CN209465651U - A kind of mould structure increasing molding sand compact rate of molding - Google Patents

Abstract

The utility model relates to a kind of mould structures for increasing molding sand compact rate of molding, including die ontology, the die ontology include lower die and upper mold, and the lower die includes bottom plate, and annular sidewall is provided on the bottom plate, and the annular sidewall encloses a type chamber；It further include a wedge block, the bottom of the type chamber is arranged in the wedge block, and the area of section of the wedge block is gradually reduced from the bottom of type chamber toward the opening of type chamber.The wedge block that area of section gradually changes is arranged in the utility model in the annular sidewall of mold, when sandbox plus sand consolidation, since wedge block is to the water conservancy diversion of molding sand and reversely to the extruding force of annular sidewall, the compact rate of molding for improving product side-walls molding sand, solve core cavity side wall due to molding sand compact rate of molding not enough caused by sand washing, scab the problems such as.

Description

A kind of mould structure increasing molding sand compact rate of molding

Technical field

The utility model belongs to casting field, and in particular to a kind of mould structure to increase molding sand compact rate of molding.

Background technique

Product produces mold in casting first, then injects molding sand in a mold to shape forming cavity, then in type chamber Middle pouring liquid metal, and then form cast product.

Structure with deeper intracavity sidewall, such as the brake disc of automobile, as shown in Figure 1, it is structural representation of brake disc Figure.In casting, the compact rate of molding of the molding sand of intracavity sidewall A corresponding position is often inadequate, that is to say, that the type chamber pair made The position of intracavity sidewall A is answered, compact rate of molding is inadequate, and then will cause intracavity sidewall A scab, the sand washing of cast product, influences casting The surface quality of product.

Currently, the mode routinely to solve the above problems is to set about from molding sand direction, mentioned using the formula of change molding sand The compact rate of molding of high molding sand, however excessively high compact rate of molding, affect the contraction of casting and the exhaust of sand mold instead, and then derive new Product quality problem.

Utility model content

The purpose of this utility model is to provide a kind of mould structures for increasing molding sand compact rate of molding, effectively to solve existing skill The shortcoming of art.

In order to achieve the above objectives, the utility model adopts the following technical solution:

A kind of mould structure increasing molding sand compact rate of molding, including die ontology, the die ontology include lower die and upper mold, The lower die includes bottom plate, and annular sidewall is provided on the bottom plate, and the annular sidewall encloses a type chamber；It further include a wedge Shape block, the wedge block are arranged in the bottom of the type chamber, and the area of section of the wedge block is from the bottom of type chamber toward type chamber Opening be gradually reduced.

Compared with the existing technology, the wedge shape that area of section gradually changes is arranged in the utility model in the annular sidewall of mold Block, since wedge block is to the water conservancy diversion of molding sand and reversely to the extruding force of annular sidewall, improves product when sandbox plus sand consolidation The compact rate of molding of side-walls molding sand, solve core cavity side wall due to molding sand compact rate of molding not enough caused by sand washing, scab the problems such as.

Further, the wedge block is rotary table.The side of rotary table is the curved surface of even variation, conducive to the flowing of molding sand.

Further, the center overlapping of axles of the central axis of the rotary table and the type chamber.Rotary table is set to annular sidewall The center of the type chamber enclosed, so that mold thickness is identical everywhere, stress variation is uniform.

Further, the angle of the central axis of the bus of the rotary table and the rotary table is 8 °~15 °.Rotary table bus and circle Platform central axis angle appropriate, conducive to the water conservancy diversion to molding sand and reversely to the extruding force of annular sidewall.

Further, the height of the rotary table is less than the depth of the type chamber, and the basal diameter of the rotary table is not more than institute State the radius of type chamber.The height for limiting rotary table is less than the depth of type chamber, to guarantee that moulding machine compacting molding sand, compacting-type can be used During sand, the pressure head of moulding machine is unlikely to touch rotary table；The basal diameter of rotary table is limited to guarantee mold thickness, it is ensured that formed Molding sand it is solid reliable.

Further, the rotary table and the lower die are integrally machined molding.

Further, the rotary table is fixed by screws in the bottom of the type chamber.

Further, the die ontology is brake disc die ontology.

In order to be more clearly understood that the utility model, the specific embodiment party of the utility model is illustrated below with reference to attached drawing Formula.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of brake disc；

Fig. 2 is the structural schematic diagram of the utility model mold；

Fig. 3 is the diagrammatic cross-section of lower die in the utility model mold.

Wherein, appended drawing reference are as follows:

A- intracavity sidewall, B- type chamber, 10- lower die, 20- upper mold, 11- bottom plate, 12- annular sidewall, 13- rotary table.

Specific embodiment

To solve the shortcomings of the prior art and defect, the utility model provides a kind of mould for increasing molding sand compact rate of molding Lamps structure, by the way that the wedge block that gradually changes of area of section is arranged in the annular sidewall of mold, reinforce to the water conservancy diversion of molding sand and To the extruding force of annular sidewall, and then improve the compact rate of molding of molding sand.

Below by taking the brake disc of automobile as an example, and in conjunction with attached drawing, a kind of increase molding sand consolidation of the utility model is described in detail The mould structure of rate.Referring to Fig. 1, its be brake disc structural schematic diagram, as shown in Figure 1, the middle part of brake disc have one compared with Deep intracavity sidewall A.

The brake disc mould structure, including brake disc die ontology, the brake disc die ontology include lower die 10 and upper mold 20, which includes bottom plate 11, annular sidewall 12 and wedge block, and wherein annular sidewall 12 encloses a type chamber on bottom plate 11 B, the wedge block are arranged in the bottom of type chamber B, and the area of section of the wedge block from the bottom of type chamber B toward the opening of type chamber B by Decrescence small, also that is, when lower die 10 is laid flat, the biggish end face of the wedge block area is connect with bottom plate 11.Referring to Fig. 2, it is The structural schematic diagram of the utility model mold.

In preferred the present embodiment, which is rotary table 13.

In preferred the present embodiment, the central axis of the rotary table 13 and the center overlapping of axles of type chamber B exist the setting of rotary table 13 The center of type chamber B, so that mold thickness is identical everywhere, stress variation is uniform.

In preferred the present embodiment, the rotary table 13 and lower die 10 are integrally machined molding, and guarantee rotary table will not topple over and phase To sliding.Alternatively, the rotary table 13 can also be connect by screw with the bottom of type chamber B, it is for convenience detach and cleaning.

In preferred the present embodiment, the angle of the central axis of the bus and rotary table 13 of the rotary table 13 is 8 °~15 °, at this In embodiment, which is preferably 10 °.The bus of rotary table 13 and the center between centers angle appropriate of rotary table 13, strengthen to type The extruding force of the diversion effect of sand and molding sand to annular sidewall 12.Please refer to Fig. 3, under in the utility model mold The diagrammatic cross-section of mould.

In preferred the present embodiment, the height of rotary table 13 is set smaller than the depth of type chamber B, the i.e. height of rotary table 13 not More than the upper surface of annular sidewall 12.The molding sand injected in toward the mold, in the side slide-in type chamber B of rotary table 13, in type Under the extruding force effect of 13 side of sand self gravity and rotary table, the molding sand in type chamber B is compacted, and is lower than 12 upper surface of annular sidewall Rotary table 13, with guarantee molding sand is compacted using forming press when, the pressure head of forming press will not touch rotary table, it is ensured that molding sand Compact rate of molding and operation safety.

In preferred the present embodiment, the basal diameter of rotary table 13 is not more than the radius of type chamber B.Excessive rotary table 13, makes It is not enough to obtain mold thickness, causes molding sand not solid enough, is easy to be damaged；And too small rotary table 13, water conservancy diversion and squeezing effect are not Enough ideals.

The utility model mould structure injects molding sand, molding sand in use, by after 20 fitting of lower die 10 and upper mold in mold It is accumulated in type chamber B, molding sand is in self gravity, the extruding force and die mould compressing head of annular sidewall 12 and 13 side of rotary table at this Compaction under, be tightly compacted, compact rate of molding of the molding sand of formation at type chamber B is higher.Upper and lower mould is separated, sand is taken out Type carries out the casting of brake disc product, since compact rate of molding of the sand mold at type chamber B is higher, brake disc product using the sand mold Corresponding intracavity sidewall A does not just allow to be also easy to produce the bad phenomenons such as scab, sand washing, and the surface quality of cast product is guaranteed.

Compared with the existing technology, the rotary table with constant slope is arranged in the utility model in the annular sidewall of mold, when When sandbox adds sand consolidation, since rotary table is to the water conservancy diversion of molding sand and reversely to the extruding force of annular sidewall, improve in cast product The compact rate of molding of chamber side-walls molding sand, solve product core cavity side wall due to molding sand compact rate of molding it is inadequate caused by sand washing, viscous The problems such as sand.

The utility model is not limited to above embodiment, if the various changes or deformation to the utility model do not take off Spirit and scope from the utility model, if these changes and deformation belong to the claims and equivalents of the utility model Within the scope of, then the utility model is also intended to encompass these changes and deformation.

Claims (8)

1. a kind of mould structure for increasing molding sand compact rate of molding, including die ontology, the die ontology include lower die and upper mold, institute Stating lower die includes bottom plate, and annular sidewall is provided on the bottom plate, and the annular sidewall encloses a type chamber, it is characterised in that: It further include a wedge block, the bottom of the type chamber is arranged in the wedge block, and the area of section of the wedge block is by type chamber The opening of bottom toward type chamber is gradually reduced.

2. the mould structure according to claim 1 for increasing molding sand compact rate of molding, it is characterised in that: the wedge block is circle Platform.

3. the mould structure according to claim 2 for increasing molding sand compact rate of molding, it is characterised in that: the central axis of the rotary table With the center overlapping of axles of the type chamber.

4. it is according to claim 3 increase molding sand compact rate of molding mould structure, it is characterised in that: the bus of the rotary table with The angle of the central axis of the rotary table is 8 °~15 °.

5. the mould structure according to claim 4 for increasing molding sand compact rate of molding, it is characterised in that: the height of the rotary table is small In the depth of the type chamber, the basal diameter of the rotary table is not more than the radius of the type chamber.

6. it is according to claim 5 increase molding sand compact rate of molding mould structure, it is characterised in that: the rotary table and it is described under Mould is integrally machined molding.

7. the mould structure according to claim 5 for increasing molding sand compact rate of molding, it is characterised in that: the rotary table passes through screw It is fixed on the bottom of the type chamber.

8. increasing the mould structure of molding sand compact rate of molding described in any one claim according to claim 1~7, feature exists In: the die ontology is brake disc die ontology.