Graphite model capable of being directly preheated

Abstract

According to the graphite model capable of being directly preheated, a plurality of grooves are formed in the surface of the graphite model, an electric heating wire is embedded in each groove, and the electric heating wires are wound on the periphery of the graphite model after being connected with one another. According to the utility model, the electric heating wire is embedded on the surface of the graphite model, so that the graphite model is directly and quickly heated to a required temperature in a vacuum furnace, the defects of poor filling type, poor feeding performance and insufficient pouring are overcome, and the quality of titanium and titanium alloy castings is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to graphite model heating technical field, especially relate to a graphite model that can directly preheat. BACKGROUND

[0002] Graphite material has high thermal chemical stability and refractoriness (only has weak reaction with titanium liquid), high strength (strength increases with temperature rise), low thermal expansion coefficient and good wettability, and is widely used in the casting of titanium and titanium alloy. However, graphite material has excellent properties, but also has properties that are not conducive to the casting and casting of titanium and titanium alloy, such as easy oxidation in air, strong adsorption of gas, high thermal conductivity of refractory material, etc., which affect the quality of the casting, such as poor filling type, poor feeding performance, and easy pouring shortage. In order to minimize the influence of these factors, the prior art generally preheats the graphite model, generally heats in a non-vacuum resistance furnace (about 350 DEG C) and then quickly transfers to a vacuum condensate furnace for pouring. This preheating process has certain improvement effect on the casting quality, but due to large workload, low heating efficiency and high safety risk, it seriously affects the production and quality of titanium and titanium alloy castings. Especially with the lightweight trend of casting design, the wall thickness of the casting is continuously thinned and the area is continuously increased, and the above preheating method cannot meet the quality requirements of the casting. SUMMARY

[0003] The utility model provides a graphite model that can be directly preheated to overcome the deficiencies of the prior art.

[0004] The utility model adopts the technical scheme of a graphite model that can be directly preheated, the surface of the graphite model has a plurality of grooves, each groove is embedded with an electric heating wire, and the electric heating wires are connected with each other and wound around the periphery of the graphite model.

[0005] The electric heating wires are fixed in the grooves by a plurality of fixed clamps.

[0006] The graphite model is provided with a blind hole on the outer wall, and a temperature sensor is inserted into the blind hole.

[0007] The grooves are distributed in a serpentine shape.

[0008] The grooves are distributed in a spiral shape.

[0009] Compared with the prior art, the utility model has the beneficial effects of:

[0010] 1、The utility model embeds electric heating wires on the surface of the graphite model, realizes direct rapid heating of the graphite model to the required temperature in the vacuum furnace, overcomes the poor filling type, poor feeding performance and pouring shortage, and guarantees the quality of titanium and titanium alloy castings.

[0011] 2. This utility model completes the preheating and casting of the graphite model in a vacuum furnace in sequence, which not only reduces labor intensity and safety risks, but also improves production efficiency and reduces production costs.

[0012] 3. This utility model avoids the temperature drop during the transfer process after preheating the graphite model in the prior art, and is particularly suitable for the production needs of thin-walled castings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model. Detailed Implementation

[0015] The following is in conjunction with the appendix Figures 1-2 The present invention will be described in detail with reference to specific embodiments.

[0016] This invention involves setting several grooves 1-1 on the surface of a graphite model 1, embedding a heating wire 2 in each groove 1-1, and connecting the heating wires 2 together to wind around the periphery of the graphite model 1. Specifically, during embedding, the heating wires 2 are fixed in the grooves 1-1 by fixing clips.

[0017] In order to accurately obtain the temperature of the graphite model 1, a blind hole 1-2 is provided on the outer wall of the graphite model 1, and a temperature sensor 3 is inserted in the blind hole 1-2 to accurately measure the temperature rise of the graphite model.

[0018] The number and distribution of grooves 1-1 need to be determined based on the structural characteristics of the graphite model 1 itself. This application provides the following two specific implementation structures:

[0019] Example 1: See Figure 1 The grooves 1-1 are set in three groups, and each group is distributed in a serpentine pattern. A heating wire 2 is laid in the serpentine grooves in sequence and continuously.

[0020] Example 2: See Figure 2 The grooves 1-1 are a group and are spirally distributed, and a heating wire 2 is continuously laid in the spirally distributed grooves.

[0021] In the above embodiments, the grooves 1-1 are all machined.

[0022] In practical use, place this utility model directly on the furnace plate inside the vacuum furnace, then connect the heating wire 2 to the power supply, turn off the vacuum furnace, evacuate the vacuum, and power the heating wire 2 to quickly heat the graphite model. The temperature of the graphite model is fed back by the temperature sensor 3. When the temperature reaches (about 350℃), turn off the heating power of the heating wire 2 and directly carry out the casting operation in the vacuum furnace.

[0023] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent variations made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A graphite model that can be directly preheated, characterized in that: The surface of the graphite model (1) has several grooves (1-1), each groove (1-1) is fitted with a heating wire (2), and the heating wires (2) are connected to each other and wrapped around the periphery of the graphite model (1).

2. The graphite model that can be directly preheated according to claim 1, characterized in that: The heating wire (2) is fixed in the groove (1-1) by several fixing clips.

3. The graphite model that can be directly preheated according to claim 1, characterized in that: The graphite model (1) has blind holes (1-2) on its outer wall, and a temperature sensor (3) is inserted into the blind holes (1-2).

4. The graphite model capable of direct preheating according to claim 1, 2, or 3, characterized in that: The grooves (1-1) are distributed in a serpentine pattern.

5. The graphite model capable of direct preheating according to claim 1, 2, or 3, characterized in that: The grooves (1-1) are spirally distributed.

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