CN202123216U

CN202123216U - Casting mould for casting thin and deep hole

Info

Publication number: CN202123216U
Application number: CN2011201525032U
Authority: CN
Inventors: 陆寅鹏
Original assignee: WUXI LITTLE SWAN PRECISION CASTING CO Ltd
Current assignee: Jiangsu Lingte Fine Machinery Co., Ltd.
Priority date: 2011-05-13
Filing date: 2011-05-13
Publication date: 2012-01-25
Anticipated expiration: 2021-05-13

Abstract

The utility model aims at providing a casting mould for casting a thin and deep hole to solve the technical problems that the existing casting method is complex in technology, unstable to fasten a mud core, hard to guarantee the quality and the like. The casting mould is firstly designed with a proper mud core head and adopts a beveling mode to be good for combining an external mould with the sand after the sand is put into the external mould so as to obtain a pre-embedded mud core; the pre-embedded mud core is put into a hole of the external mould, and a plurality of gaps are previously remained at the periphery and the bottom of a mould of the hole of the external mould, so that the mould is conveniently drawn (the mould drawing resistance is reduced), and the sand is putted and filled into the mould; and the mould is withdrawn after casting, so that the pre-embedded mud core is combined with the external shape to be taken as the casting mould. The casting mould is normalized in shape and free of breakage after the mould is drawn, free of sand compensating and mold repairing, free of a core suspending working procedure, and free of a fash on the cast product since a self-contained part is combined with a shape.

Description

A kind of casting mold that is used for thin deep hole moulding

Technical field

The utility model relates to a kind of casting mold that is used for thin deep hole moulding, so that casting obtains carrying the foundry goods of thin deep hole.

Background technology

At present the formative method to thin deep hole has two kinds: a kind of is that nature is taken out of, adds the cover of opposite opened for the big thin deep hole model of diameter, when H/D >=1.5; Even if take the way of pre-buried arbor in the hole, sand mold is often damaged in the molding metapore, and the stop-off workload is big; Geometry is irregular; When one group of deep hole, it is big, not easy to operate to put sand back-up sand difficulty.The 2nd, top adds core print, and core is done and portalled under the knockout, and the method is the mud core fixedly, fastening not firm, the mud core skewness of mud core often occurs, complex operation, and workload is big, and quality is difficult for guaranteeing.

The utility model content

The utility model aims to provide a kind of casting mold that is used for thin deep hole moulding, with solve existing formative method complex process, mud core fastening not firm, technical problem such as be difficult to ensure the quality of products.

The technical scheme of the utility model is following:

A kind of phenolic sand molding method of pre-buried mud core may further comprise the steps:

(1) according to the shape and size of thin deep hole, design the mud core, this mud core comprises mud core print and mud core core body, and wherein the mud core head of mud core is divided into down oblique formula;

(2) according to the design of mud core, produce corresponding mud core box, obtain the mud core thereby make;

(3) get a moulding external mold, this moulding outer mold has in order to the external mold of placing said mud core from holes; The mud core that step (2) is made is overlapped in said external mold from holes, and promptly the mud core print of mud core partly is overlapped in external mold from upper edge with holes, and the core body of mud core partly stretches into external mold in holes and leave the gap;

(4) mud core and moulding external mold are carried out moulded, put sand, back-up sand;

(5) molding; Molding obtains external form and the mud core is combined as a whole, promptly as the casting mold that is used for thin deep hole moulding.

Resin sand is all adopted in put sand, back-up sand in mud core in the above-mentioned steps (2) and the step (4).

The bevelling of above-mentioned mud core print is 10 °～15 °.

If the upper bottom surface diameter of mud core print is M; The bottom surface diameter of mud core print is N, and the diameter D of then above-mentioned mud core core body is

The external mold of the moulding external mold in the above-mentioned steps (3) from holes be cylindrical hole or stepped hole.

The external mold of the moulding external mold in the above-mentioned steps (3) is from preferred cylindrical hole with holes, and the gap between this cylindrical hole and the mud core core body is 1mm-5mm.

Moulding external mold in the above-mentioned steps (3) can be wooden, also can be materials such as aluminum.

A kind of casting mold that is used for thin deep hole moulding that obtains according to above-mentioned phenolic sand molding method; Comprise pre-buried mud core and external form, said pre-buried mud core is divided into mud core print and mud core core body two parts, wherein; The mud core head is divided into down oblique formula, and external form has and the suitable recess of mud core print outer profile size; The mud core print fills in the recess of external form, and combines closely with external form.

Above-mentioned pre-buried mud core and external form all adopt resin sand, and the two natural combination is an one.

The bevelling of above-mentioned mud core print is 10 °～15 °.

The utlity model has following advantage:

1, shape is regular after the molding, nothing is damaged, does not need stop-off, repaiies type, saves the suspended core operation, is combined as a whole from band portion and profile, and foundry goods does not have fash.

2, saving of work and time is raised labour productivity, and has guaranteed to have improved the visual quality of casting from profile geometries with holes, has improved foundry goods from dimensional accuracy with holes.

Description of drawings

Fig. 1 obtains having the foundry goods sketch map of thin deep hole for the utility model expectation;

Fig. 2 is the pre-buried mud core sketch map of the utility model;

The external mold that Fig. 3 is overlapped in the moulding external mold for mud core in the utility model formative method is from sketch map with holes;

The sketch map of the casting mold that Fig. 4 prepares for the utility model formative method.

The drawing reference numeral explanation:

The 1-foundry goods, the pre-buried mud core of 2-, 21-mud core print, 22-mud core core body, 3-moulding external mold, 4-casting mold.

The specific embodiment

Under the prerequisite of the utility model modular invariance outside moulding; Manufacture pre-buried mud core box separately, the mud core of accomplishing fluently curing is placed in the outer nib, put molding after sand, the back-up sand; Because there is the gap in pre-buried mud core with outer nib; Casting mold is complete from band portion, not damaged after the molding, again mud core and external mold is cured as one simultaneously, need not fastening again mud core.Thereby realized that casting mold is intact, damaged few, planed joint is smooth, and size is accurate, is not prone to during cast that the mud core tilts, skew, does not have the characteristics of core print fash, the saving of labor, saves time, and has improved the visual quality of casting.

Concrete operations are:

The phenolic sand molding method of pre-buried mud core may further comprise the steps:

(1) according to the shape and size of thin deep hole, design the mud core, this mud core comprises mud core print and mud core core body, and wherein the mud core head of mud core is divided into down oblique formula, and the bevelling of mud core print is 10 °～15 °;

(5) molding; Molding obtains external form and the mud core is combined as a whole, and promptly as the casting mold that is used for thin deep hole moulding, will form in order to casting and carry thin deep hole foundry goods.

The external mold of the moulding external mold in the above-mentioned steps (3) is from preferred cylindrical hole with holes, and through test, this cylindrical gap between with holes and mud core core body is that 1mm-5mm is comparatively suitable, so that molding (reducing the resistance of molding).The moulding external mold can be wooden, also can be materials such as aluminum.

The application example contrast:

Certain 1001W type injection machine two plate, the about 9000Kg of foundry goods substance, material QT450-10, bottom wall thickness 320mm belongs to thick large ball games ironware, and 8 of two groups of Φ, 80 * 200 deep holes are arranged at the bottom.

If adopt to carry (movable aluminium cover in the die hole) and produce, well damage after the molding, it is very big to repair type stop-off workload, and is difficult for guaranteeing the outward appearance geometry.

If adopt core mode down, because be suspended core, reserve 8 of suspended core screw holes, and the suspended core workload be big; Careless manipulation is arranged slightly, can make cylindrical core be broken into cracking, occur tilting or displacement after crossing loose mud core pouring molten iron such as tension, foundry goods top since down core have feather.

Adopt the pre-buried cylinder mud of the utility model core production technology, shape is regular after the molding, nothing is damaged, does not need stop-off, repaiies type, saves the suspended core operation, is combined as a whole from band portion and profile, and foundry goods does not have fash.Saving of work and time is raised labour productivity, and has guaranteed to have improved the visual quality of casting from profile geometries with holes, has improved the dimensional accuracy of cylindrical hole.

Through experiment, on the product of other type, apply all very success, this method is simple, can be widely used in the thin deep hole production in the self-hardening sand foundry goods, than method of carrying and following core method obvious effects is arranged.

Claims

1. casting mold that is used for thin deep hole moulding; It is characterized in that: comprise pre-buried mud core and external form, said pre-buried mud core is divided into mud core print and mud core core body two parts, wherein; The mud core head is divided into down oblique formula, and external form has and the suitable recess of mud core print outer profile size; The mud core print fills in the recess of external form, and combines closely with external form.

2. the casting mold that is used for thin deep hole moulding according to claim 1 is characterized in that: said pre-buried mud core and external form all adopt resin sand, and the two natural combination is an one.

3. the casting mold that is used for thin deep hole moulding according to claim 2 is characterized in that: the bevelling of said mud core print is 10 °～15 °.

4. the casting mold that is used for thin deep hole moulding according to claim 3; It is characterized in that: the upper bottom surface diameter of establishing the mud core print is M; The bottom surface diameter of mud core print is N, the diameter of then said mud core core body