CN101966560A

CN101966560A - Bottom casting system of strip sectional inner runners

Info

Publication number: CN101966560A
Application number: CN 201010285094
Authority: CN
Inventors: 邓小明
Original assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Priority date: 2010-09-15
Filing date: 2010-09-15
Publication date: 2011-02-09
Anticipated expiration: 2030-09-15
Also published as: CN101966560B

Abstract

The invention discloses a bottom casting system of strip sectional inner runners, and belongs to the technical field of casting. The conventional casting system causes high sand-iron ratio, shrinkage cavity and shrinkage porosity defects and casting scraps by using a ceramic pipe as an inner runner. The system comprises a straight runner, a transverse runner, at least two inner runners and a die cavity which are communicated, wherein the transverse runner and the inner runners are positioned below the die cavity; and the inner runners are vertical and communicated with the transverse runner from the bottom of the die cavity. The system is characterized in that: the inner runners have strip cross sections formed by casting sand. The inner runners have strip sections so that the section area of the inner runners can be enlarged and the casting speed of large castings is ensured; the inner runners are made of casting sand, so the production cost can be reduced, breaking and cracking are not caused during use, and casting scraps are avoided; and the cross sections of the inner runners have high length-width ratio and few contact heat sections, so shrinkage cavity and shrinkage porosity defects at the contact part are avoided.

Description

The bottom gating of belt section ingate

Technical field

The invention belongs to casting technology field, specifically is the bottom gating of belt section ingate.

Background technology

In foundry engieering, molten metal injected needs a passage in the die cavity, be referred to as running gate system usually.Running gate system generally is made up of sprue, cross gate, ingate.Heavy castings often adopt bottom gating, are about to molten metal and inject die cavity from the bottom of die cavity, and it is steady that this running gate system is filled type, is difficult for producing turbulent flow and splash phenomena.The method of offering of the ingate of bottom gating earthenware commonly used in actual production is introduced die cavity as ingate with molten metal.The cross section of earthenware is annular, has following shortcoming during use: 1. the ingate sectional area is big or small limited, and the heavy castings more than the 10T in order to guarantee poring rate, are needed to use the earthenware of a greater number, and it is bigger to take up space, and causes placer iron than high; 2. earthenware increases production cost on the one hand as ingate, can cause because of the porcelain tube quality problems on the other hand crushing and cracking phenomenon in use to occur, can cause foundry goods to scrap when serious; 3. shrinkage cavity, shrinkage defect are easily caused in the position that contacts with porcelain tube on foundry goods.

Summary of the invention

The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome existing running gate system to use the shortcoming that porcelain tube is high as the placer iron ratio that ingate causes, easily cause shrinkage cavity and shrinkage defect and foundry goods to scrap, and a kind of bottom gating of belt section ingate is provided.

For solving the technical problem that the present invention proposes, the technical scheme that the bottom gating of belt section ingate of the present invention adopts is: it comprises sprue, the cross gate of connection, at least two ingates, die cavity, described cross gate, ingate are positioned at the below of described die cavity, described ingate is vertical and is communicated with described cross gate from the bottom of described die cavity, it is characterized in that described ingate forms ribbon-like cross section by molding sand.

As the optimization technique measure, the length-width ratio of described ingate cross section is 3-12:1.

As the optimization technique measure, described cross gate is circular, and described ingate is evenly arranged along cross gate.Especially, the centre of described cross gate is provided with and is positioned at diametric first connected channel of cross gate, lead to second connected channel from the middle part of this first connected channel, this second connected channel connects the lower end of described sprue, and the two ends of described first connected channel are communicated with cross gate.

As the optimization technique measure, the lower end of described ingate is communicated with described cross gate by connectedness.

As the optimization technique measure, it is big that the width of described ingate cross section becomes from bottom to top gradually, and the length of described ingate cross section diminishes from bottom to top gradually.

The present invention is designed to belt section with ingate, can increase the ingate sectional area, be beneficial to the poring rate that guarantees heavy castings, and placer iron is than low; This ingate is formed by molding sand, can reduce production costs, and in use crushing and cracking phenomenon can not occur, avoids foundry goods to scrap; The length of this ingate cross section and wide large percentage, the contact thermal center is less, avoids the contact site to cause shrinkage cavity, shrinkage defect, and ingate quantity can be less during use, and is simple to operate.

Description of drawings

Fig. 1 is a facade cross-sectional schematic of the present invention.

Fig. 2 is that A-A among Fig. 1 is to cutaway view.

Number in the figure explanation: 1-sprue, 2-cross gate, 3-ingate, 4-die cavity, 5-first connected channel, 6-second connected channel, 7-connectedness, the length of L-cross section, the width of D-cross section.

The specific embodiment

The present invention will be further described by a preferred embodiment below in conjunction with Figure of description.

The bottom gating of belt section ingate of the present invention, as shown in Figure 1, 2, it comprises the sprue 1, cross gate 2 of connection, at least two ingates 3, die cavity 4, cross gate 2, ingate 3 are positioned at the below of die cavity 4, ingate 3 is vertical and is communicated with cross gate 2 from the bottom of die cavity 4, and ingate 3 forms ribbon-like cross section by molding sand.Described ribbon-like cross section is meant the width D of the length L of cross section greater than cross section, especially the length-width ratio of ingate cross section (being the ratio of the width D of the length L of cross section and cross section) is 3:1 to 12:1, during concrete enforcement, this cross section can be the part of annular as shown in Figure 2, also can be rectangular.Further, in order to make molten metal can inject die cavity uniformly, cross gate 2 is circular, ingate 3 is evenly arranged along cross gate 2, especially the centre of cross gate 2 is provided with and is positioned at cross gate 2 diametric first connected channels 5, lead to second connected channel 6 from the middle part of this first connected channel 5, this second connected channel 6 connects the lower end of sprue 1, and the two ends of first connected channel 5 are communicated with cross gate 2.For easy to operate and manufacturing casting mold, the lower end of ingate 3 is communicated with cross gate 2 by connectedness 7.In order to guarantee that molten metal hangs down flow velocity, big flow injects die cavity, it is big that the width D of ingate cross section becomes from bottom to top gradually, and the length L of described ingate cross section diminishes from bottom to top gradually.

During cast, molten metal enters die cavity through sprue, second connected channel, first connected channel, cross gate, connectedness, ingate, forms foundry goods behind the crystallisation by cooling.Owing to adopted the ingate of belt section, increased the ingate sectional area, be beneficial to the poring rate that guarantees heavy castings, and placer iron is than low; This ingate is formed by molding sand, can reduce production costs, and in use crushing and cracking phenomenon can not occur, avoids foundry goods to scrap; The length of this ingate cross section and wide large percentage, the contact thermal center is less, avoids the contact site to cause shrinkage cavity, shrinkage defect, and ingate quantity can be less during use, and is simple to operate.

Claims

1. the bottom gating of belt section ingate, the sprue (1), cross gate (2), at least two ingates (3), the die cavity (4) that comprise connection, described cross gate (2), ingate (3) are positioned at the below of described die cavity (4), described ingate (3) is vertical and is communicated with described cross gate (2) from the bottom of described die cavity (4), it is characterized in that described ingate (3) forms ribbon-like cross section by molding sand.

2. the bottom gating of belt section ingate according to claim 1 is characterized in that the length-width ratio of described ingate (3) cross section is 3:1-12:1.

3. the bottom gating of belt section ingate according to claim 1 is characterized in that described cross gate (2) is circular, and described ingate (3) is evenly arranged along cross gate (2).

4. the bottom gating of belt section ingate according to claim 3, the centre that it is characterized in that described cross gate (2) is provided with and is positioned at diametric first connected channel of cross gate (2) (5), lead to second connected channel (6) from the middle part of this first connected channel (5), this second connected channel (6) connects the lower end of described sprue (1), and the two ends of described first connected channel (5) are communicated with cross gate (2).

5. the bottom gating of belt section ingate according to claim 1 is characterized in that the lower end of described ingate (3) is communicated with described cross gate (2) by connectedness (7).

6. the bottom gating of belt section ingate according to claim 1 and 2, the width (D) that it is characterized in that described ingate (3) cross section becomes big from bottom to top gradually, and the length (L) of described ingate (3) cross section diminishes from bottom to top gradually.