Spiral guide strip composite adjustable fine boring cutter for bicycle front fork part

Abstract

The invention discloses a spiral guide bar composite adjustable fine boring cutter for a bicycle front fork part, which relates to the technical field of machining and comprises a flange cutter handle and a flange boring cutter. The flange boring cutter comprises a flange connecting assembly used for eliminating main shaft jumping, a step C fine boring assembly connected with the outer side of the top of the flange boring cutter, a guide bar assembly connected with the outer side of the bottom of the flange boring cutter, a step A hole fine boring assembly connected with the guide bar assembly and a step B chamfering assembly connected with the flange boring cutter. The flange boring tool has the advantages that the angular jump adjusting screw pushes the angular adjusting lifting pin to orient the flange matching surface so as to realize the angular jump adjustment of the flange boring tool, and the lifting pin anti-falling rubber ring is arranged in the gap of the flange plate to prevent the angular adjusting lifting pin from falling off; the influence of large main shaft jumping caused by a flange connector of the flange boring cutter and the flange cutter handle is facilitated, the stability of the hole diameter and cylindricity is ensured, the spiral guide strip crosses the intermittent wide oil groove in the part hole to support the hole wall, the influence of intermittent cutting cutter relieving and vibration is avoided, and the stability of the hole wall roughness is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a spiral guide bar composite adjustable fine boring tool for a bicycle front fork part. Background Art

[0002] In the field of bicycle manufacturing, the front fork arm is one of the key components, and the processing of deep-hole thin-walled parts in the front fork arm has always been a difficult problem. Traditional machining tools often have problems such as low precision and poor stability when machining such parts. With the continuous improvement of the bicycle industry's requirements for product quality and performance, there is an urgent need for a tool that can efficiently and accurately process deep-hole thin-walled parts of bicycle front forks. This demand has prompted the development of a spiral guide bar composite adjustable fine boring tool, which combines advanced spiral guide bar technology and adjustable functions to better adapt to the processing of parts with different sizes and precision requirements;

[0003] After searching, the applicant found that a Chinese patent disclosed "a deep hole reamer" with the publication (announcement) number "CN113814473A". The patent mainly arranges an arc-shaped protrusion adjacent to the main cutting edge at the bottom of the main cutting tool, and during the fine reaming process, the radial force of the inner wall of the deep hole on the tool is offset by the arc-shaped protrusion, thereby achieving the purpose of reducing the vibration of the tool and increasing the processing accuracy. However;

[0004] The Chinese patent also discloses "a guide bar type composite step boring tool and method for machining camshaft bottom holes", and its publication (announcement) number is "CN106825643B". This patent mainly uses a guide bar type composite step boring tool with guiding, semi-finishing and finishing functions to realize the machining of the three-speed camshaft bottom holes in the middle of the cylinder body with one tool, with high machining accuracy. Compared with the original process scheme, the machining efficiency is improved by about 50%, and the tool cost is reduced. However, in the actual application process, there are multiple teeth cutting, and the cutting resistance causes the deformation of thin-walled parts, resulting in unstable aperture, and at the same time, the cylindricality is unstable and unqualified; the cutting allowance is large, and the multi-tooth multi-step chip removal space is insufficient, causing the chips to scratch the hole wall roughness and unstable and unqualified; the tool cannot be withdrawn quickly and the efficiency is low, and the tool withdrawal needs the same parameters as the feed; the multi-tooth multi-step composite integrated reamer has high processing cost;

[0005] The Chinese patent also discloses "a deep hole processing method", and its publication (announcement) number is "CN102303144A". This patent mainly plays the role of multiple corrections through rough and fine boring processing. 2. The fine-tuning fine boring tool head specially made according to the product characteristics can achieve the best correction effect and can easily adjust the hole diameter. 3. The high-precision outer hole is used as a guide to process deep holes to ensure the concentricity requirements. 4. The guide sleeve also plays a supporting role, which improves the rigidity of the tool during processing and eliminates the rotation caused by the weight of the tool. 5. Due to the increased rigidity, the processing efficiency is greatly improved at the same time. However, in the actual application process, when rotating and cutting, the straight guide bar will jump and vibrate when entering and exiting the oil guide groove, resulting in intermittent cutting scratches; if the guide bar area is increased to cover the oil guide groove, the contact area between the guide bar and the workpiece is too large, the friction generates a lot of heat, the shrinkage rate is large, and the hole deformation size is unstable. However, in actual application, the tool aspect ratio is large, there is no guide bar support, and the tool is easy to let go, resulting in unqualified cylindricity and processing of trumpet-shaped holes;

[0006] Based on the above public patents, the problems of the front fork arm are solved. The specific problems are to reduce the deformation of thin-walled holes to ensure that the hole diameter tolerance is within ±0.015 and the cylindricity is within 0.04; reduce the amount of tool clearance for long overhangs to ensure that the hole diameter and cylindricity are qualified; under the condition of no internal cooling, reasonable chip removal ensures that the hole wall roughness meets Ra0.8 and reduces surface scratches to ensure that the roughness is qualified; eliminate the influence of jumping and vibration of the tool during intermittent cutting of the oil guide groove to ensure that the hole diameter, cylindricity and roughness are qualified; it is not affected by the uneven cutting allowance of 0.1 to 1.2 mm, and the processing is directly in place, and the deformation of the thin-walled hole is not caused during cutting, resulting in unqualified hole diameter and cylindricity; the tool diameter is adjustable; the influence of machine tool spindle runout is eliminated. For this reason, we propose a spiral guide bar composite adjustable fine boring tool for bicycle front fork parts. Summary of the invention

[0007] The purpose of the invention is to provide a spiral guide bar composite adjustable fine boring tool for bicycle front fork parts.

[0008] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a spiral guide bar composite adjustable fine boring tool for a bicycle front fork part, comprising a flange tool holder and a flange boring tool, wherein the flange boring tool comprises a flange connection assembly for eliminating spindle runout, a step C fine boring assembly connected to the outer side of the top of the flange boring tool, a guide bar assembly connected to the outer side of the bottom of the flange boring tool, a step A hole fine boring assembly connected to the guide bar assembly, and a step B chamfering assembly connected to the flange boring tool;

[0009] The flange connection assembly includes a flange connection bolt, a radial runout adjustment screw, an angular runout adjustment screw, an angular adjustment ejector pin, an ejector pin anti-slip rubber ring and a positioning mandrel. A positioning groove matched with the positioning mandrel is provided at the bottom axis of the flange tool handle. The top axis of the flange boring tool is connected to the bottom of the positioning mandrel. The flange end mass ring is fixedly connected at the center of the top outer side of the flange boring tool. A threaded groove matched with the flange connection bolt is provided at the bottom of the flange end mass ring, and the threaded groove extends The flange tool handle extends to the inner wall of the flange tool handle, and positioning holes compatible with the radial run-out adjustment screws are provided on all sides of the flange tool handle. The bottom end of the flange end mass ring is provided with a limiting groove compatible with the angular run-out adjustment screw. The top surface of the angular run-out adjustment screw is in contact with the angular adjustment ejector pin, and the top surface of the angular adjustment ejector pin is in contact with the bottom surface of the flange tool handle. The outer side of the angular adjustment ejector pin is provided with an anti-slip groove compatible with the ejector pin anti-slip rubber ring, and the angular adjustment ejector pin is slidably connected to the inner wall of the flange end mass ring.

[0010] As a further solution of the present invention: arc grooves matching with the radial runout adjustment screws are formed around the positioning mandrel.

[0011] As a further solution of the present invention: the step C fine boring assembly includes a step C fine boring tool clamp, a tool clamp locking screw, a diamond finishing fine boring blade, a blade locking screw, a radial adjustment screw and an axial adjustment screw, the front of the flange boring tool is provided with a groove matched with the step C fine boring tool clamp, the inner wall of the step C fine boring tool clamp is provided with a locking hole matched with the tool clamp locking screw, and the locking hole extends to the inner wall of the flange boring tool, the side of the step C fine boring tool clamp is provided with a finishing groove matched with the diamond finishing fine boring blade, the inner wall of the diamond finishing fine boring tool is provided with a screw hole matched with the blade locking screw, the back of the step C fine boring tool clamp is provided with a radial groove matched with the radial adjustment screw, and the top surface of the step C fine boring tool clamp is provided with an axial groove matched with the axial adjustment screw.

[0012] As a further solution of the present invention: the front end of the diamond finishing and fine boring blade extends to the outside of the step C finishing boring tool holder, and the rear end of the radial adjustment screw contacts the inner wall of the finishing groove.

[0013] As a further solution of the present invention: the guide bar assembly includes a guide bar A and a back guide bar, the bottom outer side of the flange boring tool is provided with a connecting groove compatible with the guide bar A, and the number of guide bar A is five groups, the five groups of guide bar A are vacuum welded to the bottom outer side of the flange boring tool at a helix angle of 30°, and the outer side of the back guide bar can be detachably installed on the front side of the flange boring tool.

[0014] As a further solution of the present invention: the number of the step A hole precision boring assemblies is two groups, and the two groups of the step A hole precision boring assemblies are respectively installed on the bottom front of the flange boring tool and the front of the middle position of the flange boring tool, the step A hole precision boring assembly includes a pressure block, a diamond blade, a wedge pin, a limiting adjustment screw and a double-head locking screw, the front of the flange boring tool is provided with two pressure grooves adapted to the pressure block, the inner wall of the flange boring tool and the inner wall of the pressure block are both provided with threaded holes adapted to the double-head locking screws, the front of the pressure block is slidably connected to the back of the diamond blade, the front of the wedge pin is provided with an inclined surface, and the inclined surface of the wedge pin is slidably connected to the top surface of the diamond blade, and the other end of the wedge pin is in contact with the limiting adjustment screw.

[0015] As a further solution of the present invention: an axial groove is provided on the front side of the flange boring tool, and a blade positioning pin is detachably mounted on the inner wall of the axial groove.

[0016] As a further solution of the present invention: the step B chamfering assembly is divided into two groups, and the step B chamfering assembly includes a chamfering blade and a positioning screw. The back of the flange boring tool is provided with a screw hole adapted to the positioning screw, and the screw hole passes through the chamfering blade.

[0017] As a further solution of the present invention: a guide groove is provided on the front of the flange boring tool, and the guide groove is provided on both sides of the five groups of guide bars A, and a distal mass ring is fixedly connected to the bottom of the flange boring tool.

[0018] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The present invention ensures that the runout value of the distal mass ring is controlled within 0.003 by evenly distributing the flange connection bolts on the angular runout adjustment screws on the flange end mass ring of the flange boring tool. The angular runout adjustment screws push the angular adjustment ejector pin to the directional flange mating surface, thereby realizing the angular runout adjustment of the flange boring tool. The ejector pin anti-drop rubber ring is installed between the flange gap to prevent the angular adjustment ejector pin from falling off, which is convenient for the flange boring tool and the flange handle flange interface to reduce the influence of the large spindle runout, thereby ensuring the stability of the aperture and cylindricity.

[0020] 2. The present invention uses a spiral alloy guide bar 30° (not limited to 30°) to segmentally surround the flange boring tool through the step A hole fine boring assembly, uses the guide bar A and the guide structure of the guide bar A, and adds the step B chamfering assembly to ensure the stability of the cylindricity (required to be within 0.04, actual 0.025) and roughness (required to be Ra0.8, actual Ra0.5) of the fork tube hole of the bicycle front fork arm. The support surface of the guide bar A is finely ground to control the roughness within Ra0.1, thereby reducing friction and achieving the effect of eliminating the influence of the tool letting-down caused by the long overhang ratio;

[0021] 3. The present invention adopts an adjustable back-taper and diameter-adjustable locking adjustment system through the step A hole fine boring assembly, and the adjustable accuracy reaches 0.001mm in diameter, which ensures the stability of the hole diameter. The back-taper adjustment of the blade ensures the stability of the cylindricity, achieving the effect of rapid tool withdrawal and improved efficiency;

[0022] 4. The present invention can further provide a series of spirally distributed central water outlet holes near the guide bar through the hollow structure of the flange boring tool and the oil guide groove to further adapt to the working conditions of machine tools with central water outlet function, thereby enhancing the lubrication and cooling functions;

[0023] 5. The present invention adopts a slot-type boring chip groove through the step A hole fine boring assembly and the step C fine boring assembly. The three steps are open and connected, and the support guide bar unit structure is disconnected. The chip groove space is large so as to facilitate the removal of a large number of boring chips of the three steps. The chip groove of the step B chamfering assembly adopts a closed chip groove. The reason is that the chamfering cutting has less chips. More importantly, it avoids using an open chip groove to disconnect the spiral guide bar unit again, so that the guide bar unit completely surrounds the support fork tube hole wall and crosses the oil guide groove to reduce the jumping effect of intermittent cutting.

[0024] 6. The present invention adjusts the limiting adjustment screw, and then limits the adjustment screw to push the wedge pin to move, and utilizes the diamond blade to be limited by the cooperation between the pressed block and the diamond blade, and then the diamond blade moves along the inclined surface of the wedge pin, so as to form an adjustable locking adjustment system, and the step C fine boring assembly and the step B chamfering assembly are both provided with corresponding locking adjustment systems, thereby achieving the effect of facilitating the adjustment of the tool diameter;

[0025] 7. The present invention reduces the risk of chips from the step B chamfering assembly falling into the step A hole fine boring assembly through a closed structure, that is, reduces the problem of the chamfering chips being squeezed and scratched by the guide bar to cause poor roughness and unstable aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a first overall schematic diagram of an embodiment of the present invention;

[0027] Figure 2 is a second overall schematic diagram of an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of an overall explosion in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the connection relationship of the flange boring tool in the embodiment of the present invention;

[0030] Figure 5 Schematic diagram of a precision boring assembly for a step A hole in an embodiment of the present invention;

[0031] Figure 6Schematic diagram of a flange boring tool in an embodiment of the present invention;

[0032] Figure 7 Schematic diagram of a step C fine boring assembly in an embodiment of the present invention;

[0033] Figure 8 It is a partial schematic diagram of a flange boring cutter in an embodiment of the present invention.

[0034] In the figure: 1. Flange tool holder; 2. Flange boring tool; 3. Flange connection assembly; 31. Flange connection bolt; 32. Radial runout adjustment screw; 33. Angular runout adjustment screw; 34. Adjustment pin; 35. Rubber ring for anti-dropping of the pin; 36. Positioning mandrel; 4. Step C fine boring assembly; 41. Step C fine boring tool holder; 42. Tool holder locking screw; 43. Diamond finishing boring tool; 44. Blade locking screw; 45. Radial adjustment screw nail; 46, axial adjustment screw; 5, guide bar assembly; 51, guide bar A; 52, back guide bar; 53, guide groove; 61, distal mass ring; 62, flange end mass ring; 7, step A hole fine boring assembly; 71, pressure block; 72, diamond blade; 73, wedge pin; 74, limit adjustment screw; 75, blade positioning pin; 76, double-head locking screw; 8, step B chamfering assembly; 81, chamfering blade; 82, positioning screw. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] A spiral guide bar composite adjustable fine boring tool for bicycle front fork parts. In the field of bicycle manufacturing, the front fork arm is one of the key components, and the processing of deep hole thin-walled parts in the front fork arm has always been a difficult problem. Traditional processing tools often have problems such as low precision and poor stability when processing such parts. With the continuous improvement of the bicycle industry's requirements for product quality and performance, there is an urgent need for a tool that can efficiently and accurately process deep hole thin-walled parts of bicycle front fork arms. This demand has prompted the development of a spiral guide bar composite adjustable fine boring tool, which combines advanced spiral guide bar technology and adjustable functions to better adapt to the processing of parts with different sizes and precision requirements;

[0038] After searching, the applicant found that a Chinese patent disclosed "a deep hole reamer" with the publication (announcement) number "CN113814473A". The patent mainly arranges an arc-shaped protrusion adjacent to the main cutting edge at the bottom of the main cutting tool, and during the fine reaming process, the radial force of the inner wall of the deep hole on the tool is offset by the arc-shaped protrusion, thereby achieving the purpose of reducing the vibration of the tool and increasing the processing accuracy. However;

[0039] The Chinese patent also discloses "a guide bar type composite step boring tool and method for machining camshaft bottom holes", and its publication (announcement) number is "CN106825643B". This patent mainly uses a guide bar type composite step boring tool with guiding, semi-finishing and finishing functions to realize the machining of the three-speed camshaft bottom holes in the middle of the cylinder body with one tool, with high machining accuracy. Compared with the original process scheme, the machining efficiency is improved by about 50%, and the tool cost is reduced. However, in the actual application process, there are multiple teeth cutting, and the cutting resistance causes the deformation of thin-walled parts, resulting in unstable aperture, and at the same time, the cylindricality is unstable and unqualified; the cutting allowance is large, and the multi-tooth multi-step chip removal space is insufficient, causing the chips to scratch the hole wall roughness and unstable and unqualified; the tool cannot be withdrawn quickly and the efficiency is low, and the tool withdrawal needs the same parameters as the feed; the multi-tooth multi-step composite integrated reamer has high processing cost;

[0040] The Chinese patent also discloses "a deep hole processing method", and its publication (announcement) number is "CN102303144A". This patent mainly plays the role of multiple corrections through rough and fine boring processing. 2. The fine-tuning fine boring tool head specially made according to the product characteristics can achieve the best correction effect and can easily adjust the hole diameter. 3. The high-precision outer hole is used as a guide to process deep holes to ensure the concentricity requirements. 4. The guide sleeve also plays a supporting role, which improves the rigidity of the tool during processing and eliminates the rotation caused by the weight of the tool. 5. Due to the increased rigidity, the processing efficiency is greatly improved at the same time. However, in the actual application process, when rotating and cutting, the straight guide bar will jump and vibrate when entering and exiting the oil guide groove, resulting in intermittent cutting scratches; if the guide bar area is increased to cover the oil guide groove, the contact area between the guide bar and the workpiece is too large, the friction generates a lot of heat, the shrinkage rate is large, and the hole deformation size is unstable. However, in actual application, the tool aspect ratio is large, there is no guide bar support, and the tool is easy to let go, resulting in unqualified cylindricity and processing of trumpet-shaped holes;

[0041] Based on the above public patent, it is proposed to solve the problems of the front fork arm. The specific problems to be solved are to reduce the deformation of thin-walled holes to ensure that the hole diameter tolerance is within ±0.015 and the cylindricity is within 0.04; reduce the amount of tool clearance for long overhangs to ensure that the hole diameter and cylindricity are qualified; under the condition of no internal cooling, reasonable chip removal ensures that the hole wall roughness meets Ra0.8 and reduces surface scratches to ensure that the roughness is qualified; eliminate the influence of jumping and vibration of the tool during intermittent cutting of the oil guide groove to ensure that the hole diameter, cylindricity and roughness are qualified; not affected by the uneven cutting allowance of 0.1mm to 1.2mm, directly process in place, and do not cause deformation of thin-walled holes during cutting, resulting in unqualified hole diameter and cylindricity; the tool diameter is adjustable; and the influence of machine tool spindle runout is eliminated.

[0042] Please see attached Figure 1 -Attached Figure 8 The present invention discloses a spiral guide bar composite adjustable fine boring tool for a bicycle front fork part, comprising a flange tool holder 1 and a flange boring tool 2, wherein the flange boring tool 2 comprises a flange connection assembly 3 for eliminating spindle runout, a step C fine boring assembly 4 connected to the outer side of the top of the flange boring tool 2, a guide bar assembly 5 connected to the outer side of the bottom of the flange boring tool 2, a step A hole fine boring assembly 7 connected to the guide bar assembly 5, and a step B chamfering assembly 8 connected to the flange boring tool 2;

[0043] The flange connection assembly 3 includes a flange connection bolt 31, a radial runout adjustment screw 32, an angular runout adjustment screw 33, an angular adjustment ejector pin 34, an ejector pin anti-slip rubber ring 35 and a positioning mandrel 36. A positioning groove adapted to the positioning mandrel 36 is provided at the bottom axis of the flange tool holder 1. The top axis of the flange boring tool 2 is connected to the bottom of the positioning mandrel 36. A flange end mass ring 62 is fixedly connected to the center of the top outer side of the flange boring tool 2. A threaded groove adapted to the flange connection bolt 31 is provided at the bottom of the flange end mass ring 62, and the threaded groove extends from the bottom of the flange tool holder 1 to the bottom of the flange tool holder 1. Extending to the inner wall of the flange tool handle 1, the flange tool handle 1 is provided with positioning holes adapted to the radial runout adjustment screw 32 on all sides, the bottom end of the flange end mass ring 62 is provided with a limiting groove adapted to the angular runout adjustment screw 33, the top surface of the angular runout adjustment screw 33 is in contact with the angular adjustment ejector pin 34, and the top surface of the angular adjustment ejector pin 34 is in contact with the bottom surface of the flange tool handle 1 on all sides, the outer side of the angular adjustment ejector pin 34 is provided with an anti-slip groove adapted to the ejector pin anti-slip rubber ring 35, and the angular adjustment ejector pin 34 is slidably connected to the inner wall of the flange end mass ring 62;

[0044] The positioning mandrel 36 is provided with arc grooves around its periphery to match the radial runout adjustment screw 32 .

[0045] Specific working process: by inserting the positioning mandrel 36 into the inside of the positioning groove, the flange tool holder 1 and the flange boring tool 2 are preliminarily aligned, and then the flange end quality ring 62 and the flange tool holder 1 are fixed by the flange connecting bolts 31, and the flange connecting bolts 31 are arranged in a circular array with the flange boring tool 2 as the center, and the angle between the four flange connecting bolts 31 is 90°. By adjusting the angular runout adjustment screw 33, the angular adjustment ejector pin 34 and the ejector pin anti-slip rubber ring 35 are pushed upward, thereby making the flange connection performance between the flange tool holder 1 and the flange boring tool 2 more stable.

[0046] Furthermore, by evenly distributing the flange connecting bolts 31 on the angular run-out adjustment screws 33 on the flange end mass ring 62 of the flange boring tool 2, it is ensured that the run-out value of the distal mass ring 61 is controlled within 0.003, and the angular run-out adjustment screws 33 push the angular adjustment ejector pin 34 to orient the flange mating surface, thereby realizing the angular run-out adjustment of the flange boring tool 2, and by installing the ejector pin anti-slip rubber ring 35 between the flange gap to prevent the angular adjustment ejector pin 34 from falling off, it is convenient to reduce the influence of large spindle run-out caused by the flange interface between the flange boring tool 2 and the flange tool holder 1, thereby ensuring the stability of the aperture and cylindricity.

[0047] Embodiment 2:

[0048] Based on the first embodiment, please refer to the attached Figure 1 -Attached Figure 8 As shown, the step C fine boring assembly 4 includes a step C fine boring tool holder 41, a tool holder locking screw 42, a diamond finishing fine boring blade 43, a blade locking screw 44, a radial adjustment screw 45 and an axial adjustment screw 46. The front of the flange boring tool 2 is provided with a groove adapted to the step C fine boring tool holder 41, and the inner wall of the step C fine boring tool holder 41 is provided with a locking hole adapted to the tool holder locking screw 42, and the locking hole extends to the flange. The inner wall of the blue boring tool 2 and the side of the step C fine boring tool holder 41 are provided with a finishing groove adapted to the diamond finishing boring blade 43, the inner wall of the diamond finishing boring tool 43 is provided with a screw hole adapted to the blade locking screw 44, the back of the step C fine boring tool holder 41 is provided with a radial groove adapted to the radial adjustment screw 45, and the top surface of the step C fine boring tool holder 41 is provided with an axial groove adapted to the axial adjustment screw 46;

[0049] The front end of the diamond finishing and fine boring blade 43 extends to the outside of the step C finishing and fine boring tool holder 41, and the rear end of the radial adjustment screw 45 contacts the inner wall of the finishing groove.

[0050] Specific work flow: the step A hole fine boring component 7, the step B chamfering component 8 and the step C fine boring component 4 are installed on the flange boring tool 2 from bottom to top, and the component radius increases from bottom to top.

[0051] Furthermore, through the step A hole fine boring component 7 and the step C fine boring component 4, a groove-type boring chip groove is adopted, which is an open three-step through-hole structure to disconnect the support guide bar unit structure. The chip groove space is large to facilitate the removal of a large amount of boring chips from the three steps. The chip groove of the step B chamfering component 8 adopts a closed chip groove. The reason is that the chamfering cutting produces less chips, and more importantly, it avoids using an open chip groove to disconnect the spiral guide bar unit again, so that the guide bar unit completely surrounds the support fork tube hole wall and crosses the oil guide groove to reduce the jumping effect of intermittent cutting.

[0052] Embodiment three:

[0053] Based on the second embodiment, please refer to the attached Figure 1 -Attached Figure 8 As shown, the guide bar assembly 5 includes a guide bar A51 and a back guide bar 52. A connecting groove adapted to the guide bar A51 is provided on the outer side of the bottom of the flange boring tool 2. The number of guide bars A51 is five groups. The five groups of guide bars A51 are vacuum welded to the outer side of the bottom of the flange boring tool 2 at a helical angle of 30°. The outer side of the back guide bar 52 can be detachably mounted on the front side of the flange boring tool 2.

[0054] The step B chamfering assembly 8 is divided into two groups. The step B chamfering assembly 8 includes a chamfering blade 81 and a positioning screw 82 . A screw hole matching the positioning screw 82 is provided on the back of the flange boring tool 2 , and the screw hole passes through the chamfering blade 81 .

[0055] Specific work flow: All guide bars A51 and back guide bars 52 are made of cemented carbide material with a hardness of HRA93 (HV1750) or above to ensure the wear resistance of guide bars A51 and back guide bars 52. Flange boring cutter 2 is made of tool steel and heat treated to HRC50. The guide bar assembly 5 and the flange boring cutter are vacuum welded. This welding method effectively avoids uneven heating caused by the influence of the external environment during welding, effectively prevents the generation of bubbles during welding, damage to the guide bar alloy material and loose welding, and improves the welding reliability and stress deformation of the guide bar assembly 5 and the flange boring cutter 2.

[0056] Furthermore, through the step A hole fine boring assembly 7, a spiral alloy guide bar is used to segmentally wrap around the flange boring cutter 2 at 30° (not limited to 30°), and by utilizing the guide bar A51 and the guiding structure of the guide bar A51, and by adding the step B chamfering assembly 8, the stability of the cylindricity (required to be within 0.04, actual 0.025) and roughness (required to be Ra0.8, actual Ra0.5) of the fork tube hole of the front fork arm of the bicycle is ensured. The support surface of the guide bar A51 is finely ground to control the roughness to within Ra0.1, thereby reducing friction and achieving the effect of eliminating the influence of the tool letting go due to the long overhang ratio.

[0057] Embodiment 4:

[0058] Based on the third embodiment, please refer to the attached Figure 1 -Attached Figure 8 As shown, there are two groups of step A hole fine boring assemblies 7, which are respectively installed on the bottom front of the flange boring tool 2 and the front of the middle position of the flange boring tool 2. The step A hole fine boring assembly 7 includes a pressure block 71, a diamond blade 72, a wedge pin 73, a limiting adjustment screw 74 and a double-head locking screw 76. The front of the flange boring tool 2 is provided with two pressure grooves adapted to the pressure block 71, and the inner wall of the flange boring tool 2 and the inner wall of the pressure block 71 are both provided with threaded holes adapted to the double-head locking screw 76. The front of the pressure block 71 is slidably connected to the back of the diamond blade 72, the front of the wedge pin 73 is provided with an inclined surface, and the inclined surface of the wedge pin 73 is slidably connected to the top surface of the diamond blade 72, and the other end of the wedge pin 73 is in contact with the limiting adjustment screw 74.

[0059] An axial groove is provided on the front side of the flange boring tool 2, and a blade positioning pin 75 is detachably mounted on the inner wall of the axial groove.

[0060] Specific working process: by adjusting the limiting adjustment screw 74, the limiting adjustment screw 74 pushes the wedge pin 73 to move, and the diamond blade 72 is limited by the cooperation between the pressing block 71 and the diamond blade 72, and then the diamond blade 72 moves along the inclined surface of the wedge pin 73, so that an adjustable locking adjustment system is formed.

[0061] Furthermore, the step A hole fine boring assembly 7 adopts an adjustable back cone and a diameter-adjustable locking adjustment system with an adjustable accuracy of 0.001 mm in diameter, ensuring the stability of the aperture. The back cone adjustment of the blade ensures the stability of the cylindricity, achieving the effect of rapid tool retraction and improved efficiency.

[0062] Embodiment five:

[0063] Based on the fourth embodiment, please refer to the attached Figure 1 -Attached Figure 8 As shown, a guide groove 53 is provided on the front of the flange boring tool 2 , and the guide groove 53 is provided on both sides of the five groups of guide strips A51 , and a distal mass ring 61 is fixedly connected to the bottom of the flange boring tool 2 .

[0064] Specific working process: a guide groove 53 is set between the flange boring tool 2 and the guide bar A51 to guide the cutting fluid into the guide groove 53, and a cutting fluid emulsion oil film is formed between the lubricating guide bar support surface and the fork tube hole wall, thereby lubricating and cooling the guide bar support surface and the fork tube hole wall, reducing the friction force and the aperture change of the thin-walled parts caused by thermal expansion and contraction due to frictional heat.

[0065] Furthermore, a series of spirally distributed central water outlet holes may be added near the guide strip in the hollow structure and oil guide groove of the flange boring tool 2 to further adapt to the working conditions of machine tools with central water outlet function, thereby enhancing the lubrication and cooling functions.

[0066] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0068] It should be noted that the device structure and the drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above invention, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field.

[0069] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0070] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations are made to these embodiments without departing from the principle and spirit of the present invention, and they still fall within the protection scope of the present invention.

Claims

1. A spiral guide bar composite adjustable fine boring tool for bicycle front fork parts, characterized in that: The invention comprises a flange tool holder (1) and a flange boring tool (2), wherein the flange boring tool (2) comprises a flange connection assembly (3) for eliminating spindle runout, a step C fine boring assembly (4) connected to the outer side of the top of the flange boring tool (2), a guide bar assembly (5) connected to the outer side of the bottom of the flange boring tool (2), a step A hole fine boring assembly (7) connected to the guide bar assembly (5), and a step B chamfering assembly (8) connected to the flange boring tool (2); The flange connection assembly (3) comprises a flange connection bolt (31), a radial runout adjustment screw (32), an angular runout adjustment screw (33), an angular adjustment ejector pin (34), an ejector pin anti-slip rubber ring (35) and a positioning mandrel (36); a positioning groove matched with the positioning mandrel (36) is provided at the bottom axis of the flange tool holder (1); the top axis of the flange boring tool (2) is connected to the bottom of the positioning mandrel (36); a flange end mass ring (62) is fixedly connected at the outer center of the top of the flange boring tool (2); a threaded groove matched with the flange connection bolt (31) is provided at the bottom of the flange end mass ring (62); and the threaded groove is provided at the bottom of the flange end mass ring (62). The groove extends to the inner wall of the flange tool handle (1), and the flange tool handle (1) is provided with positioning holes adapted to the radial runout adjustment screw (32) on all sides, and the bottom end of the flange end mass ring (62) is provided with a limiting groove adapted to the angular runout adjustment screw (33), and the top surface of the angular runout adjustment screw (33) is in contact with the angular adjustment ejector pin (34), and the top surface of the angular adjustment ejector pin (34) is in contact with the bottom surface of the flange tool handle (1) on all sides, and the outer side of the angular adjustment ejector pin (34) is provided with an anti-slip groove adapted to the ejector pin anti-slip rubber ring (35), and the angular adjustment ejector pin (34) is slidably connected to the inner wall of the flange end mass ring (62).

2. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 1, characterized in that: The positioning core shaft (36) is provided with arc grooves around its periphery which are matched with the radial runout adjustment screw (32).

3. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 1, characterized in that: The step C fine boring assembly (4) comprises a step C fine boring tool holder (41), a tool holder locking screw (42), a diamond finishing fine boring blade (43), a blade locking screw (44), a radial adjustment screw (45) and an axial adjustment screw (46); the front surface of the flange boring tool (2) is provided with a groove matched with the step C fine boring tool holder (41); the inner wall of the step C fine boring tool holder (41) is provided with a locking hole matched with the tool holder locking screw (42), and the locking hole extends to the flange. The inner wall of the blue boring tool (2), the side surface of the step C fine boring tool holder (41) is provided with a finishing groove matched with a diamond finishing boring blade (43), the inner wall of the diamond finishing boring tool (43) is provided with a screw hole matched with a blade locking screw (44), the back surface of the step C fine boring tool holder (41) is provided with a radial groove matched with a radial adjustment screw (45), and the top surface of the step C fine boring tool holder (41) is provided with an axial groove matched with an axial adjustment screw (46).

4. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 3, characterized in that: The front end of the diamond finishing and fine boring blade (43) extends to the outside of the step C finishing boring tool holder (41), and the rear end of the radial adjustment screw (45) contacts the inner wall of the finishing groove.

5. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 1, characterized in that: The guide bar assembly (5) comprises a guide bar A (51) and a back guide bar (52); a connection groove matched with the guide bar A (51) is provided on the outer side of the bottom of the flange boring tool (2); and the number of the guide bars A (51) is five groups; the five groups of guide bars A (51) are vacuum welded to the outer side of the bottom of the flange boring tool (2) at a helical angle of 30°; and the outer side of the back guide bar (52) can be detachably mounted on the front side of the flange boring tool (2).

6. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 1, characterized in that: The number of the step A hole fine boring assemblies (7) is two groups. The two groups of the step A hole fine boring assemblies (7) are respectively installed on the bottom front of the flange boring tool (2) and the front of the middle position of the flange boring tool (2). The step A hole fine boring assemblies (7) include a pressing block (71), a diamond blade (72), a wedge pin (73), a limiting adjustment screw (74) and a double-headed locking screw (76). The front of the flange boring tool (2) is provided with two holes which are connected to the pressing block (71). The inner wall of the flange boring tool (2) and the inner wall of the pressure block (71) are both provided with threaded holes that are compatible with the double-head locking screw (76), the front side of the pressure block (71) is slidably connected to the back side of the diamond blade (72), the front side of the wedge pin (73) is provided with an inclined surface, and the inclined surface of the wedge pin (73) is slidably connected to the top surface of the diamond blade (72), and the other end of the wedge pin (73) is in contact with the limiting adjustment screw (74).

7. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 6, characterized in that: The front side of the flange boring tool (2) is provided with an axial groove, and a blade positioning pin (75) is detachably mounted on the inner wall of the axial groove.

8. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 1, characterized in that: The step B chamfering assembly (8) is divided into two groups, and the step B chamfering assembly (8) comprises a chamfering blade (81) and a positioning screw (82). The back of the flange boring tool (2) is provided with a screw hole matched with the positioning screw (82), and the screw hole passes through the chamfering blade (81).

9. The spiral guide composite adjustable fine boring tool for bicycle front fork parts according to claim 5, characterized in that: A guide groove (53) is provided on the front of the flange boring tool (2), and the guide groove (53) is provided on both sides of the five groups of guide bars A (51). A distal mass ring (61) is fixedly connected to the bottom of the flange boring tool (2).

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