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Diesel engine piston head and numerical control machining process thereof

A processing technology and piston head technology, which is applied in the field of diesel engine piston head and its numerical control processing technology, can solve the problems of numerous piston head processing procedures, affecting enterprise benefits, and high processing costs, so as to improve efficiency and work stability, and improve processing The efficiency and the effect of reducing drag

Pending Publication Date: 2020-08-07
SHANGHAI JIAN QIAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual processing, there are many processing procedures of the piston head, some of which are difficult to process, and the processing cost is high, which affects the benefits of the enterprise

Method used

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  • Diesel engine piston head and numerical control machining process thereof
  • Diesel engine piston head and numerical control machining process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A diesel engine piston head, such as Figure 1~2 As shown, it consists of a thin-walled tube and a top 3 arranged at the top of the thin-walled tube. The upper end surface 31 of the top is in a concave arc shape. The thin-walled tube is composed of a ring groove tube 1 and a tapered tube 2 arranged one above the other. , The ring groove cylinder 1 is cylindrical with the same outer diameter (that is, the distance from the outer wall of the ring groove cylinder 1 to the central axis of the piston head is equal), with multiple ring grooves 11, the outer diameter of the tapered cylinder 2 from bottom to top Gradually become smaller. The top of the piston head is an integral part of the combustion chamber. By setting it as a concave, it is beneficial to the formation and combustion of combustible mixed gas. The concave can also be used to adjust the compression ratio of the internal combustion engine.

[0036] In this embodiment, the ring groove 11 is provided with three chan...

Embodiment 2

[0040] A numerical control machining process for a piston head of a diesel engine is used for machining the piston head of a diesel engine of Example 1. Preferably, the machining process is processed by a five-axis linkage turning center, and includes the following steps:

[0041] S1: Use the three-jaw chuck to clamp the outer circle of the blank, and use the outer turning tool to process the outer surface and top end surface of the thin-walled cylinder through rough turning and finishing. In this embodiment, the outer turning tool is used Rough turning and finishing turning the outer circle and end face with a diameter of 348.4mm;

[0042] S2: Use the inner turning tool to process the inner surface of the ring groove cylinder, the inner surface of the tapered cylinder, the inner circle of the inner cavity boss and the lower end surface of the inner cavity boss through rough turning and finishing turning. In this embodiment, use Internal turning tool for rough turning and finishing...

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Abstract

The invention relates to the technical field of diesel engine pistons, in particular to a diesel engine piston head and a numerical control machining process thereof. The diesel engine piston is composed of a thin-wall barrel and a top arranged at the top end of the thin-wall barrel. An upper end face of the top is in the shape of a cambered surface with is concave downwards. The thin-wall barrelis composed of an annular groove barrel and a conical barrel, wherein the annular groove barrel is arranged above the conical barrel. The annular groove barrel is in the shape of a cylinder which is consistent in outer diameter and is provided with multiple annular grooves. The outer diameters of the conical barrel decrease gradually from bottom to top. According to the machining process, machining is carried out roughly in accordance with the sequence of turning of an outer circle, the annular grooves and end faces; turning of an inner circle and the outline of an inner chamber; and machiningof threaded holes and a groove inside the piston head. Compared with the prior art, with the diesel engine piston head and the numerical control machining process thereof, the efficiency and the working stability of an engine can be effectively improved, the machining procedure is arranged in a reasonable and proper manner, and the high machining efficiency is achieved.

Description

Technical field [0001] The invention relates to the technical field of diesel engine piston heads, in particular to a diesel engine piston head and its numerical control processing technology. Background technique [0002] The piston is a reciprocating part in the cylinder block of a diesel engine. The piston head of a diesel engine is an important part of the piston. It is characterized by thin-walled cylindrical parts with poor radial stiffness. Its main working surface is the top, ring groove, etc. The top is the main part of the combustor, and its shape is related to the selected combustor form. An excellent top design can help the formation and combustion of combustible mixtures. In addition, the resistance of the piston head to reciprocate in the cylinder block also has a certain impact on engine efficiency and stability. [0003] Moreover, in the processing process, there are higher requirements for the size, shape and position accuracy of the piston head. In actual proce...

Claims

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Application Information

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IPC IPC(8): F02F3/26F02F3/28B23B5/00B23P15/10
CPCF02F3/26F02F3/28B23P15/10B23B5/00
Inventor 罗中华徐子航高羿
Owner SHANGHAI JIAN QIAO UNIV
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