SU989449A1

SU989449A1 - Device for checking article mechanical properties

Info

Publication number: SU989449A1
Application number: SU792856121A
Authority: SU
Inventors: Валерий Борисович Кратиров; Михаил Александрович Мельгуй; Анатолий Иванович Филиппов
Original assignee: Отдел Физики Неразрушающего Контроля Ан Бсср
Priority date: 1979-12-14
Filing date: 1979-12-14
Publication date: 1983-01-15

Description

Изобретение относится к неразрушающим методам контроля и может быть использовано для контроля механических свойств изделий их ферромагнитных материалов магнитным методом путем измерения остаточной напряженности ⁵магнитного поля в любых отраслях народного хозяйства.The invention relates to non-destructive testing methods and can be used to control the mechanical properties of products of their ferromagnetic materials by the magnetic method by measuring the residual magnetic field strength ⁵ in any sectors of the national economy.

Известно устройство для контроля механических свойств ферромагнитных изделий, содержащее последовательно соединенные блок намагничивания в виде программного генератора импульсов тока, преобразователь, измерительный блок и индикатор [1].A device for monitoring the mechanical properties of ferromagnetic products, containing a series-connected magnetization unit in the form of a software current pulse generator, a converter, a measuring unit and an indicator [1].

Недостатки этого устройства - малый диапазон толщин контролируемых изделий, низкие стабильность и надежность контроля.The disadvantages of this device are the small thickness range of the controlled products, low stability and reliability of control.

Наиболее близким к изобретению го по технической сущности является устройство для контроля механических свойств изделий, содержащее последовательно соединенные блок намагни2 чивания, преобразователь, блок измерения градиента поля и индикатор С 2 ].Closest to the invention of the technical essence is a device for monitoring the mechanical properties of products, containing serially connected magnetization unit 2, a converter, a field gradient measuring unit, and an indicator C 2].

Недостатком данного устройства является также малый диапазон толщин контролируемых изделий. Увеличение амплитуды импульсов намагничивающего тока вызывает увеличение габаритов, потребляемой мощности прибора и снижает стабильность контроля.The disadvantage of this device is also the small thickness range of the controlled products. An increase in the amplitude of the magnetizing current pulses causes an increase in the size and power consumption of the device and reduces the stability of control.

Цель изобретения - расширение диапазона толщин контролируемых изделий и повышение достоверности контроля.The purpose of the invention is to expand the range of thicknesses of controlled products and increase the reliability of control.

Цель достигается тем, что устройство снабжено блоком запоминания, схемой сравнения и измерителем амплитуды импульсов, входы которого соединены с выходами схемы сравнения и блока намагничивания, входы блока запоминания и схемы сравнения соединены с выходом блока измерения, а второй выход схемы сравнения подключен к входу блока намагничивания.The goal is achieved in that the device is equipped with a storage unit, a comparison circuit and a pulse amplitude meter, the inputs of which are connected to the outputs of the comparison circuit and the magnetization unit, the inputs of the storage unit and the comparison circuit are connected to the output of the measurement unit, and the second output of the comparison circuit is connected to the input of the magnetization unit .

На фиг.1 приведена структурная схема устройства; на фиг.2 - форма пачек импульсов, вырабатываемых управляемым генератором.Figure 1 shows the structural diagram of the device; figure 2 - the shape of the bursts of pulses generated by a controlled generator.

Устройство состоит из блока 1 намагничивания, преобразователя 2, блока 3.измерения, индикатора 4, последовательно соединенных блока 5 запоминания, схемы 6 сравнения и измерителя 7 амплитуды импульсов. Блок 5 запоминания, схема 6 сравнения, блок 1 намагничивания, преобразователь 2, блок измерения 3 и , индикатор 4 соединены между собой последовательно.The device consists of a magnetization unit 1, a converter 2, a measurement unit 3., an indicator 4, series-connected memory unit 5, a comparison circuit 6 and a pulse amplitude meter 7. The storage unit 5, the comparison circuit 6, the magnetization unit 1, the transducer 2, the measurement unit 3 and, the indicator 4 are interconnected in series.

Вход блока 5 запоминания и второй вход схемы 6 сравнения соединены с выходом блока 3 измерения. Входы измерителя 7 амплитуды импульсов соединены с выходом схемы 6 сравнения и выходом блока 1 намагничивания.The input of the storage unit 5 and the second input of the comparison circuit 6 are connected to the output of the measurement unit 3. The inputs of the meter 7 of the pulse amplitude are connected to the output of the comparison circuit 6 and the output of the magnetization unit 1.

Устройство работает следующим образом.The device operates as follows.

Преобразователь 2 устанавливают на поверхность контролируемого из де” Лия. Включают.устройство. Импульсы тока, проходя по обмотке соленоида преобразователя 2, создают на торце соленоида импульсы магнитного поля, которыми намагничивается контролируемый участок изделия. Импульсы тока, которые проходят по соленоиду преобразователя 2, вначале возрастают по амплитуде, а затем убывают до нуля (пачка импульсов), как представлено на фиг.2. Такая форма пачки импульсов обеспечивается управляемым генератором пачек импульсов блока намагничивания. Считываемый сигнал с преобразователя 2 поступает на блок 3 измерения, где он усиливает-, ся, детектируется и поступает на индикатор 4. Одновременно после каждого импульса тока сигнал с выхода блока 3 измерения поступает на входы блока 5 запоминания и схемы 6 сравнения. В блоке 5 запоминания происходит запоминание сигнала на время интервала между импульсами тока, а в схеме 6 сравнения происходит сравнение сигналов предыдущего измерения с последующим, При выполнении усг . _ия 3^ост^7/ ^Ηοοτη+ι^Α⁶ остп результат предыдущего измерения, а ' vH_0CTn-H~ последующего, срабатывает схема 6 сравнения и выдает -сигнал на измеритель 7 амплитуды импульсов, гдеThe Converter 2 is installed on the surface of the controlled from de ”Liya. Include. Device. The current pulses passing through the winding of the solenoid of the transducer 2 create magnetic field pulses at the end of the solenoid, which magnetize the controlled section of the product. The current pulses that pass through the solenoid of the transducer 2, first increase in amplitude, and then decrease to zero (burst of pulses), as shown in figure 2. This shape of the pulse train is provided by a controlled pulse train generator of the magnetization unit. The read signal from the transducer 2 enters the measurement unit 3, where it is amplified, detected, and fed to the indicator 4. Simultaneously after each current pulse, the signal from the output of the measurement unit 3 is fed to the inputs of the storage unit 5 and comparison circuit 6. In block 5 of the memorization, the signal is memorized for the duration of the interval between current pulses, and in the comparison circuit 6, the signals of the previous measurement are compared with the following. _iya 3 ^ ost ^{7 /} ^ Ηοοτη + ι ^ Α ⁶ ostp the result of the previous measurement, and 'vH _0CTn -H ~ the next, the comparison circuit 6 is triggered and gives a signal to the pulse amplitude meter 7, where

989449 4 происходит регистрация амплитуды импульсов намагничивающего тока. В это же время сигнал с выхода схемы 6 сравнения поступает на вход блока 1 5 намагничивания. С этого момента генератор пачек импульсов блока 1 намагничивания начинает генерировать импульсы тока с убывающей амплитудой. После окончания намагничивания 10 индикатор 4 регистрирует величину остаточной намагниченности. По величине остаточной намагниченности и максимальной амплитуде намагничивающего тока судят о механических 15 свойствах изделия из ферромагнитного материала;989449 4 the amplitude of the magnetizing current pulses is recorded. At the same time, the signal from the output of the comparison circuit 6 is supplied to the input of the magnetization unit 1 5. From this moment, the generator of the bursts of pulses of the magnetization unit 1 begins to generate current pulses with decreasing amplitude. After the magnetization 10, the indicator 4 registers the value of the residual magnetization. The magnitude of the residual magnetization and the maximum amplitude of the magnetizing current are judged on the mechanical 15 properties of the product from a ferromagnetic material;

Устройство позволяет расширить диапазон толщин контролируемых изделий путем выбора оптимальной величины 20<амплитуды намагничивающего тока. Оптимальная величина амплитуды намагничивающего тока выбирается из условия получения максимального градиента остаточной намагниченности. Выбор 25 режима намагничивания от изделия к изделию позволяет также повысить достоверность контроля изделий при изменяющемся ассортименте изделий.The device allows you to expand the thickness range of the controlled products by selecting the optimal value of 20 <the amplitude of the magnetizing current. The optimal magnitude of the amplitude of the magnetizing current is selected from the condition for obtaining the maximum gradient of the residual magnetization. The choice of 25 modes of magnetization from product to product also allows you to increase the reliability of product control with a changing assortment of products.

Claims

(5) DEVICE FOR CONTROL OF MECHANICAL PROPERTIES OF PRODUCTS The invention relates to nondestructive control methods and can be used to control the mechanical properties of ferromagnetic materials of their products by a magnetic method by measuring the residual magnetic field strength in any national economy. A device for controlling the mechanical properties of ferromagnetic products is known, which contains series-connected magnetization unit in the form of a programmable current pulse generator, a converter, a measuring unit and an indicator 1} The disadvantages of this device are a small range of thickness of the products being monitored, low stability and reliability of the control. Closest to the invention to the technical essence is a device for controlling the mechanical properties of products, comprising a series-connected magnetization unit, a transducer, a field gradient measurement unit and an indicator C 2. The disadvantage of this device is also a small range of thicknesses of controlled products. An increase in the amplitude of the magnetizing current pulses causes an increase in the size, power consumption of the device and reduces the stability of the control. The purpose of the invention is to expand the range of the thickness of the controlled products and increase the reliability of the control. The goal is achieved in that the device is equipped with a memory blob, a comparison circuit and an amp / m pulse meter, the inputs of which are connected to the outputs of the comparison circuit and the magnetization unit, the inputs of the memory unit and the comparison circuit are connected to the output of the measurement unit, and the second output of the comparison circuit is connected to the input magnetization unit. 9 Fig, 1 shows a block diagram of the device; Fig. 2 shows the shape of the bursts of pulses produced by a controlled generator. The device consists of magnetization unit 1, transducer 2, measurement unit 3, indicator i, memory unit 5 connected in series, comparison circuit 6 and pulse amplitude meter 7. The memory unit 5, the comparison circuit 6, the magnetization unit 1, the transducer 2, the measurement unit 3 and the indicator 4 are interconnected in series. The input of the storage unit 5 and the second input of the comparison circuit 6 are connected to the output of the measurement unit 3. The inputs of the meter 7 pulse amplitude are connected to the output of the comparison circuit b and the output of the magnetization unit 1. The device works as follows. Converter 2 is installed on the surface of the controlled product Lee. Include device. The current pulses, the passage through the winding of the solenoid converter 2, create magnetic field pulses at the end of the solenoid, which magnetize the controlled area of the product. The current pulses, which pass through the transducer 2 solenoid, first increase in amplitude and then decrease to zero (burst), as shown in Fig. 2. Such a pulse burst form is provided by a controlled pulse generator of the magnetizing unit. The read signal from converter 2 is fed to measurement unit 3, where it is amplified, detected and fed to the indicator. Simultaneously after each current pulse, the signal from the output of measurement unit 3 is fed to the inputs of memory unit 5 and comparison circuit 6. In memory block 5, the signal is memorized for the time interval between current pulses, and in comparison circuit 6, the previous measurement signals are compared with the following. When performing Noi Nost1 De VH, and the result of the previous measurement, and the next OST-n, the comparison circuit 6 operates and gives -the signal 7 pulse amplitude meter, r 4 the amplitude of the magnetizing current pulses is recorded. At this time, the signal from the output of the comparison circuit 6 is fed to the input of the magnetization unit 1. From this moment on, the generator of the pulse bursts of the magnetization unit 1 begins to generate current pulses with a decreasing amplitude. After the end of magnetization, the indicator k registers the magnitude of the residual magnetization. According to the magnitude of the residual magnetization and the maximum amplitude of the magnetizing current, the mechanical properties of the product made of a ferromagnetic material are judged; The device allows to expand the range of thicknesses of the tested products by choosing the optimal magnitude of the magnitude of the magnetizing current. The optimum magnitude of the magnetization of its current is chosen from the condition of obtaining the maximum residual magnetization gradient. The selection of the magnetizing mode from product to product also makes it possible to increase the reliability of control of products with a varying range of products. Apparatus for controlling mechanical properties of products, comprising a magnetizing unit connected in series, a transducer, a measuring unit and an indicator, characterized in that, in order to expand the range of thicknesses of the products being monitored and increase the reliability of the control, it is equipped with a memory unit, a comparison circuit and a pulse amplitude meter the inputs of which are connected to the outputs of the comparison circuit and the magnetization unit, the inputs of the storage unit and the comparison circuit are connected to the output of the measurement unit And the second output of the comparison circuit is connected to the input of the magnetization unit. Sources of information taken into account in the examination 1. Non-destructive methods and means of control and their application in industry. Minsk, Science and Technology, 1973. p.81.

2. Flaw detection. 1979, No. 3, p. 29 (prototype).

Phi2. one