Boring bar follow-up supporting device

Abstract

A boring bar follow-up supporting device is arranged on a boring bar, supports the boring bar and comprises a supporting body, the supporting body is arranged on the boring bar, at least two rolling devices are arranged on the supporting body, and the rolling devices elastically abut against the surface of a machined workpiece through belleville springs and are used for adjusting and improving the rigidity of a process system and achieving the purposes of reducing vibration and eliminating vibration marks. The device has the advantages of being simple, durable, stable, reliable and adjustable in rigidity, the influence of cutting vibration is avoided, and the surface machining quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of boring bar processing, and in particular to a boring bar follower support device. Background Art

[0002] Boring processing is based on the rotation of the boring tool, and the relative movement between the boring tool and the workpiece is the feed motion. Boring processing can achieve the finishing of multiple holes at one time. Since the boring bar itself has a high rotation accuracy, boring processing can produce high-precision holes; in deep hole boring, since the tool extends into the workpiece and has a long cantilever structure, the cutting vibration of the boring bar during processing causes low processing quality, and due to the change in rigidity, it causes the tool to break. The most critical thing is that the processing accuracy and quality cannot be guaranteed;

[0003] In the prior art:

[0004] 1. Utility model CN202291456U deep hole boring bar: The boring bar support device used in this new model uses a steel ball to contact the machined surface to achieve the purpose of improving the rigidity and stabilizing the boring bar. The steel ball can be adjusted in position through a threaded mechanism to ensure point contact with the machined surface and slight pressure.

[0005] 2. Utility model CN201279603Y is a follow-up adjustable boring bar support device: the new boring bar support device uses a rolling bearing to contact the machined surface and has a slight pressure.

[0006] 3. Invention CN102145393B, a follow-up support cutter head device for deep hole processing: This invention also utilizes the contact between the steel ball and the processed surface, and pushes the V-block to move on the end face of the V-block through the radial locking nut, thereby generating a radial force on the steel ball to adjust the diameter of the outer ring of the steel ball so that it contacts and is positioned with the processed surface.

[0007] 4. Utility model CN203184988U radially adjustable boring cutter inner hole support mechanism for boring large deep holes: This new model mainly uses the four supporting wooden blocks of the support mechanism to generate axial and radial friction with the processed hole diameter, while bearing the gravity and boring force of the boring bar. The wooden blocks are made of hardwood and specially treated to have high hardness and wear resistance, and each support block is lubricated. The wooden blocks are adjusted through a threaded mechanism to contact the processed surface.

[0008] 5. Utility model CN205363279U boring bar auxiliary support device: This new model mainly uses wooden blocks for support, but has no adjustment mechanism. The wooden blocks are directly replaced after being worn.

[0009] The above-mentioned existing technology faces the difficulties in machining inner holes in boring processing: large aspect ratio, low machining accuracy, unstable machining quality, difficulty in eliminating the influence of cutting vibration, unsatisfactory effect, difficulty in protecting the machining surface, and limited support stiffness, which cannot meet the needs of eliminating vibration in deep hole boring, and needs to be improved. Summary of the invention

[0010] In view of this and facing the shortcomings of the prior art, the purpose of the present invention is to provide a boring bar follower support device. During deep hole boring, the follower support device is connected to the boring bar of the deep hole boring equipment, and they rotate and move together. The follower support device is supported on the processed inner circle to improve the rigidity of the process system, avoid cutting vibration, and improve processing quality.

[0011] The present application aims to solve one of the problems in the background technology.

[0012] The technical solution adopted by the present invention is: In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a boring bar follower support device;

[0013] A boring bar follower support device is arranged on the boring bar and supports the boring bar, comprising a support body, the support body is arranged on the boring bar, at least two rolling devices are arranged on the support body, and the rolling devices elastically resist the processed workpiece surface.

[0014] A technical solution provided by this application also has the following technical features:

[0015] Preferably, the rolling device array is arranged on the support body.

[0016] Preferably, an embedding groove is provided on the support body, and a rolling device is provided in the embedding groove.

[0017] Preferably, an elastic supporting device is provided below the rolling device.

[0018] Preferably, the rolling device includes a roller shaft and a disc spring that elastically supports the roller shaft, the roller shaft and the disc spring are limited in the support base, the rolling surface of the roller shaft is used to contact the processed workpiece surface, the two ends of the roller shaft are supported in the roller seat, and a roller pressure cover is arranged above the roller shaft to limit the roller shaft in the roller seat; the roller seat is floatingly limited in the support base, grooves are arranged at both ends of the roller seat, and flat keys are fixed in the grooves; key grooves are arranged at the corresponding positions of the support base for limiting the sliding of the flat key, and a roller limiting plate is fixed at the upper end of the support base, and the roller limiting plate is used to limit the sliding limit position of the roller shaft.

[0019] Preferably, a scraper plate is provided on the exposed portion of the roller shaft, and the scraper plate is used to scrape the roller shaft to remove impurities adhered to the surface.

[0020] Preferably, the elastic support device includes a disc spring, a disc spring guide column, and a roller seat. The disc spring guide column is arranged inside the disc spring, and a disc spring adjustment pad is arranged above the disc spring and supports the roller seat through the disc spring adjustment pad.

[0021] Preferably, angular contact ball bearings are provided at both ends of the roller shaft, and a spacer is provided between the angular contact ball bearings and the roller shaft;

[0022] The disc spring guide column is fixed to the bottom of the lower chamber of the support base by screws.

[0023] Preferably, the screw is secured by a compression washer.

[0024] Preferably, a step is provided in the embedded groove, and the rolling device includes a pad, a support base, a screw, an adjustment screw, a roller limit plate, and a flat key;

[0025] The pad is arranged on the step to support the two ears of the supporting base. The center of the supporting base is provided with an upper chamber and a lower chamber. The upper chamber is used to arrange the rolling part of the rolling device, and the lower chamber is used to arrange the elastic supporting device.

[0026] Preferably, the roller cover presses the angular contact ball bearing by means of screws so that the angular contact ball bearing fits the roller seat.

[0027] The present invention has the following beneficial effects:

[0028] 1. In addition to improving the rigidity of the process system, the present invention also has the advantage that the rigidity can be adjusted by the compression of the disc spring. Without the device, the vibration is very large, there are obvious vibration marks, and the processed surface is very rough. With the device, after adjusting the pressing force of the disc spring to an appropriate size, the vibration disappears, and the surface roughness can reach Ra3.2.

[0029] 2. Compared with the prior art, the present invention uses a combination of rollers and disc springs, and uses disc springs to support the rollers on the processed surface of the workpiece with a fixed and adjustable force, thereby improving the support stiffness, and the stiffness is controllable; the rollers are in flexible contact with the inner circle of the workpiece, which greatly reduces the risk of the rollers getting stuck and protects the processed surface; secondly, the rollers can always be kept in contact with the inner circle, and the support will not be too tight or completely detached due to the error of the inner circle processing size;

[0030] 3. The device of the present invention is small in size and adopts a disc spring structure to provide elastic support. Compared with gas and hydraulic supports, it has the characteristics of being simple, durable, stable, reliable and having appropriate strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of a boring bar follower support device of the present invention;

[0032] Figure 2 A top view of a boring bar follower support device of the present invention;

[0033] Figure 3 It is an AA cross-sectional view of a boring bar follower support device of the present invention;

[0034] Figure 4 It is a BB half-section view of a boring bar follower support device of the present invention;

[0035] Figure 5 It is an axial sectional view of a boring bar follower support device of the present invention;

[0036] Figure 6 A three-dimensional diagram of a boring bar follower support device of the present invention;

[0037] Figure 7 It is a processing schematic diagram of a boring bar follower support device of the present invention;

[0038] Figure 8 It is a partial enlarged view of a boring bar follower support device of the present invention;

[0039] In the figure:

[0040] 1. Support

[0041] 2. Pad

[0042] 3. Support base

[0043] 4. Screws

[0044] 5. Spacer

[0045] 6. Scraper plate

[0046] 7. Roller shaft

[0047] 8. Roller capping

[0048] 9. Angular contact ball bearings

[0049] 10. Washer

[0050] 11. Disc spring adjustment pad

[0051] 12. Roller seat

[0052] 13. Adjust the top screw

[0053] 14. Roller limit plate

[0054] 15. Flat key

[0055] 16. Disc spring

[0056] 17. Disc spring guide column

[0057] 18. Boring bar end support

[0058] 19. Workpiece

[0059] 20. Boring bar head support

[0060] 21. Surface to be processed

[0061] 22. Processed surface

[0062] 23. Boring head

[0063] 24. Boring bar shaft. DETAILED DESCRIPTION

[0064] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0065] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0066] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0068] like Figure 1-6 A boring bar follower support device is arranged on the boring bar and supports the boring bar, including a support body 1, the support body 1 is arranged on the boring bar, and at least two rolling devices are arranged on the support body 1, and the rolling devices elastically resist the processed workpiece surface.

[0069] When this application is implemented, it has the following characteristics: the processed surface is used as the supporting surface, and the elastic support protects the processed surface on the one hand, and utilizes the elastic support to slow down and eliminate the vibration of the boring bar, thereby improving the processing quality and the rigidity of the system, and is suitable for application in deep hole processing.

[0070] Specifically, the rolling device array is arranged on the support body 1 .

[0071] Specifically, the support body 1 is provided with an embedding groove, and a rolling device is arranged in the embedding groove.

[0072] Specifically, an elastic supporting device is arranged below the rolling device.

[0073] Specifically, Figure 1-7 The rolling device includes a roller shaft 7 and a disc spring 16 that elastically supports the roller shaft 7. The roller shaft 7 and the disc spring 16 are limited in the support base 3. The rolling surface of the roller shaft 7 is used to contact the surface of the processed workpiece. The two ends of the roller shaft 7 are supported in the roller seat 12. A roller pressure cover 8 is arranged above the roller shaft 7 to limit the roller shaft 7 in the roller seat 12; the roller seat 12 is floatingly limited in the support base 3, and grooves are arranged at both ends of the roller seat 12. A flat key 15 is fixed in the groove; a key groove is arranged at the corresponding position of the support base 3 for limiting the sliding of the flat key 15. A roller limiting plate 14 is fixed at the upper end of the support base 3, and the roller limiting plate 14 is used to limit the sliding limit position of the roller shaft 7.

[0074] Specifically, Figure 2 , 3 A scraper plate 6 is provided on the exposed portion of the roller shaft 7, and the scraper plate 6 is used to scrape the roller shaft 7 to remove impurities adhering to the surface.

[0075] Specifically, Figure 3-5 The elastic supporting device includes a disc spring 16, a disc spring guide column 17, and a roller seat 12. The disc spring guide column 17 is arranged inside the disc spring 16, and a disc spring adjustment pad 11 is arranged above the disc spring 16 and the roller seat 12 is supported by the disc spring adjustment pad 11.

[0076] Specifically, angular contact ball bearings 9 are provided at both ends of the roller shaft 7, and a spacer 5 is provided between the angular contact ball bearings 9 and the roller shaft 7;

[0077] The disc spring guide column 17 is fixed to the bottom of the lower chamber of the support base 3 by means of screws 4 .

[0078] Specifically, the screw 4 is fixed by a compression washer 10 .

[0079] Specifically, a step is provided in the embedded groove, and the rolling device includes a pad 2, a support base 3, a screw 4, an adjustment top screw 13, a roller limit plate 14, and a flat key 15;

[0080] The pad 2 is arranged on the step to support the two ears of the support base 3. The center of the support base 3 is provided with an upper chamber and a lower chamber. The upper chamber is used to set the rolling part of the rolling device, and the lower chamber is used to set the elastic support device.

[0081] Specifically, the roller cover 8 presses the angular contact ball bearing 9 through the screw 4 so that the angular contact ball bearing 9 fits the roller seat 12 .

[0082] Specifically, a boring bar follower support device has three groups of rolling devices evenly distributed on a support body 1. Three groups are used as an example, but it is not limited to three groups, and four groups evenly distributed are also acceptable.

[0083] Specifically, boring bars of different specifications can also use the same support body 1, which is a fixed ring sleeve, as long as the ring sleeve and the boring head 23 can be fixed; the follow-up support, that is, it must move with the boring head 23 during the processing; the effect is that the cutting tool installed on the boring head 23 is close to the distance from the device and always remains consistent, so that the rigidity of the entire cutting will be maintained very well and the processing quality will also be good.

[0084] Specifically, the support base 3 is fixed to the support body 1 by screws 4; the pad 2 under the support base 3 is used to adjust the roller support diameter on the roller shaft 7 over a large range, and the pad 2 of different thicknesses can be replaced; when precise adjustment in a small range is required, the position of the support base 3 is adjusted using the adjusting top screw 13, and then tightened using the screws 4.

[0085] Specifically, the disc spring guide column 17 is installed on the support base 3 and is locked by the saddle screw 4.

[0086] Specifically, a plurality of disc springs 16 are used and assembled after being matched, so as to reduce the rigidity of the disc springs and increase the stroke; for the same clamping force, if only one group of disc springs 16 is used, the compression amount will be very small, but if multiple groups of disc springs 16 are used, the compression amount will be multiplied; the stroke refers to the compression amount of the disc spring 16.

[0087] Specifically, flat keys 15 are installed on both sides of the roller seat 12, and the flat keys 15 can slide up and down along the grooves on the support base 3; a disc spring adjustment pad 11 is provided between the roller seat 12 and the disc spring 16, which is used to adjust the initial preload force of the roller, that is, the force applied by the disc spring 16 to the roller when the roller is not in contact with the machined inner circle of the workpiece 19; the initial preload force can be adjusted to 0, that is, the disc spring 16 is in a free state.

[0088] Specifically, a roller limiting plate 14 is provided above the flat key 15 and is installed on the roller supporting seat to limit the moving range of the roller.

[0089] Specifically, the roller shaft 7 is installed on the roller seat 12 through a group of angular contact ball bearings 9, and the angular contact ball bearings 9 are arranged back to back; the spacers 5 at both ends of the roller shaft 7 are matched during assembly to adjust the bearing clearance, increase the bearing rigidity, and prevent the roller shaft 7 from moving on the roller seat 12.

[0090] Specifically, the roller shaft 7 is made of ductile iron to enhance hardness and wear resistance.

[0091] Specifically, the scraper plate is 3D printed using nylon + glass fiber, which fits closely to the roller to prevent foreign matter such as iron filings from entering.

[0092] Specifically, as shown in Figure 7-8, a typical deep hole boring equipment layout is shown, in which a boring bar passes through a workpiece 19, and a boring bar end support 18 and a boring bar head support 20 are respectively provided at both ends of a boring bar shaft 24, the boring bar shaft 24 can rotate, the boring head 23 can move along the boring bar, and the tool can move radially on the boring head 23.

[0093] The boring bar follower support device for deep hole processing of the present invention is fixed on the boring head 23, and rotates and moves simultaneously with the boring head 23. Before formal processing, the support diameters of the three groups of rollers are adjusted to the inner diameter size to be processed (i.e., the diameter of the processed surface 22) and the roller pressing stroke hX2 is added. When the tool rotates and feeds until the roller enters the workpiece 19, the disc spring 16 of each group of rollers will tighten the roller with the compression force of the total stroke h, which plays a role in increasing rigidity.

[0094] Specifically, as shown in the figure above, the boring bar is fixed together with the follower support device, which can move forward and backward along the axis of the workpiece 19 and perform rotational motion; a section of the inner circle is pre-processed at the entrance of the deep hole of the workpiece 19, and then the roller of the follower support device is adjusted to hold the inner wall of the workpiece 19 with a certain compression amount; the tool is adjusted to contact with the pre-processed inner circle, and then the machine tool drives the workpiece 19 to rotate, and the boring bar is fed forward for cutting.

[0095] Specifically, the same is applicable to the method in which the boring bar is cantilever supported and the boring bar rotates and moves simultaneously.

[0096] In general, the main principle of the boring bar follower support device of the present invention is that the roller can move up and down on the support body 1. Figure 4The position is the position where the disc spring 16 has the smallest compression force. When the roller is pressed toward the center, the disc spring 16 is compressed and tightens the roller with a greater reaction force. After the follow-up support device is fixed to the boring bar, the tool on the boring bar first cuts the surface 21 to be processed of the workpiece 19, and then the follow-up support device is tightened to the processed surface 22. If the initial support diameter of the roller is adjusted to the diameter of the processed surface 22 + 3mm in advance (large and small range adjustments are made through the pad 2 and the adjustment screw 13), then when the roller rotates and moves into the processed surface 22 of the workpiece 19, each group of disc springs 16 will be compressed by 1.5mm, tightening the roller to the inner circle of the workpiece 19, enhancing the rigidity of the boring bar, reducing cutting vibration, and improving dimensional accuracy and surface processing quality.

[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A boring bar follower support device, arranged on the boring bar and supporting the boring bar, characterized in that: The invention comprises a support body (1), wherein the support body (1) is arranged on a boring bar, and at least two rolling devices are arranged on the support body (1), and the rolling devices elastically contact the surface of a processed workpiece.

2. A boring bar follower support device as claimed in claim 1, characterized in that: The rolling device array is arranged on the support body (1).

3. A boring bar follower support device as claimed in claim 1, characterized in that: An embedding groove is provided on the support body (1), and the embedding groove is used to set a rolling device.

4. A boring bar follower support device as claimed in claim 1, characterized in that: An elastic supporting device is arranged below the rolling device.

5. A boring bar follower support device as claimed in claim 1, characterized in that: The rolling device comprises a roller shaft (7) and a disc spring (16) elastically supporting the roller shaft (7); the roller shaft (7) and the disc spring (16) are limited in a support base (3); the rolling surface of the roller shaft (7) is used to abut against the surface of a processed workpiece; both ends of the roller shaft (7) are supported in a roller seat (12); a roller pressure cover (8) is arranged above the roller shaft (7) so that the roller shaft (7) is limited in the roller seat (12); the roller seat (12) is floatingly limited in the support base (3); grooves are arranged at both ends of the roller seat (12), and flat keys (15) are fixedly arranged in the grooves; key grooves are arranged at corresponding positions of the support base (3) for limiting the sliding of the flat keys (15); a roller limiting plate (14) is fixed at the upper end of the support base (3); the roller limiting plate (14) is used to limit the sliding limit position of the roller shaft (7).

6. A boring bar follower support device as claimed in claim 1, characterized in that: A scraper plate (6) is provided on the exposed portion of the roller shaft (7), and the scraper plate (6) is used to scrape the roller shaft (7) to remove impurities adhering to the surface.

7. A boring bar follower support device as claimed in claim 1, characterized in that: The elastic support device comprises a disc spring (16), a disc spring guide column (17), and a roller seat (12); the disc spring guide column (17) is arranged inside the disc spring (16); a disc spring adjustment pad (11) is arranged above the disc spring (16) and supports the roller seat (12) through the disc spring adjustment pad (11).

8. A boring bar follower support device as claimed in claim 1, characterized in that: Angular contact ball bearings (9) are arranged at both ends of the roller shaft (7), and a spacer (5) is arranged between the angular contact ball bearings (9) and the roller shaft (7); The disc spring guide column (17) is fixed to the bottom of the lower chamber of the support base (3) by means of screws (4).

9. A boring bar follower support device as claimed in claim 1, characterized in that: The screw (4) is fixed by means of a compression washer (10).

10. A boring bar follower support device as claimed in claim 1, characterized in that: A step is arranged in the embedded groove, and the rolling device comprises a pad (2), a supporting base (3), a screw (4), an adjusting top screw (13), a roller limiting plate (14), and a flat key (15); The pad (2) is arranged on the step and is used to support the two ears of the support base (3). An upper chamber and a lower chamber are arranged at the center of the support base (3). The upper chamber is used to arrange the rolling part of the rolling device, and the lower chamber is used to arrange the elastic support device. The roller cover (8) is pressed against the angular contact ball bearing (9) by means of a screw (4), so that the angular contact ball bearing (9) fits against the roller seat (12).

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