CN201279603Y - Follow-up adjustable boring-bar supporting device - Google Patents

Abstract

The utility model discloses a follow-up adjustable boring bar support device, which includes a support body, which is characterized in that the support body is provided with a reinforcing rib structure on the outer circumferential surface and protrudes from the outer circumferential surface and forms an angle of 120° with each other. Three cylindrical support columns evenly distributed, the cylindrical support columns are equipped with adjustable devices. During the boring process, the support device is assembled on the boring bar, and the boring bar rotates and moves axially in the hole of the workpiece, and the adjustable device ensures that the outer ring of the rolling bearing and the surface of the inner hole of the workpiece have a slight pressure and Rolling contact can be used to support single-support overhanging boring bars for workpieces with different inner diameters, eliminate vibration, bending deformation and other defects caused by overhanging boring bars, and meet the processing requirements of improving bore size and axial precision. The follow-up adjustable boring bar support device has simple structure, convenient installation, strong practicability, high degree of standardization and generalization of parts and components, and has certain popularization and application value.

Description

A follow-up adjustable boring bar support device

technical field

The utility model relates to the technical field of mechanical processing, in particular to a follow-up adjustable boring bar support device for boring and machining large-diameter long holes.

Background technique

In recent years, the processing demand for large and large diameter hole sleeves has increased sharply. Traditional ordinary boring machines or special boring machines are used to bore large diameter and long inner holes. In order to ensure the axial accuracy of boring holes, most of them adopt double support structure or single support at present. Structured way to support the boring bar. The boring bar is supported by a double support structure, that is, a support is used to hold the boring bar at the front and rear of the workpiece to bore the hole. Due to the large size and the heavy weight of the boring bar, the ordinary boring machine or special boring machine with a double support structure increases the length of the guide rail and the working space of the machine tool. On the one hand, it leads to material consumption and waste of funds; on the other hand, The area occupied by the machine tool increases, and it is inconvenient to produce, debug, install, transport, and use. Compared with the method of supporting the boring bar with a single support structure for boring large-diameter and long-sized inner holes, although it has the advantages of reducing the occupied area of the machine tool, the single support structure of the boring machine The boring bar is a cantilever arm, and there are problems such as boring bar vibration and bending deformation during the machining process, which affects the processing quality of the workpiece.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, and to solve the problem that the ordinary boring machine or the special boring machine adopts a single support structure when boring large-diameter and long-sized inner holes, and the vibration and bending deformation of the boring bar affect the processing of the processed parts. For the technical problem of quality, design a support device that is installed and fixed on the boring bar of the single-support structure boring machine, and moves and rotates with the boring bar and can adjust the contact according to the size of the inner hole of the workpiece to be processed. The support device can not only solve the problem of large land space when adopting the double support structure, but also solve the problems such as vibration and bending deformation of the boring bar when adopting the single support structure, so as to ensure the boring accuracy of the inner hole.

In order to achieve the above purpose, a follow-up adjustable boring bar support device provided by the utility model includes: a support body 1, a threaded rod 2, a lock nut 3, a cylindrical pin 4, a bearing seat 5, a rolling bearing 6, a keyway 7, Lifting ring 8, cylindrical support column 9.

Wherein the support body 1 is provided with three cylindrical support columns 9 that protrude from the outer cylindrical surface and are evenly distributed at an angle of 120° to each other on the outer cylindrical surface of the rib structure, and the support body 1 and the cylindrical support column 9 is an integral structure. Wherein, the cylindrical support column 9 is processed with an axial threaded hole matched with the threaded rod 2; the central inner hole provided with the support body 1 also has a keyway 7 on the central inner hole, corresponding to the outer cylindrical surface of the keyway 7 A suspension ring 8 is installed, and a bearing seat 5 is installed on the other end of the threaded rod 2 that is matched with the cylindrical support column. There is a lock nut 3, and the rolling bearing 6 is assembled on the cylindrical pin 4, and is connected with the bearing housing 5 through the cylindrical pin 4. The central inner hole of the above-mentioned support body 1 is a conical hole with a taper of 1:10. The size of the central inner hole is the same as that of the boring bar with a 1:10 taper on the single-support boring machine used for installation. match;

The two ends of the above-mentioned threaded rod 2 are threads, and the threads are all fine threads, the thread length is one end long, one end short, and the middle section is hexagonal column shape;

The above-mentioned rolling bearing 6 is a 6202 type rolling bearing.

The beneficial effects of the utility model are mainly reflected in that the application of the supporting device can provide effective support for the overhanging boring bar of the single-support structure boring machine, and by adjusting the extension length of the threaded rod 2, the single Support the support of the overhanging boring bar to eliminate the defects such as vibration and bending deformation caused by the overhanging boring bar, and then meet the processing requirements of improving the boring size and axial precision. Ordinary boring machine with single support structure or special boring machine is compact in structure, and its external structure size is only about 2/3 of that of double support structure boring machine; taking a large diesel engine cylinder liner rough boring machine with an inner diameter of 900mm and a length of 3500mm as an example, if the double support structure The overall dimensions of the special plane are 18m long, and the length of the boring bar is 11m, while the external dimension of the single-support structure special plane is 12m long, and the length of the boring bar is 7m. The maximum deflection of the bending deformation of the boring bar on the double support structure boring machine is w _max ＝-0.1698mm, and the maximum rotation angle is θ _max ＝-0.127rad; while the cantilever boring bar on the single support structure boring machine is bent and deformed after applying the support device The maximum deflection of the boring bar is w _max ＝-0.1307mm, and the maximum rotation angle is θ _max ＝-0.0849rad. The reduction of the deflection and rotation angle of the boring bar is of substantial help to the improvement of the machining accuracy of the cylinder liner. It can be seen that the use of the support device not only solves the problem of large space for the special boring machine with double support structure, but also solves the problems of vibration and bending deformation of the overhanging boring bar existing in the special boring machine with single support structure. The support device is easy to install, easy to operate, and has high standardization and generalization of parts and components. The supporting device of the utility model can be operated commercially, and the technology can be put into market promotion and application, and can create considerable economic value.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the left side view of Fig. 1 of the utility model;

In the figure: 1. Support body, 2. Threaded rod, 3. Lock nut, 4. Cylindrical pin, 5. Bearing seat, 6. Rolling bearing, 7. Keyway, 8. Lifting ring, 9. Cylindrical support column.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the device of the present utility model is described further in detail.

As shown in Figures 1 and 2, a follow-up adjustable boring bar support device of the present invention includes: a support body 1, a threaded rod 2, a lock nut 3, a cylindrical pin 4, a bearing seat 5, a rolling bearing 6, Keyway 7, lifting ring 8, cylindrical support column 9. Among them, the support body 1 is provided with three cylindrical support columns 9 that protrude from the outer cylindrical surface and are evenly distributed at 120° on the outer cylindrical surface of the rib structure, and the support body 1 and the cylindrical support columns 9 are integrated. structure. Among them, an axial threaded hole is machined in the center of the cylindrical support column 9 so as to connect with the threaded rod 2; the central inner hole of the support body 1 is a conical hole with a taper of 1:10, which is used for installation and the corresponding single support The boring bar on the boring machine also has a position fit of 1:10 taper; there is also a keyway in the center hole of the support body 1, and a half round key is installed in the keyway 7 and the corresponding boring bar keyway, so that the support body 1 can follow the boring bar. For rotary motion and axial feed movement; the mounting screw hole of the lifting ring 8 is designed on the top of the support body 1 for assembling the lifting ring 8, and the lifting ring 8 is used for lifting and installing the support body 1; it is a support body 1 and a cylinder of an integral structure Shaped support column 9 adopts No. 45 steel material, and machining is finished after casting steel forming, and support body 1 outer ring is the rib structure. The threaded rod 2 is made of high-quality steel. The thread of the threaded rod 2 is consistent with the axial threaded hole processed in the center of the cylindrical support column 9. One end is connected with the axial threaded hole processed in the center of the cylindrical support column 9, and the other end is connected with the The bearing seat 5 is connected, and a section of the threaded rod 2 close to the bearing seat 5 is made into a hexagonal shape, so as to clamp and rotate to adjust the extension length of the threaded rod 2; two lock nuts 3 lock the threaded rod 2 and the cylindrical support column respectively 9. The end face of the bearing seat 5 is used to fix the adjusted extension length of the threaded rod 2; the adjusted extension length of the threaded rod 2 is to ensure that the outer ring of the rolling bearing 6 has a certain light pressure. The rolling bearing 6 is assembled on the cylindrical pin 4, and then connected with the bearing seat 5 through the cylindrical pin 4, and the outer ring of the rolling bearing 6 makes rolling contact with the surface of the inner hole of the workpiece.

When working, install a half-round key in the corresponding keyway on the boring bar, hoist the support body 1 and install it on the corresponding single-support boring machine boring bar, which also has a taper of 1:10. At the same time, the half-round key also falls into the In the keyway 7; after the taper surface of the inner hole of the support body 1 is closely connected with the corresponding taper surface on the boring bar, it is pressed with a stop nut on the boring bar that is close to its end face, so as to ensure that the supporting device and the boring bar are tightly combined during work. Works reliably. Then install the boring tool and adjust the threaded rod 2 of the adjustable boring bar support device so that the rotation diameter of the adjustable boring bar support device is smaller than the diameter of the inner hole processed by the boring tool; when the boring bar drives the boring tool to process the workpiece The axial distance between the inner hole and the machined workpiece hole is just enough to ensure that after the adjustable boring bar support device enters the workpiece hole, adjust the threaded rod 2 of the boring bar support device to ensure that the outer ring of the rolling bearing 6 is aligned with the machined workpiece. The surface of the inner hole of the part has a slight pressure and makes rolling contact. Two lock nuts 3 lock the threaded rod 2, the cylindrical support column 9, and the end face of the bearing seat 5 respectively, and fix the adjusted extension length of the threaded rod 2. The rear boring bar can drive the boring tool to process the workpiece in the axial direction under the support of the adjustable boring bar supporting device. In order to ensure that the follow-up adjustable boring bar support device can follow the rotation and axial movement of the boring bar without being disturbed by machining chips, auxiliary processes such as brushes or low-pressure air blowing can be added in front of the rolling elements of the rolling bearing 6 according to the chip status. Measures to ensure the normal and reliable follow-up adjustable boring bar support device with the rotation and axial movement of the boring bar.

Since the adjustable device is in contact with the inner processed surface of the workpiece hole by the rolling bearing 6, the outer ring of the rolling bearing 6 is also a circular arc surface like the inner hole, so surface-surface or line-line contact can be realized between them. Damage to the machined surface is minimized. During the boring process, the follow-up adjustable support device is completely fixed on the boring bar and moves axially with the boring bar in the inner hole, so that the problems of bending deformation and deflection caused by the overhanging boring bar can be controlled to a minimum Inside.

Claims (8)

1. A follow-up adjustable boring bar support device, comprising a support body (1), characterized in that: the support body (1) is provided on the outer peripheral surface of the rib structure with protruding outer peripheral surfaces and mutually There are three cylindrical support columns (9) that are evenly distributed at an angle of 120°, and the cylindrical support columns (9) are processed with axial threaded holes that are matched with the threaded rod (2); the support body (1) is provided with Also offer a keyway (7) on the central inner hole of the center, the outer peripheral surface of corresponding keyway (7) is provided with and installs a suspension ring (8), and the other threaded rod (2) that is connected with cylindrical support column (9) A bearing seat (5) is installed at one end; a lock nut (3) is arranged between the threaded rod (2) matched with the cylindrical support column (9) and the end face connected to the bearing seat (5); the bearing seat ( 5) A straight pin (4) is installed on the straight pin (4), and a rolling bearing (6) is assembled on the straight pin (4). 2. A follow-up adjustable boring bar support device according to claim 1, characterized in that: the central inner hole provided on the support body (1) is a conical hole with a taper of 1:10, The size of the central inner hole matches the boring bar with a taper of 1:10 for installation and corresponding single support boring machine. 3. A follow-up adjustable boring bar support device according to claim 1, characterized in that: the support body (1) and the cylindrical support column (9) are an integral structure. 4. A follow-up adjustable boring bar support device according to claim 1 or 3, characterized in that: the support body (1) and the cylindrical support column (9) are an integral structure made of No. 45 steel is obtained by machining after forming of cast steel. 5. A follow-up adjustable boring bar support device according to claim 1, characterized in that: both ends of the threaded rod (2) are threaded, and the thread length is one end long, one end short, and the middle section It is hexagonal. 6. A follow-up adjustable boring bar support device according to claim 5, characterized in that the threads at both ends of the threaded rod (2) are fine threads. 7. A follow-up adjustable boring bar support device according to claim 1, 5 or 6, characterized in that: said threaded rod (2) is made of high-quality steel. 8. A follow-up adjustable boring bar support device according to claim 1, characterized in that: the rolling bearing (6) is a 6202 type rolling bearing.

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