Rotatably expandable honing spindle structure and method for honing with rotatable expansion

Abstract

This invention proposes a rotatable and expandable honing spindle structure and a rotary expansion method for honing. The spindle structure includes: a spindle; a rotary expansion mechanism including a tension rod that passes through the spindle axially; the rotary expansion mechanism further includes: a first transition plate connecting a pulley on the spindle and a reducer mounting base; the reducer mounting base has a mounting groove in which a steel wheel harmonic reducer and a rotary tension rod connecting disc are arranged; wherein, the steel wheel harmonic reducer includes a front steel wheel, a middle steel wheel, a rear steel wheel, two wave generators (front and rear), and two flexible wheels (front and rear); the front wave generator is keyed to the expansion motor connecting shaft, and the expansion motor connecting shaft is connected to the output shaft of the expansion servo motor via fasteners; the front flexible wheel meshes with both the front steel wheel and the middle steel wheel; the rear wave generator is connected to a harmonic fixing base, which is mounted on a motor support via fasteners. The rear flexible wheel meshes with both the rear steel wheel and the middle steel wheel; the rear steel wheel is fixed to the reducer mounting base by fasteners, and the front steel wheel is fixed to the rotating expansion rod connecting plate by fasteners; the rotating expansion rod connecting plate and the first transition plate are rotatably connected, and the plate is connected to the expansion rod key; the wave generator is rotatably connected to the rotating expansion rod connecting plate and the reducer mounting base. This invention features high rotational accuracy and the ability to expand during spindle rotation.

Description

Technical Field

[0001] This invention belongs to the field of deep hole honing machine tool technology, and particularly relates to a rotatable and expandable honing spindle structure and a rotatable and expandable method for honing. Background Technology

[0002] Deep hole honing machines mostly use axial displacement expansion or gearbox structure rotation expansion, which has high manufacturing cost, complex mechanism and large size, difficult installation and adjustment, and inconvenient operation and gear shifting. Summary of the Invention

[0003] The purpose of this invention is to provide a rotatable and expandable honing spindle structure and a rotary expansion method for honing, wherein the spindle structure can expand during spindle rotation. The technical solution adopted is as follows:

[0004] A rotatable and expandable honing spindle structure, comprising:

[0005] Spindle 1;

[0006] The rotary expansion mechanism 8, used to drive the tool to rotate and expand, includes a strut 8-7, which passes axially through the spindle 1 and is connected to the tool. The rotary expansion mechanism 8 also includes:

[0007] The first transition plate 8-1 connects the pulley on the main shaft 1 and the reducer mounting base 8-2; the reducer mounting base 8-2 has a mounting groove, in which a harmonic reducer 8-3 and a rotary expansion rod connecting plate 8-6 are installed;

[0008] The harmonic reducer 8-3 includes a front wave generator, a front flexible wheel, a rear wave generator, a rear flexible wheel, and a front steel wheel, a middle steel wheel, and a rear steel wheel arranged in sequence; the front flexible wheel, the rear flexible wheel, the front steel wheel, and the rear steel wheel have the same number of teeth; the middle steel wheel has a greater number of teeth than the front flexible wheel; the front flexible wheel is connected to the surface of the front wave generator; and the rear flexible wheel is connected to the surface of the rear wave generator.

[0009] The front wave generator is keyed to the expansion motor connecting shaft 8-4, and the expansion motor connecting shaft 8-4 is rotatably connected to the rotating expansion rod connecting plate 8-6; the expansion motor connecting shaft 8-4 passes through the harmonic fixing seat 8-16 and is connected to the output shaft of the expansion servo motor 8-8; the housing of the expansion servo motor 8-8 is fixedly installed;

[0010] The rear wave generator is mounted on the harmonic fixing seat 8-16, and the harmonic fixing seat 8-16 is connected to the servo motor connecting seat 8-9 by fasteners.

[0011] The front flexible wheel meshes with both the front steel wheel and the middle steel wheel, and the rear flexible wheel meshes with both the rear steel wheel and the middle steel wheel.

[0012] The rear steel wheel is fixed to the reducer mounting base 8-2 by fastener 8-15. The front steel wheel is connected to the rotating expansion rod connecting plate 8-6 by fastener. The middle steel wheel is in contact with both the rear steel wheel and the front steel wheel. The rotating expansion rod connecting plate 8-6 is rotatably connected to the first transition plate 8-1 and is keyed to the expansion rod 8-7.

[0013] Preferably, the expansion motor connecting shaft 8-4 and the rotating expansion rod connecting disc 8-6 are connected by a first bearing 8-5;

[0014] The outer ring of the first bearing 8-5 is embedded in the rotating expansion rod connecting disc 8-6, and its inner ring is sleeved on the expansion motor connecting shaft 8-4.

[0015] Preferably, the expansion motor connecting shaft 8-4 is provided with a shoulder and a groove, and a retaining ring is provided on both the shoulder and the groove to limit the first bearing 8-5.

[0016] Preferably, the rotating expansion rod connecting plate 8-6 and the first transition plate 8-1 are connected by a second bearing 8-17.

[0017] Preferably, the housing of the extended servo motor 8-8 is fixed to the second transition plate 8-11 by fasteners, and the second transition plate 8-11 is disposed on the servo motor connecting seat 8-9.

[0018] Preferably, the main shaft 1 is connected to the reducer 5 via belt drive, and the reducer 5 is connected to the motor 4.

[0019] Preferably, the first fastener 8-15 is a cylindrical head screw.

[0020] A rotary expansion method for honing, based on the aforementioned rotatable expandable honing spindle structure, includes the following steps:

[0021] Step 1: The main shaft drives the rear steel wheel and the front steel wheel to rotate synchronously.

[0022] When the main shaft 1 rotates, the expansion servo motor 8-8 does not work. At this time, the reducer mounting base 8-2 rotates with the main shaft 1, and the rear steel wheel rotates with the reducer mounting base 8-2.

[0023] The rear steel wheel drives the rear flexible wheel to rotate, the rear flexible wheel drives the middle steel wheel to rotate, the middle steel wheel drives the front flexible wheel to rotate, and the front flexible wheel drives the front steel wheel to rotate.

[0024] Since the front wave generator and the rear wave generator are stationary, the front flexible wheel spins freely on the front wave generator and the rear flexible wheel spins freely on the rear wave generator.

[0025] Step 2: The front steel wheel drives the rotating expansion rod connecting plate 8-6 to rotate;

[0026] Step 3: Rotate the expansion rod connecting plate 8-6 to drive the expansion rod 8-7 to rotate, and the front steel wheel and the rear steel wheel rotate synchronously;

[0027] Step 4: Start the expansion servo motor 8-8, and rotate the expansion rod 8-7 to the set angle:

[0028] When the expansion servo motor 8-8 rotates, the expansion motor connecting shaft 8-4 drives the front wave generator to rotate at a set angle, and then the expansion motor 8-8 stops rotating.

[0029] The front and rear steel wheels generate a phase difference, which expands during the rotation of the main shaft.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] 1. When expansion motion is not required, the expansion servo motor 8-8 does not rotate, while the spindle 1 rotates. During the spindle rotation, the tool and the expansion shaft (expansion rod 8-7) can rotate synchronously.

[0032] Synchronous rotation is used to apply preload, and its principle is as follows:

[0033] The rear steel wheel rotates, driving the rear flexible wheel and the middle steel wheel to rotate. The middle steel wheel, in turn, drives the front flexible wheel and the front steel wheel to rotate. At this time, the front and rear steel wheels move synchronously.

[0034] 2. When expansion motion is required, the expansion servo motor 8-8 rotates at the corresponding angle, and a phase difference is generated between the front steel wheel and the rear steel wheel of the steel wheel harmonic reducer 8-3.

[0035] The expansion rod 8-7 rotates relative to the spindle, thereby driving the tool to perform an expansion motion. The specific process is as follows:

[0036] The tool housing is fixedly connected to the spindle, and the tool rotation expansion core is connected to the expansion rod via a square key.

[0037] Based on existing technology:

[0038] The rotating expansion core is located inside the tool housing.

[0039] As shown in Figure 10(a), the abrasive strip holder rack meshes with the rotating expansion core of the cutting tool. When the rotating expansion core of the cutting tool rotates forward and backward, it drives the abrasive strip holder rack to expand and retract. Attached Figure Description

[0040] Figure 1 Schematic diagram of the transmission principle of a rotatable and expandable honing spindle structure;

[0041] Figure 2 for Figure 1 A partial sectional view;

[0042] Figure 3 for Figure 2 A partial view;

[0043] Figure 4 This is an outline drawing of a rotatable and expandable honing spindle structure.

[0044] Figure 5 A cross-sectional view of the rotatable and expandable honing spindle structure;

[0045] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0046] Figures 7-8 An exploded view of the rotatable and expandable honing spindle structure;

[0047] Figure 9 Here is a structural diagram of the connecting cylinder;

[0048] Figure 10(a) is a schematic diagram of the honing tool installation;

[0049] Figure 10(b) is a schematic diagram of the expansion rod.

[0050] 1-Spindle, 2-Spindle housing, 3-Motor bracket, 4-Spindle drive motor, 5-Reducer, 6-Pulley, 7-Synchronous belt;

[0051] 8-Rotary expansion mechanism;

[0052] 8-1-First transition plate, 8-2-Reducer mounting base, 8-3-Harmonic reducer, 8-4-Expansion motor connecting shaft;

[0053] 8-5-First bearing, 8-6-Rotating expansion rod connecting plate, 8-7-Expansion rod, 8-8-Expansion servo motor;

[0054] 8-9-Servo motor connector, 8-10-First retaining ring, 8-11-Second transition plate, 8-12-Speed ​​switch mounting plate, 8-13-Speed ​​switch, 8-14-Second retaining ring; 8-15-First fastener, 8-16-Harmonic fixing seat, 8-17-Second bearing, 8-18-Connecting sleeve. Detailed Implementation

[0055] The rotatable expandable honing spindle structure and the rotary expansion method for honing of the present invention will be described in more detail below with reference to schematic diagrams, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0056] like Figures 1-8 A rotatable and expandable honing spindle structure for metalworking equipment, particularly suitable for deep hole honing machine tools, comprising:

[0057] Spindle 1;

[0058] The rotary expansion mechanism 8, used to drive the tool to rotate and expand, includes a strut 8-7 that passes axially through the spindle 1 and is keyed to the tool. Figure 7 As shown, both ends of the expansion rod 8-7 are square keys. The square key at the front end is placed in the square groove of the cutting tool, and the square key at the rear end is placed in the square groove of the rotating expansion rod connecting plate 8-6.

[0059] The rotary expansion mechanism 8 also includes:

[0060] The first transition plate 8-1 connects the pulley on the main shaft 1 and the reducer mounting base 8-2; the reducer mounting base 8-2 has a mounting groove, in which a steel wheel harmonic reducer 8-3 and a rotating expansion rod connecting plate 8-6 are installed.

[0061] Among them, the steel wheel harmonic reducer 8-3 includes a front wave generator, a front flexible wheel, a rear wave generator, a rear flexible wheel, and a front steel wheel, a middle steel wheel, and a rear steel wheel arranged in sequence; the number of teeth of the front flexible wheel, the rear flexible wheel, the front steel wheel, and the rear steel wheel are equal; the number of teeth of the middle steel wheel is greater than the number of teeth of the front flexible wheel; the front flexible wheel is connected to the surface of the front wave generator; and the rear flexible wheel is connected to the surface of the rear wave generator.

[0062] That is, the number of teeth on the front flexible gear is 2 fewer than the number of teeth on the middle steel gear.

[0063] The front wave generator is keyed to the expansion motor connecting shaft 8-4, and the expansion motor connecting shaft 8-4 is rotatably connected to the rotating expansion rod connecting plate 8-6; the expansion motor connecting shaft 8-4 passes through the harmonic fixing seat 8-16 and is connected to the output shaft of the expansion servo motor 8-8; the housing of the expansion servo motor 8-8 is fixedly installed.

[0064] Preferably, the expansion motor connecting shaft 8-4 is connected to the output shaft of the expansion servo motor 8-8 via a connecting sleeve.

[0065] Connecting cylinder, such as Figure 9 As shown, it is keyed to the output shaft of the expansion servo motor 8-8, and a radial hole is opened on it. A set screw is installed in the hole for the limit key.

[0066] The connecting cylinder is interference-fitted with the expansion motor connecting shaft 8-4, and a radial hole 2 is opened on it, with a set screw 2 installed in the hole 2.

[0067] The rear wave generator is mounted on the harmonic mounting bracket 8-16, which is connected to the servo motor connector 8-9 via fasteners. This ensures the rear wave generator remains stationary.

[0068] The front flexible gear meshes with both the front steel gear and the middle steel gear simultaneously, and the rear flexible gear meshes with both the rear steel gear and the middle steel gear simultaneously.

[0069] The rear steel wheel is fixed to the reducer mounting base 8-2 by fastener 8-15, and the front steel wheel is connected to the rotating expansion rod connecting plate 8-6 by fasteners; the rotating expansion rod connecting plate 8-6 and the first transition plate 8-1 are rotatably connected, and it is keyed to the expansion rod 8-7.

[0070] A speed switch mounting plate 8-12 is installed on the servo motor connector 8-9, and a speed switch 8-13 is installed on the speed switch mounting plate 8-12. The speed switch 8-13 is used to detect the groove on the reducer mounting plate 8-2 to measure the spindle speed.

[0071] The expansion rod 8-7 is positioned on the main shaft 1 via a flange. The expansion rod 8-7 and the flange are rotatably connected via bearings.

[0072] In this embodiment, the rotary connection is described as follows:

[0073] The expansion motor connecting shaft 8-4 and the rotating expansion rod connecting plate 8-6 are connected by the first bearing 8-5.

[0074] The outer ring of the first bearing 8-5 is fitted into the connecting sleeve 8-18 of the rotating expansion rod connecting disc 8-6, and its inner ring is fitted onto the expansion motor connecting shaft 8-4. That is, the inner ring of the first bearing 8-5 can rotate with the expansion motor connecting shaft 8-4.

[0075] The connecting sleeve 8-18 and the rotating expansion rod connecting plate 8-6 are integrally formed to form the rotating expansion rod connecting plate 8-6.

[0076] The rotating expansion rod connecting plate 8-6 and the first transition plate 8-1 are connected by a second bearing 8-17; that is, the inner ring of the second bearing 8-17 can rotate with the rotating expansion rod connecting plate 8-6.

[0077] The second bearing 8-17 is axially limited by the first retaining ring 8-14 and the second retaining ring 8-14.

[0078] Both the first bearing 8-5 and the second bearing 8-17 are deep groove ball bearings.

[0079] Furthermore, the expansion motor connecting shaft 8-4 is provided with a shoulder and a groove, and a retaining ring is provided on both the shoulder and the groove to limit the first bearing 8-5.

[0080] Furthermore, the housing of the extended servo motor 8-8 is fixed to the second transition plate 8-11 by fasteners, and the second transition plate 8-11 is disposed on the servo motor connecting seat 8-9.

[0081] like Figures 1-2 As shown, the main shaft 1 is connected to the reducer 5 via belt drive, and the reducer 5 is connected to the motor 4.

[0082] Specifically, the belt drive includes a pulley on the main shaft, a pulley 6 on the reducer 5, and a synchronous belt 7 connecting the two pulleys.

[0083] like Figure 2 The structure of spindle 1 and spindle box 2 is described below:

[0084] The spindle box 2 is used to support the spindle 1 and rotate it.

[0085] The pulley on spindle 1 is keyed to spindle 1.

[0086] In this embodiment, fastener 8-15 is a cylindrical head screw.

[0087] A honing rotational expansion method includes the following steps:

[0088] I. When no expansion exercise is required:

[0089] Step A: The main shaft drives the rear steel wheel and the front steel wheel to rotate synchronously.

[0090] When the main shaft 1 rotates, the expansion servo motor 8-8 does not work. At this time, the reducer mounting base 8-2 rotates with the main shaft 1, and the rear steel wheel rotates with the reducer mounting base 8-2.

[0091] The rear steel wheel drives the rear flexible wheel to rotate, the rear flexible wheel drives the middle steel wheel to rotate, the middle steel wheel drives the front flexible wheel to rotate, and the front flexible wheel drives the front steel wheel to rotate.

[0092] Since the front wave generator and the rear wave generator are stationary, the front flexible wheel spins freely on the front wave generator and the rear flexible wheel spins freely on the rear wave generator.

[0093] Step B: The front steel wheel drives the rotating expansion rod connecting plate 8-6 to rotate;

[0094] Step C: Rotate the expansion rod connecting plate 8-6 to drive the expansion rod 8-7 to rotate.

[0095] II. When expansion exercises are required:

[0096] Step 1: The main shaft drives the rear steel wheel and the front steel wheel to rotate synchronously.

[0097] When the main shaft 1 rotates, the expansion servo motor 8-8 does not work. At this time, the reducer mounting base 8-2 rotates with the main shaft 1, and the rear steel wheel rotates with the reducer mounting base 8-2.

[0098] The rear steel wheel drives the rear flexible wheel to rotate, the rear flexible wheel drives the middle steel wheel to rotate, the middle steel wheel drives the front flexible wheel to rotate, and the front flexible wheel drives the front steel wheel to rotate.

[0099] Since the front wave generator and the rear wave generator are stationary, the front flexible wheel spins freely on the front wave generator and the rear flexible wheel spins freely on the rear wave generator.

[0100] Step 2: The front steel wheel drives the rotating expansion rod connecting plate 8-6 to rotate;

[0101] Step 3: Rotate the expansion rod connecting plate 8-6 to drive the expansion rod 8-7 to rotate, and the front steel wheel and the rear steel wheel rotate synchronously;

[0102] Step 4: Start the expansion servo motor 8-8, and rotate the expansion rod 8-7 to the set angle.

[0103] When the expansion servo motor 8-8 rotates, the expansion motor connecting shaft 8-4 drives the front wave generator to rotate at a set angle, and then the expansion motor 8-8 stops rotating.

[0104] The front and rear steel wheels generate a phase difference, which expands during the rotation of the main shaft.

[0105] During the generation of phase difference, the rear steel wheel, the middle steel wheel, and the rear flexible wheel can be regarded as a whole.

[0106] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A rotatable and expandable honing spindle structure, characterized in that, include: Main spindle (1); A rotary expansion mechanism (8) for driving the tool to rotate and expand includes a strut (8-7) that passes axially through the spindle (1) and is connected to the tool. The rotary expansion mechanism (8) further includes: The first transition plate (8-1) connects the pulley on the main shaft (1) and the reducer mounting base (8-2); the reducer mounting base (8-2) has a mounting groove, in which a harmonic reducer (8-3) and a rotating expansion rod connecting plate (8-6) are installed; The harmonic reducer (8-3) includes a front wave generator, a front flexible wheel, a rear wave generator, a rear flexible wheel, and a front steel wheel, a middle steel wheel, and a rear steel wheel arranged in sequence; the front flexible wheel, the rear flexible wheel, the front steel wheel, and the rear steel wheel have the same number of teeth; the middle steel wheel has a greater number of teeth than the front flexible wheel; the front flexible wheel is connected to the surface of the front wave generator; and the rear flexible wheel is connected to the surface of the rear wave generator. The front wave generator is keyed to the expansion motor connecting shaft (8-4), and the expansion motor connecting shaft (8-4) is rotatably connected to the rotating expansion rod connecting plate (8-6); the expansion motor connecting shaft (8-4) passes through the harmonic fixing seat (8-16) and is connected to the output shaft of the expansion servo motor (8-8); the housing of the expansion servo motor (8-8) is fixedly installed; The rear wave generator is mounted on the harmonic fixing seat (8-16), and the harmonic fixing seat (8-16) is connected to the servo motor connecting seat (8-9) by fasteners; The front flexible wheel meshes with both the front steel wheel and the middle steel wheel, and the rear flexible wheel meshes with both the rear steel wheel and the middle steel wheel. The rear steel wheel is fixed to the reducer mounting base (8-2) by fastener No. 1 (8-15), and the front steel wheel is connected to the rotating expansion rod connecting plate (8-6) by fastener; the middle steel wheel is in contact with both the rear steel wheel and the front steel wheel; the rotating expansion rod connecting plate (8-6) and the first transition plate (8-1) are rotatably connected, and the plate is keyed to the expansion rod (8-7).

2. The rotatable and expandable honing spindle structure according to claim 1, characterized in that, The expansion motor connecting shaft (8-4) and the rotating expansion rod connecting plate (8-6) are connected by a first bearing (8-5); The outer ring of the first bearing (8-5) is embedded in the rotating expansion rod connecting disc (8-6), and its inner ring is sleeved on the expansion motor connecting shaft (8-4).

3. The rotatable and expandable honing spindle structure according to claim 2, characterized in that, The expansion motor connecting shaft (8-4) is provided with a shoulder and a groove, and a retaining ring is provided on both the shoulder and the groove to limit the first bearing (8-5).

4. The rotatable and expandable honing spindle structure according to claim 1, characterized in that, The rotating expansion rod connecting plate (8-6) and the first transition plate (8-1) are connected by a second bearing (8-17).

5. The rotatable and expandable honing spindle structure according to claim 1, characterized in that, The housing of the extended servo motor (8-8) is fixed to the second transition plate (8-11) by fasteners, and the second transition plate (8-11) is disposed on the servo motor connecting seat (8-9).

6. The rotatable and expandable honing spindle structure according to claim 1, characterized in that, The main shaft (1) is connected to the reducer (5) via belt drive, and the reducer (5) is connected to the motor (4).

7. The rotatable and expandable honing spindle structure according to claim 1, characterized in that, The first fastener (8-15) is a cylindrical head screw.

8. A rotary expansion method for honing, based on the rotatable expandable honing spindle structure according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: The main shaft drives the rear steel wheel and the front steel wheel to rotate synchronously. When the main shaft (1) rotates, the expansion servo motor (8-8) does not work. At this time, the reducer mounting base (8-2) rotates with the main shaft (1), and the rear steel wheel rotates with the reducer mounting base (8-2). The rear steel wheel drives the rear flexible wheel to rotate, the rear flexible wheel drives the middle steel wheel to rotate, the middle steel wheel drives the front flexible wheel to rotate, and the front flexible wheel drives the front steel wheel to rotate. Since the front wave generator and the rear wave generator are stationary, the front flexible wheel spins freely on the front wave generator and the rear flexible wheel spins freely on the rear wave generator. Step 2: The front steel wheel drives the rotating expansion rod connecting plate (8-6) to rotate; Step 3: Rotate the expansion rod connecting plate (8-6) to drive the expansion rod (8-7) to rotate, and the front steel wheel and the rear steel wheel rotate synchronously; Step 4: Start the expansion servo motor (8-8), and rotate the expansion rod (8-7) to the set angle: When the expansion servo motor (8-8) rotates, the expansion motor connecting shaft (8-4) drives the front wave generator to rotate by a set angle, and then the expansion servo motor (8-8) stops rotating. The front and rear steel wheels generate a phase difference, which expands during the rotation of the main shaft.

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