CN204622482U

CN204622482U - A kind of engineering plastics cage injection mold

Info

Publication number: CN204622482U
Application number: CN201520250020.4U
Authority: CN
Inventors: 倪振国; 嵇和江; 许成德
Original assignee: DALIAN PUYANG RAILWAY LOCOMOTIVE VEHICLE ACCESSORIES Co Ltd
Current assignee: DALIAN PUYANG RAILWAY LOCOMOTIVE VEHICLE ACCESSORIES Co Ltd
Priority date: 2015-04-23
Filing date: 2015-04-23
Publication date: 2015-09-09
Anticipated expiration: 2025-04-23

Abstract

The utility model relates to a kind of engineering plastics cage injection mold, for railway truck bearing retainer, belongs to plastics injection mould field.Mould gate improves, comprise material die cavity, be presented on material the trapezoid cross section cast gate of die cavity front end face, with expect the section of hiding that die cavity side is contacted and the retainer installed with mould gate; Material is prismatoid structure die cavity, and at material formation trapezoid cross section, the front end face cross section cast gate of die cavity, the described section of hiding forms two sections of transition and to hide angle and two sections of draft angles, and gate form is excessive submarine; After designing two sections of excessive formula tunnel gates, mould gate is strong buffering when cutting off, and cuts off smooth and easy, cuts off face neatly smooth, and can reduce and cut off bad, that splashing cut by material defect, and second segment is hidden, correction and the remodeling of cast gate is convenient in the improvement of angle and size; Product weldless line, gas burn, fill and penetrate the problems such as line, flow liner, misrun, mold filling be bad.

Description

A kind of engineering plastics cage injection mold

Technical field

The utility model relates to a kind of engineering plastics cage injection mold, for railway truck bearing retainer, belongs to plastics injection mould field.

Background technology

Need plastics injection mould could carry out smoothly as aid when processing freight car bearing retainer, and most important to the selection of cast gate when using injection mold, because the design of cast gate directly affects the outward appearance of injection-molded item, distortion, molding shrinkage and intensity; If it is improper to select, easily makes injection-molded item produce to lack material, weld mark, shrinkage cavity, cast gate day shift, warpage, become fragile and the defect such as degraded.

At present, the cast gate of injection forming mold is generally divided into non-limiting cast gate and restricted cast gate two profiles formula, and the cast gate of plastics injection mould refers to the one section thin short runner connected between runner and die cavity, is the entrance of resin injection die cavity; Restricted cast gate is divided into again side gate, spot pouring mouth, sub marine gate and disc-annular shape cast gate etc.Impact is determined to the factor of gate location, comprise the shape of goods, size, wall thickness, dimensional accuracy, presentation quality and mechanical property etc.

For the rolling bearing engineering plastics cage adopting injection molding process processing, because product quality requires very strict, the size of its flexibility rotated, radial free movement directly affects the steady running of integral bearing, wherein the index request such as the internal soundness of what is more important product, mechanical performance, the matching of installing with bearing is higher, and therefore common gate design often cannot be satisfied the demand.Problems existing mainly contains: one is this mould gate residue problem, and residue impact and the matching of bearing of the runner section of excision automatically, cut off bad generation material and cut splashing, cause product cold burden; Two is adopt the engineering plastics cage product of glass fiber reinforcement, cause filling because mold filling is bad in injection moulding process penetrate line, flow liner is serious; Three is that easily to produce welding bad, and product exists obvious weld mark or directly occurs weld bond; Four is that product mechanical performance is lower, is difficult to the requirement that touches the mark; Five is that product mold filling is bad, and have the quality such as misrun, tired gas bad, thus directly cause bearing quality to decline, service life reduction, cannot ensure that stability and safety is run.

Summary of the invention

In view of the defect that above-mentioned technology exists, the purpose of this utility model is to provide a kind of engineering plastics cage injection mold, this mould designs pouring gate structure form, make mould gate smooth and easy when cutting off, can reduce and cut off bad, that splashing cut by material defect, correction and the remodeling of cast gate are convenient in the design of angle of hiding; Product product weldless line, gas burn, fill and penetrate the problems such as line, flow liner, misrun, mold filling be bad; Product mechanical performance also significantly improves, and meets the requirement of technical indicator better, ensure that the behavior in service of bearing integral, thus ensure that stable, the safety that railway freight-car runs.

To achieve these goals, the technical scheme that the utility model adopts is: a kind of engineering plastics cage injection mold, it is characterized in that: mould gate improves, comprise material die cavity, be presented on material the trapezoid cross section cast gate of die cavity front end face, with expect the section of hiding that die cavity side is contacted and the retainer installed with mould gate; Material is prismatoid structure die cavity, and at material formation trapezoid cross section, the front end face cross section cast gate of die cavity, the described section of hiding forms two sections of transition and to hide angle and two sections of draft angles, and gate form is excessive submarine; Mould gate is arranged on retainer product small end inner diameter on the surface, window beam is provided with between described retainer upper surface and lower surface, described mould gate horizontal direction is arranged on and departs from 4-7mm place, Chuan Liang center, and axial vertical direction is arranged on retainer product small end upper surface 3-5mm place.

Described trapezoid cross section cast gate is made up of suitable for reading, end opening and dual-side mouth; Two ends suitable for reading and Liang Cebiankou are respectively arc transition and are connected;

Described be suitable for readingly of a size of 2mm; Bottom size is 3mm; Be highly 2mm;

Two sections of described transition are hidden and are respectively 50 degree and 48 degree;

Two sections of described draft angles are respectively 20 degree and 14 degree;

The beneficial effects of the utility model are: after designing two sections of excessive formula tunnel gates, mould gate is strong buffering when cutting off, cut off smooth and easy, cut off face neatly smooth, can reduce and cut off bad, that splashing cut by material defect, and second segment is hidden, correction and the remodeling of cast gate is convenient in the improvement of angle and size; Product weldless line, gas burn, fill and penetrate the problems such as line, flow liner, misrun, mold filling be bad; Product mechanical performance also significantly improves, and meets the requirement of technical indicator better, ensure that the behavior in service of bearing integral, thus ensure that stable, the safety that railway freight-car runs.

Accompanying drawing explanation

Fig. 1 is that the utility model mould gate cuts off face shaped cross figure.

Fig. 2 is the utility model sub marine gate schematic diagram.

Fig. 3 is the sectional structure chart of the utility model mould gate and retainer installation site.

Fig. 4 is specific embodiment of the utility model schematic diagram.

Fig. 5 is the utility model mould gate and retainer mounting structure enlarged drawing.

In figure, 1, material die cavity, 2, trapezoid cross section cast gate, 3, the section of hiding, 4, retainer small end inner diameter, 5, retainer small end upper surface, 6, window beam, 7, suitable for reading, 8, end opening, 9, side mouth.

Detailed description of the invention

The utility model is described in detail as follows below in conjunction with specific embodiment:

A kind of engineering plastics cage injection mold, is characterized in that: mould gate improves, comprise material die cavity, be presented on material the trapezoid cross section cast gate of die cavity front end face, with expect the section of hiding that die cavity side is contacted and the retainer installed with mould gate; Material is prismatoid structure die cavity, and at material formation trapezoid cross section, the front end face cross section cast gate of die cavity, the described section of hiding forms two sections of transition and to hide angle and two sections of draft angles, and gate form is excessive submarine; Mould gate is arranged on retainer product small end inner diameter on the surface, window beam is provided with between described retainer upper surface and lower surface, described mould gate horizontal direction is arranged on and departs from 4-7mm place, Chuan Liang center, and axial vertical direction is arranged on retainer product small end upper surface 3-5mm place.

As shown in Figure 1, mould gate master cuts off face, its cross sectional shape is trapezoid cross section, and to be R angle excessive at upper side corners place, and the 2mm of being of a size of suitable for reading, bottom size are 3mm, highly are 2mm, this Cross section Design is conducive to the cut-out of sub marine gate, ensure to cut off smooth and easy, can not produce that to cut off mouth uneven, residual etc. bad, it also avoid the splashing producing and cut off material and cut, except ensure that product presentation quality while, it also avoid the waste product that product cold burden in injection moulding process causes.

As shown in Figure 2, gate form selects two sections of excessive sub marine gates, two sections of angles of excessively hiding are respectively 50 degree and 48 degree, two sections of drafting angles are respectively 20 degree and 14 degree, the meaning of this design is, strengthen the intensity that runner is hidden, reduce STRESS VARIATION when cutting off, be convenient to cast gate and cut off; Meanwhile, the requirements such as product adjust size, circularity, flow are also convenient in the design of second segment, facilitate design alteration, transformation.

As shown in Figure 3, at product small end inner diameter on the surface, horizontal direction departs from Chuan Liang center and is about 4-7mm place gate location design, and vertical direction is from small end upper surface 3-5mm place.The processing mode of its cast gate is also different from common cast gate electrode discharge processing mode, adopts advanced high accuracy five-shaft linkage numerical control machining center and high-precision numerical control LSWEDM machine tool to process.The setting of gate location, design according to the design feature of railway truck bearing engineering plastics cage, when this position can make stream mold filling initial, surge acts on the reinforcement of core, the i.e. part of shaping segment groove, this design can reduce fills injection pressure, avoids generation to fill and penetrates line, can not cause the defect of width surface irregularity at the bottom of product.Meanwhile, the route that stream pours die cavity is even by product window beam gently, and product window beam surface can be avoided to occur flow liner and glass line.The stable and uniform mold filling of overall stream, solves that mold filling is bad, the problem of misrun, tired gas, can ensure that product surface is smooth, even, full, ensure that the internal soundness of product is unified.

Claims

1. an engineering plastics cage injection mold, is characterized in that: mould gate improves, comprise material die cavity, be presented on material the trapezoid cross section cast gate of die cavity front end face, with expect the section of hiding that die cavity side is contacted and the retainer installed with mould gate; Material is prismatoid structure die cavity, and at material formation trapezoid cross section, the front end face cross section cast gate of die cavity, the described section of hiding forms two sections of transition and to hide angle and two sections of draft angles, and gate form is excessive submarine; Mould gate is arranged on retainer product small end inner diameter on the surface, window beam is provided with between described retainer upper surface and lower surface, described mould gate horizontal direction is arranged on and departs from 4-7mm place, Chuan Liang center, and axial vertical direction is arranged on retainer product small end upper surface 3-5mm place.

2. a kind of engineering plastics cage injection mold according to claim 1, is characterized in that described trapezoid cross section cast gate is made up of suitable for reading, end opening and dual-side mouth; Two ends suitable for reading and Liang Cebiankou are respectively arc transition and are connected.