There are two main types of foundry parts: special foundry and sand foundry.
1. Ordinary sand foundry uses sand as the mold material. There are three types of wet sand molds, dry sand molds and chemically hardened sand molds. Its cost is low and the sand can be reused. But its mold making is time consuming.
2. According to the material, special foundry can be divided into two categories: special foundry with natural mineral sand and gravel as the main molding material and special foundry with metal as the main foundry material.
The technical requirements of foundry parts affect the working performance of the parts on the one hand, and are directly related to the economy and feasibility of the foundry process on the other hand. People often ask the editor, what are the technical requirements for the processing of foundry mold parts? Today, I will share with you a brief analysis.
1. The dimensional accuracy of the machined surface of the parts;
2. Parts machining shape accuracy;
3. Part surface roughness;
4. The mutual position accuracy between the machined surfaces of the parts;
5. The hardness and heat treatment requirements of the parts;
6. Other special requirements.
Usually in the process of foundry parts processing, with the improvement of the surface precision of the parts, a finer surface roughness will inevitably be obtained at the same time, but as the surface roughness of the foundry parts is worth reducing, the processing cost will increase. Therefore, when the operator decides the accuracy, he must first ensure the performance requirements of the parts, and also consider many factors such as the process conditions and the manufacturing cost of the parts.
The first step in the production of foundry parts is to determine the process of foundry parts according to the structural characteristics of the parts, technical requirements and production batch conditions, and draw the foundry process diagram. For mass production or special important foundries, it is necessary to carry out detailed process design, and draw foundry drawings as the basis for template design and foundry inspection. For single-piece and small-batch production, the foundry process design is relatively simple, and only the foundry process diagram needs to be drawn.
The foundry process includes the following contents: pouring position and parting surface position of the foundry, process parameters such as machining allowance, shrinkage rate and draft angle, core and core head structure, gating system, arrangement of risers and cold iron, etc.
- Selection of pouring position and parting surface of foundry parts
1. The concept of foundry position and parting surface of foundry parts
The pouring position of the foundry part refers to the spatial position of the foundry in the mold when pouring. The parting surface of the foundry refers to the joint surface that separates the mold to take the mold. The parting surface determines the position of the foundry during modeling. Usually the molding position of the foundry is the same as the pouring position, but it is different in individual cases.
2. Selection of foundry position and parting surface of foundry parts
The pouring position and parting have a great influence on the foundry quality and foundry process, and must be carefully considered. First of all, the quality requirements of foundries should be guaranteed, and secondly, the operation should be simplified as much as possible, and the specific production conditions should also be considered.
2. Determination of process parameters of foundry parts
The process parameters of foundry parts are some process data related to the foundry process. They should be affected by the shape, size and structure of the core box. Improper selection will affect the accuracy, productivity and cost of the foundry.
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