CN110026530A

CN110026530A - Model used for casting draft method

Info

Publication number: CN110026530A
Application number: CN201910463173.XA
Authority: CN
Inventors: 马广华; 吕芳遂; 于祥增
Original assignee: DALIAN JINHE CASTING CO LTD
Current assignee: DALIAN JINHE CASTING CO LTD
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2019-07-19
Anticipated expiration: 2039-05-30
Also published as: CN110026530B

Abstract

The invention belongs to casting technology fields, and in particular to a kind of model used for casting draft method adheres to one layer of spacer in the outer surface of model, model is put into sandbox together with spacer, model is extracted after sand washing sizing, after the completion of draft, the spacer stayed on sand mold is separated with sand mold.Draft method provided by the invention, can be smaller in model pattern draft, or requires without pattern draft, model be embedded in sand it is relatively deep, can not molding when, be smoothly detached model with sand mold.

Description

Model used for casting draft method

Technical field

The invention belongs to casting technology fields, and in particular to a kind of model used for casting draft method.

Background technique

Usually in casting process, first model is put into sandbox, sand washing, sand mold is formed, then by model from sand mold It takes out, i.e. draft process.In general, in order to make model be easy to extract, model can generally make wedge shape wide at the top and narrow at the bottom, be allowed to With certain pattern draft, when draft, model and sand mold only have in a flash frictional force what is most started, as long as model pulls out A small distance out, the outer wall of model and the inner wall of sand mold will separate.However in actual production, since product or technique are wanted It asks, the pattern draft very little of some models, or requires without pattern draft, the outer wall of model is similar to be vertically set on sandbox substantially In, when draft, model and sand mold are constantly in friction, along with molding sand used in casting contains binder, are had certain Viscosity, therefore in the very little or none pattern draft of pattern draft, when model is embedded in deeper in sand, may cause can not molding, Model is difficult to extract, and existing model mostly uses wooden mold, and woodwork intensity is inadequate, is easy during draft because of nothing Method is smoothly extracted and is broken, and remains in a part of model in sand mold, is caused model damage even sand mold damage, is Foundry Production It affects.

Summary of the invention

Based on the problems of the above-mentioned prior art, it is smaller in model pattern draft that the object of the present invention is to provide one kind, Or draft method when requiring without pattern draft.

In order to achieve the above objectives, the technical scheme adopted by the invention is as follows: model used for casting draft method, in the outer of model One layer of spacer is adhered on surface, and model is put into sandbox together with spacer, extracts model after sand washing sizing.Draft is completed Afterwards, the spacer that will be left on sand mold is separated with sand mold.

Further, the spacer is paper.

Further, the paper with a thickness of 60-80 μm.

Further, the paper is fixed on model in edge by adhesive tape.

Further, the spacer is evaporative pattern.

Further, the evaporative pattern with a thickness of 2-3mm.

Further, the evaporative pattern is fixed on model by nail.

Further, the draft method less than 1 ° or requires the model without pattern draft to pull out for pattern draft Mold process.

The invention has the benefit that draft method provided by the invention, it can be smaller in model pattern draft, or require Without pattern draft, model be embedded in sand it is relatively deep, can not molding when, be smoothly detached model with sand mold.

Detailed description of the invention

Fig. 1 is schematic diagram of the present invention,

In figure: 1, sandbox, 2, sand mold, 3, model, 4, spacer.

Specific embodiment

In order to be more clear structure and function of the invention, following will be combined with the drawings in the embodiments of the present invention, to this Technical solution in inventive embodiments is clearly and completely described.

Embodiment 1

The draft process of the model without pattern draft is applied in pattern draft less than 1 ° or required to model used for casting draft method, Adhere to one layer of paper in the outer surface of model, model is put into sandbox together with paper, extracts model after sand washing sizing.Mould When type is extracted, since sand mold has viscosity, paper and model separation, model due to can smoothly be extracted with paper friction very little, Paper is left on the inner wall of sand mold, by manually tearing off.

Further, the paper with a thickness of 60-80 μm.

Paper is pasted on the outer surface of model using some and unstable mode by so-called attachment, such as uses adhesive tape It is fixed at several places of paper, or is pasted paper on model and other can be by the way of in corner with paste Etc..This bonding method can make paper be maintained on model but be easy to and model separation.

By on the side paper bag of model or paper is sticked in side, it is placed in sandbox, is buried with sand, after sand hardens, It is easy to take out model from sand, no problem sand mold thoroughly hardens.Operating process is simple and convenient, solves and is difficult to pull out Mould and model, sand mold problem easy to damage.

Paper does not need all to wrap the outer surface of entire model, it is only necessary to which pattern draft is lesser one or several Side wall (vertical plane) is with can be realized draft on paper bag.

Embodiment 2

The draft process of the model without pattern draft is applied in pattern draft less than 1 ° or required to model used for casting draft method, One layer of evaporative pattern thin slice is nailed on nail in the outer surface of model, model is put into sandbox together with evaporative pattern thin slice, sand washing Model is extracted after sizing.When model is extracted, since sand mold has viscosity, evaporative pattern thin slice and model separation, model and nail It being pulled out together, the nail on model scratches evaporative pattern thin slice, and the evaporative pattern thin slice scratched is left on the inner wall of sand mold, By manually tearing off.

Further, the evaporative pattern thin slice with a thickness of 2-3mm.The corresponding position of model can reduce 2-3mm accordingly Or model size is constant.Since the dimensions of heavy castings is bigger, not shadow when the big 2-3mm of the outer wall dimension of some casting Ring the performance of entire casting；And relatively high casting is required for some pairs of sizes, size is not ensured that in casting process It is consistent with standard, therefore in general, such casting is all the larger of casting, reaches casting dimension by post-production cutting To requirement.Therefore the model for needing to follow closely evaporative pattern can be corresponding smaller or be equal to size with casting, what guarantee was poured out Casting is greater than or equal to size as defined in (limiting condition be equal to) and cuts extra part or not using post-production It influences directly to ignore in the case of entire cast properties.

Heavy castings are thinly sliced with evaporative pattern and are stained with, and this method is to Single unit job lot production or alternative particularly flexible good With.And the function of evaporative pattern itself may be implemented as spacer for evaporative pattern, and structure is complicated to some, it is difficult to the position of demoulding Or paper is difficult to the position pasted, evaporative pattern can directly carry out moulding in sandbox, reduce casting draft difficulty.

It is smaller to be suitable for pattern draft, or requires the model without pattern draft, i.e. mould for draft method of the present invention The contact surface of type and sand mold is vertically or near vertical, the draft direction of model are the one party along plane where contact surface It, in this case, also can be easily even if model is buried in sandbox to (model outer wall contacts always with sand mold inner wall) It extracts.

Spacer of the invention includes but is not limited to paper and evaporative pattern thin slice, it can be achieved that its isolation features, can reduce Friction, suitable for draft process other materials object, such as polybag also belongs to the protection scope of spacer of the present invention. Adhering mode of the invention includes but is not limited to adhesive tape, paste, nail etc., it can be achieved that spacer and model are simply fixed and be easy to Isolated adhering mode all belongs to the scope of protection of the present invention.And those skilled in the art are the case where spacer material changes Under, to the adaptation that the adhering mode of spacer is made, also belong to protection scope of the present invention.

Listed above is only highly preferred embodiment of the present invention.It is clear that the invention is not restricted to which above embodiments, can also have Many deformations.All deformations that those skilled in the art directly can export or associate from present disclosure, It is considered as protection scope of the present invention.

Claims

1. model used for casting draft method, it is characterised in that: model outer surface adhere to one layer of spacer, by model be isolated Piece is put into sandbox together, extracts model after sand washing sizing.

2. model used for casting draft method according to claim 1, it is characterised in that: the spacer is paper.

3. model used for casting draft method according to claim 2, it is characterised in that: the paper with a thickness of 60-80 μ m。

4. model used for casting draft method according to claim 2, it is characterised in that: the paper passes through glue in edge Band is fixed on model.

5. model used for casting draft method according to claim 1, it is characterised in that: the spacer is evaporative pattern.

6. model used for casting draft method according to claim 5, it is characterised in that: the evaporative pattern with a thickness of 2- 3mm。

7. model used for casting draft method according to claim 5, it is characterised in that: the evaporative pattern is fixed by nail On model.

8. model used for casting draft method according to claim 1, it is characterised in that: the draft method is used for Pattern draft less than 1 ° or require the model without pattern draft draft process.