Honing Tool and Machine Tool for Finish Machining of Tapered Hole

Abstract

The present invention relates to a honing tool and a machine tool for finish machining of tapered holes. The honing tool includes a floating tool shank assembly, the floating tool shank assembly has a tool shank, the honing tool further includes an ultrasonic power supply, a wireless transmitter electrically connected to the ultrasonic power supply and capable of emitting a magnetic signal, and a transducer disposed on the tool shank. The transducer can receive the magnetic signal of the wireless transmitter and convert it into mechanical vibration. The honing tool of the present invention combines ultrasonic vibration through a floating tool shank assembly and is used for finish machining of tapered holes. It not only has good perpendicularity, but also has a small machining allowance at the sharp corner of the tapered hole. It can meet the precision requirements of the tapered hole without manual grinding, greatly improving the machining efficiency, and the surface of the machined tapered hole has better finish than that of manual grinding.

Description

Technical Field

[0001] The present invention specifically relates to a honing tool and a machine tool for fine machining of tapered holes. Background Art

[0002] For the machining of tapered holes, the traditional method is to first perform rough reaming and then fine reaming. However, during the fine reaming process of tapered holes, problems such as poor perpendicularity and large machining allowances remaining at the sharp corners often occur. The current method uses manual grinding, which has low production efficiency. Moreover, for the case where multiple tapered holes need to be machined on a single part, the manual grinding method usually has human errors, making it difficult to ensure the dimensional consistency of each tapered hole, and the manual grinding method is also time-consuming and laborious.

[0003] Chinese Patent CN213945150U discloses a floating tool holder, which includes a machine tool connection handle. The bottom end of the machine tool connection handle is fixedly connected with an outer floating seat. The bottom center of the outer floating seat is fixedly connected with an inner floating body. The bottom of the outer floating seat is also provided with a tool connection sleeve. The top of the tool connection sleeve is provided with an installation groove, and a ball slide sleeve is fixedly arranged on the inner wall of the installation groove. Through the sliding action of the connecting pin in the ball slide sleeve, the tool connection sleeve can move both left and right and back and forth, so as to conveniently adjust the axis of the tool to be on the same axis as the axis of the part after clamping, enabling the tool to automatically align with the part to achieve automatic alignment. When this floating tool holder is used for the machining of tapered holes, it can solve the problem of poor perpendicularity to a certain extent, but there is still a large machining allowance remaining at the sharp corners after fine reaming, and manual grinding is still required, which is time-consuming and laborious, and there are human errors when machining multiple holes. Summary of the Invention

[0004] The present invention provides an improved honing tool for fine machining of tapered holes to solve the problems of poor perpendicularity and large machining allowances during the fine machining of tapered holes. When using this honing tool to machine tapered holes, manual grinding is no longer required to meet the machining requirements of tapered holes, which greatly improves the machining efficiency and can effectively ensure the dimensional consistency of the machining of multiple tapered holes.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A honing tool for fine machining of tapered holes includes a floating tool holder assembly. The floating tool holder assembly has a tool holder. The honing tool further includes an ultrasonic power supply, a wireless transmitter electrically connected to the ultrasonic power supply and capable of emitting a magnetic signal, and a transducer arranged on the tool holder. The transducer can receive the magnetic signal of the wireless transmitter and convert it into mechanical vibration.

[0007] In some embodiments, when the honing tool is working, the emitting end face of the wireless transmitter faces the transducer.

[0008] In some specific embodiments, the emitting end face of the wireless transmitter is an arc surface. When the honing tool is working, the distance between the arc surface and the transducer is 0.4 - 0.9 mm.

[0009] In some embodiments, the floating tool holder assembly further includes a hollow shaft connection assembly and a cam assembly disposed within the shaft connection assembly. One end of the tool holder is inserted into the shaft connection assembly and connected to one end of the cam assembly. The cam assembly and the shaft connection assembly are connected by a pin disposed movably. When the shaft connection assembly rotates, the cam assembly is driven to rotate through the transmission of the pin, and then the tool holder is driven to rotate;

[0010] There is a gap between the outer side wall of the cam assembly and the inner side wall of the shaft connection assembly, so that the cam assembly can float in the radial direction of the honing tool within the shaft connection assembly.

[0011] In some specific embodiments, the cam assembly includes a cam disposed within the shaft connection assembly. The floating tool holder assembly further includes a top plate movably disposed between one end of the cam and the shaft connection assembly. A first ball is disposed between the one end of the cam and the top plate;

[0012] The other end of the cam is connected to the tool holder;

[0013] The floating tool holder assembly further includes a first bottom plate and a second bottom plate sequentially disposed between the other end of the cam and the shaft connection assembly, a plurality of second balls disposed between the first bottom plate and the second bottom plate, and a ball slide plate disposed between the first bottom plate and the second bottom plate for mounting the plurality of second balls;

[0014] The first bottom plate is located between the cam and the second balls, the second bottom plate is located between the second balls and the shaft connection assembly, and an elastic member is disposed between the first bottom plate and the cam. The elastic member extends along the axial direction of the honing tool;

[0015] The first bottom plate, the second bottom plate, and the ball slide plate are respectively sleeved on the tool holder, and there are gaps between the first bottom plate, the second bottom plate and the tool holder respectively, and there is a gap between the ball slide plate and the inner side wall of the shaft connection assembly.

[0016] In some specific embodiments, the floating tool holder assembly further includes an adjustment assembly for adjusting the floating amount of the cam assembly. The adjustment assembly includes an adjustment screw threadedly connected to the shaft connection assembly and having one end abutted against the top plate.

[0017] In some specific embodiments, the shaft connection assembly includes a shaft connector and a sleeve connected to the shaft connector. The top plate is disposed between the cam and the shaft connector. The adjusting screw is threadedly connected to the shaft connector. The second bottom plate is disposed between the second ball and the sleeve.

[0018] In some specific embodiments, the floating amount is 0.5 - 1.5 mm; and / or,

[0019] On opposite sides of the side wall of the shaft connection assembly, annular through grooves are provided, and the through grooves extend along the axial direction of the honing tool.

[0020] On opposite sides of the cam assembly, annular grooves are provided corresponding to the positions of the through grooves, and the grooves extend along the axial direction of the honing tool.

[0021] Pin shafts are movably inserted into the through grooves and the grooves on both sides. A spacer sleeve for limiting the pin shafts within the through grooves and the grooves is inserted into the through grooves on both sides.

[0022] The pin shafts have a movement clearance of 5 - 7 mm in the axial direction of the honing tool within the through grooves.

[0023] The floating tool holder assembly further includes an elastic fixing ring sleeved outside the spacer sleeves on both sides; and / or,

[0024] The floating tool holder assembly further includes a nut connected to the shaft connection assembly, and the nut is used to connect to the main shaft of the machine tool.

[0025] In some embodiments, the honing tool further includes a reamer rod that can be detachably connected to the tool holder.

[0026] The second technical solution adopted by the present invention is: a machine tool, including a honing tool, and the honing tool is the honing tool described above.

[0027] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0028] The honing tool of the present invention combines ultrasonic vibration through a floating tool holder assembly for the finish machining of tapered holes. It not only has good perpendicularity, but also has a small machining allowance at the sharp corners of the tapered holes. It can meet the precision requirements of the tapered holes without manual grinding, greatly improving the machining efficiency, and the surface of the machined tapered holes has better finish than that of manual grinding.

[0029] When the honing tool of the present invention faces the situation of machining multiple identical tapered holes on a component, it can effectively ensure the consistency of the sizes of multiple tapered holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Full-sectional structural schematic diagram of a honing tool for fine machining of tapered holes according to a representative embodiment of the present invention;

[0031] Figure 2 is Figure 1 Enlarged structural schematic diagram at position A in

[0032] Figure 3 is Figure 1 Side-view structural schematic diagram of the shaft connector in the honing tool of

[0033] Figure 4 is Figure 1 Side-view structural schematic diagram of the cam in the honing tool of

[0034] Figure 5 is Figure 1 Front-view structural schematic diagram of the wireless transmitter mounted on the bracket in the honing tool in

[0035] Figure 6 is Figure 1 Top-view structural schematic diagram of the wireless transmitter mounted on the bracket in the honing tool in

[0036] In the figure: 1, nut; 2, shaft connector; 3, spacer sleeve; 4, fixing ring; 5, pin; 6, sleeve; 7, tool shank; 8, reamer rod; 9, ultrasonic power supply; 10, transducer; 11, wireless transmitter; 12, first base plate; 13, ball slide plate; 14, first ball; 15, second base plate; 16, spring; 17, cam; 18, second ball; 19, top plate; 20, adjusting screw; 21, through groove; 22, groove; 23, bracket. Specific embodiments

[0037] The following further describes the present invention in conjunction with the accompanying drawings of the specification and specific embodiments:

[0038] Refer to Figures 1 to 3 The honing tool for fine machining of tapered holes shown, including a floating tool shank assembly, the floating tool shank assembly has a tool shank 7, the honing tool further includes an ultrasonic power supply 9, a wireless transmitter 11 electrically connected to the ultrasonic power supply 9 and capable of emitting a magnetic signal, and a transducer 10 provided on the tool shank 7. The transducer 10 can receive the magnetic signal of the wireless transmitter 11 and convert it into mechanical vibration. When the honing tool works, the emission end face of the wireless transmitter 11 faces the transducer 10.

[0039] The transducer 10 has a piezoelectric ceramic sheet and an induction coil. The electrical signal of the ultrasonic power supply 9 is converted into a magnetic signal by the wireless transmitter 11, the magnetic signal is converted into an electrical signal via the induction coil, the electrical signal is conducted to the piezoelectric ceramic sheet and converted into a mechanical vibration signal, and then conducted to the tool shank 7 to drive the reamer rod 8 to make high-frequency micro-vibrations in the axial direction together.

[0040] See Figures 5 to 6 , the wireless transmitter 11 is installed on the bracket 23. The bracket 23 is fixed to the machine tool through its fixing ring, does not rotate with the main shaft of the machine tool, and the height of the bracket 23 is adjustable to adapt to the position change of the tool holder 7 in the Z-axis direction. The transmitting end face of the wireless transmitter 11 is an arc surface. When the honing tool works, the distance between this arc surface and the transducer 10 is 0.4 - 0.9 mm to ensure the stable conversion between magnetic and electrical signals.

[0041] See Figures 1 to 2 , the floating tool holder assembly further includes a hollow shaft connection assembly, a cam assembly arranged inside the shaft connection assembly, and a nut 1 connected to the shaft connection assembly. The nut 1 is used to connect with the main shaft of the machine tool.

[0042] The shaft connection assembly includes a hollow shaft connector 2 connected to the nut 1 and a hollow sleeve 6 threadedly connected to the shaft connector 2. The interior of the shaft connector 2 communicates with the interior of the sleeve 6.

[0043] One end of the tool holder 7 is inserted into the interior of the sleeve 6 through one end of the sleeve 6 and is connected to one end of the cam assembly. The cam assembly is connected to the shaft connector 2 through a pin 5 arranged movably. When the main shaft of the machine tool rotates, it drives the shaft connector 2 to rotate, and then drives the cam assembly to rotate through the transmission of the pin 5, thereby driving the tool holder 7 to rotate.

[0044] There is a gap between the outer side wall of the cam assembly and the inner side wall of the shaft connection assembly, so that the cam assembly can float in the radial direction of the honing tool within the shaft connection assembly, and the floating amount is 0.5 - 1.5 mm.

[0045] Specifically, the cam assembly includes a cam 17 arranged inside the shaft connector 2. The floating tool holder assembly further includes a top plate 19 movably arranged between one end of the cam 17 and the shaft connector 2. A first ball 14 is arranged between one end of the cam 17 and the top plate 19. An installation groove for installing the first ball 14 is recessed inward on the end face of the cam 17, and the first ball 14 is installed in the installation groove.

[0046] The other end of the cam 17 is connected to the tool shank 7; the floating tool shank assembly further includes a first base plate 12 and a second base plate 15 sequentially arranged between the other end of the cam 17 and the sleeve 6, a plurality of second balls 18 arranged between the first base plate 12 and the second base plate 15, and a ball slide plate 13 arranged between the first base plate 12 and the second base plate 15 for mounting the plurality of second balls 18; the first base plate 12 is located between the cam 17 and the second balls 18, the second base plate 15 is located between the second balls 18 and the sleeve 6, and an elastic member is arranged between the first base plate 12 and the cam 17. The elastic member is a spring 16 extending along the axial direction of the honing tool, and both ends of the spring 16 are fixed to the first base plate 12 and the cam 17 by glue respectively. Specifically, a plurality of springs 16 (such as 4) are evenly distributed in the circumferential direction of the tool shank 7 to make the tool shank 7 return to the correct position when the tool shank 7 is not subject to external force.

[0047] The first base plate 12, the second base plate 15, and the ball slide plate 13 are respectively sleeved on the tool shank 7, and there is a gap of 0.5 - 1.5 mm between the first base plate 12, the second base plate 15 and the tool shank 7 respectively, while there is a gap of 2 - 3 silk between the first base plate 12, the second base plate 15 and the inner side wall of the sleeve 6; there is a gap of 2 - 3 silk between the ball slide plate 13 and the tool shank 7, and there is a gap of 0.5 - 1.5 mm between the ball slide plate 13 and the inner side wall of the sleeve 6; there is a gap of 5 - 10 silk between the second balls 18 and the ball slide plate 13, the second balls 18 can move on the ball slide plate 13, and the surface of the second balls 18 is coated with lubricating grease.

[0048] The gap between the maximum outer diameter of the part of the cam 7 in the shaft connector 2 and the inner side wall of the shaft connector 2 is 0.5 - 1.5 mm, and the gap between the maximum outer diameter of the part of the cam 7 in the sleeve 6 and the inner side wall of the sleeve 6 is 0.5 - 1.5 mm, so that the floating amount of the floating tool shank assembly is 0.5 - 1.5 mm. In the present invention, the floating amount refers to the distance amount that the floating tool shank assembly moves radially unilaterally from the return position to the honing tool.

[0049] The floating principle is as follows: when the tool shank 7 floats in the radial plane of the honing tool, it drives the ball slide plate and the second balls 15 to float in the radial plane between the first base plate 12 and the second base plate 15, and the first balls 14 at the end of the cam 17 slide on the top plate 19.

[0050] The size of the above floating amount can also be adjusted by an adjusting assembly. Specifically, the adjusting assembly includes an adjusting screw 20 threadedly connected to the shaft connector 2 and having one end abutted against the top plate 19.

[0051] See Figure 3 , annular through grooves 21 are formed on opposite sides of the side wall of the shaft connector 2, and the through grooves 21 extend along the axial direction of the honing tool. See Figure 4, annular grooves 22 are formed on opposite sides of the cam 17 and at positions corresponding to the annular through grooves 21. The grooves 22 extend along the axial direction of the honing tool. Pins 5 are movably inserted into the two-side through grooves 21 and the grooves 22. A spacer sleeve 3 for restricting the pins 5 within the through grooves 21 and the grooves 22 is inserted into the two-side through grooves 21. The pins 5 have a movable clearance of 5 - 7 mm in the axial direction of the honing tool within the through grooves 21. Similarly, the pins 5 also have a movable clearance of 5 - 7 mm in the axial direction of the honing tool within the grooves 21 to accommodate the position change of the pins 5 when the adjusting screw 20 adjusts the cam 7. For example, taking Figure 1 as a reference, when the adjusting screw 20 rotates downward, the adjusting screw 20 applies downward pressure to the top plate 19, thereby changing the friction force between the second ball 18 and the first bottom plate 12, and thus adjusting the floating amount. During the machining process of the tapered hole, the floating amount is adjusted to ensure the perpendicularity machining accuracy requirement between the tapered hole and the end face.

[0052] There is a clearance of 0.5 - 1.5 mm between the pins 5 and the side walls on both sides of the through grooves 21, and there is also a clearance of 0.5 - 1.5 mm between the pins 5 and the side walls on both sides of the grooves 22.

[0053] The floating tool holder assembly further includes an elastic fixing ring 4 sleeved outside the two-side spacer sleeves 3.

[0054] The honing tool further includes a reamer bar 8 that can be detachably connected to the tool holder 7. The reamer bar 8 is threadedly connected to the tool holder 7, which is convenient for tool changing.

[0055] Through the above-described honing tool, the problems of poor perpendicularity and large finishing allowance encountered during the finish machining of the tapered hole can be solved. The accuracy requirements of the tapered hole can be met without manual grinding, the production efficiency is greatly improved, and the sizes of different tapered holes on the same part can be kept consistent. The surface finish of the tapered hole is greatly improved compared with manual grinding.

[0056] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and shall not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

[0057] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

Claims

1. A honing tool for finish machining of tapered holes, including a floating tool shank assembly, the floating tool shank assembly having a tool shank, characterized in that: The honing tool further includes an ultrasonic power supply, a wireless transmitter electrically connected to the ultrasonic power supply and capable of emitting a magnetic signal, and a transducer disposed on the tool shank. The transducer can receive the magnetic signal of the wireless transmitter and convert it into mechanical vibration. The floating tool shank assembly further includes a hollow shaft connection assembly and a cam assembly disposed within the shaft connection assembly. One end of the tool shank is inserted into the shaft connection assembly and connected to one end of the cam assembly. The cam assembly and the shaft connection assembly are connected by a pin disposed movably. When the shaft connection assembly rotates, the cam assembly is driven to rotate through the transmission of the pin, and then the tool shank is driven to rotate. There is a gap between the outer sidewall of the cam assembly and the inner sidewall of the shaft connection assembly, so that the cam assembly can float in the radial direction of the honing tool within the shaft connection assembly.

2. The honing tool for finish machining of tapered holes according to claim 1, characterized in that: When the honing tool is working, the emitting end face of the wireless transmitter faces the transducer.

3. The honing tool for finish machining of tapered holes according to claim 2, wherein: The emitting end face of the wireless transmitter is an arc surface. When the honing tool is working, the distance between the arc surface and the transducer is 0.4 - 0.9 mm.

4. The honing tool for finish machining of tapered holes according to claim 1, wherein: The cam assembly includes a cam disposed within the shaft connection assembly. The floating tool shank assembly further includes a top plate movably disposed between one end of the cam and the shaft connection assembly. A first ball is disposed between the one end of the cam and the top plate. The other end of the cam is connected to the tool shank. The floating tool shank assembly further includes a first bottom plate and a second bottom plate sequentially disposed between the other end of the cam and the shaft connection assembly, a plurality of second balls disposed between the first bottom plate and the second bottom plate, and a ball slide plate for mounting the plurality of second balls disposed between the first bottom plate and the second bottom plate. The first bottom plate is located between the cam and the second balls, the second bottom plate is located between the second balls and the shaft connection assembly, and an elastic member is disposed between the first bottom plate and the cam. The elastic member extends along the axial direction of the honing tool. The first bottom plate, the second bottom plate, and the ball slide plate are respectively sleeved on the tool shank, and there are gaps between the first bottom plate, the second bottom plate and the tool shank respectively. There is a gap between the ball slide plate and the inner sidewall of the shaft connection assembly.

5. The honing tool for finish machining of taper holes according to claim 4, wherein: The floating tool shank assembly further includes an adjustment assembly for adjusting the floating amount of the cam assembly. The adjustment assembly includes an adjustment screw threadedly connected to the shaft connection assembly and having one end abutted against the top plate.

6. The honing tool for finish machining of tapered holes according to claim 5, characterized in that: The shaft connection assembly includes a shaft connector and a sleeve connected to the shaft connector. The top plate is disposed between the cam and the shaft connector. The adjustment screw is threadedly connected to the shaft connector. The second bottom plate is disposed between the second balls and the sleeve.

7. The honing tool for finishing tapered holes according to claim 5, characterized in that: The floating amount is 0.5 to 1.5 mm; and / or, annular through grooves are formed on opposite sides of the side wall of the shaft connection assembly, and the through grooves extend along the axial direction of the reaming and honing tool; annular grooves are formed at positions corresponding to the through grooves on opposite sides of the cam assembly, and the grooves extend along the axial direction of the reaming and honing tool; pins are movably inserted into the through grooves and the grooves on both sides, and a spacer sleeve for limiting the pins in the through grooves and the grooves is inserted into the through grooves on both sides; the pins have a movable gap of 5 to 7 mm in the axial direction of the reaming and honing tool in the through grooves; the floating tool shank assembly further includes an elastic fixing ring sleeved outside the spacer sleeves on both sides; and / or, the floating tool shank assembly further includes a nut connected to the shaft connection assembly, and the nut is used for connecting with the main shaft of the machine tool.

8. The honing tool for finish machining of tapered holes according to claim 1, characterized in that: The reaming and honing tool further includes a reamer bar that can be detachably connected to the tool shank.

9. A machine tool, comprising a reaming and honing tool, characterized in that: The reaming and honing tool is the reaming and honing tool according to any one of claims 1 to 8.

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