Hot isostatic pressing anti-deformation device for small-size thin-wall titanium alloy casting

Abstract

The utility model discloses a small-size thin-wall titanium alloy casting hot isostatic pressing anti-deformation device which comprises a pouring gate used during casting pouring, a casting module formed by connecting a plurality of corresponding castings through a plurality of groups of inner sprues located above the pouring gate, a plurality of inner sprues located above the pouring gate, and a plurality of inner sprues located above the pouring gate and connected with the inner sprues before hot isostatic pressing. A plurality of thin-wall castings are spliced and welded on a pouring gate in sequence to form a casting module, the module is directly placed in a hot-pressing furnace during hot isostatic pressing, mutual extrusion during placement of the castings can be avoided, extrusion deformation during hot isostatic pressing of the castings is avoided, in addition, the casting module enters the furnace for hot isostatic pressing, batch charging or furnace matching of the castings can be achieved, and the production efficiency is improved. And the working efficiency can be obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to non ferrous metal investment casting technical field, concretely relates to a kind of small size thin-walled titanium alloy casting hot isostatic pressing anti-deformation device. BACKGROUND

[0002] With the rapid development of aviation, aerospace, weapons, ships and other fields, in order to reduce the weight of equipment, the demand for thin-walled titanium alloy structural parts is increasing. Titanium alloy structural parts forming methods include casting forming, machining, welding, etc. Among them, investment precision casting can form various complex shapes and structures, and has the advantages of high metal utilization rate, low cost, short cycle, etc. It is an ideal process for titanium alloy structural parts forming. Compared with cast steel, cast iron, cast aluminum, etc., titanium alloy has fast solidification speed and poor feeding effect during solidification, resulting in dispersed pores, shrinkage and other defects in the titanium alloy casting. These defects will affect the performance of the casting and become a hidden danger for casting failure. Hot isostatic pressing is a process in which metal parts are placed in a sealed and durable container, vacuumed and filled with inert gas, heated and pressurized, and the internal pores, shrinkage and shrinkage of the casting are creeped, compacted, combined and diffused into dense structures under high temperature and high pressure.

[0003] Hot isostatic pressing has become an important process for titanium alloy casting production in aviation and aerospace at home and abroad. After hot isostatic pressing, the casting can achieve 100% densification, improving the overall mechanical properties of the casting. To adapt to the lightweight design of equipment, aerospace precision castings are designed as thin-walled castings, with a wall thickness of usually ≤1mm. Typical components such as Figure 1 are shown. Such products usually have a size of ≤150mm and a thin wall thickness, and are produced in large quantities. During hot isostatic pressing of thin-walled castings, if the placement method is improper, the castings are easily squeezed and deformed. In order to avoid deformation of the castings, the castings need to be placed one by one, which seriously affects the work efficiency and increases the production cost. Improper placement can also cause deformation of the castings.

[0004] If the castings are deformed, in order to correct the deformed castings during post-processing, straightening is required. During straightening, mold design fees, mold material fees, mold processing fees, labor costs, straightening annealing furnaces, time and other costs such as manpower, material resources and time are generated. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model provides a kind of small size thin-walled titanium alloy casting hot isostatic pressing anti-deformation device, before hot isostatic pressing, multiple thin-walled castings are sequentially welded to the sprue to form a casting module, and the module is directly placed in the hot pressing furnace during hot isostatic pressing. It can avoid mutual squeezing of castings during placement, avoid squeezing and deformation of castings during hot isostatic pressing, and in addition, using casting module to enter the furnace for hot isostatic pressing can realize batch loading or matching of castings, which can significantly improve work efficiency.

[0006] The utility model discloses a small -size thin -walled titanium alloy casting hot isostatic pressing anti -deformation device, the device includes the runner that is used when casting, the upper interval of runner is provided with a plurality of castings, and a plurality of castings are connected with runner through inner gate respectively, and form casting module.

[0007] The utility model provides a small -size thin -walled titanium alloy casting hot isostatic pressing anti -deformation device, the device includes the runner that is used when casting, the upper interval of runner is provided with a plurality of castings, and a plurality of castings are connected with runner through inner gate respectively, and form casting module.

[0008] Further, the runner is horizontally arranged and has a T shape, and the overall length is 400-1000mm.

[0009] Further, the runner is made of titanium alloy material.

[0010] Further, the cross-sectional dimension of the runner is not less than 20mm*20mm.

[0011] Further, the castings are spot-welded and welded by a group of inner gates arranged on the side edges of the castings.

[0012] Further, the spacing between adjacent castings is 5-10mm.

[0013] Further, the inner gate has a cylindrical shape, and the height is not less than 10mm.

[0014] Further, a reinforcing rib for preventing deformation is arranged across the inner side of the casting.

[0015] The utility model has the advantages that:

[0016] (1) The device can avoid deformation of small-size thin-walled titanium alloy castings during hot isostatic pressing due to improper placement, and ensure the dimensional accuracy of the castings.

[0017] (2) The device can realize hot isostatic pressing operation of a large number of small-size thin-walled titanium alloy castings, reduce the workload of product loading, and improve labor efficiency.

[0018] (3) The device can realize free selection of furnace for hot isostatic pressing of small-size thin-walled titanium alloy castings, and also reduce the cost of hot pressing. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 a, 1b are structure schematic diagrams of typical titanium alloy thin-walled castings in the prior art.

[0020] Figure 2 It is a single casting inner gate schematic diagram of the utility model;

[0021] Figure 3 It is a whole casting module schematic diagram of the utility model;

[0022] Figure 4 This is a top view of the casting module of this utility model;

[0023] Attached reference numerals: 1. Sprue, 2. Ingate, 3. Casting, 4. Connecting rod. Detailed Implementation

[0024] A hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings, the device includes a gating system 1 used during casting, several castings 3 are arranged at intervals above the gating system 1, the spacing between adjacent castings 3 is 5-10mm, and a tie rod 4 for anti-deformation is arranged across the inner side of the castings. The several castings 3 are spot welded to the gating system 1 through an ingate 2 located on the side of the castings 3. The ingate 2 is cylindrical and its height is not less than 10mm.

[0025] The gating 1 is horizontally arranged and T-shaped, with an overall length of 400-1000mm. The gating 1 is made of titanium alloy and its cross-sectional dimensions are not less than 20mm*20mm.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] Example 1:

[0028] Taking a typical thin-walled titanium alloy casting as an example, in the investment casting process, the inner gate is as follows: Figure 2 As shown, the ingate 2 is cylindrical, and a tie rod 4 is provided across the inner side of the casting to prevent deformation and prevent the opening from opening. When cleaning and cutting the casting after pouring, the ingate 2 is retained with a residual height of not less than 10mm.

[0029] like Figure 3 As shown, several castings 3 located above the gating 1 are spot-welded to the gating 1 through a set of two inner gates 2 located on the sides of the castings 3 to form a module. The gating 1 is made of titanium alloy. The cross-sectional dimensions of the gating 1 are not less than 20mm*20mm. It is necessary to ensure that the gating can withstand a high temperature of about 940℃ during hot isostatic pressing without bending deformation. Depending on the number of products, the length of the gating can be selected from 400 to 1000mm. A support head is welded to one end of the horizontally set gating. The support head and the gating are set in a T-shape to prevent the module from tipping over.

[0030] The distance between the adjacent castings in the castings module is ensured to be 5-10mm, the castings module is directly put into a hot isostatic pressing furnace, can be placed horizontally or vertically into the furnace, the castings and the sprue 1 are separated after processing the castings and hot isostatic pressing, the hot isostatic pressing process is completed, the deformation of the small size thin-walled titanium alloy castings caused by improper placement during the hot isostatic pressing process can be avoided by using the device, the size precision of the castings is ensured, and the castings can be batched or matched for loading into the furnace, and the working efficiency can be significantly improved.

[0031] It should be noted that although the utility model has been described through the above embodiments, the utility model can also have other various embodiments. Those skilled in the art can obviously make various corresponding changes and modifications to the utility model without departing from the spirit and scope of the utility model, but these changes and modifications should all belong to the scope protected by the utility model claims and equivalents thereof.

Claims

1. A device for preventing deformation of small-sized thin-walled titanium alloy castings by hot isostatic pressing, characterized in that: The device includes a gating system (1) used for casting, and several castings (3) are arranged at intervals above the gating system (1). The several castings (3) are connected to the gating system (1) through an inner gate (2) to form a casting module.

2. The hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1, characterized in that: The gating channel (1) is set horizontally and is T-shaped, with an overall length of 400-1000mm.

3. A hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1 or 2, characterized in that: The gating system (1) is made of titanium alloy.

4. A hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1 or 2, characterized in that: The cross-sectional dimensions of the gating system (1) shall be no less than 20mm*20mm.

5. The hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1, characterized in that: The casting (3) is spot welded to the gating (1) through a set of ingates (2) located on the side of the casting (3).

6. A hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1 or 5, characterized in that: The spacing between adjacent castings (3) is 5-10 mm.

7. A hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1 or 5, characterized in that: The ingate (2) is cylindrical and its height is not less than 10 mm.

8. The hot isostatic pressing anti-deformation device for small-sized thin-walled titanium alloy castings according to claim 1, characterized in that: The casting has a tie rod (4) that is installed across the inner side to prevent deformation.

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