CN222873303U - Casting die utensil of built-in blind riser - Google Patents

Abstract

The utility model provides a casting die with a built-in blind riser. The casting mold with the built-in blind riser comprises a molding box, a sand core is arranged in the molding box, a cavity of a casting is formed between the sand core and the inner space of the molding box, the blind riser is arranged above the cavity, an integrated inner runner is arranged on the side part of the blind riser, the liquid outlet end of the inner runner is positioned at the top of the cavity, and the size of the inner runner is gradually reduced along the liquid outlet end from the liquid inlet end to form a prismatic table shape. The utility model adopts a casting process with the built-in blind riser, integrates the blind riser and the ingate, has more direct and effective feeding effect, adopts the similar horn-shaped ingate, avoids tooth form, increases the fluidity of molten iron, and ensures that sand cleaning is more convenient and labor-saving.

Description

Casting die utensil of built-in blind riser

Technical Field

The utility model relates to the technical field of casting molds, in particular to a casting mold with a built-in blind riser.

Background

When a large extraction amount vacuum pump rotor casting is prepared, a technological scheme of open riser is adopted in the prior art, but a good molten iron feeding effect cannot be achieved, and casting defects such as shrinkage porosity and shrinkage cavity are easily generated in the product. And because the vacuum pump rotor casting has the profile of tooth, if the runner is located profile of tooth department in the casting process, influence the mobility of molten iron, increased the degree of difficulty of follow-up sand removal, the existence of profile of tooth also makes the stripping have certain degree of difficulty.

Disclosure of utility model

Based on the problems, the existing technical scheme for preparing the rotor casting of the vacuum pump with large extraction quantity is required to solve the problem that casting defects such as shrinkage porosity and shrinkage cavity are easy to occur in products, and a casting die with built-in blind riser is provided.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The utility model provides a casting die utensil of built-in blind riser, includes the molding box, the built-in psammitolite of molding box, forms the die cavity of foundry goods between the inner space of psammitolite and molding box, and the top of die cavity has the blind riser, and the lateral part of blind riser has integrative ingate, and the play liquid end of ingate is located the die cavity top, and the ingate is from liquid inlet end along play liquid end size diminishing gradually, is the prismatic table form.

The sand core comprises an inner core and an outer core, wherein the outer core is positioned at the periphery of the inner core, a gap between the inner core and the outer core and the molding box jointly form a cavity of a casting, and the outer core is formed by two split cores which are spliced into a whole in a concave-convex fit manner.

Further, one of the core end faces of the outer core is symmetrically provided with a bulge, the bulge is gradually reduced along the radial width, the end face of the other core is correspondingly provided with a groove matched with the bulge, and when the two core end faces are attached, the bulge is all located in the groove.

Further, one of the core end faces of the outer core is provided with a bulge in a staggered mode, the bulge is gradually reduced along the radial width, the end face of the other core is correspondingly provided with a groove matched with the bulge, and when the two core end faces are attached, the bulge is located in the groove.

Furthermore, the mold box is internally provided with a cross runner and a straight runner, the blind riser is positioned in the cross runner, one end of the cross runner is communicated with the straight runner, the straight runner is longitudinally arranged, and the top end of the straight runner is flush with the top of the mold box.

Further, a filter disc is arranged at the communication part of the cross gate and the sprue.

Further, the top of the inner core is provided with a flat-mouth-shaped air outlet, and the air outlet is narrow at the bottom and wide at the top.

Further, the height of the liquid inlet end of the inner pouring channel is smaller than the width, and the height of the liquid inlet end is consistent with the width of the liquid outlet end.

Further, the inner core is in a rotor shape of the vacuum pump, the outer core is in a sleeve shape, and the liquid outlet end of the inner runner is positioned at the top of the tooth-shaped part of the inner core.

Compared with the prior art, the utility model has the beneficial effects that:

1. The utility model adopts a casting process with built-in blind riser, integrates the blind riser and the ingate, has more direct and effective feeding effect, adopts a horn-like ingate, avoids tooth form, increases the fluidity of molten iron, and ensures that sand removal is more convenient and labor-saving;

2. the utility model adopts a double-split core structure design at the tooth shape, thereby avoiding the high difficulty of stripping.

Drawings

The disclosure of the present utility model is described with reference to the accompanying drawings. It should be understood that the drawings are for purposes of illustration only and are not intended to limit the scope of the present utility model in which like reference numerals are used to designate like parts. Wherein:

FIG. 1 is a top view of a casting mold with built-in blind riser according to the present utility model;

FIG. 2 is a perspective view of the blind riser based on FIG. 1;

fig. 3 is a schematic illustration of a dual split core based on the outer core of fig. 1.

The figure is marked with the specification of 1, a molding box, 2, a sand core, 21, an inner core, 22, an outer core, 3, a blind riser, 4, an inner runner, 5, a cross runner, 6, a straight runner, 7 and an air outlet.

Detailed Description

It is to be understood that, according to the technical solution of the present utility model, those skilled in the art may propose various alternative structural modes and implementation modes without changing the true spirit of the present utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.

Example 1

Referring to fig. 1, the present embodiment describes a casting mold with built-in blind riser, which mainly comprises a molding box 1, a sand core 2, a blind riser 3, an inner runner 4, a cross runner 5, a sprue 6, and the like. The sand core 2 is located in the molding box 1, and the sand core 2 comprises an outer core 22 and an inner core 21, and because the embodiment takes the casting of the vacuum pump rotor with large extraction quantity as an example, the cavity gap between the inner core 21 and the outer core 22 forms the cavity of the vacuum pump rotor with large extraction quantity, namely the cavity of the casting. Since the sand core 2 is located in the mold 1, the remaining gaps of the sand core 2 and the mold 1 except for the cavity of the casting can be filled with resin sand or the like.

The two ends of the inner core 21 are in shaft shape, the middle part is provided with tooth shape, the outer core 22 is in cylinder shape and is arranged on the periphery of the inner core 21. In order to reduce the difficulty of drawing, the outer core 22 is formed by two split cores, namely, the two split cores are spliced together in a concave-convex fit manner to form the outer core 22, and the two split cores are identical in shape and are semi-annular. As shown in fig. 3, in order to facilitate the split joint of two split cores, the end faces of one split core are symmetrically provided with protrusions, the protrusions gradually shrink along the radial width, the end faces of the other split core are correspondingly provided with grooves adapted to the protrusions, when the end faces of the two split cores are attached, the protrusions are all located in the grooves, and the two split cores are spliced into a complete inner core 21. In order to facilitate the air discharge in the die cavity of the casting, the top of the inner core 21 is provided with a flat-mouth-shaped air outlet 7, and the air outlet 7 is in a shape of narrow lower part and wide upper part, so that the air flow is conveniently guided to be discharged upwards.

As shown in fig. 2, the top of the inner core 21 with the tooth-shaped part is overlapped with the liquid outlet end of the inner runner 4, the inner runner 4 is integrally communicated with the blind riser 3, the blind riser 3 is positioned on the cross runner 5 and is communicated with the straight runner 6, one end of the cross runner 5 is communicated with the straight runner 6, and the top end of the straight runner 6 is longitudinally arranged and is flush with the top of the molding box 1, so that molten iron is poured into the straight runner 6 in the casting process, then enters the blind riser 3 along the cross runner 5, and finally enters the cavity through the inner runner 4. In order to facilitate the molten iron to enter the cavity, the size of the port of the inner pouring channel 4 along the liquid outlet end from the liquid inlet end is gradually reduced, and the whole shape is prismatic table. I.e. the dimension of one end of the ingate 4 connected with the blind riser 3 is larger than the dimension of the other end. In addition, the height of the liquid inlet end of the ingate 4 can be limited to be smaller than the width, and the height of the liquid inlet end is consistent with the width of the liquid outlet end, so that the size of the ingate is in a proper range. In order to reduce the entry of impurities into the cavity, a filter disc is arranged at the connection between the cross gate 5 and the sprue 6.

The casting process with the built-in blind riser is adopted, the blind riser and the inner pouring gate are integrated, the feeding effect is more direct and effective, the horn-shaped inner pouring gate is adopted, tooth shapes are avoided, the fluidity of molten iron is improved, sand cleaning is more convenient and labor-saving, and the double-split core structure design is adopted at the tooth shapes, so that the high-difficulty stripping is avoided.

Example 2

This embodiment describes a casting mold with built-in blind heads, which is basically the same in structure as the casting mold with built-in blind heads described in embodiment 1. The difference is that the end face of one of the split cores 22 of the outer core of the present embodiment is provided with a protrusion in a dislocation manner, the protrusion is gradually reduced in radial width, the end face of the other split core is correspondingly provided with a groove adapted to the protrusion, and the protrusions are all located in the groove when the two split core end faces are attached. The dislocation arrangement increases the difficulty of splicing, but can reduce the arrangement of the number of the protrusions and the grooves.

This embodiment has the same advantageous effects as embodiment 1.

The technical scope of the present utility model is not limited to the above description, and those skilled in the art may make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present utility model, and these changes and modifications should be included in the scope of the present utility model.

Claims (7)

1. The casting mold is characterized by comprising a mold box (1), wherein a sand core (2) is arranged in the mold box (1), a cavity of a casting is formed between the sand core (2) and the inner space of the mold box (1), the blind riser (3) is arranged above the cavity, an integrated ingate (4) is arranged on the side part of the blind riser (3), the liquid outlet end of the ingate (4) is positioned at the top of the cavity, and the size of the ingate (4) is gradually reduced along the liquid outlet end from the liquid inlet end to form a prismatic table shape;

The sand core (2) comprises an inner core (21) and an outer core (22), the outer core (22) is located on the periphery of the inner core (21), gaps between the inner core (21) and the outer core (22) and the molding box (1) form a cavity of a casting together, the outer core (22) is formed by two split cores, the two split cores are in concave-convex fit and spliced together, an air outlet (7) in a flat mouth shape is formed in the top of the inner core (21), and the air outlet (7) is in a shape of being narrow down and wide up.

2. Casting mould with built-in blind riser (3) according to claim 1, characterized in that one of the core-dividing end faces of the outer core (22) is symmetrically provided with a protrusion, the width of the protrusion is gradually reduced along the radial direction, the end face of the other core-dividing end face is correspondingly provided with a groove adapted to the protrusion, and when the two core-dividing end faces are attached, the protrusions are all positioned in the groove.

3. Casting mould with built-in blind riser (3) according to claim 1, characterized in that one of the core-dividing end faces of the outer core (22) is provided with a protrusion in a staggered manner, the protrusion is gradually reduced in radial width, the end face of the other core-dividing end face is correspondingly provided with a groove adapted to the protrusion, and when the two core-dividing end faces are attached, the protrusions are all positioned in the groove.

4. The casting die with the built-in blind riser (3) according to claim 1, wherein the mold (1) is internally provided with a cross runner (5) and a straight runner (6), the blind riser (3) is arranged in the cross runner (5) and communicated, one end of the cross runner (5) is communicated with the straight runner (6), and the straight runner (6) is longitudinally arranged and the top end of the straight runner is flush with the top of the mold (1).

5. Casting mould with built-in blind riser (3) according to claim 4, characterized in that the junction of the runner (5) and the sprue (6) is provided with a filter sheet.

6. Casting mould with built-in blind riser (3) according to claim 1, characterized in that the height of the liquid inlet end of the ingate (4) is smaller than the width, and the height of the liquid inlet end is consistent with the width of the liquid outlet end.

7. Casting mould with built-in blind riser (3) according to claim 1, characterized in that the inner core (21) is in the shape of a vacuum pump rotor, the outer core (22) is in the shape of a sleeve, and the liquid outlet end of the inner runner (4) is positioned at the top of the tooth-shaped part of the inner core (21).