Lug Part

Contents

Introduction

1. PART DESIGN ANALYSIS, PURPOSE AND PROCESSABILITY

2. DEFINITION OF CASTING METHOD

3. SELECTION OF CASTING POSITION IN MOLD, MODEL PARTING SURFACE

4. DETERMINATION OF MECHANICAL MACHINING ALLOWANCES

5. TYPE SELECTION AND RUNNER SYSTEM CALCULATION

6. FABRICATION OF MODELS AND ROD BOXES

7. DESIGN OF SLABS AND MODEL SLABS

Bibliographic list

Introduction

The importance of foundry in the national economy is extremely great; almost all machines and instruments have foundry parts.

Casting is one of the oldest methods that was used in ancient times for the production of metal products: in the beginning from copper and bronze and then from cast iron, and later from steel and other alloys.

In 1868, for the first time at the Maltsevsky factories there were steel shaped castings.

The main processes of foundry production are: metal smelting, mold making, metal pouring and cooling, knocking out, cleaning, casting cutting, heat treatment and quality control of processing.

The main method of making castings is sand casting, in which about 80% of castings are obtained. However, the accuracy and roughness of the surface of castings obtained in sandy forms in many cases do not meet the requirements of modern mechanical engineering.

Foundry production allows to obtain blanks of complex configuration with minimum allowance for cutting and with good mechanical properties. The manufacturing process is mechanized and automated, which reduces the cost of cast blanks. The achievements of modern science in many cases make it possible to radically change the technological process, dramatically increase the new high-performance machines and machines. Which ultimately helps to improve product quality and production efficiency.

Part Design Analysis, Purpose, and Processability

The " eye" part is intended for operation under static and dynamic loads. Overall dimensions: 267x270x270. Casting of the 2nd difficulty group.

I will cast the part from SCH 18 alloy (GOST 141270). The main casting properties for our casting are shrinkage and fluid flow, which affects the filling of the mold, the formation of internal stresses, shrinkage shells. SCh 18 has good fluid flow, linear shrinkage of 1.2%. Transitions from thin sections of castings to massive ones are made by means of fillets. Forming slopes 1 ° I make a hole inside the part using a rod.

Fabrication of models and rod boxes

Metal models and rod boxes are made by casting in earthen forms, while for molding we use special wooden models - model models.

When making a submodel, we take into account the double shrinkage of the metal: the cast part and the model alloy.

Machining allowance is taken into account - total. In all cases, it is necessary to strive to prevent excessive fur allowance. processing.

To simplify manufacturing, the rod box is made detachable with a horizontal connector.

Design of supports and model slabs

Opokes are designed as per GOST 1497569, with dimensions in the light L = 400 mm

B = 300 mm, symbol:

Support 02620034 GOST 1497569.

Support 02620034 GOST 1497569.

Model slabs are designed as per GOST 2010174, with dimensions L = 450 mm

B = 350 mm, symbol:

Model plate 02801255 GOST 2010174.