CN104942526B - Large internal thread rolling strengthening device and application method thereof - Google Patents

Abstract

The invention relates to a mechanical processing process equipment, in particular to a large internal thread rolling strengthening device and an application method thereof, belonging to the technical field of thread strengthening. A large-scale internal thread rolling strengthening device, which is characterized in that: there is an annular rolling body and a rotating body, and the rotating body is nested in the annular rolling body; , a slideway is provided on the outer wall of the rotating body; the annular rolling body is provided with a roller, a support arm, a pin shaft, an open ring, and a sliding seat, and the inner wall of the open ring is provided with the same taper as that of the rotating body, and the roller passes through the support arm 1. The pin shafts are evenly distributed on the outside of the open ring, and the sliding seats are evenly arranged on the inner wall of the open ring; the sliding seats are placed in the slideways of the rotating body, and the sliding seats are slidingly matched with the slideways. The invention has a reasonable and simple structure, and is easy to manufacture. Through the invention, the extrusion force is larger and more uniform, and the rolling strengthening effect on large internal threads is better.

Description

A large-scale internal thread rolling strengthening device and its application method

technical field

The invention relates to a mechanical processing process equipment, in particular to a large internal thread rolling strengthening device and an application method thereof, belonging to the technical field of thread strengthening.

Background technique

Threaded connection is an important connection method. Large-scale internal threads are widely used in aviation assembly, oil drilling, pipeline connections, etc. The structural characteristics of internal threads determine that they have high stress concentration factors. Under high-frequency complex loads The root of the thread is prone to cracks, which eventually lead to fatigue failure. At present, the rolling reinforcement of the traditional thread adopts the method of relying on the force of the spring on the ordinary lathe, and the method of single-point rolling. The extrusion force generated by this method is difficult to control, and it is easy to cause uneven extrusion force, especially for large internal threads. The extrusion force is far from the requirement of rolling strengthening. The structure of the internal thread itself is complex, and the traditional shot peening and laser strengthening processes are not suitable.

Contents of the invention

The present invention aims at the above-mentioned problems in the prior art, and provides a large-scale internal thread rolling strengthening device and an application method thereof, which have a larger and more uniform extrusion force and a better effect on large-scale internal thread rolling strengthening.

The technical solution of the present invention is a large-scale internal thread rolling strengthening device, which is characterized in that: an annular rolling body and a rotating body are provided, and the rotating body is nested in the annular rolling body; the rotating body is in the shape of a rounded frustum, A chuck is arranged above the rotating body, and a slideway is arranged on the outer wall of the rotating body; the annular rolling body is provided with rollers, support arms, pin shafts, open rings, and sliding seats, and the inner wall of the open ring is provided with the same The taper, the rollers are evenly arranged on the outside of the open ring through the support arm and the pin shaft, and the sliding seat is evenly arranged on the inner wall of the open ring; the sliding seat is placed in the slideway of the rotating body, and the sliding seat and the sliding The track slides to match.

The lower part of the slideway is provided with a stopper, and the inner minimum diameter of the open ring is equal to the cross-sectional diameter of the rotating body at the upper end of the stopper under the condition of no stress. road.

There are 4 rollers, and the 4 rollers are evenly distributed around the outside of the open ring in a spiral shape.

The chuck is a cylindrical shape that matches the clamping of the three-jaw chuck of the lathe.

An application method of a large-scale internal thread rolling strengthening device, which is characterized in that: a large internal thread rolling strengthening device and an internal thread workpiece to be rolled and strengthening processing are installed on a lathe, and the chuck above the rotating body is clamped On the three-jaw chuck of the lathe, the annular rolling body is placed in the internal thread hole of the workpiece, and the roller is placed at the root of the internal thread. The lathe drives the rotating body to rotate, and the rotating body drives the open ring through the slideway and the sliding seat. Rotating together, the force of the open ring is expanded, so that the roller produces a rolling force that squeezes the root of the internal thread, and realizes the rolling strengthening of the internal thread.

The invention has a reasonable and simple structure and is easy to manufacture. Through the invention, the large-scale internal thread rolling strengthening device is composed of a roller, a support arm, a pin shaft, an open ring, a sliding seat, a stopper, a slideway, a rotating body, and a chuck. Under the action of the lathe, the rotating body drives the open ring to rotate together through the sliding seat and the slideway. At the same time, the tapered slideway and the sliding seat make the opening ring expand the force to ensure a certain extrusion force between the roller and the internal thread. , the roller rolls the internal thread with the rotation of the open ring to realize the strengthening of the internal thread. The inner side of the split ring and the rotating body have the same taper, so as to ensure that the sliding seat on the inner side of the split ring can cooperate with the slideway on the rotating body. The inner minimum diameter is equal to the diameter of the rotating body at the upper end surface of the stopper under the condition of no force on the open ring. A stopper is arranged below the slideway, and the slide seat slides in the slideway during work, and the stopper prevents the slideway from breaking away from the slideway. The large-scale internal thread rolling strengthening device has four rollers, which are connected to the support arm through the pin shaft, and the four rollers are evenly distributed around the outside of the open ring in a spiral shape with the support arm. A collet is arranged above the rotating body, and the three-jaw chuck of the lathe clamps the collet to drive the rotating body to rotate during operation.

Beneficial effects of the present invention:

1. A large-scale internal thread rolling strengthening device of the present invention applies extrusion force through the open ring with openings. Compared with the extrusion force applied by the spring, the extrusion force exerted by this rigid elastic force is larger and more uniform .

2. A large-scale internal thread rolling strengthening device of the present invention is rolled by four rollers, and compared with single-point steel ball rolling, its rolling one week is equivalent to single-point rolling four weeks, and the rolling efficiency is greatly improved. With less friction, the service life of the device is greatly improved.

3. A large-scale internal thread rolling strengthening device of the present invention has a clear principle, mature technology, simple operation and easy realization.

4. A large-scale internal thread rolling strengthening device of the present invention will be of great significance for improving the strength and service life of large internal threads and promoting the development of related fields.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device of the present invention except for the rotating body.

Fig. 2 is a schematic diagram of the structure in the bottom view direction of Fig. 1 .

Fig. 3 is a schematic structural view of the rotating body in the device of the present invention.

Fig. 4 is a schematic diagram of the distribution of the support arms on the open ring in the device of the present invention.

In the figure: 1 roller, 2 support arm, 3 opening, 4 pin shaft, 5 opening ring, 6 slide seat, 7 block, 8 slideway, 9 rotating body, 10 collet.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and description of the accompanying drawings.

A large-scale internal thread rolling strengthening device is provided with an annular rolling body and a rotating body 9, and the rotating body 9 is sleeved in the annular rolling body. Wherein, the rotating body 9 is in the shape of a rounded truncated cone, and a chuck 10 is arranged above the rotating body 9. The chuck 10 is a cylindrical shape matched with the clamping of the three-jaw chuck of the lathe, and a slideway 8 is set on the outer wall of the rotating body 9; The annular rolling body is provided with a roller 1, a support arm 2, a pin shaft 4, an open ring 5, and a sliding seat 6. The inner wall of the open ring 5 is provided with the same taper as that of the rotating body 9. The roller 1 passes through the support arm 2, the pin The shafts 4 are evenly distributed on the outside of the open ring 5; among them, there are four rollers 1, and the four rollers 1 are evenly distributed around the outside of the open ring 5 in a spiral shape; On the inner wall; the sliding seat 6 is placed in the slideway 8 of the rotating body 9, and the sliding seat 6 is slidingly matched with the slideway 8.

Further, a stopper 7 is set at the bottom of the slideway 8, and the inner minimum diameter of the open ring 5 is equal to the cross-sectional diameter of the rotating body 9 at the upper end of the stopper 7 under the condition of no stress, and the stopper 7 prevents the sliding seat 6 from rotating when the rotating body 9 rotates. Slide in the slideway 8 and break away from the slideway 8.

When in use, a large-scale internal thread rolling strengthening device and the internal thread workpiece to be rolled and strengthened are installed on the lathe, the collet 10 above the rotating body 9 is clamped on the three-jaw chuck of the lathe, and the ring rolling The pressing body is placed in the internal thread hole of the workpiece, the roller 1 is placed at the root of the internal thread, the lathe drives the rotating body 9 to rotate, and the rotating body 9 drives the opening ring 5 to rotate together through the slideway 8 and the sliding seat 6, and the opening ring 5. The expansion of the force makes the roller 1 produce a rolling force that squeezes the root of the internal thread, and realizes the rolling strengthening of the internal thread.

As shown in Figures 1, 2, and 3:

A large-scale internal thread rolling strengthening device mainly consists of a roller 1, a support arm 2, a pin shaft 4, an open ring 5, a sliding seat 6, a stopper 7, a slideway 8, a rotating body 9, and a chuck 10. The rotating body 9 of the large-scale internal thread rolling strengthening device of this embodiment drives the opening ring 5 to rotate together through the sliding seat 6 and the slideway 8 under the action of the lathe, and the tapered slideway 8 and the sliding seat 6 make the opening circular ring 5 rotate together. The ring 5 is expanded under force to ensure a certain extrusion force between the roller 1 and the internal thread, and the roller 1 rolls the internal thread with the rotation of the open ring 5 to realize the strengthening of the internal thread.

As shown in Figures 1 and 2, the inner side of the open ring 5 and the rotating body 9 have the same taper, thereby ensuring that the sliding seat 6 on the inner side of the opening ring 5 and the slideway 8 on the rotating body 9 can cooperate. The inner minimum diameter of the open ring 5 is equal to the diameter of the rotating body 9 at the upper end surface of the stopper 7 under the condition of no force, so that when the sliding seat 6 is at the position of the slideway 8 on the upper end surface of the stopper 7, the open ring 5 and the rotation Body 9 just in time is in natural cooperation state. Block 7 is set below the slideway 8 , and the slide seat 6 slides in the slideway 8 during work, and the stop block 7 prevents the slide seat 6 from breaking away from the slideway 8 . A collet 10 is arranged above the rotating body 9 , and the three-jaw chuck of the lathe clamps the collet 10 to drive the rotating body 9 to rotate during operation. The large-scale internal thread rolling strengthening device has four rollers 1, and the rollers are connected to the support arm 2 through the pin shaft 4.

As shown in Figure 3, the four rollers 1 are evenly distributed around the outside of the open ring 5 in a helical shape with the support arm 2, so that during the rotation, the rollers 1 just roll the root of the internal thread to realize the inner thread. Rolling strengthening of threads.

In the present invention, the collet 10 above the rotating body 9 is clamped in the three-jaw chuck of the lathe. When working, the lathe drives the rotating body 9 to rotate, and the sliding seat 6 and the slideway 8 with the same taper are in the rotating process of the rotating body 9. Play two functions, one is that the rotating body 9 drives the opening ring 5 to rotate through the sliding seat 6 and the slideway 8, and the other is that the sliding seat 6 is constantly moving up and the rotating body 9 is pressed down so that the opening 3 of the opening ring 5 is constantly changing. Large enough to generate sufficient extrusion force, the support arm 2 welded on the outside of the open ring 5 in a spiral shape carries the roller 1 to roll the root of the internal thread with the rotation of the open ring 5, thereby realizing the rolling of the internal thread strengthen.

The parts not involved in the present invention are the same as the prior art or can be realized by adopting the prior art.

Claims (5)

1. A large-scale internal thread rolling strengthening device, characterized in that: there is an annular rolling body and a rotating body (9), and the rotating body (9) is nested in the annular rolling body; the rotating body (9) is Inverted truncated shape, a chuck (10) is provided above the rotating body (9), and a slideway (8) is provided on the outer wall of the rotating body (9); the annular rolling body is provided with a roller (1), a support arm (2 ), pin shaft (4), split ring (5), sliding seat (6), the inner wall of the split ring (5) is provided with the same taper as that of the rotating body (9), and the roller (1) passes through the support arm (2) , The pin shafts (4) are evenly distributed on the outside of the open ring (5), and the sliding seats (6) are evenly distributed on the inner wall of the open ring (5); the sliding seats (6) are placed on the rotating body In the slideway (8) of (9), the sliding seat (6) slides and matches with the slideway (8). 2. A large-scale internal thread rolling strengthening device according to claim 1, characterized in that: the lower part of the slideway (8) is provided with a stopper (7), and the open ring (5) is not stressed Under the condition, the inner minimum diameter is equal to the section diameter of the rotating body (9) at the upper end of the stopper (7), and the stopper (7) prevents the sliding seat (6) from sliding in the slideway (8) and disengaging when the rotating body (9) rotates Slideway (8). 3. A large-scale internal thread rolling strengthening device according to claim 1, characterized in that: there are four rollers (1), and the four rollers (1) are evenly distributed in a spiral shape on the open ring (5 ) around the outside. 4. A large-scale internal thread rolling strengthening device according to claim 1, characterized in that: the chuck (10) is a cylindrical shape that matches the clamping of the three-jaw chuck of the lathe. 5. The application method of a large-scale internal thread rolling strengthening device according to claims 1 to 4, characterized in that: a large internal thread rolling strengthening device and the internal thread workpiece to be rolled and strengthening are installed on the On the lathe, the collet (10) above the rotating body (9) is clamped on the three-jaw chuck of the lathe, the ring-shaped rolling body is placed in the internal thread hole of the workpiece, and the roller (1) is placed on the root of the internal thread position, the lathe drives the rotating body (9) to rotate, the rotating body (9) drives the opening ring (5) to rotate through the slideway (8) and the sliding seat (6), and the opening ring (5) is enlarged to make the roller ( 1) Generate the rolling force that squeezes the root of the internal thread, and realize the rolling strengthening of the internal thread.