A dual-power heating fixture for batch heat treatment

Abstract

The present invention discloses a dual-power heating fixture capable of batch heat treatment, comprising a DC heating unit, an induction heating unit, an air cooling unit, and a water cooling unit. The DC heating unit is composed of a lower base, an upper disc seat, and a clamping unit mounted on the lower base and the upper disc seat. On the one hand, the clamping unit can be used to achieve batch clamping of rod-shaped or plate-shaped specimens. On the other hand, DC heating of the specimens is achieved by energizing the lower base and the upper disc seat with a thermal simulation device. Simultaneously, the present application also designs an induction heating unit to achieve dual-power heating. An air cooling unit is integrated into the induction heating unit for jet cooling of the specimens. A water cooling unit is disposed between the lower base, the upper disc seat, and the induction heating unit; it is used to cool the lower base and the upper disc seat and also to cool the coil of the induction heating unit itself. Therefore, the fixture designed in the present application can achieve dual-power heating of DC heating and induction heating, and can also achieve batch clamping of rod-shaped or plate-shaped specimens.

Description

Technical Field

[0001] The present invention relates to the technical field of material thermal processing, and in particular to a dual-power heating fixture capable of batch heat treatment. Background Art

[0002] A heat treatment process is a process that heats, insulates, and cools metal (conductive) materials to obtain specific structures and properties, thereby meeting the machining and use requirements of the materials. The samples obtained by the heat treatment process should have a large uniform temperature area and a large number of samples to ensure subsequent mechanical property testing and microstructure analysis, and then evaluate the rationality of the heat treatment system. Currently, universities, enterprises, or research institutes usually use muffle furnaces or thermal simulation equipment to obtain samples for heat treatment tests, but the use of these two types of equipment has the following shortcomings:

[0003] 1. The use of a muffle furnace can obtain a larger sample with a uniform temperature zone and can process multiple samples at the same time. However, the heating rate of the muffle furnace is slow, the cooling rate is difficult to accurately control, and the range of heating rate and cooling rate control is small;

[0004] 2. Using thermal simulation equipment can achieve accurate control of heating and cooling rates and a wide range of cooling and heating rates, but it cannot obtain a large uniform temperature zone and can only process one sample at a time;

[0005] 3. Whether using a muffle furnace or a thermal simulation test machine, it is impossible to obtain the continuous cooling transformation curve (CCT curve) of supercooled austenite of metal materials at different cooling rates at one time. Summary of the Invention

[0006] In order to address the deficiencies in the prior art, the present application proposes a dual-power heating fixture capable of batch heat treatment, which can realize dual-power heating of DC heating and induction heating, and can also realize batch clamping of rod-shaped or plate-shaped samples.

[0007] The technical solutions adopted in the present invention are as follows:

[0008] A dual-power heating fixture capable of batch heat treatment, comprising:

[0009] A DC heating unit comprising a lower base, an upper plate seat, and a clamping unit arranged relative to each other; the clamping unit is detachably mounted on each of the lower base and the upper plate seat, and the sample is fixed between the lower base and the upper plate seat by the clamping unit; the lower base and the upper plate seat are each provided with an electrode column connected to a thermal simulation device; the lower base, the upper plate seat, and the clamping unit are made of conductive material;

[0010] An induction heating unit, comprising an induction coil assembly, the induction coil assembly being disposed between the lower base and the upper disc base, the induction coil assembly being connected to an AC power supply; the induction coil assembly being spirally disposed and being sheathed around the outside of the sample;

[0011] The air cooling unit includes a perforated jet cooler, which is made of a pipe with multiple evenly distributed air outlet holes; the perforated jet cooler is provided with an air pipe inlet, through which gas is input into the perforated jet cooler, and the input gas is ejected from the air outlet holes on the perforated jet cooler;

[0012] The water cooling unit includes a cooling water channel and a cooling water pipe. The cooling water channels are respectively arranged on the lower base and the upper disc base, and the cooling water channels between the lower base and the upper disc base are connected by the cooling water pipe.

[0013] Furthermore, the air cooling unit is fixedly mounted on the inner wall surface of the induction coil assembly, and the air outlet holes on the perforated air jet cooler face the side where the sample is located.

[0014] Furthermore, the induction coil assembly includes an inductor, a negative power terminal and a positive power terminal, and the inductor is spirally arranged in multiple layers with equal spacing; the inductor is hollow in design, and the interior is an inductor circulating water channel.

[0015] Furthermore, a diversion hole is provided on the upper disc seat, which corresponds to the cooling water path and is interconnected. The two ends of the induction coil assembly are respectively connected to the diversion holes on the upper disc seat, thereby realizing the connection between the cooling water path and the inductor circulating water channel, and cooling and dissipating the heat of the coil itself.

[0016] Furthermore, limiting surfaces for the clamping unit are provided on both the lower base and the upper disc seat, and a pair of limiting surfaces are provided and arranged opposite to each other; a T-shaped slide is provided at the bottom between the limiting surfaces; the T-shaped slide is connected to the bottom of the limiting surface on one side and disconnected from the limiting surface on the other side; a tightening threaded through hole is provided in the horizontal direction on the limiting surface not connected to the T-shaped slide, and a bolt can be installed in the tightening threaded through hole.

[0017] Furthermore, the clamping unit includes a pressing plate and at least one pad, and the sample is fixed between the pressing plate and the pad.

[0018] Furthermore, both the pressure plate and the pad are provided with slide grooves, which cooperate with the T-shaped slideway through the slide grooves.

[0019] Furthermore, the vertical surface on one side of the pressure plate is a plane, which is arranged toward the tightening threaded through hole on the limit surface; the other side is a working surface; the working surface is provided with multiple vertical arc concave surfaces parallel to each other, and the adjacent vertical arc concave surfaces are planes; both sides of the pad are working surfaces, which are the same as the working surface of the pressure plate.

[0020] Furthermore, the number of pads is increased according to the length of the limiting surface, thereby increasing the number of samples that are heat-treated simultaneously.

[0021] Beneficial effects of the present invention:

[0022] 1. The present invention has the characteristics of dual power supply heating, and can use single power heating or induction heating, or both can be used for mixed heating to achieve heating effects in different application scenarios.

[0023] 2. The present invention can batch clamp multiple rod-shaped or plate-shaped specimens, has low requirements on specimen size, and has no special processing requirements on the specimen clamping end. It is simple and convenient to operate and easy to install.

[0024] 3. The induction coil assembly is equipped with a perforated air jet cooler to achieve a cooling effect. The hole distribution of the perforated air jet cooler can be designed as a single-side hole distribution or a circumferential hole distribution. When used in conjunction with different heating methods, different batch heat treatment effects can be achieved. For example:

[0025] The electric heating is adopted, and the perforated air jet cooler is designed with single-side holes. The middle section of the sample has the same peak temperature. During cooling, it is cooled by a unidirectional cooling medium. The cooling rate of the sample close to the air jet hole is high, and vice versa. Thus, heat treatment effects with different cooling rates can be achieved, which is suitable for CTT curve (continuous cooling transformation curve of supercooled austenite) test.

[0026] Induction heating is adopted, and the perforated jet cooler is designed with annular holes. The peak temperature of the sample in the middle section close to the outer circle sensor is high, and vice versa. During cooling, the samples are cooled by the annular cooling medium, and the cooling effect of each sample is the same. The heat treatment effect of the same cooling rate at different peak temperatures can be achieved, which is suitable for isothermal cooling tests.

[0027] 4. The present invention uses the thermal simulation device as a carrier and the fixture as a technical means to obtain a larger temperature uniformity zone (40mm×50mm×50mm), which meets the processing requirements of the subsequent mechanical properties test specimen size and microscopic test specimen size. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the fixture;

[0029] Figure 2 This is a schematic diagram of the lower base of the fixture;

[0030] Figure 3 This is a schematic diagram of the upper disc seat of this fixture;

[0031] Figure 4 Schematic diagram of the pressure plate of this fixture;

[0032] Figure 5 This is a schematic diagram of the pad of this fixture;

[0033] Figure 6 This is a schematic diagram of the coil assembly of this fixture;

[0034] Figure 7 This is a schematic diagram of the use of this fixture.

[0035] In the figure, 1, lower base; 1-1, positioning hole; 1-2, cooling water channel; 1-3, water channel port expansion hole; 1-4, T-type slideway; 1-5, fastening threaded hole; 1-6, limit surface; 1-7, electrode column; 2, pressure plate; 2-1, pressure plate small plane; 2-2, pressure plate cylindrical surface; 2-3, pressure plate slideway; 2-4, pressure plate large plane; 3, cooling water pipe; 4, pad; 4-1, pad small plane; 4-2, pad cylindrical surface Cylinder; 4-3, spacer slide; 5, plug; 6, upper plate seat; 6-1, diverter hole; 7, quick male connector; 8, induction coil assembly; 8-1, sensor; 8-2, power supply negative terminal; 8-3, sensor circulating water inlet; 8-4, air pipe inlet; 8-5, jet cooler with holes; 8-6, sensor circulating water outlet; 8-7, power supply positive terminal; 9, specimen; 10, bolt; 11, quick female connector. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] A dual-power heating fixture capable of batch heat treatment comprises a direct current heating unit, an induction heating unit, an air cooling unit, and a water cooling unit.

[0038] The following is a detailed description of the structure of each unit:

[0039] 1. DC heating unit

[0040] The DC heating unit includes a lower base 1 , an upper disc base 6 , and a clamping unit detachably mounted on the lower base 1 and the upper disc base 6 .

[0041] The structure of the lower base 1 is as follows Figure 2As shown, a limiting surface 1-6 for the clamping unit is provided on the upper portion of the lower base 1. The limiting surfaces 1-6 are provided in a pair and are arranged opposite to each other; a T-shaped slide 1-4 is provided at the bottom between the limiting surfaces 1-6. The T-shaped slide 1-4 is connected to the bottom of the limiting surface 1-6 on one side and is disconnected from the limiting surface 1-6 on the other side, leaving a gap of a certain width to facilitate the removal of the clamping unit from the T-shaped slide 1-4. A tightening threaded through hole 1-5 is provided in the horizontal direction on the limiting surface 1-6 that is not connected to the T-shaped slide 1-4. A bolt 10 can be installed in the tightening threaded through hole 1-5. By adjusting the relative position of the bolt 10, the clamping unit on the T-shaped slide 1-4 can be clamped.

[0042] The bottom of the lower base 1 is provided with electrode columns 1-7, which can cooperate with the energized electrode slots of the thermal simulation device.

[0043] like Figure 3 As shown, the upper disc seat 6 has the same structure as the lower base 1 , the upper disc seat 6 is located on the upper part of the lower base 1 and the limiting surfaces 1 - 6 of the two are arranged oppositely, and the sample to be processed is placed between the upper disc seat 6 and the lower base 1 .

[0044] The clamping unit includes a pad 4 and a pressing plate 2, and the pressing plate 2 and the pad 4 are used to fix the sample to be processed. Figure 4 The bottom of the pressure plate 2 is provided with a pressure plate slot 2-3, which cooperates with the T-shaped slide 1-4. One side of the pressure plate 2 has a flat vertical surface, facing the tightening threaded through-hole 1-5 on the limit surface 1-6; the other side is a working surface, which is provided with multiple parallel vertical arc surfaces. More specifically, the vertical arc surface of the pressure plate 2 is called the pressure plate cylindrical surface 2-2, the plane between adjacent pressure plate cylindrical surfaces 2-2 is the pressure plate small surface 2-1, and the top of the pressure plate 2 is the pressure plate large surface 2-4.

[0045] Combined with attachment Figure 5 Both sides of the pad 4 are working surfaces, so the working surface of the pad 4 is provided with multiple mutually parallel vertical arc surfaces. More specifically, the vertical arc surfaces of the pad 4 are called pad cylindrical surfaces 4-2, and the plane between adjacent pad cylindrical surfaces 4-2 is the pad facet 4-1.

[0046] Since the lower base 1, the upper disk seat 6 and the pad 4 are made of materials with good electrical conductivity, good thermal conductivity and good processing performance, the lower base 1 and the upper disk seat 6 can realize DC heating of the sample 9 after the thermal simulation equipment is energized through the electrode columns 1-7.

[0047] 2. Induction heating unit

[0048] The induction heating unit includes an induction coil assembly 8, which includes an inductor 8-1, a negative power terminal 8-2, and a positive power terminal 8-7. Inductor 8-1 is arranged in multiple layers and arranged in an evenly spaced spiral pattern. One end of inductor 8-1 is provided with a negative power terminal 8-2, and the other end is provided with a positive power terminal 8-7. These terminals connect inductor 8-1 to the positive and negative poles of an external AC power source, typically at a frequency of 100 kHz, enabling induction heating.

[0049] 3. Air cooling unit

[0050] The air cooling unit includes a perforated jet cooler 8-5, which is used to control the cooling of the sample 9. The perforated jet cooler 8-5 is made of a pipe with multiple evenly distributed air outlets. The perforated jet cooler 8-5 is equipped with only an air pipe inlet 8-4, through which cooling gas is input into the perforated jet cooler 8-5 and ejected from the air outlets on the perforated jet cooler 8-5.

[0051] In this embodiment, the air cooling unit is arranged in the inner ring of the induction coil assembly 8. For example, the perforated jet cooler 8-5 is fixed to the inner side of the inductor 8-1 by welding, and the air outlet on the perforated jet cooler 8-5 is arranged toward the inner ring of the induction coil assembly 8.

[0052] In this embodiment, the cooling gas medium can be selected according to actual cooling needs, for example, helium, nitrogen, etc. Different cooling effects can be achieved by using different cooling gas media.

[0053] 4. Water cooling unit

[0054] The water cooling unit includes a cooling water channel 1-2 and a cooling water pipe 3. In this embodiment, the cooling water channel 1-2 is set on the lower base 1 and the upper disc base 6; multiple cooling water channels 1-2 can be set on the lower base 1 or the upper disc base 6. Figure 2 As shown, the multiple cooling water channels 1-2 can be parallel or perpendicular to each other. A water channel port expansion hole 1-3 is set at the end of each cooling water channel 1-2, and can be equipped with a plug 5; the plug 5 can be screwed into the water channel port expansion hole 1-3 to close the cooling water channel 1-2.

[0055] Cooling water pipe 3 connects the cooling water paths 1-2 on the lower base 1 and upper disc base 6, transferring cooling water between the two, forming a complete cooling system. A quick male connector 7 or a quick female connector 11 can be installed at the end of cooling water pipe 3. These connectors connect to the cooling water storage and recovery unit.

[0056] More preferably, in this application, to improve the compactness of the entire fixture structure, the air cooling unit and water cooling unit are integrated into the induction heating unit. More specifically, a diverter hole 6-1 is provided on the upper disc seat 6. The diverter hole 6-1 corresponds to and is interconnected with the cooling water path 1-2. Circulating cooling water is connected to the inductor circulating water inlet 8-3 through the diverter hole 6-1, and then is directed back into the upper disc seat 6 from the inductor circulating water outlet 8-6 to cool and dissipate heat for the coil itself. The apertures of the inductor circulating water inlet 8-3 and the inductor circulating water outlet 8-6 are 6-8 mm.

[0057] The air cooling unit is arranged inside the induction coil assembly 8 and is used to control the cooling of the sample 9 .

[0058] More preferably, the diameter of the cooling water channel 1-2 is 4-6 mm; the diameter of the cooling water pipe 3 is 6-8 mm, and the length is not less than 220 mm.

[0059] More preferably, the dimensions of the perforated jet cooler 8-5 are 6 mm in outer diameter and 1.5 mm in thickness; the diameter of the air outlet holes on the inner side of the cooler coil is 1 mm and they are distributed at intervals of 5 mm.

[0060] More preferably, the inner circle area of the spiral sensor 8-1 has a size of 40mm×50mm×50mm, and the outer diameter of a single sensor 8-1 is 8mm and the thickness is 1.5mm.

[0061] More preferably, the material of the lower base 1, the upper disc base 6, the pad 4 and the induction coil assembly 8 is preferably copper, and other materials that can achieve the same function can also be replaced.

[0062] More preferably, the cooling water pipe material can be made of polyvinyl chloride, and other materials that can achieve the same function can also be replaced.

[0063] More preferably, the combination of the pad 4 and the pressing plate 2 can realize the clamping of rod-shaped or plate-shaped samples 9; in addition, the number of pads 4 between the pressing plates 2 can be increased to realize batch clamping of samples 9.

[0064] More preferably, the surfaces of the pressure plate facet 2-1, the pressure plate large facet 2-4, the pad facet 4-1 and the pad cylindrical surface 4-2 have knurling or reticulation, which can increase friction to clamp the sample.

[0065] More preferably, positioning holes 1-1 can be further provided on the lower base 1 and the upper disc seat 6, and the lower base 1 and the upper disc seat 6 can be fixedly connected to the thermal simulation device respectively by using the positioning holes 1-1; the diameter of the positioning holes 1-1 is 6-8 mm.

[0066] More preferably, the electrode columns 1-7 on the lower base 1 and the upper disc seat 6 have a diameter of 22 mm and a height of 10 mm. The specific size can be adjusted according to the size of the connection end on the thermal simulation device.

[0067] More preferably, the bolts 10 for locking the clamping unit on the lower base 1 and the upper disc base 6 can be selected from M5 to M8 and 45 to 60 mm in length. Suitable sizes can also be selected according to actual assembly requirements.

[0068] More preferably, the cooling water pipe 3 is made of a transparent or translucent material with good electrical insulation, acid and alkali resistance, high temperature resistance and wear resistance, such as polyvinyl chloride.

[0069] More preferably, the upper end surfaces of the sensor circulating water inlet 8-3 and the sensor circulating water outlet 8-6 have a plastic insulating layer to prevent interference with the direct current on the upper disc seat 6.

[0070] In this embodiment, the specimen 9 can be a strip, such as one with a length of 80 mm to 180 mm, a width of 5 mm to 60 mm, and a thickness not exceeding 5 mm; or a bar with a diameter of 5 mm to 8 mm. Furthermore, by optimizing the dimensions of the working surfaces of the spacer 4 and the pressure plate 2, specimens 9 of varying sizes can be accommodated, not limited to the dimensions of the specimen 9 described in this embodiment.

[0071] The following describes the working process of the fixture in detail using five metal strip specimens with a length of 180 mm, a width of 50 mm, and a thickness of 1.5 mm as original samples.

[0072] 1. Insert the electrode column of the base into the energized electrode slot of the thermal simulation device, and fix the base to the upper and lower disc seats of the thermal simulation device with bolts;

[0073] 2. Connect the quick male connector and quick female connector of the fixture in series to the cooling water branch of the thermal simulation equipment so that the cooling water can circulate in the fixture lower base, upper plate base and induction coil assembly;

[0074] 3. Weld a thermocouple at the center of the length and width of one of the bar or strip specimens. The diameter of the thermocouple should be 0.2 to 0.5 mm.

[0075] 4. Install two 10mm thick pads on the T-shaped slideway of the base, and alternately overlap the three plate strip specimens and the pads. The innermost plate strip contacts the limit surface of the base. Then install the pressure plate on the outermost side of the T-shaped slideway of the base to press the plate strip specimen and the pads. Turn the bolts clockwise to tighten the pressure plate, plate strip specimen and pads.

[0076] 5. Connect the positive and negative poles of the external (or thermal simulation test machine) high-frequency AC power supply to the positive and negative terminals of the induction coil assembly, connect the solenoid valve that controls the cooling medium of the thermal simulation test machine to the air pipe inlet of the jet cooler with holes, and connect the other end of the thermocouple welded to the specimen to the terminal of the temperature control device of the thermal simulation equipment;

[0077] 6. Prepare the heat treatment process on the control system of the thermal simulation equipment, and use electric, induction, or mixed methods for heating, insulation or cooling.

[0078] The above embodiments are intended only to illustrate the design concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. A dual-power heating fixture capable of batch heat treatment, characterized in that: include: A direct current heating unit, the direct current heating unit comprising a lower base (1), an upper disk seat (6) and a clamping unit arranged relatively to each other; the lower base (1) and the upper disk seat (6) are both detachably provided with a clamping unit, and a sample (9) is fixed between the lower base (1) and the upper disk seat (6) by the clamping unit; the lower base (1) and the upper disk seat (6) are both provided with electrode columns (1-7) connected to a thermal simulation device; the lower base (1), the upper disk seat (6) and the clamping unit are made of conductive materials; An induction heating unit, the induction heating unit comprising an induction coil assembly (8), the induction coil assembly (8) being arranged between a lower base (1) and an upper disc base (6), the induction coil assembly (8) being connected to an AC power supply; the induction coil assembly (8) being spirally arranged, and the induction coil assembly (8) being sheathed outside a sample (9); An air cooling unit, comprising a perforated jet cooler (8-5), the perforated jet cooler (8-5) being made of a pipe with a plurality of evenly distributed air outlets; the perforated jet cooler (8-5) being provided with an air pipe inlet (8-4), gas being input into the perforated jet cooler (8-5) through the air pipe inlet (8-4), and the input gas being ejected from the air outlets on the perforated jet cooler (8-5); A water cooling unit, the water cooling unit comprising a cooling water path (1-2) and a cooling water pipe (3), wherein the cooling water paths (1-2) are respectively provided on the lower base (1) and the upper disc base (6), and the cooling water pipe (3) is used to connect the cooling water path (1-2) between the lower base (1) and the upper disc base (6); The air cooling unit is fixedly mounted on the inner wall surface of the induction coil assembly (8), and the air outlet on the perforated jet cooler (8-5) faces the side where the sample (9) is located; A limiting surface (1-6) for a clamping unit is provided on both the lower base (1) and the upper disc base (6), and a pair of limiting surfaces (1-6) are provided and are arranged opposite to each other; a T-shaped slideway (1-4) is provided at the bottom between the limiting surfaces (1-6); the T-shaped slideway (1-4) is connected to the bottom of the limiting surface (1-6) on one side and is disconnected from the limiting surface (1-6) on the other side; a tightening threaded through hole (1-5) is provided in the horizontal direction on the limiting surface (1-6) not connected to the T-shaped slideway (1-4), and a bolt (10) is installed in the tightening threaded through hole (1-5).

2. A dual-power heating fixture capable of batch heat treatment according to claim 1, characterized in that: The induction coil assembly (8) comprises an inductor (8-1), a negative power terminal (8-2) and a positive power terminal (8-7), wherein the inductor (8-1) is spirally arranged in multiple layers at equal intervals; the inductor (8-1) is hollow in design, and an inductor circulating water flow channel is provided inside.

3. A dual-power heating fixture capable of batch heat treatment according to claim 2, characterized in that: A diversion hole (6-1) is provided on the upper disc seat (6), the diversion hole (6-1) corresponds to the cooling water path (1-2) and is interconnected, and both ends of the induction coil assembly (8) are respectively connected to the diversion hole (6-1) on the upper disc seat (6), thereby achieving the connection between the cooling water path (1-2) and the inductor circulating water flow channel, thereby cooling and dissipating the heat of the coil itself.

4. The dual-power heating fixture capable of batch heat treatment according to claim 1, characterized in that: The clamping unit comprises a pressing plate (2) and at least one pad (4), and a specimen (9) is fixed between the pressing plate (2) and the pad (4).

5. A dual-power heating fixture capable of batch heat treatment according to claim 4, characterized in that: The pressing plate (2) and the cushion block (4) are both provided with slide grooves, which cooperate with the T-shaped slideways (1-4) through the slide grooves.

6. The dual-power heating fixture capable of batch heat treatment according to claim 1, characterized in that: The fixing threaded through hole (1-5) is arranged toward the limiting surface (1-6); the other side is a working surface; the working surface is provided with a plurality of mutually parallel vertical arc concave surfaces, and the space between adjacent vertical arc concave surfaces is a plane; both sides of the pad (4) are working surfaces, which are the same as the working surface of the pressure plate (2).

7. The dual-power heating fixture capable of batch heat treatment according to claim 1, characterized in that: According to the length of the limiting surface (1-6), the number of the spacers (4) is increased, and the number of the specimens (9) to be heat-treated simultaneously is increased.

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