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High pressure common rail pre-forging die

A high-pressure common rail and pre-forging technology, which is applied in the direction of manufacturing tools, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc. The end surface of the table is not easy to fill and other problems, achieving the effect of significant material locking function, reasonable control of product streamline direction, and saving raw materials

Inactive Publication Date: 2016-06-01
RIZHAO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, our company has developed a high-pressure common rail. This product has a complex structure. It is a slender rod body with eight bosses. Oxide skin is not easy to remove, and forging is difficult
According to the geometric characteristics of this type of product and the existing production technology conditions, our company has successively adopted a variety of technical methods such as improved billet making and pre-forging, but all of them were caused by insufficient filling of blanks due to deep grooves in parts of the mold. Difficult to meet design and use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]In this embodiment, the material used in the pre-forging die is boron-containing die steel. The chemical composition and mass percentage of the boron-containing die steel are: the content of C is 0.38wt%, the content of Cr is 8.8wt%, Si The content of Mn is 0.40wt%, the content of Mn is 0.75wt%, the content of Mo is 0.40wt%, the content of V is 0.20wt%, the content of Ni is 0.40wt%, the content of N is 0.012wt%, and the content of B is 0.25wt%, the content of P ≤ 0.030wt%, the content of S ≤ 0.025wt%, the balance is Fe and unavoidable impurities. The pre-forging die is subjected to the following heat treatment: the forging temperature of the forged pre-forging upper die and pre-forging lower die is rapidly cooled from not lower than 800°C to 500°C for 2.5 minutes; then the pre-forging upper die The die and the pre-forging lower die are placed in a heat treatment furnace and heated to 1050°C, and then kept for 2 hours; then the furnace is cooled to 850°C and kept for 2 ho...

Embodiment 2

[0032] In this embodiment, the material used in the pre-forging die is boron-containing die steel. The chemical composition and mass percentage of the boron-containing die steel are: the content of C is 0.42wt%, the content of Cr is 10.2wt%, Si The content of Mn is 0.35wt%, the content of Mn is 0.90wt%, the content of Mo is 0.35wt%, the content of V is 0.20wt%, the content of Ni is 0.35wt%, the content of N is 0.008wt%, and the content of B is 0.20wt%, the content of P≤0.030wt%, the content of S≤0.025wt%, the balance is Fe and unavoidable impurities. The pre-forging die is subjected to the following heat treatment: the forging temperature of the forged pre-forging upper die and pre-forging lower die is rapidly cooled from not lower than 800°C to 500°C for 2.5 minutes; then the pre-forging upper die The die and the pre-forging lower die are placed in a heat treatment furnace and heated to 1050°C, and then kept for 2 hours; then the furnace is cooled to 850°C and kept for 2 hour...

Embodiment 3

[0034] In this embodiment, the material used in the pre-forging die is boron-containing die steel. The chemical composition and mass percentage of the boron-containing die steel are: the content of C is 0.40wt%, the content of Cr is 9.5wt%, and the content of Si The content of Mn is 0.36wt%, the content of Mn is 0.87wt%, the content of Mo is 0.38wt%, the content of V is 0.23wt%, the content of Ni is 0.38wt%, the content of N is 0.010wt%, and the content of B is 0.22wt%, the content of P ≤ 0.030wt%, the content of S ≤ 0.025wt%, the balance is Fe and unavoidable impurities. The pre-forging die is subjected to the following heat treatment: the forging temperature of the forged pre-forging upper die and pre-forging lower die is rapidly cooled from not lower than 800°C to 500°C for 2.5 minutes; then the pre-forging upper die The die and the pre-forging lower die are placed in a heat treatment furnace and heated to 1050°C, and then kept for 2 hours; then the furnace is cooled to 850...

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Abstract

The invention relates to a high pressure common rail pre-forging die. The high pressure common rail pre-forging die consists of an upper pre-forging die and a lower pre-forging die, wherein cavities which are used for forming a rail body and multiple matching pipes are formed by match of the bottom surface of the upper pre-forging die and the upper surface of the lower pre-forging die, and the cavity of the rail body is mutually communicated with the cavity of the matching pipes; a material block convex plate is formed on the bottom surface of the upper pre-forging die, a material blocking groove which is matched with the material blocking convex plate is formed in the upper surface of the lower pre-forging die, and wear-resisting film layers are respectively formed on the material block convex plate and the material blocking groove. According to the high pressure common rail pre-forging die disclosed by the invention, the pre-forging die is not only lower in cost, but also is capable of fully utilizing the capacity of a blocking blank in a self locking way, and the defect rate of finished forge pieces is lower than 2500ppm which is far below the predicted average standard of 6000ppm in the same industry; the material utilization rate of a unit product is increased from 65%-72% to 78%-85%; the raw materials are saved, and the comprehensive technical economic effects of energy conservation and emission reduction are realized.

Description

technical field [0001] The invention relates to the technical field of engine accessories processing, more specifically, the invention relates to a high-pressure common rail pre-forging die used for automobile engines. Background technique [0002] The high-pressure common rail system has greatly improved the driving performance and emission performance of automobile engines. With the advancement of exhaust after-treatment technology and air-fuel ratio control technology, it is no longer at the expense of high thermal efficiency of the engine. It is very important for energy saving and environmental protection. has great significance. At present, the high-pressure common rail system has become one of the core technologies in the field of engines in the automotive industry. In our country, we have begun to break the technological monopoly of foreign countries, and gradually formed an independent core technology system. [0003] In a common-rail engine, a pipe called a commo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J13/02C22C38/54C21D9/00C21D1/18
Inventor 许崇霞冯德军雷跃峰
Owner RIZHAO POLYTECHNIC