A processing method for machining inclined holes on the surface of a part

Abstract

The present invention relates to a method for machining an inclined hole on a surface of a part, which comprises the following steps in sequence: S1, using a drill bit with a drill point angle θ of 120°; S2, fixing the part, with the drill bit axis perpendicular to the machining surface, with the drill tip contacting the machining surface and located on a straight line between the first edge point of the hole and the center point of the hole, and with the drill tip offset from the center point of the hole by D / 2; the drill bit axially drills 3D1 / 6, 0.816D≤D1≤D, and axially withdraws the tool to obtain a pre-drilled hole; S2, deflecting the drill bit 30° toward the side where the first edge point of the hole is located, and moving The drill bit is moved so that the drill tip contacts the wall of the pre-drilled hole, and the distance between the contact point P0 and the center axis of the inclined hole is 0.079D~0.183D. The drill bit feeds axially for drilling, and the drill tip reaches position point P1, and the distance L1 between it and the center axis of the inclined hole is 0.211D; S3~S8 are performed in 5 times, and each time the drill bit feeds axially and deflects 5°. The movement path of the drill tip is arc-shaped, and the drill tip moves a specific distance along the radial and axial direction of the inclined hole; S9, the drill bit drills axially along the axis of the inclined hole to a specified depth to obtain an inclined hole.

Description

Technical Field

[0001] The present invention relates to the field of part hole processing, and in particular to a processing method for processing an inclined hole on a part surface. Background Art

[0002] High-temperature alloy standard parts are widely used in engine components, and their cutting performance is poor. The existing drilling process on such parts usually fixes the parts and feeds the drill in the axial direction (pecking drilling, buried drilling, double-end drilling, etc.). The drilling process is easily affected by the part material, drill point angle and unevenness of the machined surface.

[0003] In engine parts, it is necessary to machine a fuse hole on a certain surface of the hexagonal part that is inclined to the surface plane. Figure 1 and attached Figure 2 As shown, the angle between the hole and the surface is 30°. The existing fuse hole processing adopts the following methods: (1) Method 1 is to fix the part, and use the guide sleeve of the fixture (drilling jig) to guide the drill bit to feed along the axis of the hole directly to process the part and drill directly through. However, because the surface of the part is not perpendicular to the axis of the hole, the drill bit is subjected to eccentric force when contacting the surface of the part, which can easily lead to drill bit breakage and drill bit center offset (the entrance is usually not obvious under the constraint of the guide sleeve, while the exit offset will be multiplied according to the depth of the hole). The hole size will be larger due to the influence of the eccentric force on the drill bit. (2) Method 2 is to use the guide sleeve of the fixture (drilling jig) to guide the drill bit to process the part, first only process half the hole depth, not drill through, and then turn over to process the other side. This method only improves the problem of the exit size offset in the above method 1, which will cause the hole processing mark, and the other problems are not improved. (3) Method 3 is to use the guide sleeve of the fixture (drilling jig) to first guide the drill to flatten the bevel, and then use the drill bit to process the part. This method can reduce the problems caused by the above method 1 to a certain extent (it cannot be completely avoided), but it increases tooling and process steps, and reduces efficiency. Summary of the Invention

[0004] In view of the shortcomings of the existing technology mentioned above, the technical problem to be solved by the present invention is to provide a processing method for processing inclined holes on the surface of a part. The drill bit is subjected to force training during drilling to avoid the deviation of the drill center and the bell-mouth phenomenon. The processing efficiency is high and the cost is low.

[0005] To achieve the above-mentioned object, the present invention provides a processing method for processing an inclined hole on a part surface, wherein the angle between the central axis of the inclined hole and the processing surface of the part on which it is located is 30°, the diameter of the inclined hole is D, the intersection point of the central axis of the inclined hole and the processing surface is the center point of the hole opening, the hole opening of the inclined hole on the processing surface is elliptical, and the two edge points on the major axis are respectively a first edge point of the hole opening and a second edge point of the hole opening, the angle between the line connecting the second edge point of the hole opening and the center point of the hole opening and the central axis of the inclined hole is 30°, and the edge lines of the side wall of the inclined hole extending along the axis at the first edge point of the hole opening and the second edge point of the hole opening are respectively a first edge line and a second edge line, and the processing method comprises the following steps in sequence:

[0006] S1, using a drill bit with a drill point angle θ of 120° and a drill diameter of D;

[0007] S2. The part is fixed, the drill axis is perpendicular to the machining surface, the drill tip contacts the machining surface and is located on the straight line between the first edge point of the hole and the center point of the hole, and the offset distance between the drill tip and the center point of the hole is D / 2; the drill is fed axially to a drilling depth of 0.816D≤D1≤D; then the drill is retracted axially to obtain a pre-drilled hole on the machining surface;

[0008] S2. The drill bit is deflected 30° toward the side where the first edge point of the hole is located. The included angle between the drill bit axis and the machining surface is 30°. The drill bit is moved so that the drill tip contacts the wall of the pre-drilled hole, and the distance L0 between the contact point P0 and the center axis of the inclined hole is 0.079D to 0.183D. The drill bit is axially fed to a certain depth until the drill tip reaches position P1. The distance between position P1 and the center axis of the inclined hole is L1 = 0.211D.

[0009] S3: The drill bit feeds axially and gradually deflects 5° toward the side of the first edge point of the hole, so that the movement path of the drill tip is arc-shaped. The drill tip moves 0.042D toward the center axis of the inclined hole in the radial direction and 0.094D in the axial direction of the inclined hole.

[0010] S4, the drill bit feeds axially and gradually deflects 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.040D toward the center axis of the inclined hole in the radial direction of the inclined hole and 0.107D in the axial direction of the inclined hole.

[0011] S5: The drill bit feeds axially and gradually deflects 5° toward the side of the first edge point of the hole. The movement path of the drill tip is arc-shaped. The drill tip moves 0.037D toward the center axis of the inclined hole in the radial direction and 0.126D in the axial direction of the inclined hole.

[0012] S6: The drill bit feeds axially and deflects 5° toward the first edge of the hole. The drill tip moves in an arc-shaped path. The drill tip moves 0.035D toward the center axis of the inclined hole in the radial direction and 0.148D in the axial direction of the inclined hole.

[0013] S7, the drill bit feeds axially and gradually deflects 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.030D along the radial direction of the inclined hole toward the center axis of the inclined hole and 0.202D in the axial direction of the inclined hole.

[0014] S8, the drill bit feeds axially, and at the same time, the drill bit gradually deflects 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.027D along the radial direction of the inclined hole toward the center axis of the inclined hole, and moves 0.478D in the axial direction of the inclined hole.

[0015] S9. The drill bit is axially along the axis of the inclined hole and drills to a specified depth to obtain an inclined hole.

[0016] Furthermore, in step S2, D1=D.

[0017] Furthermore, in steps S3 to S8, the drill bit feeds axially at a uniform speed and deflects at a uniform speed.

[0018] Furthermore, in step S3, the motion trajectory of the drill bit is tangent to the side of the pre-drilled hole in step S2 that is closest to the first edge line.

[0019] Furthermore, in steps S4 to S8, the motion trajectory of the drill bit is tangent to the motion trajectory of the drill bit in the previous step.

[0020] Furthermore, the part is a regular hexagon, and the machining surface plane is one of the six sides of the regular hexagon, the inclined hole is a through hole, and in step S8, the drill bit drills through it.

[0021] Furthermore, in step S2, after the part is fixed, the angle between the machining surface plane and the horizontal plane is 60°, and the central axis of the inclined hole is vertical.

[0022] As described above, the processing method of the present invention has the following beneficial effects:

[0023] A new drilling method is provided. In the short, initial drilling period, a small hole is first drilled using steps S2 and S3. The drill bit remains perpendicular to the contacted surface, ensuring uniform force. This avoids deviation of the drill center due to uneven force at the contact point, and also prevents the bell-mouth phenomenon caused by uneven force at the contact point. Then, using steps S4 to S8, the drill bit feeds axially while deflecting, continuously drilling a short distance. When the drill bit edge is at the second edge of the hole, the drill bit axially follows the axial direction of the inclined hole, and normal drilling is then performed. This method achieves high processing efficiency and low cost, maximizing the cutting performance of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The invention relates to an existing method for machining inclined holes on the machining surface plane of a part.

[0025] Figure 2 This is a schematic diagram of the structure of the inclined hole on the machining surface of the part.

[0026] Figure 3 This is a schematic diagram of the processing in step S2 of the processing method of the present invention.

[0027] Figure 4 for Figure 3 Enlarged view of circle A in .

[0028] Figure 5 This is a schematic diagram of the processing in step S3 of the processing method of the present invention.

[0029] Figure 6 for Figure 5 Enlarged view of circle B in .

[0030] Figure 7 Schematic diagram of drill bit deflection during steps S4 to S8 in the machining method of the present invention.

[0031] Figure 8 Schematic diagram of the positions P1 to P7 of the drill tip in steps S4 to S8 of the machining method of the present invention.

[0032] Explanation of Figure Numbers

[0033] 1 part

[0034] 11 Machining surface

[0035] 2 inclined holes

[0036] 21 Orifice center point

[0037] 22 First side point of orifice

[0038] 23 Second side point of orifice

[0039] 24 First Margin Line

[0040] 25 Second margin line

[0041] 3 drill bits

[0042] 4. Fixture

[0043] 5 Pre-drilling DETAILED DESCRIPTION

[0044] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0048] like Figures 2 to 8As shown, the present invention provides a processing method for processing an inclined hole on a part surface, the angle between the central axis of the inclined hole 2 and the processing surface 11 of the part 1 on which it is located is 30 degrees, and the diameter of the inclined hole 2 is D. For the convenience of explanation, in the present invention, the intersection point of the central axis of the inclined hole 2 and the processing surface 11 is the center point 21 of the hole opening, the hole opening of the inclined hole 2 on the processing surface 11 is an elliptical shape, and the two edge points of the hole opening on the major axis of the ellipse are respectively the first edge point 22 of the hole opening and the second edge point 23 of the hole opening, the angle between the line connecting the second edge point 23 of the hole opening and the center point 21 of the hole opening and the central axis of the inclined hole 2 is 30 degrees, and the edge lines of the side wall of the inclined hole 2 at the first edge point 22 of the hole opening and the second edge point 23 of the hole opening along the axis are respectively the first edge line 24 and the second edge line 25, see Figure 2 As shown, Figure 2 This is a schematic cross-sectional view of the inclined hole 2 through the major axis of the elliptical aperture. Both the first edge line 24 and the second edge line 25 are parallel to the central axis of the inclined hole 2 and are each spaced a distance D / 2 from the central axis of the inclined hole 2. In this embodiment, for ease of illustration, the first edge line 24 and the second edge line 25 are located to the left and right of the central axis of the inclined hole 2, respectively.

[0049] The processing method of the present invention comprises the following steps in sequence:

[0050] S1. Use a drill bit 3 with a drill point angle θ of 120° for processing. The diameter of the drill bit 3 is D.

[0051] S2, part 1 is fixed, the axis of the drill bit 3 is perpendicular to the machining surface 11, the drill tip of the drill bit 3 contacts the machining surface 11 and is located on the straight line between the first edge point 22 of the hole and the center point 21 of the hole, and the offset distance between the drill tip and the center point 21 of the hole is D / 2, see Figure 3 and Figure 4 As shown, the drill tip is located at the midpoint of the straight line between the first edge point 22 of the hole and the center point 21 of the hole. The drill bit 3 is fed axially and the drilling depth is Where 0.816D≤D1≤D; then the drill bit 3 is axially withdrawn to obtain a pre-drilled hole 5 on the machining surface 11. Specifically, the part 1 can be fixed by a suitable fixture 4. Preferably, after the part 1 is fixed, the central axis of the inclined hole 2 is along the vertical direction. After the drilling is completed, the obtained pre-drilled hole 5 is a conical hole. Figure 4 and Figure 6As shown, at this time, the leftmost edge of the pre-drilled hole 5 is parallel to the first edge line 24 of the inclined hole 2. Since 0.816D≤D1≤D, the pre-drilled hole 5 is close to or reaches the first edge line 24 of the inclined hole 2, but does not exceed the first edge line 24, thereby ensuring that the left edge of the drill bit 3 does not exceed the theoretical hole diameter. In particular, when D1=D, the leftmost edge of the pre-drilled hole 5 coincides with the first edge line 24 of the inclined hole 2, that is, the drill bit 3 reaches the theoretical rightmost edge of the inclined hole 2.

[0052] S2, see Figure 5 and Figure 6 As shown, the drill bit 3 is facing the side where the first edge point 22 of the hole is located (i.e. Figure 5 and Figure 6 The left side of the drawing) is deflected by 30°, the angle between the axis of the drill bit 3 and the machining surface plane 11 is 30°, and the angle between the axis of the drill bit 3 and the central axis of the inclined hole 2 is also 30°. The drill bit 3 is moved so that the drill tip of the drill bit 3 contacts the wall of the pre-drilled hole 5, and the distance between the contact point P0 and the central axis of the inclined hole 2 is L0, 0.079D≤L0≤0.183D, and preferably 0.183D, see Figure 6 As shown, at this time, the axis of the drill bit 3 is perpendicular to the wall of the pre-drilled hole 5 where the contact point P0 is located, that is, it is perpendicular to the rightmost edge of the pre-drilled hole 5. The drill bit 3 axially feeds a certain depth, and the drill tip reaches the position point P1. The distance L1 between the position point P1 and the center axis of the inclined hole 2 is 0.211D. Since the axis of the drill bit 3 is perpendicular to the wall of the pre-drilled hole 5 during axial feed, the drill bit 3 is not easy to deflect, and the stability of subsequent processing is guaranteed by the self-centering principle of the drill bit 3.

[0053] S3, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located, so that the movement path of the drill tip is arc-shaped. The drill tip moves 0.042D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.094D in the axial direction of the inclined hole 2. Figure 8 and Figure 7 As shown, in this step, the drill bit 3 is fed axially at a uniform speed and deflected at a uniform speed to ensure that the movement path of the drill tip is an arc, gradually moving toward the center axis of the inclined hole 2 and downward, and the movement path line is tangent to the leftmost edge of the pre-drilled hole 5 in step S2 (the side closest to the first edge line 24). The movement path of the drill tip is located in the cross-sectional plane formed by the first edge line 24 and the second edge line 25, ensuring that the left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, does not exceed the theoretical aperture. The machining allowance of this step includes two parts, A1 and B1, located on the left and right sides of the drill tip trajectory respectively. The cutting force of the A1 part on the drill bit 3 offsets the cutting force of the B1 part to form the optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position point P1 to position point P2, the angle between the axis of the drill bit 3 and the processing surface plane 11 is 35°, and the angle between the center axis of the inclined hole 2 is 25°.

[0054] S4, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.040D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.107D in the axial direction of the inclined hole 2. Figure 8 and Figure 7 As shown, in this step, the drill bit 3 is fed axially at a uniform speed and deflected at a uniform speed to ensure that the movement path of the drill tip is an arc, gradually moving toward the center axis of the inclined hole 2 and downward, and the movement path line is tangent to the movement path line of the drill tip in step S3. The movement path of the drill tip is located in the cross-sectional plane formed by the first edge line 24 and the second edge line 25. The left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, it does not exceed the theoretical aperture. The machining allowance of this step includes two parts, A2 and B2, located on the left and right sides of the drill tip trajectory respectively. The cutting force of part A2 on the drill bit 3 offsets the cutting force of part B2 to form the optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position point P2 to position point P3, the angle between the axis of the drill bit 3 and the machining surface plane 11 is 40°, and the angle between the center axis of the inclined hole 2 is 20°.

[0055] S5, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.037D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.126D in the axial direction of the inclined hole 2. Figure 8 and Figure 7 As shown, in this step, the drill bit 3 is fed axially at a uniform speed and deflected at a uniform speed to ensure that the movement path of the drill tip is an arc, gradually moving toward the center axis of the inclined hole 2 and downward, and the movement path line is tangent to the movement path line of the drill tip in step S4. The movement path of the drill tip is located in the cross-sectional plane formed by the first edge line 24 and the second edge line 25. The left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, it does not exceed the theoretical aperture. The machining allowance of this step includes two parts, A3 and B3, located on the left and right sides of the drill tip trajectory respectively. The cutting force of the A3 part on the drill bit 3 offsets the cutting force of the B3 part to form the optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position point P3 to position point P4. The angle between the axis of the drill bit 3 and the machining surface plane 11 is 45°, and the angle between the axis of the drill bit 3 and the center axis of the inclined hole 2 is 15°.

[0056] S6, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.035D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.148D in the axial direction of the inclined hole 2. Figure 8 and Figure 7As shown, in this step, the drill bit 3 is fed axially at a uniform speed and deflected at a uniform speed to ensure that the movement path of the drill tip is an arc, gradually moving toward the center axis of the inclined hole 2 and downward, and the movement path line is tangent to the movement path line of the drill tip in step S5. The movement path of the drill tip is located in the cross-sectional plane formed by the first edge line 24 and the second edge line 25. The left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, it does not exceed the theoretical aperture. The machining allowance of this step includes two parts, A4 and B4, located on the left and right sides of the drill tip trajectory respectively. The cutting force of the A4 part on the drill bit 3 offsets the cutting force of the B4 part to form the optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position point P4 to position point P5. The angle between the axis of the drill bit 3 and the machining surface plane 11 is 50°, and the angle between the axis of the drill bit 3 and the center axis of the inclined hole 2 is 10°.

[0057] S7, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.030D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.202D in the axial direction of the inclined hole 2. Figure 8 and Figure 7 As shown, in this step, the drill bit 3 is fed axially at a uniform speed and deflected at a uniform speed to ensure that the movement path of the drill tip is an arc, gradually moving toward the center axis of the inclined hole 2 and downward, and the movement path line is tangent to the movement path line of the drill tip in step S6. The movement path of the drill tip is located in the cross-sectional plane formed by the first edge line 24 and the second edge line 25. The left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, it does not exceed the theoretical aperture. The machining allowance of this step includes two parts, A5 and B5, located on the left and right sides of the drill tip trajectory respectively. The cutting force exerted on the drill bit 3 by the A5 part offsets the cutting force of the B5 part to form the optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position point P5 to position point P6. The angle between the axis of the drill bit 3 and the machining surface plane 11 is 55°, and the angle between the axis of the drill bit 3 and the center axis of the inclined hole 2 is 5°.

[0058] S8, the drill bit 3 is fed axially, and at the same time, the drill bit 3 is gradually deflected 5° toward the side where the first edge point of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.027D along the radial direction of the inclined hole 2 toward the central axis of the inclined hole 2, and moves 0.478D in the axial direction of the inclined hole 2. Figure 8 and Figure 7As shown, in this step, the drill bit 3 is fed axially at a constant speed and deflected at a constant speed, ensuring that the drill tip's motion path is an arc, gradually moving toward and downward from the center axis of the inclined hole 2. The motion path is tangent to the drill tip's motion path in step S7, and the lower end of the drill tip's motion trajectory is tangent to the center axis of the inclined hole 2. The drill tip's motion path lies within the cross-sectional plane formed by the first edge line 24 and the second edge line 25. The left edge of the drill bit 3 does not exceed the first edge line 24 on the left, that is, it does not exceed the theoretical aperture. The machining allowance for this step includes two parts, A6 and B6, located on the left and right sides of the drill tip's trajectory, respectively. The cutting force exerted by part A6 on the drill bit 3 offsets that of part B6, resulting in an optimal path. At the end of this step, the drill tip of the drill bit 3 moves from position P6 to position P7. The drill bit 3 axis forms an angle of 60° with the machining surface plane 11 and a 0° angle with the center axis of the inclined hole 2. The leftmost position of both drill tips is located at the second edge point 23 of the orifice of the inclined hole 2.

[0059] S9, the drill bit 3 drills axially along the axis of the inclined hole 2 to a specified depth to obtain the inclined hole 2. In this step, the drill bit 3 always feeds along the axis of the inclined hole 2, which is a normal cutting state, and the radial cutting forces offset each other.

[0060] In this embodiment, see Figure 1 and Figure 3 , the part 1 can be a regular hexagon, and the machining surface plane 11 is one of the six sides of the regular hexagon. The inclined hole 2 is a through hole. In this case, in step S9, the drill bit 3 drills through the inclined hole. Of course, in other embodiments, the inclined hole 2 can also be a blind hole. In this case, in step S9, the drilling is not completed, but stops at a specified depth.

[0061] In this embodiment, preferably, when the regular hexagonal part 1 is fixed by the clamp 4, the angle between the machining surface plane 11 and the horizontal plane is 60°, and the central axis of the inclined hole 2 is vertical. At this time, the drill bit 3 in step S9 is vertical, which facilitates processing, especially when the drilling depth is large.

[0062] See also Figure 8 As shown, a coordinate system is established with position point P7 as the origin, the direction along the radial direction of the inclined hole 2 and passing through the second edge line 25 as the X-axis, and the central axis of the inclined hole 2 as the Y-axis. At this time, the left sides of position points P1 to P7 are (-0.211D, 1155D), (-0.169D, 1.061D), (-0.129D, 0.954D), (-0.092D, 0.828D), (-0.057D, 0.680D), (-0.027D, 0.478D) and (0, 0) respectively.

[0063] The processing method of the present invention has the following beneficial effects:

[0064] 1. A new drilling method is provided. In the initial, relatively short period of drilling, a short hole is first drilled using steps S2 and S3. The drill bit 3 remains perpendicular to the contacted surface, ensuring uniform force distribution. This prevents center deviation and the resulting bell-mouth phenomenon caused by uneven force distribution at the contact point. Then, using steps S4 to S8, the drill bit 3 is fed axially while deflecting, continuously drilling a short distance. When the edge of the drill bit 3 is at the second edge point 23 of the hole opening, the drill bit 3 is aligned axially with the axial direction of the inclined hole 2, and normal drilling is then resumed.

[0065] 2. High processing efficiency, low cost, and maximum utilization of the cutting performance of the drill bit 3.

[0066] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for machining an inclined hole on a surface of a part, wherein the angle between the central axis of the inclined hole (2) and the machining surface (11) of the part (1) in which it is located is 30°, the diameter of the inclined hole (2) is D, the intersection point of the central axis of the inclined hole (2) and the machining surface (11) is the center point (21) of the hole opening, the hole opening of the inclined hole (2) on the machining surface (11) is elliptical, and the two edge points on the long axis are respectively the first edge point (22) of the hole opening and the second edge point (23) of the hole opening, the angle between the line connecting the second edge point (23) of the hole opening and the center point (21) of the hole opening and the central axis of the inclined hole (2) is 30°, the edge lines of the side wall of the inclined hole (2) extending along the axis at the first edge point (22) of the hole opening and the second edge point (23) of the hole opening are respectively the first edge line (24) and the second edge line (25), and the method is characterized in that: The processing method comprises the following steps in sequence: S1, using a drill bit (3) with a drill point angle θ of 120° for processing, and the diameter of the drill bit (3) is D; S2, the part (1) is fixed, the axis of the drill bit (3) is perpendicular to the machining surface plane (11), the drill tip of the drill bit (3) contacts the machining surface plane (11) and is located on the straight line between the first edge point (22) of the hole and the center point (21) of the hole, and the offset distance between the drill tip and the center point (21) of the hole is D / 2; the drill bit (3) is axially fed, and the drilling depth is 3 0.5 *D1 / 6, 0.816D≤D1≤D; then the drill bit (3) is axially retracted to obtain a pre-drilled hole (5) on the machining surface (11); The drill bit (3) is deflected 30° toward the side where the first edge point (22) of the hole is located, and the angle between the axis of the drill bit (3) and the processing surface plane (11) is 30°. The drill bit (3) is moved so that the drill tip of the drill bit (3) contacts the wall of the pre-drilled hole (5), and the distance L0 between the contact point P0 and the central axis of the inclined hole (2) is 0.079D to 0.183D. The drill bit (3) is axially fed to drill a certain depth, and the drill tip reaches the position point P1. The distance L1 between the position point P1 and the central axis of the inclined hole (2) is 0.211D. S3, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located, so that the movement path of the drill tip is arc-shaped, and the drill tip moves 0.042D toward the central axis of the inclined hole (2) in the radial direction of the inclined hole (2) and moves 0.094D in the axial direction of the inclined hole (2); S4, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.040D along the radial direction of the inclined hole (2) toward the central axis of the inclined hole (2), and moves 0.107D in the axial direction of the inclined hole (2); S5, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located. The movement path of the drill tip is arc-shaped. The drill tip moves 0.037D along the radial direction of the inclined hole (2) toward the central axis of the inclined hole (2), and moves 0.126D in the axial direction of the inclined hole (2); S6, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located, and the movement path of the drill tip is arc-shaped. The drill tip moves 0.035D along the radial direction of the inclined hole (2) toward the central axis of the inclined hole (2), and moves 0.148D in the axial direction of the inclined hole (2); S7, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located, and the movement path of the drill tip is arc-shaped. The drill tip moves 0.030D along the radial direction of the inclined hole (2) toward the central axis of the inclined hole (2), and moves 0.202D in the axial direction of the inclined hole (2); S8, the drill bit (3) is fed axially, and at the same time, the drill bit (3) is gradually deflected 5° toward the side where the first edge point (22) of the hole is located, and the movement path of the drill tip is arc-shaped. The drill tip moves 0.027D along the radial direction of the inclined hole (2) toward the central axis of the inclined hole (2), and moves 0.478D in the axial direction of the inclined hole (2); S9, the drill bit (3) drills axially along the axis direction of the inclined hole (2) to a specified depth to obtain the inclined hole (2).

2. The method for machining an inclined hole on a part surface according to claim 1, characterized in that: In step S2, D1=D.

3. The method for machining an inclined hole on a part surface according to claim 1, characterized in that: In the steps S3 to S8, the drill bit (3) is fed axially at a uniform speed and deflected at a uniform speed.

4. The method for machining an inclined hole on a part surface according to claim 1, characterized in that: In step S3, the movement trajectory of the drill bit (3) is tangent to the side of the pre-drilled hole in step S2 that is closest to the first edge line (24).

5. The method for machining an inclined hole on a part surface according to claim 4, characterized in that: In the steps S4 to S8, the motion trajectory of the drill bit (3) is tangent to the motion trajectory of the drill bit (3) in the previous step.

6. The method for machining an inclined hole on a part surface according to claim 4, characterized in that: The part (1) is a regular hexagon, and the machining surface plane (11) is one of the six sides of the regular hexagon. The inclined hole (2) is a through hole. In step S9, the drill bit (3) drills through the hole.

7. The method for machining an inclined hole on a part surface according to claim 1 or 6, characterized in that: In the step S2, after the part (1) is fixed, the angle between the machining surface plane (11) and the horizontal plane is 60°, and the central axis of the inclined hole (2) is vertical.

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