CN104369618A - Vehicle wheel decoration cover - Google Patents

Abstract

A vehicle wheel decoration cover comprises a body, a plurality of large holes are formed in the edge of the body, each large hole is provided with a left edge, an inner edge, a right edge and an outer edge, and the left edge, the inner edge, the right edge and the right edge of each large hole are each 3+/-0.1 mm thick. The thickness of the body is 2.5+/-0.1 mm. Thus, the vehicle wheel decoration cover has the advantages that material thickness distribution is optimized, so that the confluence angle of fusant is large after the fusant flows through the square holes, no weld line is formed, appearance quality is guaranteed, and meanwhile mechanical strength is improved.

Description

Wheel disk

Technical field

The present invention relates to decorative cover for automobile wheel.

Background technology

As shown in Figure 1, wheel disk 1 is assemblied in outside the wheel hub of automobile, mainly plays decoration function.Its plastic basis material is generally PP+30%Talc.In order to increase metal-like to it, after injection mo(u)lding, need spraying silver powder polish lacquer.

As shown in Figure 3, wheel disk 1 comprises body 3, and body 3 edge is provided with some macropores 2, and macropore 2 has left hand edge 2, inward flange 22, right hand edge 23 and outward flange 24.Because wheel disk 1 is regular circle, common enter the mode of watering be single point needle-valve type hot flow path center, the back side and enter to water.As shown in Figure 2, enter to water from the glue position B that enters at wheel disk 1 center, flow towards periphery along arrow in figure and circle and spread.Therefore, the most easily there is weld bond at six macropore 2 places in this wheel disk 1, the most easily occurs body 3 place that the position A of weld bond is corresponding in the middle of macropore 2 outward flange 24.If weld bond is of poor quality, sprays paint and can amplify weld bond, become unacceptable apparent defect (participation Fig. 9).

For plastic parts, weld bond is common injection defect, and it is because the plastic melt fore-end from different directions is cooled, and fails to merge completely to produce in junction.Mainly in stowing operation, type intracavity gas can not be escaped rapidly from die joint or air discharge duct, finally forms tired gas at weld bond place and causes the acute angle of " V " connected in star to strengthen, and forms stress and concentrates, affect outward appearance and intensity.And for car trim, after major effect outward appearance, particularly application, electroplating technology, this defect can be exaggerated, more obviously.Time serious, product strength is had an impact, especially when mineral strengthen resin, particularly seriously.

For tabular goods, the quantity N of weld bond can be calculated as follows:

N＝n+m+1 (1-1)

N in formula-the cast gate number on same product

The core number of m-segmentation stream

In general, the weld bond of part can not be avoided completely, can only by adjustment injection molding process, enter to water position, presentation quality and mechanical strength that cast gate quantity, more conversion materials improve weld bond.Usual basis is converged form and is subdivided into following two kinds: Weld line (weld bond) and Meld line (weld junction) as shown in Figure 3, when product has a square hole, angle of converging after melt flows through square hole---macropore 2---is θ, when converging angle θ and being very little, for Weld line, when converging angle θ and being larger, be Meld line, converge angle θ relevant with material, design of part, gate location and quantity.What Fig. 4 showed Weld line and Meld line converges form.

Before improvement, this wheel disk 1 enters to water position, cast gate quantity without better scheme, and adjustable Shooting Technique window is also narrower, only has and converges situation by what change that the thick mode of material improves stream.The thick distribution situation of material of improvement front vehicle wheel cover of upholstery 1 as shown in Figure 5.As can be seen from the thick distribution of material, body 3 for 2.5mm material thick, the left hand edge 2 of macropore 2, inward flange 22 and right hand edge 23 for 2.5mm material thick, outward flange 24 is expected thick for 3mm, and locally (the body D at macropore left outside angle place and the body E at macropore right outside angle place) expects thick 4.4mm and 3mm.As shown in Fig. 7, Fig. 9, by with the thick distribution of material loading, expect, when the most easily occurring that the position A of weld bond converges, to converge angle θ angle less, occur weld bond, create unacceptable apparent defect.

For moulding, the solution of weld bond is comparatively stubborn problem always.Traditional mode is generally die trial part weld bond cannot meet requirements for quality, then take to change adjusting process parameter, gate location, amendment material thick, more the mode such as conversion materials rectify and improve, which increases cost of development and the cycle of part, will not recommend.

In order to solve above-mentioned deficiency of the prior art, the present invention proposes a kind of new solution.

Summary of the invention

The object of this invention is to provide one.

For reaching foregoing invention object, the technical solution adopted in the present invention is: provide a kind of wheel disk, comprise body, and body edges is provided with some macropores, it is characterized in that: it is 3 ± 0.1mm that described macropore has left hand edge, inward flange, right hand edge and outward flange.

Described body thickness is 2.5 ± 0.1mm.

The body thickness at macropore left outside angle place is 2.5 ± 0.1mm, and the body thickness at macropore right outside angle place is 2.5 ± 0.1mm.

In sum, the present invention by optimizing the thick distribution of material, after making melt flow through square hole to converge angle comparatively large, do not produce weld bond, and then ensure that presentation quality, improve mechanical strength simultaneously.

Accompanying drawing explanation

Fig. 1 is the structural representation of wheel disk 1;

Fig. 2 is that sizing material flows to schematic diagram at wheel disk 1 and the most easily occurs the position A schematic diagram of weld bond;

Fig. 3 is the partial enlarged drawing at C position in Fig. 1;

Fig. 4 be Weld line and Meld line converge form schematic diagram;

Fig. 5 is the thick distribution results figure of material optimizing front vehicle wheel cover of upholstery 1;

Fig. 6 is the thick distribution results figure of material optimizing rear wheel cover of upholstery 1;

Fig. 7 for optimize before fill result figure, show melt flow through macropore 2 after converge angle, this angle is less;

Fig. 8 for optimize after fill result figure, show melt flow through macropore 2 after converge angle, this angle is larger;

Fig. 9 is for optimizing front weld bond result figure;

In figure:

Wheel disk (1), macropore (2), left hand edge (21), inward flange (22), right hand edge (23), outward flange (24), (wheel disk) body (3),

The body (D) at the position (A) the most easily occurring weld bond, the position (C) entering partial enlargement in glue position (B), Fig. 1, macropore left outside angle place, the body (E) at macropore right outside angle place, (melt flow through square hole after) converge angle (θ).

detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.

As shown in Figures 1 to 3, this wheel disk 1, comprises body 3, body 3 edge is provided with some macropores 2, it is characterized in that: it is 3 ± 0.1mm that described macropore 2 has left hand edge 21, inward flange 22, right hand edge 23 and outward flange 24.

Described body 3 thickness is 2.5 ± 0.1mm.

The body D thickness at macropore left outside angle place is 2.5 ± 0.1mm, and the body E thickness at macropore right outside angle place is 2.5 ± 0.1mm.

As shown in Figure 6, optimizing the thick flange except macropore 3 of later material is except 3mm, and all the other main body 3 material are thick all adopts 2.5mm homocline thick, comprises the thickness of the body D at macropore left outside angle place and the body E at macropore right outside angle place.Left hand edge 21, inward flange 22, right hand edge 23 and outward flange 24 form the flange of macropore 3.

As shown in Figure 8, when pouring into a mould with the thick distribution of above-mentioned material, after melt flows through macropore 2 to converge angle θ larger.

As shown in Figure 10, what melt converged rear generation is Meld line (weld junction), but not Weld line (weld bond), and shorter.There is weld bond before solving optimization, create the problem of unacceptable apparent defect, also provide mechanical strength.Through die trial checking, also disposable successfully solution weld bond problem.About the defect of weld junction, cover after can realizing spraying paint, there is not appearance quality.

The present invention successfully solves weld bond problem by changing the thick distribution of wheel disk 1 material.In fact starting with from structure exactly, overcoming into watering position, cast gate quantity without better scheme, the difficulty that adjustable Shooting Technique window is also narrower; Also the problem once existed in traditional mode is avoided: being generally die trial part weld bond cannot meet requirements for quality, take again to change adjusting process parameter, gate location, amendment material thick, more the mode such as conversion materials rectify and improve, which increases the cost of development of part and the problem in cycle.

Although describe in detail the specific embodiment of the present invention by reference to the accompanying drawings, should not be construed as the restriction of the protection domain to this patent.In the scope described by claims, the various amendment that those skilled in the art can make without creative work and distortion still belong to the protection domain of this patent.

Claims (3)

1. wheel disk, comprise body (3), body (3) edge is provided with some macropores (2), it is characterized in that: it is 3 ± 0.1mm that described macropore (2) has left hand edge (21), inward flange (22), right hand edge (23) and outward flange (24).

2. wheel disk according to claim 1, is characterized in that: described body (3) thickness is 2.5 ± 0.1mm.

3. wheel disk according to claim 1 and 2, is characterized in that: body (D) thickness at macropore left outside angle place is 2.5 ± 0.1mm, and body (E) thickness at macropore right outside angle place is 2.5 ± 0.1mm.