A feeding process for gray iron flywheel structure

Abstract

The application provides a feeding process of a gray iron flywheel structure and belongs to the field of gray iron flywheel casting. The bottom surface of a sprue cup is connected with a vertical sprue, the two ends of the bottom of the vertical sprue are connected with horizontal sprues, a casting is installed on the horizontal sprues, a top cold riser is installed on the top of the casting, an internal cold riser is installed on the inner ring of the casting, and a local drop surface is arranged on the inner ring of the casting. The application solves the problem that the inner ring of the flywheel cannot sequentially solidify and shrinkage remains in the prior art, the top cold riser supplements liquid to the casting, the outer ring of the flywheel is fed, thereby reducing the insufficient casting and shrinkage deformation of the top of the flywheel, the internal cold riser design can specifically feed the inner ring of the flywheel, and the local drop surface enables the inner ring of the flywheel to sequentially solidify when solidifying. Through the above process, the inner ring of the flywheel is sequentially fed and solidified when self-solidifying, internal shrinkage remains are avoided, and it is ensured that the inner ring of the flywheel has no shrinkage remains.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gray iron flywheel casting, and particularly relates to a feeding process for a gray iron flywheel structure. BACKGROUND

[0002] It is known that the flywheel is a disc-shaped part with large moment of inertia. For a four-stroke engine, the work is done once in every four piston strokes, that is, only in the working stroke, while the exhaust, intake and compression strokes all consume work. Therefore, the torque output by the crankshaft to the outside is periodically changed, and the crankshaft speed is also unstable. In order to improve this situation, a flywheel is arranged at the rear end of the crankshaft. Its function is to store engine energy and overcome the resistance of other components to make the crankshaft rotate uniformly. The flywheel is an inertia wheel on the engine. The flywheel is a large disc-shaped part arranged at the rear end of the engine crankshaft. It has a large moment of inertia and is generally made of gray cast iron. However, the existing gray iron flywheel has the following problems during casting. The shrinkage tendency of gray iron material is low. After a certain feeding is added in the general process, there will be no shrinkage residual in the product. However, when the product itself interferes with shrinkage, it is difficult to feed by conventional process design. There is also shrinkage residual inside during self-solidification, which will affect the later processing and assembly. In view of the above defects, it is necessary to design a feeding process for a gray iron flywheel structure. SUMMARY

[0003] The present application aims to provide a feeding process for a gray iron flywheel structure, which has the characteristics of realizing sequential solidification of the inner ring of the flywheel and ensuring that there is no shrinkage residual in the inner ring, and solves the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a feeding process for a gray iron flywheel structure, comprising the following steps:

[0005] S1: mix gray iron into molten iron, and when the molten iron reaches the requirement, perform molten iron pouring, pour the molten iron into the vertical sprue through the sprue cup, the vertical sprue can change the flow direction of the molten iron, and the molten iron flows into the horizontal sprue through the vertical sprue.

[0006] S2: the molten iron flows smoothly into the cavity of the casting through the horizontal sprue, and the molten iron is shaped in the casting.

[0007] S3: supplement liquid to the casting through the top cold riser, increase the static pressure of the molten iron, and feed the outer ring of the flywheel.

[0008] S4: perform specific feeding on the inner ring of the flywheel through the internal cold riser, and realize sequential solidification of the inner ring of the flywheel through the local face lowering.

[0009] Preferably, the bottom surface of the sprue cup is connected with a vertical gate, the two ends of the bottom of the vertical gate are connected with horizontal gates, the castings are installed on the horizontal gates, the top cold riser is installed on the top of the castings, the internal cold riser is installed on the inner ring of the castings, and the local drop surface is arranged on the inner ring of the castings.

[0010] Preferably, the vertical gate is located on the bottom surface of the sprue cup, and the vertical gate extends vertically from the opposite direction of the bottom surface of the sprue cup, and the inside of the sprue cup is communicated with the inside of the vertical gate through the connecting part of the bottom surface.

[0011] Preferably, the horizontal gates extend horizontally and symmetrically to the two sides of the bottom of the vertical gate, and the inner gates are arranged above the two horizontal gates.

[0012] Preferably, the inside of the sprue cup is communicated with the inside of the vertical gate through the connecting part of the bottom.

[0013] Preferably, the castings are two and are symmetrically connected to the inner gates above the horizontal gates, the inside of the castings is provided with a cavity, and the cavity of the castings is communicated with the inner gates on the horizontal gates.

[0014] Preferably, the top cold riser and the internal cold riser are communicated with the cavity in the inside of the castings.

[0015] Preferably, the local drop surface is arranged at the position of the inner ring of the castings opposite to the internal cold riser.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] 1. The application provides a feeding process for a gray iron flywheel structure, a top cold riser is installed on the top of the castings, the top cold riser is used for feeding and feeding of the castings, liquid is supplied to the castings through the top cold riser, the volume of the molten iron is expanded by the top cold riser, the problems of shrinkage and shrinkage in the formed flywheel casting 4 are prevented, the setting of the top cold riser not only increases the static pressure of the molten iron, but also feeds the flywheel outer ring, thereby effectively reducing the occurrence of flywheel top casting deficiency and shrinkage deformation.

[0018] 2. The application provides a feeding process for a gray iron flywheel structure, an internal cold riser is installed on the inner ring of the castings, the internal cold riser is used for feeding and feeding of the inner ring of the castings, the design of the internal cold riser can be used for specific feeding of the flywheel inner ring, and the local drop surface is arranged on the corresponding position of the flywheel inner ring opposite to the internal cold riser, so that the flywheel inner ring realizes sequential solidification during solidification, through the above process, the flywheel inner ring is sequentially solidified during feeding and self-solidification, internal shrinkage is avoided, and no shrinkage is ensured in the flywheel inner ring. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a whole structure schematic diagram of the application;

[0020] Fig. 2 It is the whole structure of the present application front view schematic diagram;

[0021] Fig. 3 It is the whole structure of the present application back view schematic diagram.

[0022] In the figure: 1, the pouring cup; 2, the vertical gate; 3, the horizontal gate; 4, the casting; 5, the top cold riser; 6, the internal cold riser; 7, the local drop face. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] To solve the technical problem that the existing gray iron flywheel is difficult to perform feeding during casting, and there is shrinkage porosity remaining in the flywheel during self-solidification, thereby affecting the later processing and assembly of the flywheel, please refer to Figs. 1-3 The present application proposes the following technical solutions:

[0025] A feeding process of a gray iron flywheel structure, comprising the following steps:

[0026] S1: mix the gray iron into molten iron, and when the molten iron reaches the requirement, perform molten iron pouring, and pour the molten iron into the vertical gate 2 through the pouring cup 1, the vertical gate 2 can change the flow direction of the molten iron, and the molten iron flows into the horizontal gate 3 through the vertical gate 2.

[0027] S2: the molten iron flows smoothly into the cavity of the casting 4 through the horizontal gate 3, and the molten iron is shaped in the casting 4.

[0028] S3: supplement the liquid to the casting 4 through the top cold riser 5, increase the static pressure of the molten iron, and perform feeding to the outer ring of the flywheel.

[0029] S4: perform specific feeding to the inner ring of the flywheel through the internal cold riser 6, and realize the sequential solidification of the inner ring of the flywheel through the local drop face 7.

[0030] The bottom surface of the pouring cup 1 is connected with the vertical gate 2, both ends of the bottom of the vertical gate 2 are connected with the horizontal gate 3, the casting 4 is installed on the horizontal gate 3, the top cold riser 5 is installed on the top of the casting 4, the internal cold riser 6 is installed on the inner ring of the casting 4, and the local drop face 7 is arranged on the inner ring of the casting 4.

[0031] Specifically, the molten iron is injected into the sprue cup 1, and the molten iron first enters the inside of the vertical sprue 2 through the sprue cup 1, and then is transmitted to the inside of the horizontal sprue 3 under the action of the vertical sprue 2, and is branched to the inside of the two horizontal sprues 3 under the action of the vertical sprue 2, so that the molten iron is gathered in the horizontal sprue 3, and then flows into the inside of the casting 4 through the inner gate on the horizontal sprue 3, and the molten iron is shaped in the inside of the casting 4, thereby completing the casting of the gray iron flywheel, and after the molten iron is injected into the casting 4, liquid can be supplemented into the casting 4 through the top cold riser 5, the flywheel outer ring can be supplemented, and the increased internal cold riser 6 can be used for specific supplementing of the flywheel inner ring, and the flywheel inner ring can realize sequential solidification when solidifying through the local descending surface 7, and through the above process, the flywheel inner ring is supplemented and sequentially solidified when self-solidifying, so that internal shrinkage is avoided, and it is ensured that there is no shrinkage in the flywheel inner ring.

[0032] The vertical sprue 2 is located at the bottom surface of the sprue cup 1, and the vertical sprue 2 extends vertically from the opposite direction of the bottom surface of the sprue cup 1, and the sprue cup 1 is in communication with the inside of the vertical sprue 2 through the connecting part at the bottom surface.

[0033] It should be noted that the molten iron mixed by the gray iron is injected into the vertical sprue 2 through the sprue cup 1, and the molten iron can be transmitted to the horizontal sprue 3 through the vertical sprue 2, and the vertical extension of the vertical sprue 2 can make the metal liquid flow faster, thereby increasing the pouring speed.

[0034] The horizontal sprue 3 extends horizontally and symmetrically to both sides from the bottom of the vertical sprue 2, and the inner gate is arranged above the two horizontal sprues 3.

[0035] It should be noted that the horizontal sprue 3 plays a role in transmitting the metal liquid, and the horizontal sprue 3 transmits the metal liquid in the vertical sprue 2 to the inside of the casting 4.

[0036] The vertical sprue 2 is in communication with the inside of the horizontal sprue 3 through the connecting part at the bottom.

[0037] It should be noted that the vertical sprue 2 is directly connected with the horizontal sprue 3, the water flow is smooth, the casting 4 can be quickly filled, and the pouring efficiency is improved.

[0038] The casting 4 is provided with two and is symmetrically connected to the inner gate above the horizontal sprue 3, the inside of the casting 4 is provided with a cavity, and the cavity of the casting 4 is in communication with the inner gate on the horizontal sprue 3.

[0039] It should be noted that the casting 4 is provided with two and is symmetrically arranged on the horizontal sprue 3, the metal liquid uses the inner gate on the horizontal sprue 3 for pouring, and two gray iron flywheel parts can be formed at one time, thereby improving the production efficiency.

[0040] The top cold riser 5 and the internal cold riser 6 are in communication with the cavity in the inside of the casting 4.

[0041] Specifically, the top cold riser 5 is located at the top of the casting 4, and the top cold riser 5 is used for filling and feeding of the casting 4 by top pouring. The volume of molten iron is expanded by the top cold riser 5, which can not only increase the static pressure of the molten iron, but also timely feed the liquid shrinkage and solidification shrinkage of the molten iron during the forming of the casting 4, so as to prevent the problems of shrinkage cavity and shrinkage porosity of the formed flywheel casting 4, thereby reducing the flywheel top casting deficiency and shrinkage deformation, improving the quality of the flywheel casting 4, and the internal cold riser 6 is located on the inner ring of the casting 4. The internal cold riser 6 is used for filling and feeding of the inner ring of the casting 4, and the inner ring of the flywheel is specifically fed by the internal cold riser 6, which can effectively avoid the problem of shrinkage porosity of the flywheel inner ring. Through the setting of the top cold riser 5 and the internal cold riser 6, the feeding area can be increased, and the effect of uniform feeding can be better achieved, so as to ensure the uniformity of the casting 4 and meet the dynamic balance requirement.

[0042] The local reduction surface 7 is arranged at the position of the inner ring of the casting 4 opposite to the internal cold riser 6.

[0043] It should be noted that the local reduction surface 7 is arranged on the corresponding position of the flywheel inner ring opposite to the internal cold riser 6, so that the flywheel inner ring can realize sequential solidification during solidification, and the problem of shrinkage porosity residual in the internal ring is avoided, thereby ensuring that the flywheel inner ring has no shrinkage porosity residual.

[0044] Working principle: During pouring, the molten iron is poured into the vertical runner 2 through the sprue cup 1, and under the action of the vertical runner 2, the molten iron flows along the vertical runner 2 to the horizontal runner 3, and then the molten iron is transmitted to the inside of the casting 4 through the horizontal runner 3, so that the molten iron is formed in the inside of the casting 4. During the forming process, the volume of the molten iron is expanded by the top cold riser 5, which can not only increase the static pressure of the molten iron, but also timely feed the liquid shrinkage and solidification shrinkage of the molten iron during the forming of the casting 4, so as to prevent the problems of shrinkage cavity and shrinkage porosity of the formed flywheel casting 4, thereby reducing the flywheel top casting deficiency and shrinkage deformation, improving the quality of the flywheel casting 4, and the inner ring of the flywheel is specifically fed by the internal cold riser 6, which can effectively avoid the problem of shrinkage porosity of the flywheel inner ring. Through the setting of the top cold riser 5 and the internal cold riser 6, the feeding area can be increased, and the effect of uniform feeding can be better achieved, so as to ensure the uniformity of the casting 4 and meet the dynamic balance requirement. At the same time, the local reduction surface 7 is arranged on the corresponding position of the flywheel inner ring opposite to the internal cold riser 6, so that the flywheel inner ring can realize sequential solidification during solidification, and the problem of shrinkage porosity residual in the internal ring is avoided, thereby ensuring that the flywheel inner ring has no shrinkage porosity residual. Through the above process, the flywheel inner ring can be sequentially fed and solidified during self-solidification, and the flywheel inner ring has no shrinkage porosity residual.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0046] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, and it is intended that the scope of the application be limited solely by the scope of the appended claims and the equivalents thereof.

Claims

1. A feeding process for a grey iron flywheel structure, characterized in that: The following steps are involved: S1: Mixing gray iron into molten iron. When the molten iron reaches the required level, pouring the molten iron is performed. The molten iron is poured into the vertical pouring channel (2) through the pouring cup (1). The vertical pouring channel (2) can change the flow direction of the molten iron. The molten iron flows into the horizontal pouring channel (3) through the vertical pouring channel (2); S2: The molten iron flows smoothly into the mold cavity of the casting (4) through the runner (3), and the molten iron is formed in the casting (4); S3: Add liquid to the casting (4) through the top cold riser (5) to increase the static pressure of the molten iron and feed the outer ring of the flywheel; S4: Feed the flywheel inner ring through the internal cold riser (6), and simultaneously realize the sequential solidification of the flywheel inner ring through the local surface reduction (7); The bottom surface of the pouring cup (1) is connected to a vertical runner (2), both ends of the bottom of the vertical runner (2) are connected to horizontal runners (3), the casting (4) is mounted on the horizontal runner (3), the top cold riser (5) is mounted on the top of the casting (4), the internal cold riser (6) is mounted on the inner ring of the casting (4), and the local drop surface (7) is set on the inner ring of the casting (4); The local step-down surface (7) is arranged on an inner ring position of the casting (4) opposite to the internal cold riser (6).

2. A feeding process for a gray iron flywheel structure according to claim 1, characterized in that: The vertical pouring channel (2) is located on the bottom surface of the pouring cup (1), and the vertical pouring channel (2) extends vertically in the opposite direction of the bottom surface of the pouring cup (1). The pouring cup (1) is connected to the interior of the vertical pouring channel (2) through a connection at the bottom surface.

3. The feeding process for a gray iron flywheel structure according to claim 1, characterized in that: The horizontal runner (3) extends horizontally and symmetrically from the bottom of the vertical runner (2) to both sides, and an inner gate is provided above the horizontal runners (3) on both sides.

4. The feeding process for a gray iron flywheel structure according to claim 1, characterized in that: The vertical runner (2) is connected to the interior of the horizontal runner (3) through a connection at the bottom.

5. The feeding process for a gray iron flywheel structure according to claim 1, characterized in that: The casting (4) is provided with two endogates symmetrically connected to the endogate above the runner (3); a cavity is provided inside the casting (4); the cavity of the casting (4) is communicated with the endogate on the runner (3).

6. The feeding process for a gray iron flywheel structure according to claim 1, characterized in that: The top cold riser (5) and the internal cold riser (6) are both in communication with the cavity inside the casting (4).

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