Tool and method for machining dovetail faces of double dovetail keys

Abstract

The tool for machining the dovetail faces of the double dovetail keys comprises a clamp body and a pressing block, the upper surface of the clamp body is sequentially provided with a first horizontal positioning face, a second outwards-inclined positioning face and a third inwards-inclined positioning face, and a plurality of fastening screw holes are formed in the first positioning face; the second positioning surface is perpendicular to the third positioning surface, and a clearance groove is formed in the joint of the bottoms of the second positioning surface and the third positioning surface; the pressing block is integrally formed by a horizontally-arranged main plate and an inclined plate inclining outwards, a plurality of fastening long holes are formed in the main plate, a plurality of fastening screw holes are formed in the inclined plate, and fastening bolts and gaskets are installed between the fastening long holes and the fastening screw holes. The invention further discloses a machining method of the dovetail face of the double-dovetail key. The invention belongs to the technical field of mechanical equipment manufacturing, and solves the problems of poor machining precision and low machining efficiency of the dovetail surface of a double-dovetail key caused by unreasonable structure of a clamp in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment manufacturing technology, and relates to tooling for machining the dovetail surface of double dovetail keys. This invention also relates to a method for machining the dovetail surface of double dovetail keys. Background Technology

[0002] Double dovetail keys are key components in the assembly of a pyramidal drum, used to connect the jaw sector plates to the pyramidal spindle. Due to the large number of double dovetail keys and the very small clearance between the tail face of the double dovetail keys and the keyways in the relevant jaw sector plates and pyramidal spindle, high consistency is required. Therefore, the machining accuracy and quality of the double dovetail keys determine the subsequent assembly quality and the usage requirements of the pyramidal drum.

[0003] However, the existing double dovetail keys lack specialized clamping equipment during processing, resulting in inaccurate fixing methods and making the processing of the four dovetail surfaces on the double dovetail keys a difficult point in dovetail key manufacturing. Summary of the Invention

[0004] The purpose of this invention is to provide a tooling for machining the dovetail surface of double dovetail keys, which solves the problem that the existing fixture structure is unreasonable, resulting in poor machining accuracy and low machining efficiency of the double dovetail key dovetail surface.

[0005] Another objective of this invention is to provide a method for machining the dovetail surface of a double dovetail key, which solves the problem that the clamping method in the prior art is unreasonable and it is difficult to ensure high-efficiency and high-precision machining.

[0006] The technical solution adopted in this invention is a tooling for machining the dovetail surfaces of double dovetail keys, including a clamping body and a pressure block. The upper surface of the fixture is provided with a horizontal positioning surface 1, an outwardly inclined positioning surface 2, and an inwardly inclined positioning surface 3 in sequence. The positioning surface 1 has multiple engagement screw holes. The positioning surface 2 and the positioning surface 3 are set perpendicularly, and a hollow groove is provided at the bottom junction of the positioning surface 2 and the positioning surface 3. The pressure block is made of a horizontally set main plate and an outwardly inclined plate. The main plate has multiple engagement holes, and the inclined plate has multiple set screw holes. Engagement bolts and washers are installed between the engagement holes and the engagement screw holes.

[0007] Another technical solution adopted in this invention is a method for processing the dovetail surface of a double dovetail key, which utilizes the aforementioned tooling for processing the dovetail surface of a double dovetail key and is implemented according to the following steps: Preliminary steps: Fabricate the fixture body and pressure block; perform initial machining to obtain workpiece A; Step 1: Clamp and adjust workpiece A, complete the first machining of the dovetail surface, and obtain workpiece B; Step 2: Re-clamp and adjust workpiece B, complete the machining of dovetail surface two, and obtain workpiece C; Step 3: Re-clamp and adjust workpiece C, complete the third machining of the dovetail surface, and obtain workpiece D; Step 4: Re-clamp and adjust workpiece D, complete the machining of dovetail surface four, and obtain workpiece E; Step 5: According to the workpiece drawing requirements, machine the remaining shape of workpiece E on a planer to obtain the finished workpiece.

[0008] The beneficial effects of this invention are that the tooling is applicable to various milling machines, has a simple structure, is easy to assemble, and can significantly improve the machining accuracy and efficiency of the four dovetail surfaces on the double dovetail key during use. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the finished product outline of the workpiece processed by the method of the present invention; Figure 2 This is a schematic diagram of the structural parameters of the workpiece to be processed by the method of this invention; Figure 3 This is a schematic diagram of the overall structure of the tooling of the present invention; Figure 4 This is a schematic diagram of the pressure block in the tooling of the present invention; Figure 5 This is a schematic diagram of the clamping body in the tooling of the present invention; Figure 6 This is a diagram showing the positioning surface of the fixture in the tooling of this invention; Figure 7 This is a schematic diagram of the state of clamping and adjusting workpiece A according to the method of the present invention; Figure 8 This is a schematic diagram showing the state of workpiece B obtained by the method of this invention; Figure 9 This is a schematic diagram of the state of workpiece C obtained by the method of the present invention; Figure 10 This is a schematic diagram of the state of workpiece D obtained by the method of the present invention; Figure 11 This is a schematic diagram of the state of the workpiece E obtained by the method of the present invention.

[0010] In the diagram: 1. Clamp body, 2. Pressure block, 3. Set screw, 4. Engaging bolt, 5. Washer, 6. Workpiece; 101. Positioning surface one, 102. Positioning surface two, 103. Positioning surface three, 104. Empty tool groove, 105. Engaging bolt hole, 201. Inclined reference surface, 202. Positioning surface four, 203. Set screw hole, 204. Engaging elongated hole, 601. Dovetail surface one, 602. Dovetail surface two, 603. Dovetail surface three, 604. Dovetail surface four. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] Reference Figure 1 , Figure 2 The structure of workpiece 6, the finished product of the present invention, is described above. The drawing parameters of workpiece 6 include L, H, ∠A, b, c, r, geometric tolerances, and surface roughness. To ensure machining accuracy and quality, a hexagonal blank of (a)*b*L is pre-machined. This blank is referred to as workpiece A. Furthermore, all four sides of (a)*b are machined on a grinding machine; then, the tooling of this invention is used to complete the machining of the four dovetail surfaces on the double dovetail key, resulting in the finished workpiece 6.

[0013] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 The tooling of the present invention comprises a clamping body 1, a pressure block 2, a set screw 3, a clamping bolt 4, and a washer 5. The upper surface of the fixture body 1 is provided with a horizontal positioning surface 101, an outwardly inclined positioning surface 102, and an inwardly inclined positioning surface 103. Positioning surface 102 and positioning surface 103 are perpendicular to each other (90°). The parameter h is the distance between positioning surface 101 and the 90° angle line. The included angle ∠B between positioning surface 101 and positioning surface 103 is 180° - ∠A / 2. To ensure the accuracy and quality of the workpiece after machining, a tool groove 104 is provided at the bottom junction of positioning surface 102 and positioning surface 103. The roughness of the three positioning surfaces is not less than Ra3.2. Multiple engagement screw holes 105 are opened in positioning surface 101. The pressure block 2 is integrally made of a horizontally set main plate and an outwardly inclined plate at a large angle. The bottom surface of the main plate is called the positioning surface 202, and the outer surface of the inclined plate is called the inclined reference surface 201. There are multiple set screw holes 203 on the inclined plate, and the set screw holes 203 are perpendicular to the inclined reference surface 201. There are multiple engagement holes 204 on the main plate. The angle ∠B between the positioning surface 202 and the inclined reference surface 201 is 180°-∠A / 2. In order to ensure the accuracy and quality of the workpiece after processing, the surface roughness of the positioning surface 202 is not less than Ra3.2. The assembly method of the tooling of the present invention is as follows: the positioning surface 202 of the pressure block 2 is placed on the positioning surface 101 of the fixture body 1, so that the multiple engagement holes 204 on the pressure block 2 are aligned with the multiple engagement screw holes 105 on the fixture body 1, and multiple engagement bolts 4 and their washers 5 are used for initial connection; then, a set screw 3 is installed in each set screw hole 203 on the pressure block 2.

[0014] When using the tooling, place the workpiece 6 between the positioning surface 103 and the inclined reference surface 201. After adjusting the position, tighten all the clamping bolts 4 and their washers 5. Then tighten the set screws 3 to fix the workpiece 6, thereby fixing the pressure block 2, the workpiece 6 and the clamping body 1 into one unit.

[0015] Reference Figure 7 This is a schematic diagram showing the state of workpiece A being clamped in the fixture. Workpiece A has two vertical surfaces that are in contact with positioning surface 102 and positioning surface 103 respectively. After adjusting the position, the clamping block 2 is fixed with the clamping bolt 4. Then, each set screw 3 is tightened to secure workpiece A (the end of the set screw 3 is in contact with the workpiece, the inclined reference surface 201 does not directly contact the workpiece, and there is a small gap between the inclined reference surface 201 and the workpiece to facilitate the assembly and disassembly of the workpiece). At this time, the formula for calculating the theoretical vertical distance Y between the highest position of workpiece A and positioning surface 101 is: .

[0016] Reference Figure 8 This is a schematic diagram of obtaining workpiece B after machining workpiece A; first, the dovetail surface 601 is machined. During finishing, the formula for calculating the theoretical perpendicular distance Y1 between the dovetail surface 601 and the positioning surface 101 is: ; The vertical theoretical distance Y1 is the vertical tool travel amount at that location.

[0017] Reference Figure 9 This is a schematic diagram of machining workpiece B to obtain workpiece C. After workpiece B is flipped back and forth and re-clamped, the vertical surfaces on both sides of workpiece B are in close contact with positioning surface 102 and positioning surface 103 respectively. After adjusting the position, the clamping block 2 is fixed with the clamping bolt 4 and washer 5, and then the set screw 3 is tightened to fix workpiece B. Start machining dovetail surface 602. During finishing, the formula for calculating the vertical theoretical distance Y2 between the position of dovetail surface 602 and positioning surface 101 is: ; The vertical theoretical distance Y2 corresponds to the vertical tool travel at that location.

[0018] Reference Figure 10 This is a schematic diagram of obtaining workpiece D after machining workpiece C. Workpiece C is flipped over and re-clamped. The dovetail surface 602 and related thickness surfaces of workpiece C are aligned with positioning surfaces 101 and 103 respectively. After adjusting the position, the clamping block 2 is fixed with the clamping bolt 4 and washer 5, and then the set screw 3 is tightened to fix workpiece C. Machining of dovetail surface 603 begins. During finishing, the vertical distance between the position of dovetail surface 603 and positioning surface 101 is the workpiece dimension H. To avoid overmachining (ensuring allowance for subsequent machining), the width machining allowance needs to be measured after machining. The theoretical machining allowance is X1, calculated as follows: , The theoretical processing amount X1 is the width processing amount at this time.

[0019] Reference Figure 11 This is a schematic diagram of obtaining workpiece E after machining workpiece D. Workpiece D is flipped and re-clamped, with the dovetail surface 601 and related thickness surfaces of workpiece D in close contact with positioning surfaces 101 and 103. After adjusting the position, the clamping block 2 is fixed with the clamping bolt 4 and washer 5, and then the set screw 3 is tightened to fix workpiece D. Machining of dovetail surface 604 begins. During finishing, the vertical distance between the position of dovetail surface 604 and positioning surface 101 is the workpiece dimension H. To avoid overmachining (ensuring that there is allowance for subsequent steps r), the width machining allowance needs to be measured after machining. The theoretical machining allowance is calculated as X2. , The theoretical processing amount X2 is the width processing amount at this time.

[0020] The method for machining the dovetail surface of a double dovetail key according to the present invention utilizes the above-mentioned tooling for machining the dovetail surface of a double dovetail key, adopts the above-mentioned working principle, and completes the clamping of the entire tooling through the basic settings of a milling machine, and is implemented according to the following steps: Preparatory steps: 1) Make the jig body 1 and the pressing block 2; The fixture body 1 is provided with positioning surface 101, positioning surface 2 102, and positioning surface 3 103. Positioning surface 2 102 and positioning surface 3 103 are set perpendicularly. The parameter h is the vertical distance between positioning surface 101 and the 90° sharp angle line. The included angle ∠B between positioning surface 101 and positioning surface 3 103 is 180°-∠A / 2. In order to ensure the accuracy and quality of the workpiece after processing, a tool groove 104 is provided at the bottom junction of positioning surface 2 102 and positioning surface 3 103. The surface roughness of the three positioning surfaces is not less than Ra3.2. The pressure block 2 is provided with a positioning surface 202 and an inclined reference surface 201. The angle ∠B formed by the positioning surface 202 and the inclined reference surface 201 is 180°-∠A / 2. In order to ensure the accuracy and quality of the workpiece after processing, the roughness of the positioning surface 202 is not less than Ra3.2.

[0021] 2) Initial processing yields workpiece A, whose state is (a)*b*L hexagonal, where the parameters are... Furthermore, all four sides of (a) and (b) are machined by grinding, with the relevant surfaces perpendicular to each other and a roughness of not less than Ra3.2.

[0022] Step 1: Clamp and adjust workpiece A, complete the dovetail surface 601 machining, and obtain workpiece B; See Figure 7Fix the fixture body 1 on the milling machine worktable. Test-fit the pressure block 2 with the fixture body 1, ensuring that the positioning surface 103 is parallel to the inclined reference surface 201, and that the distance between the positioning surface 103 and the inclined reference surface 201 is slightly greater than the workpiece width b. Place workpiece A, ensuring that two vertical surfaces of the workpiece are in contact with the positioning surface 102 and the positioning surface 103. Use the clamping bolt 4 to fix the pressure block 2 through the clamping screw hole 105 and the clamping elongated hole 204. Then, use the set screw 3 to fix workpiece A through the set screw hole 203. At this point, the formula for calculating the theoretical vertical distance Y between the highest position of workpiece A and the positioning surface 101 is: , in, ; When machining the dovetail surface 601, during finishing, the theoretical vertical distance between the position of the dovetail surface 601 and the positioning surface 101 is the vertical feed amount Y1. ; After processing, workpiece B is obtained, see Figure 8 .

[0023] Step 2: Re-clamp and adjust workpiece B, complete the machining of dovetail surface 2 602, and obtain workpiece C; Loosen the set screw 3, remove the workpiece B, and re-clamp it by flipping it back and forth to ensure that the other two vertical surfaces of the workpiece B are in close contact with the second positioning surface 102 and the third positioning surface 103. After adjusting the position, use the set screw 3 to fix the workpiece B through the set screw hole 203. When machining dovetail surface 2 602, during finishing, the theoretical vertical distance between the position of dovetail surface 2 602 and the positioning surface 1 101 is the vertical feed amount Y2. The formula for calculating the theoretical vertical distance Y2 is: , After processing, workpiece C is obtained, see Figure 9 ; Step 3: Re-clamp and adjust workpiece C, complete the dovetail surface 3603 machining, and obtain workpiece D; Loosen the set screw 3, remove the workpiece C, and re-clamp it by flipping it up and down to ensure that the dovetail surface 602 and related thickness surfaces of the workpiece C are in close contact with the positioning surface 101 and the positioning surface 3 103. After adjusting the position, use the set screw 3 to fix the workpiece C through the set screw hole 203. When machining dovetail surface 3603, during finishing, the vertical distance between dovetail surface 3603 and positioning surface 101 is the vertical feed amount Y3=H. To avoid overmapping and ensure allowance for subsequent machining, the width machining allowance needs to be measured after machining. The theoretical machining allowance is X1, calculated as follows: , After processing, workpiece D is obtained, see... Figure 10 ; Step 4: Re-clamp and adjust workpiece D, complete the machining of the dovetail surface 604, and obtain workpiece E; Loosen the set screw 3, remove the workpiece D, and re-clamp it by flipping it back and forth to ensure that the dovetail surface 601 and related thickness surfaces of the workpiece D are in close contact with the positioning surface 101 and the positioning surface 103. After adjusting the position, use the set screw 3 to fix the workpiece D through the set screw hole 203. When machining the dovetail surface 4 (604), during finishing, the vertical distance between the position of the dovetail surface 4 (604) and the positioning surface 101 is the vertical feed amount Y4 = H. To avoid overmapping and ensure that there is allowance in subsequent machining, the width machining allowance needs to be measured after machining. The theoretical machining allowance is X2. The formula for calculating the theoretical machining allowance X2 is: , After processing, workpiece E is obtained, see Figure 11 ; Step 5: Use a self-grinding forming tool, clamp and adjust workpiece E multiple times, and machine the remaining shape of workpiece E on a planer according to the drawing requirements of workpiece 6 to finally obtain the finished workpiece 6.

[0024] Example 1 In this embodiment 1, the double dovetail key dovetail surface is processed according to the aforementioned processing method, and the double dovetail key finished product is completed by using the aforementioned tooling for processing the double dovetail key dovetail surface.

[0025] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=30f7, ∠A=135°, b=29-0.05, c=16.5-0.05, r=2.5, h=2.5. The calculations yielded: (a) = 39.306, ∠B = 180° - ∠A / 2 = 112.5°.

[0026] The workpiece to be processed is in the state of (a)*b*L=39.306*(29-0.05)*200 and 39.306*(29-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0027] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1=40.129, the dovetail surface 601 is machined.

[0028] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=38.598, the dovetail surface 2602 is machined.

[0029] Step 3, refer to Figure 10 Clamp, press Figure 10With a vertical feed rate Y3=H=30, the dovetail surface 3603 is machined, and the width machining amount X1=16.824.

[0030] Step 4, refer to Figure 11 Clamp, press Figure 11 With a vertical feed rate Y4=H=30, the dovetail surface 604 is machined, and the width machining amount X2=12.494.

[0031] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0032] The dimensional accuracy and geometric tolerances of the double dovetail key processed in Example 1 meet the requirements of the drawings.

[0033] Example 2 In this embodiment 2, the double dovetail key dovetail surface is processed according to the aforementioned processing method, and the double dovetail key finished product is completed by using the aforementioned tooling for processing the double dovetail key dovetail surface.

[0034] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=25f7, ∠A=125°, b=25-0.05, c=13.5-0.05, r=2.5, h=2.5, The calculations yielded: (a) = 35.212, ∠B = 180° - ∠A / 2 = 117.5°.

[0035] The workpiece to be processed is in the state of (a)*b*L=35.212*(25-0.05)*200 and 35.212*(25-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0036] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1 = 34.967, the dovetail surface 601 was machined.

[0037] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=34.044, the dovetail surface 2602 is machined.

[0038] Step 3, refer to Figure 10 Clamp, press Figure 10 With a vertical feed rate Y3=H=25, the dovetail surface 3603 is machined, and the width machining amount X1=13.918.

[0039] Step 4, refer to Figure 11 Clamp, press Figure 11With a vertical feed rate Y4=H=25, the dovetail surface 604 is machined, and the width machining amount X2=11.663 is completed.

[0040] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0041] The dimensional accuracy and geometric tolerances of the double dovetail keys processed in this embodiment 2 meet the requirements of the drawings.

[0042] Example 3 In this embodiment 3, the double dovetail key is processed using the aforementioned double dovetail key dovetail surface processing method and the aforementioned tooling for processing double dovetail key dovetail surfaces.

[0043] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=25f7, ∠A=125°, b=25-0.05, c=12.5-0.05, r=2.5, h=2.5, The calculations yielded: (a) = 34.691, ∠B = 180° - ∠A / 2 = 117.5°.

[0044] The workpiece to be processed is in the state of (a)*b*L=34.691*(25-0.05)*200 and 34.691*(25-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0045] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1=34.044, the dovetail surface 601 is machined.

[0046] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=34.044, the dovetail surface 2602 is machined.

[0047] Step 3, refer to Figure 10 Clamp, press Figure 10 With a vertical feed rate Y3=H=25, the dovetail surface 3603 is machined, and the width machining amount X1=12.791.

[0048] Step 4, refer to Figure 11 Clamp, press Figure 11 With a vertical feed rate Y4=H=25, the dovetail surface 604 is machined, and the width machining amount X2=12.791 is completed.

[0049] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0050] The dimensional accuracy and geometric tolerances of the double dovetail keys processed in this embodiment 3 meet the requirements of the drawings.

[0051] Example 4 In this embodiment 4, the double dovetail key dovetail surface is processed according to the aforementioned processing method, and the double dovetail key finished product is completed by using the aforementioned tooling for processing the double dovetail key dovetail surface.

[0052] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=25f7, ∠A=135°, b=26-0.05, c=13.5-0.05, r=2.5, h=2.5, The calculations yielded: (a) = 32.652, ∠B = 180° - ∠A / 2 = 112.5°.

[0053] The workpiece to be processed is in the state of (a)*b*L= 32.652*(25-0.05)*200 and 32.652*(25-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0054] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1 = 32.832, the dovetail surface 601 was machined.

[0055] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=32.45, the dovetail surface 2602 is machined.

[0056] Step 3, refer to Figure 10 Clamp, press Figure 10 With a vertical feed rate Y3=H=25, the dovetail surface 603 is machined, and the width machining amount X1=13.577.

[0057] Step 4, refer to Figure 11 Clamp, press Figure 11 With a vertical feed rate Y4=H=25, the dovetail surface 604 is machined, and the width machining amount X2=12.494 is completed.

[0058] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0059] The dimensional accuracy and geometric tolerances of the double dovetail key processed in Example 4 meet the requirements of the drawings.

[0060] Example 5 In this embodiment 5, the double dovetail key is processed using the aforementioned double dovetail key dovetail surface processing method and the aforementioned tooling for processing double dovetail key dovetail surfaces.

[0061] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=30f7, ∠A=140°, b=28-0.05, c=14-0.05, r=2.5, h=2.5, The calculations yielded: (a) = 37.021, ∠B = 180° - ∠A / 2 = 110°.

[0062] The workpiece to be processed is in the state of (a)*b*L= 37.021*(28-0.05)*200 and 37.021*(28-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0063] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1=37.077, the dovetail surface 601 is machined.

[0064] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=37.077, the dovetail surface 2602 is machined.

[0065] Step 3, refer to Figure 10 Clamp, press Figure 10 With a vertical feed rate Y3=H=30, the dovetail surface 603 is machined, and the width machining amount X1=13.989 is completed.

[0066] Step 4, refer to Figure 11 Clamp, press Figure 11 With a vertical feed rate Y4=H=30, the dovetail surface 604 is machined, and the width machining amount X2=13.989 is completed.

[0067] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0068] The dimensional accuracy and geometric tolerances of the double dovetail key processed in Example 5 meet the requirements of the drawings.

[0069] Example 6 In this embodiment 6, the double dovetail key is processed using the aforementioned double dovetail key dovetail surface processing method and the aforementioned tooling for processing double dovetail key dovetail surfaces.

[0070] The parameters of workpiece 6 and fixture body 1 are as follows (all dimensions are in mm): L=200, H=35f7, ∠A=140°, b=30-0.05, c=16.5-0.05, r=2.5, h=2.5, The calculation yields: (a) = 43.252, ∠B = 180° - ∠A / 2 = 110°.

[0071] The workpiece to be processed is in the state of (a)*b*L= 43.252*(30-0.05)*200 and 43.252*(30-0.05) is processed on all four sides by a grinding machine. The relevant surfaces are perpendicular to each other and the roughness is not less than Ra3.2.

[0072] Step 1, refer to Figure 7 Clamp, press Figure 8 With a vertical feed rate Y1 = 43.787, the dovetail surface 601 was machined.

[0073] Step 2, refer to Figure 9 Clamp, press Figure 9 With a vertical feed rate Y2=42.761, the dovetail surface 2602 is machined.

[0074] Step 3, refer to Figure 10 Clamp, press Figure 10 With a vertical feed rate Y3=H=35, the dovetail surface 3603 is machined, and the width machining amount X1=16.649.

[0075] Step 4, refer to Figure 11 Clamp, press Figure 11 With a vertical feed rate Y4=H=35, the dovetail surface 604 is machined, and the width machining amount X2=13.456 is completed.

[0076] Step 5: Grind the self-forming tool, clamp and adjust the workpiece multiple times, and machine the remaining shape r=2.5 on a planer to obtain the finished workpiece 6.

[0077] The dimensional accuracy and geometric tolerances of the double dovetail key machined in Example 6 meet the requirements of the drawings.

Claims

1. A tooling for machining the dovetail surfaces of double dovetail keys, characterized in that: It includes a clamping body (1) and a pressing block (2). The upper surface of the fixture body (1) is provided with a horizontal positioning surface one (101), an outwardly inclined positioning surface two (102), and an inwardly inclined positioning surface three (103). The positioning surface one (101) has multiple engagement screw holes (105). The positioning surface two (102) and the positioning surface three (103) are set perpendicularly. A hollow knife groove (104) is provided at the bottom junction of the positioning surface two (102) and the positioning surface three (103). The pressure block (2) is made of a horizontally set main plate and an outwardly inclined plate. The main plate has multiple engagement holes (204), and the inclined plate has multiple set screw holes (203). Engagement bolts (4) and washers (5) are installed between the engagement holes (204) and engagement screw holes (105).

2. The tooling for machining the dovetail surface of a double dovetail key according to claim 1, characterized in that, The bottom surface of the main board is called positioning surface four (202), and the outer surface of the inclined plate is called inclined reference surface (201).

3. The tooling for machining the dovetail surfaces of double dovetail keys according to claim 2, characterized in that, The angle between the fourth positioning surface (202) and the inclined reference surface (201) is equal to the angle between the first positioning surface (101) and the third positioning surface (103); the set screw hole (203) is perpendicular to the inclined reference surface (201).

4. A method for machining the dovetail surface of a double dovetail key, using the tooling for machining the dovetail surface of a double dovetail key as described in any one of claims 1-3, characterized in that, Follow these steps: Preliminary steps: Make the fixture body (1) and pressure block (2); perform preliminary machining to obtain workpiece A; Step 1: Clamp and adjust workpiece A, complete the dovetail surface (601) machining, and obtain workpiece B; Step 2: Re-clamp and adjust workpiece B, complete the machining of dovetail surface 2 (602), and obtain workpiece C; Step 3: Re-clamp and adjust workpiece C, complete the dovetail surface three (603) machining, and obtain workpiece D; Step 4: Re-clamp and adjust workpiece D, complete the machining of dovetail surface four (604), and obtain workpiece E; Step 5: According to the drawing requirements of workpiece (6), process the remaining shape of workpiece E on a planer to obtain the finished workpiece (6).

5. The processing method for the dovetail surface of the double dovetail key according to claim 4, characterized in that, The specific process in the preparatory steps is as follows: 1) Making the jig body (1) and the pressing block (2): The clamping body (1) is provided with positioning surface one (101), positioning surface two (102) and positioning surface three (103). Positioning surface two (102) and positioning surface three (103) are set perpendicularly. The angle ∠B formed by positioning surface one (101) and positioning surface three (103) is 180°-∠A / 2. A hollow knife groove (104) is provided at the bottom junction of positioning surface two (102) and positioning surface three (103). The pressure block (2) is provided with positioning surface four (202) and inclined reference surface (201). The angle ∠B formed by positioning surface four (202) and inclined reference surface (201) is 180°-∠A / 2. 2) The initial processing yields workpiece A, which is hexagonal in shape, with four of the sides being machined by a grinding machine and the relevant surfaces being perpendicular to each other.

6. The processing method for the dovetail surface of the double dovetail key according to claim 4, characterized in that, In step 1, the specific process is as follows: Fix the fixture body (1) on the milling machine worktable. Test-fit the pressure block (2) and the fixture body (1) to ensure that the positioning surface three (103) is parallel to the inclined reference surface (201) and that the distance between the positioning surface three (103) and the inclined reference surface (201) is slightly greater than the workpiece width b. Place the workpiece A and ensure that the workpiece has two vertical surfaces that are in contact with the positioning surface two (102) and the positioning surface three (103). Use the clamping bolt (4) to fix the pressure block (2) through the clamping screw hole (105) and the clamping elongated hole (204). Then use the set screw (3) to fix the workpiece A through the set screw hole (203). Start machining dovetail surface 601. During finishing, the vertical theoretical distance between the position of dovetail surface 601 and the positioning surface (101) is the vertical feed amount. After machining, workpiece B is obtained.

7. The processing method for the dovetail surface of the double dovetail key according to claim 4, characterized in that, Step 2, the specific process is as follows: Loosen the set screw (3), take out the workpiece B, flip it back and forth and clamp it again to ensure that the other two vertical surfaces of the workpiece B are in close contact with the second positioning surface (102) and the third positioning surface (103). After adjusting the position, use the set screw (3) to fix the workpiece B through the set screw hole (203). Start machining dovetail surface two (602). During finishing, the vertical theoretical distance between the position of dovetail surface two (602) and the positioning surface one (101) is the vertical feed amount. After machining, workpiece C is obtained.

8. The processing method for the dovetail surface of the double dovetail key according to claim 4, characterized in that, Step 3, the specific process is as follows: Loosen the set screw (3), take out the workpiece C, flip it up and down again to ensure that the dovetail surface two (602) and related thickness surface of the workpiece C are in close contact with the positioning surface one (101) and positioning surface three (103). After adjusting the position, use the set screw (3) to fix the workpiece C through the set screw hole (203). Start machining dovetail surface three (603). During finishing, the vertical distance between the position of dovetail surface three (603) and the positioning surface one (101) is the vertical feed amount Y3=H. In order to avoid over-machining and ensure that there is a margin in the subsequent r, the width machining amount needs to be measured after machining. After machining, the workpiece D is obtained.

9. The processing method for the dovetail surface of a double dovetail key according to claim 4, characterized in that, Step 4, the specific process is as follows: Loosen the set screw (3), take out the workpiece D, flip it back and forth and clamp it again to ensure that the dovetail surface 601 and related thickness surface of the workpiece D are in close contact with the positioning surface 1 (101) and the positioning surface 3 (103). After adjusting the position, use the set screw (3) to fix the workpiece D through the set screw hole (203). Start machining dovetail surface four (604). During finishing, the vertical distance between the position of dovetail surface four (604) and the positioning surface one (101) is the vertical tool feed. In order to avoid over-machining and ensure that there is a margin in the subsequent r, the width machining amount needs to be measured after machining. After machining, the workpiece E is obtained.

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