Cast moulding core for gear
A technology for casting gears and cores, which is used in casting molding equipment, casting molds, cores, etc., can solve the problems of affecting the quality of the cavity and can not meet the requirements of no cutting, and achieve the effects of good toughness, saving raw materials, and reducing noise.
Inactive Publication Date: 2005-12-21
陈明海
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Problems solved by technology
[0003] Chinese patent application 00223241.3 discloses a kind of ejector sleeve plate used for spur gear sand casting. This technology, due to the arrangement of the ejector gear sleeve plate, prevents the problem of sand in the mold to a certain extent. As a result, It is a step towards no-cutting and less-cutting tooth-shaped casting gears, but since the traditional up-and-down direction is still used to draw the mold, it is necessary to leave a gap between the tooth shape of the inner cavity of the drawing tooth sleeve plate and the tooth shape of the gear model 0.2-0.6mm, and the existence of this gap affects the quality of the cavity, which cannot meet the requirements of no-cutting and less-cutting tooth profile casting gears
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[0018] Such as figure 1 shown.
[0019] A casting gear core, the overall structure of which includes a core whose outer ring is in the shape of a gear model tooth, the core includes a central fixed disk 1, and an outer ring core block 2 that cooperates with the fixed disk 1; the described The pellets are arranged in a circular pattern. The outside of the pellets 2 is tooth-shaped, and the inside of the pellets is a pellet dovetail. The dovetails of each pellet correspond to the dovetail grooves arranged on the outside of the fixed plate.
[0020] In order to be combined into a circle, the pellet 2 has two forms, one is a pellet dovetail 7 with a large inside and a small outside in the arc, and the other is a pellet dovetail 71 with a small inside and a large outside in the arc, no matter which one All forms of pellets are serialized as much as possible to reduce the number of components. Pellet dovetail 7 is the first module during ejection, only after the adjacent pellet do...
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This present invention relates to a founded gear core which belongs to the founding technology field. It mainly solves the problem of gear wheel founding precise. Its character is that this core comprises a center fixed tray and exterior core pieces which work on the fixed tray. When taking model, firstly take the fixed tray up, then take the core pieces whose interior is big and exterior small along the radial, finally take the whole core pieces. This invention breaks up the traditional mould-lifting method which can satisfy the necessary of non-cutting when processing gear wheel.
Description
technical field [0001] The invention relates to the technical field of sand casting, in particular to a core for spur gear sand casting. Background technique [0002] The sand casting of spur gears is the same as the sand casting of other parts, the tooth shape of the model must be made with a draft slope, otherwise it is easy to carry sand when the mold is drawn, it is not easy to repair the mold, and it is difficult to ensure the quality of the cavity, which cannot meet the requirements. Requirements for no-cutting and less-cutting tooth-shaped casting gears. To some extent, traditionally, the mold drawing is in the up and down direction. [0003] Chinese patent application 00223241.3 discloses a kind of ejector sleeve plate for spur gear sand casting. This technology, because the ejector sleeve plate is provided, prevents the problem of sand in the mold to a certain extent. As a result, It is a step towards no-cutting and less-cutting tooth-shaped casting gears, but sin...
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IPC IPC(8): B22C9/28
Inventor 陈明海
Owner 陈明海