An inner convex platform ring forming device

Abstract

The present invention relates to the field of internally convex ring parts, and discloses a forming device for internally convex ring parts, which includes an upper die and a lower die. The upper die can be pressed down twice. The lower side of the upper die is a flat pressing surface. When the upper die is pressed down for the first time, the flat pressing surface faces downward. A forming protrusion is provided on the upper side of the upper die. When the upper die is pressed down for the second time, the upper die is flipped so that the forming protrusion faces downward. A forming groove is provided on the lower die. The flat pressing surface can cover the forming groove, and the forming protrusion can be accommodated in the forming groove. The present invention enables the product to be formed quickly, maintains the continuity of the product streamline, improves the product quality, and reduces the allowance during processing.

Description

Technical Field

[0001] The present invention relates to the field of internally convex ring parts, and particularly to a forming device for internally convex ring parts. Background Art

[0002] As Figure 6 shown, an internally convex ring part is an annular product with an outer shape of a ring 15 and a circle of internal convexities 16 in the middle of the inner hole. According to the requirements of its high-temperature environment of use, it generally needs to be forged to meet the use requirements. However, due to the complex shape of this part, it is difficult to form by conventional forging.

[0003] Currently, the conventional manufacturing method is generally as follows: First, the product is integrally forged into a regular annular blank, then the internal convexity 16 is machined, and finally it is processed to the final required dimensions. However, this method has a large machining allowance, low material utilization rate, low production efficiency, and high manufacturing cost; it causes relatively large machining stress, and it is difficult to control the final dimensional accuracy; after two processes of forging and machining, the product streamline is discontinuous, and there are many factors to be controlled, which in turn leads to unstable quality. Therefore, it is necessary to seek a new forming solution to enable the product to be formed quickly, maintain the continuity of the product streamline, improve the product quality, and reduce the machining allowance. Summary of the Invention

[0004] The present invention aims to provide a forming device for internally convex ring parts, enabling the product to be formed quickly, maintaining the continuity of the product streamline, improving the product quality, and reducing the machining allowance.

[0005] To achieve the above object, the present invention adopts the following technical solution: A forming device for internally convex ring parts includes an upper die and a lower die. The upper die can be pressed down twice. The lower side of the upper die is a flat pressing surface. When the upper die is pressed down for the first time, the flat pressing surface faces downward. There is a forming protrusion on the upper side of the upper die. When the upper die is pressed down for the second time, the upper die is flipped so that the forming protrusion faces downward. There is a forming groove on the lower die. The flat pressing surface can cover the forming groove, and the forming protrusion can be accommodated in the forming groove.

[0006] The beneficial effects of this solution are as follows:

[0007] 1. Forge an annular blank. After the blank is taken out of the furnace, it is placed in the forming groove. The upper die is pressed down twice. For the first time, the upper die is pressed down with the flat pressing surface facing downward until the flat pressing surface contacts the upper surface of the lower die, so that the lower part of the blank fills the forming groove. For the second time, the upper die is flipped so that the forming protrusion faces downward and presses down the blank until the lower surface of the upper die contacts the upper surface of the lower die, and a cavity is formed between the upper die and the lower die, and the blank fills the cavity and is thus formed.

[0008] 2. There is no need to machine the internal convexity, and the product can be formed quickly.

[0009] 3. Compared with the prior art which requires two processes, this solution only needs one process, with fewer quality factors to be controlled, maintaining the continuity of the product streamline and improving the product quality.

[0010] 4. Compared with the prior art, the size of the blank after forming is closer to the product, and the allowance generated by machining is greatly reduced.

[0011] 5. When the upper die presses down for the first time, the flat pressing surface is flat, will not generate lateral force on the blank, is not easy to extrude the blank out of the forming groove, improving the accuracy of the blank forming size and reducing the generated allowance; due to the flat pressing surface being flat, the downward pressure on the blank is more uniform, and then the density of the ring part after the blank is formed is more uniform, further improving the quality of the lower part of the blank forming.

[0012] 6. When the upper die presses down for the second time, since the mass of the upper die remains unchanged, the downward pressure on the lower part of the blank is similar to the first time. Since the limit positions of the two downward presses of the upper die remain unchanged and both stop after contacting the upper surface of the lower die, the lower part of the blank has been formed during the first downward press. Therefore, the second downward press has less impact on the ring part after the blank is formed, avoiding secondary stress on the ring part, with less change in the density of the ring part and more stable forming quality; since the blank is pressed to be parallel to the upper surface of the lower die during the first downward press, the lateral force of the formed convex side on the upper part of the blank is offset by the side wall of the forming groove, not easy to extrude the blank out of the forming groove, will not reduce the accuracy of the blank forming size, nor increase the generated allowance.

[0013] Preferably, as an improvement, the lower die includes a guide post, a spacer ring and a lower die sleeve. The spacer ring is sleeved on the guide post in a sliding connection manner, and the lower die sleeve is sleeved on the spacer ring in a sliding connection manner. The forming groove is surrounded by the guide post, the lower die sleeve and the spacer ring with gradually decreasing heights. With such a setting, it is convenient to remove the mold after the blank forms the inner convex platform ring. Specifically, first remove the upper die, the lower die sleeve and the spacer ring, and finally remove the inner convex platform ring from the guide post. Compared with using a fixture or bolt connection, it is more convenient and fast.

[0014] Preferably, as an improvement, the upper die is provided with a guide hole which penetrates through the flat pressing surface and the formed convex, and the guide hole passes through the guide post in a sliding connection manner. With such a setting, when the upper die presses down twice, it is guided by the guide post both times, ensuring that the upper die presses down vertically, making the downward pressure on the blank more uniform, and then making the density of each part of the blank more uniform, further improving the quality of the lower part of the blank forming.

[0015] Preferably, as an improvement, the guide post is formed by the rotation of a convex plane around the axis of symmetry. The guide post and the forming protrusion can cooperate with each other to form the inner boss. With this arrangement, when the upper die presses down for the second time, the forming protrusion and the guide post cooperate with each other to squeeze the inner side of the blank, improving the density of the inner side of the blank and enabling the rapid formation of the inner boss. After the inner boss is formed, it has a higher density than the ring part, so that the inner boss is not easily damaged during use due to its smaller size than the ring.

[0016] Preferably, as an improvement, a first guiding inclined surface with an outward expansion at the lower part is formed on the outer side of the lower part of the guide post. With this arrangement, during demolding, the contact area between the inner boss ring and the guide post is increased, facilitating the guide post to lift the inner boss ring upward and preventing damage to the inner boss ring due to too small a contact area.

[0017] Preferably, as an improvement, a second guiding inclined surface with an inward expansion at the lower part is formed on the inner side of the lower die sleeve. With this arrangement, it is convenient to install the lower die. Specifically, first place the spacer ring between the first guiding inclined surface and the second guiding inclined surface, and then press the spacer ring down along the first guiding inclined surface and the second guiding inclined surface, thereby pressing the guide post and the lower die sleeve tightly; the first guiding inclined surface, the second guiding inclined surface and the spacer ring form a forming groove. When the upper die presses down for the first time, since the cross-sectional area of the lower part of the forming groove is smaller than that of the upper part, the blank preferentially fills the lower part of the forming groove, preventing the upper part of the blank from being extruded out of the forming groove before the blank fills the forming groove, reducing the surplus and improving the forming accuracy.

[0018] Preferably, as an improvement, through holes are formed in the lower die sleeve. With this arrangement, the pin passes through the through holes and is stuck on the lower die sleeve, facilitating the hoisting of the lower die sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the three-dimensional axonometric drawing of the blank of the embodiment;

[0020] Figure 2 is the three-dimensional axonometric drawing of the embodiment before flipping the upper die;

[0021] Figure 3 is the three-dimensional axonometric drawing of the exploded structure of the lower die of the embodiment;

[0022] Figure 4 is the top view of the embodiment after flipping the upper die;

[0023] Figure 5 is Figure 4 the sectional view taken along A-A in

[0024] Figure 6 the sectional view of the inner boss ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following is a further detailed description through specific embodiments:

[0026] The reference numerals in the accompanying drawings of the specification include: blank 1, upper die 2, flat pressing surface 3, forming protrusion 4, guiding hole 5, lower die 6, guiding column 7, cushion ring 8, lower die sleeve 9, forming groove 10, first guiding inclined surface 11, second guiding inclined surface 12, through hole 13, cavity 14, inner convex platform 15, and ring part 16.

[0027] Embodiment

[0028] The embodiment is basically as Figure 2-5 shown: An inner convex platform ring part forming device includes an upper die 2 and a lower die 6. As Figure 1 shown, the processing object is the blank 1 of the inner convex platform ring part. As Figure 6 shown, the processed finished inner convex platform ring part includes an integrally formed inner convex platform 15 and a ring part 16.

[0029] As Figure 2 shown, the lower side of the upper die 2 is a flat pressing surface 3. An integrally formed forming protrusion 4 is provided on the upper side of the upper die 2. A guiding hole 5 is formed in the upper die 2. The guiding hole 5 is vertically arranged and penetrates through the flat pressing surface 3 and the forming protrusion 4.

[0030] As Figure 3 shown, the lower die 6 includes a guiding column 7, a cushion ring 8, and a lower die sleeve 9. The cushion ring 8 is sleeved on the guiding column 7 in a sliding connection manner. The lower die sleeve 9 is sleeved on the cushion ring 8 in a sliding connection manner. After the lower die 6 is installed, the lower surfaces of the guiding column 7, the cushion ring 8, and the lower die sleeve 9 are located on the same plane. The guiding column 7, the lower die sleeve 9, and the cushion ring 8 with decreasing heights enclose to form a forming groove 10; the flat pressing surface 3 can cover the forming groove 10, and the forming protrusion 4 can be accommodated in the forming groove 10.

[0031] As Figure 5 shown, the guiding column 7 passes through the guiding hole 5. The guiding column 7 is formed by the convex plane rotating 360° around the symmetry axis. The outer side of the lower part of the guiding column 7 forms a first guiding inclined surface 11 with an outward expansion at the lower part; two symmetrically arranged radial through holes 13 are formed in the lower die sleeve 9. The inner side of the lower die sleeve 9 forms a second guiding inclined surface 12 with an inward expansion at the lower part; the included angles between the first guiding inclined surface 11 and the second guiding inclined surface 12 and the vertical plane are both 2°. The bottoms of the first guiding inclined surface 11 and the second guiding inclined surface 12 are both higher than the upper surface of the cushion ring 8.

[0032] The centers of the upper die 2, the guiding column 7, the cushion ring 8, and the lower die sleeve 9 are located on the same straight line.

[0033] The specific implementation steps are as follows:

[0034] 1. First, place the guide post 7 vertically. Pass one end of the pin through the through hole 13 and latch it on the side wall of the lower die sleeve 9. The other end serves as the hanging part for lifting, and lift the lower die sleeve 9 so that the lower die sleeve 9 passes through the guide post 7. Place the cushion ring 8 between the lower die sleeve 9 and the guide post 7, and press the cushion ring 8 down along the first guide slope 11 and the second guide slope 12, thereby pressing the guide post 7 and the lower die sleeve 9 tightly together.

[0035] 2. Then, forge the annular blank 1 and place the blank 1 into the forming groove 10 after it is taken out of the furnace.

[0036] 3. Next, the upper die 2 is pressed down for the first time. Pass the upper die 2 through the guide post 7 and press the flat pressing surface 3 of the upper die 2 downward against the blank 1 until the flat pressing surface 3 contacts the upper surface of the lower die sleeve 9, so that the lower part of the blank 1 is filled in the forming groove 10.

[0037] 4. Then, the upper die 2 is pressed down for the second time. Withdraw the upper die 2 from the guide post 7, turn the upper die 2 over, and pass the upper die 2 through the guide post 7 again. Press the forming protrusion 4 downward against the blank 1 until the lower surface of the upper die 2 contacts the upper surface of the lower die sleeve 9. A cavity 14 is formed between the upper die 2, the guide post 7, the cushion ring 8 and the lower die sleeve 9, and the blank 1 is filled in the cavity 14, thereby forming an inner convex platform ring part.

[0038] 5. Finally, remove the upper die 2, the lower die sleeve 9 and the cushion ring 8 in sequence, and finally remove the inner convex platform ring part from the guide post 7.

[0039] 6. Process according to the usage requirements and adjust the size of the inner convex platform ring part to form the final product.

[0040] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. An inner convex platform ring forming device, characterized in that: It includes an upper die and a lower die. The upper die can be pressed down twice. The lower side of the upper die is a flat pressing surface. When the upper die is pressed down for the first time, the flat pressing surface faces downward. There is a forming protrusion on the upper side of the upper die. When the upper die is pressed down for the second time, the upper die is flipped, and the forming protrusion faces downward. There is a forming groove on the lower die. The flat pressing surface can cover the forming groove, and the forming protrusion can be accommodated in the forming groove; The lower die includes a guide post, a spacer ring, and a lower die sleeve. The spacer ring is slidably sleeved on the guide post, and the lower die sleeve is slidably sleeved on the spacer ring. The forming groove is surrounded by the guide post, the lower die sleeve, and the spacer ring with gradually decreasing heights; There is a guide hole on the upper die, which penetrates through the flat pressing surface and the forming protrusion, and the guide post can pass through the guide hole; The guide post is formed by the rotation of a convex plane around the axis of symmetry. The guide post and the forming protrusion can cooperate with each other to form an inner convex platform; A first guiding inclined surface with an outward expansion at the lower part is formed on the outer side of the lower part of the guide post; A second guiding inclined surface with an inward expansion at the lower part is formed on the inner side of the lower die sleeve; There is a through hole on the lower die sleeve.

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