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Valve rod bending and deforming straightening process

A bending deformation and valve stem technology, which is used in metal processing, manufacturing tools, metal processing equipment, etc., can solve the problems of unstable control deformation and long cycle, and achieve good deformation effect, low use cost and high straightening accuracy. Effect

Inactive Publication Date: 2018-11-23
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of the existing valve stem bending deformation straightening method, the cycle is long, the control deformation is unstable, the deformation is large or small, and the high point needs to be repeatedly pressed repeatedly, and a valve stem bending deformation straightening process is proposed

Method used

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  • Valve rod bending and deforming straightening process

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the specific steps of a valve stem bending deformation straightening process described in this embodiment are as follows:

[0014] Step 1. Install the valve stem 1 to be repaired on the grinding machine, tighten both ends of the valve stem 1 with the top, start the grinder, check the beating and deformation of the valve stem 1, and mark the high point on the valve stem 1 with a marking pen;

[0015] Step 2. Place the valve stem 1 freely on the ground, with the high point marked in step 1 facing up;

[0016] Step 3, use gas welding equipment to heat the high point of the valve stem 1;

[0017] Step 4. Cool the valve stem 1 to room temperature naturally, then install the valve stem 1 on the grinding machine, tighten the two ends of the valve stem 1 with the top, start the grinder, check the beating and deformation of the valve stem 1, if the valve stem 1 If the alignment is not in place, r...

specific Embodiment approach 2

[0018] Specific implementation mode two: combination figure 1 Describe this embodiment, the valve stem bending deformation straightening process described in this embodiment is characterized in that: in step 3, the high point of the valve stem 1 is heated, the heating temperature is 580 ° C ~ 750 ° C, and the heating time is 10 ~20 seconds.

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Abstract

The invention relates to a straightening process, in particular to a valve rod bending and deforming straightening process and belongs to the field of machining. The valve rod bending and deforming straightening process aims to solve the problems that an existing valve rod bending and deforming straightening method is long in period, unstable in deforming control and large or small in deforming changing, and multi-time repeated pressing of a high point is needed. The valve rod bending and deforming straightening process includes the steps that firstly, a valve rod needing to be restored is installed on a grinding machine, the two ends of the valve rod are tightly ejected with centres, a grinding machine is started, the bouncing and deforming quantity of the valve rod is inspected, and a high point on the valve rod is marked with a marking pen; secondly, the valve rod is freely placed on the ground, and the high point marked in the first step faces upwards; thirdly, a gas welding deviceis adopted, and the high point of the valve rod is heated; and fourthly, the valve rod is naturally cooled to room temperature, then the valve rod is installed on the grinding machine, the two ends of the valve rod are ejected tightly with the centres, the grinding machine is started, the bouncing and deforming quantity of the valve rod is inspected, and if valve rod straightening is not in place, the steps from the first step to the third step are repeated.

Description

technical field [0001] The invention relates to a straightening process, in particular to a valve stem bending deformation straightening process, which belongs to the field of mechanical processing. Background technique [0002] The valve stem with nitriding requirements has a length of 868.8mm, a diameter of φ38, and a ratio of length to diameter of about 23. It is a slender rod. The surface hardness of the nitrided layer is not less than HV695, the depth of the nitrided layer is not less than 0.2mm, and the brittleness is not greater than grade 3. [0003] Leave a margin of 0.05mm on each side before nitriding, and bend 0.05-0.12mm after nitriding, which cannot meet the requirements of subsequent grinding, resulting in product scrapping. The deformation of the valve stem after nitriding is often mechanically straightened, that is, a manual press or external force is applied to the high point of deformation, and it is kept for a certain period of time to cause plastic defo...

Claims

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Application Information

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IPC IPC(8): B21D3/00B21C51/00
CPCB21D3/00B21C51/00
Inventor 魏成双隋朝龙吴爽新孙盛丽刘剑姜秀英岳云淼宋佳博
Owner HARBIN TURBINE
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