CN110666044A

CN110666044A - Storage tank bottom convex hole die

Info

Publication number: CN110666044A
Application number: CN201911144895.5A
Authority: CN
Inventors: 陶明清; 王春林; 许璐迪; 洪跃忠; 罗成; 李军
Original assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Current assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-01-10
Anticipated expiration: 2039-11-20
Also published as: CN110666044B

Abstract

The invention discloses a convex hole die at the bottom of a storage box, which comprises a convex die and a concave die which are correspondingly arranged, wherein the convex die comprises a base and a lower die holder which are connected through a mandril, the lower part of the base is provided with a hoisting shaft, the upper part of the lower die holder is provided with the convex die and a guide pillar, the convex die is fixedly connected with a lower transverse seat through a convex die fixing plate, a base plate is arranged between the convex die and the lower die holder, a screw and a positioning pin are arranged between the convex die fixing plate and the lower transverse seat, a screw and a pin are arranged between the guide pillar and the lower die holder, the upper part of the lower die holder is also provided; the female die is matched with the pressing male die, and the mounting hole is matched with the male die and the guide pillar. The mould can ensure the stable and reliable manufacturing quality of products and can meet the use requirement of the storage box of the aerospace vehicle.

Description

Storage tank bottom convex hole die

Technical Field

The invention relates to a convex hole die for the bottom of a storage box, in particular to a die for forming a flanging hole in the convex hole on the bottom of a large storage box by using a steel die.

Background

The storage tank of the aerospace vehicle is formed by processing multi-purpose aluminum alloy plates, and various flanging holes are required to be processed at the bottom of the storage tank for welding various pipeline conduits. The diameter of the bottom of the storage box is large, and the bottom of the storage box is formed by welding a plurality of parts. The flanging hole on the bottom of the storage box can only be formed into a single flanging hole on a single part by means of a tool before tailor-welding, and then the flanging hole is combined and tailor-welded into the bottom of the storage box. Although the original convex hole forming flanging hole is simple in process, and the tool required by operation is miniaturized and simplified, the relative position deviation among the flanging holes is large after the flanging holes are combined and welded into the bottom of the storage box, and the rejection rate is high due to the fact that the size precision is difficult to meet the requirement.

In recent years, new methods for forming the bottom of the storage tank are being developed successfully, such as a stretching forming method and a spinning forming method for the bottom of the storage tank, and a flanging hole for forming a convex hole on the bottom of the storage tank which is welded in a combined and spliced mode is receiving more and more attention. During the forming process of the bottom of the storage tank, the deformation of the plate is large, the plate generates a work hardening phenomenon, the strength is improved, the plasticity is reduced, and meanwhile, a plurality of dislocations and microcracks exist inside crystal grains, so that the flanging hole is formed by the convex hole on the bottom of the storage tank, the difficulty is very high, and the breakage rate of the convex hole reaches more than 80%.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for forming a convex hole in the bottom of a storage box.

In order to achieve the purpose, the invention adopts the following technical scheme:

a storage box bottom convex hole die comprises an upper die and a lower die which are arranged correspondingly, wherein the lower die comprises a base and a lower transverse seat which are connected through a mandril, the lower part of the base is provided with a lifting shaft, the upper part of the lower transverse seat is provided with a male die and a guide pillar, the male die is fixedly connected with the lower transverse seat through a male die fixing plate, a base plate is arranged between the male die and the lower transverse seat, a screw and a positioning pin are arranged between the male die fixing plate and the lower transverse seat, a screw and a pin are arranged between the guide pillar and the lower transverse seat, the upper part of the lower transverse seat is also provided with a material pressing male die, and the material; the upper die comprises a female die and a mounting hole, the female die is matched with the pressing male die, and the mounting hole is matched with the male die and the guide pillar.

The male die is used for flanging the initial hole of the blank. The female die is used for completing flanging and forming of the blank together with the male die. The function of the guide post: firstly, guiding and correcting. And secondly, the male die and the female die have consistent die gaps, and the flanging forming of the hole on the blank is ensured. The pressing male die is used for pressing the blank part on the molded surface of the female die.

Further preferably, the male die is provided in plurality.

Further preferably, the lower transverse seat is connected with the punch fixing plate through a positioning pin.

Further preferably, a bushing is arranged between the mounting hole and the guide post.

The upper die and the lower die of the die press and compact the bottom of the storage box during the convex hole. The flanging die is arranged in the hydraulic forming press, and the pressure of the hydraulic forming press to the flanging die is 100 plus 500T.

The flanging die is used for forming the multiple-pass convex holes at the bottom of the storage box, and the two convex dies of the flanging die move upwards gradually at the same time, so that the two flanging holes are formed gradually in 3-8 passes.

4 positioning pins are arranged on the lower die of the flanging die, the formed flanging holes need to be corrected and polished between multi-pass flanging forming, vaseline lubricating paste is supplemented as required, and the friction force of the flanging holes is reduced.

The inner diameter phi of a flanging hole formed by the convex hole is 40-120 mm, the height of the flanging is 10-20 mm, the flanging hole is in a crooked neck shape, and the two flanging holes are symmetrically distributed.

The invention has the following advantages:

the mold can greatly improve the success rate of the convex holes, the breakage rate of the convex holes is reduced from 80 percent to 10 percent, the relative position precision of a plurality of flanging holes is very high, 100 percent of flanging holes can meet the requirement, and compared with the mode that the single convex hole is welded before splicing, the bottom of the storage tank is formed by splicing, the mold has great advancement and innovation, and remarkable beneficial effects are obtained.

Drawings

FIG. 1 is a schematic view of the structure of the flanging die of the invention.

Wherein: 1 is a hoisting shaft, 2 is a mandril, 3 is a cushion plate, 4 is a punch fixing plate, 5 is a punch, 6 is a bush, 7 is a key, 9 is a die, 10 is a guide post, 11 is a pressing punch, 12 is a lower transverse seat, 13-16 are screws, and 17-20 are pins.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

the bottom of the storage box is made of 2212 aluminum alloy plate, the diameter of the opening at the bottom is 2000mm, the height is 600mm, and the wall thickness is 6 mm. The diameter of the primary hole machined is phi 45mm, the distance from the center of the primary hole to the central axis of the bottom of the box is 500mm, the primary hole is ground and polished after machining, vaseline lubricating paste is coated, and the friction force of the convex hole is reduced. And then the bottom of the storage box is arranged between an upper die and a lower die of the flanging die, and is compressed and compacted. The pressure of the hydraulic forming press on the flanging die is 100T, 5-pass convex hole forming is carried out, two guide columns of the flanging die move upwards gradually at the same time, and two flanging holes are formed step by step in multiple passes. The convex hole is successfully formed into the flanging hole finally, no crack is formed at the flanging position, the inner diameter phi of the formed flanging hole is 60mm, and the height of the flanging is 15 mm. Slicing and detecting the flanging holes, wherein the flanging holes are in a crooked neck shape, and the two flanging holes are symmetrically distributed. The thickness of the flanging area is measured, the thickness dimension is shown in table 1, the thinning amount of the side A of the flanging area is large and is 4.1mm at least, and the use requirement is met.

TABLE 1 thickness measuring instrument for flanging hole at bottom of storage box

Example 2:

the bottom of the storage box is made of 2214 aluminum alloy plate, the diameter of the opening part at the bottom is 2800mm, the height is 800mm, and the wall thickness is 9 mm. The diameter of the primary hole machined is phi 65mm, the distance from the center of the primary hole to the central axis of the box bottom is 700mm, the primary hole is ground and polished after machining, vaseline lubricating paste is coated, and the friction force of the convex hole is reduced. Then the box bottom is arranged between the upper die and the lower die of the flanging die and is compressed and compacted. The pressure of the hydraulic forming press on the flanging die is 300T, the flanging die is subjected to 6-pass convex hole forming, and the two guide pillars of the flanging die move upwards gradually at the same time, so that two flanging holes are formed step by step in multiple passes. The convex hole is successfully formed into the flanging hole finally, no crack is formed at the flanging position, the inner diameter phi of the formed flanging hole is 80mm, and the height of the flanging is 20 mm. Slicing and detecting the flanging holes, wherein the flanging holes are in a crooked neck shape, and the two flanging holes are symmetrically distributed. The thickness of the flanging area is measured, the thickness dimension is shown in table 2, the thinning amount of the side A of the flanging area is large and is 5.6mm at least, and the use requirement is met.

TABLE 2 thickness measuring instrument for flanging hole at bottom of storage box

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides a bottom of case bulge hole mould of storage tank which characterized in that: the device comprises an upper die and a lower die which are correspondingly arranged, wherein the lower die comprises a base and a lower transverse seat which are connected through an ejector rod, a hoisting shaft is arranged at the lower part of the base, a male die and a guide pillar are arranged at the upper part of the lower transverse seat, the male die is fixedly connected with the lower transverse seat through a male die fixing plate, a base plate is arranged between the male die and the lower transverse seat, a screw and a positioning pin are arranged between the male die fixing plate and the lower transverse seat, a screw and a pin are arranged between the guide pillar and the lower transverse seat, a material pressing male die is also arranged at the upper part of the lower transverse; the upper die comprises a female die and a mounting hole, the female die is matched with the pressing male die, and the mounting hole is matched with the male die and the guide pillar.

2. The mold for the bottom lug hole of the storage box according to claim 1, wherein: the number of the male dies is multiple.

3. The mold for the bottom lug hole of the storage box according to claim 1, wherein: the lower transverse seat is connected with the male die fixing plate through a positioning pin.

4. The mold for the bottom lug hole of the storage box according to claim 1, wherein: and a bushing is arranged between the mounting hole and the guide pillar.