Forming die for sheet metal spherical part

Abstract

The invention provides a forming die for a metal plate spherical part. The forming die comprises an upper die plate (2), an upper die (4), a blank holder (8), a lower die (13), a pressure relief device (17) and a lower die plate (26). The lower die (13) is a hollow cylinder, the bottom surface is connected with a lower template (26), and the side surface is provided with a pressure relief device (17); the blank holder (8) is annular and is connected to the top surface of the lower die (13); a part is clamped between the blank holder (8) and the lower die (13); a sealing cavity formed by the part, the lower die (13) and the lower die plate (26) is filled with a liquid medium; the forming surface of the upper die (4) is hemispherical, the upper die (4) is connected below the upper die plate (2), and the upper die plate (2) is connected to the hydraulic valve block; and the central axes of the upper die (4) and the lower die (13) coincide. The drawing pass is reduced, and the production efficiency is improved; the rejection rate is reduced and the economical efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of special process equipment, and in particular relates to a forming die for a sheet metal spherical part. Background Art

[0002] The fairing of a product of the company is a spherical part, which is used for pneumatic fairing of the product (such as Figure 2 The fairing part is a hemispherical shape.

[0003] When a conventional drawing die is installed on a press for deep drawing, a hemispherical punch and a movable arc-shaped die are used in combination, and multiple drawing passes are required. Since the edge of the product is in a suspended state before it is fully formed, wrinkles and cracks are easily generated, forming is difficult, and the scrap rate is high. Summary of the invention

[0004] The purpose of the present invention is to provide a forming die for sheet metal spherical parts, so as to realize smooth forming of a skin hemisphere, reduce the scrap rate, improve the drawing quality and improve the production efficiency.

[0005] The present invention provides a forming die for a sheet metal spherical part, comprising: an upper die plate 2, an upper die 4, a blank holder 8, a lower die 13, a pressure relief device 17, and a lower die plate 26;

[0006] The lower mold 13 is a hollow cylindrical shape, the bottom surface of which is connected to the lower mold plate 26, and a pressure relief device 17 is provided on the side;

[0007] The blank holder 8 is annular and connected to the top surface of the lower die 13;

[0008] The part is clamped between the blank holder 8 and the lower die 13; the sealed cavity formed by the part, the lower die 13 and the lower die plate 26 is filled with liquid medium;

[0009] The forming surface of the upper die 4 is hemispherical and is connected to the lower portion of the upper die plate 2 . The upper die plate 2 is connected to the hydraulic valve block. The central axes of the upper die 4 and the lower die 13 coincide with each other.

[0010] Optionally, the forming die for the sheet metal spherical part further includes: a sealing ring 14;

[0011] The sealing ring 14 is arranged on the top end surface of the lower mold 13 .

[0012] Optionally, the inner diameter of the blank holder 8 is consistent with the inner diameter of the lower die 13;

[0013] The difference between the diameter of the molding surface of the upper mold 4 and the inner diameter of the lower mold 13 is the thickness of the sheet metal spherical part.

[0014] Optionally, the upper end of the lower die 13 and the inner hole wall are rounded.

[0015] Optionally, the fillet radius is not less than 20 mm.

[0016] Optionally, the liquid medium is water or oil.

[0017] Optionally, the forming die for the sheet metal spherical part further includes: a drainage plug 21;

[0018] The lower template 26 is provided with a drainage hole, and the drainage plug 21 is threadedly connected in the drainage hole.

[0019] Optionally, the forming die for the sheet metal spherical part further includes: a lower sealing ring 23;

[0020] The lower sealing ring 23 is disposed between the lower mold 13 and the lower mold plate 26 .

[0021] Optionally, the forming die for the sheet metal spherical part further comprises: a stud 5, a nut 6 and a bracket 9;

[0022] The top outer ring of the lower mold 13 is provided with a bracket 9;

[0023] The outer ring of the pressure ring 8 is provided with a U-shaped groove;

[0024] One end of the stud 5 is hinged on the bracket 9, and the other end is sleeved with a nut 6 and inserted into the U-shaped groove, and the nut 6 is located above the pressure ring 8.

[0025] The present invention provides a forming die for sheet metal spherical parts, which has the following advantages: in addition to the downward forming force given by the upper die, under the action of the hydraulic pressure, the parts are promoted to automatically stick to the die, the material fluidity is increased, the forming is easy, and the risk of cracking and wrinkling of the parts is reduced. The area between the rounded corners of the lower die 13 and the parts is filled with liquid, which plays a lubricating role and reduces friction resistance. The parts are subjected to a normal outward force at the rounded corners of the lower die 13, which reduces the contact area between the part surface and the rounded corners of the lower die 13, reduces friction resistance and material surface damage, is easy to form, and reduces the risk of cracking and wrinkling of the parts. The number of drawing passes is reduced, and production efficiency is improved; the scrap rate is reduced, and the economy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of a forming die for a sheet metal spherical part;

[0028] Figure 2 It is a schematic diagram of parts;

[0029] Description of reference numerals:

[0030] The first lifting bolt 1, the upper template 2, the first hexagon socket screw 3, the upper mold 4, the bolt 5, the nut 6, the hexagon screw 7, the pressure ring 8, the bracket 9, the first cylindrical pin 10, the second cylindrical pin 11, the second hexagon socket screw 12, the lower mold 13, the upper sealing ring 14, the third cylindrical pin 15, the gasket 16, the pressure relief device 17, the sealing gasket 18, the spacer 19, the nut 20, the drain plug 21, the sealing gasket 22, the lower sealing ring 23, the second lifting bolt 24, the third hexagon socket screw 25, the lower template 26, and the fourth cylindrical pin 27. DETAILED DESCRIPTION

[0031] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. The following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the protection scope of the specific claims of the present invention.

[0032] The forming die of the sheet metal spherical part provided by the present invention is explained below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown, the forming die of the sheet metal spherical part provided by the present invention includes: a first lifting bolt 1, an upper template 2, a first hexagon socket screw 3, an upper mold 4, a bolt 5, a nut 6, a hexagon screw 7, a pressure ring 8, a bracket 9, a first cylindrical pin 10, a second cylindrical pin 11, a second hexagon socket screw 12, a lower mold 13, an upper sealing ring 14, a third cylindrical pin 15, a gasket 16, a pressure relief device 17, a sealing gasket 18, a cushion block 19, a nut 20, a drain plug 21, a sealing gasket 22, a lower sealing ring 23, a second lifting bolt 24, a third hexagon socket screw 25, a lower template 26, and a fourth cylindrical pin 27.

[0034] The part blank is installed between the blank holder 8 and the lower die 13, and the part blank is locked and pressed by the nut 6. When the upper die 4 moves downward, the part is slowly pressed against the die under the dual effect of the pressure generated by the liquid in the lower die 13, so as to realize the forming of the hemispherical part. The pressure relief device 17 ensures that the working pressure of the liquid in the cavity of the lower die 13 is 3.5MPa.

[0035] The first lifting bolt 1, the second lifting bolt 24 and the hexagonal screw 7 are standard parts, and they serve as lifting hanging points when the mold is disassembled and assembled.

[0036] The first hexagon socket screw 3, the second hexagon socket screw 12, and the third hexagon socket screw 25 are standard parts, which play the role of connecting and fastening various parts of the mold.

[0037] The first cylindrical pin 10, the second cylindrical pin 11, the third cylindrical pin 15 and the fourth cylindrical pin 27 are standard parts, which play a role in aligning and positioning when the mold is repaired.

[0038] The upper sealing ring 14 is an O-type fluorosilicone rubber sealing ring. When the O-type sealing ring is assembled, it is 5-7mm higher than the top surface of the lower mold 13, which is convenient for sealing. At the same time, a certain gap is created between the part and the top surface of the lower mold 13 to facilitate liquid filling therein, so that the part forms a suspended state with the end surface of the lower mold 13 during forming, thereby reducing friction resistance.

[0039] The bracket 9 is in the shape of a T-shaped fork ear, made of 45# steel, and subjected to quenching and tempering treatment, and plays the role of fixing the bolt 5.

[0040] The gasket 22 and the sealing gasket 18 are copper gaskets with a t1.5mm, which produce a sealing effect when compressed and deformed.

[0041] The gasket 16 is a standard part, which serves to increase the contact area between the nut 6 and the pressure ring 8 and reduce the compressive stress.

[0042] The cushion block 19 is in the shape of a circular tube, with one end being a flat surface and the other end being an arc surface, so as to fit with the arc surface of the inner cavity of the lower mold 13 to increase the contact area and enhance the stability.

[0043] Nut 6 and nut 20 are standard parts and play a role of thread connection.

[0044] The lower sealing ring 23 is of gasket type and made of fluorosilicone rubber. The outer hole size is 10 mm larger than the outer diameter size of the end face of the lower die 13 , and the inner hole size is 10 mm smaller than the inner diameter size of the end face of the lower die 13 .

[0045] The lower mold 13 and the lower mold plate 26 are designed separately, which improves the processing technology and reduces the manufacturing cost.

[0046] The lower die 13 is a hollow cylinder, made of ZG45, HRC40-45; the bottom surface is connected to the lower die plate 26, and a pressure relief device 17 is provided on the side; the bottom surface has an annular semicircular arc groove, which interlocks with the annular semicircular arc boss on the lower die plate 26 to increase the sealing effect.

[0047] The blank holder 8 is annular and connected to the top surface of the lower die 13; the finish of the contact surface between the blank holder 8 and the upper sealing ring 14 is not less than Ra0.4, which reduces scratches on the contact surface between the part and the blank holder 8 during forming and reduces the cause of part cracking.

[0048] The part is clamped between the blank holder 8 and the lower die 13; the sealed cavity formed by the part, the lower die 13 and the lower mold plate 26 is filled with liquid medium; under the action of the double force generated by the upper 4 and the liquid medium, the material is promoted to flow evenly and the wrinkling and cracking of the part are reduced.

[0049] The forming surface of the upper die 4 is hemispherical, and the material is 45# steel, HRC38-42; it is connected below the upper die plate 2, and the upper die plate 2 is connected to the hydraulic valve block; the central axes of the upper die 4 and the lower die 13 coincide.

[0050] Optionally, the forming die for the sheet metal spherical part further includes: a sealing ring 14;

[0051] The sealing ring 14 is arranged on the top end surface of the lower mold 13 .

[0052] Optionally, the inner diameter of the blank holder 8 is consistent with the inner diameter of the lower die 13;

[0053] The difference between the diameter of the molding surface of the upper mold 4 and the inner diameter of the lower mold 13 is the thickness of the sheet metal spherical part.

[0054] Optionally, the upper end of the lower die 13 and the inner hole wall are rounded.

[0055] Optionally, the fillet radius is not less than 20 mm.

[0056] Optionally, the liquid medium is water or oil.

[0057] Optionally, the forming die for the sheet metal spherical part further includes: a drainage plug 21;

[0058] The lower template 26 is provided with a drainage hole, and the drainage plug 21 is threadedly connected in the drainage hole.

[0059] Optionally, the forming die for the sheet metal spherical part further includes: a lower sealing ring 23;

[0060] The lower sealing ring 23 is disposed between the lower mold 13 and the lower mold plate 26 .

[0061] Optionally, the forming die for the sheet metal spherical part further comprises: a stud 5, a nut 6 and a bracket 9;

[0062] The top outer ring of the lower mold 13 is provided with a bracket 9;

[0063] The outer ring of the blank holding ring 8 is provided with a U-shaped groove;

[0064] One end of the stud 5 is hinged on the bracket 9, and the other end is sleeved with a nut 6 and inserted into the U-shaped groove, and the nut 6 is located above the pressure ring 8.

[0065] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A forming die for a sheet metal spherical part, characterized in that: include: An upper mold plate (2), an upper mold (4), a blank holder (8), a lower mold (13), a pressure relief device (17), and a lower mold plate (26); The lower mold (13) is in a hollow cylindrical shape, the bottom surface of which is connected to the lower mold plate (26), and a pressure relief device (17) is provided on the side surface; The blank holder (8) is annular and connected to the top surface of the lower die (13); The part is clamped between the blank holder (8) and the lower die (13); the sealed cavity formed by the part, the lower die (13) and the lower die plate (26) is filled with a liquid medium; The forming surface of the upper die (4) is hemispherical and connected to the lower side of the upper die (2). The upper die (2) is connected to the hydraulic valve block. The central axes of the upper die (4) and the lower die (13) coincide with each other.

2. The forming die for sheet metal spherical parts according to claim 1, characterized in that: Also includes: Sealing ring (14); The sealing ring (14) is arranged on the top end surface of the lower mold (13).

3. The forming die for sheet metal spherical parts according to claim 1, characterized in that: The inner diameter of the blank holder (8) is consistent with the inner diameter of the lower die (13); The difference between the diameter of the forming surface of the upper die (4) and the inner diameter of the lower die (13) is the thickness of the sheet metal spherical part.

4. The forming die for sheet metal spherical parts according to claim 1, characterized in that: The upper end of the lower die (13) and the inner hole wall are rounded.

5. The forming die for sheet metal spherical parts according to claim 4, characterized in that: The fillet radius shall not be less than 20mm.

6. The forming die for sheet metal spherical parts according to claim 1, characterized in that: The liquid medium is water or oil.

7. The forming die for sheet metal spherical parts according to claim 1, characterized in that: Also includes: Drainage plug (21); The lower template (26) is provided with a drainage hole, and the drainage plug (21) is threadedly connected in the drainage hole.

8. The forming die for sheet metal spherical parts according to claim 1, characterized in that: Also includes: Lower sealing ring (23); The lower sealing ring (23) is arranged between the lower mold (13) and the lower mold plate (26).

9. The forming die for sheet metal spherical parts according to claim 1, characterized in that: Also includes: stud (5), nut (6) and bracket (9); A bracket (9) is provided on the top outer ring of the lower mold (13); The outer ring of the blank holding ring (8) is provided with a U-shaped groove; One end of the stud (5) is hinged on the bracket (9), and the other end is sleeved with a nut (6) and inserted into the U-shaped groove, wherein the nut (6) is located above the pressure ring (8).

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