Ejection device for precision die forging
By designing a precision die forging ejection device including lower die, transition plate and top rod, the problem of ejection rod indentation during forging die release is solved, and the surface quality and dimensional accuracy of forging is improved.
Patent Information
- Application Number
- CN202421588624.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-05
AI Technical Summary
During the forging mold discharge process, the top rod easily forms protruding or depression indentation on the surface of the forging, resulting in poor quality of the forging surface and affecting dimensional accuracy.
An ejection device for precision die forging is designed, including a lower die, a transition plate and at least two ejector rods. The ejector rod and the transition plate are threaded, and the upper end of the ejector rod is pressed against the bristle edge of the mold to achieve stable ejection of the forging.
It effectively avoids indentation on the forging surface during the pinning rod working, improves the dimensional accuracy and surface quality of the forging, reduces the amount of polishing, and improves production efficiency and product quality stability.
Smart Images
Figure CN222985631U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of forging, in particular to an ejection device for precision die forgings. Background Art
[0002] A forging for a certain type of aircraft landing gear has a forging structure of a long shaft type, which consists of a rod part and a head part. The rod part is a conventional stepped shaft with two protrusions on the side. The head part consists of a boss, a special-shaped groove, a rib plate and a shaft. All the non-machined surfaces are on the head part of the forging, and some local areas of the rod part are also non-machined surfaces. The forging has high dimensional accuracy requirements and a small draft angle. Similarly, high requirements are also placed on tolerances such as warping and misalignment that affect dimensional accuracy. It is usually produced by free forging to make a blank and then die forging on a hydraulic press with high equipment accuracy. Due to the small draft angle of the forging, the problem of sticking to the die is likely to occur, and the ejection function of the hydraulic press is used to solve the problem of difficult ejection of the forging.
[0003] During the working process of the ejection device, obvious ejector pin indentations will appear on the surface of the forging, which need to be removed by grinding later. During the grinding process, in order to ensure the shape and size of the forging, high technical level requirements are imposed on the operators, and often due to excessive grinding, the products become defective, seriously affecting the delivery of the forgings. Summary of the Utility Model
[0004] The purpose of the utility model is: by changing the traditional ejection structure of the forging die, including an ejector pin and a transition plate, the lower end of the ejector pin is connected to the transition plate by a thread, and the upper end of the ejector pin is arranged at the flash bridge part of the die, mainly to solve the problem that when the ejector pin is located in the die cavity, convex or concave ejector pin indentations are formed on the surface of the forging during the working period of the ejector pin. The surface quality of the forging is good, and it also helps to improve the dimensional accuracy of the forging.
[0005] To solve this technical problem, the technical solution of the utility model is:
[0006] The utility model provides an ejection device for precision die forgings, including: a lower die, a transition plate, and at least two ejector pins;
[0007] A cavity is arranged downward on the upper surface of the lower die, and a flash cavity is arranged in a circle along the outer edge of the cavity; an ejection cavity is opened upward on the lower surface of the lower die, the transition plate is located inside the ejection cavity, and the transition plate is placed on the equipment ejector pin; at least two ejector pin holes that are centrosymmetric are extended downward from the flash cavity; the ejector pin holes are communicated with the ejection cavity, and the ejector pins are accommodated in the ejector pin holes; the bottom end of the ejector pin is connected to the transition plate, and the top end abuts against the forging flash in the flash cavity; the central axes of the cavity and the ejection cavity are coaxial.
[0008] Furthermore, if the diameter of the equipment ejector pin is larger than the width of the ejection cavity, the ejection cavity is reamed in the area where the equipment ejector pin passes to match the equipment ejector pin.
[0009] Furthermore, the arc surface groove obtained by reaming is in clearance fit with the equipment ejector rod, and its diameter is 1-3 mm larger than that of the equipment ejector rod.
[0010] Furthermore, the ejection cavity is a long-strip area groove.
[0011] Furthermore, there is a clearance fit between the long-strip area groove and the transition plate, and the unilateral clearance L1 is 0.5-2 mm.
[0012] Furthermore, both the left ejector rod and the right ejector rod are cylindrical.
[0013] Furthermore, the ratio of the thickness to the width of the transition plate is 0.8-1.2.
[0014] The beneficial effects are as follows: By using the ejector rod of the present invention, the problem of the forging being ejected from the mold is solved. At the same time, during the operation of the ejector rod, the problem of the ejector rod indentation protruding or denting on the surface of the forging is avoided. The dimensional accuracy of the forging and the surface quality of the forging are improved, the grinding amount of the forging is reduced, the production cycle of the forging is increased, the production cost is saved, and the quality stability of the product is ensured. Description of the Drawings
[0015] Figure 1 It is a schematic diagram of a mold with an ejection structure;
[0016] Figure 2 It is a schematic cross-sectional view of the mold with the ejection structure;
[0017] Figure 3 It is a bottom view of the mold with the ejection structure. Specific Embodiments
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0019] The present utility model provides an ejection device for a forging mold, as Figures 1-3 shown, including: lower mold 1, transition plate 21, left ejector rod 31, right ejector rod 32; both the left ejector rod 31 and the right ejector rod 32 are located in the flash bridge area of the lower mold 1 of the forging mold.
[0020] Among them, the bottom surface of the lower die has grooves, which are divided into two parts, the long-strip area groove 11 and the arc-surface groove 12. The depth of the groove is H, where the width of the long-strip area groove 11 is W, and the diameter of the groove 12 is D. There is a clearance fit between the groove 11 and the transition plate 21, and the unilateral clearance L1 is 0.5 - 2 mm; there is a clearance fit between the groove 12 and the equipment ejector rod, and the diameter of the groove 12 is 1 - 3 mm larger than the diameter of the equipment ejector rod.
[0021] The lower ends of the left ejector rod 31 and the right ejector rod 32 are threadedly connected to the transition plate 21.
[0022] When the equipment ejector rod works in the vertical direction, the equipment ejector rod drives the transition plate 21 to move upward, and the transition plate 21 drives the left ejector rod 31 and the right ejector rod 32 to move upward along the ejector rod holes, so that the forging is separated from the cavity of the die 1. When the equipment ejector rod resets downward in the vertical direction, the transition plate 21 drives the left ejector rod 31 and the right ejector rod 32 to move downward under the action of gravity.
[0023] Furthermore, both the left ejector rod 31 and the right ejector rod 32 are cylindrical.
[0024] Furthermore, the upper end surfaces of the left ejector rod 31 and the right ejector rod 32 are machined to match the flash of the lower die 1.
[0025] Furthermore, the ratio of the thickness to the width of the transition plate 21 is 0.8 - 1.2.
[0026] Furthermore, the length dimension of the transition plate 21 depends on the width dimension of the forging cavity.
[0027] Furthermore, the materials used for the left ejector rod 31, the right ejector rod 32 and the transition plate 21 are the same as those of the lower die 1.
[0028] The present utility model provides an ejection device, as Figures 1-3 shown, comprising: the ejector rod includes: the lower die 1, the transition plate 21, the left ejector rod 31, the right ejector rod 32; both the left ejector rod 31 and the right ejector rod 32 are located in the flash bridge area of the lower die 1 of the forging die.
[0029] Among them, the bottom surface of the lower die has grooves, which are divided into two parts, the long-strip area groove 11 and the arc-surface groove 12. The depth of the groove is 105 mm, where the width of the long-strip area groove 11 is 32 mm, and the diameter of the groove 12 is 45 mm. There are two ejector rod holes arranged at the position of the flash bridge on the outer side of the cavity in the lower die 1, and the diameter of the ejector rod holes is 30 mm; the length of the transition plate 21 is 150 mm, the width is 30 mm, and the thickness is 30 mm; the diameters of the left ejector rod 31 and the right ejector rod 32 are 28 mm, and the length of the ejector rod is 270 mm.
[0030] After die forging is completed, the equipment ejects upward, lifting the transition plate 21 in the lower die 1, driving the left ejector rod 31 and the right ejector rod 32, and separating the forging from the lower die cavity through the left ejector rod 31 and the right ejector rod 32 to achieve the ejection function.
[0031] Using the above ejection device, the forgings that have completed die forging and heat treatment are inspected, and there are no ejector rod indentations on the surface of the forgings, and the dimensional accuracy of the forgings is higher.
Claims
1. A precision die forging ejector device, characterized in that: include: Lower die, transition plate, at least two ejector rods; A cavity is arranged downward on the upper surface of the lower die, and a circle of burr cavity is arranged on the outer edge of the cavity; An ejection cavity is opened upward on the lower surface of the lower die, a transition plate is located inside the ejection cavity, and the transition plate is placed on the ejector rod of the equipment; at least two ejector rod holes with central symmetry extend downward from the burr cavity; the ejector rod hole is connected with the ejection cavity, and the ejector rod is accommodated in the ejector rod hole; the bottom end of the ejector rod is connected with the transition plate, and the top end supports the burr of the forging in the burr cavity; the cavity is coaxial with the central axis of the ejection cavity.
2. The ejection device according to claim 1, characterized in that: If the diameter of the device ejector pin is larger than the width of the ejection cavity, the ejection cavity is enlarged in the area where the device ejector pin passes to match the device ejector pin.
3. The ejection device according to claim 2, characterized in that: The arc surface groove (12) obtained by expanding the hole is matched with the clearance of the equipment top rod, and the diameter is 1 to 3 mm larger than the diameter of the equipment top rod.
4. The ejection device according to claim 1, characterized in that: The ejection cavity is a long strip-shaped regional groove (11).
5. The ejection device according to claim 4, characterized in that: The long strip-shaped groove (11) and the transition plate (21) are clearance-matched, and the single-side clearance L1 is 0.5 to 2 mm.
6. The ejection device according to claim 1, characterized in that: The left push rod (31) and the right push rod (32) are both cylindrical.
7. The ejection device according to claim 1, characterized in that: The ratio of the thickness to the width of the transition plate (21) is 0.8 to 1.2.