Process for formed hydraulic tappet guide cylinder

A hydraulic tappet and process technology, which is applied to metal extrusion dies, engine components, machines/engines, etc., can solve the problems of uneven grain size, segregation and porosity, and poor fatigue resistance of materials. The effect of refining, improving mechanical properties, and improving performance

Inactive Publication Date: 2007-09-05
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the casting process of the existing products, the grain size of the material itself is uneven, the structure is not dense enough, and there are defects such as segregation and looseness, which makes the mechanical properties of the part material, especially the fatigue resistance performance poor.

Method used

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  • Process for formed hydraulic tappet guide cylinder
  • Process for formed hydraulic tappet guide cylinder
  • Process for formed hydraulic tappet guide cylinder

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Embodiment Construction

[0014] In the present invention, the bar material and the band saw are cut first, and then the front cavity and the rear cavity with the protruding nose and the core are extruded in the guide cylinder by a warm plastic extrusion process, and then the ring shape is processed by a normal temperature rolling forming process. Oil delivery tank, other dimensions are obtained by machining.

[0015] Referring to Figure 3, there is an annular cooling spray device around the punch of the warm plastic extrusion die, and the water vapor mixed with cooling water and compressed air passes through several nozzles to cool the punch to achieve the best cooling effect. The die adopts a three-layer combined die with pre-tightening force, which can withstand a large unit extrusion force. The concave mold is equipped with an annular cooling channel, through the cooling of circulating water, the mold temperature can be effectively reduced, and the service life and production efficiency of the mold...

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Abstract

A technology for forming a guide barrel body of hydraulic tappet includes such steps as providing rod material, blanking by sawing, extruding to form front and back cavity, rolling to form annular oil slot and reinforcing ribs, and machining. It has high mechanical performance and fatigue resistance.

Description

[technical field] [0001] The invention relates to the technical field of processing technology of a guide cylinder, and particularly designs a process for forming a guide cylinder of a hydraulic tappet. [Background technique] [0002] The shape of the guide cylinder is shown in Figure 1. The material of the parts is 20CrMnMo, which is mainly composed of oil groove 01, rib 02, front cavity 03 and rear cavity 04. The shape of the cavity of this part is complex, and the inner wall forms a nose-shaped protrusion due to the arrangement of oblique oil holes. At the same time, there is a ring-shaped oil delivery groove on the outer surface of the cavity, thus forming a ring-shaped reinforcing rib on the inner wall of the cavity. The original production process of this part is precision casting plus machining and final forming. Since the precision casting process requires a special production line, the investment in equipment is large, and investment mold manufacturing requires spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23P13/00B21C25/02B21H1/06F01L1/46F01L1/14
Inventor 张水忠徐新成
Owner SHANGHAI UNIV OF ENG SCI
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