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A full-fiber forming method for a crankshaft for a vehicle

A full-fiber, crankshaft technology, used in mechanical equipment, engine components, manufacturing tools, etc., can solve the problems of high cost and operation requirements, many crankshaft heating times, and high tooling requirements, achieving good internal organization quality and low material utilization. , good mechanical properties

Active Publication Date: 2016-04-27
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional hot die forging method is generally suitable for small crankshafts. First, the bar is upset to make a billet, and then the shape of the crankshaft is finally formed through pre-forging and final forging. Large force, many heating times of the whole crankshaft, complex flashing, high tooling requirements
The bending and upsetting method is also formed one by one, but after the forming is completed, it is necessary to add a twisting process to twist the bending to the required angle. There are also new processes that integrate a special angle indexing device in the equipment, which can be used during forming. Rotate the tooling as needed to achieve the wrong turning angle of the crankshaft, but this requires high precision equipment and requires an independent special device, which requires high cost and operation

Method used

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  • A full-fiber forming method for a crankshaft for a vehicle
  • A full-fiber forming method for a crankshaft for a vehicle
  • A full-fiber forming method for a crankshaft for a vehicle

Examples

Experimental program
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Embodiment 1

[0033] Such as figure 1 As shown, a full-fiber forming method of a PD150-6 vehicle crankshaft comprises the following steps:

[0034] 1. Change the diameter Turning of 40CrMo round steel bars into prefabricated blanks with stepped shafts, such as figure 2 shown;

[0035] 2, the blank of prefabricating the 1st crank throw in the blank is heated to 1150 ° in the split heating furnace, and it is kept warm for 20min;

[0036] The forging temperature is 1150° when the round steel bar stock used in this embodiment is heated

[0037] 3. Put the prefabricated blank of the first crank throw into the crank throw mold, then put the mold into the full fiber upsetting equipment, clamp both ends of the prefabricated blank at the same time, and complete the bending and extrusion forming in one process at the same time. After the shaping of the 1st bell crank, put into air cooling. The I crankshaft after forming is as image 3 shown.

[0038] 4. Rotate the positioning mold 120 degree...

Embodiment 2

[0047] Such as Figure 6 As shown, a full fiber forming method of a PD250-8 vehicle crankshaft comprises the following steps:

[0048] 1. Change the diameter Turning of 40CrMoA round steel bars into prefabricated blanks with stepped shafts;

[0049] 2, the blank of prefabricating the 1st crank throw in the blank is heated to 1200 ° in the split heating furnace, and it is kept warm for 20min;

[0050] The forging temperature of the round steel bar selected in this embodiment is 1200° when heated.

[0051] 3. Put the prefabricated blank of the first crank throw into the crank throw mold, then put the mold into the full-fiber upsetting equipment, clamp both ends of the precast blank at the same time, and complete the bending and extrusion forming in one process at the same time. After the shaping of the 1st bell crank, put into air cooling.

[0052] 4. Rotate the positioning mold by 90 degrees, and insert the buckle on the mold base into the slot. ;

[0053] 5. Heat the bl...

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Abstract

The invention belongs to the technical field of precision plastic forming and discloses a full-fiber forming method for an automotive crankshaft. According to the full-fiber forming method, a bellcrank portion of the crankshaft is formed through sequential and gradual turning, firstly, a round steel bar with the needed size is turned into a preformed billet with a step shaft, the first bellcrank billet is placed into a folio type heating furnace to be heated, then the first bellcrank billet is placed in a crankshaft mould, full-fiber upsetting equipment is adopted to complete upset-extruding and bending of bellcranks at one step, then the first bellcrank billet is taken out, the mould is replaced, and the above steps are repeated to complete all bellcranks of the whole crankshaft. According to the full-fiber forming method for the automotive crankshaft, crankshaft forge pieces can be continuous in flow line, the interior quality of the crankshaft forge pieces is good, the product performance can be improved greatly, the product material utilization rate is high, the working procedures are easy and convenient, and production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of precision plastic forming, in particular to a full-fiber forming method of a crankshaft for a vehicle. Background technique [0002] The crankshaft for a vehicle is one of the key components of the vehicle engine. Its main function is to convert the thrust from the connecting rod into torque and output work as power. Inertial force, additional stress generated by vibration, etc. Therefore, the crankshaft is required to have good comprehensive mechanical properties such as high strength, rigidity, wear resistance, fatigue resistance, and impact resistance. During the forging process, it is necessary to ensure that the internal and surface defects of the crankshaft are less, the structure is reasonable, the flow direction of metal fibers is good, and the shape and size are accurate. [0003] At present, the commonly used manufacturing methods for misaligned crankshafts are traditional hot die forging metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/08B21J13/02
Inventor 康凤陈强舒大禹赵强肖远伦胡传凯
Owner NO 59 RES INST OF CHINA ORDNANCE IND