CN108788333B - A tapping auxiliary device based on magnetorheological effect - Google Patents

Abstract

The invention discloses a tapping auxiliary device based on a magneto-rheological effect, which mainly comprises a tap wrench, a wrench fixing clamp, a cylindrical roller bearing, a piston, a cylindrical barrel, a base, a tap, an O-shaped sealing ring, a compression spring, a permanent magnet, magneto-rheological fluid, a coil storage barrel and an electromagnetic coil. The device realizes real-time sensing and self-correction of the tap posture under tapping working conditions by utilizing the electromagnetic induction principle of the electromagnetic coil and the permanent magnet and utilizing the reversible continuous rheological effect of the magnetorheological fluid, thereby greatly reducing the requirements on processing technology and experience and improving the processing efficiency and the thread processing quality.

Description

A tapping auxiliary device based on magnetorheological effect

Technical field

The invention relates to a simple tapping auxiliary device, in particular to a tapping auxiliary device based on magnetorheological effect.

Background technique

With the rapid development of my country's industrial manufacturing technology, threaded connection fastening methods are more and more widely used in major projects such as machinery, electronics, aerospace, etc., especially the connection and matching of hole threads. At present, the preparation of hole threads mainly relies on manual tapping, that is, using taps for manual tapping. Therefore, the processing quality directly affects the assembly accuracy and working performance of the product. In addition, high-precision hole thread processing has higher requirements on the operator's processing technology and experience, especially the processing and preparation of small precision hole threads. During the tapping process, the tap is easy to tilt and the wire is easy to break, which in turn leads to The scrapping of the entire product has resulted in a waste of raw materials, an increase in production cycle and processing costs, and needs to be addressed urgently. Therefore, it is very necessary to provide a tapping auxiliary device that can effectively monitor the attitude of the tap in real time during the tapping process and self-correct it to ensure the quality of the threads of small precision holes processed.

Based on the above problems, the present invention proposes a new type of tapping auxiliary device based on magnetorheological effect. This device is based on the rheological effect of magnetorheological fluid and combined with the principle of electromagnetic induction. It can effectively detect the tapping in working conditions in real time. The tap posture can be adjusted and corrected in a timely and effective manner, which greatly reduces the requirements for processing experience and improves processing efficiency and processing quality.

Contents of the invention

In order to overcome the common defects of current thread processing of small precision holes, such as easy tilting of taps, easy wire breakage, and high requirements for operating experience, the present invention provides a new type of tapping auxiliary device based on the magnetorheological effect. The device uses the principle of electromagnetic induction and combines the continuous and reversible rheological effect of magnetorheological fluid to achieve real-time perception and self-correction of the tap state under tapping conditions.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a tapping auxiliary device based on magnetorheological effect. This simple device mainly includes a tap wrench (3), a wrench fixing clip (4), and a cylindrical roller bearing ( 7), piston (6), cylinder (5), base (12), tap (10), O-ring (8), compression spring (11), permanent magnet (9), magnetorheological fluid (13) ), coil storage tube (2) and electromagnetic coil (1).

The tap wrench (3) is fixed on the wrench fixing clamp (4) in order to provide effective tapping rotation torque.

The wrench fixing clamp (4) is disc-shaped, and its upper end surface is provided with a groove for positioning and clamping the tap wrench (3). Its lower end is an interference fit with the cylindrical roller bearing (7).

The cylindrical roller bearing (7) has an interference fit with the shoulder of the piston (6).

The piston (6) is a rotary body with a shoulder on its upper end and a disc structure on its lower end with 4 circular slots for installing and fixing the permanent magnet (9); the disc wall at its lower end has 6 holes. A semicircular through hole serves as a flow channel for the magnetorheological fluid (13).

There are four compression springs (11) in total, and their two ends are fixed on the disc of the piston (6) and the base (12) respectively, in order to provide the upward restoring force of the piston (6).

There are two O-shaped sealing rings (8), which are respectively fixed in the grooves of the cylindrical barrel (5) and the piston (6). The purpose is to maintain the sealing of the magnetorheological fluid (13) and prevent the magnetorheological fluid (13) from leaking during operation. leakage.

The cylindrical tube (5) and the base (12) are fixed through threaded connection.

The magnetorheological fluid (13) is filled in the closed space formed by the cylinder (5), the base (12), the piston (6) and the O-ring (8).

The coil storage tube (2) is fixed on the outer wall of the cylindrical tube (5).

The electromagnetic coil (1) is wound in the coil storage tube (2).

The beneficial effect of the present invention is that the tapping auxiliary device of the present invention detects the acceleration generated when the tap tilts during the tapping process through the electromagnetic induction principle of the electromagnetic coil and the permanent magnet, and utilizes the reversible continuous rheological effect of the magnetorheological fluid, It effectively overcomes the problem of tap inclination being difficult to detect; the device is based on the magnetorheological effect, has a simple working principle and a small and compact structure. It can effectively detect the working posture of the tap in real time and prevent tap breakage caused by the inclination of the tap, thus ensuring Processing quality of small precision hole threads and product yield.

Description of the drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Figure 1 is an overall appearance view of the device of the present invention;

Figure 2 is a cross-sectional view of the present invention;

Figure 3 is an appearance view of the device of the present invention after removing the electromagnetic coil, coil storage tube and cylindrical tube;

In the picture, 1. Solenoid coil, 2. Coil storage tube, 3. Tap wrench, 4. Wrench clamp, 5. Motor frame, 6. Servo motor, 7. Cylindrical roller bearing, 8. O-type sealing ring, 9. Permanent magnet, 10. Tap, 11. Compression spring, 12. Base, 13. Magnetorheological fluid.

Detailed ways

A tapping auxiliary device based on the magnetorheological effect. The simple device includes a tap wrench (3), a wrench clamp (4), a cylindrical roller bearing (7), a piston (6), a cylindrical barrel (5), and a base. (12), tap (10), O-ring (8), compression spring (11), permanent magnet (9), magnetorheological fluid (13), coil storage tube (2) and electromagnetic coil (1). The tap wrench (3) is fixed on the wrench fixing clamp (4) in order to provide effective tapping rotation torque. The wrench fixing clamp (4) is disc-shaped, and its upper end surface is provided with a groove for positioning and clamping the tap wrench (3). Its lower end is an interference fit with the cylindrical roller bearing (7). The cylindrical roller bearing (7) has an interference fit with the shoulder of the piston (6). The piston (6) is a rotary body with a shoulder on its upper end and a disc structure on its lower end with 4 circular slots for installing and fixing the permanent magnet (9); the disc wall at its lower end has 6 holes. A semicircular through hole serves as a flow channel for the magnetorheological fluid (13). There are four compression springs (11) in total, and their two ends are fixed on the disc of the piston (6) and the base (12) respectively, in order to provide the upward restoring force of the piston (6). Two O-rings (8) are fixed in the grooves of the cylindrical tube (5) and the piston (6) respectively. The purpose is to maintain the sealing of the magnetorheological fluid (13) and prevent the magnetorheological fluid (13) from leaking during operation. leakage. The cylindrical tube (5) and the base (12) are fixed through threaded connection. The magnetorheological fluid (13) is filled in the closed space formed by the cylinder (5), the base (12), the piston (6) and the O-ring (8). The coil storage tube (2) is fixed on the outer wall of the cylindrical tube (5). The electromagnetic coil (1) is wound in the coil storage tube (2).

The specific working principle and implementation process of the device of the present invention are as follows: the magnetic field used to control the rheological properties of the magnetorheological fluid (13) in this device is mainly generated by electromagnetic induction, that is, a permanent magnet is installed and fixed on the piston (6) (9) Cut the electromagnetic coil (1) to generate an induced current in the electromagnetic coil (1), thereby forming a strong magnetic field. Compared with the weak magnetic field of the permanent magnet (9) itself, the induced magnetic field has the advantages of large magnetic field intensity and uniform distribution, and can completely control the rheology of the magnetorheological fluid (13). When the rotational torque acts on the tap wrench (3) in a balanced manner, the tap (10) always maintains a vertical machining posture; because the electromagnetic coil (1) fails to induce a magnetic field, the magnetorheological fluid (13) at this time is still Good flow performance is maintained, so the tap (10) can smoothly process threads downward. When the rotational torque applied to the tap wrench (3) is unbalanced, the piston (6) and the tap (10) tilt at the same time. Due to the electromagnetic induction effect, the acceleration generated when the piston (6) tilts causes the permanent magnet (9) to quickly Cut the electromagnetic coil (1) downward, causing the electromagnetic coil (1) to instantly generate a strong induced current, thereby generating a strong magnetic field. Based on the rheological effect of the magnetorheological fluid (13), the magnetorheological fluid (13) at this time instantly changes from a liquid state to a solid-like state under the action of the magnetic field, thus preventing the piston (6) from further tilting. When the tilting motion of the piston (6) tends to be stationary under the action of the magnetorheological fluid (13), that is, the piston (6) has no tilting acceleration, and the permanent magnet (9) at this time has no acceleration relative to the electromagnetic coil (1). Because of the cutting effect, the electromagnetic coil (1) does not generate induced current or magnetic field, and the magnetorheological fluid (13) returns from a solid-like state to a liquid state, maintaining good flow performance. At this time, the inclined piston (6) regains its balance under the elastic restoring force of the compression spring (11), so that the inclined tap (10) is also corrected and maintains the original vertical processing state. At this time, the tap (10) can continue to process the thread downward until the thread processing is completed.

Claims (2)

1. The tapping auxiliary device based on the magneto-rheological effect comprises a tap wrench (3), a wrench fixing clamp (4), a cylindrical roller bearing (7), a piston (6), a cylindrical barrel (5), a base (12), a tap (10), an O-shaped sealing ring (8), a compression spring (11), a permanent magnet (9), magneto-rheological fluid (13), a coil storage barrel (2) and an electromagnetic coil (1); the tap wrench (3) is fixed on the wrench fixing clamp (4), and two ends of the tap wrench (3) are cylindrical handles, so that effective tapping rotation moment is provided; the wrench fixing clamp (4) is a disc type, the upper end face of the wrench fixing clamp is provided with a groove for positioning and clamping the tap wrench (3), and the lower end of the wrench fixing clamp is in interference fit with the cylindrical roller bearing (7); the cylindrical roller bearing (7) is in interference fit with the shaft shoulder of the piston (6); the piston (6) is a revolution body, the upper end of the piston is provided with a shaft shoulder, the lower end of the piston is of a disc structure, and 4 circular grooves are formed for installing and fixing the permanent magnets (9); the wall surface of the lower disc is provided with 6 semicircular through holes which are used as flow channels of magnetorheological fluid (13); the number of the compression springs (11) is 4, and two ends of the compression springs are respectively fixed on the disc of the piston (6) and the base (12) so as to provide upward restoring force for the piston (6); one O-shaped sealing ring (8) is respectively fixed in the grooves of the cylinder (5) and the piston (6) to keep the sealing of magnetorheological fluid (13) and prevent leakage in the working process; the cylindrical barrel (5) and the base (12) are fixedly connected through threads; the magnetorheological fluid (13) is filled in a closed space formed by the cylindrical barrel (5), the base (12), the piston (6) and the O-shaped sealing ring (8); the coil accommodating cylinder (2) is fixed on the outer wall surface of the cylindrical cylinder (5); the electromagnetic coil (1) is wound in the coil accommodating cylinder (2); when the tapping auxiliary device based on the magneto-rheological effect works, as the rotation moment on the tap wrench (3) is unbalanced, the piston (6) and the tap (10) are inclined at the same time, due to the electromagnetic induction effect, the acceleration generated when the piston (6) is inclined causes the permanent magnet (9) to rapidly cut down the electromagnetic coil (1), so that the electromagnetic coil (1) instantaneously generates induction current and then generates a magnetic field, at the moment, the magneto-rheological liquid (13) instantaneously changes from a liquid state to a solid-like state under the action of the magnetic field, further inclination of the piston (6) is prevented, when the inclination motion of the piston (6) tends to be static under the action of the magneto-rheological liquid (13), namely, the piston (6) has no inclination acceleration, at the moment, the permanent magnet (9) has no rapid cutting action relative to the electromagnetic coil (1), the electromagnetic coil (1) has no induction current and induction, the magneto-rheological effect is generated, the magneto-rheological liquid (13) instantaneously changes from a liquid state to a solid-like state under the action, the action of the magneto-rheological liquid returns to a normal state under the moment, the screw tap (10) is restored to a normal working state under the action of the elastic thread (10), the screw thread is restored to a normal working state under the state, and the screw thread is restored to the normal state under the normal working state, and the screw thread is restored, until the thread machining is completed.

2. The tapping auxiliary device based on magneto-rheological effect according to claim 1, wherein the coil housing (2), the cylindrical barrel (5) and the base (12) are all made of silicon steel materials, so that the magnetic field generated by electromagnetic induction of the electromagnetic coil and the permanent magnet is enhanced.