Sealed forging technology for hexagonal skirt trailer ball

Abstract

The invention discloses a hexagonal skirt trailer ball closed forging technology which comprises the following steps: S01, blanking: cutting a raw material into a plurality of blanks with the same length by using a cutting machine, S02, cogging: putting the blanks into cross wedge rolling equipment, rotating two rollers with wedge-shaped dies in the same direction, driving the blanks to rotate, rolling into a stepped shaft, controlling the rolling temperature to be 1150 + / -50 DEG C and the rolling time to be 2-3 hours, and rolling the stepped shaft into a blank; the stepped shaft is horizontally placed in a lower die body of a forming die, an upper die body moves downwards to be vertically locked with the lower die body, the left die body and the right die body extrude towards the center at the same time, closed forging of the trailer ball blank is completed, and the forming temperature is 1050 + / -50 DEG C. The process has the advantages that the process is reasonable in design and high in practicability, and the hexagonal skirt trailer ball forged through the process effectively solves the problems that a traditional open type forging process for the hexagonal skirt trailer ball is multiple in procedure, much in waste, low in yield, short in die service life, poor in dimensional stability and high in machining cost.

Description

Technical Field

[0001] The invention relates to the technical field of forging, in particular to a closed forging technology for a hexagonal skirt trailer ball. Background Art

[0002] The trailer ball is a trailer component commonly used in daily life. At present, the domestic hexagonal skirt trailer ball forging generally adopts the traditional open forging process, which requires five steps: blanking, partial drawing, partial upsetting, forging and trimming. Since the product has a hexagonal skirt, the complete forging technology of the skirt is difficult. Therefore, the open forging process not only has many processes, but also a lot of forming waste edges. At the same time, the material fluidity is large during the forging process, the mold wear is aggravated, and the dimensional stability of the forging is poor. Ultimately, this traditional open forging process has the disadvantages of much waste, low yield, short mold life, poor dimensional stability of forgings, and high cost. Summary of the invention

[0003] In response to the above problems, the present invention provides a closed forging technology for a hexagonal skirt trailer ball, which solves the problems of the traditional open forging process of the hexagonal skirt trailer ball, such as multiple steps, large amount of waste, low yield, short mold life, poor dimensional stability and high processing cost.

[0004] The present invention adopts the following technical solution: A closed forging technology for a hexagonal skirt trailer ball comprises the following steps: S01. Cutting: Use a cutting machine to cut the raw material into several blanks of equal length; S02. Opening the blank: placing the blank into a wedge cross rolling device, the two rolls with wedge-shaped dies rotate in the same direction, driving the blank to rotate, and rolling it into a stepped shaft, the rolling temperature is 1150±50°C; S03. Forming: Place the stepped shaft horizontally in the lower die of the forming die, move the upper die downward and lock it vertically with the lower die, and extrude the left and right dies toward the center at the same time to complete the closed forging of the trailer ball blank. The forming temperature is 1050±50℃.

[0005] Furthermore, before cutting in S01, the raw materials are selected. According to the requirements of this product, round bars made of 45# steel are selected. 45# steel has the advantages of good cold and hot processing performance, good mechanical properties, low price and wide source.

[0006] Furthermore, before the S02 blanking, a medium frequency induction furnace is used to heat the blank, and the heating temperature is 1190±10°C.

[0007] Furthermore, the forming die in S03 is matched with a customized three-way hydraulic press, the lower die of the forming die is fixed, and the upper die, the left die and the right die cooperate with the three-way hydraulic press to perform die forging.

[0008] The advantages of the present invention are: compared with the prior art, the process method of the present invention is reasonably designed and highly practical, and has the following advantages: 1. Reduce forging processes to improve production efficiency, reducing the original four forging processes to two processes, reducing labor costs and equipment investment costs; 2. Reduce the waste ratio and reduce the loss of raw materials. Since the original forging process has a large amount of waste edges, the closed forging method of the present invention has almost no waste edges, thereby reducing the proportion of waste to finished products from 30% to 3%, while reducing the energy consumption of material heating; 3. Improve the yield rate. The original forging process is very likely to cause insufficient filling and lead to product scrapping, but the fully enclosed forging of the present invention does not have this problem; 4. Improve the life of the die. The original forging process adopts open forging, the material flow form is complex and changeable, the die wear is serious, and the die maintenance cycle is 2800 times / piece on average. The die used in the present invention adopts a half structure and fully enclosed forging. The material flow form belongs to upsetting, the die wear is very small, and the die maintenance cycle is 20000 times / piece on average; 5. The dimensional consistency of forgings is greatly improved. Since the mold used in the present invention has little wear, the dimensional stability of forgings is greatly improved compared with the original process, and the surface quality of forgings is also greatly improved, providing more convenience for subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic cross-sectional view of a roller of the present invention; Figure 2 It is a structural diagram of the molding die of the present invention; Figure 3 It is a schematic diagram of the forging of the forming die of the present invention.

[0010] In the figure, 1-blank, 2-roller, 3-step shaft, 4-lower die, 5-upper die, 6-left die, 7-right die, 8-trailer ball blank. DETAILED DESCRIPTION

[0011] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0012] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0013] See also Figure 1-Figure 3 As shown, a closed forging technology for a hexagonal skirt trailer ball includes the following steps: S01. Cutting: using a cutting machine to cut the raw material into a number of blanks 1 of equal length; S02. Opening the blank: placing the blank 1 into the wedge cross rolling equipment, two rolls 2 with wedge-shaped dies rotate in the same direction, driving the blank 1 to rotate, and rolling into a stepped shaft 3, the rolling temperature is 1150±50℃; S03. Forming: Place the stepped shaft 3 horizontally in the lower die 4 of the forming die, move the upper die 5 downward and vertically lock it with the lower die 4, and extrude the left die 6 and the right die 7 toward the center at the same time to complete the closed forging of the trailer ball blank 8. The forming temperature is 1050±50℃.

[0014] Among them, the raw materials will be selected before cutting in S01. According to the needs of this product, round bars made of 45 steel are selected. 45 steel has the advantages of good cold and hot processing performance, good mechanical properties, low price and wide source; before blanking in S02, a medium frequency induction furnace is used to heat the blank 1, and the heating temperature is 1190±10℃; the forming mold in S03 is equipped with a customized three-way hydraulic press, the lower mold 4 of the forming mold is fixed, and the upper mold 5, the left mold 6 and the right mold 7 cooperate with the three-way hydraulic press for closed-die forging.

[0015] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0016] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A closed forging technology for a hexagonal skirt trailer ball, characterized in that: The following steps are involved: S01. Cutting: Use a cutting machine to cut the raw material into several blanks of equal length; S02. Opening the blank: placing the blank into a wedge cross rolling device, two rolls with wedge-shaped dies rotate in the same direction, driving the blank to rotate, and rolling into a stepped shaft, the rolling temperature is 1150±50°C; S03. Forming: Place the stepped shaft horizontally in the lower die of the forming die, move the upper die downward and lock it vertically with the lower die, and extrude the left and right dies toward the center at the same time to complete the closed forging of the trailer ball blank. The forming temperature is 1050±50℃.

2. A hexagonal skirt trailer ball closed forging technology according to claim 1, characterized in that: Before cutting S01, the raw materials will be selected. According to the needs of this product, round bars made of 45 steel are selected. 45 steel has the advantages of good cold and hot processing performance, good mechanical properties, low price and wide source.

3. The closed forging technology of a hexagonal skirt trailer ball according to claim 1 is characterized in that: Before the S02 blanking, a medium frequency induction furnace is used to heat the blank at a heating temperature of 1190±10°C.

4. The closed forging technology of a hexagonal skirt trailer ball according to claim 1 is characterized in that: The forming die in S03 is matched with a customized three-way hydraulic press, the lower die of the forming die is fixed, and the upper die, the left die and the right die cooperate with the three-way hydraulic press to perform die forging.

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