Impact toughness experimental device for pulsed magnetic field force loading

Abstract

The utility model provides an impact toughness experimental device for pulsed magnetic field force loading. The impact toughness experimental device comprises a combined unit assembly, an impact assembly, a flat coil assembly and a sample fixing assembly, each combined unit assembly comprises a supporting screw rod, an upper base plate, a middle base plate, a lower base plate, an upper shell plate, a middle shell protection sleeve, a right shell plate, a left shell plate, a front shell plate, a rear shell plate, a supporting column, a bolt and a nut. The impact assembly is arranged between the upper shell plate and the sample fixing assembly and comprises a guide sleeve, a driving plate, an insulating lining plate, a punch rod, a punch bolt, a V-shaped hammer head, a reset spring and an amplifier; the device adopts the pulsed magnetic field force as a power source, so that the experiment efficiency can be greatly improved, the device is small in size, flexible to operate, stable in test quality and high in efficiency, the test sample is impacted and loaded at a high speed, the experiment operation is simple and convenient, and semi-automatic and full-automatic operation is easier to realize.

Description

TECHNICAL FIELD

[0001] The utility model relates to material mechanics performance detection technical field, especially a kind of impact toughness experimental device of pulsed magnetic field force loading. BACKGROUND

[0002] Metal material requires sufficient toughness in addition to sufficient strength and plasticity in use process.Said toughness is the ability of material to absorb energy in the process of elastic deformation, plastic deformation and fracture.

[0003] Charpy impact test is to measure the toughness of material under impact load and multi-axial stress.Charpy impact test is to place sample with specified shape, size and notch type on sample support of impact testing machine, so that it is in simply supported beam state.Then specified height pendulum is used to hit sample once, and in essence, it is to measure the work absorbed by sample when it is broken under such impact through energy conversion process.

[0004] Pulsed magnetic field force is to form discharge loop by capacitor and control switch, and strong magnetic field is generated by working coil through transient current, and high-energy Lorentz force is generated on the surface of metal material by electromagnetic induction, and induced current and magnetic field are generated in metal workpiece.

[0005] Traditional charpy pendulum experiment uses kinetic energy generated by pendulum falling from high place to impact toughness test of sample, and the utility model is applied in impact toughness experimental field based on pulsed magnetic field force, and impact toughness experiment is carried out under electromagnetic force driving.Compared with traditional charpy pendulum experimental equipment, the utility model is more compact and simple. INVENTION CONTENTS

[0006] Therefore, the utility model aims at providing a kind of impact toughness experimental device of pulsed magnetic field force loading, to improve the problems, such as complex operation, large and heavy experimental equipment, low efficiency and difficult to realize automation in traditional material impact toughness experimental equipment.The source of impact force is improved, so that impact toughness test experimental operation is simple and fast, and the operation process of traditional equipment is improved, so that equipment operation is more convenient and fast, test efficiency is improved, and semi-automatic and automatic are facilitated.

[0007] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of impact toughness experimental device of pulsed magnetic field force loading, including combination unit component, impact subassembly, flat coil subassembly and sample fixed subassembly;The combination unit component includes support screw, upper seat plate, middle seat plate, lower seat plate, upper shell plate, middle shell protection sleeve, right shell plate, left shell plate, front shell plate, rear shell plate, support column, bolt and nut;The impact subassembly is arranged between the upper shell plate and sample fixed subassembly, and the impact subassembly includes guide sleeve, driving plate, insulating lining, punch rod, punch bolt, V-type hammer head, reset spring and amplifier;The flat coil subassembly is arranged between guide sleeve and insulating lining, and the flat coil subassembly includes flat coil framework and flat coil;The sample fixed subassembly is located lower seat plate, and the sample fixed subassembly includes advancing screw rod, advancing clamping plate, test support block and sample.

[0008] In a preferred embodiment, the left shell plate, right shell plate, upper seat plate and lower seat plate are integrally formed, and the left shell plate and right shell plate are provided with slot holes, and the middle seat plate is placed on the left shell plate and right shell plate through the slot holes.

[0009] In a preferred embodiment, the impact subassembly includes a guide sleeve fixed to the lower surface of the upper shell plate, the guide sleeve is connected to the upper shell plate through a support bolt, and the lower surface of the guide sleeve is connected to the lower seat plate;The lower seat plate is provided with a through hole in the center, and the guide sleeve is aligned with the edge of the through hole.

[0010] In a preferred embodiment, the flat coil subassembly is fixed in the guide sleeve, and the guide sleeve is provided with a slot on one side, so that the side of the flat coil subassembly connected to the external circuit can be placed in the guide sleeve.

[0011] The middle shell protection sleeve is located below the guide sleeve and above the upper seat plate;The middle shell protection sleeve is provided with a through hole for connecting the lead of the flat coil subassembly to the external circuit.

[0012] In a preferred embodiment, the impact subassembly includes the guide sleeve, and the flat coil subassembly is provided with a driving plate and an insulating lining that can move up and down along the inner wall of the guide sleeve, the lower surface of the insulating lining is fixedly connected to an amplifier, the lower end of the amplifier is fixedly connected to a punch rod, the V-shaped hammer head is fixed to the punch bolt below the punch rod, and the impact subassembly and the flat coil subassembly are located on the same central axis.

[0013] The driving plate is made of red copper, and the amplifier is a conical column with a large upper part and a small lower part, and the part close to the driving plate is large, and the part connected to the punch rod is small.

[0014] In a preferred embodiment, the flat coil assembly is composed of a flat coil skeleton and a flat coil, the flat coil skeleton is processed by epoxy resin, the flat coil is wound on the flat coil skeleton by copper wire and embedded into the flat coil skeleton, so that the turns of the outermost circle of the copper wire can tightly adhere to the outer wall of the bakelite skeleton.

[0015] In a preferred embodiment, the copper wire is made of red copper tape, and the red copper tape is wrapped with high-voltage-resistant insulating tape to realize electrical insulation between turns, the flat coil assembly converts electrical energy into impact force of the impact assembly, and the flat coil circuit is connected with an external circuit.

[0016] The flat coil assembly is placed on an insulating lining plate, and the insulating lining plate is made of rubber or other insulating materials.

[0017] In a preferred embodiment, the lower seat plate is fixed with a sample fixing assembly, and a sliding groove is formed, and two side pushing clamps are placed in the sliding groove, the left shell plate and the right shell plate are respectively provided with threaded holes, and the two side pushing screws are respectively fixed to the left shell plate and the right shell plate, and the sample support block is placed on the pushing clamp, and the sample support block is provided with a notch for preventing the sample.

[0018] A laser speedometer is fixed on the lower seat plate for measuring the speed of the V-shaped hammer head after impact.

[0019] In a preferred embodiment, the guide sleeve and the amplifier are above the upper seat plate, the middle seat plate is provided with a through hole in the center, the oil-free lubricating sleeve is placed in the through hole in the center of the middle seat plate, the punch rod passes through the oil-free lubricating sleeve and the middle seat plate, the return spring is above the oil-free lubricating sleeve and coincides with the axis thereof, the punch rod passes through the return spring, the return spring can reset the impact assembly after each discharge, and can also serve as a buffer between the middle die plate and the impact unit to prevent the amplifier from colliding with the middle die plate.

[0020] In a preferred embodiment, the support column is fixed to the lower seat plate by bolts, and the support column has four support columns respectively located at four corners of the lower seat plate; and the telescopic support arm is fixed to the upper seat plate.

[0021] Compared with the prior art, the utility model has the advantages that: the utility model provides a kind of impact toughness experimental device of pulsed magnetic field force loading, the power system of this device uses pulsed magnetic field force, and impact component is utilized to plate coil assembly, and the impact force of impact sample is converted from electric energy, and it is the same with the principle of electromagnetic forming in high energy rate forming, belongs to impact loading, and loading rate is very high, and test fracture time is extremely short, generally in microsecond level;And with the aid of electromagnetic force loading can be different sample and provide different impact energy and adjust, realize the accurate variable control of impact energy;Compared with the movement form of charpy pendulum impact testing machine free fall, the power source of this device using pulsed magnetic field force can greatly improve experimental efficiency, and the device volume is small, and operation is flexible, and high speed rate impact loading sample, and repeatability is good, and test quality is stable, and efficiency is high, and it is simple to experiment operation, and semi-automatic and full-automatic operation are also easier to realize.Therefore, the utility model has very strong practicality and broad application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the main view cross section structure schematic diagram of the device part of the utility model;

[0023] Figure 2 It is the three-dimensional structure schematic diagram of the device of the utility model;

[0024] Figure 3 It is the plate coil assembly structure and impact component assembly schematic diagram of the device of the utility model;

[0025] Figure 4 It is the sample fixed component assembly schematic diagram of the device of the utility model;

[0026] Figure 5 It is the plate coil assembly assembly schematic diagram of the device of the utility model;

[0027] Figure 6 It is the control circuit block diagram of the device of the utility model;

[0028] In the figure:

[0029] 1-supporting screw rod;2-guide sleeve;3-flat coil skeleton;4-flat coil;5-driving plate;6-middle shell protection sleeve;7-punch rod;8-upper seat plate;9-punch bolt;10-middle seat plate;11-right shell plate;12-propelling screw rod;13-supporting column;14-sample;15-V-shaped hammer head;16-sample supporting block;17-lower seat plate;18-propelling clamping plate;19-left shell plate;20-oil-free lubricating sleeve;21-sleeve bolt;22-return spring;23-amplifier;24-insulating lining plate;25-upper shell plate;26-telescopic supporting arm;27-operation panel;28-laser speedometer. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] like Figures 1-6 As shown, this embodiment provides an impact toughness testing device under pulsed magnetic field loading, including a combined unit assembly, an impact assembly, a flat coil assembly, a sample fixing assembly, and a control system assembly. The combined unit includes a support screw 1, an upper base plate 8, a middle base plate 10, a lower base plate 17, an upper shell plate 25, a middle shell protective sleeve 6, a right shell plate 11, a left shell plate 19, a support column 13, bolts, and nuts, connecting the various units into an organic whole to smoothly and reliably complete the testing process. The impact assembly is located between the upper shell plate 25 and the sample fixing assembly. The system includes a guide sleeve 2, a drive plate 5, an insulating liner 24, a punch rod 7, a punch bolt 9, a V-shaped hammer 15, a return spring 22, and an amplifier 23; the flat coil assembly is located between the guide sleeve 2 and the insulating liner 24, and the flat coil assembly includes a flat coil frame 3 and a flat coil 4; the sample fixing assembly is located on the lower seat plate 17, and the sample fixing assembly includes a push screw 12, a push clamp 18, a test support block 16, and a sample 14; the control system assembly includes an operation panel 27, a telescopic support arm 26, a laser velocimeter 28, and a discharge system.

[0034] In this embodiment, the left shell plate 19, right shell plate 11, upper seat plate 8, and lower seat plate 17 are integrally formed. The left shell plate 19 and right shell plate 11 have slots, and the middle seat plate 10 passes through these slots and is placed on the left shell plate 19 and right shell plate 11. The guide sleeve 2 is connected to the upper shell plate 25 via a support bolt 1, and the lower surface of the guide sleeve 2 is connected to the lower seat plate 8. The middle shell protective sleeve 6 is located below the guide sleeve 2 and above the upper seat plate 8. The middle shell protective sleeve 6 has a through hole for connecting the flat coil assembly wires to the external circuit. The impact assembly includes the guide sleeve 2. Below the flat coil assembly is a drive plate 5 that can move up and down along the inner wall of the guide sleeve 2, and an insulating liner 24. An amplifier 23 is fixedly connected to the lower surface of the insulating liner 24. Sleeve 2 and amplifier 23 are located above upper base plate 8. The middle base plate 10 has a through hole in its center. The oil-free lubricating sleeve 20 is placed in the through hole in the center of the middle base plate 10. The punch rod 7 passes through the oil-free lubricating sleeve 20 and the middle base plate 10. The reset spring position 22 is located above the oil-free lubricating sleeve 20 and coincides with its axis. The punch rod 7 passes through the reset spring 22. The reset spring 22 can reset the impact assembly after each discharge and also acts as a buffer between the middle base plate 10 and the impact unit to prevent the amplifier 23 from colliding with the middle base plate 10. The telescopic support arm 26 is fixed to upper base plate 8. The operation panel 27 is fixed to the end of the telescopic support arm 26. The discharge system and laser tester 28 are respectively connected to the operation panel 27 for control.

[0035] like Figure 3 As shown, in this embodiment, the drive plate 5 is made of copper, and the amplifier 23 is a conical cylinder with a larger top and a smaller bottom, with the larger side near the drive plate 5 and the smaller side at the connection with the punch rod 7; the lower end of the amplifier 23 is fixedly connected to the punch rod 7, and a V-shaped hammer head 15 is fixedly connected to the lower part of the punch rod 7 by a punch bolt 9; the impact assembly and the flat coil assembly are both located on the same central axis.

[0036] like Figure 4 As shown, in this embodiment, the lower base plate has a through hole in its center, and the guide sleeve is aligned with the edge of the through hole; the flat coil assembly is fixed inside the guide sleeve, and a slot is opened on one side of the guide sleeve so that the side of the flat coil assembly connected to the external circuit can be placed in the guide sleeve; a sample fixing assembly is fixedly connected to the lower base plate, and a sliding groove is opened therein, with the two side push clamps respectively placed in the sliding groove; the left shell plate and the right shell plate are respectively opened with threaded holes, and the two side push screws are respectively fixed to the left shell plate and the right shell plate; the sample support block is placed on the push clamp, and the sample support block has a slot to prevent the sample from being impacted; a laser velocimeter is fixed to the lower base plate to measure the speed after the V-shaped hammer impact is completed; the support columns are fixed to the lower base plate by bolts, and there are four support columns located at the four corners of the lower base plate.

[0037] As Figure 5 shown in the embodiment, the flat coil assembly is composed of a flat coil skeleton and a flat coil, the flat coil skeleton is processed from epoxy resin, the flat coil is wound around the flat coil skeleton from copper wires and embedded into the flat coil skeleton, so that the turns of the outermost circle of the copper wires can tightly adhere to the outer wall of the bakelite skeleton;

[0038] Further, the impact toughness test experiment process is as follows: the prepared sample is placed on the sample support platform, then the advancing screw and the advancing clamping plate are adjusted so that the sample is placed on the central axis; the charging switch is closed through the operation panel to connect the charging circuit composed of the rectifier A, the current limiting resistor R and the capacitor bank C; the 380V power supply charges the capacitor bank C through the charging circuit, when the charging is completed, the charging switch is disconnected through the operation panel to cut off the charging circuit; then the high-voltage pulse generator is controlled to generate a high-voltage pulse through the operation panel to trigger the high-frequency thyristor discharge switch to conduct the discharge circuit composed of the capacitor bank C and the flat coil assembly; since the capacitor bank C and the coil constitute a typical RLC circuit, the discharge current through the flat coil has a decay oscillation characteristic, according to the electromagnetic induction law, the current generates an induced current in the high-conductivity driving piece adjacent thereto, and the latter generates an induced magnetic field; thus, the coil current magnetic field and the induced current magnetic field generate superposition in the gap between the flat coil assembly and the driving disc to enhance; the enhanced magnetic field and the driving piece induced current act on the driving piece to make it bear an axial downward pulse load, and after the amplification of the amplifier, the punch rod and the V-shaped hammer head act on the sample to realize the experiment process of the impact toughness experiment.

[0039] The working process of the impact toughness experiment device with pulse magnetic field force loading provided in the embodiment is as follows:

[0040] Step 1: cut the material to be tested for impact toughness into a suitable size and process a U-shaped notch or a V-shaped notch.

[0041] Step 2: place the processed sample in the groove of the sample support block, adjust the advancing bolt so that the notch of the sample is located on the central axis of the impact assembly.

[0042] Step 3: start the discharge control system to charge the capacitor and store electrical energy in the capacitor; then, close the discharge switch, the electrical energy stored in the capacitor generates a pulse current in the coil in a very short time through the discharge circuit, so that the coil forms a changing magnetic field, according to the electromagnetic induction law, an induced eddy current is excited in the driving piece, the current direction in the coil is opposite to that of the induced eddy current in the driving piece, the magnetic fields generated by the two interact to produce a strong electromagnetic force, under the repulsion of the magnetic field, the driving piece moves downward to drive the amplifier, the punch and the V-shaped hammer head, thereby achieving the impact on the sample and making the test break.

[0043] Step 4: after the discharge is completed, the discharge control system is closed, the sample is removed, and the impact absorption work size is calculated.

[0044] Step 5: regarding the calculation of the impact absorption work, the change of the inductance in the discharge process is ignored, an equation is established according to the energy conservation principle, and the energy change relationship of the discharge process is deduced.

[0045] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technology content to equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments made without departing from the technical solution of the present application, according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A device for impact toughness testing under pulsed magnetic field force loading, characterized in that, The utility model discloses a combination unit assembly, impact assembly, flat coil assembly and sample fixing assembly, the combination unit assembly includes support screw rod, upper seat plate, middle seat plate, lower seat plate, upper shell plate, middle shell protective sleeve, right shell plate, left shell plate, front shell plate, rear shell plate, support column, bolt and nut, the impact assembly is arranged between the upper shell plate and sample fixing assembly, and the impact assembly includes guide sleeve, drive plate, insulating lining, punch rod, punch bolt, V type hammer head, reset spring and amplifier, the flat coil assembly is arranged between guide sleeve and insulating lining, and the flat coil assembly includes flat coil framework and flat coil, the sample fixing assembly is located lower seat plate, and the sample fixing assembly includes advance screw rod, advance clamping plate, test support block and sample.

2. The impact toughness testing device of claim 1, wherein, The left shell plate, right shell plate, upper seat plate and lower seat plate are integrally formed, and the left shell plate and right shell plate are provided with slot holes, and the middle seat plate is placed on the left shell plate and right shell plate through the slot holes.

3. The impact toughness testing device of claim 1, wherein, The impact assembly includes the guide sleeve fixed to the lower surface of the upper shell plate, the guide sleeve is connected with the upper shell plate through the support bolt, and the lower surface of the guide sleeve is connected with the lower seat plate, the lower seat plate is provided with a through hole in the center, and the guide sleeve is aligned with the edge of the through hole.

4. The impact toughness testing apparatus of claim 1, wherein, The flat coil assembly is fixed in the guide sleeve, and the guide sleeve is provided with a slot on one side, so that the side of the flat coil assembly connected with the external circuit can be placed in the guide sleeve. The middle shell protective sleeve is located below the guide sleeve and above the upper seat plate, and the middle shell protective sleeve is provided with a through hole for connecting the lead of the flat coil assembly with the external circuit.

5. The apparatus of claim 1, wherein the pulsed magnetic field force loading is applied to the sample by a plurality of coils. The impact assembly includes the guide sleeve, and the flat coil assembly is provided with the drive plate and insulating lining which can move up and down along the inner wall of the guide sleeve, the lower surface of the insulating lining is fixedly connected with the amplifier, the lower end of the amplifier is fixedly connected with the punch rod, the V type hammer head is fixedly connected with the punch bolt below the punch rod, and the impact assembly and the flat coil assembly are located on the same central axis. The drive plate is made of red copper, the amplifier is a conical column type with large upper part and small lower part, and the large part is close to the drive plate and connected with the punch rod.

6. The apparatus of claim 1, wherein the pulsed magnetic field force loading is applied to the sample by a plurality of coils. The flat coil assembly is composed of the flat coil framework and flat coil, the flat coil framework is processed by epoxy resin, the flat coil is wound on the flat coil framework by copper lead and embedded in the flat coil framework, so that the turns of the outermost circle of the copper lead can tightly adhere to the outer wall of the bakelite framework.

7. The apparatus of claim 6, wherein the magnetic field is pulsed. The copper lead is made of red copper tape, and the red copper tape is wrapped with high-voltage-resistant insulating tape to realize electrical insulation between turns, the flat coil assembly converts electric energy into impact force of the impact assembly, and the flat coil circuit is connected with the external circuit. The flat coil assembly is provided with the insulating lining, and the insulating lining is made of rubber or other insulating materials.

8. The apparatus of claim 1, wherein the apparatus is configured to apply a magnetic field pulse to the sample. The lower seat plate is fixedly connected with the sample fixing assembly and is provided with a sliding groove, the two side advance clamping plates are respectively placed in the sliding groove, the left shell plate and right shell plate are respectively provided with threaded holes, the two side advance screw rods are respectively fixedly connected with the left shell plate and right shell plate, and the test support block is placed on the advance clamping plate and is provided with a slot for preventing the sample. The laser speed tester is fixed on the lower seat plate and used for measuring the speed after the V-shaped hammer head impacts.

9. The apparatus of claim 1, wherein the apparatus is configured to apply a magnetic field pulse to the sample. The guide sleeve and the amplifier are above the upper seat plate, the middle seat plate is provided with a through hole in the center, the oil-free lubricating sleeve is placed in the through hole of the middle seat plate, the punch rod passes through the oil-free lubricating sleeve and the middle seat plate, the reset spring is above the oil-free lubricating sleeve and coincides with the axis of the oil-free lubricating sleeve, the punch rod passes through the reset spring, the reset spring can reset the impact assembly after each power release and can also buffer between the middle die seat plate and the impact unit to prevent the amplifier from colliding with the middle die seat plate.

10. The apparatus of claim 1, wherein the apparatus is configured to apply a magnetic field pulse to the sample. The support columns are fixed on the lower seat plate by bolts, and the four support columns are respectively located at the four corners of the lower seat plate; the telescopic support arm is fixed on the upper seat plate, and the operation panel is fixed on the end of the telescopic support arm.

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