阅读说明：本技术 一种风电轴承座无冷铁的铸造生产方法 (Casting production method of cold-iron-free wind power bearing block ) 是由 唐仁芬 莫国先 张词 柏栋 欧夏天 于 2021-01-11 设计创作，主要内容包括：本发明公开了一种风电轴承座无冷铁的铸造生产方法,可以减少铸件产生冷铁气孔的风险,提高产品合格率,同时大大提高生产效率,降低生产成本。一种风电轴承座无冷铁的铸造生产方法,浇注系统的横浇道通过过滤砖分为两层；浇注系统的内浇口采用底注批缝式内浇口；轴承座长度方向两端各设置一个暗冒口与顶冒口,对应风电轴承座中心孔的位置设置两个暗冒口；浇注系统的浇口杯采用匝门式池型浇口杯或拔塞式浇口杯；砂型抗拉强度大于1.2MPa；砂箱钢板厚度大于25mm,取消冷铁。(The invention discloses a chill-free casting production method of a wind power bearing pedestal, which can reduce the risk of producing chill blowholes on castings, improve the product percent of pass, greatly improve the production efficiency and reduce the production cost. A casting production method of a wind power bearing seat without chilling blocks is characterized in that a cross gate of a pouring system is divided into two layers through filter bricks; an inner pouring gate of the pouring system adopts a bottom pouring batch seam type inner pouring gate; two ends of the bearing seat in the length direction are respectively provided with a blind riser and a top riser, and two blind risers are arranged at positions corresponding to the center hole of the wind power bearing seat; the pouring cup of the pouring system adopts a gate-type pool-type pouring cup or a plug-pulling type pouring cup; the tensile strength of the sand mold is more than 1.2 MPa; the thickness of the steel plate of the sand box is more than 25mm, and a chill is omitted.)

1. A casting production method of a wind power bearing block without chilling blocks is characterized by comprising the following steps:

a cross gate of the pouring system is divided into two layers by a filter brick;

an inner pouring gate of the pouring system adopts a bottom pouring batch seam type inner pouring gate;

two ends of the pouring system are respectively provided with a blind riser, and the pouring system is provided with two blind risers corresponding to the position of the central hole of the wind power bearing seat;

the pouring cup of the pouring system adopts a gate-type pool-type pouring cup or a plug-pulling type pouring cup;

the tensile strength of the sand mold is more than 1.2 MPa;

the thickness of the steel plate of the sand box is more than 25mm, and a chill is omitted.

2. The method for casting and producing the wind power bearing seat chill according to claim 1, wherein the method comprises the following steps: the wall thickness of the wind power bearing seat is more than 100mm, the material is QT350-22AL, the subsequent processing mode is cold punching at minus 30-50 ℃, and ultrasonic flaw detection and magnetic particle flaw detection are carried out.

3. The method for casting and producing the wind power bearing seat chill according to claim 1, wherein the method comprises the following steps: the sand mould is made of resin sand.

4. The method for casting and producing the wind power bearing seat chill according to claim 1 or 3, wherein the method comprises the following steps: the sand mould adopts a jolt ramming table for jolting.

5. The method for casting and producing the wind power bearing seat chill according to claim 1, wherein the method comprises the following steps: the pair of blind risers at the two ends of the gating system are rectangular, the pair of top risers are adjacently arranged to form a circle, the pair of blind risers arranged at the position, corresponding to the center hole of the wind power bearing seat, of the gating system are circular, and the connecting lines of the two pairs of blind risers are perpendicular to each other.

6. The method for casting and producing the wind power bearing seat chill according to claim 1, wherein the method comprises the following steps: a1.5 mm steel plate is placed at the pouring gate of the pouring cup, and hot air is blown for 3-4 hours before pouring to bake.

Technical Field

The invention relates to the technical field of casting, in particular to a method for casting a wind power bearing seat without chilling blocks.

Background

Wind-powered electricity generation bearing frame material QT350-22AL need carry out low temperature impact test at 40 ℃ below zero, the general wall thickness of whole foundry goods all is more than 100mm, even thick position has more than 300mm, need carry out ultrasonic inspection and magnetic particle inspection to whole foundry goods, the quality grade of detecting a flaw is not less than EN 12680-3's 2 level standard, namely be not more than 15000 at core defect area, be not more than 1000 at edge defect area, the casting degree of difficulty is very big, traditional process produces so thick foundry goods, it accelerates the heat festival cooling to satisfy the requirement of detecting a flaw to adopt at thick major part addition chiller usually, nevertheless under the condition of adding the chiller, can produce a series of derived problems usually:

1. the surface of the chill is tightly attached to the surface of a casting, so the surface quality of the chill is directly influenced by the smoothness of the surface quality of the chill, the use frequency of the chill is limited, the use frequency is too many, and the casting is easy to generate chill air holes.

2. The wall thickness of the bearing seat is thicker on the whole, the chills are arranged at the two ends and the inner hole, long time is consumed for arranging the chills when workers shape, the production efficiency is lower, and only about 4 pieces can be produced in one day.

3. The cast placing chiller is easily affected by air humidity to absorb moisture to generate chiller air holes, the high-requirement cast of the wind power bearing seat cannot be welded, the waste rate is high due to the fact that the air holes cannot be deeply machined or cannot be polished on a non-machined surface to be scrapped, and meanwhile the assembling progress and quality image of a customer are also affected.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for casting a wind power bearing seat without chilling blocks, which can reduce the risk of producing chilling block air holes in castings, improve the product percent of pass, greatly improve the production efficiency and reduce the production cost.

The purpose of the invention is realized as follows:

a casting production method of a wind power bearing seat without chilling blocks,

a cross gate of the pouring system is divided into two layers by a filter brick;

an inner pouring gate of the pouring system adopts a bottom pouring batch seam type inner pouring gate;

two ends of the bearing seat in the length direction are respectively provided with a blind riser and an open riser, and two blind risers are arranged at positions corresponding to the center hole of the wind power bearing seat;

the pouring cup of the pouring system adopts a gate-type pool-type pouring cup or a plug-pulling type pouring cup;

the strength of the sand mold is more than 1.2 MPa;

the thickness of the steel plate of the sand box is more than 25mm, and a chill is omitted.

Preferably, the wall thickness of the wind power bearing seat is more than 100mm, the material is QT350-22AL, the subsequent processing mode is that cold punching is carried out at minus 30-50 ℃, and ultrasonic flaw detection and magnetic particle flaw detection are carried out.

Preferably, the sand mold is made of resin sand.

Preferably, the sand mould is tamped using a jolt.

Preferably, the pair of blind risers at the two ends of the bearing seat in the length direction are rectangular, the pair of top risers are adjacently arranged to form a circle, the pair of blind risers arranged at the position corresponding to the center hole of the wind power bearing seat are circular, and the connecting lines of the two pairs of blind risers are mutually perpendicular.

Preferably, a 1.5mm steel plate is placed at the water inlet of the pouring cup, and hot air is blown for 3-4 hours for baking before pouring.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the method creatively adopts a casting process of eliminating chill, carries out scheme feasibility analysis on the structure and the material of the casting, has relatively small shrinkage tendency of the ferrite matrix material, increases the rigidity of a sand box, increases the compactness of the sand mould by adopting jolt-ramming table jolt-ramming modeling to improve the rigidity of the sand mould, utilizes the self-feeding capability of graphitization expansion, and simultaneously slows down the pouring speed to ensure that molten iron carries out liquid self-feeding in the pouring process, namely, the molten iron is poured and solidified at the same time, and then the chill can be eliminated by assisting the liquid feeding of a proper riser, thereby reducing the risk of producing chill blowholes, greatly improving the efficiency of the molding process and the subsequent cleaning and polishing process, and improving the productivity by 80-100%.

The invention adopts the bottom pouring batch seam type inner pouring gate, the jolt ramming modeling of the jolt ramming platform, the pouring speed is reduced, and the method of eliminating the chill casting is assisted by proper riser liquid feeding to produce the wind power bearing seat.

Drawings

FIG. 1 is a three-dimensional process diagram of a bearing seat without chilling blocks;

FIG. 2 is a three-dimensional process cross-sectional view;

FIG. 3 is an enlarged view of the gating system.

Reference numerals

In the attached drawing, 1 is a sprue slag-stopping steel plate, 2 is a sprue, 3 is an upper-layer cross runner, 4 is a lower-layer cross runner, 5 is a filter brick, 6 is an ingate, 7 is a side riser, 8 is a top riser and 9 is a bearing hole side riser.

Detailed Description

Referring to fig. 1-3, an embodiment of a method for casting a wind power bearing seat without chilling blocks is that the wall thickness of the wind power bearing seat is more than 100mm, the material is QT350-22AL, the subsequent processing mode is cold punching at minus 30-50 ℃, and ultrasonic flaw detection and magnetic particle flaw detection are carried out.

The runners (marked 3 and 4 in the figure) of the pouring system are divided into two layers by filter bricks (marked 5); an inner pouring gate (mark 6) of the pouring system adopts a bottom pouring batch seam type inner pouring gate; two ends of the bearing seat in the length direction are respectively provided with a blind riser (mark 7) and a top riser (mark 8), and two blind risers (marks 9) are arranged at positions corresponding to the center hole of the wind power bearing seat; the pouring cup of the pouring system adopts a gate-type pool-type pouring cup or a plug-pulling type pouring cup; the pair of blind risers at the two ends of the bearing seat in the length direction is rectangular, the top riser is circular, the pair of blind risers arranged at the position corresponding to the center hole of the wind power bearing seat is circular, and the connecting lines of the two pairs of blind risers are mutually vertical. A1.5 mm steel plate is placed at the water inlet of the pouring cup, and hot air is blown for 3-4 hours before pouring to bake.

The tensile strength of the sand mold is more than 1.2 MPa; the sand mould is molded by resin sand and is tamped by a jolt ramming platform. The thickness of the steel plate of the sand box is more than 25mm, and a chill is omitted.

A pair of blind risers marked at two ends of a bearing seat in the length direction of 7 in the drawing are rectangular, a pair of top risers (open risers) marked at 8 in the drawing are circular, a pair of blind risers marked at 9 in the drawing and arranged at positions corresponding to a center hole of a wind power bearing seat are circular, connecting lines of two pairs of blind risers are mutually vertical, liquid feeding can be carried out on a casting in all directions, meanwhile, exhaust and slag discharge are carried out, and defects such as shrinkage cavities, looseness, slag holes and the like are prevented.

In the figure, a 1.5mm steel plate is placed at a water inlet of a pouring cup marked with a mark 1, so that slag can float upwards conveniently before molten iron enters a cavity, and the situation that the slag enters the cavity to cause a casting to generate defects is prevented; meanwhile, hot air is blown for 3-4 hours before casting for baking, and the moisture in the sand mold is dried, so that the defects of air holes, impurities and the like are prevented.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.