert; 5. First insert; 6. Chip chute; 201. First fixture table; 202. First support plate; 203. Fourth support plate; 204. Second fixture table; 205. Limiting groove; 206. Fixture frame; 207. Slide groove; 208. Second support plate; 209. Moving plate; 210. Third support plate; 211. V-shaped fixed jaw; 21 2. Screw; 213. First synchronous pulley; 214. Synchronous belt; 215. Sixth support plate; 216. Fifth support plate; 217. Gear; 218. First rotating rod; 219. Second synchronous pulley; 220. Ratchet; 221. Second rotating rod; 222. Second connecting rod; 223. Tension spring; 224. Claw; 225. First connecting rod; 226. Moving ring; 227. Gear plate; 228. Moving table. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-8 The technical solution provided by this invention specifically includes the following embodiments: Example 1: A method for machining ultra-deep holes with precision boring tools, comprising the following steps: Step 1: Place the tool blank in fixture 2 and use fixture 2 to fix the tool. Import the programming data into the machine tool and then use the machine tool to cut the surface of the tool blank. The boring bar 3 is made of tungsten-based alloy, which is manufactured using powder metallurgy technology. High-purity metal powders such as tungsten, nickel, iron, and copper are typical elements for sintering various alloys. Some of these alloys can be used to make boring bar holders and other tool holders. Typical tungsten-based high-density alloy grades used to make boring bar holders are K1700 and K1800. When boring bar holders made from these alloys are used for boring with the same cutting parameters, their deflection can be reduced by 50% to 60% compared to steel tool holders of the same diameter and overhang. Step 2: Using a drilling machine, drill holes in the inner wall of the chip groove 6 of the machined boring bar 3. After drilling, tap the holes to ensure that the first insert 5 can be fixed to the boring bar 3 with bolts. Then, fix the second insert 4 to the first insert 5 with bolts. The second insert 4 is made of polycrystalline cubic boron nitride, which is second only to PCD in hardness. Polycrystalline cubic boron nitride inserts are commonly used for precision boring of hardened steel, tool steel, high-speed steel, gray cast iron, chilled cast iron, and powder metallurgy materials. A unique property of polycrystalline cubic boron nitride is that its room temperature hardness is basically the same as its high temperature hardness during cutting. This allows polycrystalline cubic boron nitride tools to achieve a longer tool life than other types of tools for machining the same workpiece in high-speed machining. Step 3: Complete the machining and assembly of the cutting tools.

[0021] The fixture 2 includes a first fixture table 201, with a CNC machine tool 1 fixedly mounted on the bottom of the first fixture table 201. First support plates 202 are fixedly connected to both the left and right sides of the first fixture table 201. A second fixture table 204 is fixedly connected to the inner side of the first support plate 202. A fixture frame 206 is fixedly connected to the inner wall of the second fixture table 204. A sliding groove 207 is provided at the bottom of the fixture frame 206. A movable stage 228 is slidably connected to the groove wall of the sliding groove 207. A movable ring 226 is fixedly connected to the outer wall of the movable stage 228. Toothed plates 227 are fixedly connected to both the left and right sides of the surface of the movable ring 226. A limit groove 205 is provided through the top of the second fixture table 204. A fourth support plate is fixedly connected to the inner side of the first support plate 202. 203. A second support plate 208 is fixedly connected to the bottom of the second fixture table 204. A screw 212 is rotatably connected to the inner wall of the second support plate 208. A first synchronous wheel 213 is fixedly connected to the surface of the screw 212. A moving plate 209 is threadedly connected to the surface of the screw 212. The groove wall of the limiting groove 205 is slidably connected to the surface of the moving plate 209. A third support plate 210 is fixedly connected to the top of the moving plate 209. A V-shaped fixing claw 211 is fixedly connected to the inner side of the third support plate 210. A fifth support plate 216 is fixedly connected to the top of the fourth support plate 203. A first rotating rod 218 is rotatably connected to the inner wall of the fifth support plate 216. A gear 217 is fixedly connected to the inner end of the first rotating rod 218. 7 meshes with toothed plate 227. A second synchronous pulley 219 is fixedly connected to the surface of the first rotating rod 218. A synchronous belt 214 is fitted onto the surfaces of the first synchronous pulley 213 and the second synchronous pulley 219. There are two of each of the two synchronous pulleys 219, 213, and 214, which are symmetrically distributed from left to right. A ratchet 220 is fixedly connected to the outer end of the first rotating rod 218. A sixth support plate 215 is fixedly connected to the top of the fourth support plate 203. A second rotating rod 221 is fixedly connected to the inner side of the sixth support plate 215. A pawl 224 is rotatably connected to the surface of the second rotating rod 221. A first connecting rod is fixedly connected to the inner side of the pawl 224. 225. A second connecting rod 222 is fixedly connected to the inner side of the sixth support plate 215. A tension spring 223 is fixedly connected to the surface of the first connecting rod 225. The end of the tension spring 223 away from the first connecting rod 225 is fixedly connected to the surface of the second connecting rod 222. The ratchet 220 engages unidirectionally with the pawl 224. There are four second support plates 208. Two second support plates 208 are located on the left side of the bottom of the second clamping table 204. Two second support plates 208 form a group, and the two groups of second support plates 208 are symmetrically distributed from left to right. There are two screws 212, two moving plates 209, two third support plates 210, two V-shaped fixed pawls 211, two fifth support plates 216, two first rotating rods 218, and two gears 217.Two screws 212, a movable plate 209, a third support plate 210, a V-shaped fixing jaw 211, a fifth support plate 216, a first rotating rod 218, and a gear 217 are symmetrically distributed from left to right. Two ratchet wheels 220, two fourth support plates 203, two sixth support plates 215, two second rotating rods 221, two jaws 224, one first connecting rod 225, one tension spring 223, and one second connecting rod 222 are also present.

[0022] By placing the billet on the moving table 228, the billet, under its own weight, is in a downward phase, causing the moving table 228 to descend. This, in turn, causes the gear plate 227 to descend, resulting in the rotation of the gear 217. This, in turn, causes the first rotating rod 218 to drive the second synchronous pulley 219 and the ratchet 220 to rotate. The pawl 224 and tension spring 223 limit the ratchet 220 to rotate only forward, not backward. When the second synchronous pulley 219 rotates forward, the timing belt 214 causes the first synchronous pulley 219 to rotate forward as well. 13 rotates forward, driving the screw 212 to rotate. Through the limiting groove 205, the two second support plates 208 move inward synchronously, so that the V-shaped fixed jaw 211 fixes the rough blank in the center. The ratchet 220 can only rotate forward and not backward, so the V-shaped fixed jaw 211 will only become tighter and tighter and will not loosen. No manual operation is required, saving time and effort. There will be no problem of the clamping plate not being tightened, the clamping will not loosen, and the rough blank will not loosen. During the processing of the rough blank, there will be no collision phenomenon, avoiding the scrapping of the tool and the rough blank.

[0023] On the other hand, this application also provides a high-precision hole machining method, including the following steps: Step 1: The boring bar 3 is precisely installed and adjusted. A special tool adjustment device is used to ensure that the center of the boring bar is completely aligned with the rotation center of the boring machine spindle. Even a small deviation can cause cylindricity errors in the machined hole. The tool adjustment device is a tool pre-adjustment instrument, which is a measuring device that can pre-adjust and measure the tool tip diameter and clamping length, and input tool data into the machining program; Step 2: Determine that the tool extension length is greater than 8 and not greater than 8.2. Step 3: Based on the size, position, and accuracy requirements of the holes, write a detailed machining program. For machining multiple holes, rationally plan the machining sequence to reduce tool idle travel time and improve machining efficiency. Step four: Use a suitable pecking-drilling machining method, that is, the boring bar is cut in three segments. After each cut to a certain depth, the boring bar is withdrawn from the hole to allow for chip removal and cooling, and then cutting continues. This effectively prevents chips from accumulating in the hole and ensures machining accuracy. Step 5: Using sensors installed on the machine tool, the temperature, vibration and other parameters of the machine tool are monitored in real time, and the CNC system compensates and adjusts the movement of the tool based on this data; Step six: After the hole is machined, high-precision measuring tools are used to inspect the size, shape and surface quality of the hole. If deviations are found to exceed the tolerance range, the cause will be analyzed and adjustments will be made in a timely manner to ensure that the holes of each part meet the high-precision requirements.

[0024] Working Principle: This solution describes a method for machining ultra-deep hole precision boring tools and a high-precision hole machining method. First, the tool blank is placed in a fixture and fixed. The programming data is then imported into the machine tool, which performs cutting on the surface of the tool blank. Next, a drilling machine is used to drill holes in the inner wall of the chip groove of the machined boring tool. After drilling, tapping is performed in the holes to ensure that the first insert can be bolted to the boring tool. Then, the second insert is bolted to the first insert, completing the tool machining and assembly. In the stage of fixing the blank, the blank is placed on the moving table 228. At this time, the blank is in the descending stage due to its own weight, which pushes the moving table 228 to descend, causing the gear plate 227 to descend, which in turn causes the gear 217 to rotate. This causes the first rotating rod 218 to drive the second synchronous pulley 219 and the ratchet 220 to rotate. The ratchet 220 can only rotate forward and not backward due to the limiting effect of the pawl 224 and the tension spring 223. When the second synchronous pulley 219 rotates forward, the timing belt 214 causes the ratchet 220 to rotate. The first synchronous wheel 213 rotates forward, driving the screw 212 to rotate. Through the limiting groove 205, the two second support plates 208 move inward synchronously, so that the V-shaped fixed jaw 211 fixes the blank in the center. The ratchet 220 can only rotate forward and not backward, so the V-shaped fixed jaw 211 will only tighten and will not loosen. No manual operation is required, saving time and effort. There will be no problem of the clamping plate not being tightened, the clamping will not loosen, and the blank will not loosen. During the processing of the blank, there will be no collision phenomenon, avoiding the scrapping of the tool and the blank. In addition, the assembled boring bar 3 is precisely installed and adjusted. A dedicated tool adjustment device ensures that the center of the boring bar is perfectly aligned with the rotation center of the boring machine spindle, as even minute deviations can lead to cylindricity errors in the machined holes. The tool extension length is determined to be greater than 8 mm and no greater than 8.2 mm. Detailed machining programs are written based on the hole size, position, and accuracy requirements. For machining multiple holes, the machining sequence is rationally planned to reduce tool idle travel time and improve machining efficiency. A suitable pecking-drilling machining method is adopted, where the boring bar 3 cuts in segments, withdrawing from the hole after each cut to a certain depth for chip removal and cooling before continuing cutting. This effectively prevents chip accumulation in the hole and ensures machining accuracy. Sensors installed on the machine tool monitor parameters such as temperature and vibration in real time, and the CNC system compensates and adjusts the tool movement based on this data. After hole machining, high-precision measuring tools are used to inspect the hole's size, shape, and surface quality. If deviations exceed tolerances, the cause is analyzed and adjustments are made promptly to ensure that the holes on each part meet high-precision requirements.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for machining ultra-deep holes with precision boring tools, characterized in that: Includes the following steps: Step 1: Place the tool blank in the fixture (2) and fix the tool with the fixture (2). Import the programming data into the machine tool and then use the machine tool to cut the surface of the tool blank. Step 2: Using a drilling machine, drill holes in the inner wall of the chip groove (6) of the processed boring bar (3). After drilling, tap the holes to ensure that the first cutting tool (5) can be fixed on the boring bar (3) with bolts. Then fix the second cutting tool (4) on the first cutting tool (5) with bolts. Step 3: Complete the machining and assembly of the cutting tools.

2. The method for machining ultra-deep holes with precision boring tools according to claim 1, characterized in that: The fixture (2) includes a first fixture table (201), a CNC machine tool (1) is fixedly mounted on the bottom of the first fixture table (201), a first support plate (202) is fixedly connected to both the left and right sides of the first fixture table (201), and a second fixture table (204) is fixedly connected to the inner side of the first support plate (202).

3. The method for machining ultra-deep hole precision boring tools according to claim 2, characterized in that: The inner wall of the second fixture table (204) is fixedly connected to a fixture frame (206). The bottom of the fixture frame (206) is provided with a sliding groove (207). The groove wall of the sliding groove (207) is slidably connected to a moving platform (228). The outer wall of the moving platform (228) is fixedly connected to a moving ring (226). The left and right sides of the surface of the moving ring (226) are fixedly connected to toothed plates (227). The top of the second fixture table (204) is provided with a limit groove (205). The inner side of the first support plate (202) is fixedly connected to a fourth support plate (203).

4. The method for machining ultra-deep holes with precision boring tools according to claim 3, characterized in that: The bottom of the second fixture table (204) is fixedly connected to a second support plate (208). The inner wall of the second support plate (208) is rotatably connected to a screw (212). The surface of the screw (212) is fixedly connected to a first synchronous wheel (213). The surface of the screw (212) is threadedly connected to a moving plate (209). The groove wall of the limiting groove (205) is slidably connected to the surface of the moving plate (209). The top of the moving plate (209) is fixedly connected to a third support plate (210). The inner side of the third support plate (210) is fixedly connected to a V-shaped fixing claw (211). The top of the fourth support plate (203) is fixedly connected to a fifth support plate (216). The inner wall of the fifth support plate (216) is rotatably connected to a first rotating rod (218). The inner end of the first rotating rod (218) is fixedly connected to a gear (217). The gear (217) meshes with a toothed plate (227).

5. The method for machining ultra-deep hole precision boring tools according to claim 4, characterized in that: The surface of the first rotating rod (218) is fixedly connected to a second synchronous pulley (219). The surfaces of the first synchronous pulley (213) and the second synchronous pulley (219) are fitted with a synchronous belt (214). There are two of each of the second synchronous pulley (219), the first synchronous pulley (213) and the synchronous belt (214). The two second synchronous pulleys (219), the first synchronous pulley (213) and the synchronous belt (214) are symmetrically distributed from left to right.

6. The method for machining ultra-deep hole precision boring tools according to claim 4, characterized in that: A ratchet (220) is fixedly connected to the outer end of the first rotating rod (218). A sixth support plate (215) is fixedly connected to the top of the fourth support plate (203). A second rotating rod (221) is fixedly connected to the inner side of the sixth support plate (215). A pawl (224) is rotatably connected to the surface of the second rotating rod (221). A first connecting rod (225) is fixedly connected to the inner side of the pawl (224). A second connecting rod (222) is fixedly connected to the inner side of the sixth support plate (215). A tension spring (223) is fixedly connected to the surface of the first connecting rod (225). The end of the tension spring (223) away from the first connecting rod (225) is fixedly connected to the surface of the second connecting rod (222).

7. The method for machining ultra-deep holes with precision boring tools according to claim 6, characterized in that: The ratchet (220) engages with the pawl (224) in one direction.

8. A method for machining ultra-deep holes with precision boring tools according to claim 4, characterized in that: There are four second support plates (208). Two second support plates (208) are located on the left side of the bottom of the second fixture table (204). Two second support plates (208) form a group. The two groups of second support plates (208) are symmetrically distributed from left to right. There are two screws (212), moving plates (209), third support plates (210), V-shaped fixed jaws (211), fifth support plates (216), first rotating rods (218) and gears (217). The two screws (212), moving plates (209), third support plates (210), V-shaped fixed jaws (211), fifth support plates (216), first rotating rods (218) and gears (217) are symmetrically distributed from left to right.

9. A method for machining ultra-deep holes using precision boring tools according to claim 6, characterized in that: The number of ratchet (220), fourth support plate (203), sixth support plate (215), second rotating rod (221), pawl (224), first connecting rod (225), tension spring (223), and second connecting rod (222) are all two, and the two ratchet (220), fourth support plate (203), sixth support plate (215), second rotating rod (221), pawl (224), first connecting rod (225), tension spring (223), and second connecting rod (222) are symmetrically distributed from left to right.

10. A high-precision hole machining method, using a tool obtained by the ultra-deep hole precision boring tool machining method according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: The boring tool (3) is precisely installed and adjusted. The center of the boring tool is completely aligned with the rotation center of the boring machine spindle through the tool adjustment device. Step 2: Determine that the tool extension length is greater than 8 and not greater than 8.

2. Step 3: Based on the size, location, and accuracy requirements of the holes, write a detailed machining program. For machining multiple holes, the machining sequence needs to be planned. Step 4: Use a suitable pecking-drilling machining method, that is, the boring bar (3) cuts in segments. After each cut to a certain depth, it is withdrawn from the hole to remove chips and cool down. Then continue cutting to effectively prevent chips from accumulating in the hole and ensure machining accuracy. Step 5: Using sensors installed on the machine tool, the temperature, vibration and other parameters of the machine tool are monitored in real time, and the CNC system compensates and adjusts the movement of the tool based on this data; Step six: After the hole is machined, high-precision measuring tools are used to inspect the size, shape and surface quality of the hole. If deviations are found to exceed the tolerance range, the cause will be analyzed and adjustments will be made in a timely manner to ensure that the holes of each part meet the high-precision requirements.

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