A method for optimizing the sawing process of superconducting composite ingots

Abstract

The invention discloses a method for optimizing the sawing process of a superconducting composite ingot, which relates to the technical field of superconducting material processing, and comprises the following steps: transporting the superconducting composite ingot to a sawing tool; starting from the head and tail end faces of the superconducting composite ingot, gradually performing head-to-tail synchronous sawing; after each head-to-tail synchronous sawing, respectively performing core wire uniformity identification on the head and tail end faces of the superconducting composite ingot; when the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces are no longer sawed, and the total sawing length of the head end face and the total sawing length of the tail end face are recorded respectively as the theoretical total sawing length; and the same type of superconducting composite ingots to be sawed are sawed according to the theoretical total sawing length. The present application improves work efficiency through head-to-tail synchronous sawing; through core wire uniformity identification, the sawing length can be judged based on the core wire uniformity, thereby improving sawing accuracy and yield rate, and being able to meet the requirements of mass sawing production.

Description

Technical Field

[0001] The present application relates to the technical field of superconducting material processing, and in particular to a method for optimizing a superconducting composite ingot sawing process. Background Art

[0002] Superconducting composite ingots are metal-based composite materials (the core wires of superconducting composite ingots currently used in large-scale production are generally NbTi and Nb3Sn superconducting composite materials, and the metal matrix is ​​generally copper-based). During the extrusion process of superconducting composite ingots, due to the different metal fluidity between copper and superconducting materials, there is an uneven area at the head and tail of the extruded superconducting composite ingot. The uneven area at the head and tail is also different for superconducting composite ingots of different structural types. Therefore, it is necessary to saw the uneven area of ​​the superconducting ingot batch after extrusion.

[0003] In the prior art, Chinese patent CN117457283A discloses a method for preparing a superconducting composite rod, a superconducting composite rod and a superconducting wire, wherein the preparation method comprises: bundling a plurality of single core rods and loading them into a copper tube to form a composite ingot; heating the composite ingot; selecting an extrusion cylinder according to the required diameter; and reversely extruding the heated composite ingot using the extrusion cylinder to obtain a superconducting composite rod.

[0004] The current superconducting composite ingot sawing process can generally only saw from one end of the superconducting composite ingot. After the head end face is sawed, the superconducting composite ingot is turned 180 degrees to saw the tail end face, which has poor work efficiency. At the same time, the current superconducting composite ingot sawing process usually determines the sawing length according to manual experience. When the sawing does not meet the requirements after one sawing, it is still sawed again according to the sawing length determined by manual experience, which will cause material waste, and the sawing accuracy and yield are low. However, the above-mentioned prior art has not studied or solved the above problems and cannot meet the requirements of mass sawing production. Summary of the invention

[0005] The present application provides a method for optimizing the sawing process of superconducting composite ingots, which is used to solve the problems in the prior art that the sawing process of superconducting composite ingots has poor working efficiency, low sawing accuracy and low yield, and cannot meet the requirements of mass sawing production.

[0006] On the one hand, the present application provides a method for optimizing a superconducting composite ingot sawing process, comprising the following steps:

[0007] Step 1: transport the superconducting composite ingot to be sawed after extrusion to the sawing tool, adjust the position and prepare for sawing.

[0008] Step 2: Using the sawing tool, starting from the head and tail end surfaces of the superconducting composite ingot, and gradually performing head-to-tail synchronous sawing according to a preset first sawing length.

[0009] Step three, after each head-tail synchronous sawing, the core wire uniformity is identified on the head and tail end faces of the superconducting composite ingot.

[0010] When the core wire uniformity of any end face is less than the preset qualified uniformity, the end face will no longer be sawed.

[0011] When the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces are no longer sawed, and the total sawing length of the head end face and the total sawing length of the tail end face are recorded respectively as the theoretical total sawing length of the same type of superconducting composite ingot to be sawed.

[0012] Step 4: sawing the same type of superconducting composite ingots to be sawed according to the theoretical total sawing length.

[0013] In a possible implementation, the sawing tool includes: a head end face sawing machine and a tail end face sawing machine, and the head end face sawing machine and the tail end face sawing machine are both arranged on a slide rail.

[0014] In a possible implementation, in step three, when the core wire uniformity of any end face is less than a preset first uniformity and greater than or equal to the qualified uniformity, the sawing length of the end face is modified to a preset second sawing length.

[0015] The second sawing length is smaller than the first sawing length.

[0016] In a possible implementation, in step three, the core wire uniformity identification adopts a core wire identification technology based on image pixels.

[0017] In a possible implementation, in step 3, the core fiber recognition technology based on image pixels includes:

[0018] The head and tail end faces of the superconducting composite ingot are photographed respectively to obtain end face image pixels.

[0019] The area of ​​each core wire in the end surface is obtained according to the end surface image pixels.

[0020] The core wire uniformity is obtained according to the area of ​​each core wire, as shown in the following formula: δ=(S max -S min ) / S ave , where δ represents the uniformity of the core wire, S max Indicates the maximum core area, S min Indicates the minimum core area, S ave Represents the average core area.

[0021] In a possible implementation, in step 4, after the same type of superconducting composite ingots to be sawed are sawed according to the theoretical total sawing length, the core wire uniformity of the head and tail end faces is identified again.

[0022] Determine whether to saw again based on the uniformity of the core wire at the head and tail ends.

[0023] In a possible implementation, in step 4, judging whether to perform sawing again according to the uniformity of the core wire at the head and tail end faces includes:

[0024] If the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces will no longer be sawed.

[0025] If the core wire uniformity of any end face is greater than or equal to the preset qualified uniformity, the end face is sawn again.

[0026] A superconducting composite ingot sawing process optimization method in this application has the following advantages:

[0027] The work efficiency is improved by synchronous sawing at the head and tail; the sawing length can be judged based on the uniformity of the core wire through the identification of the uniformity of the core wire, which improves the sawing accuracy and yield rate. Under the premise of improving the work efficiency, sawing accuracy and yield rate, the theoretical total sawing length is obtained, and the same type of superconducting composite ingots to be sawed are sawed according to the theoretical total sawing length, which can meet the requirements of mass sawing production.

[0028] It is proposed that when the core wire uniformity of any end face is less than a preset first uniformity and greater than or equal to a qualified uniformity, the sawing length of the end face is modified to a preset second sawing length, and the second sawing length is less than the first sawing length. By making the sawing length change with the change of the core wire uniformity, material waste caused by manual experience in determining the sawing length is avoided, and the sawing accuracy and yield rate are further improved.

[0029] The proposed core wire identification technology based on image pixels includes: taking pictures of the head and tail end faces of the superconducting composite ingot respectively to obtain the end face image pixels, obtaining the area of ​​each core wire in the end face according to the end face image pixels, and obtaining the core wire uniformity according to the area of ​​each core wire, thereby improving the rationality and accuracy of core wire uniformity identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic flow chart of a method for optimizing a superconducting composite ingot sawing process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Embodiment 1:

[0034] like Figure 1 As shown, the embodiment of the present application provides a method for optimizing the sawing process of a superconducting composite ingot, comprising the following steps:

[0035] Step 1: transport the superconducting composite ingot to be sawed after extrusion to the sawing tool, adjust the position and prepare for sawing.

[0036] Step 2: Using the sawing tool, starting from the head and tail end surfaces of the superconducting composite ingot, and gradually performing head-to-tail synchronous sawing according to a preset first sawing length.

[0037] Step three, after each head-tail synchronous sawing, the core wire uniformity is identified on the head and tail end faces of the superconducting composite ingot.

[0038] When the core wire uniformity of any end face is less than the preset qualified uniformity, the end face will no longer be sawed.

[0039] When the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces are no longer sawed, and the total sawing length of the head end face and the total sawing length of the tail end face are recorded respectively as the theoretical total sawing length of the same type of superconducting composite ingot to be sawed.

[0040] Step 4: sawing the same type of superconducting composite ingots to be sawed according to the theoretical total sawing length.

[0041] Exemplarily, the sawing tool comprises: a head end face sawing machine and a tail end face sawing machine, and the head end face sawing machine and the tail end face sawing machine are both arranged on a slide rail.

[0042] Specifically, both the head end face sawing machine and the tail end face sawing machine adopt existing sawing machines, and sawing knives are arranged on the sawing machines. The head end face sawing machine is used to saw the head end face of the superconducting composite ingot, and the tail end face sawing machine is used to saw the tail end face of the superconducting composite ingot. The head end face sawing machine and the tail end face sawing machine are both movable by setting the slide rail, so as to realize synchronous sawing of the head and the tail. In this embodiment, the sliding of the head end face sawing machine and the tail end face sawing machine is realized by hydraulic rods.

[0043] Exemplarily, in step three, when the core wire uniformity of any end face is less than a preset first uniformity and greater than or equal to the qualified uniformity, the sawing length of the end face is modified to a preset second sawing length.

[0044] The second sawing length is smaller than the first sawing length.

[0045] Specifically, in this embodiment, the first sawing length is set to 50 mm, the first uniformity is set to 0.06, the second sawing length is set to 10 mm, and the qualified uniformity is set to 0.05.

[0046] In other possible embodiments, the first sawing length, the first uniformity, the second sawing length, and the qualified uniformity may also be adaptively set to other values ​​according to actual conditions.

[0047] Exemplarily, in step three, the core wire uniformity identification adopts a core wire identification technology based on image pixels.

[0048] Exemplarily, in step 3, the core fiber recognition technology based on image pixels includes:

[0049] The head and tail end faces of the superconducting composite ingot are photographed respectively to obtain end face image pixels.

[0050] The area of ​​each core wire in the end surface is obtained according to the end surface image pixels.

[0051] The core wire uniformity is obtained according to the area of ​​each core wire, as shown in the following formula: δ=(S max -S min ) / S ave , where δ represents the uniformity of the core wire, S max Indicates the maximum core area, S min Indicates the minimum core area, S ave Represents the average core area.

[0052] Specifically, in this embodiment, the area of ​​each core filament is represented by the number of pixels corresponding to each core filament in the end face image pixel.

[0053] Exemplarily, in step 4, after the same type of superconducting composite ingots to be sawed are sawed according to the theoretical total sawing length, the core wire uniformity of the head and tail end faces is identified again.

[0054] Determine whether to saw again based on the uniformity of the core wire at the head and tail ends.

[0055] Exemplarily, in step 4, judging whether to perform sawing again according to the uniformity of the core wire at the head and tail end faces includes:

[0056] If the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces will no longer be sawed.

[0057] If the core wire uniformity of any end face is greater than or equal to the preset qualified uniformity, the end face is sawn again.

[0058] Specifically, in this embodiment, the superconducting composite ingot to be sawed after extrusion is a 17-core composite ingot (a superconducting composite ingot assembled from 17 superconducting core wire components) with a specification of 42 mm in diameter×1.2 m in length.

[0059] After sawing the 17-core composite ingot in steps one to three using the superconducting composite ingot sawing process optimization method in this embodiment, the total sawing length of the head end face is 270 mm, and the total sawing length of the tail end face is 230 mm. At this time, the core wire uniformity of the head and tail end faces is less than 0.05.

[0060] In this embodiment, the total sawing length of the head end face is 270 mm, and the total sawing length of the tail end face is 230 mm as the theoretical total sawing length. The same type of 17-core composite ingots are sawn according to the theoretical total sawing length, of which 97% of the 17-core composite ingots are qualified after one sawing (the core wire uniformity of the head and tail end faces is less than 0.05), and the remaining 17-core composite ingots are qualified after the second sawing, that is, a maximum of two sawings can ensure that 100% of the 17-core composite ingots have qualified uniformity.

[0061] Compared with the prior art in which the head end face of the 17-core composite ingot is generally sawed by 350-400 mm and the tail end face is sawed by 300-350 mm, the sawing yield of Example 1 is improved by 0.8%-1.2%.

[0062] Embodiment 2:

[0063] The difference between Example 2 and Example 1 is that the superconducting composite ingot to be sawed after extrusion in Example 2 is a 32-core composite ingot (a superconducting composite ingot assembled from 32 superconducting core wire components) with a specification of 58 mm in diameter × 1.5 m in length, and the remaining steps and parameters are the same as those in Example 1.

[0064] The final total sawing length of the head end face is 290 mm, and the total sawing length of the tail end face is 250 mm. At this time, the core wire uniformity of the head and tail end faces is less than 0.05.

[0065] In this embodiment, the total sawing length of the head end face is 290 mm, and the total sawing length of the tail end face is 250 mm as the theoretical total sawing length. The same type of 32-core composite ingots are sawn according to the theoretical total sawing length, of which 98% of the 32-core composite ingots are qualified after one sawing (the core wire uniformity of the head and tail end faces is less than 0.05), and the remaining 32-core composite ingots are qualified after the second sawing, that is, a maximum of two sawings can ensure that 100% of the 32-core composite ingots have qualified uniformity.

[0066] Compared with the prior art in which the head end face of a 32-core composite ingot is generally sawed by 300-400 mm and the tail end face is sawed by 300-350 mm, the sawing yield of Example 2 is increased by 0.6%-1.0%.

[0067] Embodiment 3:

[0068] The difference between Example 3 and Example 1 is that the superconducting composite ingot to be sawed after extrusion in Example 3 is a 25-core composite ingot (a superconducting composite ingot assembled from 25 superconducting core wire components) with a specification of 68 mm in diameter × 2.5 m in length, and the remaining steps and parameters are the same as those in Example 1.

[0069] The final total sawing length of the head end face is 310 mm, and the total sawing length of the tail end face is 240 mm. At this time, the core wire uniformity of the head and tail end faces is less than 0.05.

[0070] In this embodiment, the total sawing length of the head end face is 310 mm, and the total sawing length of the tail end face is 240 mm as the theoretical total sawing length. The same type of 25-core composite ingots are sawn according to the theoretical total sawing length, of which 98% of the 25-core composite ingots are qualified after one sawing (the core wire uniformity of the head and tail end faces is less than 0.05), and the remaining 25-core composite ingots are qualified after the second sawing, that is, a maximum of two sawings can ensure that 100% of the 25-core composite ingots are qualified in uniformity.

[0071] Compared with the prior art in which the head end face of a 25-core composite ingot is generally sawed by 350 mm and the tail end face is sawed by 280 mm, the sawing yield of Example 3 is improved by 0.7%-0.9%.

[0072] The embodiment of the present application improves work efficiency by sawing synchronously at the head and tail; by identifying the uniformity of the core wire, the sawing length can be judged based on the uniformity of the core wire, thereby improving the sawing accuracy and yield rate. Under the premise of improving work efficiency, sawing accuracy and yield rate, the theoretical total sawing length is obtained, and the same type of superconducting composite ingots to be sawed are sawed according to the theoretical total sawing length, which can meet the requirements of mass sawing production.

[0073] It is proposed that when the core wire uniformity of any end face is less than a preset first uniformity and greater than or equal to a qualified uniformity, the sawing length of the end face is modified to a preset second sawing length, and the second sawing length is less than the first sawing length. By making the sawing length change with the change of the core wire uniformity, material waste caused by manual experience in determining the sawing length is avoided, and the sawing accuracy and yield rate are further improved.

[0074] The proposed core wire identification technology based on image pixels includes: taking pictures of the head and tail end faces of the superconducting composite ingot respectively to obtain the end face image pixels, obtaining the area of ​​each core wire in the end face according to the end face image pixels, and obtaining the core wire uniformity according to the area of ​​each core wire, thereby improving the rationality and accuracy of core wire uniformity identification.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for optimizing the sawing process of a superconducting composite ingot, characterized in that: The following steps are involved: Step 1, transporting the superconducting composite ingot to be sawed after extrusion to the sawing tool, adjusting the position and preparing for sawing; Step 2, using the sawing tool to start from the head and tail end surfaces of the superconducting composite ingot and gradually perform head and tail synchronous sawing according to a preset first sawing length; Step 3, after each head-tail synchronous sawing, the head and tail end faces of the superconducting composite ingot are respectively subjected to core wire uniformity identification; When the core wire uniformity of any end face is less than the preset qualified uniformity, the end face will no longer be sawed; When the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces are no longer sawed, and the total sawing length of the head end face and the total sawing length of the tail end face are recorded respectively as the theoretical total sawing length of the same type of superconducting composite ingot to be sawed; Step 4, sawing the same type of superconducting composite ingots to be sawed according to the theoretical total sawing length; In step 3, the core wire uniformity recognition adopts the core wire recognition technology based on image pixels; In step 3, the core fiber recognition technology based on image pixels includes: Taking photos of the head and tail end faces of the superconducting composite ingot respectively to obtain end face image pixels; Obtaining the area of ​​each core wire in the end face according to the end face image pixels; The core wire uniformity is obtained according to the area of ​​each core wire, as shown in the following formula: δ=(S max -S min ) / S ave , where δ represents the uniformity of the core wire, S max Indicates the maximum core area, S min Indicates the minimum core area, S ave Represents the average core area.

2. A superconducting composite ingot sawing process optimization method according to claim 1, characterized in that: The sawing tool comprises: a head end face sawing machine and a tail end face sawing machine, and the head end face sawing machine and the tail end face sawing machine are both arranged on a slide rail.

3. The method for optimizing superconducting composite ingot sawing process according to claim 1, characterized in that: In step three, when the core wire uniformity of any end face is less than the preset first uniformity and greater than or equal to the qualified uniformity, the sawing length of the end face is modified to the preset second sawing length; The second sawing length is smaller than the first sawing length.

4. The method for optimizing superconducting composite ingot sawing process according to claim 1, characterized in that: In step 4, after sawing the same type of superconducting composite ingots to be sawed according to the theoretical total sawing length, the core wire uniformity of the head and tail end faces is identified again; Determine whether to saw again based on the uniformity of the core wire at the head and tail ends.

5. A superconducting composite ingot sawing process optimization method according to claim 4, characterized in that: In step 4, judging whether to perform sawing again according to the uniformity of the core wire at the head and tail end faces includes: If the core wire uniformity of the head and tail end faces is less than the preset qualified uniformity, the head and tail end faces will no longer be sawed; If the core wire uniformity of any end face is greater than or equal to the preset qualified uniformity, the end face is sawn again.

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