A device for applying radial prestress to gears based on electromagnetic force

Abstract

The present invention designs a radial prestress application device based on electromagnetic force. The device is symmetrically distributed around the center. Four hinge supports are installed on the upper, lower, left, and right surfaces of the central fixed block, and two mutually perpendicular annular fixators are installed on the front and rear surfaces; a grooved iron core for winding a wire is installed at the center of the annular fixator; the bottom ends of every two adjacent hydraulic rods are connected to the hinge supports on the central fixed block, and the top ends are connected to the hinge supports on the magnetic plate fixing plate. The adjacent two hydraulic rods are distributed in a "V" - shaped structure, with a total of 4 pairs; the circumferential magnetic plates are connected through the magnetic plate fixing plates, and tensile springs are installed at the head and tail of two adjacent magnetic plate fixing plates. By applying a certain amount of current to the wire on the iron core, a magnetic field is generated at both ends of the iron core. According to the magnetic principle of "like poles repel each other", the circumferential magnetic plates are evenly pushed outwards, and the magnetic plates are attached to the inner hole of the gear to be processed, so as to achieve the purpose of applying radial prestress in gear processing.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling equipment, and particularly relates to an expansion device for applying radial prestress to a gear based on electromagnetic force. Technical Background

[0002] As a key part for transmission in the industrial field, gears are widely used in fields such as aviation, automobiles, and construction machinery. These fields have relatively high requirements for the performance and precision of gears. Prestress processing, as a final processing method, has an important impact on the surface integrity of workpieces. Research shows that prestress processing can improve the surface residual stress state of workpieces, and it is easier to obtain a surface with a smaller roughness, thereby improving the surface accuracy of gears. For this reason, the present patent has invented a device for applying radial prestress to gears based on electromagnetic force, which can apply prestress conveniently and quickly, thereby improving the processing accuracy.

[0003] The existing expansion patent 201810300628.1 (manual tightening mechanism) mainly consists of a fixture body, an expansion stud, a limit pin, a pressure plate, a cover plate, a tightening slider, a set bolt, a positioning step, and a limit chute; by rotating the expansion stud and moving it downward to squeeze the tightening slider in the circumferential direction, the tightening purpose is achieved. However, this process requires applying mechanical force to the expansion stud to drive the tightening slider, which is inconvenient to operate.

[0004] The existing expansion patent 201210250896.X (an expansion fixture for cylinder liner processing) mainly consists of a metal cylinder, a piston rod, a cylinder liner, and a shaft; by pushing the piston rod, the expansion of the plastic material drives the expansion of the ultra-thin metal cylinder to achieve the purpose of expanding the circular inner cavity. However, this process still requires applying mechanical force to push the piston rod, which is inconvenient to operate.

[0005] Therefore, it is necessary to design a device that can apply prestress without manual application of mechanical force. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the existing technology and provide an expansion device for applying radial prestress to a gear based on electromagnetic force, which mainly consists of magnetic sheet a, wire, iron core, magnetic sheet fixing plate, hinge support, hydraulic rod, annular fixator, central fixing block, spring, magnetic sheet b, magnetic sheet c, and magnetic sheet d; the device is distributed in a central symmetry manner (as Figure 3 shown), and 4 hinge supports are installed on the upper, lower, left, and right surfaces of the central fixing block, and 2 annular fixators are installed on the front and rear surfaces (as Figure 5 shown); an iron core around which a wire is wound is installed at the center of the annular fixator (as Figure 4as shown in the figure); the bottom end of the hydraulic rod is connected to the hinge support on the central fixing block, and the top end is connected to the hinge support on the magnetic sheet fixing plate. Adjacent two hydraulic rods are distributed in a "V" - shaped structure, with a total of 4 pairs; the magnetic sheets around the circumference are connected through the magnetic sheet fixing plates, and springs are installed at the head and tail of adjacent two magnetic sheet fixing plates (as Figure 2 shown in the figure). The annular fixator and the hinge support are installed on the central fixing block through screws; both ends of the hydraulic rod are connected to the hinge support through bolts; a groove is opened on the end cylinder of the magnetic sheet fixing plate to limit the spring; the inner circular surface of magnetic sheet a and magnetic sheet d is the S - pole, and the outer circular surface is the N - pole; the inner circular surface of magnetic sheet b and magnetic sheet c is the N - pole, and the outer circular surface is the S - pole; the winding directions of the wires wound around the iron cores are the same, so as to generate a magnetic field that repels the corresponding magnetic sheets, so that the 4 magnetic sheets move outward in the radial direction to apply prestress to the gear.

[0007] Preferably: the hinge supports of the central fixing block and the magnetic sheet fixing plate connect two hydraulic rods, and every two hydraulic rods are distributed in a "V" - shaped structure (as Figure 3 shown in the figure). Under this overall distribution, the movement of the hydraulic rods can better maintain the stability of the workpiece; a groove is opened on the spring fixing column at the end of the magnetic sheet fixing plate, and the purpose of the groove is to limit the spring and stabilize the spring.

[0008] Preferably: two iron cores that are perpendicular to each other and centrosymmetric are grooved iron cores (as Figure 4 shown in the figure and as Figure 6 shown in the figure), so as to facilitate the neat layout of the wire winding without random movement of the wire, and it can ensure that the magnetic fields generated by the two iron cores after energization are exactly the same in magnitude, ensuring that the four magnetic sheets are equally and uniformly stressed; the circumferential surface of the grooved iron core is a cylindrical surface. When the grooved iron core cooperates with the annular fixator of the central fixing block (as Figure 4 shown in the figure), the grooved iron core can ensure stable cooperation with the inner circular surface of the annular fixator, and can prevent wire damage or wrinkling caused by friction or extrusion, which affects the use effect of the device.

[0009] Compared with the prior art, the principle of the present invention is: according to the magnetic effect of the current, the iron cores with wires on the central fixing block that are centrosymmetric (as Figure 4 shown in the figure) are energized to generate magnetic fields at both ends of the iron cores. Through the principle of "like poles repel each other", under the movement and stable effect of the hydraulic rods, four annular magnetic sheets are radially pushed to move (as Figure 2 shown in the figure), to produce the effect of prestress on the gear or the workpiece to be processed.

[0010] Compared with the prior art, the effects of the present invention are as follows: Four magnetic discs are adsorbed on the inner hole of the gear to be processed. By applying a certain magnitude of current to the wire, a magnetic field can be generated, thereby driving the four magnetic discs to apply prestress in the radial direction. This workpiece utilizes the principle of simple current magnetic effect, and the process operation is simple and easy to master. There is no need for manual mechanical force application, which saves costs and can effectively improve processing efficiency and provide relatively good precision for the processed workpiece. Description of the Drawings

[0011] Figure 1 Isometric schematic diagram of the overall structure of the present invention;

[0012] Figure 2 Installation schematic diagram of the magnetic disc fixing plate of the present invention;

[0013] Figure 3 Front view of the present invention;

[0014] Figure 4 Installation schematic diagram of the central fixing block and the annular fixator of the present invention;

[0015] Figure 5 Installation schematic diagram of the hinge support on the central fixing block of the present invention;

[0016] Figure 6 Schematic diagram of the helix direction of the spiral groove on the iron core of the present invention;

[0017] Figure 7 Partial schematic diagram of the spring fixing groove on the magnetic disc fixing plate of the present invention.

[0018] Description of the reference numerals in the drawings: 1 - Magnetic disc a; 2 - Wire; 3 - Iron core; 3A - Magnet spiral groove; 4 - Magnetic disc fixing plate; 4A - Spring fixing groove; 5 - Hinge support; 6 - Hydraulic rod; 7 - Annular fixator; 8 - Central fixing block; 9 - Spring; 10 - Magnetic disc b; 11 - Magnetic disc c; 12 - Magnetic disc d. Detailed Embodiment

[0019] The following further describes the present invention with reference to the drawings, so that those skilled in the art can implement it with reference to the description in the specification.

[0020] (As Figure 1 shown) What is described is a device for applying radial prestress to a gear based on electromagnetic force. The device is symmetrically distributed around the center as a whole, and there are four arc-shaped magnetic discs with exactly the same size and shape distributed circumferentially around it. A magnetic disc fixing plate (4) is provided between two adjacent magnetic discs, and springs (9) are installed at both ends of the magnetic disc fixing plate. The springs are limited according to the spring fixing column groove (4A) (as Figure 2 and Figure 7as shown); The center of the magnetic plate fixing plate is connected to the hinge support (5) on the center fixing block (8) in a "V" shape through the hydraulic rod (6). The center fixing block (8) is limited to the center position under the action of force balance and the connection between the hinge support (5) and the hydraulic rod (6) (as Figure 3 shown); Annular fixators (7) are installed on the front and back sides of the center fixing block (8), and the annular fixators (7) are stably and precisely fitted with the grooved iron core (3) (as Figure 4 shown). When the wire on the grooved iron core (3) is electrified, the device operates according to the principle of "like poles repel" and applies a certain prestress to the inner wall of the gear.

[0021] When prestress needs to be applied to the gear, the steps are as follows:

[0022] Step 1: Reasonably attach the workpiece to the inner wall of the gear or other expandable cylindrical bodies;

[0023] Step 2: Determine the direction of the energized current through the right-hand screw rule;

[0024] Step 3: Input current through the wire, and by adjusting the magnitude of the current, move the magnetic plate in the radial direction under the action of the hydraulic rod to complete the application of prestress;

[0025] Step 4: Adjust and reduce the magnitude of the current to reduce the magnetic field magnitude, and under the action of the head and tail springs of the magnetic plate fixing plate and the hydraulic rod, gradually move the magnetic plate in the radial direction towards the center to complete the unloading of prestress.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. At the same time, the scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A gear radial prestress application device based on electromagnetic force, mainly composed of magnetic sheet a (1), wire (2), iron core (3), magnetic sheet fixing plate (4), hinge support (5), hydraulic rod (6), annular fixator (7), central fixing block (8), spring (9), magnetic sheet b (10), magnetic sheet c (11), and magnetic sheet d (12); the side of the magnetic sheet fixing plate (4) in contact with the inner circular surface of the magnetic sheet is an arc surface for mating with the magnetic sheet. There are two identical spring fixing columns at the innermost side of the magnetic sheet fixing plate. The spring fixing columns have grooves, aiming to fix the spring (9), enabling the spring to better exert a certain force and limit the spring to achieve a more stable effect; when the device works, the spring is transformed into a tension spring to ensure that when unloading prestress, the tensile force of the spring can peel the four circumferential magnetic sheets from the inner hole of the gear. The other perpendicular side of the magnetic sheet fixing plate can play an insulating role, blocking the spring from being damaged to a certain extent due to magnetic interaction between the circumferential magnetic sheets; on the front and back surfaces of the central fixing block (8), annular fixators (7) are installed, and hinge supports (5) are installed on the upper, lower, left, and right four surfaces. Two hydraulic rods (6) are installed on the hinge supports (5), and they form a "V"-shaped angle. The hinge support (5) limits the hydraulic rod (6) unidirectionally, further ensuring that the hydraulic rods maintain a "V"-shaped structure, enabling the workpiece to maintain a certain stability during operation. Under the connection action between the hinge support and the hydraulic rod and the balanced force on the central fixing block, the central fixing block is limited to the central position; the hydraulic rod (6) can ensure that the four magnetic sheets are equally stressed, and the magnetic sheets move along the telescopic direction of the hydraulic rod with uniform stress to apply radial prestress to the inner hole of the gear. When the current action weakens or disappears, the magnetic sheets unload the force uniformly, and under the combined action of the magnetic sheet fixing plates, the magnetic sheets return to the initial stable state. The top of the hydraulic rod (6) is connected to the magnetic sheet fixing plate (4) through the hinge support (5). The central hole of the annular fixator (7) fixes the iron core (3), and the two iron cores are distributed at a right angle. The wire (2) for generating a magnetic field is wound around the iron core (3). The iron core has a helical groove along the axial direction, and the helical direction is right-handed; when a certain amount of current is passed through the helical wire under external conditions, the iron core and the wire will form an energized solenoid, thereby generating corresponding magnetic poles at both ends of the iron core. The prestress that is desired to be input can be adjusted by adjusting the magnitude of the input current; there are a total of 8 magnetic sheet fixing plates (4) in the whole circumferential direction; each two magnetic sheet fixing plates fix one magnetic sheet a (1), magnetic sheet b (10), magnetic sheet c (11), and magnetic sheet d (12). The four magnetic sheets are fan-shaped arcs, with the same size and shape, and are symmetrically distributed along the circumferential direction of the cylinder. The magnetic poles on the inner circular surface of magnetic sheet a and magnetic sheet d are S poles, and the outer circular surface is N pole. The magnetic poles on the inner circular surface of magnetic sheet b and magnetic sheet c are N poles, and the outer circular surface is S pole; under the action of the magnetic field force generated by the energized iron core, when the magnetic field force is large enough, under the action of the hydraulic rod (6), the magnetic sheets are uniformly pushed outward until they are close to the gear, and uniform radial prestress is applied here by controlling the magnitude of the input current;The two magnetic disk fixing plates are connected by a spring (9).;

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