Cast steel mould with large radial size

Abstract

The utility model relates to a steel casting mold with a large radial size. A mold cavity of the steel ingot mold is designed into a mold cavity with the radial size larger than the height size, and the solidification sequence of molten steel is changed; the auxiliary heating equipment which is lifted and moved timely is used for locally heating molten steel which flows slowly and is low in liquid level, so that the flowability of the local molten steel is improved, and the liquid level of the molten steel uniformly rises. The method has the advantages of scientific and reasonable design, simple process, easiness in operation, low investment cost and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cast steel mould with large radial size, and particularly relates to a cast steel mould for reducing casting cold shrinkage defects, and belongs to the technical field of special steel casting. BACKGROUND

[0002] Alloy steel has superior properties such as high temperature resistance, wear resistance and corrosion resistance, and is widely used in the fields of aerospace, energy, mold and mechanical manufacturing. In order to obtain high-performance alloy steel billets, ingots and electroslag remelting processes are used for preparation, among which the steel billets produced by electroslag remelting process have the advantages of high purity and good microstructure, but the cost is increased by about 5000 yuan / ton compared with the ingot method, lacking market competitiveness; the ingot method has the advantages of simple process and equipment, but has more casting defects. Therefore, there is an urgent need for a new technology that can improve the porosity of the core of the large steel ingot and replace the electroslag remelting process. SUMMARY

[0003] The utility model provides a cast steel mould with large radial size, sets up the shape of the ingot mould inner cavity and the height-diameter ratio, optimizes the solidification sequence of molten steel, and reduces the casting defects of the core of the casting.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme implementation, a cast steel mould with large radial size, comprising: ingot mould, flow steel channel, the molten steel inlet of the ingot mould is arranged at the bottom, the flow steel channel is communicated with the mould cavity of the ingot mould through the molten steel inlet, characterized by:

[0005] The mould cavity of the ingot mould is arranged as a flat mould cavity with a radial size greater than a vertical size;

[0006] The heating device is arranged above the mold cavity and is composed of a vertical lifting rotating mechanism, a horizontal swinging mechanism, a heater, a temperature position sensor and a PLC controller.

[0007] The heater is an electric induction heater and is fixedly connected to the lower part of the horizontal moving table.

[0008] The temperature position sensor is arranged on the heater.

[0009] The PLC controller is electrically connected with the heater, the temperature position sensor, the first step motor, the second step motor and the third step motor.

[0010] Preferably, the vertical height and the radial width of the mold cavity are in a ratio of 1:1.2-3.

[0011] Preferably, the volume of the mold cavity is greater than or equal to 2.5 times the volume of the forged piece.

[0012] The mold cavity of the ingot mold is designed to have a radial size greater than a height size, the solidification sequence of the molten steel is changed, the local molten steel is locally heated by the auxiliary heating device which is timely lifted and moved, the flowability of the local molten steel is increased, and the molten steel liquid surface uniformly rises.

[0013] The utility model has the advantages of scientific and reasonable design, simple process, easy operation, low investment cost and the like. DRAWINGS

[0014] ATTACH Figure 1 The utility model is a structural schematic view.

[0015] In the drawing, 1 is a water inlet, 2 is a flow channel, 3 is a ingot mould, 4 is a vertical lifting rotating mechanism, 401 is a lifting platform, 402 is a vertical driving screw, 403 is a first step motor, 404 is a second step motor, 405 is a rotating rod, 5 is a horizontal swinging mechanism, 501 is a horizontal swinging platform, 502 is a horizontal driving screw, 503 is a third step motor, 504 is a swinging rod, 6 is a heater, 7 is a temperature position sensor, and a is a molten steel inlet. DETAILED DESCRIPTION

[0016] In the drawing, 1 is a water inlet, 2 is a flow channel, 3 is a ingot mould, 4 is a vertical lifting rotating mechanism, 401 is a lifting platform, 402 is a vertical driving screw, 403 is a first step motor, 404 is a second step motor, 405 is a rotating rod, 5 is a horizontal swinging mechanism, 501 is a horizontal swinging platform, 502 is a horizontal driving screw, 503 is a third step motor, 504 is a swinging rod, 6 is a heater, 7 is a temperature position sensor, and a is a molten steel inlet. Figure 1 As shown in the drawing, the molten steel enters the ingot mould 3 from the water inlet 1 through the flow channel 2 and the molten steel inlet a, spreads around the mould cavity in the ingot mould 3, and gradually solidifies. In the process of solidification, the uneven temperature drop causes uneven internal resistance during the flow of the molten steel. Therefore, the vertical lifting rotating mechanism 4 and the horizontal swinging mechanism 5 are added in this embodiment. During the solidification of the molten steel, the molten steel surface is heated to increase the flowability of the local molten steel, thereby realizing the uniform rising of the molten steel surface. The temperature position sensor 7 transmits the height and temperature information of the molten steel surface to the PLC (not shown in the drawing). The PLC instructs the first step motor 403, the second step motor 404 and the third step motor 503 to operate according to the set and measured temperature and height values, so that the heater 6 heats the molten steel to the appropriate temperature at the appropriate position. As shown in the drawing, the temperature position sensor 7 transmits the height information of the molten steel surface to the PLC, and the PLC instructs the first step motor 403 to drive the lifting platform 401 through the vertical driving screw 402, the second step motor 404 and the rotating rod 405 to move downward to the appropriate height. The PLC instructs the second step motor 403 to drive the horizontal swinging platform 501, the horizontal driving screw 502, the third step motor 503, the swinging rod 504 and the heater 6 to rotate horizontally, and at the same time, the PLC instructs the third step motor 503 to drive the heater 6 to move along the radial direction through the horizontal driving screw 502. After the heater 6 is sent to the position of the liquid surface to be heated through the vertical driving screw 402, the horizontal driving screw 502 and the rotating rod 405, the PLC instructs the heater 6 to heat the molten steel on the liquid surface according to the temperature information of the liquid surface measured by the temperature position sensor 7, so that the flowability of the molten steel at this position is increased, the molten steel surface rises uniformly, and a high-quality casting blank is obtained. Figure 1 As shown in the drawing, the temperature position sensor 7 transmits the height information of the molten steel surface to the PLC, and the PLC instructs the first step motor 403 to drive the lifting platform 401 through the vertical driving screw 402, the second step motor 404 and the rotating rod 405 to move downward to the appropriate height. The PLC instructs the second step motor 403 to drive the horizontal swinging platform 501, the horizontal driving screw 502, the third step motor 503, the swinging rod 504 and the heater 6 to rotate horizontally, and at the same time, the PLC instructs the third step motor 503 to drive the heater 6 to move along the radial direction through the horizontal driving screw 502. After the heater 6 is sent to the position of the liquid surface to be heated through the vertical driving screw 402, the horizontal driving screw 502 and the rotating rod 405, the PLC instructs the heater 6 to heat the molten steel on the liquid surface according to the temperature information of the liquid surface measured by the temperature position sensor 7, so that the flowability of the molten steel at this position is increased, the molten steel surface rises uniformly, and a high-quality casting blank is obtained.

Claims

1. A cast steel mold with a large radial dimension, comprising: The steel ingot mold, the steel flow channel, and the heating device are characterized in that: the molten steel inlet of the steel ingot mold is located at the bottom, and the steel flow channel is connected to the mold cavity of the steel ingot mold through the molten steel inlet; The mold cavity of the steel ingot mold is configured as a flat mold cavity with a radial dimension larger than its vertical dimension; The heating device is located above the mold cavity and consists of a vertical lifting and rotating mechanism, a horizontal swinging mechanism, a heater, a temperature position sensor, and a PLC controller. The vertical lifting and rotating mechanism includes a lifting platform, a vertical drive screw, a first stepper motor, a rotating rod, and a second stepper motor. The lifting platform and the vertical drive screw form a helical pair, with the vertical drive screw fixed. The first stepper motor is connected to the upper end of the vertical drive screw, driving the lifting platform to move up and down. The rotating rod is vertically connected to the lifting platform via bearings at both ends, with both ends extending outwards. The output shaft of the second stepper motor is connected to the upper end of the rotating rod. The described horizontal swing mechanism includes a swing rod, a horizontal moving platform, a horizontal drive screw, and a third stepper motor. One end of the swing rod is vertically fixed to the rotating rod at the bottom of the lifting platform. The horizontal moving platform and the horizontal drive screw form a helical pair. One end of the horizontal drive screw is movably connected to the bottom end of the rotating rod in the vertical lifting and rotating mechanism, and the other end is movably connected to one end of the swing rod, forming a horizontally suspended helical pair. The third stepper motor drives the horizontal drive screw to rotate, causing the horizontal moving platform to move radially. The second stepper motor drives the rotating rod to rotate in both directions around its axis, driving the horizontal moving platform to move in a circular motion around the axis of the rotating rod. The heater is an induction heater, which is fixedly connected to the lower part of the horizontal moving platform; The temperature position sensor is mounted on the heater; The PLC controller is electrically connected to the heater, temperature and position sensor, first stepper motor, second stepper motor, and third stepper motor.

2. The cast steel mold with a large radial dimension according to claim 1, characterized in that: The volume of the mold cavity is greater than or equal to 2.5 times the volume of the forging.

3. A cast steel mold with a large radial dimension according to claim 1 or 2, characterized in that: The ratio of the vertical height to the radial width of the mold cavity is 1:1.2 to 3.

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