Adjustable taper boring tool and stepped hole processing method

Abstract

The application discloses a taper hole boring tool with adjustable taper and a stepped hole processing method, and belongs to the technical field of machining. The taper hole boring tool and the stepped hole processing method adjust the taper hole boring taper adjusting knob, drive the lead screw to rotate, and make the radial sliding block move along the horizontal direction of the slide support. The radial sliding block drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial sliding block to move along the vertical direction of the slide support, and the boring bar angle rail is kept consistent with the angle of the taper hole. The angle of the boring bar angle rail is adjusted according to the taper hole angle requirement on the drawing, the relative position of the boring bar angle rail and the boring bar support is changed through the transmission rod, the horizontal direction displacement of the boring bar support is transmitted to the large-diameter boring bar or the small-diameter boring bar, and thus the boring machining of taper holes with different angles is realized, the universality of the device is improved, and the customization cost of the forming tool is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical processing, and particularly relates to a taper hole boring tool with adjustable taper and a stepped hole processing method. BACKGROUND

[0002] In numerical control milling processing, most parts have taper holes or stepped hole elements. At present, the following two processing technologies are commonly used for processing such holes:

[0003] Forming tool: according to the dimensional accuracy requirement on the drawing, a forming tool matching the size of the taper hole is customized, and the taper hole or stepped hole with the corresponding profile shape is processed through the profile shape of the tool.

[0004] Disadvantages: the forming tool is a fixed-size tool, the dimensional accuracy of the taper hole or stepped hole cannot be adjusted, and only the taper hole or stepped hole with the same size as the tool can be processed, which has poor versatility.

[0005] The forming tool is a non-standard tool, and the customization cycle is long and the cost is high.

[0006] CAM software tool path fitting: the CAM software is applied to generate the fitting tool path of the taper hole surface, the circular arc point of the ball end mill is used to process the taper hole surface, and the ball end mill is layered to fit the shape of the taper hole.

[0007] Disadvantages: the circular arc point of the ball tool is used to fit the taper surface shape, and the tool path needs to be arranged very densely to fit the spatial surface with point positions, so the roughness of the processed surface is low and the processing efficiency is low.

[0008] If the taper hole element is in a deep hole position, a long ball mill needs to be used to avoid interference between the tool handle and the part. Due to the influence of tool strength, the taper hole surface will have a shake mark, which affects the surface quality and dimensional accuracy. SUMMARY

[0009] In view of the processing problem of the taper hole or stepped hole transition taper on the part in the prior art, the present application provides a taper hole boring tool with adjustable taper and a stepped hole processing method, which can improve the surface quality and processing efficiency and reduce the trial production cost.

[0010] The present application is realized through the following technical solutions:

[0011] The adjustable taper hole boring cutter comprises a milling machine tool handle 1, a taper hole boring cutter blade 6, a large-diameter boring cutter rod 7 and a taper hole boring cutter head; the taper hole boring cutter head is a large-diameter taper hole boring cutter head 3 or a small-diameter taper hole boring cutter head 9; the large-diameter taper hole boring cutter head 3 or the small-diameter taper hole boring cutter head 9 is connected with the milling machine tool handle 1 through a small hole and a matching thread; the large-diameter boring cutter rod 7 is matched and installed on the large-diameter taper hole boring cutter head 3 through a sliding block 13, the small-diameter boring cutter rod 10 is matched and installed on the small-diameter taper hole boring cutter head 9 through a sliding block 13, the taper hole boring cutter blade 6 is threadedly connected with the large-diameter taper hole boring cutter head 3 or the small-diameter taper hole boring cutter head 9, and the boring of taper holes with different angles is realized by controlling the moving speed of the large-diameter boring cutter rod 7 or the small-diameter boring cutter rod 10 in the radial direction of the milling machine tool handle 1.

[0012] Further, a sliding channel support 11 is arranged in the milling machine tool handle 1, the lower end of the sliding channel support 11 is fixedly connected with a transmission rod 4, the outer cylindrical surface of the transmission rod 4 is slidingly and matchingly connected with the lower end of the large-diameter taper hole boring cutter head 3 or the small-diameter taper hole boring cutter head 9, and the transmission rod 4 can move along the axis direction of the milling machine tool handle 1.

[0013] Further, the sliding channel support 11 is L-shaped, is provided with dovetail type guide rails thereon, is provided with a radial sliding block 14 on the transversely arranged guide rail, and is provided with an axial sliding block 12 on the vertically arranged guide rail.

[0014] Further, the taper hole boring cutter further comprises a boring cutter rod angle rail 15, both ends of the boring cutter rod angle rail 15 are respectively installed on the axial sliding block 12 of the sliding channel support 11 and the radial sliding block 14 of the sliding channel support 11 through bearings and cylindrical pins, and can rotate around the cylindrical pins.

[0015] Further, the taper hole boring cutter further comprises a boring hole taper adjusting knob 8, the boring hole taper adjusting knob 8 is connected with the main body shell of the large-diameter taper hole boring cutter head 3 or the small-diameter taper hole boring cutter head 9 through a bearing, the boring hole taper adjusting knob 8 is connected with the radial sliding block 14 installed on the sliding channel support 11 through a lead screw, the boring hole taper adjusting knob 8 drives the radial sliding block 14 to move through the lead screw transmission, the radial sliding block 14 drives the boring cutter rod angle rail 15 and the axial sliding block 12 to move, so as to adjust the angle of the boring cutter rod angle rail 15 and realize the boring hole taper adjustment, and after the adjustment is completed, the boring hole taper adjusting knob 8 can be separated from the lead screw, without affecting the movement of the boring cutter rod angle rail.

[0016] Further, a hole adjusting locking knob 2 is arranged at a position 90 degrees away from the boring hole taper adjusting knob 8, and is used for clamping and loosening the end of the lead screw driven by the boring hole taper adjusting knob 8; when clamped, the lead screw is kept in a locked state and no longer rotates, and the angle position of the boring cutter rod angle rail 15 is kept.

[0017] Further, the end of the large-diameter boring bar 7 or the small-diameter boring bar 10 is connected with a boring bar support 16, the upper end of the boring bar support 16 is connected with the boring bar angle rail 15 through a bearing and a slide rail, the boring bar support 16 can slide in the boring bar angle rail 15; the horizontal direction displacement of the boring bar support 16 can be transmitted to the large-diameter boring bar 7 or the small-diameter boring bar 10.

[0018] Further, the lower end of the transmission rod 14 is connected with a transmission extension rod 5, the transmission rod 14 and the transmission extension rod 5 are connected through a thread.

[0019] On the other hand, the application further provides a stepped hole processing method of a taper hole boring tool with adjustable taper, specifically including the following steps:

[0020] S1, straight hole processing;

[0021] S2, taper hole processing, including:

[0022] S21, according to the size of the taper hole diameter on the drawing, selecting a corresponding stroke and specification of the taper hole boring tool for rough boring and fine boring of the taper hole;

[0023] S22, adjusting the boring hole taper adjusting knob, driving the lead screw to rotate, making the radial slide block move along the horizontal direction of the slide rail support; at the same time, the radial slide block drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial slide block to move along the vertical direction of the slide rail support, so that the angle of the boring bar angle rail is consistent with the angle of the taper hole; after adjusting the taper, rotating the taper hole adjusting locking knob, the top wire is clamped on the locking strip, the axial slide block is fixed, so that the angle of the boring bar angle rail is fixed;

[0024] S23, taper hole rough boring: calculating the depth distance from the starting end to the ending end of the taper hole, adjusting the position of the transmission rod, so that the boring diameter of the taper hole boring tool is the large circle diameter of the starting end of the taper hole; adjusting the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom; at this time, with the downward cutting of the milling tool handle, the taper hole boring tool blade starts to move along the radial direction to the direction of reducing the boring diameter before reaching the depth of the starting end of the taper hole, at this time, a margin will be left on the surface of the taper hole for finishing;

[0025] S24, taper hole fine boring: adjusting the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom, the vertical direction displacement distance of the boring bar angle rail is the distance from the starting end of the taper hole to the hole bottom, the radial direction moving distance of the taper hole boring tool blade driven by the boring bar support is the radius change range of the taper hole from the starting end to the ending end circle, the boring bar changes with the downward cutting speed of the milling tool handle, and the taper hole is bored.

[0026] Further, step S1 includes the following content:

[0027] According to the size requirement of the stepped hole on the drawing, drill bits with the same diameter as the two straight holes are prepared respectively for straight hole machining; first, a small diameter drill bit is used to machine to the hole bottom, and then a large diameter drill bit is used to machine to the position where the shoulder part reaches the intersection of the straight hole and the tapered hole.

[0028] Compared with the prior art, the advantages of the present application are as follows:

[0029] The tapered hole boring tool with adjustable taper and the stepped hole machining method can control the moving speed of the boring tool rod in the radial direction by adjusting the taper angle of the adjusting device, so as to realize the boring machining of tapered holes with different angles, improve the universality of the device, and reduce the customization cost of the forming tool. The tapered hole is machined by boring, and the boring diameter range of the tapered hole boring tool changes with the cutting speed of the milling tool handle, which can greatly improve the surface quality and machining efficiency of the tapered hole. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0031] Figure 1 It is a schematic diagram of a large-diameter tapered hole boring tool;

[0032] Figure 2 It is a schematic diagram of a small-diameter tapered hole boring tool;

[0033] Figure 3 It is a schematic diagram of the internal transmission structure;

[0034] Figure 4 It is a schematic diagram of the internal transmission structure;

[0035] Figure 5 It is a machining schematic diagram;

[0036] In the drawings: milling tool handle 1, tapered hole adjusting and locking knob 2, large-diameter tapered hole boring tool bit 3, transmission rod 4, transmission extension rod 5, tapered hole boring tool blade 6, large-diameter boring tool rod 7, boring hole taper adjusting knob 8, small-diameter tapered hole boring tool bit 9, small-diameter boring tool rod 10, slide way support 11, axial slide block 12, boring tool rod slide way 13, radial slide block 14, boring tool rod angle track 15, boring tool rod support 16. DETAILED DESCRIPTION

[0037] For clearly and completely describing the technical solutions of the present application and the specific working process thereof, the specific embodiments of the present application are as follows in combination with the drawings in the specification.

[0038] In the present application, unless specifically defined otherwise and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0041] Embodiment 1

[0042] As Figures 1-4As shown, the embodiment provides a taper hole boring tool with adjustable taper, which comprises a milling machine tool holder 1, a taper hole boring tool blade 6, a large diameter boring tool rod 7 and a taper hole boring tool head; the taper hole boring tool head is a large diameter taper hole boring tool head 3 or a small diameter taper hole boring tool head 9; the large diameter taper hole boring tool head 3 or the small diameter taper hole boring tool head 9 is connected with the milling machine tool holder 1 through a small hole and a screw thread; the large diameter boring tool rod 7 is installed on the large diameter taper hole boring tool head 3 through a sliding block 13, the small diameter boring tool rod 10 is installed on the small diameter taper hole boring tool head 9 through a sliding block 13, the taper hole boring tool blade 6 is connected with the large diameter taper hole boring tool head 3 or the small diameter taper hole boring tool head 9 through a screw thread, and the boring of taper holes with different angles is realized by controlling the moving speed of the large diameter boring tool rod 7 or the small diameter boring tool rod 10 in the radial direction of the milling machine tool holder 1.

[0043] As shown, Figure 3 The milling machine tool holder 1 is provided with a sliding way support 11, the lower end of the sliding way support 11 is fixedly connected with a transmission rod 4, the outer cylindrical surface of the transmission rod 4 is in sliding fit with the lower end of the large diameter taper hole boring tool head 3 or the small diameter taper hole boring tool head 9, and the transmission rod 4 can move along the axis direction of the milling machine tool holder 1.

[0044] The sliding way support 11 is in L shape, is provided with dovetail type guide rails thereon, is provided with a radial sliding block 14 on the horizontally arranged guide rail, and is provided with an axial sliding block 12 on the vertically arranged guide rail.

[0045] The taper hole boring tool further comprises a boring tool rod angle rail 15, both ends of the boring tool rod angle rail 15 are respectively installed on the axial sliding block 12 of the sliding way support 11 and the radial sliding block 14 of the sliding way support 11 through bearings and cylindrical pins, and can rotate around the cylindrical pins.

[0046] The taper hole boring tool further comprises a boring hole taper adjusting knob 8, the boring hole taper adjusting knob 8 is connected with the main body shell of the large diameter taper hole boring tool head 3 or the small diameter taper hole boring tool head 9 through a bearing, the boring hole taper adjusting knob 8 is connected with the radial sliding block 14 installed on the sliding way support 11 through a lead screw, moves by the transmission of the lead screw, drives the radial sliding block 14 to move, drives the boring tool rod angle rail 15 and the axial sliding block 12 to move, thereby adjusting the angle of the boring tool rod angle rail 15, realizing the boring hole taper adjustment, and after the adjustment is completed, the boring hole taper adjusting knob 8 can be separated from the lead screw, without affecting the movement of the boring tool rod angle rail.

[0047] A hole adjusting locking knob 2 is arranged at a position 90 degrees away from the boring hole taper adjusting knob 8, and is used for clamping and loosening the end of the lead screw driven by the boring hole taper adjusting knob 8; when clamped, the lead screw is kept in a locked state and no longer rotates, and the angle position of the boring tool rod angle rail 15 is kept.

[0048] The end of the large-diameter boring bar 7 or the small-diameter boring bar 10 is connected to a boring bar bracket 16. The upper end of the boring bar bracket 16 is connected to the boring bar angle rail 15 through a bearing and a slide rail. The boring bar bracket 16 can slide within the boring bar angle rail 15. The horizontal displacement of the boring bar bracket 16 can be transmitted to the large-diameter boring bar 7 or the small-diameter boring bar 10.

[0049] The lower end of the transmission rod 14 is connected to the transmission extension rod 5, and the transmission rod 14 and the transmission extension rod 5 are connected by threads.

[0050] like Figure 5 As shown, the working principle of an adjustable taper boring tool in this embodiment is as follows:

[0051] By adjusting the boring taper adjustment knob, the lead screw rotates, causing the radial slider to move horizontally along the slide rail support. Simultaneously, the radial slider moves the upper end of the boring bar angle rail, which in turn pushes the axial slider vertically along the slide rail support, ensuring the boring bar angle rail maintains the same angle as the tapered hole. The angle of the boring bar angle rail can be adjusted according to the tapered hole angle requirements on the drawing. The relative position of the boring bar angle rail and the boring bar support is changed via a transmission rod, transmitting the horizontal displacement of the boring bar support to either a large-diameter or small-diameter boring bar. This enables boring of tapered holes at different angles, improving the versatility of the device and reducing the customization cost of forming tools. The tapered hole is machined using a boring process; the boring diameter range of the tapered hole boring tool varies with the cutting speed of the milling machine tool holder, significantly improving the surface quality and machining efficiency of the tapered hole.

[0052] Example 2

[0053] like Figure 5 As shown, the stepped hole consists of two straight holes of different diameters, with a tapered hole connecting adjacent holes. Taking this stepped hole as an example, the specific implementation method and processing method of this embodiment are illustrated, including the following steps:

[0054] Step 1: Machining straight holes:

[0055] Based on the dimensions of the stepped holes in the drawing, prepare drill bits with the same diameter as the two straight holes for machining the straight holes. First, use the small-diameter drill bit to machine to the bottom of the hole, and then use the large-diameter drill bit to machine to the shoulder area and the position where the straight hole and the tapered hole meet.

[0056] Step 2: Tapered hole machining:

[0057] (1) Select a tapered hole boring tool with the appropriate stroke and specifications according to the diameter of the tapered hole on the drawing for rough boring and fine boring of the tapered hole.

[0058] (2), adjust the boring taper adjusting knob, drive the screw rod to rotate, make the radial slider move along the horizontal direction of the slide support. At the same time, the radial slider drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial slider to move along the vertical direction of the slide support, so that the angle of the boring bar angle rail and the taper hole is consistent. After adjusting the taper, rotate the taper hole adjusting locking knob, the top wire is on the locking strip, the locking strip fixes the axial slider, so that the angle of the boring bar angle rail is fixed;

[0059] (3), rough boring of the taper hole: calculate the depth distance from the starting end to the end of the taper hole, adjust the position of the transmission rod, so that the boring diameter of the taper hole boring tool is the major diameter of the starting end of the taper hole; Adjust the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom. At this time, with the downward cutting of the milling tool handle, the taper hole boring tool blade starts to move along the radial direction to the boring diameter reduction direction before reaching the starting end depth of the taper hole, which will leave a margin on the surface of the taper hole for finishing.

[0060] (4), fine boring of the taper hole: adjust the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom, so that the vertical displacement distance of the boring bar angle rail is the distance from the starting end of the taper hole to the hole bottom, and the radial movement distance of the taper hole boring tool blade driven by the boring bar support is the radius change range of the taper hole starting end to the taper hole end circle. The boring bar changes with the downward cutting speed of the milling tool handle, and the taper hole is bored.

[0061] The machining method of the embodiment adjusts the boring taper adjusting knob, drives the screw rod to rotate, and makes the radial slider move along the horizontal direction of the slide support. At the same time, the radial slider drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial slider to move along the vertical direction of the slide support, so that the angle of the boring bar angle rail and the taper hole is consistent. The angle of the boring bar angle rail can be adjusted according to the taper angle requirement on the drawing, the relative position of the boring bar angle rail and the boring bar support is changed through the transmission rod, the horizontal direction displacement of the boring bar support is transmitted to the large diameter boring bar or the small diameter boring bar, so that the boring machining of taper holes with different angles is realized, the universality of the device is improved, and the customization cost of the forming tool is reduced. The taper hole adopts boring machining process, the boring diameter range of the taper hole boring tool changes with the downward cutting speed of the milling tool handle, which can greatly improve the surface quality and machining efficiency of the taper hole.

[0062] The preferred embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the specific details in the above embodiments. Within the technical concept of the application, various simple modifications can be made to the technical solutions of the application, and these simple modifications all belong to the protection scope of the application.

[0063] It should be further noted that each of the various technical features described in the above embodiments can be combined with any other technical features in any suitable manner, and the present application shall be deemed to disclose all possible combinations thereof, without causing unnecessary repetition.

[0064] Furthermore, any combination of the various embodiments of the present application can be made, as long as it does not deviate from the spirit of the present application, and it shall be deemed to be disclosed by the present application.

Claims

1. An adjustable tapering taper hole boring tool, characterized by, The utility model relates to a milling machine tool holder (1), taper hole boring tool blade (6), big diameter boring tool rod (7) and taper hole boring tool head, the taper hole boring tool head is big diameter taper hole boring tool head (3) or small diameter taper hole boring tool head (9), big diameter taper hole boring tool head (3) or small diameter taper hole boring tool head (9) is connected through small hole cooperation thread on milling machine tool holder (1), big diameter boring tool rod (7) is installed through sliding block (13) cooperation on big diameter taper hole boring tool head (3), small diameter boring tool rod (10) is installed through sliding block (13) cooperation on small diameter taper hole boring tool head (9), big diameter taper hole boring tool head (3) or small diameter taper hole boring tool head (9) threadedly connected have taper hole boring tool blade (6), by controlling big diameter boring tool rod (7) or small diameter boring tool rod (10) in along the radial direction of milling machine tool holder (1) moving speed, thereby realize the boring of different angle taper hole processing, The milling machine tool holder (1) is provided with a slide bracket (11), the lower end of the slide bracket (11) is fixedly connected with a transmission rod (4), the outer cylindrical surface of the transmission rod (4) is in sliding fit connection with the lower end of the big diameter taper hole boring tool head (3) or the small diameter taper hole boring tool head (9), and the transmission rod (4) can move along the axial direction of the milling machine tool holder (1). The slide bracket (11) is L-shaped, and is provided with swallow-tail type guide rails thereon, a radial sliding block (14) is installed on the horizontally arranged guide rail, and an axial sliding block (12) is installed on the vertically arranged guide rail. The taper hole boring tool further comprises a boring tool rod angle rail (15), both ends of the boring tool rod angle rail (15) are installed on the axial sliding block (12) of the slide bracket (11) and the radial sliding block (14) of the slide bracket (11) through bearings and cylindrical pins, and can rotate around the cylindrical pins. The taper hole boring tool further comprises a boring hole taper adjusting knob (8), the boring hole taper adjusting knob (8) is connected with the main body shell of the big diameter taper hole boring tool head (3) or the small diameter taper hole boring tool head (9) through a bearing, the boring hole taper adjusting knob (8) is connected with the radial sliding block (14) installed on the slide bracket (11) through a lead screw, moves by being driven by the lead screw, the radial sliding block (14) drives the boring tool rod angle rail (15) and the axial sliding block (12) to move, so as to adjust the angle of the boring tool rod angle rail (15) and realize boring hole taper adjustment, after the adjustment is completed, the boring hole taper adjusting knob (8) can be separated from the lead screw, and the movement of the boring tool rod angle rail is not affected. A taper hole adjusting locking knob (2) is arranged at a position 90 degrees away from the boring hole taper adjusting knob (8), and is used for clamping and loosening the end of the lead screw driven by the boring hole taper adjusting knob (8); when clamping, the lead screw is kept in a locked state and no longer rotates, and the angle position of the boring tool rod angle rail (15) is kept. The lower end of the transmission rod (4) is connected with a transmission extension rod (5), and the transmission rod (4) and the transmission extension rod (5) are connected through threads.

2. A taper boring tool with adjustable taper according to claim 1, characterized in that The end of the large-diameter boring bar (7) or the small-diameter boring bar (10) is connected with a boring bar support (16), the upper end of the boring bar support (16) is connected with a boring bar angle rail (15) through a bearing, and the boring bar support (16) can slide in the boring bar angle rail (15); the horizontal direction displacement of the boring bar support (16) can be transmitted to the large-diameter boring bar (7) or the small-diameter boring bar (10).

3. The method for machining stepped holes with an adjustable taper taper boring tool as described in claim 1, characterized in that, Specifically includes the following steps: S1, straight hole processing; S2, taper hole processing, including: S21, according to the taper hole diameter size on the drawing, selecting the corresponding stroke and specification of the taper hole boring tool for rough boring and fine boring of the taper hole; S22, adjusting the boring hole taper adjusting knob, driving the lead screw to rotate, making the radial slide block move along the horizontal direction of the slide rail support; at the same time, the radial slide block drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial slide block to move along the vertical direction of the slide rail support, so that the angle of the boring bar angle rail is consistent with the angle of the taper hole; after adjusting the taper, rotating the taper adjusting locking knob to fix the angle of the boring bar angle rail; S23, taper hole rough boring: calculating the depth distance from the starting end to the ending end of the taper hole, adjusting the position of the transmission rod, so that the boring diameter of the taper hole boring tool is the major diameter of the starting end of the taper hole; adjusting the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom; at this time, with the downward cutting of the milling tool handle, the taper hole boring tool blade starts to move along the radial direction to the direction of reducing the boring diameter before reaching the depth of the starting end of the taper hole, which will leave a margin on the surface of the taper hole for finishing; S24, taper hole fine boring: adjusting the length of the transmission extension rod, so that the distance from the tip of the taper hole boring tool blade to the end of the transmission extension rod is greater than the distance from the starting end of the taper hole to the hole bottom, and the vertical direction displacement distance of the boring bar angle rail is the distance from the starting end of the taper hole to the hole bottom; the boring bar support drives the taper hole boring tool blade to move in the radial direction, and the moving distance of the boring bar support is the change range of the radius of the taper hole from the starting end to the ending end of the taper hole; the boring bar changes the downward cutting speed of the milling tool handle, and the taper hole is bored.

4. A method of stepped hole machining of an adjustable-taper taper hole boring tool according to claim 3, wherein The step S1 includes the following contents: According to the size requirements of the stepped hole on the drawing, two drill bits with the same diameter as the two straight holes are prepared for straight hole processing; first, a small-diameter drill bit is used to process to the hole bottom, and then a large-diameter drill bit is used to process to the position where the straight hole and the taper hole meet.

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