Auxiliary device for pressing small-opening large-angle cone
By using concentricly arranged concave die and punch auxiliary devices in the manufacturing of boiler pressure vessels, and using a hydraulic press for pressing, the problem that small mouths and large angle cones cannot be directly rolled and molded is solved, and high-quality, smooth molding and efficient pressing process are achieved.
Patent Information
- Application Number
- CN202422189375.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-06
AI Technical Summary
During the manufacturing process of boiler pressure vessels, there is a problem that the small mouth and large angle cone cannot be directly formed by rolling the plate machine, resulting in unsmooth surface, poor molding quality and inconvenient use.
The concentric die and punch auxiliary device are used to perform preliminary pressing and precision pressing through a hydraulic press, and the cone is uniformly pressed by multiple inclined dies and punch stamps to ensure smooth surfaces and accurate angles.
The molding quality and surface smoothness of the small mouth and large angle cone are improved, the operation process is simplified, the molding difficulty is reduced, the pressing efficiency is improved, and the demand for mass production can be met.
Smart Images
Figure CN222999526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cone pressing forming, and particularly relates to an auxiliary device for pressing a small-mouth large-angle cone. Background Art
[0002] The cone is a common component of boiler pressure vessels. The traditional cone forming generally adopts the method of equal-angle bending on a fan-shaped workpiece by hand, a bending machine or a press. At present, the method of directly rolling and forming on a rolling machine is generally adopted. This method is applicable to the situation where the overall size of the cone is small and the size of the small end of the cone is large enough. However, in the actual manufacturing process of boiler pressure vessels, small-mouth large-angle cones are often encountered. These cones cannot be directly rolled and formed by a rolling machine due to the too small diameter of their small ports or the limitation of the capabilities of equipment such as rolling machines. At this time, a suitable auxiliary device is needed to facilitate the pressing and forming of these small-mouth large-angle cones and meet the manufacturing requirements of pressure vessels. However, the current auxiliary devices for pressing small-mouth large-angle cones often have the following problems in the use process: First, the surface of the cone is not smooth after forming, and the forming quality is not good; second, there are problems of inconvenient use and great difficulty in cone forming, resulting in low forming efficiency of the cone. Therefore, it is objectively necessary to develop an auxiliary device for pressing small-mouth large-angle cones that is easy to use, can improve the forming quality, and can reduce the forming difficulty. Summary of the Utility Model
[0003] The purpose of the utility model is to provide an auxiliary device for pressing a small-mouth large-angle cone that is easy to use, can improve the forming quality, and can reduce the forming difficulty.
[0004] The purpose of the utility model is realized as follows. It includes a concave die and a convex die arranged concentrically. The concave die includes a bottom plate and several concave die pressing pieces evenly arranged in a circumferential direction on the bottom plate. The upper end surface of the concave die pressing piece is inclined, and the higher end of the upper end surface of the concave die pressing piece faces outward, and the lower end faces inward. An annular hoop is arranged outside several concave die pressing pieces. The convex die includes a core cylinder and several convex die pressing pieces evenly arranged on the side wall of the core cylinder. The lower end surface of the convex die pressing piece is parallel to the upper end surface of the concave die pressing piece. An annular fixing ring is arranged above several convex die pressing pieces.
[0005] Further, a top plate is arranged at the top of the core cylinder.
[0006] Further, the number of the concave die pressing pieces and the convex die pressing pieces is the same, and both are 12 - 24 pieces.
[0007] Further, a fine shaping assembly is arranged between the concave die pressing piece and the convex die pressing piece. The fine shaping assembly includes a fine shaping ring and several fine shaping pressing pieces evenly arranged on the fine shaping ring. The lower end surface of the fine shaping pressing piece is parallel to the upper end surface of the concave die pressing piece.
[0008] Furthermore, fixing blocks are arranged on the upper end surfaces of each female die pressing piece.
[0009] Furthermore, the included angle between the upper end surface of the female die pressing piece and the vertical center line is α, and α is 65° - 85°.
[0010] The utility model is applicable to the auxiliary pressing of small - mouth large - angle cones. During use, first cut the material according to the dimensions after lofting of the small - mouth large - angle cone. Since the apex angle of the cone is relatively large and the fan - ring notch after lofting and unfolding is relatively small, place the cut fan - ring between the female die and the male die, and use a hydraulic press for preliminary pressing. At this time, the female die is placed on the workbench of the hydraulic press, and the pressure plate of the hydraulic press moves downward driven by the oil cylinder. After contacting the upper end of the core cylinder of the male die, it drives the male die to continue pressing downward, applying pressure to the fan - ring. The fan - ring deforms under pressure, and the distance between the two ends of the fan - ring gradually shrinks until they close. After the pressure plate of the hydraulic press moves upward and away, remove the male die, and perform butt - welding on the closed weld to complete the preliminary pressing of the cone. Subsequently, continue to press the preliminarily formed cone, and use the female die pressing piece and the male die pressing piece to perform fine pressing on the cone. During the pressing process of the cone, the cone can be appropriately rotated to ensure the roundness and smoothness of the overall cone, so that the cone meets the usage requirements, and take out the cone after fine pressing and shape correction for standby. During the pressing process of the above - mentioned small - mouth large - angle cone, due to the arrangement of a relatively large number of female die pressing pieces and male die pressing pieces, the pressing positions of the cone are relatively evenly distributed, the force on the cone is relatively average and the pressure is dispersed around the cone, which can effectively ensure the smoothness of the surface of the cone after forming, and the forming quality is good. And because the inclination angles of the female die pressing piece and the male die pressing piece are the same, and the fan - ring is placed between them for pressing, the angle of the formed cone is relatively accurate and can meet the installation requirements of the cone. Secondly, when using this device to press the small - mouth large - angle cone, only need to place the cut fan - ring between the female die and the male die and use a hydraulic press for pressing, the operation process is relatively simple and convenient, the forming difficulty of the cone is small, and the pressing efficiency is relatively high, which can meet the pressing of a batch of small - mouth large - angle cones. To sum up, the utility model has the advantages of convenient use, can improve the forming quality, and can reduce the forming difficulty. Brief Description of the Drawings
[0011] Figure 1 is the front - view structural schematic diagram of the utility model;
[0012] Figure 2 is the top - view structural schematic diagram of the utility model after removing the top plate 7;
[0013] Figure 3 is the structural schematic diagram of the fine - shaping assembly in the utility model;
[0014] In the figure: 1 - bottom plate, 2 - concave die pressing piece, 3 - hoop, 4 - core barrel, 5 - convex die pressing piece, 6 - fixing ring, 7 - top plate, 8 - precision shaping ring, 9 - precision shaping pressing piece, 10 - fixing block, 11 - cone. Specific implementation manner
[0015] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any change or improvement based on the present invention belongs to the protection scope of the present invention.
[0016] As Figures 1 to 3 shown, the present invention includes a concentrically arranged concave die and convex die. The concave die includes a bottom plate 1 and a plurality of concave die pressing pieces 2 evenly arranged in a circle on the bottom plate 1. The upper end surface of the concave die pressing piece 2 is inclined, and the higher end of the upper end surface of the concave die pressing piece 2 faces outward, and the lower end faces inward. An annular hoop 3 is arranged outside the plurality of concave die pressing pieces 2. The hoop 3 is used to limit and fix the plurality of concave die pressing pieces 2, improve the overall stiffness and strength of the entire concave die, prevent the concave die from deforming, and improve the service life of the concave die. The convex die includes a core barrel 4 and a plurality of convex die pressing pieces 5 evenly arranged in a circle on the side wall of the core barrel 4. The lower end surface of the convex die pressing piece 5 is parallel to the upper end surface of the concave die pressing piece 2. An annular fixing ring 6 is arranged above the plurality of convex die pressing pieces 5. The fixing ring 6 is used to limit and fix the plurality of convex die pressing pieces 5, improve the overall stiffness and strength of the entire convex die, prevent the convex die from deforming, and improve the service life of the convex die.
[0017] The utility model is applicable to the auxiliary pressing of a small-mouth large-angle cone 11. During use, first cut the material according to the dimensions after lofting the small-mouth large-angle cone 11. Since the apex angle of the cone 11 is relatively large and the fan-ring notch after lofting and unfolding is relatively small, place the cut fan ring between the female die and the male die, and use a hydraulic press for preliminary pressing. At this time, the female die is placed on the working table of the hydraulic press, and the pressure plate of the hydraulic press moves downward under the drive of the oil cylinder. After contacting the upper end of the core cylinder 4 of the male die, it drives the male die to continue pressing downward, applying pressure to the fan ring. The fan ring deforms under pressure, and the distance between the two ends of the fan ring gradually shrinks until they close. After the pressure plate of the hydraulic press moves upward and away, remove the male die, and perform butt welding on the closed weld to complete the preliminary pressing of the cone 11. Subsequently, continue to press the preliminarily formed cone 11, and use the female-die pressing piece 2 and the male-die pressing piece 5 to finely press the cone 11. During the pressing process of the cone 11, the cone 11 can be appropriately rotated to ensure the roundness and smoothness of the overall cone 11, so that the cone 11 meets the usage requirements, and take out the cone 11 after fine pressing and shape correction for standby. During the pressing process of the above-mentioned small-mouth large-angle cone 11, due to the setting of a relatively large number of female-die pressing pieces 2 and male-die pressing pieces 5, the pressing positions of the cone 11 are relatively evenly distributed, the cone 11 is subjected to relatively average force and the pressure is dispersed around the cone 11, which can effectively ensure the smoothness of the surface of the cone 11 after forming, and the forming quality is better. And because the inclination angles of the female-die pressing piece 2 and the male-die pressing piece 5 are the same, and the fan ring is pressed between the two, the angle of the formed cone 11 is relatively accurate, which can meet the installation requirements of the cone 11; secondly, when using this device to press the small-mouth large-angle cone 11, only need to place the cut fan ring between the female die and the male die and use a hydraulic press for pressing, the operation process is relatively simple and convenient, the forming difficulty of the cone 11 is small, and the pressing efficiency is relatively high, which can meet the pressing requirements of a batch of small-mouth large-angle cones 11.
[0018] A top plate 7 is provided at the top of the core cylinder 4. When pressing the cone 11, the pressure plate of the hydraulic press abuts against the upper end of the core cylinder 4. However, since the contact area between the upper end of the core cylinder 4 and the pressure plate is relatively small, in actual use, there may be a problem of slipping, resulting in the skew of the male die, affecting the pressing quality of the cone 11 and having a certain potential safety hazard. In order to solve this problem, the top plate 7 is provided. The top plate 7 has a relatively large contact area with the pressure plate, thereby improving the stability and safety during the pressing and forming of the cone 11.
[0019] The number of the female-die pressing pieces 2 and the male-die pressing pieces 5 is the same, both being 12 to 24 pieces. The female-die pressing pieces 2 and the male-die pressing pieces 5 are in direct contact with the cone 11 and press and form the cone 11. In order to achieve a better pressing effect of the cone 11, the number of the female-die pressing pieces 2 and the male-die pressing pieces 5 is often relatively large. Generally, according to the diameter of the cone 11 and the limitation requirements of the structure of this device itself, it can be set to 12 to 24 pieces. The specific number is determined according to the actual situation as long as it can have a better pressing effect on the cone 11.
[0020] A fine shaping component is arranged between the female die pressing piece 2 and the male die pressing piece 5. The fine shaping component includes a fine shaping ring 8 and a number of fine shaping pressing pieces 9 evenly arranged on the fine shaping ring 8 in a circumferential manner. The lower end surface of the fine shaping pressing piece 9 is parallel to the upper end surface of the female die pressing piece 2. During the pressing process of the cone 11, it is found that after the pressing of the cone 11 is completed, there are still problems such as non-smooth transition in some local areas of the cone 11. Even if the fine calibration is repeated many times, the problem cannot be eliminated. Therefore, the fine shaping component is set. The fine shaping component is placed between the cone 11 and the male die. When in use, the male die pressing piece 2 abuts against the fine shaping ring 8, and the fine shaping pressing piece 9 presses on the cone 11. Since the contact area between the fine shaping pressing piece 9 and the cone 11 is smaller, when the fine shaping pressing piece 9 contacts the non-smooth part of the cone 11, the force can be concentrated to press this area, so as to achieve the purpose of fine shaping the cone 11, and then eliminate the problem of non-smooth transition in some local areas of the cone 11, improve the pressing quality of the cone 11, and ensure that the cone 11 can meet the subsequent requirements of group welding and use requirements.
[0021] A fixing block 10 is arranged on the upper end surface of each female die pressing piece 2. During the actual pressing process, the fixing block 10 is located at a position close to the lower part of the upper end surface of the female die pressing piece 2, and the number is generally not less than 3 pieces, which is used to limit the lower port of the cone 11. During pressing, the lower port of the cone 11 abuts against the fixing block 10. On the one hand, it ensures the small port size of the cone 11 after pressing and forming. On the other hand, it prevents the cone 11 from being skewed and displaced during the pressing process, and improves the forming quality of the cone 11.
[0022] The included angle between the upper end surface of the female die pressing piece 2 and the vertical center line is α, and α is 65° - 85°. This device is suitable for the auxiliary pressing of small-port large-angle cones 11, and can be used for the pressing and forming of small-port cones 11 with the apex angle in the range of 130° - 170°. Theoretically, the larger the apex angle of the cone 11, the better the pressing effect.
[0023] The structure of this device is simple, with less consumables, and it can be made of waste materials in the factory, with a low production cost. It can be used repeatedly for many times. And through practical verification, the company used the cone pressing device described in the present utility model to press a batch of small-port cones with a 135° apex angle. The small port diameter of the cone is φ290mm, the cone height is 135mm, and the cone thickness is 14mm. After being pressed and formed by this device, the forming quality is good, the smoothness of the cone is good, and the pressing and forming efficiency is high. The cone can meet the subsequent requirements of group welding.
Claims
1. An auxiliary device for pressing a small-mouth large-angle cone, comprising a concentrically arranged die and a punch, characterized in that The concave die comprises a bottom plate (1) and a plurality of concave die pressing sheets (2) uniformly arranged on the bottom plate (1); the upper end surface of the concave die pressing sheet (2) is inclined, and the upper end surface of the concave die pressing sheet (2) faces outwards at the higher end and faces inwards at the lower end; an annular hoop (3) is arranged on the outer side of the plurality of concave die pressing sheets (2); the convex die comprises a core barrel (4) and a plurality of convex die pressing sheets (5) uniformly arranged on the side wall of the core barrel (4); the lower end surface of the convex die pressing sheet (5) is parallel to the upper end surface of the concave die pressing sheet (2); and an annular fixing ring (6) is arranged on the upper side of the plurality of convex die pressing sheets (5).
2. The auxiliary device for pressing a small-mouth large-angle cone according to claim 1, characterized in that A top plate (7) is provided on the top of the core barrel (4).
3. The auxiliary device for pressing a small-mouth large-angle cone according to claim 1, characterized in that The number of the concave die pressing sheets (2) and the convex die pressing sheets (5) is the same, both being 12 to 24 pieces.
4. The auxiliary device for pressing a small-mouth large-angle cone according to claim 1, characterized in that A finishing shape component is provided between the concave die pressing sheet (2) and the convex die pressing sheet (5), the finishing shape component comprising a finishing shape ring (8) and a plurality of finishing shape pressing sheets (9) circumferentially evenly arranged on the finishing shape ring (8), the lower end surface of the finishing shape pressing sheet (9) being parallel to the upper end surface of the concave die pressing sheet (2).
5. The auxiliary device for pressing a small-mouth large-angle cone according to claim 1, characterized in that A fixing block (10) is arranged on the upper end surface of each concave die pressing sheet (2).
6. The auxiliary device for pressing a small-mouth large-angle cone according to claim 1, characterized in that The angle between the upper end surface of the concave die pressing sheet (2) and the vertical center line is α, and α is 65° to 85°.