A fuse middle fitting section material forging process

Abstract

The present application relates to a kind of fuse middle fitting section material forging process, first, take a short thick raw material, first pass through the mode of forming an elongated material that can be shaped into two middle fittings, then the elongated material is flattened, bending, so that the elongated material is shaped into the semi-finished product of fitting connecting cylinder, fitting flat body and fitting outer cylinder, then it is forged into shape, so as to form two connected middle fittings, finally cut off, so as to form the required two middle fittings.The present application has the advantages that: through the cooperation of rolling, flattening, bending, forging, cutting and other processes, one metal raw material can process two fuse middle fittings finished products, improve the utilization rate of raw materials, reduce material waste, and relatively also save materials.

Description

Technical Field

[0001] The invention relates to the field of fuse hardware processing, in particular to a material-saving forging process for a fuse middle hardware. Background Art

[0002] A fuse is an electrical device that generates heat to melt its fuse element, disconnecting the circuit when the current exceeds a specified value. A fuse is a current protector that uses the principle that, after the current exceeds a specified value for a period of time, the heat generated by the fuse element melts, thereby disconnecting the circuit. Fuses are widely used in high and low voltage power distribution and control systems, as well as in electrical equipment. As a short-circuit and overcurrent protector, they are one of the most commonly used protective devices.

[0003] When installing the fuse, the middle position of the fuse is usually matched with the middle hardware, such as Figure 1 As shown, the middle hardware of the fuse includes a hardware outer cylinder 1, a hardware connecting cylinder 2, and a hardware flat body 3 connected in sequence, wherein the center line of the hardware outer cylinder 1 and the center line of the hardware connecting cylinder 2 are perpendicular to each other, and the hardware flat body 3 is arranged at an angle, and the inclination direction of the hardware flat body 3 is from the side where the hardware flat body 3 is connected to the hardware connecting cylinder 2 and gradually inclines away from the center line of the hardware connecting cylinder 2.

[0004] The traditional method for processing the fuse's central fitting is casting. This method is relatively simple to process, and the resulting shape is very similar to the fuse's central fitting, requiring minimal subsequent processing. However, this method is prone to defects such as internal porosity and coarse structure, resulting in poor mechanical properties. Therefore, to address these defects, a forging method has been proposed to improve its mechanical properties.

[0005] However, the existing forging method is to take a relatively coarse raw material and forge it multiple times to form the outer cylindrical body 1 of the hardware, the hardware connecting cylindrical body 2, and the hardware flat body 3. At this time, the center line of the hardware flat body 3 is consistent with the center line of the hardware connecting cylindrical body 2. Finally, the hardware flat body 3 is bent to form the required fuse middle hardware. The above-mentioned forging method requires a cylindrical raw material with a diameter greater than the height of the outer cylinder of the hardware and a length consistent with the total length of the hardware in the middle of the fuse for forging, and only one workpiece is forged from one raw material, while the diameter of the hardware connecting cylinder 2 and the width of the hardware flat body 3 are both much smaller than the height of the outer cylinder of the hardware, which leads to material waste; in addition, the above-mentioned method requires the raw material to be forged multiple times to form the hardware connecting cylinder 2 and the hardware flat body 3, which is prone to breakage, especially for the hardware flat body 3, whose size is much smaller than the size of the distance, and correspondingly, the number of forgings is the largest, and correspondingly, it is more likely to break, resulting in product scrapping and increased production costs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a material-saving forging process for the middle hardware of a fuse which can save raw materials and reduce the generation of scrapped products.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a material-saving forging process for the middle hardware of a fuse, the middle hardware of the fuse includes a hardware outer cylinder, a hardware connecting cylinder, and a hardware flat body connected in sequence, wherein the center line of the hardware outer cylinder is perpendicular to the center line of the hardware connecting cylinder, the hardware flat body is inclined, and the inclination direction of the hardware flat body is from the side where the hardware flat body is connected to the hardware connecting cylinder and it gradually inclines away from the center line of the hardware connecting cylinder. It is characterized in that: the forging process includes the following steps: first, taking a short and thick raw material, first forming a slender material that can be formed into two middle hardware by rolling, and then flattening and bending the slender material to form the slender material into a semi-finished product of the hardware connecting cylinder, the hardware flat body and the hardware outer cylinder, and then forging and forming to form two connected middle hardware, and finally cutting to form the required two middle hardware.

[0008] Furthermore, in the middle hardware, the height of the hardware outer cylinder is h1, the diameter of the hardware outer cylinder is R1, the height of the hardware connecting cylinder is h2, the diameter of the hardware connecting cylinder is R2, the total length of the hardware flat body and the hardware connecting cylinder after the hardware flat body is flattened is L1, the thickness of the hardware flat body is D, and the length of the hardware flat body is L2. The forging process is specifically as follows:

[0009] S1 Billet rolling: First, a short, thick, cylindrical metal raw material is taken and sent to a billet rolling mill for processing, thereby pressing the metal raw material into a slender material. The slender material consists of a central cylindrical section located in the middle and side cylindrical sections located on both sides. The height of the central cylindrical section is greater than 2L1, the diameter of the central cylindrical section is greater than or equal to R2, the height of the side cylindrical sections is less than or equal to R1, the diameter of the side cylindrical sections is greater than R1, and the diameter of the side cylindrical sections is less than h1;

[0010] S2 Flattening and Bending: The slender material is then fed into a dedicated first mold to flatten and bend the middle cylindrical section of the slender material to form a semi-finished product. The semi-finished product includes a first section located in the middle, two second sections connected to both sides of the first section, and a side cylindrical section connected to the outside of the two second sections. The first section is flat, and its length is greater than 2L1. Its thickness is D. The first section is two flat metal fittings connected together. The second section is cylindrical, and its diameter is R2. Its height is h2. That is, the second section is the required metal fitting connection cylinder. At this time, the center line of the side cylindrical section is aligned with the center line of the second section.

[0011] S3 Forging: The semi-finished product is then fed into a dedicated second die, the opposite cylindrical segment is forged and formed, and the first segment is pre-cut to form a preliminary finished product. The preliminary finished product includes a first segment located in the middle, two second segments connected to both sides of the first segment, and a third segment connected to the outside of the two second segments. The middle portion of the first segment has two cutting grooves extending toward the center of the first segment, so that the first segment forms a structure consisting of two first segments and a connecting segment of the two first segments. The thickness of the first segment is D, and the length of the first segment is L2, that is, the first segment is the required flat body of the hardware. The third segment is cylindrical, with a diameter of R1 and a height of h1. At this time, the center line of the third segment is perpendicular to the center line of the second segment, that is, the third segment is the required outer cylindrical body of the hardware.

[0012] S4 Cutting: The primary finished product is fed into a dedicated third mold to cut the connecting section of the first section, so that the two first sections are separated, thereby forming the required two fuse middle hardware products.

[0013] Furthermore, in step S2, the dedicated first mold includes a first upper mold and a first lower mold distributed above and below;

[0014] A first positioning protrusion protruding downward is provided at the bottom end of the first upper mold, and the cross section of the first positioning protrusion is in the shape of an isosceles trapezoid. A first positioning groove cooperating with the first positioning protrusion is provided at the top end of the first lower mold, and the cross section of the first positioning groove is also in the shape of an isosceles trapezoid. When the first upper mold and the first lower mold are closed, the first positioning protrusion is embedded in the first positioning groove, thereby realizing the positioning and closing of the first upper mold and the first lower mold;

[0015] A first upper forging groove is provided at the bottom end of the first upper die, the first upper forging groove including a first groove provided on the lower bottom of the first positioning protrusion and second grooves located on both sides of the first groove and provided on the waist of the first positioning protrusion; a first lower forging groove is provided at the top end of the first lower die, the first lower forging groove including a third groove provided on the lower bottom of the first positioning groove and fourth grooves located on both sides of the third groove and provided on the waist of the first positioning groove; after the first upper die and the first lower die are closed, the first groove and the third groove cooperate to form a first section of the molding cavity, and the second groove and the fourth groove cooperate to form a second section of the molding cavity;

[0016] A third groove connected to the second groove is provided on both sides of the first upper die, and the third groove is used to avoid the side cylindrical section.

[0017] Furthermore, in step S3, the dedicated second mold includes a second upper mold and a second lower mold distributed above and below;

[0018] A second upper groove is provided at the bottom end of the second upper mold, and a second lower groove is provided at the top end of the second lower mold. The cross-sections of the second upper groove and the second lower groove are both isosceles trapezoidal, and the upper base of the second upper groove is longer than the lower base of the second upper groove, and the upper base of the second lower groove is shorter than the lower base of the second lower groove. After the second upper mold and the second lower mold are closed, the second upper groove and the second lower groove cooperate to form an avoidance cavity for molding;

[0019] The bottom end of the second upper die is provided with a second upper forging seat arranged at the upper bottom of the second upper groove, and a pair of symmetrically distributed second upper forging grooves are opened on the bottom end surface of the second upper forging seat, and the second upper forging grooves include a fifth groove, a sixth groove, and a seventh groove distributed in sequence, and a downwardly protruding preliminary cut upper rib is also provided on the bottom end surface of the second upper forging seat between the two second upper forging grooves, and the top end of the second lower die is provided with a second lower forging seat arranged at the lower bottom of the second lower groove, and a pair of symmetrically distributed second lower forging grooves are opened on the top end surface of the second lower forging seat The second lower forging groove includes an eighth groove, a ninth groove, and a tenth groove distributed in sequence. There is also an upwardly protruding preliminary cut lower rib plate on the top surface of the second lower forging seat between the two second lower forging grooves. After the second upper die and the second lower die are closed, the fifth groove and the eighth groove cooperate to form the molding cavity of the third section, the sixth groove and the ninth groove cooperate to form the molding cavity of the second section, and the seventh groove and the tenth groove cooperate to form the molding cavity of the first section. The preliminary cut upper rib plate and the preliminary cut lower rib plate cooperate to press out the cutting grooves on both sides of the first section.

[0020] Furthermore, in step S4, the dedicated third mold includes an upper cutting seat and a lower base disposed up and down;

[0021] An upper cutter is installed at the bottom end of the upper cutting seat, and a pair of parallel distributed limit seats are installed on the upper end surface of the lower base, with a gap for inserting the first segment left between the two limit seats, and a cutter groove for inserting the upper cutter is also provided on the limit seat;

[0022] There is a guide column on both sides of the upper cutter, so that the entire upper cutter is in an I-shape. At the same time, there is a guide groove connected to the cutter groove on the limit seat, so that the cutter groove on the limit seat is in a T-shape.

[0023] The advantages of the present invention are that: the forging process of the present invention can process two fuse middle hardware finished products from one metal raw material through the cooperation of rolling, flattening, bending, forging and cutting processes, thereby improving the utilization rate of raw materials, reducing material waste, and relatively saving materials.

[0024] In addition, the entire processing process only requires two forgings to form, which greatly reduces the number of forging times, and the amount of compression deformation during forging is also reduced accordingly, which reduces the phenomenon of cracks on the product surface, reduces the generation of scrapped products, and reduces costs.

[0025] The design of the dedicated first mold realizes the positioning of the closing position of the first upper mold and the first lower mold through the cooperation between the first positioning protrusion and the first positioning groove, thereby ensuring the accuracy of the closing; and the design of the third groove is because the entire processing process requires bending between the second section and the first section, which will cause mutual interference between the side cylindrical section and the first upper mold. Therefore, the third groove is used to avoid the side cylindrical section, thereby avoiding the occurrence of such mutual interference.

[0026] The design of the dedicated second die forms an avoidance cavity through the cooperation of the second upper groove and the second lower groove, providing a basis for the smooth forging; and the design of the initial cut upper rib plate and the initial cut lower rib plate is to be able to pre-press cutting grooves on both sides of the first section at the same time during the forging process, reducing the cutting amount of the subsequent upper cutter and providing a good basis for the smooth cutting.

[0027] The design of the dedicated third mold uses the cooperation of the upper cutter and the cutting groove to cut the first section, ensuring the stability of the upper cutter's movement process and avoiding deviation. The design of the guide column and guide groove guides the upper cutter and further stabilizes the upper cutter's movement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 It is a schematic diagram of the middle hardware of the fuse in the present invention.

[0030] Figure 2 Schematic diagram of the elongated material in the present invention.

[0031] Figure 3 Schematic diagram of the semi-finished product of the present invention.

[0032] Figure 4 This is a schematic diagram of the clamping state of the first mold used in the present invention.

[0033] Figure 5 This is a schematic diagram of the mold opening state of the first mold used in the present invention.

[0034] Figure 6 This is a schematic diagram of the molding state of the semi-finished product in the present invention.

[0035] Figure 7 Schematic diagram of the first upper mold in the present invention.

[0036] Figure 8 Schematic diagram of the first lower mold in the present invention.

[0037] Figure 9A closing view of the second mold special for the present invention.

[0038] Figure 10 A closing side view of the second mold special for the present invention.

[0039] Figure 11 A schematic view of the second upper mold in the present invention.

[0040] Figure 12 A schematic view of the second lower mold in the present invention.

[0041] Figure 13 A schematic view of the semi-finished product placed on the second lower mold in the present invention.

[0042] Figure 14 A schematic view of the third mold special for the present invention.

[0043] Figure 15 A schematic view of the cutting of the semi-finished product in the present invention.

[0044] Figure 16 A sectional view of the upper cutting knife in the present invention.

[0045] Figure 17 A schematic view of the semi-finished product placed on the third mold special in the present invention. DETAILED DESCRIPTION

[0046] The following examples can make the skilled in the art more fully understand the present invention, but not therefore limit the present invention in the scope of the described examples.

[0047] As Figure 1 shown in the fuse middle part hardware, it comprises hardware outer cylinder 1, hardware connecting cylinder 2 and hardware flat body 3 connected in sequence, wherein the center line of the hardware outer cylinder 1 is perpendicular to the center line of the hardware connecting cylinder 2, the hardware flat body 3 is arranged obliquely, and the oblique direction of the hardware flat body 3 is gradually inclined away from the center line of the hardware connecting cylinder 2 from the side of the hardware flat body 3 connected with the hardware connecting cylinder 2.

[0048] In the fuse middle part hardware, the height of the hardware outer cylinder 1 is h1, the diameter of the hardware outer cylinder 1 is R1, the height of the hardware connecting cylinder 2 is h2, the diameter of the hardware connecting cylinder 2 is R2, the total length of the hardware flat body 3 and the hardware connecting cylinder 2 after the hardware flat body 3 is laid flat is L1, the thickness of the hardware flat body 3 is D, and the length of the hardware flat body 3 is L2.

[0049] The material-saving forging process of the fuse middle part hardware of the present invention is realized through the following steps:

[0050] S1 Rolling: First, take a short and thick cylindrical metal raw material and send it to the rolling mill for processing, so that the metal raw material is pressed into a slender material, such as Figure 2 As shown, the slender material is composed of a middle cylindrical section 11 located in the middle and side cylindrical sections 12 located on both sides, wherein the height of the middle cylindrical section 11 is greater than 2L1, the diameter of the middle cylindrical section 11 is greater than or equal to R2, the height of the side cylindrical section 12 is less than or equal to R1, the diameter of the side cylindrical section 12 is greater than R1, and the diameter of the side cylindrical section 12 is less than h1.

[0051] S2 Flattening and bending: The slender material is then fed into a dedicated first mold to flatten and bend the middle cylindrical section 11 of the slender material, thereby forming a semi-finished product, such as Figure 3 As shown, the semi-finished product includes a first section 21 located in the middle, two second sections 22 connected to both sides of the first section 21, and a side cylindrical section 12 connected to the outside of the two second sections 22, wherein the first section 21 is flat, and the length of the first section 21 is greater than 2L1, the thickness of the first section 21 = D, the first section 21 is two connected together metal fitting flat bodies 3, the second section 22 is cylindrical, and the diameter of the second section 22 = R2, the height of the second section 22 = h2, that is, the second section 22 is the required metal fitting connecting cylinder 2, at this time, the center line of the side cylindrical section 12 and the center line of the second section 22 are the same straight line.

[0052] like Figure 4-Figure 8 As shown in the schematic diagram, the dedicated first mold includes a first upper mold 23 and a first lower mold 24 distributed up and down. The first upper mold 23 is driven by a corresponding hydraulic cylinder to move up and down, thereby realizing the opening and closing of the mold with the first lower mold 24.

[0053] At the bottom end of the first upper mold 23, there is a first positioning protrusion 25 protruding downward, and the cross-section of the first positioning protrusion 25 is an isosceles trapezoidal shape. At the top end of the first lower mold 24, there is a first positioning groove 26 that matches the first positioning protrusion 25, and the cross-section of the first positioning groove 26 is also an isosceles trapezoidal shape. When the first upper mold 23 and the first lower mold 24 are closed, the first positioning protrusion 25 is embedded in the first positioning groove 26, thereby realizing the positioning and closing of the first upper mold 23 and the first lower mold 24.

[0054] A first upper forging groove is provided at the bottom end of the first upper die 23, and the first upper forging groove includes a first groove 231 arranged on the lower bottom of the first positioning protrusion 25 and a second groove 232 located on both sides of the first groove 231 and arranged on the waist of the first positioning protrusion 25. A first lower forging groove is provided at the top end of the first lower die 24, and the first lower forging groove includes a third groove 241 arranged on the lower bottom of the first positioning groove 26 and a fourth groove 242 located on both sides of the third groove 241 and arranged on the waist of the first positioning groove 26. After the first upper die 23 and the first lower die 24 are closed, the first groove 231 and the third groove 241 cooperate to form the molding cavity of the first section 21, and the second groove 232 and the fourth groove 242 cooperate to form the molding cavity of the second section 22.

[0055] A third groove 233 connected to the second groove 232 is provided on both sides of the first upper mold 23 . The third groove 233 is used to avoid the side cylindrical section 12 .

[0056] The design of the dedicated first mold realizes the positioning of the first upper mold 23 and the first lower mold 24 through the cooperation between the first positioning protrusion 25 and the first positioning groove 26, thereby ensuring the accuracy of the mold closing; and the design of the third groove 233 is because the entire processing process requires bending between the second section 22 and the first section 21, which will cause mutual interference between the side cylindrical section 12 and the first upper mold 23. Therefore, the third groove 233 is used to avoid the side cylindrical section 12, thereby avoiding the occurrence of such mutual interference.

[0057] S3 Forging and forming: The semi-finished product is then sent into a dedicated second mold, the cylindrical segment on the opposite side is forged and formed, and the first segment is preliminarily cut to form a preliminary finished product, which includes a first segment 21 located in the middle, two second segments 22 connected on both sides of the first segment 21, and a third segment 27 connected to the outside of the two second segments 22, wherein the middle position of the first segment 21 has two cutting grooves extending toward the center direction of the first segment 21, so that the first segment forms a structure composed of two first segments 28 and the connecting segments of the two first segments 28, the thickness of the first segment 28 = D, the length of the first segment 28 = L2, that is, the first segment 28 is the required flat body of the hardware, the third segment 27 is cylindrical, the diameter of the third segment 27 = R1, the height of the third segment 27 = h1, at this time, the center line of the third segment 27 is perpendicular to the center line of the second segment 22, that is, the third segment 27 is the required outer cylinder of the hardware.

[0058] like Figures 9-13 As shown in the schematic diagram, the dedicated second mold includes a second upper mold 31 and a second lower mold 32 distributed up and down. The second upper mold 31 is driven by a corresponding hydraulic cylinder to move up and down, thereby realizing opening and closing of the mold with the second lower mold 32.

[0059] A second upper groove 33 is provided at the bottom end of the second upper mold 31, and a second lower groove 34 is provided at the top end of the second lower mold 32. The cross-sections of the second upper groove 33 and the second lower groove 34 are both isosceles trapezoidal, and the upper base of the second upper groove 33 is longer than the lower base of the second upper groove 33, and the upper base of the second lower groove 34 is shorter than the lower base of the second lower groove 34. After the second upper mold 31 and the second lower mold 32 are closed, the second upper groove 33 and the second lower groove 34 cooperate to form an avoidance cavity 35 for molding.

[0060] The bottom end of the second upper die 31 is provided with a second upper forging seat 311 arranged at the upper bottom of the second upper groove 33, and a pair of symmetrically distributed second upper forging grooves are opened on the bottom end surface of the second upper forging seat 311, and the second upper forging grooves include a fifth groove 312, a sixth groove 313, and a seventh groove 314 distributed in sequence. A downwardly protruding preliminary cut upper rib 315 is also provided on the bottom end surface of the second upper forging seat 311 between the two second upper forging grooves. The top end of the second lower die 32 is provided with a second lower forging seat 321 arranged at the lower bottom of the second lower groove 34, and a pair of symmetrically distributed second lower forging grooves are opened on the top end surface of the second lower forging seat 321. The second lower forging grooves include The eighth groove 322, the ninth groove 323, and the tenth groove 324 are distributed in sequence. There is also an upwardly protruding preliminary cut lower rib 325 on the top surface of the second lower forging seat 321 between the two second lower forging grooves. After the second upper mold 31 and the second lower mold 32 are closed, the fifth groove 312 and the eighth groove 322 cooperate together to form the molding cavity of the third section 27, the sixth groove 313 and the ninth groove 323 cooperate together to form the molding cavity of the second section 22, the seventh groove 314 and the tenth groove 324 cooperate together to form the molding cavity of the first segment 23, and the preliminary cut upper rib 315 and the preliminary cut lower rib 325 cooperate together to press out the cutting grooves on both sides of the first section 21.

[0061] The design of the dedicated second mold forms an avoidance cavity 35 through the cooperation of the second upper groove 33 and the second lower groove 34, providing a basis for the smooth progress of forging; and the design of the initial cut upper rib 315 and the initial cut lower rib 325 is to be able to pre-press cutting grooves on both sides of the first section 21 at the same time during the forging process. When the upper cutter 43 is used to cut the first section 21, it is cut along the width direction of the first section 21, and the width of the first section 21 is much larger than the thickness of the first section 21. Therefore, the cutting groove is used to reduce the subsequent cutting amount of the upper cutter 43, providing a good basis for the smooth progress of cutting.

[0062] S4 Cutting: The primary finished product is fed into a dedicated third mold, and the connecting section of the first section 21 is cut to separate the two first segments 28 , thereby forming the required two fuse middle hardware products.

[0063] like Figure 14-17 As shown in the schematic diagram, the dedicated third mold includes an upper cutting seat 41 and a lower base 42 distributed up and down. The upper cutting seat 41 is driven by a corresponding hydraulic cylinder to move up and down, thereby cooperating with the lower base 42 to cut the connecting section.

[0064] An upper cutter 43 is installed at the bottom end of the upper cutting seat 41, and a pair of parallel limit seats 44 are installed on the upper end surface of the lower base 42. A gap is left between the two limit seats 44 to accommodate the insertion of the first segment 28, and the limit seat 44 also has a cutting groove for accommodating the insertion of the upper cutter 43.

[0065] A guide post 45 is located on either side of the upper cutter 43, giving the entire upper cutter 43 an I-shape. The stopper 44 also features a guide slot connected to the cutter slot, giving the cutter slot on the stopper a T-shape. The dedicated third die design utilizes the upper cutter and the cutter slot to cut the first section, ensuring the stability of the upper cutter's movement and preventing deviation. The guide post and slot further guide the upper cutter, further stabilizing its movement.

[0066] The material-saving forging process for the fuse middle hardware of the present invention can process two finished fuse middle hardware products from one metal raw material through the cooperation of rolling, flattening, bending, forging and cutting processes, thereby improving the utilization rate of raw materials, reducing material waste, and saving materials accordingly; in addition, the entire processing process only requires two forgings to form, greatly reducing the number of forging times, and the amount of compression deformation during forging is also correspondingly reduced, thereby reducing the phenomenon of cracks on the product surface, reducing the generation of scrap products, and reducing costs.

[0067] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for forging a fuse middle fitting to save material, wherein the fuse middle fitting comprises a fitting outer cylinder, a fitting connecting cylinder, and a fitting flat body connected in sequence, wherein the centerline of the fitting outer cylinder and the centerline of the fitting connecting cylinder are perpendicular to each other, and the fitting flat body is inclined, and the inclination direction of the fitting flat body is from the side where the fitting flat body and the fitting connecting cylinder are connected to gradually incline away from the centerline of the fitting connecting cylinder, characterized in that: The forging process includes the following steps: First, a short, thick raw material is rolled into a slender material that can be formed into two middle hardware fittings. The slender material is then flattened and bent to form a semi-finished product of a hardware connecting cylinder, a hardware flat body, and a hardware outer cylinder. The material is then forged to form two connected middle hardware fittings. Finally, it is cut to form the required two middle hardware fittings. In the middle hardware, the height of the hardware outer cylinder is h1, the diameter of the hardware outer cylinder is R1, the height of the hardware connecting cylinder is h2, the diameter of the hardware connecting cylinder is R2, the total length of the hardware flat body and the hardware connecting cylinder after the hardware flat body is flattened is L1, the thickness of the hardware flat body is D, and the length of the hardware flat body is L2. The forging process is specifically as follows: S1 Billet rolling: First, a short, thick, cylindrical metal raw material is taken and sent to a billet rolling mill for processing, thereby pressing the metal raw material into a slender material. The slender material consists of a central cylindrical section located in the middle and side cylindrical sections located on both sides. The height of the central cylindrical section is greater than 2L1, the diameter of the central cylindrical section is greater than or equal to R2, the height of the side cylindrical sections is less than or equal to R1, the diameter of the side cylindrical sections is greater than R1, and the diameter of the side cylindrical sections is less than h1; S2 Flattening and Bending: The slender material is then fed into a dedicated first mold to flatten and bend the middle cylindrical section of the slender material to form a semi-finished product. The semi-finished product includes a first section located in the middle, two second sections connected to both sides of the first section, and a side cylindrical section connected to the outside of the two second sections. The first section is flat, and its length is greater than 2L1. Its thickness is D. The first section is two connected flat metal fittings. The second section is cylindrical, and its diameter is R2. Its height is h2. That is, the second section is the required metal fitting connection cylinder. At this time, the center line of the side cylindrical section is aligned with the center line of the second section. S3 Forging: The semi-finished product is then fed into a dedicated second die, the opposite cylindrical segment is forged and formed, and the first segment is pre-cut to form a preliminary finished product. The preliminary finished product includes a first segment located in the middle, two second segments connected to both sides of the first segment, and a third segment connected to the outside of the two second segments. The middle portion of the first segment has two cutting grooves extending toward the center of the first segment, so that the first segment forms a structure consisting of two first segments and a connecting segment of the two first segments. The thickness of the first segment is D, and the length of the first segment is L2, that is, the first segment is the required flat body of the hardware. The third segment is cylindrical, with a diameter of R1 and a height of h1. At this time, the center line of the third segment is perpendicular to the center line of the second segment, that is, the third segment is the required outer cylindrical body of the hardware. S4 Cutting: The primary finished product is fed into a dedicated third mold to cut the connecting section of the first section, so that the two first sections are separated, thereby forming the required two fuse middle hardware products.

2. The material-saving forging process for the fuse middle hardware according to claim 1, characterized in that: In step S2, the dedicated first mold includes a first upper mold and a first lower mold distributed above and below; A first positioning protrusion protruding downward is provided at the bottom end of the first upper mold, and the cross section of the first positioning protrusion is in the shape of an isosceles trapezoid. A first positioning groove cooperating with the first positioning protrusion is provided at the top end of the first lower mold, and the cross section of the first positioning groove is also in the shape of an isosceles trapezoid. When the first upper mold and the first lower mold are closed, the first positioning protrusion is embedded in the first positioning groove, thereby realizing the positioning and closing of the first upper mold and the first lower mold; A first upper forging groove is provided at the bottom end of the first upper die, the first upper forging groove including a first groove provided on the lower bottom of the first positioning protrusion and second grooves located on both sides of the first groove and provided on the waist of the first positioning protrusion; a first lower forging groove is provided at the top end of the first lower die, the first lower forging groove including a third groove provided on the lower bottom of the first positioning groove and fourth grooves located on both sides of the third groove and provided on the waist of the first positioning groove; after the first upper die and the first lower die are closed, the first groove and the third groove cooperate to form a first section of the molding cavity, and the second groove and the fourth groove cooperate to form a second section of the molding cavity; A third groove connected to the second groove is provided on both sides of the first upper die, and the third groove is used to avoid the side cylindrical section.

3. The material-saving forging process for fuse middle hardware according to claim 1, characterized in that: In step S3, the dedicated second mold includes a second upper mold and a second lower mold distributed above and below; A second upper groove is provided at the bottom end of the second upper mold, and a second lower groove is provided at the top end of the second lower mold. The cross-sections of the second upper groove and the second lower groove are both isosceles trapezoidal. After the second upper mold and the second lower mold are closed, the second upper groove and the second lower groove cooperate to form an avoidance cavity for molding; The bottom end of the second upper die is provided with a second upper forging seat arranged at the upper bottom of the second upper groove, and a pair of symmetrically distributed second upper forging grooves are opened on the bottom end surface of the second upper forging seat, and the second upper forging grooves include a fifth groove, a sixth groove, and a seventh groove distributed in sequence, and a downwardly protruding preliminary cut upper rib is also provided on the bottom end surface of the second upper forging seat between the two second upper forging grooves, and the top end of the second lower die is provided with a second lower forging seat arranged at the lower bottom of the second lower groove, and a pair of symmetrically distributed second lower forging grooves are opened on the top end surface of the second lower forging seat The second lower forging groove includes an eighth groove, a ninth groove, and a tenth groove distributed in sequence. There is also an upwardly protruding preliminary cut lower rib plate on the top surface of the second lower forging seat between the two second lower forging grooves. After the second upper die and the second lower die are closed, the fifth groove and the eighth groove cooperate to form the molding cavity of the third section, the sixth groove and the ninth groove cooperate to form the molding cavity of the second section, and the seventh groove and the tenth groove cooperate to form the molding cavity of the first section. The preliminary cut upper rib plate and the preliminary cut lower rib plate cooperate to press out the cutting grooves on both sides of the first section.

4. The material-saving forging process for fuse middle hardware according to claim 1, characterized in that: In step S4, the dedicated third mold includes an upper cutting seat and a lower base distributed above and below; An upper cutter is installed at the bottom end of the upper cutting seat, and a pair of parallel limit seats are installed on the upper end surface of the lower base, with a gap for inserting the first segment left between the two limit seats, and a cutter groove for inserting the upper cutter is also provided on the limit seat; There is a guide column on both sides of the upper cutter, so that the entire upper cutter is in an I-shape. At the same time, there is a guide groove connected to the cutter groove on the limit seat, so that the cutter groove on the limit seat is in a T-shape.

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