Hopkinson bar high-speed cutting device based on electromagnetic driving

Abstract

The utility model provides a Hopkinson bar high-speed cutting device based on electromagnetic driving. The Hopkinson bar high-speed cutting device comprises a circuit assembly, an electromagnetic driving assembly, a guide positioning mechanism, a cutting mechanism and a buffer assembly, the circuit assembly is connected with the electromagnetic driving assembly; the electromagnetic driving assembly penetrates through the guiding and positioning mechanism through an incident rod to be connected with the cutting mechanism. The cutting mechanism is connected with the buffer assembly through the transmission rod, and the incident rod and the transmission rod are located on the same horizontal plane and arranged side by side. The embodiment of the utility model at least has the following beneficial effects: electromagnetic driving is adopted, the cutting speed is high, the cutting force is large, and the efficiency is high; different cutting speeds are obtained by adjusting the discharge energy of the input circuit, the function of adjusting the cutting speed is achieved, and the device is higher in adaptability and wider in application range.

Description

TECHNICAL FIELD

[0001] The utility model relates to material dynamic mechanical property experimental equipment field especially, it relates to a kind of high-speed cutting device of Hopkinson bar based on electromagnetic drive. BACKGROUND

[0002] Hopkinson bar is a kind of experimental device for studying material dynamic mechanical property, by high-pressure gas launch system, rod system, datum rail etc., rod system is by incident bar, projection bar and absorption bar, basic working principle is that high-pressure gas launch system provides a driving force, drives impact rod to hit incident bar, generates a high-speed stress wave, and propagates to test piece along incident bar, causes the high-speed deformation of test piece;According to the incident wave, reflected wave, transmission wave measured by the resistance strain gauge pasted on compression rod, and one-dimensional stress wave theory, the average strain rate, average strain and average stress etc.

[0003] High-speed cutting device based on Hopkinson bar is a kind of experimental device for realizing high-speed cutting using Hopkinson compression rod loading technology, when light air gun launches bullet to hit incident bar, incident bar obtains high-speed impact load and moves forward.Cutting mechanism moves with incident bar, and the cutter at the front end carries out high-speed cutting to workpiece.Cutting force and cutting heat etc.

[0004] The high-speed cutting device based on Hopkinson compression rod at present stage is mainly driven by gas, due to the compressibility and friction of gas and other factors, the precision is relatively low, although the speed of pneumatic system is fast, but the output power is small, it is difficult to meet the demand of high load and high-speed movement, the stability of gas drive is poor, and there can be fluctuation, due to the small air viscosity, lubrication is poor, need to set up separate lubricating device, increase the complexity and maintenance cost of system.At the same time, pneumatic system will produce larger noise during exhaust, and produce noise pollution. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model embodiment is to propose a kind of high-speed cutting device of Hopkinson bar based on electromagnetic drive, improve cutting efficiency, and make cutting speed adjustable.

[0006] One aspect of the utility model provides a kind of high-speed cutting device of Hopkinson bar based on electromagnetic drive, including circuit assembly, electromagnetic drive assembly, guiding and positioning mechanism, cutting mechanism and buffer assembly;

[0007] The circuit assembly is connected with the electromagnetic drive assembly;

[0008] The electromagnetic drive assembly is connected to the cutting mechanism via an incident rod passing through the guide positioning mechanism;

[0009] The cutting mechanism is connected to the buffer assembly via a transmission rod, and the incident rod and the transmission rod are on the same horizontal plane and placed side by side.

[0010] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the circuit components include a capacitor bank, a resistor, a freewheeling diode, a rectifier bridge, a voltmeter, an ammeter, and a switch. The freewheeling diode, the ammeter, the capacitor bank, and the rectifier bridge are connected in parallel in sequence. The switch is provided on one side between the capacitor bank and the ammeter, and the resistor is provided on one side between the voltmeter and the rectifier bridge. The rectifier bridge is connected to a transformer.

[0011] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the switch adopts a thyristor switch.

[0012] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the electromagnetic drive assembly is sequentially provided with a flat coil, a metal drive plate and the incident rod.

[0013] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the cutting mechanism includes a tool holder and a cutting tool. The tool holder includes a central hole in which a workpiece is placed. The two sides of the workpiece contact the incident rod and the transmission rod, respectively, and the cutting tool is positioned above the workpiece.

[0014] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the cutting mechanism is further provided with a positioning and clamping workpiece, which is connected to the tool holder to fix the tool.

[0015] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the guide positioning mechanism includes at least one first positioning device through which the incident bar passes.

[0016] According to the electromagnetically driven Hopkinson bar high-speed cutting device, a guide positioning mechanism is provided between the cutting mechanism and the buffer assembly. The guide positioning mechanism between the cutting mechanism and the buffer assembly includes at least one second positioning device, and the transmission rod passes through the second positioning device.

[0017] According to the electromagnetically driven Hopkinson bar high-speed cutting device, the buffer assembly adopts a cylinder seat.

[0018] The embodiments of this utility model have at least the following beneficial effects: using electromagnetic drive, the cutting speed is fast, the cutting force is large, and the efficiency is high; by adjusting the discharge energy of the input circuit, different cutting speeds can be obtained, realizing the function of adjustable cutting speed, making the device more adaptable and with a wider range of applications.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is an overall connection diagram of the device according to an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the circuit components according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the electromagnetic drive assembly according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the cutting mechanism according to an embodiment of the present invention. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In the following description, the use of suffixes such as "device," "module," "component," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no inherent meaning. Therefore, "module," "component," or "unit" can be used interchangeably. Terms such as "first," "second," etc., are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] Please refer to Figure 1It includes a circuit assembly 100, an electromagnetic drive assembly 200, a guide and positioning mechanism 300, a cutting mechanism 400, and a buffer assembly 500; the circuit assembly 100 is connected to the electromagnetic drive assembly 200; the electromagnetic drive assembly 200 is connected to the cutting mechanism 400 through the guide and positioning mechanism 300 via an incident rod 600; the cutting mechanism 400 is connected to the buffer assembly 500 via a transmission rod 700, and the incident rod 600 and the transmission rod 700 are on the same horizontal plane and placed side by side.

[0027] The guide positioning mechanism 300 includes at least one first positioning device 310, and the incident rod 600 passes through the first positioning device 320, wherein the first positioning device 310 and the second positioning device 320 are fixed to the frame.

[0028] Among them, a guide positioning mechanism 300 is provided between the cutting mechanism 400 and the buffer assembly 500. The guide positioning mechanism 300 provided between the cutting mechanism 400 and the buffer assembly 500 includes at least one second positioning device 320, and the transmission rod 700 passes through the second positioning device 320.

[0029] In some embodiments, reference Figure 2 The schematic diagram of the circuit assembly 100 shown includes a capacitor bank 110, a resistor 120, a freewheeling diode 130, a rectifier bridge 140, a voltmeter 150, an ammeter 160, and a switch 170. The freewheeling diode 130, the ammeter 150, the capacitor bank 110, and the rectifier bridge 140 are connected in parallel in sequence. A switch 170 is provided on one side between the capacitor bank 110 and the ammeter 150, and a resistor 120 is provided on one side between the voltmeter 150 and the rectifier bridge 140. A transformer 180 is connected to the rectifier bridge.

[0030] The circuit assembly 100 and the electromagnetic drive assembly 200 are connected via a freewheeling diode 130.

[0031] Switch 170 uses a thyristor switch.

[0032] The working principle of circuit component 100 is as follows: after the power is turned on, the capacitor group 110 connected in parallel in the circuit is charged. After the charging is completed, the capacitor begins to discharge, and a high-frequency AC pulse current is generated in the circuit. The current flows to the electromagnetic drive component 200.

[0033] In some embodiments, reference Figure 3The schematic diagram of the electromagnetic drive assembly 200 shown includes a flat coil 210, a metal drive plate 220, and an incident rod 600 arranged sequentially. The principle of the electromagnetic drive assembly 200 is that a high-frequency alternating pulse current flows into the flat coil 210, which generates an induced magnetic field. The metal drive plate 220 is located in the magnetic field and is magnetized, generating a magnetic field opposite to the original magnetic field. The interaction produces a huge force, and the metal drive plate 220 is ejected like a bullet and hits the incident rod 600, completing the electromagnetic drive process.

[0034] In some embodiments, reference Figure 4 A schematic diagram of the cutting mechanism 400 is shown. The cutting mechanism 400 includes a tool holder 410 and a cutting tool 420. The tool holder includes a central hole (not shown) in which a workpiece sample 430 is placed. The workpiece sample 430 includes a part 440 to be cut. The two sides of the workpiece sample 430 are in contact with the incident rod 600 and the transmission rod 700, respectively. The cutting tool 420 is disposed above the workpiece sample 430.

[0035] In some embodiments, the cutting mechanism 400 is further provided with a positioning and clamping workpiece (not shown), which is connected to the tool holder 410 to fix the tool 420.

[0036] The cutting mechanism 400 is mounted on the incident rod 600, such as... Figure 4 As shown, the upper part houses and fixes the cutting tool 420. Different sizes and specifications of cutting tools 420 can be accommodated to adapt to various cutting operations. The workpiece sample 430 contacts the incident rod 600. The lower part of the sample is a tool holder 410, used to fix the cutting tool 420 and position and clamp the workpiece. The end of the cutting mechanism 400 contacts the projection rod. When the incident rod 600 receives a high-speed impact load and moves forward, it pushes the workpiece sample 430 forward due to contact with it, bringing it into contact with the cutting tool 420. The cutting operation is completed under high-speed mutual motion. The end of the workpiece sample 430 contacts the projection rod for energy absorption, deceleration, and shock absorption, preventing damage to the workpiece sample 430 due to excessive speed.

[0037] The cutting edge of the tool 420 is set perpendicularly to the center line of the incident rod 600 in the cutting mechanism 400. By rotating the workpiece sample 430, the cutting of the part to be cut is completed quickly.

[0038] In some embodiments, a guide positioning mechanism 300 may be provided between the electromagnetic drive assembly 200 and the cutting mechanism 400, and between the cutting mechanism 400 and the buffer assembly 500. The guide positioning mechanism 300 allows the incident rod 600 and the transmission rod 700 to pass through a circular hole. The guide positioning mechanism 300 is used to support and fix the entire experimental device to ensure stability and accuracy during the experiment. The guide positioning mechanism 300 is fixed on the frame.

[0039] In some embodiments, the buffer assembly 500 is used to absorb energy in the system, is located at the end of the entire device, reduces workpiece speed and device vibration, is placed on the frame, and uses a cylinder seat to absorb energy and buffer.

[0040] The above description is merely a preferred embodiment of this utility model. This utility model is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model, as long as they achieve the same technical effects, should be included within the scope of protection of this utility model. Within the scope of protection of this utility model, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A high-speed cutting device based on an electromagnetically driven Hopkinson bar, characterized in that, Includes circuit components, electromagnetic drive components, guiding and positioning mechanisms, cutting mechanisms, and buffer components; The circuit assembly is connected to the electromagnetic drive assembly; The electromagnetic drive assembly is connected to the cutting mechanism via an incident rod passing through the guide positioning mechanism; The cutting mechanism is connected to the buffer assembly via a transmission rod, and the incident rod and the transmission rod are on the same horizontal plane and placed side by side.

2. The high-speed cutting device for a Hopkinson bar based on electromagnetic drive according to claim 1, characterized in that, The circuit assembly includes a capacitor bank, a resistor, a freewheeling diode, a rectifier bridge, a voltmeter, an ammeter, and a switch. The freewheeling diode, the ammeter, the capacitor bank, and the rectifier bridge are connected in parallel in sequence. The switch is located on one side between the capacitor bank and the ammeter, and the resistor is located on one side between the voltmeter and the rectifier bridge. The rectifier bridge is connected to a transformer.

3. The high-speed cutting device for a Hopkinson bar based on electromagnetic drive according to claim 2, characterized in that, The switch is a silicon controlled rectifier (SCR) switch.

4. The high-speed cutting device for Hopkinson bars based on electromagnetic drive according to claim 1, characterized in that, The electromagnetic drive assembly is sequentially provided with a flat coil, a metal drive plate, and the incident rod.

5. The high-speed cutting device for Hopkinson bars based on electromagnetic drive according to claim 1, characterized in that, The cutting mechanism includes a tool holder and a cutting tool. The tool holder includes a central hole in which a workpiece is placed. The two sides of the workpiece contact the incident rod and the transmission rod, respectively. The cutting tool is positioned above the workpiece.

6. The high-speed cutting device for a Hopkinson bar based on electromagnetic drive according to claim 5, characterized in that, The cutting mechanism is further provided with a positioning and clamping workpiece, which is connected to the tool holder to fix the tool.

7. The high-speed cutting device for Hopkinson bars based on electromagnetic drive according to claim 1, characterized in that, The guiding and positioning mechanism includes at least one first positioning device, through which the incident rod passes.

8. The high-speed cutting device for a Hopkinson bar based on electromagnetic drive according to claim 1, characterized in that, A guide positioning mechanism is provided between the cutting mechanism and the buffer assembly. The guide positioning mechanism between the cutting mechanism and the buffer assembly includes at least one second positioning device, and the transmission rod passes through the second positioning device.

9. The high-speed cutting device for a Hopkinson bar based on electromagnetic drive according to claim 1, characterized in that, The buffer assembly uses a cylinder base.

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