Forming tool and method for preparing rectangular hollow composite tubular member by using forming tool

A composite material and forming tooling technology, which is applied to tubular objects, applications, household appliances, etc., can solve problems such as uneven pressure, impact on forming quality, and difficulty in placing core molds, so as to avoid uneven expansion pressure and ensure molding quality. , the effect of shortening the preparation cycle

Active Publication Date: 2020-11-03
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patented method, two sets of molding tools need to be prepared, one for curing the product and one for the preparation of the silicone rubber mandrel. The molding quality of the silicone rubber mandrel is required to be high to ensure the molding quality of the product, and the production cost is invested in the early stage. Higher; in the process of thermal expansion of silicone rubber, the force on each part of the preform cannot be guaranteed to be uniform, and the molding quality of the product will be affected; in addition, the molding tooling of the product is split up and down, although the tooling structure is more Simple, but in the mold closing process, it is easy to cause problems such as extrusion of the preform and difficulty in placing the core mold, which is not conducive to ensuring the molding quality of the product
[0005] To this end, a large-size, rectangular hollow composite pipe forming tooling and preparation method is proposed to solve the problems of poor straightness, poor surface profile, uneven pressure, and additional preparation of mandrels in the prior art for composite pipes, and reduce the cost. Cost of production

Method used

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  • Forming tool and method for preparing rectangular hollow composite tubular member by using forming tool
  • Forming tool and method for preparing rectangular hollow composite tubular member by using forming tool
  • Forming tool and method for preparing rectangular hollow composite tubular member by using forming tool

Examples

Experimental program
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Effect test

preparation example Construction

[0084] In general, the preparation method provided by the invention comprises the following steps:

[0085](1) The present invention is a mandrel-free preparation process, which does not require the auxiliary preparation of cavity-type composite products such as silicone rubber mandrels, metal mandrels or foam mandrels, and does not require additional manufacturing of mandrel tooling to avoid the manufacture of mandrels The process not only reduces the cost of tooling and core mold manufacturing, but also has simple mold clamping and demoulding processes, without special equipment, shortening the product preparation cycle and improving production efficiency.

[0086] (2) The present invention transmits the molding pressure through the vacuum bag, which can ensure the uniform pressure transmission of the product during the molding process, ensure the molding quality of the product, and avoid the disadvantage of uneven expansion pressure caused by the expansion mandrel.

[0087]...

Embodiment 1

[0091] Component Product Name: Rectangular Hollow Composite Tube.

[0092] Product dimensions: length 7500mm, square section, side length 200mm.

[0093] The forming tooling is designed as:

[0094] The forming tooling includes a body and auxiliary parts;

[0095] The body includes a bottom plate, a left side baffle, a right side baffle and an upper baffle, and the four cooperate with each other to form a rectangular cavity. Both the left baffle and the right baffle are detachably connected to the bottom plate, and the upper baffle is detachably connected to the left baffle and the right side baffle. The upper ends of the left side baffle and the right side baffle are designed as corners extending inward, and the corner length is 30 mm (it should be noted that the meaning of the corner length here is the left side baffle and the right side The distance that the baffle extends inward, taking the left baffle as an example, this distance refers to the vertical distance from th...

Embodiment 2

[0114] The dimensions of the rectangular hollow composite material tube provided in Example 2 are the same as those in Example 1.

[0115] The design of the molding tool is basically the same as that of Example 1. In order to simplify the text, only the design of the molding tool of Example 2 that is different from that of Example 1 is described here:

[0116] The length of the upper corner of the left baffle and the right baffle are both 20mm, and the length of the lower corner is 110mm;

[0117] The top corners of the left side baffle and the right side baffle are designed to be beveled, and the angle of the bevel is 75°.

[0118] The molding method is the same as in Example 1, and will not be described in detail here.

[0119] The appearance quality of the final formed component is good, there is no delamination, debonding and other defects inside the non-destructive testing component, and the porosity is qualified, which ensures the appearance quality and internal quality...

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Abstract

The invention relates to a forming tool and a method for preparing a rectangular hollow composite tubular member by using the forming tool. The forming tool comprises a body and an auxiliary piece. The body comprises a bottom plate, a left side baffle, a right side baffle and an upper baffle which are matched with one another to form a rectangular cavity. The upper ends of the left side baffle andthe right side baffle are both designed to be in a corner form extending inwards. The left side baffle and the right side baffle are detachably connected with the bottom plate, and the upper baffle is detachably connected with the left side baffle and the right side baffle. The auxiliary piece comprises a left auxiliary stop block, a right auxiliary stop block and an auxiliary flat plate. The left auxiliary stop block and the right auxiliary stop block are detachably connected with the upper end of the left side baffle and the upper end of the right side baffle respectively. The auxiliary flat plate serves as an independent piece to be placed in the rectangular cavity, and when the auxiliary flat plate translates to the upper side, the left side and the right side of the auxiliary flat plate can be clamped by the corners of the left side baffle and the right side baffle, and the length of the auxiliary flat plate is not smaller than that of the bottom plate. By means of the forming tool, the high-quality rectangular hollow tubular member can be obtained.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a forming tool for forming a rectangular hollow composite tubular member and a method for preparing a rectangular hollow composite tubular member by using the forming tool. Background technique [0002] Advanced composite materials are widely used in the aerospace field due to their high specific strength, high specific modulus, high temperature resistance and corrosion resistance. Both military aircraft and civil aircraft use a large number of composite parts to achieve significant weight reduction. The amount of composite materials has become an important indicator to measure the advancement of aircraft. [0003] At present, for the preparation of large-size, rectangular hollow composite tubes, the molding methods are mainly divided into positive mold molding, silicone rubber expansion molding, water-soluble mandrel or low-temperature melting mandrel mold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/34B29C70/44B29C70/54B29L23/00
CPCB29C70/342B29C70/446B29C70/54B29L2023/22
Inventor 李阳张铁夫董大为王舸闫丽生
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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