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CN-121797830-B - C-shaped sealing ring composite soft mold bulging device and method

CN121797830BCN 121797830 BCN121797830 BCN 121797830BCN-121797830-B

Abstract

The invention discloses a C-shaped seal ring composite soft mold bulging device and a method, comprising a first mold component and a second mold component, the first die assembly comprises two first die holders, two first dies and a first elastic column, and the second die assembly comprises two second die holders, two second dies, a mud-like material and a second elastic column. The C-shaped sealing ring is formed in two steps, the first die assembly swells the blank into a preformed piece through the first elastic column, and the second die assembly swells the preformed piece into a finished product through the mud-shaped material and the second elastic column. According to the C-shaped sealing ring composite soft mold bulging device and method, on one hand, the sealing requirement on the bulging device is reduced, so that the structure of the bulging device is simplified, the cost of the bulging device is reduced, and on the other hand, the forming quality of the C-shaped sealing ring is improved, the loss of a first elastic column and a second elastic column is reduced due to twice forming, and the cost is further reduced.

Inventors

  • WANG CHUNJU
  • CHENG LIDONG
  • LIANG QIZHEN

Assignees

  • 苏州大学

Dates

Publication Date
20260512
Application Date
20260310

Claims (7)

  1. 1. A C-shaped seal ring composite soft mold bulging apparatus for bulging a blank into a preform and bulging the preform into a finished product, characterized in that the C-shaped seal ring composite soft mold bulging apparatus comprises: The first die assembly comprises two first die holders, two first dies and a first elastic column, wherein the two first die holders are oppositely arranged, the two first dies are arranged between the two first die holders and are respectively connected with the two first die holders, each first die is provided with a first die hole, the orifice of each first die hole is provided with a first concave structure, two ends of the first elastic column along the axial direction are respectively positioned in the first die holes of the two first dies, when the two first dies are clamped, the first concave structures of the two first dies are combined to form a first imitation groove, the groove wall of the first imitation groove can be in seamless fit with the outer side face of a preformed piece, and the first elastic column is deformed and can be filled with the inner side groove of the preformed piece positioned in the first imitation groove; The second die assembly comprises two second die holders, two second dies, a mud-shaped material and a second elastic column, wherein the two second die holders are oppositely arranged, the two second dies are arranged between the two second die holders and are respectively connected with the two second die holders, each second die is provided with a second die hole, the orifice of each second die hole is provided with a second concave structure, two ends of the second elastic column in the axial direction are respectively positioned in the second die holes of the two second dies, when the two second dies are clamped, the second concave structures of the two second dies are combined to form a second imitation groove, the groove wall of the second imitation groove can be in seamless joint with the outer side face of a finished product, and the second elastic column is deformed and can be filled with an inner side groove which is positioned in the second imitation groove and is provided with the finished product of the mud-shaped material; The first elastic column and the second elastic column are made of rubber, the hardness of the rubber is 20-60 Shore A, the mud-shaped material is plasticine, and the notch of each of the first imitation groove and the second imitation groove is provided with a positioning step.
  2. 2. The C-shaped seal ring composite soft mold bulging device according to claim 1, wherein the cross section of each groove cavity of the first and second imitation grooves at any position along the circumferential direction is a circular segment, the length of the arc-shaped side of the cross section of the first imitation groove is smaller than the length of the arc-shaped side of the cross section of the second imitation groove, the central angle of the arc-shaped side of the cross section of the first imitation groove is not larger than 180 degrees, and the central angle of the arc-shaped side of the cross section of the second imitation groove is larger than 180 degrees.
  3. 3. The C-seal ring composite soft mold bulging device according to claim 1, wherein the first mold is connected to the first mold base by a first spring which applies an elastic force toward the other of the first mold to the first mold, the second mold is connected to the second mold base by a second spring which applies an elastic force toward the other of the second mold to the second mold.
  4. 4. The C-seal ring composite soft mold bulging device according to claim 1, wherein the two first mold bases are arranged up and down, the two first molds are arranged up and down, the two second mold bases are arranged up and down, and the two second molds are arranged up and down.
  5. 5. The C-shaped seal ring composite soft mold bulging method is characterized by comprising the following steps of: S1, providing a blank and the C-shaped seal ring composite soft mold bulging device according to any one of claims 1 to 4; S2, performing primary bulging, namely firstly placing a blank in a first concave structure of one first die to perform preset positioning, then placing a first elastic column into an axial through hole of the blank, then performing pre-die assembly on the two first dies, respectively positioning two ends of the blank along the axial direction by the first concave structure of the two first dies, continuously die assembly on the two first dies until the two first dies are completely die-assembled, extruding the first elastic column by using the die assembly force, and bulging the blank into a preformed piece under the pressure of the first elastic column and under the constraint of the first profiling groove; S3, performing secondary bulging, namely firstly placing a mud-shaped material into an inner side circumferential groove of a preformed piece, then placing the preformed piece into a second concave structure of one second die to perform preset positioning, then placing a second elastic column into an axial through hole of the preformed piece, then performing pre-clamping on the two second dies, respectively positioning two ends of the preformed piece along the axial direction by the second concave structures of the two second dies, then continuing clamping until the two second dies are completely clamped, extruding the second elastic column by the clamping force, performing bulging on the preformed piece into a finished product under the pressure of the second elastic column and under the constraint of the second imitation groove, then performing die opening on the two second dies, recovering the shape of the second elastic column, then taking out the mud-shaped material, the second elastic column and the finished product from the second die, and finally taking out the mud-shaped material from the inner side circumferential groove of the finished product.
  6. 6. The C-seal ring composite soft mold bulging method according to claim 5, wherein the two first mold bases are arranged up and down, the two second mold bases are arranged up and down, and the two second mold bases are arranged up and down; In the step S2, the blank is placed in a first concave position structure of a first die at the lower side for pre-positioning, the loading equipment drives the first die holder and the first die at the upper side to descend for die assembly, and the loading equipment drives the first die holder and the first die at the upper side to ascend for die opening; In the step S3, the preformed piece is placed in a second concave structure of a second die at the lower side to be positioned in advance, the loading equipment drives the second die holder at the upper side and the second die to be clamped, and the loading equipment drives the second die holder at the upper side and the second die to be lifted to open the die.
  7. 7. The C-ring seal composite soft mold bulging process according to claim 6, wherein the blank is heat treated before the primary bulging and the preform is annealed before the secondary bulging.

Description

C-shaped sealing ring composite soft mold bulging device and method Technical Field The invention relates to the technical field of forming, in particular to a C-shaped sealing ring composite soft mold bulging device and method. Background The high-temperature and high-pressure sealing requirements of engines, nuclear power and the like bring great challenges to the sealing technology. Common organic polymer material sealing elements such as rubber are difficult to bear high Wen Keke working conditions of hundreds of degrees or even thousands of degrees, and sealing elements such as graphite can bear high-temperature working conditions, but the application range is limited due to the defects of high-temperature oxidation resistance, adjustable flexibility and the like. The high-temperature alloy thin wall and the special-shaped sealing ring have the advantages of high temperature resistance, good sealing performance, adjustable flexibility and the like, and have wide application in the fields of engines, nuclear power and the like. The C-shaped sealing ring is a high-temperature alloy component, the section of the C-shaped sealing ring is a letter C, the whole sealing ring is annular, and the wall thickness is 0.1-1.0mm. On the one hand, the opening of the C-shaped sealing ring is a negative angle, so that defects such as wrinkling, shape distortion and the like can be generated during forming, and the inside of the C-shaped sealing ring needs to be supported, on the other hand, the small diameter of the C-shaped sealing ring leads to extremely small opening size, usually less than 1.0mm, and the inside support is extremely difficult to apply and take out. Therefore, in the prior art, a C-shaped sealing ring is formed by liquid media such as hydraulic bulging, which also involves the problems of high-pressure sealing, high liquid pressure and the like, so that a forming system is complex and high in cost, and in addition, in order to realize high-pressure reliable sealing, the sealing area is relatively large in size, so that the material utilization rate is extremely low, for example, the utilization rate of a certain product is less than 30%. In the bulging process of the C-shaped sealing ring, how to simplify the structure of the bulging device and reduce the cost of the bulging device, and the internal support in the forming process is easy to take and place is a technical problem to be solved in the field. Disclosure of Invention Therefore, the invention provides the C-shaped sealing ring composite soft mold bulging device and the method, which simplify the structure of the bulging device, reduce the cost of the bulging device and facilitate the taking and placing of the inner support in the forming process. In order to solve the technical problems, the invention provides a C-shaped seal ring composite soft mold bulging device for bulging a blank into a preform and bulging the preform into a finished product, which is characterized in that the C-shaped seal ring composite soft mold bulging device comprises: The first die assembly comprises two first die holders, two first dies and a first elastic column, wherein the two first die holders are oppositely arranged, the two first dies are arranged between the two first die holders and are respectively connected with the two first die holders, each first die is provided with a first die hole, the orifice of each first die hole is provided with a first concave structure, two ends of the first elastic column along the axial direction are respectively positioned in the first die holes of the two first dies, when the two first dies are clamped, the first concave structures of the two first dies are combined to form a first imitation groove, the groove wall of the first imitation groove can be in seamless fit with the outer side face of a preformed piece, and the first elastic column is deformed and can be filled with the inner side groove of the preformed piece positioned in the first imitation groove; The second die assembly comprises two second die holders, two second dies, a mud-shaped material and a second elastic column, wherein the two second die holders are oppositely arranged, the two second dies are arranged between the two second die holders and are respectively connected with the two second die holders, each second die is provided with a second die hole, the orifice of each second die hole is provided with a second concave structure, two ends of the second elastic column along the axial direction are respectively positioned in the second die holes of the two second dies, when the two second dies are clamped, the second concave structures of the two second dies are combined to form a second imitation groove, the groove wall of the second imitation groove can be in seamless joint with the outer side face of a finished product, and the second elastic column is deformed and can be filled with an inner side groove of the finished product which is position