CN105081675A - Method for machining long-thin tube parts - Google Patents

Abstract

The invention relates to a method for machining long-thin tube parts. According to the method, special low-melting-point filler alloy is blended so that it can be guaranteed that when the thin-wall long-thin tube parts are machined, the rigidity is remarkably improved, the deformation of the parts is remarkably lowered, and the size is easier to guarantee. By means of the method, production efficiency and product quality are improved, and the rejection rate is lowered. The method includes the steps that firstly, the low-melting-point filler alloy is blended, 50% of bismuth, 13.3% of stannum, 26.7% of plumbum and 10% of cadmium are mixed, and the mixture is injected into the long-thin tube parts in the workblank state; secondly, after the filled low-melting-point alloy matter obtained in the step 1 is cooled, machining is conducted; and thirdly, the long-thin tube parts are placed in boiled water after being machined, the low-melting-point alloy can be melted and flow out, and the size of the parts is not affected.

Description

A kind of processing method of elongated pipe parts

Technical field

The invention belongs to field of machining, relate to a kind of processing method of elongated pipe parts.

Background technology

In field of machining, often can run into thin-wall long and thin tubing part, for certain type part, this part is 40CrNiMoA, hot rolling, the typical thin-wall long and thin tubing part of G50X4L=1430.As everyone knows, driller is afraid of deep hole, and major axis is afraid of in turner.Axial workpiece length-to-diameter is greater than 20, is called slender axles.The processing of thin and long shafts part is a more difficult process point, is the elongated pipe parts that wall thickness only has several millimeters still more.

In traditional processing mode, turner adopts the installation way on folder one top, and be hollow after chuck drives part to rotate in the middle of part, due to the insufficient rigidity of part self, the effect of turning over rear centrifugal force can start vibrations.Incessantly there is civilian phenomenon of shaking during turning, also there will be the phenomenon that wall thickness is seriously uneven.Also cannot ensure its wall thickness and appearance and size when grinder grinds final size after allowance, there will be time serious partly less than place.No small difficulty of processing is brought to the processing of part.

The invention provides processing method novel in, first, after the processing of this installation way, the axiality of inside and outside circle is higher, and wall thickness easily ensures; Secondly, be because grinding machine ensures the final size of part, the installation way of grinding machine is Double Tops point formula, is the error avoiding the disunity of lathe and grinding machine Set and Positioning mode to bring.Refinement coordinating and allowance relation between turner with grinder more in processing method.Finally ensure that part is high-quality to complete.

Summary of the invention

The technical problem to be solved in the present invention: the difficulty problem of traditional thin-walled elongated pipe parts processing.

Technical scheme of the present invention: a kind of processing method of elongated pipe parts, is characterized in that, comprises the following steps:

Step one, preparation low melting point filler alloys, after pressing Bi50%, Pb26.7%, Sn13.3%, Cd10% mixing by bismuth, tin, lead, cadmium four element, the fusing point of low melting point filler alloys is at 70-80 DEG C, and after cooling, cubical expansivity is little, injects under the green state of elongated pipe parts;

Step 2, after the low-melting alloy thing of filling in waiting step one cooling, processes, is first laemodipodiform by grinding machine rounding 5 place cylindrical approximate shape on elongated pipe parts, sees light, be convenient to turner frame centre frame, can reduce part and vibrate;

Step 3, be then grinder allowance 0.9MM during turner car External Shape, this turner terminates rear best timeliness a period of time, and at least 24 hours, last grinder was machined to final size;

Step 4, after machining, puts into boiling water by elongated pipe parts, and low-melting alloy can melt outflow, does not have an impact to accessory size.

Beneficial effect of the present invention: the present invention is by allocating special low melting point filler alloys, and ensure to add man-hour at thin-wall long and thin tubing part, rigidity obviously increases, and the deflection of part obviously reduces, size ratio is easier to ensure.Both improve production efficiency and product quality, also reduce scrappage.

Detailed description of the invention

Below method of the present invention is described.

Step one, preparation low melting point filler alloys, after pressing Bi50%, Pb26.7%, Sn13.3%, Cd10% mixing by bismuth, tin, lead, cadmium four element, the fusing point of low melting point filler alloys is at 70-80 DEG C, after cooling, cubical expansivity is little, injects under the green state of elongated pipe parts;

Step 2, after the low-melting alloy thing of filling in waiting step one cooling, processes, is first laemodipodiform by grinding machine rounding 5 place cylindrical approximate shape on elongated pipe parts, sees light, be convenient to turner frame centre frame, can reduce part and vibrate;

Step 3, be then grinder allowance 0.9MM during turner car External Shape, this turner terminates rear best timeliness a period of time, and at least 24 hours, last grinder was machined to final size;

Step 4, after machining, puts into boiling water by elongated pipe parts, and low-melting alloy can melt outflow, does not have an impact to accessory size.

Claims (1)

1. a processing method for elongated pipe parts, is characterized in that, comprises the following steps:

Step one, preparation low melting point filler alloys, after pressing Bi50%, Pb26.7%, Sn13.3%, Cd10% mixing by bismuth, tin, lead, cadmium four element, the fusing point of low melting point filler alloys is at 70-80 DEG C, after cooling, cubical expansivity is little, injects under the green state of elongated pipe parts;

Step 2, after the low-melting alloy thing of filling in waiting step one cooling, processes, is first laemodipodiform by grinding machine rounding 5 place cylindrical approximate shape on elongated pipe parts, sees light, be convenient to turner frame centre frame, can reduce part and vibrate;

Step 3, be then grinder allowance 0.9MM during turner car External Shape, this turner terminates rear best timeliness a period of time, and at least 24 hours, last grinder was machined to final size;

Step 4, after machining, puts into boiling water by elongated pipe parts, and low-melting alloy can melt outflow, does not have an impact to accessory size.