CN200984640Y - Full beat eccentric mould structure for improving product external diameter - Google Patents

Abstract

The utility model relates to an eccentric mold structure for improving product OD total runout, which comprises an external upper mold and an external lower mold, and is characterized in that the inner hole of the external lower mold is eccentric, the center of the inner hole is moved towards to the thicker region of the mold wall, in other words, the center of the inner hole is moved relatively to the high density region of the product, the center O of the inner hole of the product is displaced to high density region through the adjustment on a mold structure, so that the OD total runout difference resulting from an uneven rebounding can be effectively reduced.

Description

Improve the eccentric mould structure of product external diameter total run-out

Technical field

The utility model is a kind of eccentric mould structure that improves the total run-out of product external diameter, relates in particular to the mould that is used to make to the demanding metallic sintered products of external diameter total run-out.

Background technology

Axle journal is the strength member that is applied to automobile engine before the camshaft, and this part height height, external diameter have strict total run-out form and position tolerance, 0.20mm, 0.13mm (seeing Figure 1A and B).Adopt traditional mould structure, the problem of facing has three: 1, in camshaft front axle neck Mould design, manufacture process, because the special formed (see figure 1) of product, can only adopt the structure (seeing Fig. 2 A and 2B) on former band rank, but because cavity impression is complex-shaped, the step degree of depth is big, thereby its axiality is short of to some extent and (can only reaches 0.04～0.05mm); 2, the product neck be the abnormity, the wall thickness difference is very big, causes regional area to have density contrast inevitably, after the demoulding resilience inhomogeneous, differ maximum and reach 0.15～0.20mm; 3, necessary fit clearance between the mould, 0.01～0.02mm between interior counterdie and the outer counterdie, 0.02～0.03mm between outer counterdie and the former.Comprehensive above factor, adopt general traditional mould structure (to see Fig. 3-A, 4-A) the compacting products obtained therefrom obviously can't reach the total run-out requirement of the preceding axle journal external diameter of camshaft, total run-out as Φ 50.68mm place is 0.2～0.25mm, the total run-out at Φ 52.94mm place is 0.3～0.35mm, all overproof, can not satisfy the drawing requirement.

The utility model content:

The purpose of this utility model is to propose a kind of eccentric mould structure, by improving mould structure, improves metallic sintered products external diameter total run-out problem.

The purpose of this utility model realizes by following technical characterictic: described mould structure comprises: outer patrix and outer counterdie.

Outer counterdie endoporus off-centre: mind-set mold wall thicker part moves in the endoporus, promptly moves to the zone higher with respect to product density.

Outer patrix endoporus off-centre: move with the central synchronous of outer counterdie benchmark at the endoporus center.

Interior counterdie trim ring and interior down limit, modulus method hurdle cunning are joined, and fit clearance is 0.01～0.02mm, contingent lateral displacement when having limited interior counterdie compacting.

By adjustment to mould structure, the higher zone of mind-set density has reduced the irregular external diameter total run-out difference that causes of resilience partially effectively in the endoporus of product thereby make, the total run-out at Φ 50.68mm place is 0.05～0.10mm as previously mentioned, the total run-out at Φ 52.94mm place is 0.10～0.15mm, meets the drawing requirement fully.In this example, though be to be that example is described, should be appreciated that the utility model is applicable to the similar product that needs the total run-out of high requirement external diameter of structure with axle journal before the camshaft.

Description of drawings

The front view and the side view of axle journal product before Figure 1A and Figure 1B camshaft

The front view and the side view of Fig. 2 A and Fig. 2 B former die drawing

The common outer counterdie die drawing of Fig. 3-A

The outer counterdie die drawing of Fig. 3-B eccentric structure

The common upper die mold figure of Fig. 4-A

Fig. 4-B eccentric structure upper die mold figure

Embodiment

The utility model will be further described below in conjunction with accompanying drawing:

Referring to Fig. 3-B.Mold wall thicker part 31 (with respect to the higher zone of product density), mold wall thin location 32 (with respect to the lower zone of product density).Outer counterdie 3 endoporus off-centre: the endoporus center O is the middle mind-set mold wall thicker part 31 (with respect to the higher zone of product density) of benchmark A, mobile 0.07mm, and moving direction is by the center O of center O to mold wall thicker part radian ¹

See Fig. 4-B, as above in like manner, outer patrix 4 endoporus off-centre: the endoporus center O is the same with the central synchronous moving direction of outer counterdie benchmark A.

Interior counterdie trim ring and interior down limit, modulus method hurdle cunning are joined, and fit clearance is 0.01～0.02mm, contingent lateral displacement when having limited interior counterdie compacting.

Claims (2)

1, a kind of eccentric mould structure that improves the total run-out of product external diameter comprises: outer patrix and outer counterdie, it is characterized in that outer counterdie endoporus off-centre, and mind-set mold wall thicker part moves in the endoporus, promptly moves to the zone higher with respect to product density.

2, eccentric mould structure as claimed in claim 1 is characterized in that outer patrix endoporus off-centre, and move with the central synchronous of outer counterdie benchmark at the endoporus center.

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