Local induction heating middle upsetting forging forming method for battery pole piece roller
Through local induction heating and intermediate upset forging, the problems of low material output rate and waste of energy in the forging of battery pole sheet rolls are solved, and efficient and low-cost forging production are achieved.
Patent Information
- Application Number
- CN202411649581.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-03-07
AI Technical Summary
In the prior art, when forging battery pole rolls, it is difficult to avoid adding forging residual blocks and caulking table material separation, resulting in low material output rate, waste of energy and high oxidation losses of raw materials.
The blank is preheated by local induction heating, and only local heating is performed on the roller body position, intermediate upsetting is performed and the overall heating is completed to the initial forging temperature to complete the forging shape of the roller.
The demand for forging residual blocks and cab tables is reduced, the material output rate and roll quality are improved, and energy consumption and production costs are reduced.
Smart Images
Figure CN119566187A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of free forging, in particular to a battery pole piece roller local induction heating intermediate upsetting forging forming method. Background Art
[0002] Since the battery electrode roller has a large roller body diameter and short length, and a small roller neck diameter and light weight, this special size structure makes forging difficult. When using the ordinary drawing method, it is necessary to increase the forging block to ensure the length of the card table material division in order to draw the roller neck, which will reduce the ingot yield rate. When using the local upsetting forming method, it is necessary to undergo two overall heatings before local upsetting, and it is necessary to draw and card the blank in advance before the local upsetting conditions are met. This will cut off the forging flow line, cause energy waste, and cause a lot of oxidation loss of raw materials. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a method for local induction heating intermediate upsetting forging of battery electrode rollers. Compared with the ordinary drawing production method, it does not need to increase the forging surplus blocks, does not need to divide the materials by clamping tables, and improves the yield rate; compared with the local upsetting forming production method, it reduces one overall heating, and does not need to draw in advance or clamping tables to make blanks, thus ensuring the continuity of the forging streamline, improving the quality of the rollers, and reducing energy consumption.
[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A battery pole piece roller local induction heating intermediate upsetting forging forming method comprises the following steps: Step 1, preheating the blank as a whole; Step 2, heating the blank only at the roller body position by induction heating; Step 3, performing intermediate upsetting on the locally heated portion of the blank, and then stretching the upset portion to a size larger than the roller body diameter; Step 4, heating the blank after the intermediate upsetting and stretching to the initial forging temperature as a whole; Step 5: Lengthen the roller body to the process size, lengthen the roller necks at both ends to the process size, and trim.
[0005] A further improvement of the technical solution of the present invention is that in step 1, the overall preheating of the blank refers to heating from room temperature to 750°C to 900°C.
[0006] A further improvement of the technical solution of the present invention is that: in step 2, the induction heating is performed in an induction coil group; the induction coil group is composed of a plurality of induction coils connected in parallel.
[0007] A further improvement of the technical solution of the present invention is that during induction heating, the length of the blank to be heated needs to be calculated based on the weight of the battery electrode roller body, and the loading position of the blank in the induction heating furnace and the number of induction coils to be used are determined based on the length.
[0008] A further improvement of the technical solution of the present invention is that in step 2, the heating temperature is the initial forging temperature of the blank.
[0009] A further improvement of the technical solution of the present invention is that the initial forging temperature is between 1150°C and 1250°C.
[0010] A further improvement of the technical solution of the present invention is that in step 3, an upper blind hole upsetting plate and a lower blind hole upsetting plate are used for intermediate upsetting, the upsetting ratio is greater than 1.8, and after upsetting, the roller is drawn to a size greater than the process size of the roller body.
[0011] A further improvement of the technical solution of the present invention is that the drawing ratio from the drawn dimension after upsetting to the process dimension of the roller body is greater than 1.3.
[0012] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: 1. The present invention adopts an induction heating method to achieve local heating of the blank, and performs intermediate upsetting forging of the local heating position into a roller body. After heating again, the roller body and the roller necks at both ends are forged to complete the forging of the battery pole piece roller; this method further optimizes the forging production of the battery pole piece roller.
[0013] 2. Compared with the common drawing production method, the present invention does not need to add forging blocks, does not need to divide the materials by clamping table, and improves the material yield.
[0014] 3. Compared with the local upsetting production method, the forging forming method provided by the present invention reduces the overall heating once, and does not require early drawing and blanking, thereby ensuring the continuity of the forging streamline, improving the quality of the rolling mill, and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor. Figure 1 Schematic diagram of a battery pole piece roll forging according to an embodiment of the present invention; Figure 2 Schematic diagram of local induction heating of a blank in an embodiment of the present invention; Figure 3Schematic diagram of the intermediate upsetting process of the blank in an embodiment of the present invention; Among them, 1. induction coil group; 2. blank; 2-1. first blank non-heating zone; 2-2. blank heating zone; 2-3. second blank non-heating zone; 3. upper blind hole upsetting plate; 4. lower blind hole upsetting plate; 5. first roll neck; 6. roll body; 7. second roll neck. DETAILED DESCRIPTION
[0016] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.
[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0019] The present invention is further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1-3 As shown, a battery pole piece roller local induction heating intermediate upsetting forging forming method specifically includes the following steps: Step 1: preheat the whole blank 2 to 750-900°C in a gas-fired heating furnace. Figure 2 As shown, the blank 2 is usually cylindrical, and the average diameter of the blank 2 is Φ500mm~Φ700mm. The diameter of the blank 2 is smaller than the inner diameter of the induction heating coil in the induction coil group 1. The weight of the blank 2 is determined according to the weight of the battery electrode roller.
[0020] Step 2, loading the preheated blank 2 into the induction coil assembly 1, determining the length of the blank heating zone 2-2, the length of the first blank non-heating zone 2-1 and the length of the second blank non-heating zone 2-3 according to the weight of the roll body 5 and the first roll neck 4 and the second roll neck 6, calculating the number of induction heating coils to be used according to the length of the blank heating zone 2-2, adjusting the position of the blank 2 in the induction coil assembly 1, turning on the induction heating coil at the corresponding position of the blank heating zone 2-2, and heating the blank in the blank heating zone 2-2 to the initial forging temperature, which is 1150° C. to 1250° C.; Step 3, such as Figure 3 As shown, the blank 2 is erected, the lower end of the non-heating zone 2-1 of the first blank is placed in the lower blind hole upsetting plate 4, and the upper part of the non-heating zone 2-3 of the second blank is covered with the blind hole upsetting plate 3. The press is pressed to perform intermediate upsetting on the heating zone 2-2 of the blank, and the upsetting ratio is greater than 1.8. After the upsetting is completed, the blank 2 is hoisted out and the heating zone 2-2 of the blank is stretched to a size larger than the roller body diameter Φ2; the stretching ratio from the stretched size after upsetting to the roller body process size is greater than 1.3.
[0021] Step 4, placing the blank 2 after the intermediate upsetting and elongation into a gas-fired heating furnace and heating the blank as a whole to an initial forging temperature of 1150° C. to 1250° C.; Step 5. Press Figure 1 In the schematic diagram of the roll forging, the billet 2 is drawn, the roll body 5 is drawn to the process size, the first roll neck 4 and the second roll neck 6 at both ends are drawn to the process size, trimmed, and completed.
[0022] The above method can realize the intermediate upsetting forging of the battery pole piece roller by induction heating of the local blank, improve the roller product quality and reduce the production cost.
[0023] Example 1 This embodiment uses a battery pole piece roller local induction heating intermediate upsetting forging forming method, the forging structure is as follows Figure 1 The battery pole piece roller shown in the figure has Φ1=400mm, Φ2=800mm, Φ3=400mm. L1=650mm, L2=920mm, L3=800mm. The production steps are as follows: Step 1, such as Figure 1 The battery pole sheet roll shown has a product weight of about 5.1 t, and the required blank 2 has a weight of about 5.6 t. The diameter of the blank 2 is 650 mm and the length is 2150 mm. First, the blank 2 is loaded into a gas-fired heating furnace and preheated to 850°C.
[0024] Step 2, such as Figure 2As shown, the preheated blank 2 is loaded into the induction coil group 1. According to the weight of the roll body 5, the length of the blank heating zone 2-2 can be determined to be 1500mm, and 5 induction heating coils are required. According to the weight of the first roll neck 4, the length of the first blank non-heating zone 2-1 can be determined to be 300mm. According to the weight of the second roll neck 6, the length of the second blank non-heating zone 2-3 can be determined to be 350mm. According to the length dimensions of the first blank non-heating zone 2-1, the blank heating zone 2-2 and the second blank non-heating zone 2-3, the positions of the induction heating coils (3), (4), (5), (6) and (7) corresponding to the blank heating zone 2-2 are adjusted to heat the blank heating zone 2-2 to the initial forging temperature of 1200°C; Step 3: After heating is completed, press Figure 3 Schematic diagram, the blank 2 is erected, the lower end of the non-heating zone 2-1 of the first blank is placed in the lower blind hole upsetting plate 4, the upper part of the non-heating zone 2-3 of the second blank is covered with the blind hole upsetting plate 3, the press is pressed to perform intermediate upsetting on the heating zone 2-2 of the blank, the upsetting is upset to Φ1100mm, the blank 2 is lifted out, and the heating zone 2-2 of the blank is stretched to Φ920mm; Step 4, placing the blank 2 after intermediate upsetting and elongation into a gas-fired heating furnace and heating the blank as a whole to a starting forging temperature of 1200° C.; Step 5. Press Figure 1 In the schematic diagram of the roll forging, the billet 2 is stretched, the roll body 5 is stretched to Φ800mm, the first roll neck 4 and the second roll neck 6 at both ends are stretched to Φ400mm, trimmed, and completed.
[0025] Example 2 This embodiment uses a battery pole piece roller local induction heating intermediate upsetting forging forming method, the forging structure is as follows Figure 1 The battery pole piece roll shown in the figure has Φ1=350mm, Φ2=700mm, Φ3=380mm. L1=500mm, L2=680mm, L3=550mm. The production steps are as follows: Step 1, such as Figure 1 The product weight of the battery pole sheet roll shown is about 2.9 t, and the required weight of the blank 2 is about 3.3 t. The diameter of the blank 2 is Φ550 mm and the length is 1750 mm. The blank 2 is loaded into a gas-fired heating furnace and preheated to 800°C.
[0026] Step 2, such as Figure 2As shown, the preheated blank 2 is loaded into the induction coil group 1. According to the weight of the roll body 6, the length of the blank heating zone 2-2 can be determined to be 1200mm, and 4 induction heating coils are required. According to the weight of the first roll neck 4, the length of the first blank non-heating zone 2-1 can be determined to be 250mm. According to the weight of the second roll neck 6, the length of the second blank non-heating zone 2-3 can be determined to be 300mm. According to the length dimensions of the first blank non-heating zone 2-1, the blank heating zone 2-2 and the second blank non-heating zone 2-3, the positions of the induction heating coils (3), (4), (5) and (6) of the blank heating zone 2-2 are adjusted to heat the blank heating zone 2-2 to the initial forging temperature of 1170°C; Step 3: After heating is completed, press Figure 3 Schematic diagram, the blank 2 is erected, the lower end of the non-heating zone 2-1 of the first blank is placed in the lower blind hole upsetting plate 4, the upper part of the non-heating zone 2-3 of the second blank is covered with the blind hole upsetting plate 3, the press is pressed to perform intermediate upsetting on the heating zone 2-2 of the blank, the upsetting is performed to Φ950mm, the blank 2 is lifted out, and the heating zone 2-2 of the blank is stretched to Φ820mm; Step 4, the blank 2 after the intermediate upsetting and elongation is placed in a gas-fired heating furnace and heated as a whole to the initial forging temperature of 1170° C.; Step 5. Press Figure 1 In the schematic diagram of the roll forging, the billet 2 is stretched, the roll body 5 is stretched to Φ700mm, the first roll neck 4 is stretched to Φ350mm, the second roll neck 6 is stretched to Φ380mm, trimmed, and completed.
[0027] The above two embodiments complete the intermediate upsetting forging of the battery pole piece roller by induction heating of the local blank, thereby improving product quality and reducing production costs.
[0028] In summary, the local induction heating intermediate upsetting forging forming method of a battery pole piece roller provided by the present invention is mainly used for forging battery pole piece roller forgings, which is realized by a local induction heating method and an intermediate upsetting forging forming method adapted thereto; further optimizes the forging production of the battery pole piece roller; ensures the continuity of the forging streamline, improves the quality of the roller product, and reduces energy consumption.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A battery pole piece roller local induction heating intermediate upsetting forging forming method, characterized in that: The following steps are involved: Step 1, preheating the blank as a whole; Step 2, heating the blank only at the roller body position by induction heating; Step 3, performing intermediate upsetting on the locally heated portion of the blank, and then stretching the upset portion to a size larger than the roller body diameter; Step 4, heating the blank after the intermediate upsetting and stretching to the initial forging temperature as a whole; Step 5: Lengthen the roller body to the process size, lengthen the roller necks at both ends to the process size, and trim.
2. A battery pole piece roller local induction heating intermediate upsetting forging forming method according to claim 1, characterized in that: In step 1, the overall preheating of the blank refers to heating from room temperature to 750° C. to 900° C.
3. The method for forming a battery pole piece by local induction heating intermediate upsetting forging according to claim 1, characterized in that: In step 2, the induction heating is performed in an induction coil group; the induction coil group is composed of a plurality of induction coils connected in parallel.
4. A battery pole piece roller local induction heating intermediate upsetting forging forming method according to claim 3, characterized in that: During induction heating, the length of the blank to be heated must be calculated based on the weight of the battery electrode roller body, and the loading position of the blank in the induction heating furnace and the number of induction coils to be used must be determined based on the length.
5. The battery pole piece roll local induction heating intermediate upsetting forging method according to claim 1, characterized in that: In step 2, the heating temperature is the initial forging temperature of the billet.
6. A battery pole piece roller local induction heating intermediate upsetting forging forming method according to claim 5, characterized in that: The initial forging temperature is between 1150°C and 1250°C.
7. The battery pole piece roll local induction heating intermediate upsetting forging forming method according to claim 1, characterized in that: In step 3, an upper blind hole upsetting plate and a lower blind hole upsetting plate are used for intermediate upsetting, the upsetting ratio is greater than 1.8, and after upsetting, the roller is drawn to a size greater than the process size of the roller body.
8. A battery pole piece roller local induction heating intermediate upsetting forging forming method according to claim 7, characterized in that: The drawing ratio from the drawn dimension after upsetting to the process dimension of the roller body is greater than 1.3.