CN203330341U

CN203330341U - Sand mould of spiral rotor

Info

Publication number: CN203330341U
Application number: CN2013204381268U
Authority: CN
Inventors: 范並明
Original assignee: ZHEJIANG HANSON PRECISE MACHINERY Co Ltd
Current assignee: ZHEJIANG HANSON PRECISE MACHINERY Co Ltd
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2013-12-11
Anticipated expiration: 2023-07-19

Abstract

The utility model discloses a sand mould of a spiral rotor, and relates to the field of sand casting. The technical problem that a sand mould is lack of strength due to improper selection of a mould joint in the prior art is solved. A through hole is formed in the sand mould of the spiral rotor, a plurality of spiral grooves corresponding to the spiral rotor are formed in the inner wall of the through hole, the spiral grooves form tooth grooves in the end face of the sand mould, the sand mould is divided into an upper sand mould and a lower sand mould through a mould joint, and the section line formed by the mould joint in the end portion of the sand mould is located between two adjacent tooth grooves. After the specific position of the section line is limited, the section line is located on a protruding ridge formed between adjacent tooth grooves, the sand thickness of the upper mould and the sand thickness of the lower sand mould are ensured, wherein the upper mould and the lower mould are formed through the mould joint, and therefore the strength of the sand mould is ensured.

Description

A kind of sand mold of helical rotor

[technical field]

The utility model relates to the sand mold of a kind of sand mold, particularly a kind of helical rotor.

[background technology]

The sand casting is metal casting technique commonly used, and the sand mold used in the sand casting is the key of moulding, is provided with the die cavity corresponding with profiled member in sand mold, and sand mold is dissectd into two along die joint.In the sand mold of helical rotor, the selection of die joint is particularly important, the sand mold inside of helical rotor consists of some spiral convex ribs, the uneven thickness at its diverse location place, therefore the difference of dissecing angle can affect the thickness of sand mold, pulling force when the too small sand mold of thickness can not reach the demoulding because of intensity requires to rupture, and causes sand mold to be scrapped.

[summary of the invention]

Technical problem of the present utility model is to provide a kind of sand mold of helical rotor, and the cutting line of sand mold end face is limited, and guarantees that the meat of sand mold is thick after somatotype, avoids the sand mold knockout course to produce and scraps.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of sand mold of helical rotor, be provided with through hole in described sand mold, the inwall of described through hole is provided with some helical grooves corresponding with helical rotor, described helical groove has formed serrate slot at the end face of sand mold, described sand mold is divided into upper sand mold and lower sand mold by die joint, and the cutting line that described die joint forms in the sand mold end is between two adjacent serrate slots.

Further, described cutting line is positioned at the middle of two adjacent serrate slots.

The beneficial effects of the utility model:

The sand mold of helical rotor of the present utility model, the cutting line that its die joint forms in the sand mold end is between two adjacent serrate slots, cutting line is on the convex ridge formed between adjacent serrate slot, after specifically the position of cutting line being limited, the upper sand mold that sand mold forms along die joint and the sand of lower sand mold is thick all is guaranteed, avoid the sand mold thickness deficiency after causing separating because of the separation inequality, affect the quality of sand mold.

These characteristics of the present utility model and advantage will be below the specific embodiment, accompanying drawing in detailed exposure.

[accompanying drawing explanation]

Below in conjunction with accompanying drawing, the utility model is described further:

Fig. 1 is front view of the present utility model;

The structural representation that Fig. 2 is upper sand mold in the utility model;

The schematic diagram that Fig. 3 is contrast sand mold in the utility model.

[specific embodiment]

The utility model provides a kind of sand mold of helical rotor, be provided with through hole in sand mold, the inwall of through hole is provided with some helical grooves corresponding with helical rotor, helical groove has formed serrate slot at the end face of sand mold, sand mold is divided into upper sand mold and lower sand mold by die joint, and the cutting line that forms in the sand mold end of this die joint is between two adjacent serrate slots.

With reference to figure 1 and Fig. 3, the two kinds of different parting methods of comparing, in Fig. 1 die joint at the cutting line 41 of sand mold 1 end face between two adjacent serrate slots 41, and the cutting line 41 in Fig. 3 is positioned on serrate slot 31, after different separation modes cause somatotype, the sand of sand mold and cutting line adjacent is thick very Datong District; In sand mold shown in Fig. 3, the cutting line of this angle can cause after somatotype near the thick deficiency of sand of position cutting line, thereby the pulling force requirement while causing sand mold intensity not reach the demoulding may cause sand mold to be scrapped.Fig. 1 is sand mold in the utility model, and the position of cutting line is selected well to have guaranteed that after the somatotype, the sand of sand mold is thick.

Technical scheme below in conjunction with the accompanying drawing of the utility model embodiment to the utility model embodiment is explained and illustrated, but following embodiment is only preferred embodiment of the present utility model, not all.Embodiment based in embodiment, those skilled in the art are other embodiment that obtains under the prerequisite of not making creative work, all belongs to protection domain of the present utility model.

With reference to figure 1 and Fig. 2, the sand mold of shown helical rotor, be provided with through hole 2 in sand mold 1 inside, the inwall of through hole 2 is provided with some helical grooves corresponding with the spiral convex rib of helical rotor 3, helical groove 3 forms at the end face of sand mold 1 serrate slot 31 that annular space distributes, sand mold 1 is divided into upper sand mold 11 and lower sand mold 12 by die joint 4, and the cutting line 41 that die joint 4 forms in sand mold 1 end is between two adjacent serrate slots 31.As can be seen from Figure 1 cutting line 41 is on the convex ridge between two adjacent teeth shape groove 31, because convex ridge place thickness is larger, thereby after the assurance somatotype, the sand of upper sand mold and lower sand mold is thick, and then guarantee the intensity of sand mold, avoid the profiled member knockout course, because the thick deficiency of sand causes sand mold to be scrapped, can guarantee the complete of core, reduce because of sand mold scrap with material unaccounted-for (MUF).

Preferably, cutting line 41 is positioned at the middle of two adjacent serrate slots 31, form profile of tooth convex ridge 32 between two adjacent serrate slots 31, cutting line 41 is applied between the top of two relative profile of tooth convex ridges 32, this scheme is most preferred scheme, the top sand of profile of tooth convex ridge 32 is thick is maximum, can farthest guarantee after somatotype that upper sand mold and lower sand mold are near the wall thickness of cutting line 41 positions.

By above-described embodiment, the purpose of this utility model is by fully effective having reached.The personage who is familiar with this technology should be understood that the utility model includes but not limited to the content of describing in accompanying drawing and the top specific embodiment.Any modification that does not depart from function and structure principle of the present utility model all will be included in the scope of claims.

Claims

1. the sand mold of a helical rotor, be provided with through hole in described sand mold, the inwall of described through hole is provided with some helical grooves corresponding with helical rotor, described helical groove has formed serrate slot at the end face of sand mold, described sand mold is divided into upper sand mold and lower sand mold by die joint, it is characterized in that: the cutting line that described die joint forms in the sand mold end is between two adjacent serrate slots.

2. the sand mold of a kind of helical rotor according to claim 1 is characterized in that: described cutting line is positioned at the middle of two adjacent serrate slots.