Large current self-resistance heating device and method for variable cross-section blade blank

Abstract

The present invention belongs to the field of blade processing technology, and specifically discloses a large current self-resistance heating device and method for variable cross-section blade blanks, including a controller, a large current generator, a first circuit group, a second circuit group and a temperature detection unit, wherein the controller is respectively connected to the temperature detection unit and the large current generator; the large current generator is respectively electrically connected to the first circuit group and the second circuit group; the first circuit group is used to transmit current along the length direction of the tenon of the blade blank; the second circuit group is used to transmit current along the blade body direction of the blade blank; the temperature detection unit is used to detect the temperature of the blade surface. The above device can solve the problem that large current self-resistance heating cannot achieve uniform heating of variable cross-section blades.

Description

Technical Field

[0001] The invention belongs to the technical field of blade processing, and in particular relates to a large-current self-resistance heating device and method for variable-section blade blanks. Background Art

[0002] High current self-resistance heating is to apply current directly to the blank to quickly heat the blank with Joule heat. High current self-resistance heating has a high heating rate, which can reduce the time the material is exposed to the air during heating, improve surface defects caused by oxidation, speed up production cycles, and significantly reduce costs. High current self-resistance heating is usually used for rapid heating of rectangular plates or tubes.

[0003] During the blade production process, the blade needs to be heated. The blade body part of the blade blank is a rectangle with equal wall thickness, and the end is thickened and formed into a tenon. After the whole blank is hot-formed, it has the bent and twisted shape of the blade.

[0004] High current self-resistance heating has a high heating rate, but because the blade body and tenon of the blade have variable cross-sections, it is difficult to achieve an overall relatively uniform temperature field when high current self-resistance heating is performed on the variable cross-section blade blank. Summary of the invention

[0005] The object of the present invention is to provide a large current self-resistance heating device and method for variable cross-section blade blanks, so as to solve the problem that large current self-resistance heating cannot achieve uniform heating of variable cross-section blades.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a large-current self-resistance heating device for a variable-section blade blank, comprising a controller, a large-current generator, a first circuit group, a second circuit group and a temperature detection unit, wherein the controller is respectively connected to the temperature detection unit and the large-current generator; the large-current generator is respectively electrically connected to the first circuit group and the second circuit group; the first circuit group is used to transmit current along the length direction of the tenon of the blade blank; the second circuit group is used to transmit current along the blade body direction of the blade blank; the temperature detection unit is used to detect the temperature of the blade surface.

[0007] Furthermore, the first circuit group includes a first output wire, a first loop wire, and a first conductive sheet and a second conductive sheet for conducting electricity to both sides of the blade tenon, one end of the first output wire is connected to the positive pole of the large current generator, and the other end is electrically connected to the first conductive sheet, and the first output wire is connected to a first switch K1; one end of the first loop wire is connected to the negative pole of the large current generator, and the other end is electrically connected to the second conductive sheet, and the first loop wire is connected to a second switch K3.

[0008] Further, the second circuit group includes a second output wire, a second loop wire, a third loop wire, and a third conductive sheet, a fourth conductive sheet, and a fifth conductive sheet for conducting electricity toward the blade body direction, one end of the second output wire is connected to the positive electrode of the large current generator, and the other end is electrically connected to the third conductive sheet, and the second output wire is connected to a third switch K2; one end of the second loop wire is connected to the negative electrode of the large current generator, and the other end is electrically connected to the fourth conductive sheet, and the second loop wire is connected to a fourth switch K4; one end of the third loop wire is connected to the negative electrode of the large current generator, and the other end is electrically connected to the fifth conductive sheet, and the third loop wire is connected to a fifth switch K5; the third conductive sheet is used to conduct electricity toward the side of the blade body away from the tenon, and the fourth conductive sheet and the fifth conductive sheet are used to conduct electricity toward the side of the tenon away from the blade body.

[0009] Furthermore, the temperature detection unit includes six groups of detection parts for detecting surface temperature, and the six groups of detection parts are divided into three groups in pairs. The first group of detection parts and the second group of detection parts are used to detect the temperature of the blade body, and the third group of detection parts is used to detect the temperature on both sides of the tenon.

[0010] Furthermore, the detection element adopts a thermocouple temperature sensor or an infrared camera.

[0011] The present invention also provides a large current self-resistance heating method for a variable cross-section blade blank, comprising the following steps:

[0012] S1: Install the first conductive sheet and the second conductive sheet on both sides of the blade tenon, install the third conductive sheet on the side of the blade body away from the tenon, and install the fourth conductive sheet and the fifth conductive sheet on the side of the tenon away from the blade body; the first conductive sheet is electrically connected to the positive electrode of the large current generator, the second conductive sheet is electrically connected to the negative electrode of the large current generator, and the first conductive sheet, the second conductive sheet, the blade and the large current generator form a first circuit group; the third conductive sheet is connected to the positive electrode of the large current generator, the fourth conductive sheet and the fifth conductive sheet are respectively connected to the negative electrode of the large current generator, and the third conductive sheet, the fourth conductive sheet, the fifth conductive sheet, the large current generator and the blade form a second circuit group;

[0013] S2: Install the temperature detection unit on the blade, connect the controller to the temperature detection unit and the high current generator respectively, and set the temperature T on the controller. 设置 ;

[0014] S3: Connect the first circuit group and disconnect the second circuit group;

[0015] S4: The high current generator starts with an initial current I 初 Heat for a while;

[0016] S5: Determine whether the temperature detection unit is abnormal; if the temperature detection unit is abnormal, turn off the high current generator and diagnose the temperature detection unit;

[0017] S6: If the temperature detection unit is normal, determine whether the maximum heating rate of all detection points of the temperature detection unit is less than 15°C / s; if the maximum heating rate of all detection points is less than or equal to 15°C / s, proceed to step S7; if the maximum heating rate of all detection points is greater than 15°C / s, proceed to step S8;

[0018] S7: judge 1.2*I 初 ≥I 额 Is it established? 额 Represents the rated current of the large current generator; if true, then I 额 Set to heating current; if not, set 1.2*I 初 Set to heating current;

[0019] S8: Continue heating for a while;

[0020] S9: Judge T 任一检测点 ≥T 设置 +15℃ is it true, T 任一检测点 Indicates the temperature of any detection point of the temperature detection unit; if established, proceed to step S11, if not established, proceed to step S10;

[0021] S10: Judgment | T 所有检测点 -T 设置 |<15℃,T 所有检测点 Indicates the temperature of all detection points of the temperature detection unit; if established, the heating process ends; if not established, returns to step S5;

[0022] S11: changing the connection state between the first circuit group and the second circuit group;

[0023] S12: Repeat steps S4-S11 until the end.

[0024] Furthermore, the heating period in the above step S4 is 5 seconds.

[0025] Furthermore, the heating period in the above step S8 is 5 seconds.

[0026] The beneficial effects of the present technical solution are: ① A single large current generator is used to realize two-way time-sharing power heating, which can realize the heating of the thickened part of the blade tenon and meet the overall forming requirements of the blade blank; ② When switching the power direction, the conductive sheets do not need to be detached from the blade blank; ③ During the heating process, the controller will automatically adjust the current size and switch the current direction according to the changes in the temperature field, without the need for human intervention; ④ The present device and method can also continuously heat the blade blank that has formed a spatial curved surface shape after deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the front view of the blade blank when it is not heated;

[0028] Figure 2 for Figure 1 Side view of

[0029] Figure 3 This is the main view of the blade blank after thermoforming;

[0030] Figure 4 It is a schematic structural diagram of a large current self-resistance heating device for a variable cross-section blade blank according to the present invention for heating along the blade body direction;

[0031] Figure 5 It is a schematic structural diagram of a large current self-resistance heating device for a variable cross-section blade blank according to the present invention heating along the tenon direction;

[0032] Figure 6 The present invention is a flow chart of a large current self-resistance heating method for a variable cross-section blade blank. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific implementation methods:

[0034] The reference numerals in the drawings of the specification include: blade body 1, tenon 2, high current generator 3, blade 4, detection member 5, first conductive sheet 6, second conductive sheet 7, third conductive sheet 8, fourth conductive sheet 9, fifth conductive sheet 10.

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] Basically as attached Figure 1-5As shown: a large current self-resistance heating device for a variable-section blade blank includes a controller, a large current generator 3, a first circuit group, a second circuit group and a temperature detection unit, wherein the controller is respectively connected to the temperature detection unit and the large current generator 3; the large current generator 3 is respectively electrically connected to the first circuit group and the second circuit group; the first circuit group is used to transmit current along the length direction of the tenon 2 of the blade 4 blank; the second circuit group is used to transmit current along the blade body 1 direction of the blade 4 blank; and the temperature detection unit is used to detect the temperature of the surface of the blade 4.

[0038] The first circuit group includes a first output wire, a first loop wire, and a first conductive sheet 6 and a second conductive sheet 7 for conducting electricity to both sides of the tenon 2 of the blade 4. One end of the first output wire is connected to the positive electrode of the large current generator 3, and the other end is electrically connected to the first conductive sheet 6. The first output wire is connected to a first switch K1; one end of the first loop wire is connected to the negative electrode of the large current generator 3, and the other end is electrically connected to the second conductive sheet 7. The first loop wire is connected to a second switch K3.

[0039] The second circuit group includes a second output conductor, a second loop conductor, a third loop conductor, and a third conductive sheet 8, a fourth conductive sheet 9, and a fifth conductive sheet 10 for conducting electricity toward the blade 4 and the blade body 1. One end of the second output conductor is connected to the positive electrode of the large current generator 3, and the other end is electrically connected to the third conductive sheet 8. The second output conductor is connected to a third switch K2; one end of the second loop conductor is connected to the negative electrode of the large current generator 3, and the other end is electrically connected to the fourth conductive sheet 9, and the second loop conductor is connected to a fourth switch K4; one end of the third loop conductor is connected to the negative electrode of the large current generator 3, and the other end is electrically connected to the fifth conductive sheet 10, and the third loop conductor is connected to a fifth switch K5; the third conductive sheet 8 is used to conduct electricity toward the side of the blade body 1 away from the tenon 2, and the fourth conductive sheet 9 and the fifth conductive sheet 10 are used to conduct electricity toward the side of the tenon 2 away from the blade body 1.

[0040] The temperature detection unit includes six groups of detection members 5 for detecting the surface temperature. The six groups of detection members 5 are divided into three groups in pairs. The first group of detection members 5 and the second group of detection members 5 are used to detect the temperature of the blade body 1, and the third group of detection members 5 are used to detect the temperature of both sides of the tenon 2. The detection member 5 uses a thermocouple temperature sensor or an infrared camera. In this embodiment, a thermocouple temperature sensor is used.

[0041] In this embodiment, the first conductive sheet 6, the second conductive sheet 7, the third conductive sheet 8, the fourth conductive sheet 9 and the fifth conductive sheet 10 are all made of copper plates with a thickness of 10 mm, and can be fixed to the blade 4 by bolts or pneumatic clamps. The fixing method is the existing technology and will not be repeated in this technical solution.

[0042] Embodiment 2

[0043] Basically as attached Figure 1-6 As shown, the large current self-resistance heating method of the variable cross-section blade blank comprises the following steps:

[0044] S1: Install the first conductive sheet 6 and the second conductive sheet 7 on both sides of the tenon 2 of the blade 4, install the third conductive sheet 8 on the side of the blade body 1 of the blade 4 away from the tenon 2, and install the fourth conductive sheet 9 and the fifth conductive sheet 10 on the side of the tenon 2 away from the blade body 1; the first conductive sheet 6 is electrically connected to the positive electrode of the large current generator 3, the second conductive sheet 7 is electrically connected to the negative electrode of the large current generator 3, and the first conductive sheet 6, the second conductive sheet 7, the blade 4 and the large current generator 3 form a first circuit group; the third conductive sheet 8 is connected to the positive electrode of the large current generator 3, the fourth conductive sheet 9 and the fifth conductive sheet 10 are respectively connected to the negative electrode of the large current generator 3, and the third conductive sheet 8, the fourth conductive sheet 9, the fifth conductive sheet 10, the large current generator 3 and the blade 4 form a second circuit group;

[0045] S2: Install the temperature detection unit on the blade, connect the controller to the temperature detection unit and the high current generator 3 respectively, and set the set temperature T on the controller. 设置 ;

[0046] S3: Connect the first circuit group and disconnect the second circuit group;

[0047] S4: The high current generator 3 is operated with an initial current I 初 Heat for a while;

[0048] S5: Determine whether the temperature detection unit is abnormal; if the temperature detection unit is abnormal, turn off the high current generator 3 and diagnose the temperature detection unit;

[0049] S6: If the temperature detection unit is normal, determine whether the maximum heating rate of all detection points of the temperature detection unit is less than 15°C / s; if the maximum heating rate of all detection points is less than or equal to 15°C / s, proceed to step S7; if the maximum heating rate of all detection points is greater than 15°C / s, proceed to step S8;

[0050] S7: judge 1.2*I 初 ≥I 额 Is it established? 额 represents the rated current of the large current generator 3; if it is established, I 额 Set to heating current; if not, set 1.2*I 初 Set to heating current;

[0051] S8: Continue heating for a while;

[0052] S9: Judge T 任一检测点 ≥T 设置 +15℃ is it true, T 任一检测点Indicates the temperature of any detection point of the temperature detection unit; if established, proceed to step S11, if not established, proceed to step S10;

[0053] S10: Judgment | T 所有检测点 -T 设置 |<15℃,T 所有检测点 Indicates the temperature of all detection points of the temperature detection unit; if established, the heating process ends; if not established, returns to step S5;

[0054] S11: changing the connection state between the first circuit group and the second circuit group;

[0055] S12: Repeat steps S4-S11 until the end.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A high current self-resistance heating method for variable cross-section blade blanks, characterized in that: A large current self-resistance heating device is used for heating, and the large current self-resistance heating device includes a controller, a large current generator, a first circuit group, a second circuit group and a temperature detection unit, wherein the controller is respectively connected to the temperature detection unit and the large current generator; the large current generator is respectively electrically connected to the first circuit group and the second circuit group; the first circuit group is used to transmit current along the length direction of the tenon of the blade blank; the second circuit group is used to transmit current along the blade body direction of the blade blank; the temperature detection unit is used to detect the temperature of the blade surface; the first circuit group includes a first output wire, a first loop wire, and a first conductive sheet and a second conductive sheet for conducting electricity to both sides of the blade tenon, one end of the first output wire is connected to the positive electrode of the large current generator, and the other end is electrically connected to the first conductive sheet, and the first output wire is connected to a first switch K1; one end of the first loop wire is connected to the negative electrode of the large current generator, and the other end is electrically connected to the negative electrode of the large current generator. The first circuit conductor is electrically connected to the second conductive sheet at one end, and the second switch K3 is connected to the first circuit conductor; the second circuit group includes a second output conductor, a second circuit conductor, a third circuit conductor, and a third conductive sheet, a fourth conductive sheet, and a fifth conductive sheet for conducting electricity toward the blade body direction, one end of the second output conductor is connected to the positive electrode of the large current generator, and the other end is electrically connected to the third conductive sheet, and the second output conductor is connected to the third switch K2; one end of the second circuit conductor is connected to the negative electrode of the large current generator, and the other end is electrically connected to the fourth conductive sheet, and the second circuit conductor is connected to the fourth switch K4; one end of the third circuit conductor is connected to the negative electrode of the large current generator, and the other end is electrically connected to the fifth conductive sheet, and the third circuit conductor is connected to the fifth switch K5; the third conductive sheet is used to conduct electricity toward the side of the blade body away from the tenon, and the fourth conductive sheet and the fifth conductive sheet are used to conduct electricity toward the side of the tenon away from the blade body; The heating method comprises the following steps: S1: Install the first conductive sheet and the second conductive sheet on both sides of the blade tenon, install the third conductive sheet on the side of the blade body away from the tenon, and install the fourth conductive sheet and the fifth conductive sheet on the side of the tenon away from the blade body; the first conductive sheet is electrically connected to the positive electrode of the large current generator, the second conductive sheet is electrically connected to the negative electrode of the large current generator, and the first conductive sheet, the second conductive sheet, the blade and the large current generator form a first circuit group; the third conductive sheet is connected to the positive electrode of the large current generator, the fourth conductive sheet and the fifth conductive sheet are respectively connected to the negative electrode of the large current generator, and the third conductive sheet, the fourth conductive sheet, the fifth conductive sheet, the large current generator and the blade form a second circuit group; S2: Install the temperature detection unit on the blade, connect the controller to the temperature detection unit and the high current generator respectively, and set the temperature T on the controller. 设置 ; S3: Connect the first circuit group and disconnect the second circuit group; S4: The high current generator starts with an initial current I 初 Heat for a while; S5: Determine whether the temperature detection unit is abnormal; if the temperature detection unit is abnormal, turn off the high current generator and diagnose the temperature detection unit; S6: If the temperature detection unit is normal, determine whether the maximum heating rate of all detection points of the temperature detection unit is less than 15°C / s; if the maximum heating rate of all detection points is less than or equal to 15°C / s, proceed to step S7; if the maximum heating rate of all detection points is greater than 15°C / s, proceed to step S8; S7: judge 1.2*I 初 ≥I 额 Is it established? 额 Represents the rated current of the large current generator; if true, then I 额 Set to heating current; if not, set 1.2*I 初 Set to heating current; S8: Continue heating for a while; S9: Judge T 任一检测点 ≥T 设置 +15℃ is it true, T 任一检测点 Indicates the temperature of any detection point of the temperature detection unit; if established, proceed to step S11, if not established, proceed to step S10; S10: Judgment | T 所有检测点 -T 设置 |<15℃,T 所有检测点 Indicates the temperature of all detection points of the temperature detection unit; if established, the heating process ends; if not established, returns to step S5; S11: changing the connection state between the first circuit group and the second circuit group; S12: Repeat steps S4-S11 until the end.

2. The large current self-resistance heating method for variable cross-section blade blanks according to claim 1 is characterized in that: The temperature detection unit includes six groups of detection pieces for detecting surface temperature, and the six groups of detection pieces are divided into three groups in pairs. The first group of detection pieces and the second group of detection pieces are used to detect the temperature of the blade body, and the third group of detection pieces are used to detect the temperature on both sides of the tenon.

3. The large current self-resistance heating method for variable cross-section blade blanks according to claim 2 is characterized in that: The detection element adopts a thermocouple temperature sensor or an infrared camera.

4. The large current self-resistance heating method for variable cross-section blade blanks according to claim 1 is characterized in that: The heating period in the above step S4 is 5 seconds.

5. The large current self-resistance heating method for variable cross-section blade blanks according to claim 1 is characterized in that: The heating period in the above step S8 is 5 seconds.

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