A material returning structure for slope-free forging of a cylinder segment forging

Abstract

The present application is suitable for the technical field of hot working of metal materials, and relates to a metal material reverse extrusion forging material withdrawing mechanism design, in particular to a cylinder segment forging non-inclination forging material withdrawing structure, which does not need to reserve feeding and material taking spaces, can reduce the design height of a punch under the same conditions, can reduce the occupied equipment stroke, and can increase the upper limit of the forgable product height, and comprises a female die, a pressing plate is fixed at the top of the female die, a hole is formed in the middle of the pressing plate, and a through groove is formed on the left and right sides of the pressing plate, a slidable material withdrawing plate is arranged in the through groove, small holes and large holes are formed in the material withdrawing plate in communication, the inner diameter of the small holes is not less than the outer diameter of the punch and is less than the outer diameter of the forging, and the inner diameter of the large holes is not less than the outer diameter of the forging; meanwhile, the present application also provides a corresponding use method.

Description

Technical Field

[0001] This invention relates to the field of hot working technology of metal materials, and specifically to the design of a material ejection mechanism for reverse extrusion forging of metal materials, and a material ejection structure and forging method for non-sloping forging of cylindrical forgings. Background Technology

[0002] In order to facilitate the removal of the forging from the mold cavity, a draft angle is required for ordinary die forging. This draft angle will increase the cost of raw materials and machining. For cylindrical or other straight-walled forgings, reverse extrusion forging without draft angle can be used. In this type of forging, an ejector pin is required to separate the forging from the die, and an ejection mechanism is required to separate the forging from the punch.

[0003] Traditional ejection mechanisms are fixed and require a certain height space below the ejection plate for feeding and unloading. Figure 1 As shown, this space occupies the equipment travel and increases the punch length. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a non-sloping forging structure for cylindrical forgings, which eliminates the need for pre-reserved feeding and unloading space. Under the same conditions, it can reduce the design height of the punch, while also reducing the occupied equipment stroke and increasing the upper limit of the forgeable product height. This invention also provides a corresponding method of use.

[0005] The technical solution is as follows: a material removal structure for non-slant forging of cylindrical forgings, comprising a female die, characterized in that a pressure plate is fixed at the top of the female die, the pressure plate has a hole in the middle and through grooves on the left and right sides, a slidable material removal plate is provided in the through grooves, and the material removal plate has interconnected small holes and large holes, the inner diameter of the small holes is not less than the outer diameter of the punch and less than the outer diameter of the forging, and the inner diameter of the large holes is not less than the outer diameter of the forging.

[0006] A further feature is that limit heads are respectively installed at the left and right ends of the ejector plate; The pressure plate and the female mold are connected by bolts.

[0007] A forging method for a stripping structure using a cylindrical section forging without a draft angle, characterized by comprising the following steps; (1) The pressure plate is installed on the top of the female mold, and the ejector plate can slide inside the pressure plate; (2) Move the ejector plate so that the large hole on the ejector plate is aligned with the material cavity of the female mold, and the forging blank is inserted into the female mold through the large hole; (3) Move the ejector plate so that the small hole on the ejector plate is aligned with the material cavity of the female die, and the punch passes through the small hole to forge the forging blank; (4) The punch exits the female die, and the formed forging is blocked by the ejector plate and remains in the female die; (5) Move the ejector plate so that the large hole on the ejector plate is aligned with the material cavity of the female mold. Use the ejector rod at the bottom of the female mold to eject the forging. The forging passes through the large hole and exits.

[0008] With this invention, the switching between feeding, unloading and discharging is achieved by sliding the ejector plate, eliminating the need to reserve space for feeding and unloading. Under the same conditions, the punch design height can be reduced, the punch height-to-diameter ratio can be lowered to prevent instability, and the equipment stroke can be reduced, increasing the upper limit of forgeable product height. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the existing technology structure; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the ejector plate structure; Figure 4 The large hole on the ejector plate is aligned with the cavity of the female mold (i.e., the feeding and discharging state). Figure 5 The small hole on the ejector plate is aligned with the cavity of the female die (i.e., forging and ejection state). Detailed Implementation

[0010] See Figure 2 and Figure 3 As shown, a non-sloping forging ejection structure for cylindrical forgings includes a female die 2, with a pressure plate 4 fixed to the top of the female die 2 by bolts. Different pressure plates 4 can be replaced according to different punch models and sizes. The pressure plate 4 has a hole in the middle and through slots on the left and right sides. A sliding ejection plate 3 is provided in the through slot. The ejection plate 3 can slide horizontally in the through slot. The ejection plate 3 can also be replaced according to different punches. The ejection plate 3 has a small hole and a large hole that are connected. The inner diameter of the small hole is not less than the outer diameter of the punch 1 and less than the outer diameter of the forging, allowing the punch 1 to pass through but not the forging. The inner diameter of the large hole is not less than the outer diameter of the forging, allowing the forging to pass through smoothly.

[0011] Limiting heads 5 are installed at the left and right ends of the ejector plate 3, which can prevent the ejector plate 3 from falling out of the through groove 3 and also allow the small hole and large hole on the ejector plate 3 to be precisely aligned with the material cavity of the female mold 2. That is, when the limiting head 5 at one end abuts against the pressure plate 4, the small hole is exactly aligned with the material cavity of the female mold 2, and when the limiting head 5 at the other end abuts against the pressure plate 4, the large hole is exactly aligned with the material cavity of the female mold 2.

[0012] See Figure 4 and Figure 5 As shown, a forging method for a stripping structure using a cylindrical section forging without a slope includes the following steps; (1) The pressure plate 4 is installed on the top of the female mold 2, and the ejector plate 3 can slide inside the pressure plate 4; (2) Move the ejector plate 3 so that the large hole on the ejector plate 3 is aligned with the material cavity of the female mold 2, such as Figure 4 As shown, the forging blank is inserted into the female mold through the large hole; (3) Move the ejector plate 3 so that the small hole on the ejector plate aligns with the material cavity of the female die, and the punch 1 passes through the small hole to forge the forging blank, such as Figure 5 As shown; (4) The punch exits the female die, and the formed forging is blocked by the ejector plate and remains in the female die; (5) Move the ejector plate 3 so that the large hole on the ejector plate 3 is aligned with the material cavity of the female mold 2, such as Figure 4 As shown, the forging is ejected by the ejector pin at the bottom of the female mold 2, and the forging passes through the large hole to exit.

Claims

1. A stripping structure for non-skew forging of cylindrical forgings, comprising a female die, characterized in that, A pressure plate is fixed to the top of the female mold. The pressure plate has a hole in the middle and through slots on the left and right sides. A slidable ejector plate is provided in the through slots. The ejector plate has a small hole and a large hole that are connected to each other. The inner diameter of the small hole is not less than the outer diameter of the punch and not less than the outer diameter of the forging. The inner diameter of the large hole is not less than the outer diameter of the forging. Limiting heads are installed at the left and right ends of the ejector plate. The limiting heads can prevent the ejector plate from falling out of the through slots and can also make the small hole and the large hole on the ejector plate accurately aligned with the material cavity of the female mold.

2. The stripping structure for non-skew forging of cylindrical forgings according to claim 1, characterized in that, The pressure plate and the female mold are connected by bolts.

3. A forging method for a stripping structure using the cylindrical section forging of claim 1 without a draft angle, characterized in that, It includes the following steps; (1) The pressure plate is installed on the top of the female mold, and the ejector plate can slide inside the pressure plate; (2) Move the ejector plate so that the large hole on the ejector plate is aligned with the material cavity of the female mold, and the forging blank is inserted into the female mold through the large hole; (3) Move the ejector plate so that the small hole on the ejector plate is aligned with the material cavity of the female die, and the punch passes through the small hole to forge the forging blank; (4) The punch exits the female die, and the formed forging is blocked by the ejector plate and remains in the female die; (5) Move the ejector plate so that the large hole on the ejector plate is aligned with the material cavity of the female mold. Use the ejector rod at the bottom of the female mold to eject the forging. The forging passes through the large hole and exits.

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