阅读说明：本技术 航天用超大型环件轧制过程中温度补偿的方法及专用装置 (Method and special device for temperature compensation in rolling process of extra-large ring for spaceflight ) 是由 马叙 李冠国 马轲 丁燕红 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种航天用超大型环件轧制过程中温度补偿的方法及专用装置,属于环轧领域,具体做法为：在超大型环件轧制过程中,由工件外侧放置的红外温度传感器监测环件表面温度并输出温度信号,当红外温度传感器输出的温度值低于设定的最低轧制温度时,环件轧制的进给速度降低,环绕在环件附近的电磁感应加热器开始工作,对环件进行感应加热,从而对环轧温度进行补偿；当红外温度传感器输出的温度值高于设定的最高轧制温度时,电磁感应加热器停止工作,温度补偿工作结束,环件轧制恢复原来的进给速度。通过这种方法使环件温度始终保持在轧制温度范围内,从而提高产品的质量。(The invention discloses a method and a special device for temperature compensation in the rolling process of an ultra-large ring piece for spaceflight, belonging to the field of ring rolling and comprising the following specific steps: in the rolling process of the ultra-large ring, an infrared temperature sensor arranged on the outer side of a workpiece monitors the surface temperature of the ring and outputs a temperature signal, when the temperature value output by the infrared temperature sensor is lower than the set lowest rolling temperature, the feeding speed of the rolling of the ring is reduced, an electromagnetic induction heater surrounding the ring starts to work, the ring is inductively heated, and therefore the ring rolling temperature is compensated; when the temperature value output by the infrared temperature sensor is higher than the set highest rolling temperature, the electromagnetic induction heater stops working, the temperature compensation work is finished, and the original feeding speed of the ring rolling is recovered. By the method, the temperature of the ring piece is always kept within the rolling temperature range, so that the quality of the product is improved.)

1. A method for temperature compensation in the rolling process of an ultra-large ring for spaceflight is characterized in that: the method comprises the following steps:

(1) before rolling begins, placing an infrared temperature sensor on the outer side of the ring piece, and monitoring the temperature of the ring piece in the ring rolling process in real time;

(2) in the rolling process, when the monitored temperature value is lower than the set lowest rolling temperature, the feeding speed of ring rolling is reduced, and the electromagnetic induction heater surrounding the ring starts to work to compensate the temperature of the ring;

(3) when the monitored temperature value is higher than the set highest rolling temperature, the electromagnetic induction heater stops working, the feeding speed of ring rolling is recovered to the original value, and the temperature compensation is finished.

2. The method for compensating the temperature in the rolling process of the aerospace ultra-large ring according to claim 1, wherein the method comprises the following steps: the infrared temperature sensor in the step (1) can output a temperature signal in real time, and the measurement error of the infrared temperature sensor is +/-1%.

3. The method for temperature compensation in the rolling process of the aerospace ultra-large ring according to claim 1 or 2, wherein the method comprises the following steps: the temperature signal output by the infrared temperature sensor can be displayed on the display in real time.

4. The method for compensating the temperature in the rolling process of the aerospace ultra-large ring according to claim 1, wherein the method comprises the following steps: the ring rolling feed speed in the step (2) is reduced toWherein R is_DFor driving the roll radius, R is the instantaneous outer diameter of the ring, R is the instantaneous inner diameter of the ring, R_MRadius of the core roll, n_D＝w_D/2π，w_DIs the angular velocity.

5. The method for compensating the temperature in the rolling process of the aerospace ultra-large ring according to claim 1, wherein the method comprises the following steps: the electromagnetic induction heater in the step (2) moves along with the increase of the diameter of the ring, and the distance between a heating coil of the electromagnetic induction heater and the surface of the ring is fixed.

6. The method for temperature compensation in the rolling process of the aerospace ultra-large ring according to claim 1 or 5, wherein the method comprises the following steps: heating frequency f of electromagnetic induction heater_c＝4×10⁸ρ/μa²Where ρ is the resistivity of the material in ohms/cm, μ is the relative magnetic permeability of the workpiece of the material, and a is the thickness of the material.

7. The method for temperature compensation in the rolling process of the aerospace ultra-large ring according to claim 1 or 5, wherein the method comprises the following steps: the heating power of an electromagnetic induction heater is (kilogram/hour capacity) x (kilowatt-hour/kilogram) x (efficiency factor), where (kilowatt-hour/kilogram) is the heat capacity, which refers to the total energy required to heat a material to a particular temperature.

8. A special device for realizing the method for temperature compensation in the rolling process of the aerospace ultra-large ring, which is characterized in that: comprises an I-shaped track (3) which is transversely arranged, an electromagnetic induction heater which is arranged on the I-shaped guide rail (3) and can freely move along the transverse direction of the track, and a distance measuring device (7) which is arranged on the electromagnetic induction heater; the electromagnetic induction heater consists of a C-shaped heating coil (4) and a motor and signal processor module (5) arranged on the upper part of the C-shaped heating coil (4), the C-shaped heating coil (4) is connected with the motor and signal processor module (5) through a connecting rod, a clamping device (6) is arranged on the top of the motor and signal processor module (5), and the clamping device (6) is clamped on the I-shaped track (3); the clamping device (6) is provided with a pulley and is driven by a motor to rotate, so that the electromagnetic induction heater is driven to move along the I-shaped track (3); the distance measuring device (7) is fixed on the inner side of the C-shaped heating coil (4) of the electromagnetic induction heater, the distance between the distance measuring device (7) and the side face of the annular workpiece is measured through an infrared probe arranged on the distance measuring device, and measured data are transmitted to the motor and signal processor module (5) on the upper portion of the coil and used for controlling the starting and stopping of the motor, so that the distance between the electromagnetic induction heater and the annular workpiece is kept constant.

9. The special device for the method for temperature compensation in the rolling process of the extra-large ring for aerospace according to claim 8, wherein the special device comprises: two ends of the H-shaped track (3) are fixed on the first support (1) and the second support (2), and the joints of the first support (1) and the second support (2) and the H-shaped track (3) are fixed together through bolts.

10. The special device for the method for temperature compensation in the rolling process of the extra-large ring for aerospace according to claim 8, wherein the special device comprises: the fixture (6) is of a C-shaped structure with an opening at the top and is used for being clamped on the I-shaped track (3).

Technical Field

The invention belongs to the field of ring rolling, and particularly relates to a temperature compensation method in the rolling process of an ultra-large ring for spaceflight.

Technical Field

Ring rolling, also known as ring rolling and reaming, belongs to the plastic forming technique. By continuously pressurizing the ring blank using high-speed rotating rolls in the ring expansion device, the wall thickness of the ring blank is gradually reduced during rotation. The ring rolling has many technical and economic advantages of high production efficiency, high precision, high quality, cost saving, high efficiency and the like, saves energy, reduces materials and brings low production cost. At present, large rings are widely applied to various fields of industrial manufacturing such as wind power equipment manufacturing, nuclear reactors, aerospace and the like due to good mechanical properties of the large rings, wherein the large rings are more widely applied to the aerospace field.

However, the rolling time of the large ring is long, and the temperature of the ring can not meet the rolling requirement in the later rolling stage, so that the product quality is influenced. It is essential to temperature compensate the ring during rolling. And the secondary heating of the ring piece in the rolling process wastes time and energy, and meanwhile, the semi-finished product of the ring piece has larger size, has higher requirement on the size of a heating furnace and is difficult to realize, so a new method for carrying out temperature compensation on the ring piece in rolling is required.

Disclosure of Invention

The invention provides a method for temperature compensation in the rolling process of an ultra-large ring for spaceflight, aiming at solving the defects of the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions.

A method for temperature compensation in the rolling process of an ultra-large ring for spaceflight comprises the following steps:

(1) before rolling begins, placing an infrared temperature sensor on the outer side of the ring piece, and monitoring the temperature of the ring piece in the ring rolling process in real time;

(2) in the rolling process, when the monitored temperature value is lower than the set lowest rolling temperature, the feeding speed of ring rolling is reduced, and the electromagnetic induction heater surrounding the ring starts to work to compensate the temperature of the ring;

(3) when the monitored temperature value is higher than the set highest rolling temperature, the electromagnetic induction heater stops working, the feeding speed of ring rolling is recovered to the original value, and the temperature compensation is finished.

The infrared temperature sensor in the further step (1) can output a temperature signal in real time, and the measurement error of the infrared temperature sensor is +/-1%.

The temperature signal output by the further infrared temperature sensor can be displayed on the display in real time.

The feed speed of the ring rolling in the further step (2) is reduced toWherein R is_DFor driving the roll radius, R is the instantaneous outer diameter of the ring, R is the instantaneous inner diameter of the ring, R_MRadius of the core roll, n_D＝wD/2π，w_DIs the angular velocity.

The electromagnetic induction heater in the further step (2) can move along with the increase of the diameter of the ring, and the distance between a heating coil of the electromagnetic induction heater and the surface of the ring is fixed.

Further, the heating frequency fc of the electromagnetic induction heater is 4 × 10⁸ρ/μa²Where ρ is the resistivity of the material in ohms/cm, μ is the relative magnetic permeability of the workpiece of the material, and a is the thickness of the material.

Further electromagnetic induction heaters have a heating power (kg/h capacity) x (kwh/kg) x (efficiency factor), where kwh/kg is the heat capacity, which refers to the total energy required to heat the material to a particular temperature.

The device comprises an I-shaped rail, an electromagnetic induction heater and a distance measuring device, wherein the I-shaped rail is transversely arranged, the electromagnetic induction heater is arranged on the I-shaped rail and can transversely and freely move along the rail, and the distance measuring device is arranged on the electromagnetic induction heater; the electromagnetic induction heater consists of a C-shaped heating coil, a motor and a signal processor module which are arranged on the upper part of the C-shaped heating coil, the C-shaped heating coil is connected with the motor and the signal processor module through a connecting rod, a clamping device is arranged on the top of the motor and signal processor module, and the clamping device is clamped on the I-shaped track; the clamp is provided with a pulley which is driven by a motor to rotate so as to drive the electromagnetic induction heater to move along the I-shaped track; the distance measuring device is fixed on the inner side of the C-shaped heating coil of the electromagnetic induction heater, the distance between the distance measuring device and the side face of the annular workpiece is measured through an infrared probe arranged on the distance measuring device, the measured data is transmitted to the motor and the signal processor module on the upper portion of the coil, and the distance measuring device is used for controlling the opening and closing of a switch of the motor, so that the distance between the electromagnetic induction heater and the annular workpiece is kept constant.

Furthermore, two ends of the H-shaped track are fixed on the first support and the second support on the ground. The first support and the second support are fixed together with the connection position of the I-shaped track through bolts.

Furthermore, the fixture is of a C-shaped structure with an opening at the top and is used for being clamped on the I-shaped track.

The invention has the beneficial effects that: the invention quickly compensates the ring temperature in the rolling process of the ultra-large ring by the electromagnetic induction heater, so that the temperature of the ring is always in the rolling temperature range, the defect of the ring caused by the fact that the rolling temperature cannot meet the requirement is reduced, and the product quality is improved.

Drawings

FIG. 1 is a flow chart of the present invention.

FIG. 2 is a schematic diagram of the positional relationship between the electromagnetic induction heater and the rolling mill and the ring.

Fig. 3 is a schematic view of the fixed connection of the ring on the rolling mill.

In the figure, 1, a first support, 2, a second support, 3, an I-shaped track, 4, a c-shaped heating coil, 5, a motor and signal processor module, 6, a fixture, 7, a distance measuring device, 8, a ring, 9, a driving roller, 10, a core roller and 11, a conical roller are arranged.

Detailed Description

Referring to the attached figure 1, the temperature compensation method in the ring rolling of the invention comprises the following steps: (1) before rolling begins, placing an infrared temperature sensor on the outer side of the ring piece, and monitoring the temperature of the ring piece in the ring rolling process in real time; the infrared temperature sensor can output a temperature signal in real time, the measured error of the infrared temperature sensor is +/-1%, and the temperature signal can be displayed on a display in real time.

(2) In the rolling process, when the monitored temperature value is lower than the set lowest rolling temperature, the feeding speed of ring rolling is reduced, and the electromagnetic induction heater surrounding the ring starts to work to compensate the temperature of the ring;

in the invention, the ring rolling feed speed is reduced toWherein R is_DFor driving the roll radius, R is the instantaneous outer diameter of the ring, R is the instantaneous inner diameter of the ring, R_MRadius of the core roll, n_D＝w_D/2π，w_DIs the angular velocity.

(3) When the monitored temperature value is higher than the set highest rolling temperature, the electromagnetic induction heater stops working, the feeding speed of ring rolling is recovered to the original value, and the temperature compensation is finished.

When the temperature compensation is carried out on the ring pieces with different diameters, the electromagnetic induction heater can be adjusted along with the change of the diameter of the ring piece, and the distance between the heating coil of the electromagnetic induction heater and the surface of the ring piece is ensured to be fixed.

Heating frequency f of electromagnetic induction heater of the invention_c＝4×10⁸ρ/μa²Where ρ is the resistivity of the material in ohms/cm, μ is the relative magnetic permeability of the workpiece of the material, and a is the thickness of the material. The heating power of an electromagnetic induction heater is (kilogram/hour capacity) x (kilowatt-hour/kilogram) x (efficiency factor), where (kilowatt-hour/kilogram) is the heat capacity, which refers to the total energy required to heat a material to a particular temperature.

The temperature compensation in the process of rolling the ring is realized by a heating device, which is shown in figure 2 and comprises an I-shaped guide rail 3 arranged above a rolling mill, an electromagnetic induction heater which is arranged on the I-shaped guide rail 3 and can freely move along the transverse direction of a track, and a distance measuring device 7 arranged on the electromagnetic induction heater. Referring to fig. 3, the ring member installed on the rolling mill is clamped and fixed by the driving roller, the core roller and the conical roller, and is driven to rotate by the driving roller. The two ends of the I-shaped track 3 of the device are fixed on the first support 1 and the second support 2 on the ground, and the joints of the two supports and the I-shaped track 3 are fixed together through bolts, so that the device is convenient to disassemble; the electromagnetic induction heater comprises a C-shaped heating coil 4 and a motor and signal processor module 5 arranged on the upper portion of the C-shaped heating coil 4, wherein the C-shaped heating coil 4 is electrified to form an eddy current to heat a ring piece on a rolling mill, the C-shaped heating coil 4 is connected with the motor and signal processor module 5 through a connecting rod, a clamping apparatus 6 is arranged at the top of the motor and signal processor module 5, and the electromagnetic induction heater is clamped on an I-shaped track through the clamping apparatus 6. The fixture 6 is in a C-shaped structure with an opening at the top and is used for being clamped on the I-shaped track 3. The clamp 6 is provided with a pulley which can rotate under the driving of a motor, so as to drive the electromagnetic induction heater to move along the I-shaped track 3; the distance measuring device 7 is fixed on the inner side of the C-shaped heating coil 4 of the electromagnetic induction heater, measures the distance between the distance measuring device and the side surface of the annular workpiece through an infrared probe arranged on the distance measuring device, transmits the measured data to the motor and signal processor module 5 on the upper part of the coil, and is used for controlling the opening and closing of a switch of the motor, so that the distance between the electromagnetic induction heater and the annular workpiece is kept constant.

The invention is further described with reference to specific examples.