High-precision composite boring tool for machining elongated spaced holes

Abstract

The utility model relates to a kind of high-precision composite boring cutters for slender interval hole processing, it includes: boring bar, boring bar is long cylinder, boring bar is provided with multiple rough boring cutter head hole, multiple fine boring cutter head hole, wherein, the center line of rough boring cutter head hole is parallel with the center line of fine boring cutter head hole;Rough boring cutter head, rough boring cutter head is set in rough boring cutter head hole, for the rough boring of workpiece to be processed;Fine boring cutter head, fine boring cutter head is set in fine boring cutter head hole, for the fine boring of workpiece to be processed, a rough boring cutter head hole and a fine boring cutter head hole form a group, the distance of each rough boring cutter head hole and each fine boring cutter head hole distance is equal, the distance of each rough boring cutter head hole and the position to be processed of workpiece to be processed correspond. According to the high-precision composite boring cutter for slender interval hole processing of the utility model, multiple interval holes of workpiece with large length-diameter ratio can be machined simultaneously, and the problem of large machining hole error caused by two-end tool setting machining is avoided.

Description

Technical Field

[0001] This utility model relates to the field of equipment processing technology, and more specifically, to a high-precision composite boring tool for machining long and narrow spaced holes. Background Technology

[0002] When machining long, narrow, spaced holes in diesel engines, such as camshaft support bearing holes and crankshaft center holes, these holes have a large length-to-diameter ratio and multiple spaced holes. Traditional machining methods typically use two tools, roughing and finishing, for boring. Because the holes are spaced far apart and numerous, traditional tools have poor rigidity, requiring alignment at both ends. This results in poor coaxiality, inconsistent quality, and low efficiency. Furthermore, after rough boring, a finishing boring tool must be used, necessitating realignment of the tools. This creates a misalignment between the roughing and finishing tools, leading to large dimensional and positional tolerances in the long, spaced holes.

[0003] Currently, the machining of long, narrow, spaced holes in a diesel engine using two boring tools (roughing and finishing) has the following drawbacks: 1) During machining, due to the poor rigidity of traditional tool holders, it is necessary to perform head-to-head machining at both ends, resulting in poor coaxiality, unstable quality, and low efficiency of the machined holes; 2) Using two boring tools (roughing and finishing) requires realigning the tool position when changing to the finishing tool, causing a certain deviation in the alignment position of the roughing and finishing tools, resulting in large form and position tolerances and low machining efficiency for the long, spaced holes; 3) Changing between the roughing and finishing boring tools requires manual tool changing and alignment, which has a significant impact from human factors.

[0004] Therefore, there is an urgent need to develop a boring tool that can simultaneously machine multiple spaced holes on workpieces with a large length-to-diameter ratio, avoiding the problem of large errors in the machined holes caused by machining at both ends. Summary of the Invention

[0005] The technical problem this invention aims to solve is to process multiple spaced holes simultaneously on workpieces with a large length-to-diameter ratio, avoiding the problem of large errors in the processed holes caused by machining the left and right ends with opposing tools.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-precision composite boring tool for machining slender, spaced holes, comprising: a boring bar, which is a long cylindrical shape, and has multiple roughing boring tool head holes and multiple finishing boring tool head holes, wherein the center line of the roughing boring tool head holes is parallel to the center line of the finishing boring tool head holes; and a roughing boring tool head, which is disposed on the roughing boring tool head. The rough boring tool is used for rough boring of the workpiece. The finish boring tool head is set in the finish boring tool head hole and is used for finish boring after rough boring of the workpiece. The rough boring tool head hole and the finish boring tool head hole form a group. The distance between each rough boring tool head hole is equal to the distance between each finish boring tool head hole. The distance between each rough boring tool head hole corresponds to the position of the workpiece to be machined.

[0007] According to an embodiment of this utility model, the center line of the precision boring tool head hole and the center line of the boring tool shank can be at a 50° angle.

[0008] According to an embodiment of this utility model, the boring bar can be provided with 2 to 5 sets of rough boring tool head holes and fine boring tool head holes. Further, the boring bar can be provided with 3 sets of rough boring tool head holes and fine boring tool head holes.

[0009] According to an embodiment of the present invention, a high-precision composite boring tool for machining elongated spaced holes may further include: a tool holder support body, wherein tool holder supports are provided at both ends of the boring bar to prevent chattering of the boring bar during machining, which would affect the surface machining quality of the elongated spaced holes.

[0010] According to an embodiment of this utility model, the rough boring tool head may include: a rough boring insert, a locking screw, a rotating adjusting screw, and a beveled slider. The rough boring insert has a tip radius of R0.4mm, and the locking screw fixes the rough boring tool head to the boring bar. The beveled slider contacts the rotating adjusting screw and is arranged along the axial direction of the rough boring tool. The beveled slider and the rotating adjusting screw are coaxial, and the rough boring insert contacts the top of the beveled slider. When the rotating adjusting screw is adjusted clockwise, the beveled slider moves upward, and the rough boring insert moves radially under the push of the beveled slider, thus increasing the diameter of the rough boring tool head. When the rotating adjusting screw is adjusted counterclockwise, the beveled slider moves downward, and the rough boring insert moves radially under the push of the beveled slider, thus decreasing the diameter of the rough boring tool head.

[0011] According to an embodiment of this utility model, the precision boring tool head may include: a precision boring insert, a fine-adjusting locking screw, and a fine-adjusting dial. The precision boring insert has a tip radius of R0.2mm. The fine-adjusting locking screw is used to fix the precision boring tool head onto the boring bar. The diameter of the precision boring insert is mainly adjusted by the bottom fine-adjusting dial to meet the machining requirements of different boring hole diameters. The fine-adjusting dial is located at the bottom of the precision boring tool, and the fine-adjusting dial and the precision boring insert are on the same axis. By rotating the fine-adjusting dial, the precision boring insert extends and retracts along the axial direction, thereby adjusting the diameter of the precision boring tool head. Furthermore, when the fine adjustment dial is rotated clockwise, the precision boring insert extends upward along the axis, increasing the diameter of the precision boring tool head; when the fine adjustment dial is rotated counterclockwise, the precision boring insert shortens downward along the axis, decreasing the diameter of the precision boring tool head; after the precision boring tool head is adjusted to the appropriate machining diameter, the fine adjustment locking screw is rotated clockwise to tighten it, fixing the precision boring tool head on the boring bar.

[0012] According to an embodiment of this utility model, when installing a fine boring tool and a rough boring tool on a boring bar, a certain distance can be left between them to ensure that during the boring process, only the axial distance of the boring bar needs to be advanced. This allows for simultaneous rough boring and fine boring of multiple camshaft support bearing holes, avoiding the need for end-to-end machining of traditional machining tools, which results in poor coaxiality, unstable quality, and low efficiency of the machined holes. By installing rough and fine boring tools at intervals on the same boring bar, the need for manual tool changing and realignment of the tool positions is avoided. This prevents deviations in the alignment of the rough and fine boring tools, which leads to larger form and position tolerances and lower machining efficiency for long-interval holes.

[0013] According to an embodiment of the present invention, a shank can be provided on the boring bar for connecting to the power output end of the machine tool spindle. In order to make the boring bar flexibly connected to the power output end of the machine tool spindle, a flattened straight shank is designed on the shank for connecting to the power output end of the machine tool spindle.

[0014] Compared with the prior art, the technical solution provided by the embodiments of this utility model can achieve at least the following beneficial effects:

[0015] The high-precision composite boring tool of this invention for machining slender, spaced holes can simultaneously machine multiple spaced holes on workpieces with large length-to-diameter ratios, avoiding the problem of large errors in the machined holes caused by tool setting at both ends. This enables high-precision, high-quality, and high-efficiency boring of slender, spaced holes in various diesel engine models. The precision composite boring tool provided by this invention, used for machining slender, spaced holes in diesel engines, not only improves the surface finish of these holes but also reduces the time operators spend setting and aligning roughing and finishing tools, alleviating operator workload and improving machining quality and efficiency.

[0016] This invention relates to a high-precision composite boring tool for machining slender, spaced holes. It enables precision boring of slender, spaced holes in various diesel engine models, reducing machining costs and avoiding the instability and low efficiency caused by the need for end-to-end machining with traditional tools. It also improves the consistency, coaxiality, and surface quality of the machined slender, spaced holes. Verification has shown that this precision composite boring tool avoids the hole diameter machining errors caused by end-to-end machining with traditional tools, ensuring a coaxiality of ≤φ0.03mm for the machined slender, spaced holes, meeting process requirements. Furthermore, this boring tool eliminates the need for repeated changes to roughing and finishing tools, preventing errors caused by manual alignment. This ensures that the diameter error of each hole in the camshaft support bearing hole is ≤0.015mm, meeting machining requirements. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0018] Figure 1 This is a schematic diagram of a high-precision composite boring tool for machining elongated, spaced holes according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a rough boring tool head according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a precision boring tool head according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a boring bar according to an embodiment of the present invention;

[0022] Figure 5 This shows a high-precision boring device for the bearing hole of the camshaft support. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0025] Figure 1 This is a schematic diagram of a high-precision composite boring tool for machining elongated, spaced holes according to an embodiment of the present invention.

[0026] like Figure 1 As shown, the high-precision composite boring tool for machining long and narrow holes includes:

[0027] The boring bar 3 is a long cylindrical shape. The boring bar 3 is provided with multiple rough boring tool head holes 302 and multiple fine boring tool head holes 301. The center line of the rough boring tool head hole 302 is parallel to the center line of the fine boring tool head hole 301.

[0028] The rough boring tool head 2 is set in the rough boring tool head hole 302 and is used for rough boring of the workpiece to be machined;

[0029] The fine boring tool head 1 is installed in the fine boring tool head hole 301 and is used for fine boring after rough boring of the workpiece.

[0030] Among them, a rough boring tool head hole 302 and a fine boring tool head hole 301 form a group. The distance between each rough boring tool head hole 302 is equal to the distance between each fine boring tool head hole 301. The distance between each rough boring tool head hole 302 corresponds to the machining position of the workpiece to be machined.

[0031] According to one or more embodiments of the present invention, the center line of the precision boring tool head hole 301 is at a 50° angle to the center line of the boring tool shank 3.

[0032] According to one or more embodiments of the present invention, the boring bar 3 is provided with 2 to 5 sets of rough boring tool head holes 302 and fine boring tool head holes 301. Further, the boring bar 3 is provided with 3 sets of rough boring tool head holes 302 and fine boring tool head holes 301.

[0033] Figure 2 This is a schematic diagram of a rough boring tool head according to an embodiment of the present invention.

[0034] like Figure 2As shown, the rough boring tool head 2 includes: a rough boring insert 201, a locking screw 202, a rotary adjusting screw 203, and a beveled slider 204. The rough boring insert 201 has a tip radius of R0.4mm. The locking screw 202 fixes the rough boring tool head 2 to the boring bar 3. The beveled slider 204 contacts the rotary adjusting screw 203 and is arranged along the axial direction of the rough boring tool. The beveled slider 204 and the rotary adjusting screw 203 are coaxial. The rough boring insert 201... 01 contacts the top of the inclined plane slider 204; when the adjusting screw 203 is adjusted clockwise, the inclined plane slider 204 moves upward, and the rough boring tool 201 moves radially under the push of the inclined plane slider 204, thereby increasing the diameter of the rough boring tool head 2; when the adjusting screw 203 is adjusted counterclockwise, the inclined plane slider 204 moves downward, and the rough boring tool 201 moves radially under the push of the inclined plane slider 204, thereby decreasing the diameter of the rough boring tool head 2.

[0035] Figure 3 This is a schematic diagram of a precision boring tool head according to an embodiment of the present invention.

[0036] like Figure 3 As shown, the precision boring tool head 1 includes: a precision boring insert 101, a fine-adjustment locking screw 202102, and a fine-adjustment dial 103. The precision boring insert 101 has a tip radius of R0.2mm. The precision boring tool head 1 is fixed to the boring bar 3 using the fine-adjustment locking screw 202102. The diameter of the precision boring insert is mainly adjusted by the bottom fine-adjustment dial 103 to meet the machining requirements of different boring hole diameters. The fine-adjustment dial 103 is located at the bottom of the precision boring tool. The fine-adjustment dial 103 and the precision boring insert 101 are on the same axis. By rotating the fine-adjustment dial 103, the precision boring insert 101 is moved along the axial direction to extend and retract, thereby adjusting the diameter of the precision boring tool head 1.

[0037] Furthermore, when the fine adjustment dial 103 is rotated clockwise, the precision boring insert 101 extends upward along the axis, making the diameter of the precision boring tool head 1 larger; when the fine adjustment dial 103 is rotated counterclockwise, the precision boring insert 101 shortens downward along the axis, making the diameter of the precision boring tool head 1 smaller; after the precision boring tool head 1 is adjusted to the appropriate machining diameter, the fine adjustment locking screw 202102 is rotated clockwise to tighten it, so that the precision boring tool head 1 is fixed on the boring bar 3.

[0038] According to one or more embodiments of this utility model, when the fine boring tool and the rough boring tool are installed on the boring bar 3, there is a certain distance between them. This ensures that during the boring process, only the axial distance of the boring bar 3 needs to be advanced. This allows multiple camshaft support bearing holes to be rough bored and then fine bored simultaneously. This avoids the need for the left and right ends to be aligned when using traditional machining tools, which results in poor coaxiality, unstable quality, and low efficiency of the machined holes. By installing the rough boring tool and the fine boring tool at intervals on the same boring bar 3, the need for manual tool changing and realignment of the tool position is avoided. This prevents a certain deviation between the rough and fine boring tools at the alignment position, which leads to larger form and position tolerances and lower machining efficiency for long-interval holes.

[0039] Figure 4 This is a schematic diagram of a boring bar according to an embodiment of the present invention.

[0040] like Figure 4 As shown, a shank 303 is provided on the boring bar 3 for connecting to the power output end of the machine tool spindle. In order to make the boring bar 3 flexibly connected to the power output end of the machine tool spindle, a flattened straight shank is designed on the shank 303 for connecting to the power output end of the machine tool spindle.

[0041] Figure 5 This shows a high-precision boring device for the bearing hole of the camshaft support.

[0042] like Figure 5 As shown, the high-precision composite boring tool for machining elongated, spaced holes also includes a tool holder support 4. The tool holder support 4 is installed at both ends of the boring bar 3 to prevent chattering during machining, which would affect the surface finish of the elongated, spaced holes. Because the bearing holes of diesel engine camshaft supports have complex structures and large and numerous spacings between the holes being machined, traditional short-length machining tools require end-to-end machining. Therefore, this utility model patent provides a precision composite boring tool for machining elongated, spaced holes in diesel engines. This tool needs to be placed on a high-precision boring device for camshaft support bearing holes to achieve high-precision machining of the camshaft support bearing holes.

[0043] The high-precision composite boring tool of this invention for machining slender, spaced holes can simultaneously machine multiple spaced holes on workpieces with large length-to-diameter ratios, avoiding the problem of large errors in the machined holes caused by tool setting at both ends. This enables high-precision, high-quality, and high-efficiency boring of slender, spaced holes in various diesel engine models. The precision composite boring tool provided by this invention, used for machining slender, spaced holes in diesel engines, not only improves the surface finish of these holes but also reduces the time operators spend setting and aligning roughing and finishing tools, alleviating operator workload and improving machining quality and efficiency.

[0044] This invention relates to a high-precision composite boring tool for machining slender, spaced holes. It enables precision boring of slender, spaced holes in various diesel engine models, reducing machining costs and avoiding the instability and low efficiency caused by the need for end-to-end machining with traditional tools. It also improves the consistency, coaxiality, and surface quality of the machined slender, spaced holes. Verification has shown that this precision composite boring tool avoids the hole diameter machining errors caused by end-to-end machining with traditional tools, ensuring a coaxiality of ≤φ0.03mm for the machined slender, spaced holes, meeting process requirements. Furthermore, this boring tool eliminates the need for repeated changes to roughing and finishing tools, preventing errors caused by manual alignment. This ensures that the diameter error of each hole in the camshaft support bearing hole is ≤0.015mm, meeting machining requirements.

[0045] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A high-precision composite boring tool for machining elongated, spaced holes, characterized in that, include: A boring bar, which is a long cylindrical shape, is provided with multiple rough boring bar head holes and multiple fine boring bar head holes, wherein the center line of the rough boring bar head hole is parallel to the center line of the fine boring bar head hole; A rough boring tool head, wherein the rough boring tool head is disposed in the rough boring tool head hole and is used for rough boring of the workpiece to be machined; A fine boring tool head, wherein the fine boring tool head is disposed in the fine boring tool head hole, and is used for fine boring after rough boring of the workpiece. In this setup, a rough boring tool head hole and a fine boring tool head hole form a group. The distance between each rough boring tool head hole is equal to the distance between each fine boring tool head hole, and the distance between each rough boring tool head hole corresponds to the machining position of the workpiece.

2. The high-precision composite boring tool for machining elongated, spaced holes as described in claim 1, characterized in that, The centerline of the precision boring tool head hole is at a 50° angle to the centerline of the boring tool shank.

3. The high-precision composite boring tool for machining elongated, spaced holes as described in claim 1, characterized in that, The boring bar is provided with 2 to 8 sets of rough boring tool head holes and fine boring tool head holes.

4. The high-precision composite boring tool for machining elongated spaced holes as described in claim 1, characterized in that, The boring bar is equipped with 7 sets of rough boring tool head holes and fine boring tool head holes.

5. The high-precision composite boring tool for machining slender, spaced holes as described in claim 1, characterized in that, Also includes: Tool holder support: Tool holder support is provided at both ends of the boring bar to prevent chattering of the boring bar during machining, which would affect the surface machining quality of the elongated and spaced holes.

6. The high-precision composite boring tool for machining elongated spaced holes as described in claim 1, characterized in that, The rough boring tool head includes: a rough boring insert, a locking screw, a rotating adjusting screw, and a bevel slider. The rough boring insert has a tip radius of R0.4mm. The locking screw secures the rough boring tool head to the boring bar. The bevel slider contacts the rotating adjusting screw and is arranged along the axial direction of the rough boring tool. The bevel slider and the rotating adjusting screw are coaxial, and the rough boring insert contacts the top of the bevel slider. When the rotating adjusting screw is adjusted clockwise, the bevel slider moves upward, and the rough boring insert moves radially under the push of the bevel slider, thus increasing the diameter of the rough boring tool head. When the rotating adjusting screw is adjusted counterclockwise, the bevel slider moves downward, and the rough boring insert moves radially under the push of the bevel slider, thus decreasing the diameter of the rough boring tool head.

7. The high-precision composite boring tool for machining elongated spaced holes as described in claim 1, characterized in that, The precision boring tool head includes: a precision boring insert, a fine-adjustment locking screw, and a fine-adjustment dial. The precision boring insert has a tip radius of R0.2mm. The precision boring tool head is fixed to the boring bar using the fine-adjustment locking screw. The diameter of the precision boring insert is mainly adjusted by the bottom fine-adjustment dial to meet the machining requirements of different boring hole diameters. The fine-adjustment dial is located at the bottom of the precision boring tool, and the fine-adjustment dial and the precision boring insert are on the same axis. By rotating the fine-adjustment dial, the precision boring insert extends and retracts along the axial direction, thereby adjusting the diameter of the precision boring tool head.

8. The high-precision composite boring tool for machining elongated spaced holes as described in claim 7, characterized in that, When the fine-tuning dial is rotated clockwise, the precision boring insert extends upward along the axis, increasing the diameter of the precision boring tool head; when the fine-tuning dial is rotated counterclockwise, the precision boring insert shortens downward along the axis, decreasing the diameter of the precision boring tool head; after the precision boring tool head is adjusted to the appropriate machining diameter, the fine-tuning locking screw is rotated clockwise to tighten it, fixing the precision boring tool head on the boring bar.

9. The high-precision composite boring tool for machining elongated spaced holes as described in claim 1, characterized in that, When the roughing and finishing boring tools are installed on the boring bar, they are spaced a certain distance apart to ensure that during the boring process, only the axial distance of the boring bar needs to be advanced. This allows for simultaneous rough boring and finishing of multiple camshaft support bearing holes, avoiding the need for end-to-end machining of traditional tools, which results in poor coaxiality, unstable quality, and low efficiency of the machined holes. By installing roughing and finishing boring tools at intervals on the same boring bar, the need for manual tool changing and realignment of the tool positions is avoided. This prevents deviations in the alignment of the roughing and finishing boring tools, which leads to larger form and position tolerances and lower machining efficiency for long-interval holes.

10. The high-precision composite boring tool for machining elongated spaced holes as described in claim 1, characterized in that, A shank is provided on the boring bar for connecting to the power output end of the machine tool spindle. To enable flexible connection between the boring bar and the power output end of the machine tool spindle, a flattened straight shank is designed on the shank for connecting to the power output end of the machine tool spindle.

Images