CN212713634U - Gas controllable cooling induction quenching device - Google Patents

Abstract

The utility model discloses a gaseous controllable refrigerated response guenching unit, include: a preheating chamber for preheating the workpiece; the high-pressure-resistant sealed cavity provides a heat treatment space for induction heating and cooling of the workpiece; the induction coil spraying sleeve consists of induction coils and spraying sleeves which are spirally arranged side by side so as to quickly perform induction heating and quick cooling on the preheated utility model workpiece; a heat preservation furnace for performing heat preservation treatment on the cooled utility model workpiece; and the gas supply system is used for providing high-pressure gas or supercritical gas for the spray sleeve of the utility model. The utility model discloses a gaseous controllable refrigerated response guenching unit adopts preheating and heating + vacuum induction heating's heating process, realizes the controllable quenching of work piece through gaseous pressure of regulation, temperature and the velocity of flow in resistant high pressure seal cavity, and has effectively prevented work piece high temperature oxidation, has gained faster more ideal cooling effect, has improved the performance of work piece greatly.

Description

Gas controllable cooling induction quenching device

Technical Field

The utility model relates to the technical field of heat treatment, in particular to a gas controllable cooling induction quenching device.

Background

The existing heat treatment process generally adopts a vacuum furnace quenching process to quench workpieces in a vacuum atmosphere or an air atmosphere; or quenching treatment is carried out by using a continuous furnace and adopting a quenching medium such as quenching liquid; or an induction hardening machine (when processing large-sized workpieces or rotary discs) is adopted to carry out hardening treatment on the surface of the product. In these techniques, the vacuum heat treatment equipment has a complex structure and low equipment reliability and stability; the vacuum furnace can only adopt a batch production mode, the production efficiency is low, and the production cost is high.

The induction quenching is a heat treatment method for obtaining a specific surface structure and hardness, which utilizes the principle of electromagnetic induction to enable a workpiece to cut magnetic lines in an alternating magnetic field, generates induction current on the surface of the workpiece, rapidly heats the surface of the workpiece in an eddy current mode according to the skin effect of alternating current, and then rapidly cools the workpiece. The induction quenching has the advantages of high heating rate, high production efficiency and energy conservation, and the method has wide application in the surface hardening of shaft parts and plays an important role in the field of heat treatment.

At present, the commonly used induction quenching coolant in China is water cooling, and has the defects of simple cooling method, uncontrollable cooling rate and incapability of realizing some special cooling process requirements, thereby greatly limiting the application range of the process.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: aiming at the defects in the prior art, the induction hardening device with controllable gas cooling is provided.

The utility model mainly provides a gas controllable cooling induction quenching device, which adopts the heating process of preheating and vacuum induction heating, selects high-pressure air, supercritical air, high-pressure nitrogen or supercritical nitrogen to replace as coolant, adopts a spray cooling mode to realize rapid cooling of the workpiece after induction heating in a closed high-pressure resistant sealed cavity, or synchronously carries out induction heating and rapid cooling of the workpiece in the sealed cavity with the coolant introduced in advance; after the workpiece is cooled to a certain temperature, the workpiece is quickly transferred to a heat preservation chamber for subsequent cooling; in addition, the workpiece is cooled according to a set cooling curve by accurately controlling the temperature, the pressure, the flow and the temperature of the holding furnace.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a gaseous controllable refrigerated response guenching unit, include:

a preheating chamber for preheating the workpiece;

the high-pressure-resistant sealed cavity provides a heat treatment space for induction heating and cooling of the workpiece;

the induction coil spraying sleeve is composed of induction coils and spraying sleeves which are spirally arranged side by side so as to quickly perform induction heating and quick cooling on the preheated workpiece;

a heat preservation furnace for performing heat preservation treatment on the cooled workpiece; and

and the gas supply system is used for supplying high-pressure gas or supercritical gas to the spraying sleeve.

Further, on the induction quenching device with controllable cooling of gas, the induction coil injection sleeve is of an integrated structure integrating induction heating and cooling injection, which is formed by spirally bending a double-hole copper pipe, and circulating cooling water is communicated in the copper pipe forming the induction coil; the inner side wall of the copper pipe forming the injection sleeve is provided with a plurality of vent holes which are communicated with the air supply system.

Further, on the gaseous controllable refrigerated response guenching unit, response quenching station C position in the induction coil injection cover has arranged revolving stage and infrared temperature sensor, infrared temperature sensor set up in the work piece surface, the work piece place in on the revolving stage.

Further, on the induction quenching device with controllable cooling of gas, a post-preheating station A, a pre-induction quenching station B and a pre-heat-preservation station D are sequentially arranged among the preheating chamber, the heat preservation furnace and the high-pressure-resistant sealed cavity.

Further preferably, on the induction hardening apparatus with controllable gas cooling, the workpiece is transferred among the post-preheating station a, the pre-induction hardening station B, the induction hardening station C and the pre-heat-preservation station D by a manipulator.

Further, on the induction quenching device with controllable cooling of gas, the high-pressure gas is high-pressure air or high-pressure nitrogen; the supercritical gas is supercritical air or supercritical nitrogen.

Further, on the induction hardening device with controllable cooling of gas, the gas supply system is an air supply system or a nitrogen supply system and is prepared on site by a booster pump or a nitrogen generator set.

Further preferably, on the induction hardening apparatus with controllable gas cooling, the air supply system comprises a first booster pump and a first intermediate air storage tank which are sequentially connected through a pipeline, and the first intermediate air storage tank is communicated with the injection sleeve through a pipeline so as to provide high-pressure air for the injection sleeve.

Further preferably, on the induction hardening apparatus with controllable gas cooling, the nitrogen gas supply system comprises a nitrogen generator set, a gas storage tank, a second booster pump and a second intermediate gas storage tank which are connected in sequence through pipelines, wherein: and the second intermediate gas storage tank is communicated with the spraying sleeve through a pipeline so as to provide high-pressure nitrogen or supercritical nitrogen for the spraying sleeve.

Further, the induction quenching device with the controllable cooling of the gas also comprises a PID controller, and the PID controller is respectively and electrically connected with the induction coil, the infrared temperature sensor and the flow sensor.

The above technical scheme is adopted in the utility model, compared with the prior art, following technological effect has:

(1) the heating and cooling rates are controllable: the controllable cooling device adopts high-pressure nitrogen or supercritical nitrogen for quenching, and can realize controllable cooling of the workpiece by adjusting the pressure, temperature and flow rate of the nitrogen; and the preheating before induction quenching and the heat preservation after induction quenching are assisted, so that the complex heat treatment process such as isothermal quenching can be realized;

(2) the method is environment-friendly: the controllable cooling device adopts environment-friendly nitrogen or air as a coolant, the production process is pollution-free, and the used high-pressure nitrogen or high-pressure air can be directly discharged or recycled;

(3) energy conservation: the controllable cooling device quenches the surface layer of the appointed part of the workpiece, so that the integral workpiece is not required to be heated, and heat energy is greatly saved; meanwhile, because only the surface layer at the local position is quenched, the cooling workload is greatly reduced, and the consumption of high-pressure nitrogen or supercritical nitrogen can be saved;

(4) the production efficiency is high: the induction coil injection sleeve with a special structure is adopted for rapid heating and rapid cooling, the heating and cooling time is only a few seconds or dozens of seconds, and the time is greatly saved compared with the traditional heat treatment;

(5) the cost is saved: the heat treatment cost of the workpiece is greatly reduced due to the energy and material conservation;

(6) the performance is excellent: the high-frequency induction controllable quenching is carried out on the workpiece in the high-pressure resistant sealed cavity, so that the high-temperature oxidation of the workpiece is effectively prevented, and the cooling effect which is quicker and more ideal than the traditional heat treatment can be achieved, thereby greatly improving the performance of the workpiece.

Drawings

FIG. 1 is a schematic view of the overall structure of a gas-controlled cooling induction quenching apparatus according to the present invention;

FIG. 2 is a schematic cross-sectional view of an induction coil injection sleeve in an induction hardening apparatus with controllable gas cooling according to the present invention;

FIG. 3 is a schematic structural view of a high-pressure air supply system in the induction quenching apparatus with controllable gas cooling according to the present invention;

FIG. 4 is a schematic structural view of a nitrogen gas supply system in an induction quenching apparatus with controllable gas cooling according to the present invention;

FIG. 5 is a schematic diagram of a frame of a system for controlling the surface temperature of a workpiece in an induction hardening apparatus with controlled gas cooling according to the present invention;

FIG. 6 is a schematic view of a process flow of a gas controlled cooling induction hardening method of the present invention;

FIG. 7 is a schematic view of another process flow of a gas controlled cooling induction hardening method according to the present invention;

wherein the reference symbols are:

10-a workpiece; 20-a preheating chamber; 30-high pressure resistant sealed cavity; 40-induction coil injection sleeve, 41-induction coil, 42-cooling tube, 43-rotating table, 44-infrared temperature sensor; 50-a heat preservation furnace; 60-air supply system, 61-air supply system, 611-first booster pump, 612-first intermediate air storage tank, 613-regulating valve, 614-pressure sensor, 615-temperature sensor; 62-nitrogen gas supply system, 621-nitrogen making unit, 622-first stop valve, 623-gas storage tank, 624-second stop valve, 625-second booster pump, 626-second middle gas storage tank, 627-regulating valve, 628-pressure sensor and 629-temperature sensor; a-a post-preheating station, B-an induction quenching front station, C-an induction quenching station and D-a heat preservation front station.

Detailed Description

The present invention will be described in detail and specifically with reference to specific embodiments so as to provide a better understanding of the present invention, but the following embodiments do not limit the scope of the present invention.

Example 1

Referring to fig. 1, the present embodiment provides a gas-controlled cooling induction hardening apparatus, including: a preheating chamber 20 for performing a preheating process on the workpiece 10; a high pressure-resistant sealed chamber 30 for providing a heat treatment space for induction heating and cooling of the workpiece 10; an induction coil spray sleeve 40, which is composed of an induction coil 41 and a spray sleeve 42 arranged side by side in a spiral manner, for performing rapid induction heating and rapid cooling on the preheated workpiece 10; a holding furnace 50 for holding the cooled workpiece 10; and a gas supply system 60 for supplying high pressure gas or supercritical gas to the injection sleeve 42. .

In the present embodiment, referring to fig. 1 and fig. 2, a rotary table 43 and an infrared temperature sensor 44 are disposed at the position of the induction quenching station C in the induction coil spraying sleeve 40; the infrared temperature sensor 44 is arranged on the surface of the workpiece 10 and used for monitoring the temperature of the surface of the workpiece 10 in real time, and the infrared temperature sensor 44 adopts an infrared thermometer; the workpiece 10 is placed on the rotating table 43, and the workpiece 10 rotates at a certain speed in the heating and cooling processes, specifically, the rotating table 43 drives the workpiece 10 thereon to rotate in the heat treatment process, so as to improve the cooling efficiency. The power supply for high frequency induction heating of the induction coil 41 has a wide adjustable frequency and power range, and the rate and depth of heating of the workpiece is varied by adjusting the frequency and power of the power supply.

In this embodiment, please refer to fig. 1, wherein a post-preheating station a, a pre-induction quenching station B and a pre-heat-preservation station D are sequentially disposed between the preheating chamber 20, the heat-preserving furnace 50 and the high-pressure-resistant sealed cavity 30; and an induction quenching station C is arranged in the induction coil injection sleeve 30; the workpiece 10 is transferred among the post-preheating station A, the induction quenching station B, the induction quenching station C and the heat-preserving station D through a manipulator.

Referring to fig. 1, the working principle of the induction hardening apparatus with controllable gas cooling provided in this embodiment is as follows: the workpiece 10 enters the preheating chamber 20, and the workpiece 10 is preheated to a certain temperature through the preheating chamber 20; then, the workpiece 10 is transferred into the high-pressure-resistant sealed cavity 30 by the robot hand, high-frequency induction heating is carried out by adopting the induction coil 41, the workpiece 10 is rapidly cooled, the cooling rate of the workpiece 10 is set to an ideal cooling curve according to the material, shape and service requirements of the workpiece, when the temperature of the workpiece 10 is reduced to the set temperature, the workpiece 10 is conveyed to the heat preservation furnace 50 by the robot hand, and subsequent cooling is carried out according to the process requirements.

Example 2

Referring to fig. 2, the present embodiment provides an induction coil injection sleeve 40 for an induction quenching apparatus with controllable gas cooling, wherein the induction coil injection sleeve 40 is an integrated structure of induction heating and cooling injection formed by spirally bending a double-hole copper pipe, and circulating cooling water is communicated in the copper pipe forming the induction coil 41; the inner side wall of the copper tube constituting the injection sleeve 42 is provided with a plurality of vent holes which are communicated with the gas supply system 60. The air supply system 60 is an air supply system 61 or a nitrogen supply system 62. The workpiece 10 is heated and cooled in the induction coil spray sleeve 40, and cooling water is used for cooling the induction coil 31 when the workpiece is heated, so that the temperature of the induction coil 31 is prevented from being excessively increased. High-pressure gas or supercritical gas is directly sprayed on the surface of the workpiece 10 through the spraying sleeve 42 to rapidly cool the workpiece 10; or pre-spraying the workpiece 10 into the pressure-resistant sealed cavity 30 to synchronously cool the workpiece 10 in the high-frequency induction heating process, wherein the induction heating rate of the workpiece 10 is greater than the cooling rate.

The induction quenching device with controllable gas cooling provided by the embodiment adopts the induction coil 41 to quench only the surface layer of the designated part of the workpiece 10, so that the integral workpiece is not required to be heated, and the heat energy is greatly saved; meanwhile, because only the surface layer at the local position is quenched, the cooling workload is greatly reduced, the consumption of high-pressure gas or supercritical gas can be saved, and the energy is saved. The induction coil injection sleeve 40 adopting the special structure is used for quickly heating and cooling, the heating and cooling time is only a few seconds or dozens of seconds, and compared with the traditional heat treatment method, the quenching treatment time is greatly saved.

Example 3

Referring to fig. 3, the present embodiment provides an air supply system 61 for an induction hardening apparatus with controllable gas cooling, high-pressure coolant air is manufactured at a production site, the air supply system 61 includes a first booster pump 611 and a first intermediate air tank 612 which are sequentially connected through a pipeline, and the first intermediate air tank 612 is communicated with the injection sleeve 42 through a pipeline to provide high-pressure air for the injection sleeve 42.

In this embodiment, as shown in fig. 3, an adjusting valve 613 is disposed on a pipe between the first intermediate air tank 612 and the injection sleeve 42. A pressure sensor 614 and a temperature sensor 615 are arranged on the first intermediate air storage tank 612, a flow sensor is arranged in the injection sleeve 42, and the pressure and the temperature of the air in the first intermediate air storage tank 612 can be monitored in real time through the pressure sensor 614 and the temperature sensor 615; and the flow rate of the air sprayed by the spraying sleeve 42 can be monitored in real time through a flow sensor.

In the present embodiment, the working principle of the high-pressure air supply system 61 is as follows: air enters a first intermediate air storage tank 612 through a first booster pump 611, and a pressure sensor 614 and a temperature sensor 615 are arranged in the first intermediate air storage tank 612 and used for detecting that the temperature and the pressure in the tank are in a set working range; the high pressure air in the first intermediate air tank 612 enters the injection sleeve 42 through the adjusting valve 613, and the injection sleeve 42 injects the high pressure air to the surface of the workpiece 10, so that the workpiece is cooled. The temperature, pressure and flow rate of the high pressure gas ejected from the illustrated ejection sleeve 42 can be adjusted to achieve controlled cooling of the workpiece 10.

Example 4

Referring to fig. 4, the present embodiment provides a nitrogen supply system 62 for a gas controlled cooling induction hardening apparatus, the coolant nitrogen being either a commercially available canned gas or produced at the production site. In this embodiment, the high pressure nitrogen or supercritical nitrogen provided by the nitrogen supply system 62 is prepared on-site by a nitrogen generator set. The nitrogen gas supply system 62 includes a nitrogen generator group 621, a gas storage tank 623, a first booster pump 625 and a first intermediate gas storage tank 626 connected in sequence by pipes, wherein: the first intermediate air reservoir 626 is connected to the injection sleeve 42 through a pipe to supply high pressure nitrogen or supercritical nitrogen to the injection sleeve 42.

In this embodiment, please refer to fig. 4, a first stop valve 622 is disposed between the nitrogen generating unit 621 and the air storage tank 623; a second stop valve 624 is arranged between the air storage tank 623 and the first booster pump 625; and a regulating valve 627 is arranged on a pipeline between the first intermediate air storage tank 626 and the injection sleeve 42. The first intermediate air storage tank 626 is provided with a pressure sensor 628 and a temperature sensor 629, the spraying sleeve 42 is internally provided with a flow sensor, and the pressure and the temperature of the nitrogen in the first intermediate air storage tank 626 can be monitored in real time through the pressure sensor 628 and the temperature sensor 629; and the flow rate of the nitrogen sprayed by the spraying sleeve 42 can be monitored in real time through a flow sensor.

In this embodiment, the working principle of the nitrogen gas supply system 62 is as follows: the nitrogen generator set 621 generates nitrogen gas from air, the nitrogen gas enters the gas storage tank 623 through the first stop valve 622, and then enters the first intermediate gas storage tank 626 through the second stop valve 624 and the first booster pump 625, the first intermediate gas storage tank 626 is provided with a pressure sensor 628 and a temperature sensor 629, the high-pressure nitrogen gas or the supercritical nitrogen gas in the first intermediate gas storage tank 626 for detecting the temperature and the pressure in the tank in a set working range enters the injection sleeve 42 through the regulating valve 627, and the injection sleeve 42 injects the high-pressure nitrogen gas or the supercritical nitrogen gas onto the surface of the workpiece 10, so that the workpiece 10 is cooled. The temperature, pressure and flow rate of the high pressure or supercritical nitrogen gas ejected from the illustrated ejection sleeve 42 can be adjusted to achieve controlled cooling of the workpiece 10.

Example 5

Referring to fig. 5, the present embodiment further provides a workpiece cooling speed temperature-time control system for an induction hardening apparatus with gas controllable cooling, which includes two functional units, i.e., a PID controller and sensors of a controlled object. The PID controller is electrically connected to the induction coil 41 and the infrared temperature sensor 44, respectively, and to each functional unit such as a pressure sensor, a temperature sensor, and a flow sensor in the air supply system 61 or the nitrogen supply system 62. When the workpiece 10 is quenched by high-pressure air or high-pressure nitrogen gas including supercritical state thereof, the PID controller can adjust the pressure, temperature and flow rate of the air or nitrogen gas according to the data monitored by the infrared temperature sensor 44, the pressure sensor, the temperature sensor and the flow sensor in real time to realize the controllable cooling of the workpiece 10; and the preheating before induction quenching and the heat preservation after induction quenching are assisted, so that the complex heat treatment process such as isothermal quenching can be realized.

The PID controller is a linear controller that performs process control based on an error e (t) between a set value r (t) and an actual output value c (t), r (t) -c (t). In this embodiment, the surface temperature y (t) of the workpiece is used as a control object, the surface temperature of the workpiece is measured in real time by the infrared temperature sensor 44, the measured value c (t) is fed back to the PID controller, the controller outputs an analog signal u (t) to the PID controller through PID adjustment operation according to an error value e (t), and the PID controller adjusts parameters such as the fluid velocity affecting the heat transfer coefficient according to the output analog signal u (t).

Example 6

Based on the induction hardening apparatus with controllable gas cooling provided in any one of embodiments 1 to 5, this embodiment provides an induction hardening method with controllable gas cooling, in which the pressure-resistant closed cavity 30 is evacuated in advance, then the workpiece 10 is subjected to high-frequency induction heating by using the induction coil 41 on the rotary table 43 of the induction hardening station C in the induction coil injection sleeve 40, and after the workpiece is heated to a set temperature and surface thickness, high-pressure gas is injected to the surface of the workpiece 10 by the injection sleeve 42 to forcibly cool the workpiece 10.

Specifically, referring to fig. 6, the present embodiment provides a gas-controlled cooling induction quenching method, including the following steps:

s11, preheating the workpiece: preheating a workpiece in a heat preservation furnace to a set temperature, transferring the workpiece from the heat preservation furnace to a post-preheating station according to a program, and then transferring the workpiece to a pre-induction quenching station for later use;

s12, high-frequency induction heating: grabbing a workpiece by a manipulator, feeding the workpiece into a high-pressure-resistant sealed cavity, placing the workpiece on an induction quenching station in an induction coil injection sleeve, vacuumizing the high-pressure-resistant sealed cavity, introducing high-frequency current into an induction coil, and quickly carrying out induction heating on the surface of the workpiece to form a high-temperature area of 1-3mm, wherein the temperature of the high-temperature area is high enough to quickly form a set tissue by the material;

s13, high-pressure gas jet cooling: after the workpiece is heated to reach the set temperature and surface thickness, high-pressure gas or supercritical gas with preset temperature and pressure is sprayed to the surface of the workpiece through the spraying sleeve, and the workpiece is forcibly cooled; stopping cooling when the temperature of the workpiece reaches the set isothermal quenching temperature, and automatically transferring the workpiece to a station before heat preservation;

s14, workpiece heat preservation: and (4) grabbing the workpiece by adopting a manipulator, and conveying the workpiece on the station before heat preservation into a heat preservation furnace for heat preservation treatment to finish subsequent cooling and tissue transformation.

In the present embodiment, the high-pressure gas in steps S13 and S23 is high-pressure air or high-pressure nitrogen; the supercritical gas is supercritical air or supercritical nitrogen. The adopted air or nitrogen can be prepared on site by adopting an air supply system 61 or a nitrogen supply system 62, the nitrogen or the air is used as an environment-friendly coolant, the production process is pollution-free, and the used high-pressure nitrogen or the high-pressure air can be directly discharged or recycled.

In this embodiment, in steps S13 and S23, the induction heating time is 5 to 30 seconds, the forced cooling time is 7 to 35 seconds, the heating and cooling time is only a few seconds or a few tens of seconds, and the quenching treatment efficiency is high. And because only the surface layer at a local position is quenched, the cooling workload is greatly reduced, the consumption of high-pressure gas can be saved, and the heat treatment cost of the workpiece is reduced.

In the present embodiment, in step S13, the rotational speed and the electrical input power density of the rotating table 33 must be precisely designed and controlled to control the rate, depth and temperature uniformity of heating.

In this embodiment, in step S13, the temperature, pressure and flow rate of the high-pressure gas or supercritical gas must be precisely measured and controlled to achieve the cooling of the workpiece according to the ideal cooling curve, and the temperature of the workpiece during the cooling process is measured and controlled in real time.

According to the induction quenching method with controllable gas cooling, the induction heating and cooling processes are performed in the vacuumized pressure-resistant closed cavity, so that the workpiece can be effectively prevented from being oxidized, and a cooling effect which is faster and more ideal than the traditional heat treatment can be achieved, and the performance of the workpiece is greatly improved; and energy and materials are saved, and the heat treatment cost of the workpiece is reduced.

Example 7

Based on the induction hardening apparatus with controllable gas cooling provided in any one of embodiments 1 to 5, this embodiment provides an induction hardening method with controllable gas cooling, in which the pressure-resistant closed cavity 30 is vacuumized in advance and high-pressure gas or supercritical gas is introduced, then the workpiece 10 is subjected to high-frequency induction heating by using the induction coil 41 on the rotating table 43 of the induction hardening station C in the induction coil injection sleeve 40, and meanwhile, the heated workpiece is subjected to synchronous forced cooling by the coolant pre-charged in the pressure-resistant closed cavity 30, and when the workpiece is heated to reach the set temperature and surface thickness, the induction heating is stopped.

Specifically, referring to fig. 7, the present embodiment provides a gas-controlled cooling induction quenching method, including the following steps:

s21, preheating the workpiece: preheating a workpiece to a set temperature in a heat preservation furnace, transferring the workpiece to a post-preheating station from the heat preservation furnace according to a program, and then transferring the workpiece to a pre-induction quenching station for later use;

s22, vacuumizing and ventilating: grabbing a workpiece by a manipulator, conveying the workpiece into a high-pressure-resistant sealed cavity, placing the workpiece on an induction quenching station in an induction coil injection sleeve, vacuumizing the high-pressure-resistant sealed cavity, and injecting high-pressure gas or supercritical gas with preset temperature and pressure through the injection sleeve;

s23, high-frequency induction heating and cooling: introducing high-frequency current to the induction coil, rapidly carrying out induction heating on the surface of the workpiece to form a high-temperature area of 1-3mm, wherein the temperature of the high-temperature area is high enough to enable the material to rapidly form a set tissue, and simultaneously, high-pressure gas or supercritical gas which is pre-sprayed into the high-pressure resistant sealed cavity is used for synchronously and forcibly cooling the workpiece; when the temperature of the workpiece reaches the set isothermal quenching temperature, stopping induction heating, and automatically moving the workpiece down to a station before heat preservation;

s24, workpiece heat preservation: and (4) grabbing the workpiece by adopting a manipulator, and conveying the workpiece on the station before heat preservation into a heat preservation furnace for heat preservation treatment to finish subsequent cooling and tissue transformation.

In this embodiment, the high-pressure gas or the supercritical gas in step S13 is air or nitrogen; the high-pressure gas or supercritical gas in step S23 is nitrogen or an inert gas. The adopted air or nitrogen can be prepared on site by adopting an air supply system 61 or a nitrogen supply system 62, the nitrogen or the air is used as an environment-friendly coolant, the production process is pollution-free, and the used high-pressure nitrogen or the high-pressure air can be directly discharged or recycled.

In this embodiment, in steps S13 and S23, the induction heating time is 1-30S, the forced cooling time is 1-35S, the heating and cooling time is only a few seconds or a few tens of seconds, and the quenching treatment efficiency is high. And because only the surface layer at a local position is quenched, the cooling workload is greatly reduced, the consumption of high-pressure gas can be saved, and the heat treatment cost of the workpiece is reduced.

In the present embodiment, in step S23, the rotational speed and the electrical input power density of the rotating table 33 must be precisely designed and controlled to control the rate, depth and temperature uniformity of heating.

In this embodiment, in step S23, the temperature, pressure and flow rate of the high-pressure nitrogen gas or the supercritical nitrogen gas must be precisely measured and controlled to achieve the cooling of the workpiece according to the ideal cooling curve, and the temperature of the workpiece during the cooling process is measured and controlled in real time.

In the induction quenching method with controllable gas cooling provided by the embodiment, the induction heating and cooling processes are performed in the vacuumized pressure-resistant closed cavity, and the coolant is injected in advance, so that the induction heating and cooling are performed synchronously, the workpiece is effectively prevented from being oxidized, and meanwhile, a faster and more ideal cooling effect is further obtained compared with the quenching method in the embodiment 6, and the performance of the workpiece is remarkably improved; and energy and materials are saved, and the heat treatment cost of the workpiece is reduced.

To sum up, the utility model provides a gaseous controllable refrigerated response guenching unit carries out the controllable quenching of high frequency induction to the work piece at resistant high-pressure seal chamber, through main performance and the technological parameter of control coolant high-pressure gas or supercritical gas or, realizes complicated quenching technology. Particularly, environment-friendly nitrogen or air is used as a coolant, and the cooling rate of the workpiece is accurately controlled by adjusting the preheating and heat-preserving process parameters of the workpiece, the temperature, the pressure and the flow rate of the coolant, so that the cooling rate of the workpiece is close to an ideal cooling curve as far as possible.

The gas controllable cooling induction quenching device provided by the utility model can be used for quenching and bainite quenching of steel, QT500 and other alloys, thereby obtaining high hardness and fatigue resistance, and solving the link problem caused by using water, oil and nitrate in the existing heat treatment device; meanwhile, the energy and material consumption is saved, the production efficiency is improved, and the production cost is reduced.

The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims (10)

1. An induction hardening apparatus with controlled cooling of gas, comprising:

a preheating chamber (20) for preheating the workpiece (10);

a high pressure resistant sealed chamber (30) providing a heat treatment space for induction heating and cooling of the workpiece (10);

an induction coil spray sleeve (40) consisting of an induction coil (41) and a spray sleeve (42) which are spirally arranged side by side so as to rapidly perform induction heating and rapid cooling on the preheated workpiece (10);

a heat preservation furnace (50) for performing heat preservation treatment on the cooled workpiece (10); and

a gas supply system (60) for supplying high pressure gas or supercritical gas to the injector sleeve (42).

2. The induction hardening apparatus with controllable gas cooling according to claim 1, wherein the induction coil injection sleeve (40) is an integrated structure integrating induction heating and cooling injection, which is formed by spirally bending a double-hole copper pipe, and circulating cooling water is communicated in the copper pipe forming the induction coil (41); the inner side wall of the copper pipe forming the injection sleeve (42) is provided with a plurality of vent holes which are communicated with the air supply system (60).

3. The gas controlled cooling induction hardening apparatus according to claim 1, characterized in that a rotary table (43) and an infrared temperature sensor (44) are disposed at the position of the induction hardening station (C) within the induction coil injection sleeve (40), the infrared temperature sensor (44) being disposed on the surface of the workpiece (10), the workpiece (10) being placed on the rotary table (43).

4. The induction hardening apparatus with controlled gas cooling according to claim 1, characterized in that a post-preheating station (a), a pre-induction hardening station (B) and a pre-heat-preservation station (D) are arranged in sequence between the preheating chamber (20), the holding furnace (50) and the high pressure resistant sealed chamber (30).

5. The gas controlled cooling induction hardening apparatus according to claim 4, wherein the workpiece (10) is transferred by a robot between the post-preheating station (A), the pre-induction hardening station (B), the induction hardening station (C), and the pre-holding station (D).

6. The gas controlled cooling induction hardening apparatus according to claim 1, wherein the high pressure gas is high pressure air or high pressure nitrogen; the supercritical gas is supercritical air or supercritical nitrogen.

7. The gas controlled cooling induction hardening apparatus according to claim 1, wherein the gas supply system (60) is an air supply system (61) or a nitrogen supply system (62), which is prepared on-site from a booster pump or a nitrogen generator set.

8. The gas controlled cooling induction hardening apparatus according to claim 7, wherein said air supply system (61) comprises a first booster pump (611) and a first intermediate air tank (612) connected in series by a pipe, said first intermediate air tank (612) communicating with said injection sleeve (42) by a pipe to supply high pressure air to said injection sleeve (42).

9. The gas controlled cooling induction hardening apparatus according to claim 7, wherein the nitrogen gas supply system (62) includes a nitrogen generator set (621), a gas storage tank (623), a second booster pump (625), and a second intermediate gas storage tank (626) connected in sequence by pipes, wherein: the second intermediate air storage tank (626) is communicated with the injection sleeve (42) through a pipeline to provide high-pressure nitrogen or supercritical nitrogen for the injection sleeve (42).

10. The gas controlled cooling induction hardening apparatus according to claim 1, further comprising a PID controller electrically connected to the induction coil (41), the infrared temperature sensor (44), and the flow sensor, respectively.

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