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Casting process for embedded steel pipe of lathe bed with cooling pipe

A technology of casting technology and cooling pipe, which is applied in the field of embedded steel pipe casting technology, can solve problems affecting the quality of castings, and achieve the effect of reducing hindered bending

Pending Publication Date: 2022-03-01
德州卓尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This deviation seriously affects the casting quality

Method used

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  • Casting process for embedded steel pipe of lathe bed with cooling pipe
  • Casting process for embedded steel pipe of lathe bed with cooling pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Since the guide rail surface at the pre-embedded steel pipe is 120mm, the thickness of the casting reaches 120mm. In order to accelerate cooling, the outer surface of the casting is laid with coated sand chill iron. According to the usual pouring scheme, use Porcelain tube is used as the inner gate, and a layer of gate is set on the top of the casting shape to supplement the pouring gap. The pouring time is 120-130S and the pouring temperature is 1380-1400℃. In order to prevent the pre-embedded steel pipe from bending and deformation during casting and cooling, Place three clips at intervals of 600mm to fix, loosely fill 50mm asbestos rope at both ends of the steel pipe, and use asbestos rope to block the gap at both ends of the steel pipe to prevent molten iron from flowing into the steel pipe through the gap during casting, causing the steel pipe to be blocked and scrapped.

Embodiment 2

[0031] Verification of Steel Tube Melt Resistance: Preparation 4 pieces of round steel of the same material, coated with specified paint, including high temperature resistant materials, dried for later use. When the furnace is turned on, put it into the ladle at a temperature higher than 1450°C to check the melting condition. The situation is as follows:

[0032] Bar No. Hot metal temperature heating time degree of paint damage test rod melting 1 1460℃ 60S intact none 2 1460℃ 90S intact none 3 1465℃ 300S slightly damaged none 4 1460℃ 30S No paint protection melt fillet

[0033] Under the condition of coating protection, the round steel will not melt within a certain period of time, so the pre-embedded pipe body 2 coated with high-temperature resistant materials is selected, and the heating time is guaranteed not to exceed 130s, and the heating time in hand The interval guarantees a suitable heating temperature of...

Embodiment 3

[0035] Verify the bending of steel pipes: take 2 steel pipes of 2000mm, one of which is welded with 3 clips and 6 places are evenly distributed, and the other is not provided with clips, respectively embedded in a cavity of 150x150x1800mm, and loosely filled with 50mm asbestos rope at both ends of the steel pipe , After pouring, the position of the steel pipe fixed with clips meets the requirements, and the steel pipe without clips still bends. Therefore, it is decided that in actual production, in addition to the measures that the steel pipe can be heated and elongated, it should be fixed with clips to control the bending deformation.

[0036] Embodiment 2 and Embodiment 3 of this scheme are verification experiments for Embodiment 1 to verify the temperature and implementation time of Embodiment 1, and the fixing method of the pipe body.

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Abstract

A casting process for an embedded steel pipe with a cooling pipe lathe bed is characterized by comprising a casting mold, an embedded pipe and a hedging casting process, the key for solving the problem of melting of the steel pipe is to prevent heat from diffusing to the surface of the steel pipe, a high-temperature-resistant coating is used in the scheme and smeared to the surface of the steel pipe thinly, and in order to solve the problem of bending of the steel pipe, a method of dredging and blocking is adopted in the scheme. Certain measures are taken, the steel pipe can freely stretch when being heated in a casting mold, and blocked bending is reduced. Certain measures are taken for blocking to control deformation of the steel pipe.

Description

technical field [0001] The invention relates to the technical field related to casting of machine tools, in particular to a casting process for pre-embedded steel pipes with a cooling pipe bed. Background technique [0002] Since the embedded steel pipe is Steel pipes are used for cooling water, the inner hole is small, and the pipe is slender. Once the steel pipe is melted, the piece will be scrapped. The steel pipe is made of Q235, with a melting point of about 1520°C. Theoretically, the steel pipe can remain unmelted at around 1400°C. But according to practical experience, High-quality steel pipes will melt quickly in molten iron at 1400 ° C, and the melting will be faster under the condition of molten iron washing. The mechanism of steel pipe melting: the steel pipe is in the molten iron, the temperature rises instantly, which is the same as the temperature of the molten iron. Under this condition, the C in the molten iron diffuses to the surface of the steel pipe,...

Claims

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Application Information

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IPC IPC(8): B22D19/04B22D15/00
CPCB22D19/045B22D15/00
Inventor 罗柏强李建旺
Owner 德州卓尔科技有限公司