A processing method for thin-wall curved surface structural parts of silicon nitride composite ceramic high temperature resistant composite material
A technology of silicon nitride complex phase and composite materials, which is applied in the direction of stone processing tools, stone processing equipment, manufacturing tools, etc., can solve the problems of difficult and easy processing defects, and achieve the effect of avoiding processing defects
Active Publication Date: 2020-07-28
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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Problems solved by technology
Due to the hard and brittle characteristics of this material, and the wall thickness gradually becomes thinner during processing, it is not easy to directly clamp it with a vise or a pressing plate, and it is easy to produce processing defects
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Embodiment 1
[0019] A processing technology for a silicon nitride composite ceramic high-temperature-resistant composite material structure, comprising the following steps:
[0020] 1. Bond the silicon nitride composite ceramic high-temperature-resistant composite material blank to the aluminum block, and use PCD diamond milling the concave surface of the parts, the allowance is 5mm.
[0021] 2. When rough machining the concave surface, the reciprocating tool rail is used to feed the tool from the middle, that is, the lowest point of the part, and process to the top of the arc on both sides. The rough machining parameters are 5000r / min, and the feed rate is 2500mm / min. Cutting depth is 1mm. This method avoids edge chipping and prolongs tool life.
[0022] 3. Use PCD diamond milling head processes concave surface to model size.
[0023] 4. During finishing, follow the surrounding cutting tool mode, the tool rotation is consistent with the tool feeding direction, the grinding feed rate...
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The invention belongs to the field of machining of thin-walled curved-surface structural parts and particularly relates to a method for machining a thin-walled curved-surface structural part of a silicon nitride multiphase ceramic high temperature resistant composite material. The method for machining the thin-walled curved-surface structural part of the silicon nitride multiphase ceramic high temperature resistant composite material comprises the steps that the silicon nitride multiphase ceramic high temperature resistant composite material is put in a numerical control machining center, andspecial technological equipment is utilized so that adhesion and clamping can be conducted; a diamond end milling cutter and a diamond ball-end cutter are utilized so that rough machining can be conducted, a reciprocating tool path is adopted on a concave surface, and the cutters enter from the middle, that is to say, machining is conducted from the lowest position the part to the tops of arcs onthe two sides; when rough machining is conducted on a convex surface, a reverse cutter moving manner is adopted; and a diamond milling grinding head is utilized so that finish machining is conducted,the cutter moving manner of following the periphery is adopted by the finish machining numerical control program, and the rotation direction of the cutters is consistent with the feeding direction ofthe cutters. According to the method for machining the thin-walled curved-surface structural part of the silicon nitride multiphase ceramic material provided, reasonable technological parameters are set; matched cutters and cutter moving manners are adopted; special tools are designed; and machining defects of the material can be avoided.
Description
technical field [0001] The invention belongs to the processing field of thin-wall curved surface structural parts, and in particular relates to a processing method for thin-wall curved surface structural parts of silicon nitride multiphase ceramic high-temperature-resistant composite materials. Background technique [0002] Part material Silicon nitride composite phase ceramic high temperature resistant composite material is a high hardness and high brittle ceramic material, and there are few reports on processing. Therefore, the understanding of the processing characteristics of this material still depends on traditional ceramic processing methods and techniques. The traditional processing method has serious tool wear and low durability, which greatly increases the processing cost of the product. Especially for high-precision dimensions, tool wear makes it difficult to achieve precise machining and unstable dimensions. The material is prone to chipping damage during proces...
Claims
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IPC IPC(8): B28D1/18B24B1/00
CPCB24B1/00B28D1/18
Inventor 安文洁陈臣
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP