CN102873254A - Forging process for lifting axle head - Google Patents

Abstract

The invention discloses a forging process for a lifting axle head. The forging process specifically comprises the following steps: (1), designing a drawing of an integral forged piece blank comprising a brake bracket and an axle head according to the drawing size of a product, defining the material trademark as 40MnBH; (2), determining blanking dimension of a round steel according to the integral forged piece blank drawing, and blanking to achieve round steel sections; (3), heating up the round steel sections to 1100 to1180 DEG C; (4), carrying out vertical forging on a forging machine, so as to form a forged piece blank of the lifting axle head; and (5), removing the overlapped edge of the forged piece blank of the lifting axle head. According to the invention, the lifting axle head structure is improved and designed to be an integral forging structure, so that the material consumption for integral forging is saved by 10-15% through forging and integral forming in comparison with an existing split structure; moreover, due to the forged piece, the tensile strength of the product is improved, so that the axle head is not broken because of the quality hidden trouble in welding to cause an accident when a finished automobile runs.

Description

The process for forging of lift bridge spindle nose

Technical field

The present invention relates to the technological method for processing of lift bridge spindle nose, especially process for forging.

Background technology

Existing lift bridge spindle nose, design are to adopt split bond pads structure, by Fig. 1, brake support frame 1 shown in Figure 2 and spindle nose 2 shown in Figure 3 process respectively assemble after, be welded by gas shielded arc welding again, as shown in Figure 4.Make through follow-up machine finishing again.This product is the important security part of automotive axle, if design unreasonablely, not only causes the manufacturing cost of parts also can affect the service life of automobile axle, and more important meeting brings the potential safety hazard of vehicle traveling process.Show from whole requirement of this product technology; One, the whole material of parts is 40MnB; Two, heat treatment quenching and tempering is HB257～295; Three, 100% harmless crack-detecting; Four tensile strength are 858～987N/mm2.

Specification requirement according to this product; divide whole bond pads structure because by gas protection weldering welding; not only can have bead crack, be mingled with, pore, etc. defective; the tensile strength of commissure does not guarantee fully yet and in a single day this product has very large technique to drop in the mass production process; not only caused production and the purchase cost of this product, the more important thing is that product has very large hidden danger of quality.

Summary of the invention

Have the problem of weld defect for fear of existing lift bridge spindle nose, improve the quality of products, reduce the process costs of product, the present invention proposes the process for forging of lift bridge spindle nose.

For this reason, technical scheme of the present invention is: the process for forging of lift bridge spindle nose, concrete steps are as follows: (1). and according to the figure paper size of product, design the solid forging blank drawing that comprises that brake support frame and spindle nose form, the definition material trademark is 40MnBH;

(2). the dimensional parameters according in the solid forging blank drawing, calculate volume, determine the round steel blank size; Then blanking is the round steel section;

(3). the round steel section is heated to 1100～1180 ℃;

(4). then, carry out vertical forging at forging machine: adopting round steel, is lift bridge spindle nose forging blank through blocking, finish-forging direct forming;

(5). remove the overlap of lift bridge spindle nose forging blank.

The lift bridge spindle nose forging blank after being shaped, through being machined to final size.

Beneficial effect: because the present invention has improved the lift bridge shaft head structure, be designed to the solid forging structure, by forging monolithic molding, the existing split-type structural economical with materials of whole forging material consumption rate material is saved 10-15%.And, owing to be forging, the processing performance of product there has been sufficient guarantee, improved the tensile strength of product, when move, car load can spindle nose be ruptured do not cause security incident because welding produces hidden danger of quality.

Description of drawings

Fig. 1 is the structure chart of brake support frame in the existing lift bridge spindle nose.

Fig. 2 is along the A-A cutaway view among Fig. 1.

Fig. 3 is the structure chart of spindle nose in the existing lift bridge spindle nose.

Fig. 4 is the structure chart of existing lift bridge spindle nose.

Fig. 5 is the structure chart of a kind of lift bridge spindle nose among the present invention.

The specific embodiment

As shown in Figure 5, be a kind of structure chart of lift bridge spindle nose among the present invention.According to the overall structure of this lift bridge spindle nose 3, it is as follows to describe its process for forging:

(1). according to the figure paper size of product, design the solid forging blank drawing that comprises that brake support frame 3a and spindle nose 3b form, the definition material trademark is 40MnBH;

(2). the dimensional parameters according in the solid forging blank drawing, calculate volume, determine the round steel blank size; Then blanking is the round steel section;

(3). the round steel section is heated to 1100～1180 ℃;

(4). then, carry out vertical forging at forging machine: adopting round steel, is lift bridge spindle nose forging blank through blocking, finish-forging direct forming; What described blocking adopted is open, and described finish-forging is to adopt die-forging forming.

The lift bridge spindle nose forging blank after being shaped, according to the dimensional parameters requirement, through being machined to final size.

Claims (1)

1. the process for forging of lift bridge spindle nose, concrete steps are as follows: (1). and according to the figure paper size of product, design the solid forging blank drawing that comprises that brake support frame and spindle nose form, the definition material trademark is 40MnBH;

(2). the dimensional parameters according in the solid forging blank drawing, calculate volume, determine the round steel blank size; Then blanking is the round steel section;

(3). the round steel section is heated to 1100～1180 ℃;

(4). then, carry out vertical forging at forging machine: adopting round steel, is lift bridge spindle nose forging blank through blocking, finish-forging direct forming;

(5). remove the overlap of lift bridge spindle nose forging blank.

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