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Preparation method of bucket tooth

A bucket tooth and tooth tip technology, applied in the field of bucket tooth preparation, can solve the problems of reduced impact toughness, easy occurrence of brittle fracture, growth of austenite grains, etc., and achieves reduced heating temperature, good wear resistance, high The effect of impact toughness

Active Publication Date: 2019-01-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the use of higher heating temperature (initial forging temperature) in the prior art can make the tip of the tooth reach a suitable quenching temperature, thereby obtaining higher hardness and wear resistance, but at the same time it will inevitably cause the root of the tooth to be at the bottom for a long time. High-temperature state makes austenite grains grow, impact toughness decreases, and brittle fracture is prone to occur

Method used

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preparation example Construction

[0020] The preparation method of the forged bucket tooth of the present invention comprises the following steps:

[0021] 1) Heating the bar to 900-1000°C, and then hot-extruding to obtain the bucket tooth forging billet;

[0022] 2) reheating the tooth tip of the bucket tooth forging billet obtained in step 1) and making the temperature of the tooth tip the same as that of other parts;

[0023] 3) Quenching the bucket tooth forging blank as a whole after reheating in step 2).

[0024] The bucket tooth of the present invention is a bucket tooth for an excavator.

[0025] The forging billet in step 1) is obtained by a method comprising the following steps: after heating the bar to 900-1000°C, extruding one end of the bar to reach a set taper to obtain a billet, hot extrusion forming the billet, and then writing off Hole and embossing to get the bucket tooth forging billet. The bucket tooth forging billet has tooth tips. The bar material is 30CrMnSi steel or 35CrMo.

[0026...

Embodiment 1

[0036] The preparation method of the forged bucket tooth of the present embodiment comprises the following steps:

[0037] 1) Material selection and cutting. 30CrMnSi round steel with a diameter of 70mm is selected, and the round steel is cut into a 350mm bar by a shearing machine.

[0038] 2) Bar heating. The bars were heated to 900°C using a medium frequency induction tube furnace.

[0039] 3) Forged tip. Using a 160t open fixed table press, extrude one end of the heated bar into an end with a set taper to obtain a billet. The set taper can be set according to the specific design shape of the bucket tooth to be prepared. The forging time is within 5s.

[0040] 4) Die forging. The billet prepared in step 3) is placed in the lower mold cavity of the hot forging die, and the billet is hot-extruded by a 1600t friction press to obtain a bucket tooth billet. Because the forging time is very short (within 5s), the hot extrusion temperature is about 900°C.

[0041] 5) Punchi...

Embodiment 2

[0048] The preparation method of the forged bucket tooth of the present embodiment comprises the following steps:

[0049] 1) Material selection and cutting. 35CrMo round steel with a diameter of 80mm is selected, and the round steel is cut into a 400mm bar by a shearing machine.

[0050] 2) Bar heating. The bars were heated to 950 °C using a medium frequency induction tube furnace.

[0051] 3) Forged tip. Using a 160t open fixed table press, extrude one end of the heated bar into an end with a set taper to obtain a billet. The set taper can be set according to the specific design shape of the bucket tooth to be prepared. The forging time is within 5s.

[0052] 4) Die forging. The billet prepared in step 3) is placed in the lower mold cavity of the hot forging die, and the billet is hot-extruded by a 1600t friction press to obtain a bucket tooth billet. Because the forging time is very short (within 5s), the hot extrusion temperature is about 950°C.

[0053] 5) Punchin...

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PUM

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Abstract

The invention relates to a preparation method of a bucket tooth and belongs to the technical field of forging. The preparation method of the bucket tooth comprises the following steps: 1) heating a bar material to 900 to 1000 DEG C, and performing hot extrusion molding and offset impressing to obtain a bucket tooth forging blank; 2) reheating a tooth tip part of the bucket tooth forging blank obtained in the step 1) to enable the temperature of the tooth tip part to be as same as that of other parts; and 3) performing integrated quenching treatment on the reheated bucket tooth forging blank inthe step 2) by using the forging afterheat. According to the preparation method of the bucket tooth, the bar material is heated to low initial forging temperature, and the time that the bucket toothroot part is at high temperature when the bucket tooth forging blank is quenched by the forging afterheat can be shortened, so that the phenomena that coarse grains occur on the bucket tooth root partafter quenching and the impact toughness is reduced are avoided; and the tooth tip part of the forging blank is reheated, so that the phenomena that the hardness is slightly low and the wear resistance is reduced caused by low tooth tip quenching temperature caused by low forging temperature are avoided.

Description

technical field [0001] The invention relates to a method for preparing bucket teeth, which belongs to the technical field of forging. Background technique [0002] The bucket teeth on the excavator are vulnerable parts. When working, they are directly in contact with sand, gravel, soil, etc., and are subjected to strong impact, extrusion, bending moments, etc., which can easily cause excessive wear of the tooth tip, and tooth roots (especially pins) hole parts) fracture and other failure behaviors. Therefore, the tooth tips of the bucket teeth should have higher hardness and wear resistance, while the tooth roots should have better strength and toughness. [0003] In the existing preparation process of forged bucket teeth, the heating temperature adopted is relatively high. For example, the Chinese invention patent application with the application publication number CN104259750A discloses a forging process for bucket teeth, and the heating temperature for the blank is 1100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J1/06C21D1/18
CPCB21J1/06B21J5/002C21D1/18
Inventor 任凤章王宇飞张少鹏李腾飞李修召张冠峰马战红熊毅
Owner HENAN UNIV OF SCI & TECH