A keyway slotting device and method of use thereof

Abstract

A keyway slotting device, including a correction plate, a pressing plate, a locking bolt, the correction plate is an equilateral triangle structure, a slot is arranged at the center of one side, the slot is used for inserting cooperation with the boss arranged on the rectangular flange fixed at one end of the rudder shaft and coaxial with the rudder shaft, the pressing plate is arranged in the transverse slot arranged on the other side of the correction plate, one end of the locking bolt is screwed with the threaded hole arranged on the boss, in use, the correction plate is used to complete the graduation processing of three keyways on the rudder shaft, ensure the uniformity accuracy of the three keyways, then complete the taper matching of the rudder handle and the rudder shaft, ensure the taper contact area between the inner hole of the rudder handle and the outer circle of the rudder shaft, the axial distance of the rudder handle and the rudder shaft, then make a tool key, measure the gap value of the tool key and the keyway to match the keyway on the rudder handle and the keyway on the rudder shaft, finally determine the product key size, ensure the assembly accuracy of the final product key and the keyway.

Description

Technical Field

[0001] This invention belongs to the field of keyway processing technology, specifically relating to a keyway grooving device and its usage method. Background Technology

[0002] The rudder handle and rudder shaft are important components commonly used in servo motors, transmitting torque and power. The inner bore of the rudder handle and the outer circle of the rudder shaft are connected by three keys spaced 120° apart. The key and keyway assembly clearance must be less than 0.03. Manual machine tool processing can only guarantee the keyway machining and angle distribution of a single key. It is impossible to index the three keyways evenly distributed at 120°, thus failing to guarantee the required uniformity accuracy of the three keyways. Moreover, the outer circle of the rudder shaft and the inner bore of the rudder handle have both tapered and keyway fits. After the tapered assembly of the rudder handle and the rudder shaft, the relative position of the keyways will change slightly, requiring further refitting to meet the assembly accuracy requirements (key and keyway fit clearance less than 0.03). In addition, it is difficult to guarantee the contact area of ​​the tapered surfaces between the inner bore of the rudder handle and the outer circle of the rudder shaft, as well as the axial distance between the rudder handle and the rudder shaft after assembly. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the prior art by providing a keyway grooving device and its usage method that can guarantee the uniform distribution accuracy and assembly accuracy of the three keyways, ensure the conical contact area between the inner hole of the rudder handle and the outer circle of the rudder shaft, and ensure the axial distance between the rudder handle and the rudder shaft.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A keyway grooving device includes a correction plate, a pressure plate, and a locking bolt. The correction plate has an equilateral triangular structure with a slot at the center of one side. The slot is used to insert and cooperate with a boss fixed on a rectangular flange at one end of a rudder shaft and coaxially arranged with the rudder shaft. The pressure plate is located inside a transverse groove on the other side of the correction plate. One end of the locking bolt passes through the pressure plate and is threadedly connected to a threaded hole on the boss.

[0006] The pressure plate has a U-shaped structure and an opening. One end of the locking bolt passes through the opening and is threaded into the threaded hole.

[0007] The transverse groove is parallel to the first side of the correction plate, one end of the transverse groove is located on the second side of the correction plate, and the other end of the transverse groove is located on the third side of the correction plate.

[0008] The number of threaded holes and locking bolts is at least two.

[0009] A method of using a keyway grooving device, the method comprising:

[0010] Step 1: First, place the pressure plate inside the transverse groove and insert the boss into the slot. Then, pass the locking bolt through the pressure plate and threaded hole to pre-tighten it. After adjusting the first side of the correction plate to be parallel to the long side of the rectangular flange, tighten the locking bolt into the threaded hole.

[0011] Step 2: Adjust the machine tool spindle to be perpendicular to the first side of the correction plate. Machin the first keyway along the length of the rudder shaft on the outer conical surface at the other end of the rudder shaft. Then, control the rudder shaft to rotate 120° so that the machine tool spindle is perpendicular to the second side of the correction plate. Machin the second keyway along the length of the rudder shaft on the outer conical surface. Continue to control the rudder shaft to rotate 120° so that the machine tool spindle is perpendicular to the third side of the correction plate. Machin the third keyway along the length of the rudder shaft on the outer conical surface.

[0012] Step 3: First, use wire cutting to uniformly machine three keyways around the conical inner hole of the rudder. The keyways on the conical inner hole are opened along the length of the rudder. The included angle between adjacent keyways on the conical inner hole is 120°. During wire cutting, a trimming allowance is left on both sides of the keyway.

[0013] Step 4: Insert the outer conical surface into the conical inner hole and control the axial distance between the other end face of the rudder shaft and the end face of the rudder handle near the small diameter end of the conical inner hole to the set distance, and correct the contact area between the outer conical surface and the conical inner hole to the required range.

[0014] Step 5: Make a tooling key. The tooling key is a convex structure, including end A and end B. Insert end A and end B into the keyway on the rudder shaft and the keyway on the rudder stick, respectively. The gap between end A and the keyway on the rudder shaft meets the required range. The width of end B is smaller than the width of end A. The difference between the widths of end B and end A is greater than twice the trimming allowance.

[0015] Step 6: Measure the distance d1 between the inner wall of one side of the keyway on the rudder shaft and the inner wall of one side of the keyway on the rudder shaft handle, and the distance d2 between the inner wall of the other side of the keyway on the rudder shaft and the inner wall of the other side of the keyway on the rudder shaft handle. Scrape the two sides of the keyway on the rudder handle according to the distance values ​​d1 and d2 respectively.

[0016] Step 7: Produce the finished key, the width of which is the width of the A end of the tooling key or is at least 0.02mm lower than the width of the keyway on the rudder shaft.

[0017] The keyway machining in step one refers to: performing rough milling, finish milling, and milling the root fillet in sequence.

[0018] In step five, the required gap between end A and the keyway on the rudder shaft is no more than 0.03 mm.

[0019] The trimming allowance in step three is 0.2 mm.

[0020] In step four, adjusting the contact area between the outer conical surface and the conical inner hole to the required range means: first, applying blue oil to the outer conical surface, then inserting the outer conical surface into the conical inner hole, and scraping the high points with blue oil on the conical inner hole until the contact area reaches 70%.

[0021] The distance values ​​d1 and d2 are calculated according to the following formula:

[0022] d1 = d3 + d4 - d5;

[0023] d2 = d6 + d7 - d8;

[0024] In the above formula, d3 and d6 are the widths of the two sides of the tooling key step, respectively; d4 and d5 are the gap values ​​between the outer wall of end A and the inner wall of the keyway on the rudder shaft, respectively, measured by feeler gauge; d7 and d8 are the gap values ​​between the outer wall of end A and the inner wall of the keyway on the rudder shaft, respectively, measured by feeler gauge.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention discloses a keyway grooving device comprising a straightening plate, a pressure plate, and a locking bolt. The straightening plate has an equilateral triangular structure with a slot at the center of one side. The slot is for insertion and engagement with a boss fixed to one end of a rectangular flange and coaxially arranged with the rudder shaft. The pressure plate is located inside a transverse groove on the other side of the straightening plate. One end of the locking bolt passes through the pressure plate and is threaded into a threaded hole on the boss. In use, firstly, the straightening plate is installed on the rectangular flange of the rudder shaft, so that the first side of the straightening plate is parallel to the long side of the rectangular flange. Then, the machine tool spindle is adjusted to be perpendicular to the first side of the straightening plate to machine the first keyway. Subsequently, the rudder shaft is rotated 120° to make the machine tool spindle perpendicular to the second side of the straightening plate to machine the second keyway. The rudder shaft is rotated 120° again to make the machine tool spindle perpendicular to the second side of the straightening plate to machine the second keyway. The first step involves machining a third keyway perpendicular to the second side, completing the indexing of the three keyways on the rudder shaft and ensuring their indexing accuracy. The second step involves wire-cutting three keyways into the tapered inner hole of the rudder handle, then tapering the rudder handle to the rudder shaft. During assembly, the axial distance between the rudder handle and the rudder shaft is controlled within a set distance. Applying blue oil and scraping the high points ensures the contact area of ​​the tapered surfaces between the inner hole of the rudder handle and the outer circle of the rudder shaft. The third step involves fitting a tooling key, using it to measure the clearance between the keyway and the key on the rudder handle. Because there is a finishing allowance on the keyway of the rudder handle, the keyway can be fitted according to the clearance measurement results, ensuring the consistency between the keyway on the rudder handle and the keyway on the rudder shaft after fitting. This ensures that the final product's key and the keyway on the rudder handle, as well as the keyway on the rudder shaft, all meet the required assembly clearance range, guaranteeing the assembly accuracy of the keyways. Therefore, the present invention can guarantee the uniformity and assembly accuracy of the three keyways, the conical contact area between the inner hole of the rudder handle and the outer circle of the rudder shaft, and the axial distance between the rudder handle and the rudder shaft. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the keyway grooving device in this invention.

[0028] Figure 2 for Figure 1 A sectional view along the AA direction.

[0029] Figure 3 This is a schematic diagram of the assembly of the rudder shaft and rudder handle in this invention.

[0030] Figure 4 This is a schematic diagram of the assembly of the correction plate and the rudder shaft in this invention.

[0031] Figure 5 for Figure 3 BB-direction sectional view.

[0032] Figure 6 This is a schematic diagram of the keyway on the rudder in this invention.

[0033] Figure 7This is an assembly diagram of the keyway and tooling key on the rudder handle in this invention.

[0034] Figure 8 This is a schematic diagram of the tooling key in this invention.

[0035] Figure 9 This is a side view of the tooling key in this invention.

[0036] Figure 10 This is a schematic diagram of the machining of the first keyway on the outer conical surface of the rudder shaft.

[0037] Figure 11 This is a schematic diagram of the machining of the second keyway on the outer conical surface of the rudder shaft.

[0038] Figure 12 This is a schematic diagram of the machining of the third keyway on the outer conical surface of the rudder shaft.

[0039] In the figure, the components are: 1. Correction plate; 11. Slot; 12. Horizontal groove; 2. Pressure plate; 21. Opening; 3. Locking bolt; 4. Rudder shaft; 41. Rectangular flange; 411. Boss; 412. Threaded hole; 5. Machine tool spindle; 42. Outer conical surface; 6. Keyway; 7. Rudder handle; 71. Conical inner hole; 8. Tooling key; 81. End A; 82. End B. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0041] See Figures 1 to 12 A keyway grooving device is disclosed, comprising a correction plate 1, a pressure plate 2, and a locking bolt 3. The correction plate 1 is an equilateral triangular structure with a slot 11 at the center of one side. The slot 11 is used to insert and cooperate with a boss 411 fixed on a rectangular flange 41 at one end of a rudder shaft 4 and coaxially arranged with the rudder shaft 4. The pressure plate 2 is located inside a transverse groove 12 on the other side of the correction plate 1. One end of the locking bolt 3 passes through the pressure plate 2 and is threadedly connected to a threaded hole 412 on the boss 411.

[0042] The pressure plate 2 has a U-shaped structure and an opening 21. One end of the locking bolt 3 passes through the opening 21 and is threadedly connected to the threaded hole 412.

[0043] The transverse groove 12 is parallel to the first side of the correction plate 1, one end of the transverse groove 12 is located on the second side of the correction plate 1, and the other end of the transverse groove 12 is located on the third side of the correction plate 1.

[0044] The number of threaded holes 412 and locking bolts 3 is at least two.

[0045] A method of using a keyway grooving device, the method comprising:

[0046] Step 1: First, place the pressure plate 2 inside the transverse groove 12 and insert the boss 411 into the slot 11. Then, pass the locking bolt 3 through the pressure plate 2 and threaded hole 412 for pre-tightening. After adjusting the first side of the correction plate 1 to be parallel to the long side of the rectangular flange 41, lock the locking bolt 3 into the threaded hole 412.

[0047] Step 2: Adjust the machine tool spindle 5 to be perpendicular to the first side of the correction plate 1. Machin the first keyway 6 on the outer conical surface 42 at the other end of the rudder shaft 4 along the length of the rudder shaft 4. Then control the rudder shaft 4 to rotate 120° so that the machine tool spindle 5 is perpendicular to the second side of the correction plate 1. Machin the second keyway 6 on the outer conical surface 42 along the length of the rudder shaft 4. Continue to control the rudder shaft 4 to rotate 120° so that the machine tool spindle 5 is perpendicular to the third side of the correction plate 1. Machin the third keyway 6 on the outer conical surface 42 along the length of the rudder shaft 4.

[0048] Step 3: First, use wire cutting to uniformly machine three keyways 6 around the tapered inner hole 71 of the rudder 7. The keyways 6 on the tapered inner hole 71 are opened along the length of the rudder 7. The included angle between adjacent keyways 6 on the tapered inner hole 71 is 120°. During wire cutting, a trimming allowance is left on both sides of the keyway 6.

[0049] Step 4: Insert the outer conical surface 42 into the conical inner hole 71, and control the axial distance between the other end face of the rudder shaft 4 and the end face of the rudder handle 7 near the small diameter end of the conical inner hole 71 to the set distance, and correct the contact area between the outer conical surface 42 and the conical inner hole 71 to the required range.

[0050] Step 5: Install tooling key 8. Tooling key 8 is a convex structure, including end A 81 and end B 82. Insert end A 81 and end B 82 into the keyway 6 on the rudder shaft 4 and the keyway 6 on the rudder shank 7, respectively. The gap between end A 81 and the keyway 6 on the rudder shaft 4 meets the required range. The width of end B 82 is smaller than the width of end A 81. The difference in width between end B 82 and end A 81 is greater than twice the trimming allowance.

[0051] Step 6: Measure the distance d1 between the inner wall of one side of the keyway 6 on the rudder shaft 4 and the inner wall of one side of the keyway 6 on the rudder shaft 7, and the distance d2 between the inner wall of the other side of the keyway 6 on the rudder shaft 4 and the inner wall of the other side of the keyway 6 on the rudder shaft 7. Scrape the two sides of the keyway 6 on the rudder shaft 7 according to the distance values ​​d1 and d2 respectively.

[0052] Step 7: Produce the finished key. The width of the finished key is the width of end 81 of tooling key 8 or is at least 0.02 mm lower than the width of keyway 6 on rudder shaft 4.

[0053] The machining of keyway 6 in step one refers to: performing rough milling, finish milling, and milling root fillet in sequence.

[0054] In step five, the required gap between end A 81 and the keyway 6 on the rudder shaft 4 is no more than 0.03 mm.

[0055] The trimming allowance in step three is 0.2 mm.

[0056] In step four, adjusting the contact area between the outer conical surface 42 and the conical inner hole 71 to the required range means: first, applying blue oil to the outer conical surface 42, then inserting the outer conical surface 42 and the conical inner hole 71 into place, and scraping the high points with blue oil on the conical inner hole 71 until the contact area reaches 70%.

[0057] The distance values ​​d1 and d2 are calculated according to the following formula:

[0058] d1 = d3 + d4 - d5;

[0059] d2 = d6 + d7 - d8;

[0060] In the above formula, d3 and d6 are the widths of the two sides of the step of the tooling key 8, respectively; d4 and d5 are the gap values ​​between the outer wall of one side of end A 81 and the inner wall of one side of the keyway 6 on the rudder shaft 4, respectively, measured by feeler gauge; d7 and d8 are the gap values ​​between the outer wall of the other side of end A 81 and the inner wall of the other side of the keyway 6 on the rudder shaft 4, respectively, measured by feeler gauge.

[0061] The principle of this invention is explained as follows:

[0062] To address the difficulties in machining and assembling existing uniformly indexed keyways, this invention manufactures a tooling key 8 after the taper fit between the rudder shank 7 and the rudder shaft 4 is completed. The tooling key 8 is then used for trial assembly to measure the gap between the key and the keyway. Based on the measured gap, the keyway 6 on the rudder shank 7 and the keyway 6 on the rudder shaft 4 are fitted together to finally determine the product key size and ensure the final assembly accuracy requirements.

[0063] Example 1:

[0064] See Figures 1 to 12A keyway grooving device includes a correction plate 1, a pressure plate 2, and a locking bolt 3. The correction plate 1 has an equilateral triangular structure with a slot 11 at the center of one side. The slot 11 is used to insert and cooperate with a boss 411 fixed on a rectangular flange 41 at one end of a rudder shaft 4 and coaxially arranged with the rudder shaft 4. A transverse groove 12 is provided on the other side of the correction plate 1. The transverse groove 12 is parallel to the first side of the correction plate 1. One end of the transverse groove 12 is located on the second side of the correction plate 1, and the other end is located on the third side of the correction plate 1. The pressure plate 2 is located inside the transverse groove 12. The pressure plate 2 has a U-shaped structure and an opening 21. One end of the locking bolt 3 passes through the opening 21 and is threadedly connected to a threaded hole 412 on the boss 411. There are two threaded holes 412 and two locking bolts 3.

[0065] The above-mentioned keyway grooving device is used in accordance with the following steps:

[0066] 1. First, place the pressure plate 2 inside the transverse groove 12 and insert the boss 411 into the slot 11. Then, pass the locking bolt 3 through the pressure plate 2 and slightly pre-tighten the threaded hole 412. After adjusting the first side of the correction plate 1 to be parallel to the long side of the rectangular flange 41, lock the locking bolt 3 into the threaded hole 412. The threaded hole 412 can be machined out when milling the keyway of the rectangular flange 41.

[0067] 2. Adjust the machine tool spindle 5 to be perpendicular to the first side of the correction plate 1. Machin the first keyway 6 on the outer conical surface 42 at the other end of the rudder shaft 4 along the length of the rudder shaft 4. Then control the rudder shaft 4 to rotate 120° so that the machine tool spindle 5 is perpendicular to the second side of the correction plate 1. Machin the second keyway 6 on the outer conical surface 42 along the length of the rudder shaft 4. Continue to control the rudder shaft 4 to rotate 120° so that the machine tool spindle 5 is perpendicular to the third side of the correction plate 1. Machin the third keyway 6 on the outer conical surface 42 along the length of the rudder shaft 4. The machining of the keyway 6 refers to: performing rough milling, finish milling, and milling the root fillet in sequence.

[0068] 3. Machining a tapered inner hole 71 on the rudder 7 with a machining allowance, and then using wire cutting to uniformly machine three keyways 6 around the tapered inner hole 71 of the rudder 7. The keyways 6 on the tapered inner hole 71 are opened along the length of the rudder 7, and the included angle between adjacent keyways 6 on the tapered inner hole 71 is 120°. During wire cutting, a trimming allowance of 0.2mm is left on both sides of the keyway 6.

[0069] 4. Insert the outer conical surface 42 into the conical inner hole 71, and control the axial distance between the other end face of the rudder shaft 4 and the end face of the rudder handle 7 near the small diameter end of the conical inner hole 71 to a set distance L1. Correct the contact area between the outer conical surface 42 and the conical inner hole 71 to the required range. The correction of the contact area between the outer conical surface 42 and the conical inner hole 71 to the required range means: apply blue oil to the 1:10 taper of the outer conical surface 42, then insert the outer conical surface 42 into the conical inner hole 71, and scrape the high points with blue oil on the conical inner hole 71. Repeat the steps of applying blue oil and scraping the high points until the contact area reaches 70%.

[0070] 5. A tooling key 8 is made, which is a convex structure, including end A 81 and end B 82. End A 81 and end B 82 are respectively inserted into the keyway 6 on the rudder shaft 4 and the keyway 6 on the rudder shank 7. End A 81 is made to match the design dimensions of the keyway 6 (the design dimensions of the keyway 6 are width D, height H, and length L). The gap between the made end A 81 and the keyway 6 on the rudder shaft 4 does not exceed 0.03mm. The width of end B 82 is smaller than the width of end A 81, and the difference in width between end B 82 and end A 81 is greater than 0.4mm.

[0071] 6. Measure the distance d1 between one side of the inner wall of the keyway 6 on the rudder shaft 4 and the inner wall of one side of the keyway 6 on the rudder shaft 7, and the distance d2 between the other side of the inner wall of the keyway 6 on the rudder shaft 4 and the other side of the keyway 6 on the rudder shaft 7. Scrape both sides of the keyway 6 on the rudder shaft 7 according to the distances d1 and d2. The distances d1 and d2 are calculated using the following formula:

[0072] d1 = d3 + d4 - d5;

[0073] d2 = d6 + d7 - d8;

[0074] In the above formula, d3 and d6 are the widths of the two sides of the step of the tooling key 8, respectively; d4 and d5 are the gap values ​​between the outer wall of one side of end A 81 and the inner wall of one side of the keyway 6 on the rudder shaft 4, respectively, measured by feeler gauge; d7 and d8 are the gap values ​​between the outer wall of the other side of end A 81 and the inner wall of the other side of the keyway 6 on the rudder shaft 4, respectively, measured by feeler gauge.

[0075] 7. To make a finished key, the width of the finished key is the width of end 81 of tooling key 8 or is at least 0.02mm lower than the width of keyway 6 on rudder shaft 4, the height of the finished key is the designed height H of keyway 6, and the length is the designed length L of keyway 6;

[0076] 8. Install the two ends of the finished key into the keyway 6 on the rudder shaft 4 and the keyway 6 on the rudder handle 7. Use a feeler gauge to check the clearance, and ensure that the clearance is no greater than 0.03mm.

Claims

1. A method of using a keyway grooving device, characterized in that: The keyway grooving device includes a correction plate (1), a pressure plate (2), and a locking bolt (3). The correction plate (1) is an equilateral triangle structure with a slot (11) at the center of one side. The slot (11) is used to insert and cooperate with the boss (411) fixed on one end of the rectangular flange (41) and coaxially arranged with the rudder shaft (4). The pressure plate (2) is located inside the transverse groove (12) opened on the other side of the correction plate (1). One end of the locking bolt (3) passes through the pressure plate (2) and is threadedly connected to the threaded hole (412) opened on the boss (411). The pressure plate (2) has a U-shaped structure and an opening (21) is provided on the pressure plate (2). One end of the locking bolt (3) passes through the opening (21) and is threadedly connected to the threaded hole (412). The transverse groove (12) is parallel to the first side of the correction plate (1), one end of the transverse groove (12) is located on the second side of the correction plate (1), and the other end of the transverse groove (12) is located on the third side of the correction plate (1). The number of threaded holes (412) and locking bolts (3) is at least two; The method of use includes: Step 1: First, place the pressure plate (2) inside the transverse groove (12) and insert the boss (411) into the slot (11). Then, pass the locking bolt (3) through the pressure plate (2) and threaded hole (412) to pre-tighten. After adjusting the first side of the correction plate (1) to be parallel to the long side of the rectangular flange (41), lock the locking bolt (3) into the threaded hole (412). Step 2: Adjust the machine tool spindle (5) to be perpendicular to the first side of the correction plate (1), and machine the first keyway (6) on the outer conical surface (42) at the other end of the rudder shaft (4) along the length of the rudder shaft (4). Then control the rudder shaft (4) to rotate 120° so that the machine tool spindle (5) is perpendicular to the second side of the correction plate (1), and machine the second keyway (6) on the outer conical surface (42) along the length of the rudder shaft (4). Continue to control the rudder shaft (4) to rotate 120° so that the machine tool spindle (5) is perpendicular to the third side of the correction plate (1), and machine the third keyway (6) on the outer conical surface (42) along the length of the rudder shaft (4). Step 3: First, use wire cutting to uniformly process three keyways (6) around the conical inner hole (71) of the rudder (7). The keyways (6) on the conical inner hole (71) are opened along the length of the rudder (7). The included angle between adjacent keyways (6) on the conical inner hole (71) is 120°. During wire cutting, a trimming allowance is left on both sides of the keyway (6). Step 4: Insert the outer conical surface (42) into the conical inner hole (71) and control the axial distance between the other end face of the rudder shaft (4) and the end face of the rudder handle (7) near the small diameter end of the conical inner hole (71) to the set distance, and correct the contact area between the outer conical surface (42) and the conical inner hole (71) to the required range. Step 5: Make tooling key (8). The tooling key (8) is a convex structure, including end A (81) and end B (82). Insert end A (81) and end B (82) into the keyway (6) on the rudder shaft (4) and the keyway (6) on the rudder handle (7) respectively. The gap between end A (81) and the keyway (6) on the rudder shaft (4) meets the required range. The width of end B (82) is smaller than the width of end A (81). The difference in width between end B (82) and end A (81) is greater than twice the trimming allowance. Step 6: Measure the distance d1 between the inner wall of one side of the keyway (6) on the rudder shaft (4) and the inner wall of one side of the keyway (6) on the rudder shaft (7), and the distance d2 between the inner wall of the other side of the keyway (6) on the rudder shaft (4) and the inner wall of the other side of the keyway (6) on the rudder shaft (7). Scrape the two sides of the keyway (6) on the rudder shaft (7) according to the distance values ​​d1 and d2 respectively. Step 7: Make the finished key, the width of which is the width of the A end (81) of the tooling key (8) or is at least 0.02mm lower than the width of the keyway (6) on the rudder shaft (4).

2. The method of using the keyway grooving device according to claim 1, characterized in that: The machining of the keyway (6) in step two refers to: performing rough milling, fine milling, and milling the root fillet in sequence.

3. The method of using the keyway grooving device according to claim 1 or 2, characterized in that: In step five, the required gap between end A (81) and the keyway (6) on the rudder shaft (4) is not more than 0.03 mm.

4. The method of using the keyway grooving device according to claim 1 or 2, characterized in that: The trimming allowance in step three is 0.2 mm.

5. A method of using the keyway grooving device according to claim 1 or 2, characterized in that: In step four, the contact area between the outer conical surface (42) and the conical inner hole (71) is corrected to the required range. This means: first, apply blue oil to the outer conical surface (42), then insert the outer conical surface (42) and the conical inner hole (71) into the fit, and scrape the high points with blue oil on the conical inner hole (71) until the contact area reaches 70%.

6. A method of using the keyway grooving device according to claim 1 or 2, characterized in that: The distance values ​​d1 and d2 are calculated according to the following formula: d1 = d3 + d4 - d5; d2 = d6 + d7 - d8; In the above formula, d3 and d6 are the widths of the two sides of the tooling key (8) step measured by measurement; d4 and d5 are the gap values ​​between the outer wall of the A end (81) and the inner wall of the keyway (6) on the rudder shaft (4) measured by feeler gauge, and the gap values ​​between the outer wall of the B end (82) and the inner wall of the keyway (6) on the rudder shaft (4); d7 and d8 are the gap values ​​between the outer wall of the A end (81) and the inner wall of the keyway (6) on the rudder shaft (4) measured by feeler gauge, and the gap values ​​between the outer wall of the B end (82) and the inner wall of the keyway (6) on the rudder shaft (4).

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