CN203477249U - Green structure of staggered-tooth powder metallurgy chain wheel - Google Patents

Disclosed is a green structure of a staggered-tooth powder metallurgy chain wheel. The green structure comprises a green body with an upper row of teeth and a lower row of green teeth on two sides and is characterized in that an auxiliary structure facilitating forming of the green body is arranged on the portion, in the middle of the green body, between the upper row of teeth and the lower row of teeth. Green of the chain wheel is designed again, the auxiliary structure facilitating forming of the green body is arranged on the portion, in the middle of the green body, between the upper row of teeth and the lower row of teeth, and therefore a product is substantially symmetric in vertical structure, the technical problems that ordinary single female mold forming can not meet design requirements for parts originally and staggered teeth can not be achieved are solved, the integrated chain wheel with the two rows of teeth with different numbers can be formed through a single ordinary female mold, production cost is reduced, and production efficiency is improved.

A kind of green structure of side set powder metallurgy chain wheel

Technical field

The utility model relates to a kind of green structure of side set powder metallurgy chain wheel.

Background technique

Along with the rapid growth of China's economic, make living standards of the people start to march toward well-to-do level.After household electric appliance are fully universal, the emphasis of consumption of resident will turn to house and the automobile of wholesale.Under this propensity to consume, automobile industry, at last year and the beginning of this year, has kept quite high growth rate just.And this propensity to consume, certainly also will accelerate to continue at a few years from now on, this has established extraordinary basis for the development of automobile industry.

The development of automotive industry, must drive the development of relevant industries.Powder metallurgy is exactly that wherein one it is advantageous that powder metallurgy process can be pressed into the pressed compact of final size, and does not need or seldom need machining subsequently, therefore can greatly save metal, reduces product cost.Some developed countries of North America, the content of metallic sintered products in each automobile is 20Kg nearly, but domestic generally in 10Kg, and visible potentiality are also very large.In a lot of situations, metallic sintered products can substitute former machined piece completely at aspect of performance, but because current domestic forming technique is inadequate, can not single forming out.

Double side set sprocket wheel is exactly good example, and this part, in motor car engine, can play lightweight, space-saving effect.This series products was all to use forging in the past, then machining completes, and this just makes processing cost very high, and processing speed is slow.If adopt normal powder metallurgy to produce, because two rows tooth size is close, cannot in a former, complete, must adopt separated former or jack to jack adapter mold forming technology.But the mould of jack to jack adapter mould or separated female mould forming technology is complicated, and needs special, expensive.Therefore, adopt common single female mould forming, though can reduce production costs, be still difficult to meet the designing requirement of part, cannot realize the production of side set.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of green structure that adopts single female mould forming side set powder metallurgy chain wheel for the above-mentioned state of the art.

The utility model solves the problems of the technologies described above adopted technological scheme: a kind of green structure of side set powder metallurgy chain wheel, comprise that both sides are provided with the base substrate of two rows tooth, is characterized in that: between the middle part of described base substrate, two rows tooth, be provided with the supplementary structure of being convenient to blank forming.

As improvement, described supplementary structure is square, circle or polygonal.

Finally, the diameter of described supplementary structure or the length of side are greater than the external diameter of toothrow.

Compared with prior art, the utility model has the advantage of: the green compact that redesigned sprocket wheel, between the middle part of base substrate, two rows tooth, be provided with the supplementary structure of being convenient to blank forming, make the up-down structure almost symmetry of product, solve preferably the common single female mould forming of original employing and be difficult to meet the designing requirement of part, cannot realize the technical problem of side set, made the conjuncted sprocket wheel of the double different numbers of teeth can common single female mould forming, reduce cost of production, improved manufacturing efficiency.

Accompanying drawing explanation

Fig. 1 is the structural representation of embodiment 1 side set powder metallurgy chain wheel green compact;

Fig. 2 is the structural representation of side set powder metallurgy chain wheel;

Fig. 3 is the side view of Fig. 1;

Fig. 4 is the model configuration figure of the side set powder metallurgy chain wheel green compact in Fig. 1;

Fig. 5 is the structural representation for the production of the mould of the side set powder metallurgy chain wheel green compact in Fig. 3;

Fig. 7 is the structural representation of mould of embodiment 3 side set powder metallurgy chain wheel green compact.

Embodiment

Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.

Embodiment 1

Embodiment 3

Below specific design process is described in detail:

1, upper lower tooth is of a size of Fig. 2, according to digital-to-analogue green compact, is that Fig. 1 determines upper/lower die inner cavity size.

2, according to the density requirements of product, and the compressibility of iron powder, calculate total briquetting pressure, with this, select press.

3, the life-span of green compact external diameter and mould relevant, as Fig. 4 mould general configuration, when product is being shaped, its inner chamber is all full of iron powder, iron powder is to all pressure testings of all directions, so can think that the pressure of its inner chamber is exactly that unit pressure is multiplied by compression area.Then determine die material, use FEA to analyze, progressively strengthen outside dimension, when safety coefficient is more than or equal to 1.2, illustrate that the intensity of mould is enough, then external diameter now, just can be decided to be the external diameter that green compact design.