CN206169171U - A mould for metal founding - Google Patents

Abstract

The utility model discloses a mold for metal casting, which comprises a casting mold with an inner cavity, a gate, a runner connecting the inner cavity and the gate, and a heating device, which includes an induction coil and a power supply device thereof. The induction coil is arranged on the periphery of the casting mold. During the casting process of the mold, the heating device also works at the same time. When the heating device is working, the power supply device supplies power to the induction coil, and the induction coil can establish a magnetic field, so that the metal solution in the inner cavity of the mold generates an induced eddy current and generates heat, which can reach For the purpose of heating the metal material, the heating device only affects the metal in the inner cavity of the mould, and has no effect on the mould. The mold can heat the metal solution inside, so that the metal solution can be filled smoothly, and slag inclusions and air bubbles are discharged during filling, which improves the quality of castings.

Description

A mold for metal casting

technical field

The utility model relates to the technical field of casting, in particular to a mold for metal casting.

Background technique

Casting is a liquid metal forming technology. Specifically, casting is to smelt metal into a liquid that meets certain requirements and pour it into a casting mold. After cooling, solidification, and cleaning, castings with predetermined shapes, sizes, and properties are obtained. (part or blank) process.

The ambient atmosphere of metal smelting and the inner cavity material of the casting mold will make the molten metal contain metal compounds and other inclusions. The flow of the molten metal during pouring may entrain gas and cause pinholes in the casting, which will affect the quality of the casting.

However, with the development of society, in some industries, the requirements for castings are also constantly improving. Some require castings to be of higher quality and able to withstand a certain load, and also require high mechanical properties and high fatigue strength. . The internal quality of castings, including slag inclusions and pinholes, are closely related to these properties.

Therefore, how to improve the internal quality of castings and improve the performance of castings is a technical problem urgently needed to be solved by those skilled in the art.

Utility model content

The purpose of this utility model is to provide a mold for metal casting, which can heat the metal solution inside, so that the metal solution can be filled smoothly, and slag inclusions and air bubbles are discharged during filling, which improves the The quality of the casting.

In order to achieve the above technical purpose, the utility model provides a mold for metal casting, including a casting mold with an inner cavity, a gate, a runner connecting the inner cavity and the gate, and a heating device, The heating device includes an induction coil and its power supply device, and the induction coil is arranged on the periphery of the casting mold.

Optionally, the casting mold is a ceramic mold or a resin mold.

Optionally, induction coils are also provided around the gate and the runner.

Optionally, the casting mold further includes a core, and the core is further provided with a relief structure for shrinkage and/or draft relief of the core.

Optionally, the relief structure provided on the core is specifically a microcrack provided on the surface and/or inside of the core, the microcrack has a predetermined width, and the width can prevent the poured metal liquid from Surface tension enters the crack.

Optionally, the micro-cracks are arranged in the surface layer of the core facing the inner cavity.

Optionally, the casting mold is a ceramic mold; the core is a ceramic mold.

Optionally, the casting mold is a mold for casting a large propeller.

The mold for metal casting provided by the utility model includes a casting mold with an inner cavity, a gate, a runner connecting the inner cavity and the gate, and a heating device. The heating device includes an induction coil and a power supply device thereof, and the induction coil Set on the periphery of the casting mold.

During the casting process of the mold, the heating device also works at the same time. When the heating device is working, the power supply device supplies power to the induction collar, and the induction coil can establish a magnetic field, so that the metal solution in the inner cavity of the mold generates an induced eddy current and generates heat, which can reach For the purpose of heating the material, the heating device only affects the metal in the inner cavity of the mould, and has no effect on the mould. The mold can heat the metal solution inside, so that the metal solution can be filled smoothly, and slag inclusions and air bubbles are discharged during filling, which improves the quality of castings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model.

Fig. 1 is a side view of a specific embodiment of the internal stress unit provided by the utility model;

Wherein, the corresponding relationship between the reference numerals and component names in Fig. 1 is as follows:

The upper mold 101 of the casting mold; the lower mold 102 of the casting mold;

Gate 2; runner 3; induction coil 4; core 5.

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

Please refer to FIG. 1 , which is a side view of a specific embodiment of the internal stress unit provided by the present invention.

In a specific embodiment, the utility model provides a mold for metal casting, including a casting mold with an inner cavity, a gate 2, a runner 3 connecting the inner cavity and the gate 2, and a heating device , the heating device includes an induction coil 4 and its power supply device, and the induction coil 4 is arranged on the periphery of the casting mold.

In the process of using the mold for casting, the heating device also works at the same time. When the heating device is working, the power supply device supplies power to the induction collar 4, and the induction coil 4 can establish a magnetic field, so that the molten metal in the inner cavity of the mold generates an induced eddy current and generates heat. It can heat the metal solution. The heating device is an induction coil, which can only generate induction eddy current inside the metal and generate heat. It only heats the metal solution in the inner cavity and does not heat the mold itself.

The mold can heat the metal solution inside, so that the metal solution can be filled smoothly, and slag inclusions and air bubbles are discharged during filling, which improves the internal quality of the casting, enables the casting to withstand a certain load, and makes the casting have With high mechanical properties and high fatigue strength, it can process some parts with high requirements, which broadens the scope and industry of castings. For example, this mold can be used to manufacture large propellers, which can eliminate inclusions and pores inside the casting, and can ensure the mechanical properties and corrosion resistance fatigue strength of the propeller.

In addition, as shown in FIG. 1 , the casting mold includes an upper mold 101 and a lower mold 102 ; after the casting is completed, the upper mold 101 and the lower mold 102 can be opened to obtain a casting, without sand and shell cleaning. When the mold is used for casting, the steps of "sand cleaning" and "shell cleaning" can be omitted, and the casting can be obtained by directly opening the mold, and the mold can be reused.

In a further specific embodiment, the casting mold is a ceramic mold or a resin mold.

The heating device only heats metal materials. When the casting mold is made of non-metallic material, the casting mold itself will not be heated. Any non-metallic material that can be used as a mold can be used in this application, preferably ceramic material and resin material.

The mold made of ceramic material has high strength, high hardness, corrosion resistance, high temperature resistance, small deformation, good insulation, and has certain resistance to rapid cooling and rapid heating.

Resin material also has similar high hardness and corrosion resistance properties as ceramic material.

In a preferred implementation method, the periphery of the gate 2 and the runner 3 is also provided with an induction coil 4 .

During pouring, the molten metal can be heated not only in the inner cavity of the mold, but also when flowing through the runner 3 and the gate 2, so that the fluidity of the metal during the pouring process is better.

In addition, during the pouring process, metal solids can also be used, and the metal solids that meet the pouring conditions are placed in the gate 2, and the induction coil 4 around the gate 2 is energized to melt the solid metal. After the solid metal melts, it flows into the runner 3 And the inner cavity of the mold, the runner 3 and the induction coil 4 around the casting mold will continue to be heated, and the molten metal will not solidify when flowing in the runner 3 and the inner cavity of the casting mold, and the mold can be filled smoothly. During the filling process, slag and gas can be discharged, and high-quality castings can be obtained.

In each of the above-mentioned specific embodiments, the casting mold further includes a core 5, and a retreat structure for shrinking and retreating of the core 5 and/or retracting during drafting is also provided on the core 5.

The relief structure can provide a shrinkage relief space for the core 5 during the metal solidification process, or provide a relief space for easy drafting when the metal is solidified and molded, or both. For the former, the concession structure can be a shrinkage space provided on the core 5 during the metal solidification process, so that the core 5 as a whole produces the same or approximately the same volumetric shrinkage rate as the metal solidification during the metal solidification process. The core 5 will not be "locked", so that it is convenient to take the core 5 out of the casting under the action of an external force; The upper retreat cavity; when drawing the mold, the movable block retreats to the retreat cavity to release the shrinkage force applied to the core 5 during the metal solidification molding process.

In a preferred embodiment, the relief structure provided on the core 5 is specifically provided on the surface of the core 5 and/or inside the microcracks, the microcracks have a predetermined width, and the width can prevent the molten metal being poured under surface tension. into the crack under action.

The micro-cracks are formed on the voids on the core 5 that are not filled by the ceramic material, and the voids provide a redundant space for the ceramics to be squeezed and shrunk when they shrink. Microcracks can be formed in the core 5 as a whole, or only in the surface layer of the core facing the cavity of the mold. If the micro-cracks are formed in the surface layer, the maximum width of the micro-cracks needs to be sufficient to prevent the poured molten metal from entering the cracks under the action of its surface tension, so as to avoid the poured molten metal from flowing into the micro-cracks.

In a specific implementation manner, microcracks are arranged in the surface layer of the core 5 facing the inner cavity.

In another specific embodiment, the casting mold is a ceramic mold; the core 5 is a ceramic core.

For the case where the core 5 is made of ceramic or partially ceramic material, microcracks are formed in the ceramic part.

In a further specific embodiment, the casting mold and its core 5 are formed by ceramic powder and/or ceramic fiber.

The casting mold in the mold is formed by ceramic powder and/or ceramic fiber. The ceramic casting mold can be formed by using powder and binder, or can be formed by drawing zirconia into fiber, and by adjusting the internal composition and fiber of the binder The thickness can adjust the physical properties of ceramics such as elasticity and toughness. Therefore, ceramic casting molds can adjust their performance according to needs, with good applicability and a wide range of applications.

In each of the above specific embodiments, the casting mold is a mold for casting a large propeller.

The cavity of the casting mold defines the shape of the casting to be formed; the heating device includes an induction coil 4 and a power supply device for applying a voltage to the induction coil 4, the induction coil 4 is arranged on the periphery of the casting mold, and the heating device is only for the inner cavity of the casting mold The metal has an effect, but has no effect on the casting mold.

The mold can be used for the casting of large propellers, and the shrinkage of the propellers during casting is free-body contraction, and the shrinkage is not disturbed. The wheel hole of the propeller can adopt the core 5 provided with a concession structure, and the concession structure helps the shrinkage of the core 5 .

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (7)

1. a kind of mould for metal casting, including the casting die with inner chamber, cast gate（2）, connect the inner chamber and institute State cast gate（2）Running channel（3）, it is characterised in that also including heater, the heater includes induction coil（4）And its Electric supply installation, the induction coil（4）It is arranged on the periphery of casting die；

The cast gate（2）With the running channel（3）Periphery also be provided with induction coil（4）；

In casting process, metal solid is placed on cast gate（2）.

2. the as claimed in claim 1 mould for being used for metal casting, it is characterised in that the casting die be ceramic die or Resin die.

3. the mould of metal casting is used for as claimed in claim 1 or 2, it is characterised in that the casting die also includes type Core（5）, the core（5）On be additionally provided with for the core（5）Shrink the yielding structure that yielding and/or withdrawing pattern are made a concession.

4. the mould of metal casting is used for as claimed in claim 3, it is characterised in that the core（5）The yielding of upper setting Structure is specially and is arranged at the core（5）Surface and/or inside micro-crack, the micro-crack has predetermined width, The width can prevent to be cast molten metal under surface tension effects into the crackle.

5. the mould of metal casting is used for as claimed in claim 4, it is characterised in that the micro-crack is arranged at the core （5）The direction inner chamber side superficial layer in.

6. the mould of metal casting is used for as claimed in claim 5, it is characterised in that the casting die is ceramic die； The core（5）It is ceramic core.

7. the mould of metal casting is used for as claimed in claim 1 or 2, it is characterised in that the casting die is big for casting The mould of type propeller.