Die for branched sand core

Abstract

The utility model discloses a mold for a branched sand core. The mold comprises a sand core forming area and a plurality of main nozzles communicated with the sand core forming area, the sand core forming area comprises a sand core branch area which is complex in shape and far away from the main nozzle; the branch-shaped local area is directly connected with an auxiliary sand shooting channel and an auxiliary shooting nozzle corresponding to the auxiliary sand shooting channel, so that sand can be directly shot into the branch-shaped local area to form a compact branch-shaped local area, and the problem that the area is difficult to compact and form in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of sand core mold technology. Background Technology

[0002] like Figure 1 As shown, this is a branched sand core in the prior art. The sand core's sand inlet channel in the mold is at the top, i.e., position 1'. Sand is injected into the mold cavity from this position to form the integral sand core structure. However... Figure 1 The sand core shown is characterized by a raised, branch-shaped section 2' between the two supports. Because this branch-shaped section has a complex filling structure and is far from the sand injection inlet, the filling at this section 2' is insufficient during sand injection, resulting in low density and a reduced yield of the formed sand core. To ensure the branch-shaped section 2' meets the density requirements, the sand injection pressure needs to be increased. However, since the sand itself wears down the mold during injection, increasing the injection pressure exacerbates mold wear and reduces mold lifespan.

[0003] Therefore, a new technical solution is needed to solve the above problems. Utility Model Content

[0004] To address the problems arising from existing technologies, this invention provides a mold for branched sand cores, solving the problem of how to achieve dense sand formation in branched local areas that are difficult to fill.

[0005] To achieve the above objectives, the mold for branched sand cores of this utility model can adopt the following technical solution:

[0006] A mold for branched sand cores includes a sand core forming area and a plurality of main nozzles communicating with the sand core forming area; the sand core forming area includes a sand core branching area, a plurality of parallel cylindrical areas, and a transverse extension area communicating with one end of each cylindrical area; each main nozzle is communicating with the transverse extension area and each cylindrical area has a corresponding main nozzle; a main nozzle and a corresponding cylindrical area are respectively located on both sides of the transverse extension area; the sand core branching area is located between two adjacent cylindrical areas, and a gap is formed between the sand core branching area and the adjacent cylindrical area;

[0007] It is also equipped with an auxiliary sand-shooting channel and an auxiliary nozzle corresponding to the auxiliary sand-shooting channel. One end of the auxiliary sand-shooting channel is connected to the lateral extension area and the other end is connected to the sand core branch area. The auxiliary sand-shooting channel and the auxiliary nozzle are located on both sides of the lateral extension area.

[0008] Furthermore, the two ends of the auxiliary sand-shooting channel are tapered structures, that is, the width of the connection between the auxiliary sand-shooting channel and the sand core branch area or the lateral extension area is smaller than the inner diameter of the auxiliary sand-shooting channel.

[0009] Furthermore, the middle of the auxiliary sand-shooting channel forms an inwardly concave arc-shaped depression.

[0010] Furthermore, the ratio of the inner diameter of the auxiliary sand-shooting channel at the arc-shaped depression to the maximum inner diameter of the auxiliary sand-shooting channel ranges from 1 / 2 to 2 / 3.

[0011] Furthermore, the inner diameter of the auxiliary sand-shooting channel is smaller than the inner diameter of the cylindrical area.

[0012] Beneficial effects: The mold for branched sand cores provided by this utility model directly connects an auxiliary sand injection channel and an auxiliary nozzle corresponding to the auxiliary sand injection channel to a branched local area where it is difficult to form a dense branched local area, so that sand can be directly injected into the branched local area to form a dense branched local area, thus solving the problem of the difficulty in forming a dense branched local area in the prior art. Attached Figure Description

[0013] Figure 1 This is a structural diagram of a branched sand core in the prior art;

[0014] Figure 2 This is a structural diagram of the mold used for branched sand cores in this utility model;

[0015] Figure 3 To pass Figure 2 The diagram shows the structure of the branched sand core after sand injection molding.

[0016] Figure 4 To be Figure 3 The diagram shows the final product structure after removing excess material from the branched sand core.

[0017] Figure 5 A schematic diagram of the auxiliary sand-shooting channel. Detailed Implementation

[0018] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0019] Please see Figure 2As shown, this utility model discloses a mold for branched sand cores, including a sand core forming area 2 recessed on the mold parting surface 1 and several main nozzles 3 connected to the sand core forming area 2. The sand core forming area 1 is arranged according to the shape of the branched sand core to be formed, including a sand core branching area 4, several parallel cylindrical areas 5, and a transverse extension area 6 connected to one end of each cylindrical area 5. The sand core branching area 4 is located between two adjacent cylindrical areas 5, and a gap is formed between the sand core branching area 4 and the adjacent cylindrical areas 5. The sand core branching area 4 is for forming a branch, but since this part is far from the main nozzles and has a more complex shape, in order to achieve better sand compaction in this area. The mold also includes an auxiliary sand-shooting channel 7 and an auxiliary nozzle 8 corresponding to the auxiliary sand-shooting channel 7. One end of the auxiliary sand-shooting channel 7 is connected to the transverse extension area 6, and the other end is connected to the sand core branch area 4. The auxiliary sand-shooting channel 7 and the auxiliary nozzle 8 are located on both sides of the transverse extension area 6, respectively. The inner diameter of the auxiliary sand-shooting channel 7 is smaller than the inner diameter of the cylindrical area 5. By setting up this auxiliary sand-shooting channel 7, the sand core branch area 4 can directly obtain sand without needing to transfer sand from other areas, thereby increasing the amount and efficiency of sand obtained by the sand core branch area 4 and improving the density of the sand in this area. The basic sand core obtained through this mold is as follows: Figure 3 As shown, the base sand core has a dense, branched local area 9.

[0020] Furthermore, Figure 3 In the basic sand core, a branched section 9 is connected to a sand rod 10, which is formed in the auxiliary sand-shooting channel 5. In the final sand core product, it is obviously necessary to remove this excess sand rod 8. To facilitate the removal of the sand rod 8 from the sand core, combined with... Figure 5 As shown, the auxiliary sand-shooting channel 7 in this mold is designed as follows: Both ends 11 of the auxiliary sand-shooting channel 7 are tapered structures, meaning the width of the connection between the auxiliary sand-shooting channel 7 and the sand core branch area or the lateral extension area is smaller than the inner diameter of the auxiliary sand-shooting channel, forming a frustum-shaped structure at both ends. This results in the sand rod 10 also forming this frustum-shaped structure at both ends, reducing the strength at the connection between the sand rod 10 and the sand core, facilitating the breakage of the sand rod 10 from both ends and its separation from the sand core. Simultaneously, an inwardly concave arc-shaped recess 12 is formed in the middle of the auxiliary sand-shooting channel, creating a smaller diameter arc-shaped breaking groove in the middle of the sand rod 10. This also reduces the strength in the middle of the sand rod 10, making it easier to break the sand rod 10 by striking this location, thus facilitating its detachment from the sand core. Furthermore, practical verification shows that a ratio of 1 / 2 to 2 / 3 between the inner diameter of the auxiliary sand-shooting channel at the arc-shaped recess and the maximum inner diameter of the auxiliary sand-shooting channel effectively breaks the sand rod 10. The final sand core product after removing the sand rod 10 is shown below. Figure 4 .

Claims

1. A mold for branched sand cores, comprising a sand core forming area and a plurality of main nozzles communicating with the sand core forming area; characterized in that, The sand core forming area includes a sand core branching area, several parallel cylindrical areas, and a transverse extension area connected to one end of each cylindrical area. Each main nozzle is connected to the transverse extension area, and each cylindrical area has a corresponding main nozzle. A main nozzle and a corresponding cylindrical area are located on opposite sides of the transverse extension area. The sand core branching area is located between two adjacent cylindrical areas, and a gap is formed between the sand core branching area and the adjacent cylindrical area. It is also equipped with an auxiliary sand-shooting channel and an auxiliary nozzle corresponding to the auxiliary sand-shooting channel. One end of the auxiliary sand-shooting channel is connected to the lateral extension area and the other end is connected to the sand core branch area. The auxiliary sand-shooting channel and the auxiliary nozzle are located on both sides of the lateral extension area.

2. The mold for branched sand cores according to claim 1, characterized in that, The two ends of the auxiliary sand-shooting channel are tapered structures, meaning that the width of the connection between the auxiliary sand-shooting channel and the sand core branch area or the lateral extension area is smaller than the inner diameter of the auxiliary sand-shooting channel.

3. The mold for branched sand cores according to claim 1 or 2, characterized in that, The auxiliary sand-shooting channel has an inwardly concave arc-shaped depression in the middle.

4. The mold for branched sand cores according to claim 1 or 2, characterized in that, The ratio of the inner diameter of the auxiliary sand-shooting channel at the arc-shaped depression to the maximum inner diameter of the auxiliary sand-shooting channel ranges from 1 / 2 to 2 / 3.

5. The mold for branched sand cores according to claim 1, characterized in that, The inner diameter of the auxiliary sand-shooting channel is smaller than the inner diameter of the cylindrical area.

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