Bearing rotation supporting device

Abstract

The utility model relates to the field of part machining, in particular to a bearing rotating and supporting device which comprises a conical ring, an inner supporting ring, a shell and clamping rings located at the front end and the rear end, the conical ring is attached to the conical surface of the inner supporting ring, a pushing ring is arranged at the front end of the conical ring, and the clamping rings are arranged at the front end of the pushing ring. A first screw penetrates through the clamping ring at the front end and is connected with the front end of the inner supporting ring through the pushing ring, and a second screw penetrates through the clamping ring at the rear end and is connected with the rear end of the inner supporting ring. The conical ring consists of a plurality of arc-shaped metal elastic sheets which are uniformly distributed along the circumference; a needle bearing is arranged between the inner supporting ring and the outer shell, thrust roller bearings are arranged at the two ends of the outer shell, at least three key grooves are evenly distributed in the outer shell in the radial direction, and supporting keys are installed in the key grooves. The correcting device is simple in structure, good in correcting effect, low in machining difficulty, high in efficiency and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of part processing field, specifically a kind of bearing rotating support device. BACKGROUND

[0002] The normal process route of deep hole finishing is: drilling→rough boring→reduction→correction→semi-finish boring→chip removal→slag removal→finish hole→hole grinding.Due to the small amount of allowance left after semi-finish boring, it is not easy to correct, and the product processing may face the risk of exceeding the tolerance, so the bottom hole must be corrected and straightened before semi-finish boring (through run-out and wall thickness difference control).Due to the particularity and limitation of deep hole machining conditions, the overhang of the boring bar is too long, the rigidity is insufficient, the deflection is large, the boring head sinks under stress during boring, which causes the eccentricity of the machining center and the product center, and the straightness of the hole deteriorates after a certain depth, and the hole inevitably deviates during machining.If the bottom hole needs to be corrected and straightened for each cut, not only a lot of time and cost will be wasted, but also the boring deviation will still occur during subsequent boring finishing, and for super-long part hole machining, the difficulty increases exponentially, and the above problems will be more serious, which directly affects the product qualification rate.Therefore, before the semi-finish boring process of the deep hole, the straightness of the large hole bottom hole should be effectively controlled to avoid more risks and losses caused by repeated correction.

[0003] The traditional correction method is to rotate the workpiece and fix the boring bar, and the boring bar and boring head key groove are clamped and locked by support blocks.Due to the long-time rotation and wear of the support blocks and the hole wall of the workpiece, the support gap increases, which causes the straightness of the hole to increase after the machining depth is increased, causing significant quality risks for subsequent finishing;The super-long part hole refers to an inner hole with a depth of more than 15m.At present, the first piece of a certain ship type propeller shaft in the country has a length of more than 21 meters during deep hole machining, and the large hole depth is more than 19 meters, the large hole depth accounts for 0.9 of the total shaft length, and the large hole straightness is ≤φ1.0, and the coaxiality of large and small holes is ≤φ1.25.During machining, the hole's maximum wall thickness difference still exceeds 5mm through repeated correction by re-machining the frame position and conventional correction method.Therefore, it is also difficult to meet the final drawing requirements using conventional methods to correct the hole's wall thickness difference.

[0004] CN117358967A discloses a boring bar intermediate support device for deep hole machining equipment, which comprises a left connecting disc, a rotating support, an oil cylinder, a hydraulic control and a system operation program. The right end of the left connecting disc is connected with the rotating support through bolts, the right end of the rotating support is connected with the oil cylinder through bolts, there is a thrust sleeve connection between the rotating support and the oil cylinder, the right end of the oil cylinder is provided with oil inlet and oil return channels and is connected with a three-position four-way electromagnetic valve of the hydraulic control part through a hose, and then forms a closed loop with an oil tank. The scheme controls the extension and retraction of the rotating support by controlling the action of the oil cylinder through the program in the operation system to play a supporting role, which needs to increase the corresponding oil circuit and valve device, not only high cost, but also inconvenient control, and there is an oil pipe interference problem; the machining aperture is limited, and for machining small aperture and large step hole products, the installation space is insufficient, and during the rotary machining process, the oil pipe is prone to breakage, iron filings are accumulated to cut off the hose, the oil cylinder has no action, and the supporting effect cannot be achieved in time, which causes hidden troubles to the product quality. SUMMARY

[0005] The utility model discloses a bearing rotary support device with simple structure, good supporting stability, good deviation rectification effect, low machining difficulty, high efficiency and convenient operation, which is used for boring deviation rectification of an ultra-long part inner hole.

[0006] The utility model discloses a bearing rotary support device, which comprises a conical ring, an inner support ring and an outer shell which are sequentially sleeved from inside to outside, and snap rings located at the front and rear ends, wherein the conical ring is in contact with the conical surface of the inner support ring, the front end of the conical ring is provided with a pushing ring, a first screw passes through the front end of the snap ring, penetrates through the pushing ring and is connected with the front end of the inner support ring, and a second screw passes through the rear end of the snap ring and is connected with the rear end of the inner support ring; the conical ring is composed of a plurality of arc-shaped metal elastic sheets which are uniformly distributed along the circumference.

[0007] A needle roller bearing is arranged between the inner support ring and the outer shell, thrust roller bearings are arranged at the two ends of the outer shell, at least three key grooves are uniformly distributed along the radial direction of the outer shell, and support keys are arranged in the key grooves.

[0008] Thrust rings are arranged at the two ends of the inner support ring and the outer shell, the first screw passes through the front end of the snap ring, penetrates through the pushing ring, penetrates through the thrust ring and is connected with the front end of the inner support ring, the second screw passes through the rear end of the snap ring, penetrates through the thrust ring and is connected with the rear end of the inner support ring, and thrust roller bearings are arranged between the thrust rings and the outer shell.

[0009] The outer shell has a protruding part outward at the key groove, and the maximum outer diameter of the snap ring is smaller than the minimum outer diameter of the outer shell.

[0010] A Glee ring for bidirectional sealing is further arranged between the thrust ring and the outer shell.

[0011] Adjusting washers are arranged between the support keys and the key grooves.

[0012] A spacer is arranged between the thrust roller bearing and the housing, and a bearing retainer is arranged between the rear end of the needle roller bearing and the spacer.

[0013] A boring correction method for machining an inner hole of an ultra-long part, comprising the following steps:

[0014] 1) Measure the wall thickness of the inner hole of the part in different directions with a thickness gauge, record and calculate the wall thickness difference, find the bottom hole depth L with a wall thickness difference of ≤0.2mm, and the hole root wall thickness difference, i.e. the correction amount α; measure the actual size d of the bottom hole, calculate the diameter size d+α of the re-boring hole according to the actual size plus the required correction amount α of the hole

[0015] 2) Install a sharp cutter on the boring head, control the rotation of the part, and bore into the hole from the hole opening of the part to a depth of the length that can be supported by the boring head, complete the sharp cutter pilot hole according to the calculated diameter size d+α of the re-boring hole, and the depth of the sharp cutter pilot hole is the length that can be supported by the boring head; remove the sharp cutter on the boring head, replace it with a light cutter, and the light cutter is clamped to the hole wall, and the boring depth is to the depth of the sharp cutter pilot hole, then the boring head is installed with a sharp cutter and a light cutter to expand the hole bottom hole d to (d+α+h)mm, h=0.1-0.5mm;

[0016] 3) Remove the sharp cutter and the light cutter from the boring head, replace it with a boring cutter, and install and lock the bearing rotating support device at the connection between the adjacent two boring bars, and the boring cutter is clamped to the hole wall by 0.1-0.15mm, and the boring depth is to the depth of the sharp cutter pilot hole, at this time all the bearing rotating support devices installed between the two boring bars are located in the hole and are in a supporting state; control the bearing rotating support device to have a 0.2-0.5mm gap between the upward supporting key and the hole wall, and the other supporting keys are tightly clamped to the hole wall.

[0017] 4) Control the boring machine to rotate the boring bar, and the part is stationary, and boring operation is performed, and during boring, the boring bar is supported in the hole by multiple bearing rotating support devices, and the overhanging boring head and boring bar are lifted until the boring operation is completed.

[0018] In the step 2), after completing the sharp cutter pilot hole, measure the size of the bottom hole processed by the sharp cutter, and the light cutter is clamped to the hole wall with a bottom hole size d+(0.1-0.5mm), and the boring depth is to the depth of the sharp cutter pilot hole.

[0019] In the step 3), before the boring cutter enters the inner hole, according to the recorded wall thickness difference, rotate the part to the position where the wall thickness is the thickest and upward, and then place and clamp it.

[0020] In the step 3), when the multi-section boring bar is supported by the plurality of support frames, all bearing rotating support devices are first installed on the first section boring bar and the first screw and the second bolt are loosened, the bearing rotating support device is not clamped on the boring bar; when the first section boring bar enters the hole and the connecting part of the first section boring bar and the second section boring bar approaches the hole opening, the first bearing rotating support device is placed on the connecting part and the first screw and the second bolt of the bearing rotating support device are locked to clamp the connecting part; in this way, the other bearing rotating support devices are sequentially locked on the connecting parts between the other adjacent boring bars.

[0021] In view of the problems in the background art, the inventors have made the following improvements:

[0022] The bearing rotating support device of the utility model adopts pure mechanical structure, has no program control and hydraulic oil circuit arrangement, and has simple structure and long service life; the taper ring and the inner support ring are matched by taper surfaces, when the bearing rotating support device is sleeved on the connecting part of the adjacent two sections of boring bar, the first screw and the second bolt are tightened, the push ring pushes the taper ring backward, and the first locking is completed; when the boring bar moves forward in the hole, the product hole wall and the support key are rubbed, the friction force pushes the shell of the bearing rotating support device to the rear, the taper ring and the inner support ring are pressed more and more tightly, the taper ring is matched with the inner support sleeve to clamp the boring bar, and the second locking is completed; here, the taper ring is composed of a plurality of arc-shaped metal elastic sheets uniformly distributed along the circumference, can conduct the axial force and deform to a certain extent when subjected to the axial force from the push ring, generate the counterforce to clamp the boring bar, the metal snap ring at both ends is used for limiting, avoids the axial movement on the boring bar after installation, the thrust ring can prevent the axial movement of the thrust roller bearing, and the gasket can play the bidirectional sealing role, supports the boring bar with the support sleeve to open into the deviation correction position to play the supporting role. The key grooves are uniformly distributed along the circumference of the shell, and the key groove parts are protruding, facilitating the machining cutting discharge; the adjusting gaskets are arranged between the support keys and the key grooves, and by replacing the gaskets with different thicknesses, the boring bar can be supported for multiple hole deviation correction.

[0023] This utility model relates to a bearing rotary support device. Through radial and rotational forces from needle roller bearings, it achieves synchronous positioning of the support block and the workpiece hole wall. The support block only bears the supporting force, eliminating rotational friction and preventing boring deviation caused by support block wear. A correction boring head is connected to the front end of the boring bar. Operating the deep hole drilling and boring machine rotates the boring bar, and the boring head enters the inner boring hole for correction. During boring, multiple sets of bearing rotary support devices rotate and support, lifting the overhanging boring head and boring bar, preventing the boring head from sinking and the boring bar from deflecting due to rotational torque and radial cutting. A small gap is left between the support block and the hole wall, preventing axial movement and seizing caused by tool wear and inner hole shrinkage. This allows the correction boring head to reach the root of the deep hole, effectively controlling the straightness requirements of the deep hole. This utility model has a good correction effect; a single correction can straighten a large hole, and the wall thickness difference at the root of the large hole is controlled within a very small range. Compared with the traditional multiple correction method, it is more efficient and can eliminate the adverse effects of boring head sinking and boring bar overhang deflection on hole machining. The entire machining process is stable and the surface quality is good. For propeller shaft deep holes with a length of up to 19 meters, the straightness of the large hole reaches φ0.7mm and the coaxiality of the large and small holes is φ0.53mm. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the bearing rotation support device of this utility model.

[0025] Figure 2 This is a view from another direction of the bearing rotation support device of this utility model.

[0026] Figure 3 This is a schematic diagram of the conical ring structure.

[0027] Figure 4 This is a diagram showing the working state of the bearing rotation support device of this utility model.

[0028] Figure 5 This is a view from another direction showing the working state of the bearing rotation support device of this utility model.

[0029] Among them, 1-conical ring, 1.1-metal spring, 2-inner support ring, 3-outer shell, 3.1-protrusion, 4-clamping ring, 5-push ring, 6-first screw, 7-second screw, 8-needle roller bearing, 9-thrust roller bearing, 10-keyway, 11-support key, 12-thrust ring, 13-Glyd ring, 14-adjusting shim, 15-shim, 16-bearing retaining ring, 17-part, 18-boring rod, 19-boring head, 20-bearing rotation support device. Detailed Implementation

[0030] The present invention will be further explained below with reference to the accompanying drawings:

[0031] See Figures 1-2The utility model discloses bearing rotating support device includes the conical ring 1, inner support ring 2 and shell 3 of the order of from inside to outside suitably, with the snap ring 4 of front, back two ends, wherein, the conical ring 1 with the inner support ring 2 taper face is attached, the front end of conical ring 1 is equipped with the push ring 5, the both ends of inner support ring 2 and shell 3 are equipped with the thrust ring 12, prevent the axial migration of thrust roller bearing 9, first screw 6 passes through the front end's snap ring 4, push ring 5, thrust ring 12 and the front end connection of inner support ring 2 in proper order, and second screw 7 passes through the back end's snap ring 4, thrust ring 5 and the back end connection of inner support ring 2, refer to Figure 3 The conical ring 1 is composed of a plurality of arc-shaped metal elastic sheets 1.1 uniformly distributed along the circumference, has high strength and good elasticity, can be axially pushed by the push ring 5 to cooperate the conical surface of the inner support ring 2, and is fixed on the boring bar 18, and will not be moved by the friction force acting on the boring bar 18.

[0032] The inner support ring 2 and the shell 3 are provided with needle roller bearings 8 therebetween, mainly play the role of rotating support, and the radial force of the boring bar 18 in the machining process is borne by the bearings; the thrust ring 12 and the shell 3 are provided with thrust roller bearings 9 therebetween, mainly bear the axial thrust of the bearing rotating support device during the movement inside the hole in the machining process. The two sets of bearings cooperate to avoid the end face friction of the inner and outer rings rotating with each other, so that the wear and burnout of the matching surface and the problem of the inner and outer rings not working normally are avoided.

[0033] At least three key grooves 10 (three key grooves 10 in the embodiment) are uniformly distributed on the shell 3 along the radial direction, the support keys 11 (realizing the support in three directions on the circumference of the shell, and the uppermost support has a gap of 0.2-0.5 mm) are arranged in the key grooves 10, the adjusting washers 14 are arranged between the support keys 11 and the key grooves 10, the gap between the support keys 11 and the hole wall is adjusted by replacing adjusting washers 14 of different specifications, and the hole is supported during multiple hole correction. The shell 3 has a protruding portion 3.1 outward at the key groove 10, so that the machining cutting is discharged, and the maximum outer diameter of the snap ring 1 is smaller than the minimum outer diameter of the shell 3, so that the iron filings are not hooked and prevented from being wound on the device.

[0034] The thrust ring 12 and the shell 3 are also provided with a Gley ring 13 for bidirectional sealing, effectively preventing impurities in the cutting fluid from entering the sealing surface, and avoiding the burnout and jamming of the bearing.

[0035] The thrust roller bearings 9 and the shell 3 are provided with washers 15, and the rear end of the needle roller bearings 8 and the washers 15 are also provided with bearing retaining rings 16.

[0036] The inner support ring 2 can be made of alloy steel material, the support keys 11 can be made of bakelite or nylon material, and the shell 3 can be made of aluminum alloy material.

[0037] The working principle of the bearing rotating support device is:

[0038] First, loosen the first screw 6 and the second bolt 7, and then assemble the bearing rotating support device on the boring bar 18. Then, tighten the first screw 6 and the second bolt 7, and the thrust ring 5 pushes the conical ring 1 backward to complete the first locking. When the boring bar 18 moves forward in the hole, the part 17 hole wall and the support key 11 rub, and the friction force pushes the housing 3 of the bearing rotating support device backward, and the conical ring 1 and the inner support ring 2 are pressed more and more tightly, and the conical ring cooperates with the inner support sleeve to lock the boring bar, and the second locking is completed.

[0039] Embodiment of boring correction method for machining inner hole of super-long part:

[0040] 1) Use a thickness gauge to measure the wall thickness of the inner hole of the part in different directions, record and calculate the wall thickness difference, and find the bottom hole depth L with a wall thickness difference ≤0.2mm and the hole root wall thickness difference, i.e. correction amount α, through the wall thickness data; measure the actual size d of the bottom hole, and calculate the diameter size d+α of the re-boring hole according to the actual size plus the required correction amount α of the hole;

[0041] 2) The boring head 19 (a common boring head can be used, and a deep hole machining boring head with a front guide sleeve with a patent number ZL201420597341.7 and an invention name is preferably used) is equipped with a sharp cutter, and the part 17 is controlled to rotate, and the sharp cutter is bored into the hole from the inner hole of the part 17, and the depth is the length that can be supported by the boring head 19. According to the calculated diameter size d+α of the re-boring hole, the sharp cutter pilot hole is completed, and the sharp cutter pilot hole depth is the length that can be supported by the boring head;

[0042] Remove the sharp cutter on the boring head 19, replace it with a light cutter, measure the size of the bottom hole processed by the sharp cutter, and the light cutter is close to the hole wall to align the cutter. The light cutter is close to the hole wall to align the cutter with the bottom hole size d+(0.1-0.5mm), and the boring depth is to the sharp cutter pilot hole depth. Then, the boring head is equipped with a sharp cutter and a light cutter to expand the hole bottom hole d to (d+α+h)mm, h=0.1-0.5mm;

[0043] 3) Remove the sharp cutter and the light cutter from the boring head 19, and replace them with a boring cutter. Before the boring cutter enters the inner hole of the part 17, according to the recorded wall thickness difference, rotate the part 17 to the position where the wall thickness is the thickest and upward, and then place and clamp the part to be clamped;

[0044] The bearing rotating support devices are sleeved and locked at the connecting position of the two adjacent boring bars 18, and the specific method is as follows: when the multiple boring bars 18 which have not entered the hole of the part are supported by the multiple support frames, all the bearing rotating support devices are first installed on the first boring bar and the first screw 6 and the second bolt 7 are loosened, and the bearing rotating support devices are not clamped on the boring bar 18; when the first boring bar enters the hole and the connecting position of the first boring bar and the second boring bar approaches the hole, the first bearing rotating support device is placed at the connecting position and the first screw 6 and the second bolt 7 of the bearing rotating support device are locked to clamp the connecting position; in this way, the other bearing rotating support devices are sequentially locked at the connecting positions between the other adjacent boring bars.

[0045] The boring cutter is retracted by 0.1-0.15 mm from the hole wall, and the boring depth is to the depth of the sharp cutter guide hole, at this time, all the bearing rotating support devices sleeved between the two boring bars 18 are located in the hole and are in the supporting state; the support keys 11 of the bearing rotating support devices which are controlled to face upwards have a gap of 0.2-0.5 mm from the hole wall, and the other support keys 11 are tightly attached to the hole wall.

[0046] 4) The machining starting point and the rear pointer of the deep hole drilling and boring machine at this time are recorded, the hole depth is recorded, the boring bar 18 is controlled to rotate, the part 17 is stationary, the boring operation is performed, and the boring bar 18 is supported in the hole by the multiple bearing rotating support devices during the boring operation, so that the overhanging boring head 19 and the boring bar 18 are lifted until the boring operation is completed.

[0047] After the above-mentioned one-time correction, the large hole is straightened, and the wall thickness difference at the root of the large hole is controlled within a very small range. Compared with the traditional multiple correction method, the efficiency is high, the adverse effects of boring head sinking and boring bar overhanging deflection bending on hole machining can be eliminated, the machining process is stable, the bottom hole consistency and smoothness are high, the support block wear is small, and the straightness requirement of the full-length hole can be effectively controlled.

[0048] According to actual operation, the propeller shaft with a length of more than 21 m is machined by adopting the utility model, the large hole depth is 19 m, the proportion of the full shaft length is 0.9, the wall thickness difference at the root of the large hole is reduced to be controlled within 0.3 mm after one-time correction from the deviation of 7 mm, the straightness of the large hole is φ0.7 mm, and the coaxiality of the large hole and the small hole can reach φ0.53 mm.

Claims

1. A bearing rotary support device characterized by, The cone ring, the inner support ring and the outer shell are sequentially sleeved from inside to outside, and snap rings are arranged at the front and rear ends, wherein the cone ring is in contact with the inner support ring, the front end of the cone ring is provided with a pushing ring, a first screw passes through the front end snap ring, the pushing ring and the front end of the inner support ring, and a second screw passes through the rear end snap ring and the rear end of the inner support ring; the cone ring is composed of a plurality of arc-shaped metal elastic sheets which are uniformly distributed along the circumference. Rolling needle bearings are arranged between the inner support ring and the outer shell, and the outer shell is provided with thrust roller bearings at the two ends, the outer shell is provided with at least three key grooves which are uniformly distributed along the radial direction, and support keys are arranged in the key grooves.

2. The bearing rotary support apparatus as set forth in claim 1, wherein The inner support ring and the outer shell are provided with thrust rings at the two ends, the first screw passes through the front end snap ring, the pushing ring, the thrust ring and the front end of the inner support ring in sequence, the second screw passes through the rear end snap ring, the thrust ring and the rear end of the inner support ring in sequence, and thrust roller bearings are arranged between the thrust rings and the outer shell.

3. The bearing rotary support apparatus as set forth in claim 1 or 2, characterized by The outer shell is provided with outward protruding parts at the key grooves, and the maximum outer diameter of the snap ring is smaller than the minimum outer diameter of the outer shell.

4. The bearing rotary support apparatus as set forth in claim 2, wherein Gleit rings for bidirectional sealing are further arranged between the thrust rings and the outer shell.

5. The bearing rotary support apparatus as set forth in claim 2 wherein, Adjusting washers are arranged between the support keys and the key grooves.

6. The bearing rotary support apparatus as set forth in claim 2 wherein, Washers are arranged between the thrust roller bearings and the outer shell, and bearing retainer rings are further arranged between the rear ends of the rolling needle bearings and the washers.

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