A spiral extrusion device directly driven by an AC permanent magnet servo motor

Abstract

A spiral extrusion device directly driven by an AC permanent magnet servo motor integrates a set of lead screw nut pairs, internal and external spline sliding pairs and an AC permanent magnet servo motor; an AC permanent magnet synchronous motor is used as a driving motor, and the motor rotor and the internal spline sleeve in the spline sliding pair are designed as one body. During the movement, the motor rotor drives the shaft to rotate circumferentially through the external spline section of the shaft, and the threaded section of the shaft realizes the linear feed movement of the shaft through the lead screw nut pair, so that the extrusion tool installed at the end of the shaft realizes the spiral feed movement, and the spiral feed extrusion speed and torque control of the end of the shaft can be realized by controlling the output of the AC permanent magnet synchronous motor. This device is a "zero transmission" direct drive device without intermediate transmission elements, and has outstanding advantages such as simple structure, high transmission efficiency and easy control.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing, and relates to a spiral extrusion device directly driven by an AC permanent magnet servo motor, which is used in conjunction with an extrusion tap to realize extrusion forming of a spiral raceway with a fixed lead. Background Art

[0002] Processing methods such as spiral extrusion and spiral drilling account for a large proportion in mechanical processing. They have the advantages of high one-time forming efficiency and high processing accuracy. They are commonly used mechanical processing methods for standard parts. Tapping is a typical spiral extrusion processing method. In specific operations, it is required that the pitch of the tap is consistent with the parameters of the internal thread to be processed, that is, when the tap rotates one circle in the circumferential direction, the tap advances one thread lead along its own axial direction. Tapping is generally divided into power tapping and manual tapping. In power tapping, a special tap must be used. The machine tool provides a rotational motion, while the axial feed direction is not restricted. The spiral extrusion operation is realized by the relative spiral motion between the tap and the workpiece. The parameters of the tap determine the parameters of the internal thread to be processed, and the accuracy of the tap determines the accuracy of the internal thread to be processed. However, the difficulty of processing the tap is high and the life is short, which restricts the scope of use of power tapping.

[0003] At present, among the power tapping processing equipment, the common CNC tapping machines and pneumatic tapping machines have the common feature of one or more sets of parallelogram support mechanisms to realize adaptive feed motion during the power tapping process, which have defects such as complex structure, large size, weight and high noise.

[0004] Therefore, the present invention proposes a spiral extrusion device directly driven by an AC permanent magnet servo motor, which adopts the direct drive mode of an AC permanent magnet servo motor to realize the spiral extrusion movement of the extrusion tool, extrude and form an internal thread raceway in a fixed nut to be processed, overcome the defects of existing tapping machines and their tap manufacturing difficulties, and has good engineering practical value. Summary of the invention

[0005] The technical solution adopted by the present invention is as follows:

[0006] A screw extrusion device directly driven by an AC permanent magnet servo motor comprises a stator core 1, a permanent magnet 2, a stator winding 3, a housing 4, a motor rotor 5, a rotary transformer 6, a cover 7, a sleeve 9, a nut cover 10, a shaft 11, and a bearing 12; the cover 7 and the nut cover 10 are respectively fixedly connected to both ends of the housing 4, and together with the housing 4 form a housing of the entire device;

[0007] The sleeve 9 is a spline through hole, and the center of the nut cover 10 has a threaded inner hole; both ends of the sleeve 9 are supported in the inner holes of two bearings 12; a rotary transformer 6 is arranged and installed at one end of the sleeve 9, and the rotary transformer 6 is divided into two parts, a rotary transformer stator and a rotary transformer rotor, wherein the rotary transformer stator is fixedly connected to the cover 7, and the rotary transformer rotor is fixedly connected to the sleeve 9;

[0008] The shaft 11 is divided into an external spline section 11-1, a threaded section 11-2 and a clamping section 11-3; the external spline section 11-1 slides in the internal spline through hole of the sleeve 9; the threaded section 11-2 is connected to the central threaded inner hole of the nut cover 10; the extrusion tool 13 is installed on the clamping section 11-3 of the shaft 11 through a key 15 and a screw 17; a height-adjustable extrusion head 16 is installed at the front end of the extrusion tool 13;

[0009] The stator core 1, the permanent magnet 2 and the stator winding 3 constitute the motor stator, and the motor stator is fixed in the inner cylindrical inner hole of the housing 4; a plurality of inclined slots are evenly distributed in the radial direction of the stator core 1, and the permanent magnet 2 and the stator winding 3 are distributed in the radial inclined slots of the stator core 1; the motor rotor 5 is in the shape of an outwardly convex tooth and is concentrically installed in the core of the motor stator; the motor rotor 5 is fixed on the outside of the outer cylindrical surface of the sleeve 9.

[0010] A spiral extrusion device directly driven by an AC permanent magnet servo motor integrates a set of lead screw nut pairs, internal and external spline sliding pairs and an AC permanent magnet servo motor; an AC permanent magnet synchronous motor is used as a driving motor, and the motor rotor and the internal spline sleeve in the spline sliding pair are designed as one body. During the movement, the motor rotor drives the shaft to rotate circumferentially through the external spline section of the shaft, and the threaded section of the shaft realizes the linear feed movement of the shaft through the lead screw nut pair, so that the extrusion tool installed at the end of the shaft realizes the spiral feed movement, and the spiral feed extrusion speed and torque control of the end of the shaft can be realized by controlling the output of the AC permanent magnet synchronous motor. This device is a "zero transmission" direct drive device without intermediate transmission elements, and has outstanding advantages such as simple structure, high transmission efficiency and easy control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the overall structural diagram of the screw extrusion device directly driven by an AC permanent magnet servo motor.

[0012] Figure 2 for Figure 1 Axial half-section view.

[0013] Figure 3 for Figure 1 Radial half section view.

[0014] Figure 4 This is the outline drawing of the screw shaft.

[0015] Figure 5 for Figure 4 Left view of .

[0016] Figure 6 This is the installation diagram of the extrusion tool. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings.

[0018] A screw extrusion device directly driven by an AC permanent magnet servo motor comprises a stator core 1, a permanent magnet 2, a stator winding 3, a housing 4, a motor rotor 5, a rotary transformer 6, a cover 7, a sleeve 9, a nut cover 10, a shaft 11, and a bearing 12; the cover 7 and the nut cover 10 are respectively fixedly connected to both ends of the housing 4, and together with the housing 4 form a housing of the entire device;

[0019] The sleeve 9 is a spline through hole, and the center of the nut cover 10 has a threaded inner hole; the two ends of the sleeve 9 are supported in the inner holes of the two bearings 12; a rotary transformer 6 is arranged at one end of the sleeve 9, and the rotary transformer 6 is divided into two parts, a rotary transformer stator and a rotary transformer rotor, wherein the rotary transformer stator is fixedly connected to the cover 7, and the rotary transformer rotor is fixedly connected to the sleeve 9;

[0020] The shaft 11 is divided into an external spline section 11-1, a threaded section 11-2 and a clamping section 11-3; the external spline section 11-1 slides in the internal spline through hole of the sleeve 9; the threaded section 11-2 is connected to the central threaded inner hole of the nut cover 10; the extrusion tool 13 is installed on the clamping section 11-3 of the shaft 11 through a key 15 and a screw 17; a height-adjustable extrusion head 16 is installed at the front end of the extrusion tool 13;

[0021] The stator core 1, the permanent magnet 2 and the stator winding 3 constitute the motor stator, and the motor stator is fixed in the inner cylindrical inner hole of the housing 4; the stator core 1 has a plurality of evenly distributed radial inclined slots, and the permanent magnet 2 and the stator winding 3 are distributed in the radial inclined slots of the stator core 1; the motor rotor 5 is in the shape of an outwardly convex tooth, is installed concentrically with the motor stator, and is embedded in the core of the motor stator; the motor rotor 5 is fixed on the outside of the outer cylindrical surface of the sleeve 9.

[0022] The working principle of the present invention is as follows: a spiral extrusion device directly driven by an AC permanent magnet servo motor integrates a set of lead screw nut pairs, internal and external spline sliding pairs and an AC permanent magnet servo motor; an AC permanent magnet synchronous motor is used as a driving motor, and the motor rotor and the internal spline sleeve in the spline sliding pair are designed as a whole. During the movement, the motor rotor drives the shaft to rotate circumferentially through the external spline section of the shaft, and the threaded section of the shaft realizes the linear feed motion of the shaft through the lead screw nut pair, so that the extrusion tool installed at the end of the shaft realizes the spiral feed motion, and the spiral feed extrusion speed and torque control of the end of the shaft can be achieved by controlling the output of the AC permanent magnet synchronous motor.

[0023] Specific working process: when the motor is working, the motor rotor 5 drives the sleeve 9 to rotate circumferentially, the spline segment 11-1 of the shaft 11 is sleeved in the inner spline inner hole of the sleeve 9, and the threaded segment 11-2 of the shaft 11 is connected to the central threaded inner hole of the nut cover 10. The motor rotor 5 drives the sleeve 9 to rotate circumferentially. While the rotating sleeve 9 drives the shaft 11 to rotate, the nut cover 10 at the shaft end is fixed, causing the shaft 11 to slide in the inner spline hole of the sleeve 9, thereby enabling the extrusion tool installed at the end of the shaft to realize a spiral feed motion.

Claims

1. A spiral extrusion device directly driven by an AC permanent magnet servo motor, comprising a stator core (1), a permanent magnet (2), a stator winding (3), a housing (4), a motor rotor (5), a rotary transformer (6), a cover (7), a sleeve (9), a nut cover (10), a shaft (11), and a bearing (12); the cover (7) and the nut cover (10) are respectively fixedly connected to the two ends of the housing (4), and together with the housing (4) form the outer shell of the entire device; the sleeve (9) is a spline through hole, and the center of the nut cover (10) has a threaded inner hole; the two ends of the sleeve (9) are supported in the inner holes of two bearings (12); a rotary transformer (6) is arranged and installed at one end of the sleeve (9), and the rotary transformer (6) is divided into a rotary transformer and a rotary transformer. The shaft (11) is composed of a stator and a resolver rotor, wherein the resolver stator is fixedly connected to a cover (7), and the resolver rotor is fixedly connected to a sleeve (9); the shaft (11) is divided into an external spline section (11-1), a threaded section (11-2) and a clamping section (11-3); the external spline section (11-1) slides in an internal spline through hole of the sleeve (9); the threaded section (11-2) is connected to a central threaded inner hole of a nut cover (10); an extrusion tool (13) is mounted on the clamping section (11-3) of the shaft (11) via a key (15) and a screw (17); a height-adjustable extrusion head (16) is mounted at the front end of the extrusion tool (13); protrusions are arranged on the inward surfaces of the cover (7) and the nut cover (10), and the protrusions are arranged inside the housing; The stator core (1), the permanent magnet (2) and the stator winding (3) form a motor stator, and the motor stator is fixed in the inner cylindrical inner hole of the housing (4); a plurality of inclined slots are evenly distributed in the radial direction of the stator core (1), and the permanent magnet (2) and the stator winding (3) are distributed in the radial inclined slots of the stator core (1); the motor rotor (5) is in the shape of an externally convex tooth and is concentrically mounted on the core of the motor stator; the motor rotor (5) is fixed on the outer side of the outer cylindrical surface of the sleeve (9); When the motor is working, the motor rotor (5) drives the sleeve (9) to rotate in the circumferential direction, the spline section (11-1) of the shaft (11) is sleeved in the inner spline hole of the sleeve (9), and the threaded section (11-2) of the shaft (11) is connected to the central threaded inner hole of the nut cover (10). The motor rotor (5) drives the sleeve (9) to rotate in the circumferential direction. While the rotating sleeve (9) drives the shaft (11) to rotate, the nut cover (10) at the shaft end is fixed, causing the shaft (11) to slide in the inner spline hole of the sleeve (9), thereby enabling the extrusion tool installed at the end of the shaft to achieve a spiral feeding motion.

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