Magnetic core base cold forging process

Abstract

The application belongs to the technical field of cold forging and particularly relates to a magnetic core base cold forging process, which comprises the following steps: S1: blanking process, blanking after cutting by a disc saw; S2: shot blasting process, shot blasting by a drum shot blasting machine; S3: high polymer lubrication process, lubrication processing by coating lubrication wire; S4: pre-extrusion process, processing by a cold forging machine; S5: pre-forging process, processing by a cold forging machine; S6: pre-forging blank annealing, hardness is less than or equal to 120 HB; S7: pre-forging blank shot blasting, same as the step S2; S8: high polymer lubrication, same as the step S3; and S9: final forging. The magnetic core base cold forging process of the field camping refrigerator has the beneficial effects that in the magnetic core base cold forging process of the field camping refrigerator, the upper part of the blank is first extruded, and the blank groove is formed by 60%-70%, in the extrusion process, a part of the lower part is protruded, the blank is turned over, the two ends of the blank are extruded, the blank is formed by 90%, and finally, the final forging and final inspection are performed after appropriate adjustment according to the size, so that the magnetic core base cold forging processing yield is improved.

Description

Technical Field

[0001] This invention relates to the field of cold forging technology, specifically to the cold forging process of magnetic core bases. Background Technology

[0002] With the rise in popularity of camping activities, outdoor camping refrigerators have become an essential piece of camping equipment. These refrigerators are primarily used to store food and beverages, keeping them fresh and cool in the wild. They are typically made of sturdy and durable materials, capable of withstanding harsh outdoor conditions. The bottom of the refrigerator is equipped with a magnetic core base, which is manufactured using a cold forging process. However, the yield rate of cold-forged magnetic core bases for outdoor camping refrigerators needs improvement.

[0003] Therefore, it is necessary to invent a cold forging process for magnetic core bases. Summary of the Invention

[0004] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: The cold forging process for the magnetic core base includes the following steps: S1: Material cutting process, using a circular saw to cut the material; S2: Shot blasting process, using a drum shot blasting machine; S3: Polymer lubrication process, using coated lubrication lines for lubrication processing; S4: Pre-extrusion process, processed using a cold forging machine; S5: Pre-forging process, processed using a cold forging machine; S6: Annealing of the pre-forged billet to make the hardness of the pre-forged billet ≤120HB; S7: Shot blasting of pre-forged billets, the same as step S2; S8: Polymer lubricant, same as step S3; S9: Final forging.

[0005] Preferably, step S1 includes the following steps: S11: Made of φ37.2 cold-drawn bright round bar; S12: Use a circular saw to remove the head and tail of the material; S13: The end face of the bright round bar stock should be deburred to ≤0.3mm, and large burrs should be removed.

[0006] Preferably, step S2 includes the following steps: S21: Load material into the drum shot blasting machine. The stainless steel shot inside the drum shot blasting machine has a diameter of 0.3mm. S22: Use a drum shot blasting machine to start shot blasting, shot blasting time 15 minutes, current 20±3A; S23: The number of pieces shot blasted per cycle by a drum shot blasting machine is ≤500; S24: After shot blasting, there should be a rust-proof bag in the material frame to place the shot-blasted billet, ensuring that the appearance is clean and free of impurities.

[0007] Preferably, step S3 includes the following steps: S31: Water washing, the billet is washed with water, wherein the actual temperature of the heat exchanger is 130±20℃, the actual temperature of the hot water tank is 90±10℃, the actual temperature of the lubrication tank is 70±10℃, and the actual temperature of the drying is 110±10℃. S32: Lubrication, lubrication process begins with a coated lubrication line, lubrication tank concentration: refractometer measurement 6%-8%, lubrication tank conductivity 40-50mS; S33: Lubricating film weight: 0.03-0.055g, take 5 samples and measure the average value; S34: When the billet comes out of the drying area, it cannot be put directly into the material frame. A rust-proof bag needs to be placed in the material frame to ensure that the billet is clean and free of impurities. It should be lubricated and used on the same day.

[0008] Preferably, step S4 includes the following steps: S41: Install pre-extrusion molds and pre-extrude using a 650-ton cold forging machine; S42: First, extrude from the top of the billet. The billet groove is formed to 60%-70%. During the extrusion process, a part of the bottom will bulge out. S43: Cold forging machine speed control ratio 750 rpm; S44: Set the sealing height for the first test piece to 750.5, and then adjust it appropriately according to the size of the first piece.

[0009] Preferably, step S5 includes the following steps: S51: Install pre-forging molds and pre-forge using a 650-ton cold forging machine; S52: Turn the blank over and squeeze both ends of the blank to shape the blank to 90%; S53: Cold forging machine speed control ratio 750 rpm; S54: The initial test sealing height is set to 748, and then adjusted appropriately according to the initial piece size.

[0010] Preferably, the billet is cold-forged to an appropriate size and then undergoes final forging and final inspection.

[0011] Preferably, LUB632 is used as the lubricant and deionized water is used.

[0012] Preferably, lubricant should be added if any of the following occurs: refractometer reading is out of tolerance, conductivity is out of tolerance, film weight is out of tolerance, or the lubricant level in the lubrication tank cannot submerge the blank.

[0013] Preferably, when lubricating the polymer blank, if the liquid concentration is too high, add deionized water first; if the liquid concentration is too low, add lubricant first. After the liquid concentration is within a reasonable range, add water and lubricant in a 1:1 ratio.

[0014] Compared with existing technologies: In the cold forging process of the magnetic core base of the outdoor camping refrigerator, the blank is first extruded from the top until the blank groove is 60%-70% formed. During the extrusion process, a part of the bottom will bulge out. The blank is then turned over and the two ends of the blank are extruded to make the blank 90% formed. Finally, after appropriate adjustment according to the size, the final forging and final inspection are carried out to improve the yield of the cold forging process of the magnetic core base. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the blank of the present invention; Figure 2 This is a cross-sectional view of the pre-extruded billet of the present invention; Figure 3 This is a cross-sectional view of the pre-forged billet of the present invention; Figure 4 This is a diagram of the final forging process of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0017] like Figures 1-4 ; Includes the following steps: S1: Material cutting process, using a circular saw to cut the material; S2: Shot blasting process, using a drum shot blasting machine; S3: Polymer lubrication process, using coated lubrication lines for lubrication processing; S4: Pre-extrusion process, processed using a 650-ton cold forging machine; S5: Pre-forging process, processed using a 650-ton cold forging machine; S6: Annealing of the pre-forged billet to make the hardness of the pre-forged billet ≤120HB; S7: Shot blasting of pre-forged billets, the same as step S2; S8: Polymer lubricant, same as step S3; S9: Final forging; S1 includes the following steps: S11: Made of φ37.2 cold-drawn bright round bar; S12: Use a circular saw to remove the head and tail of the material; S13: The end face of the bright round bar stock shall be deburred to ≤0.3mm. Large burrs shall be removed. The first piece of the blank shall be inspected and qualified before mass production can begin. S2 includes the following steps: S21: Load material into the drum shot blasting machine. The stainless steel shot inside the drum shot blasting machine has a diameter of 0.3mm. S22: Use a drum shot blasting machine to start shot blasting, shot blasting time 15 minutes, current 20±3A; S23: The number of pieces shot blasted per cycle by a drum shot blasting machine is ≤500; S24: After shot blasting, there must be a rust-proof bag in the material frame to place the shot-blasted billet and ensure that the appearance is clean and free of impurities. S3 includes the following steps: S31: Water washing, the billet is washed with water, wherein the actual temperature of the heat exchanger is 130±20℃, the actual temperature of the hot water tank is 90±10℃, the actual temperature of the lubrication tank is 70±10℃, and the actual temperature of the drying is 110±10℃. S32: Lubrication. Start lubrication processing using a coated lubrication line. Lubrication tank concentration: refractometer measurement 6%-8%, lubrication tank conductivity 40-50mS. Use LUB632 lubricant and deionized water. When lubricating the polymer blank, if the liquid concentration is too high, add deionized water first; if the liquid concentration is too low, add lubricant first. After the liquid concentration is within a reasonable range, add water and lubricant at a ratio of 1:1. S33: Lubricating film weight: 0.03-0.055g, take 5 samples and measure the average value; S34: When the billet comes out of the drying area, it cannot be put directly into the material frame. A rust-proof bag needs to be placed in the material frame to ensure that the billet is clean and free of impurities. Lubricate and use it on the same day. Lubricant needs to be added if any of the following occurs: refractometer reading exceeds the tolerance, conductivity exceeds the tolerance, film weight exceeds the tolerance, or the lubrication tank liquid level cannot submerge the billet. S4 includes the following steps: S41: Install pre-extrusion molds and pre-extrude using a 650-ton cold forging machine; S42: First, extrude from the top of the billet. The billet groove is formed to 60%-70%. During the extrusion process, a part of the bottom will bulge out. S43: Cold forging machine speed control ratio 750 rpm; S44: Set the sealing height for the first test piece to 750.5, and then adjust it appropriately according to the size of the first piece; S5 includes the following steps: S51: Install pre-forging molds and pre-forge using a 650-ton cold forging machine; S52: Turn the blank over and squeeze both ends of the blank to shape the blank to 90%; S53: Cold forging machine speed control ratio 750 rpm; S54: The initial test sealing height is set to 748, and then adjusted appropriately according to the initial test dimensions; After the billet is cold-forged and its dimensions are appropriately adjusted, it is finally forged and inspected.

[0018] The working principle of this invention is as follows: In the blanking process, a circular saw is used to cut the material into φ37.2 cold-drawn bright round bars. The circular saw removes the head and tail of the bar, and the end face is deburred to ≤0.3mm. Large burrs need to be removed. The first piece must pass inspection before mass production can begin. In the shot blasting process, a drum shot blasting machine is used. The machine is loaded with 0.3mm diameter stainless steel shot. Shot blasting begins for 15 minutes at a current of 20±3A. The number of pieces blasted per batch is ≤500. After shot blasting, a rust-proof bag must be placed in the material frame. After shot blasting, the blank is ensured to be clean and free of impurities. The polymer lubrication process utilizes a coated lubrication line. The blank is then washed with water, with the actual temperatures of the heat exchanger (130±20℃), the hot water tank (90±10℃), the lubrication tank (70±10℃), and the drying temperature (110±10℃). Lubrication then begins using the coated lubrication line. The lubrication tank concentration is 6%-8% as measured by a refractometer, and the conductivity is 40-50 mS. LUB632 lubricant and deionized water are used. If the liquid concentration is too high during polymer lubrication of the blank, deionized water is added first. If the liquid concentration is too low, add lubricant first. Once the liquid concentration is within a reasonable range, add lubricant at a ratio of 1:1 (water:lubricant). The lubricating film weight should be 0.03-0.055g. Take 5 pieces and measure the average value. When the billet comes out of the drying area, it cannot be placed directly into the material frame. A rust-proof bag needs to be placed in the material frame to ensure that the billet is clean and free of impurities. Lubricate and use the billet on the same day. Lubricant needs to be added if any of the following occurs: refractometer reading exceeds tolerance, conductivity exceeds tolerance, film weight exceeds tolerance, or the lubricating tank liquid level cannot submerge the billet. For the pre-extrusion process, use a 650-ton cold forging machine. Install the pre-extrusion mold and use a 650-ton cold forging machine for pre-extrusion processing. First, extrude from the top of the billet until the groove is formed to 60%-70%. During the extrusion process, a portion will bulge out from the bottom. The speed control ratio of the cold forging machine is 750 rpm, and the first piece test sealing height is set to 750.5. Then, adjust appropriately according to the size of the first piece. For the pre-forging process, use a 650-ton cold forging machine. Install the pre-forging mold and use a 650-ton cold forging machine for pre-forging. Turn the billet over and extrude both ends of the billet to form 90%. The speed control ratio of the cold forging machine is 750 rpm, and the first piece test sealing height is set to 748. Then, adjust appropriately according to the size of the first piece. After the billet cold forging size is adjusted appropriately, final forging and final inspection are performed.

[0019] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. Cold forging process for magnetic core base, characterized in that, Includes the following steps: S1: Material cutting process, using a circular saw to cut the material; S2: Shot blasting process, using a drum shot blasting machine; S3: Polymer lubrication process, using coated lubrication lines for lubrication processing; S4: Pre-extrusion process, using a cold forging machine; including the following steps: S41: Install the pre-extrusion mold and pre-extrude using a 650-ton cold forging machine; S42: First extrude from the top of the billet, the billet groove is formed to 60%-70%, during the extrusion process, a part of the bottom will bulge out; S5: Pre-forging process, using a cold forging machine; includes the following steps: S51: Install the pre-forging die and pre-forge using a 650-ton cold forging machine; S52: Turn the billet over and squeeze both ends of the billet to shape it to 90%; S6: Annealing of the pre-forged billet to make the hardness of the pre-forged billet ≤120HB; S7: Shot blasting of pre-forged billets, the same as step S2; S8: Polymer lubricant, same as step S3; S9: Final forging.

2. The cold forging process for the magnetic core base according to claim 1, characterized in that, S1 includes the following steps: S11: Made of cold-drawn bright round bar stock; S12: Use a circular saw to remove the head and tail of the material; S13: Deburr the end face of the bright round bar stock; large burrs need to be removed.

3. The cold forging process for the magnetic core base according to claim 1, characterized in that, S2 includes the following steps: S21: Load material into the drum shot blasting machine. The stainless steel shot inside the drum shot blasting machine has a diameter of 0.3mm. S22: Use a drum shot blasting machine to start shot blasting, shot blasting time 15 minutes, current 20±3A; S23: The number of pieces shot blasted per cycle by a drum shot blasting machine is ≤500; S24: After shot blasting, there should be a rust-proof bag in the material frame to place the shot-blasted billet, ensuring that the appearance is clean and free of impurities.

4. The cold forging process for the magnetic core base according to claim 1, characterized in that, S3 includes the following steps: S31: Water washing, the billet is washed with water, wherein the actual temperature of the heat exchanger is 130±20℃, the actual temperature of the hot water tank is 90±10℃, the actual temperature of the lubrication tank is 70±10℃, and the actual temperature of the drying is 110±10℃. S32: Lubrication, lubrication process begins with a coated lubrication line, lubrication tank concentration: refractometer measurement 6%-8%, lubrication tank conductivity 40-50mS; S33: Lubricating film weight: 0.03-0.055g; S34: When the billet comes out of the drying area, it cannot be put directly into the material frame. A rust-proof bag needs to be placed in the material frame to ensure that the billet is clean and free of impurities. It should be lubricated and used on the same day.

5. The cold forging process for the magnetic core base according to claim 4, characterized in that, Deionized water is used.

6. The cold forging process for the magnetic core base according to claim 4, characterized in that, Lubricant needs to be added if any of the following occurs: refractometer reading is out of tolerance, conductivity is out of tolerance, film weight is out of tolerance, or the lubricant level in the tank cannot submerge the blank.

7. The cold forging process for the magnetic core base according to claim 4, characterized in that, When lubricating polymer blanks, if the liquid concentration is too high, add deionized water first; if the liquid concentration is too low, add lubricant first. Once the liquid concentration is within a reasonable range, add water and lubricant in a 1:1 ratio.

Images