Bending forming device

Abstract

The application discloses a bending forming device for forming a half-slot shell, and the bending forming device comprises a positioning mechanism, a concave die and a convex die which are oppositely arranged, a V-shaped groove is formed on the side of the concave die which faces the convex die, a first recess is formed on the side of the concave die which is away from the convex die, a second recess is arranged on the side of the convex die which is away from the concave die, a V-shaped protrusion is arranged on the side of the convex die which is close to the concave die, and the positioning mechanism comprises a front end face which is arranged towards the concave die and the convex die. The bending forming device is used for positioning the plate by the front end face, and the plate is bent by the V-shaped protrusion and the V-shaped groove in alignment, so that the half-slot shell is formed, and the size and tolerance requirements of the half-slot shell are controlled.

Description

Technical Field

[0001] This invention relates to the field of reactor pressure vessel manufacturing technology, and in particular to a bending and forming device for a half-shell of an irradiation monitoring tube. Background Technology

[0002] The irradiation monitoring tube is a key component of reactor irradiation monitoring. The monitoring tube includes a half-shell, which is a critical component. The forming of the half-shell is very important. The perpendicularity between the surfaces of the half-shell, the inner bending angle, and the outer bending angle have high requirements, and traditional stretch forming processes cannot meet these requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a bending forming device to solve the problem of difficult stamping forming of the semi-groove shell of the irradiation monitoring tube.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This invention provides a bending forming apparatus for forming a semi-groove shell, comprising: a positioning mechanism, a die and a punch disposed opposite to each other; the die has a V-shaped groove on the side facing the punch, and a first groove on the side away from the punch; the punch has a second groove on the side away from the die; the punch has a V-shaped protrusion on the side close to the die; the positioning mechanism includes a front end face, which is disposed facing the die and the punch.

[0006] In some embodiments, the die cavity is further provided with a relief groove, which is located at one end of the V-groove away from the punch, and the relief groove is connected to the V-groove.

[0007] In some embodiments, the straightness of the V-groove is less than or equal to 0.01 mm.

[0008] In some embodiments, the angle of the V-groove ranges from 86° to 88°.

[0009] In some embodiments, the V-shaped protrusion has a rounded corner on the cross-section along the length of the punch, and the rounded corner value ranges from R0.2 to R0.3.

[0010] In some embodiments, the straightness of the front end face is less than or equal to 0.01 mm.

[0011] In some embodiments, the parallelism between the V-groove, the V-protrusion, and the front end face is less than or equal to 0.015 mm.

[0012] In some embodiments, the semi-groove shell has an inner bend and an outer bend, both of which include rounded corners. The rounded corner value of the inner bend is less than or equal to R0.7, and the rounded corner value of the outer bend is less than or equal to R0.4.

[0013] In some embodiments, the straightness of the semi-groove shell along its length is less than or equal to 0.5 mm.

[0014] In some embodiments, the semi-groove shell has a height H and a width W, satisfying: H = 12.85 mm to 13.00 mm, W = 30.3 mm to 30.6 mm.

[0015] The bending forming device of this application has the following advantages: The bending forming device includes a positioning mechanism, a die and a punch arranged opposite each other. A V-groove is formed on the side of the die facing the punch, and a first groove is formed on the side of the die away from the punch, used to position and lock the die. A second groove is formed on the side of the punch away from the die, used to position and lock the punch. A V-shaped protrusion is formed on the side of the punch close to the die. The alignment of the V-shaped protrusion with the V-groove is used to bend the sheet metal to form a semi-groove shell. The positioning mechanism includes a front end face facing the die and punch, used to push and position the sheet metal. Thus, the bending forming device achieves positioning of the sheet metal through the positioning mechanism, and bending and limiting through the punch, achieving the bending forming of the semi-groove shell, meeting the dimensional and tolerance requirements of the semi-groove shell. When bending the sheet metal, the positioning mechanism, punch, and die work together to control the width, height, and verticality of the semi-groove shell. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the bending and forming device in an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A schematic diagram of the outer shape of the middle die;

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross-section of the middle die;

[0019] Figure 4 yes Figure 1 A schematic diagram of the outer shape of the central punch;

[0020] Figure 5 yes Figure 4 A schematic diagram of the cross-section of the middle punch;

[0021] Figure 6 yes Figure 1 A schematic diagram of the external shape of the positioning mechanism;

[0022] Figure 7yes Figure 6 Top view of the positioning mechanism;

[0023] Figure 8 This is an enlarged cross-sectional schematic diagram of the positioning mechanism;

[0024] Figure 9 This is a schematic diagram of the structure of the semi-groove shell formed by bending according to an embodiment of this application;

[0025] The labels in the diagram are as follows: 1-plate, 100-positioning mechanism, 101-positioning plate, 102-bolt, 110-front end face, 200-die, 210-V-groove, 220-first groove, 300-punch, 310-second groove, 320-V-shaped protrusion, 321-rounded corner, 400-half-groove shell, 401-inner bend, 402-outer bend. Detailed Implementation

[0026] The following describes specific embodiments of the bending and forming apparatus of the present invention with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] See Figure 1 and Figure 9 This application discloses a bending forming apparatus for bending a semi-groove shell 400 for irradiation monitoring pipes. Specifically, the bending forming apparatus is used to process a sheet metal 1 into a semi-groove shell 400. The semi-groove shell 400 includes an inner bending angle 401 and an outer bending angle 402. The bending forming apparatus includes a positioning mechanism 100, a die 200, and a punch 300. A V-shaped groove 210 is formed on the side of the die 200 facing the punch 300, and a first groove 220 is formed on the side of the die 200 away from the punch 300. A second groove 310 is formed on the side of the punch 300 away from the die 200. A V-shaped protrusion 320 is formed on the side of the punch 300 close to the die 200. The positioning mechanism 100 includes a front end face 110, which faces the die 200 and the punch 300.

[0028] The bending forming apparatus provided in this application utilizes a die 200 and a punch 300 arranged opposite to each other. A V-groove 210 is formed on the side of the die 200 facing the punch 300, and a first groove 220 is formed on the side of the die 200 away from the punch 300, which is used to position and lock the die 200. A second groove 310 is formed on the side of the punch 300 away from the die 200, which is used to position and lock the punch 300. A V-shaped protrusion 320 is formed on the side of the punch 300 close to the die 200. The V-shaped protrusion 320 and the V-groove 210 are used to... The positioning mechanism 100 includes a front end face 110 facing the die 200 and the punch 300. The front end face 110 is used to push and position the sheet 1. Thus, the bending forming device uses the positioning mechanism 100 to position the sheet 1 and the punch 300 to bend and limit the bending, thereby achieving the bending and forming of the semi-groove shell 400 and meeting the dimensional and tolerance requirements. When bending the sheet 1, the positioning mechanism 100, the punch 300 and the die 200 work together to control the width, height and verticality of the semi-groove shell 400. Conversely, if the V-groove 210 of the die 200, the V-protrusion 320 of the punch 300, and the front end face 110 of the positioning mechanism 100 are not provided, the positioning mechanism 100 cannot be used to position the sheet metal 1, the die 200 cannot be accurately aligned with the punch 300, and the punch 300 cannot accurately bend the sheet metal 1. Therefore, the bending forming apparatus of this application can achieve precise bending forming of the semi-groove shell 400.

[0029] like Figure 2 and Figure 3 As shown, the die 200 is a slender mold with a hardness of HRC58-62 after heat treatment. The cross-section of the die 200 along its length is U-shaped. The die 200 is fixed and locked to a precision bending machine tool via a first groove 220. There are two V-grooves 210, which correspond to the inner bending angle 401 and outer bending angle 402 of the semi-groove shell 400, respectively. The die 200 also has a relief groove 211 connected to each V-groove 210. The relief groove 211 is located at the bottom of the tip of the V-groove 210, with a width of 1 mm and a depth of 0.5 mm.

[0030] In some embodiments of this application, the straightness of the V-groove 210 is less than or equal to 0.01 mm, the angle range of the V-groove 210 is 86° to 88°, and the angle of the V-groove 210 is further preferably 87°.

[0031] like Figure 4 and Figure 5As shown, the punch 300 includes two slender die-cutting pieces with identical cross-sections and equal lengths. The two die-cutting pieces are joined to form a V-shaped protrusion 320. The material of the punch 300 has a hardness of HRC63-67 after heat treatment. The cross-section of the punch 300 is eccentric. The punch 300 is connected to a precision bending machine tool via a second groove 310 to achieve fixation and straightness adjustment. The V-shaped protrusion 320 extends towards the die 200. The straightness of the V-shaped protrusion 320 is less than or equal to 0.01 mm. The angle of the V-shaped protrusion 320 matches that of the punch 300. The V-shaped protrusion 320 has a fillet 321 on its cross-section along the length of the punch 300. The fillet value of the fillet 321 is R0.2~R0.3, preferably R0.25.

[0032] After the die 200 is assembled, it is fixed and locked. After the punch 300 is assembled, the straightness of the V-shaped protrusion 320 of the punch 300 is adjusted so that the V-shaped groove 210 of the die 200 and the V-shaped protrusion 320 of the punch 300 can be safely overlapped. The angle value of the V-shaped groove 210 and the fillet value of the V-shaped protrusion 320 are affected by factors such as the thickness of the part material and the elasticity of the material.

[0033] like Figures 6-8 As shown, the positioning mechanism 100 includes two positioning plates 101, both of which are identical square structural components. Each positioning plate 101 has two stepped sections for bending the inner bending angle 401 and outer bending angle 402 of the semi-groove shell 400, respectively. The positioning plates 101 are used for assembly with the limiting position of a precision bending machine tool. Each positioning plate 101 includes a front end face 110 and is connected to bolts 102. The straightness of the front end face 110 of the positioning plate 101 is adjusted by the bolts 102 to ensure that the straightness of the front end face 110 is less than or equal to 0.01 mm. When bending the sheet metal 1, a forward-pushing positioning method is used to position the sheet metal 1. Specifically, the sheet metal 1 is pushed forward until it contacts the front end face 110, thereby achieving positioning of the sheet metal 1. In this embodiment, the straightness of the front end face 110 of the positioning plate 101 is less than or equal to 0.01 mm.

[0034] In the embodiments of this application, the parallelism between the V-groove 210, the V-protrusion 320, and the front end face 110 of the positioning plate 101 is good and all are less than or equal to 0.015 mm.

[0035] In this embodiment, the plate 1 is selected as a thin plate with a thickness of 0.8 mm, and the length of the plate 1 is selected as 1475.6 mm.

[0036] The punch 300 is limited by a limiting adjustment block. The V-groove 210 of the punch 300 and the die 200 are used to bend the inner bend angle 401 and the outer bend angle 402 respectively. The half-groove shell 400 has a height H and a width W along its length, which satisfy: H = 12.85mm~13.00mm, W = 30.3mm~30.6mm, the perpendicularity of the adjacent sides of the half-groove shell 400 is 0.1mm, the outer bend angle 402 and the inner bend angle 401 are both rounded, the rounded value of the outer bend angle 402 is less than or equal to R0.7, the rounded value of the inner bend angle 401 is less than or equal to R0.4, and no defects are shown by liquid penetration inspection of the inner bend angle 401 and the outer bend angle 402. The straightness of the half-groove shell 400 along its length is less than or equal to 0.5mm.

[0037] The bending forming device uses a bending method to bend sheet 1 into a semi-groove shell 400, which includes:

[0038] During assembly, first fully embed the die 200 into the bending machine tool, adjust it, and then lock the die 200.

[0039] Install two die-cutting molds onto the bending machine tool, fine-tune the straightness with bolts, and during assembly, the positioning attachment is fully embedded in the second groove 310. Adjust the bolts on the bending machine tool to make the straightness of the V-groove 210 less than or equal to 0.01mm, while ensuring that the center lines of the punch 300 and the die 200 are completely aligned. After adjustment, lock the bending die.

[0040] Install two positioning plates 101 onto the limit device of the bending machine tool, and make fine adjustments using bolts 102 to ensure that the straightness of the limit surface is less than or equal to 0.01mm. After adjustment, lock the positioning plates 101.

[0041] After the above steps and methods are completed, the installation and fixation of the punch 300 and die 200 and the limiting of the plate material are achieved, and subsequent adjustment work can be carried out.

[0042] Place the blank plate 1 flat on the die 200 and push it forward to the lower limit of the positioning plate 101. Press down the punch 300 to fold the outer bend angle 402. Adjust the position of the punch 300 and the limiting plate. Push the part forward to the upper limit of the positioning plate 101 and press down the punch 300 to fold the inner bend angle 401. Control the width W and height H of the folded half-groove shell 400 by adjusting the position of the positioning plate 101. Control the perpendicularity between the inner bend angle 401, the outer bend angle 402 and the adjacent sides of the half-groove shell 400 by adjusting the fillet value of the V-shaped protrusion 320 and the angle value of the V-shaped groove 210 of the punch 300.

[0043] In the above description of the bending method for bending sheet 1 into a semi-groove shell 400 using the bending forming device of this application, firstly, the die 200 is locked to the bending machine to achieve positioning of the die 200. Then, under the conditions of satisfying the straightness requirements of the V-groove 210 and the requirement that the center lines of the punch 300 and the die 200 coincide, the bending knife is assembled and positioned, and the positioning plate 101 is positioned and installed. Finally, during bending, the positioning plate 101, the punch 300, and the die 200 are linked to achieve bending of sheet 1 into a semi-groove shell 400, and the bending of the outward bending angle 402 and the inward bending angle 401 is completed, thereby achieving control over the width, height, and perpendicularity of the semi-groove shell 400. This achieves the purpose of bending and forming sheet 1. Thus, by using the bending forming device and the above bending method, the part dimensions and geometric tolerances of the semi-groove shell 400 can be met. The semi-groove shell 400 produced by the bending method of this application has good forming quality. The perpendicularity between the surfaces of the semi-groove shell 400, the inner bending angle and the outer bending angle meet high requirements. Compared with other bending processes, such as traditional stretch forming process, it is impossible to meet the above-mentioned process requirements of the semi-groove shell 400 of this application. The bending method of this application, which bends the sheet 1 into a semi-groove shell 400, is beneficial to improving the part accuracy of the semi-groove shell 400.

[0044] The bending forming apparatus provided in this application includes a positioning mechanism 100, a die 200, and a punch 300. The die 200 and punch 300 are arranged opposite each other. A V-groove 210 is formed on the side of the die 200 facing the punch 300, and a first groove 220 is formed on the side of the die 200 away from the punch 300. The first groove 220 is used to position and lock the die 200. A second groove 310 is formed on the side of the punch 300 away from the die 200, which is also used to position and lock the punch 300. A V-shaped protrusion 320 is formed on the side of the punch 300 closest to the die 200. The alignment of the 320 and V-groove 210 enables bending of the sheet metal 1. The positioning mechanism 100 includes a front end face 110, which faces the die 200 and the punch 300. The front end face 110 is used to push and position the sheet metal 1. Thus, this bending forming device, through the positioning mechanism 100, positions the sheet metal 1, and uses the punch 300 to achieve bending and limiting, thereby achieving the bending and forming of the semi-groove shell 400, meeting dimensional and tolerance requirements. When bending the sheet metal 1, the positioning mechanism 100, the punch 300, and the die 200 work together to control the width, height, and perpendicularity of the semi-groove shell 400. The bending forming device of this application is easy to operate, accurately positioned, and can effectively control the dimensions of the part, i.e., the semi-groove shell 400, ensuring the dimensional and geometric tolerances of the sheet metal 1 after bending to form the semi-groove shell 400. The bending forming device of this application is small in size, simple in structure, and has good manufacturability.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bending forming apparatus for forming a semi-groove shell (400), characterized in that, include: Positioning mechanism (100), opposing die (200) and punch (300); The die (200) has a V-groove (210) on the side facing the punch (300), and a first groove (220) is provided on the side of the die (200) away from the punch (300). The first groove (220) is used in conjunction with a precision bending machine tool. The punch (300) has a second groove (310) on the side away from the die (200), and the second groove (310) is connected to the precision bending machine tool; the punch (300) has a V-shaped protrusion (320) on the side close to the die (200); The positioning mechanism (100) includes a front end face (110) which is disposed facing the die (200) and the punch (300); The positioning mechanism includes two positioning plates (101), each positioning plate (101) having two steps for bending the inner bending angle (401) and outer bending angle (402) of the semi-groove shell (400) respectively, and the positioning plate (101) is used to assemble with the limiting position of the precision bending machine tool. The semi-groove shell (400) has an inner bend (401) and an outer bend (402), both of which include rounded corners. The rounded corner value of the inner bend (401) is less than or equal to R0.7, and the rounded corner value of the outer bend (402) is less than or equal to R0.

4. The straightness of the semi-groove shell (400) along its length is less than or equal to 0.5 mm, and the perpendicularity of the adjacent sides of the semi-groove shell (400) is 0.1 mm. The straightness of the V-groove (210) is less than or equal to 0.01 mm; The angle range of the V-groove (210) is 86° to 88°; The V-shaped protrusion (320) has a rounded corner (321) on the cross-section along the length direction of the punch (300), and the rounded corner (321) has a rounded corner value in the range of R0.2 to R0.3; The straightness of the front end face (110) is less than or equal to 0.01 mm; The parallelism between the V-groove (210), the V-protrusion (320), and the front end face (110) is less than or equal to 0.015 mm.

2. The bending forming apparatus according to claim 1, characterized in that, The die (200) is also provided with a relief groove (211), which is located at one end of the V-groove (210) away from the punch (300), and the relief groove (211) is connected to the V-groove (210).

3. The bending forming apparatus according to claim 1, characterized in that, The semi-groove shell (400) has a height H and a width W, satisfying: H = 12.85 mm ~ 13.00 mm, W = 30.3 mm ~ 30.6 mm.

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