Pouring system and casting method for integrated calipers

Abstract

The invention discloses a pouring system for integrated calipers and a casting method, and relates to the technical field of sand mold casting. According to the main technical scheme, the device comprises a sprue model, a cross gate model assembly, an ingate model, a filter screen model, a riser model, a casting model and an exhaust needle model which are sequentially arranged in the flowing direction of molten metal; wherein the cross gate model assembly comprises a first cross gate model, a second cross gate model and a third cross gate model, and the first cross gate model, the second cross gate model and the third cross gate model are sequentially arranged in the direction from the sprue model to the riser model; the ingate model is arranged between the first cross gate model and the second cross gate model; and the filter screen model is arranged between the second cross gate model and the third cross gate model. The purpose of reducing oxide inclusions in molten metal and reducing the probability of slag inclusion and sand slag hole defects in a casting is expected to be achieved. And meanwhile, the aim of reducing the probability of air hole defects of the casting is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sand casting, and in particular to a pouring system and a casting method for an integrated caliper. Background Art

[0002] A "one-piece" caliper is one that combines several separate castings into a single unit.

[0003] The existing "integrated" caliper pouring system includes a sprue, a runner, an ingate, and a filter screen arranged in the sprue or between the sprue and the runner. During use, the molten metal is introduced through the sprue, and after the impurities are removed by the filter screen, it flows into the runner.

[0004] However, due to the change in flow velocity caused by the height difference and the instability of liquid flow (turbulence), the molten metal may produce oxidation inclusions. The oxidation products tend to float on the surface of the molten metal in the runner and may enter the mold cavity through the ingrowth as the molten metal advances, eventually causing slag inclusion defects inside the casting. Summary of the invention

[0005] The object of the present invention is to provide a casting system and a casting method for an integrated caliper, so as to improve the slag blocking ability of the casting system and thereby reduce the probability of sand slag eyes or slag inclusion defects in the casting.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, a casting system for an integrated caliper is provided, comprising a straight runner model, a cross runner model assembly, an entgate model, a filter mesh model, a riser model, a casting model and an exhaust needle model which are sequentially arranged along the flow direction of the molten metal; wherein the cross runner model assembly comprises a first cross runner model, a second cross runner model and a third cross runner model, and the first cross runner model, the second cross runner model and the third cross runner model are sequentially arranged along the straight runner model toward the riser model; the entgate model is arranged between the first cross runner model and the second cross runner model; and the filter mesh model is arranged between the second cross runner model and the third cross runner model.

[0008] A further technical solution is: the sprue model includes a first sprue model unit, a second sprue model unit and a third sprue model unit; the second sprue model unit is connected to the lower end of the first sprue model unit, and the cross-sectional area of ​​the second sprue model unit gradually increases from the upper end of the second sprue model unit to the lower end of the second sprue model unit; the third sprue model unit is connected to the lower end of the second sprue model unit; the cross-sectional area of ​​the third sprue model unit gradually decreases from the upper end of the third sprue model unit to the lower end of the third sprue model unit; and the diameter of the lower end surface of the third sprue model unit is greater than or equal to the diameter of the upper end surface of the first sprue model unit.

[0009] A further technical solution is: the first cross runner model includes two first cross runner model units; the two first cross runner model units are relatively arranged on both sides of the third straight runner model unit; the first cross runner model unit includes a first cross runner model sub-unit and a second cross runner model sub-unit; the first cross runner model sub-unit is connected to the side wall of the third straight runner model unit; the second cross runner model sub-unit is connected to the side of the first cross runner model sub-unit away from the third straight runner model unit; wherein the minimum cross-sectional area of ​​the second cross runner model sub-unit is greater than the minimum cross-sectional area of ​​the first cross runner model sub-unit, and the sum of the minimum cross-sectional areas of the two first cross runner model sub-units is greater than the cross-sectional area of ​​the first straight runner model unit; wherein one end of the thin wall of the casting model is connected to the riser model.

[0010] A further technical solution is: the ingrate model includes two ingrate model units; the two ingrate model units are correspondingly arranged at the lower ends of the two second runner model units.

[0011] A further technical solution is: the second runner model includes a second runner model unit and a third runner model unit; the second runner model unit is arranged on the side of the ingrow model unit away from the first runner model unit; the number of the third runner model units is two, and the two third runner model units are respectively arranged on both sides of the second runner model unit, and the two third runner model units are respectively connected to the side of the two ingrow model units away from the first runner model unit.

[0012] A further technical solution is: the filter mesh model is arranged at the lower end of the second cross runner model unit; the projection of the second cross runner model unit on the upper end surface of the filter mesh model is recorded as the first projection; the first projection is located within the upper end surface of the filter mesh model, and the distance between the edge of the upper end surface of the filter mesh model and the edge of the first projection is D; wherein, D>3mm.

[0013] A further technical solution is: a connecting groove is provided at the upper end of the third cross runner model; the lower end of the filter mesh model is connected to the connecting groove; the distance between the upper end surface of the filter mesh model and the notch of the connecting groove is N; the groove depth of the connecting groove is n; wherein N<n.

[0014] A further technical solution is: the third runner model includes a fourth runner model unit and a fifth runner model unit; the connecting groove is opened on the upper end surface of the fourth runner model unit; the fifth runner model unit is connected to the side of the fourth runner model unit away from the inner runner model unit; the end of the fifth runner model unit away from the fourth runner model unit is connected to the riser model; wherein, the cross-sectional area of ​​the fifth runner model unit increases successively along the direction of the fourth runner model unit to the riser model; and the minimum cross-sectional area of ​​the fifth runner model unit is greater than or equal to the cross-sectional area of ​​the first straight runner model unit.

[0015] In a second aspect, a casting method is provided, wherein the casting method is used for the pouring system as described in the first aspect, and comprises the following operations:

[0016] Place the pouring system in the sand box;

[0017] Filling the sand box with sand having a moisture content of less than 3.6%, and compacting the sand in the sand box to obtain a sand mold corresponding to the pouring system; wherein the air permeability of the sand mold is greater than 110;

[0018] A through hole is opened at the exhaust needle on the sand mold;

[0019] The molten metal at a temperature of 1450-1410°C is injected into the sand mold from the sprue on the sand mold until the molten metal overflows from the through hole;

[0020] Cooling the molten metal in the sand mold to obtain a cooled part;

[0021] The cooled part is cut away to obtain a casting.

[0022] A further technical solution is: when compacting the sand in the sand box, the extrusion pressure of the upper box of the sand box is 80-100N / cm2, and the extrusion pressure of the lower box of the sand box is 100-120N / cm2.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] On the one hand, by installing the filter mesh model between the second cross runner model and the third cross runner model, it is expected to shorten the distance that the molten metal flows to the cavity after being filtered by the filter mesh, thereby reducing the change in the molten metal flow rate caused by the height difference and reducing the probability of turbulence, thereby reducing the oxidation inclusions in the molten metal and reducing the probability of slag inclusions and sand slag eye defects inside the casting.

[0025] On the other hand, one end of the thin wall of the casting model is connected to the riser model, so that after the molten metal flows through the riser model, it can flow from the thin wall end of the casting model to the thick wall end of the casting model, in order to achieve the purpose of reducing the probability of porosity defects in the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the main structure of a casting system for an integrated caliper in this embodiment;

[0027] Figure 2 This is a bottom view structural schematic diagram of an integrated caliper casting system in this embodiment;

[0028] Figure 3 This is a schematic diagram of the top view of the structure of a casting system for an integrated caliper in this embodiment;

[0029] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at the middle BB;

[0031] Figure 6 It is a side view structural schematic diagram of a casting system for an integrated caliper in this embodiment;

[0032] Figure 7 Schematic diagram of a casting method in this embodiment.

[0033] Marks and corresponding parts names in the attached drawings:

[0034] 1-sprue model; 11-first sprue model unit; 12-second sprue model unit; 13-third sprue model unit;

[0035] 2-runner model assembly; 21-first runner model; 211-first runner model unit; 2111-first runner model subunit; 2112-second runner model subunit; 22-second runner model; 221-second runner model unit; 222-third runner model unit; 23-third runner model; 231-fourth runner model unit; 232-fifth runner model unit;

[0036] 3-ingate model; 31-ingate model unit;

[0037] 4-filter mesh model; 5-riser model; 6-casting model; 7-exhaust needle model; 8-connection groove. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Example 1

[0040] This embodiment provides an integrated caliper casting system, such as Figure 1-Figure 6 As shown, it includes a straight runner model 1, a cross runner model assembly 2, an entgate model 3, a filter mesh model 4, a riser model 5, a casting model 6 and an exhaust needle model 7 which are arranged in sequence along the flow direction of the molten metal; wherein the cross runner model assembly 2 includes a first cross runner model 21, a second cross runner model 22 and a third cross runner model 23, and the first cross runner model 21, the second cross runner model 22 and the third cross runner model 23 are arranged in sequence along the straight runner model 1 toward the riser model 5; the entgate model 3 is arranged between the first cross runner model 21 and the second cross runner model 22; the filter mesh model 4 is arranged between the second cross runner model 22 and the third cross runner model 23; wherein one end of the thin wall of the casting model 6 is connected to the riser model 5.

[0041] Exemplarily, during the implementation process, the sprue model 1 is used to form a sprue on the sand mold. The runner model assembly 2 is used to form a runner on the sand mold. The ingrate model 3 is used to form an ingrate on the sand mold. The riser model 5 is used to form a riser on the sand mold. The casting model 6 is used to form a cavity on the sand mold. After the molten metal is injected into the cavity and cooled, a casting with the same structure as the cavity can be formed. The exhaust needle model 7 is used to exhaust the vent channel on the sand mold.

[0042] The runner model assembly 2 includes a first runner model 21 , a second runner model 22 and a third runner model 23 .

[0043] The sprue model 1, the first runner model 21, the ingode model 3, the second runner model 22, the filter screen model 4, the third runner model 23, the riser model 5, the casting model 6 and the exhaust needle model 7 are arranged in sequence according to the direction of the flow of the molten metal (molten iron, molten aluminum, etc.). That is to say, when the molten metal is poured into the sand mold cast by the pouring system, the molten metal flows through the sprue, the first runner, the ingode, the second runner, the filter screen, the third runner and the riser of the sand mold in sequence, and then enters the casting cavity of the sand mold until the molten metal overflows from the exhaust needle of the sand mold.

[0044] Among them, the end of the exhaust needle model 7 close to the casting model 6 is in the shape of a thin sheet with a thickness of 1-3mm, and the exhaust area of ​​the exhaust needle model 7 is greater than or equal to 1 / 2 of the cross-sectional area of ​​the end of the straight runner model 1 away from the first cross runner model 21. The middle part of the exhaust needle model 7 is in the shape of a long strip, and the cross-sectional area of ​​the middle part of the exhaust needle model 7 is greater than the cross-sectional area of ​​the end of the exhaust needle model 7 close to the casting model 6. The cross-sectional area of ​​the end of the exhaust needle model 7 away from the casting model 6 gradually decreases along the direction from the end of the exhaust needle model 7 close to the casting model 6 to the end of the exhaust needle model 7 away from the casting model 6, and the end area of ​​the exhaust needle model 7 away from the casting model 6 is greater than or equal to the end area of ​​the exhaust needle model 7 close to the casting model 6. Preferably, the angle α between the generatrix of the end of the exhaust needle model 7 away from the casting model 6 and the axis of the exhaust needle model 7 is greater than 1°.

[0045] The riser model 5 is connected to one end of the thin wall of the casting model 6.

[0046] By installing the filter mesh model 4 between the second cross runner model 22 and the third cross runner model 23, it is expected to shorten the distance that the molten metal flows to the cavity after being filtered by the filter mesh, thereby reducing the change in the flow rate of the molten metal caused by the height difference and reducing the probability of turbulence, thereby reducing the oxidation inclusions in the molten metal and reducing the probability of slag inclusions and sand slag eye defects inside the casting.

[0047] Preferably, one end of the thin wall of the casting model 6 is connected to the riser model 5, so that after the molten metal flows through the riser model 5, it can flow from the thin wall end of the casting model 6 to the thick wall end of the casting model 6. It is expected to achieve the purpose of reducing the probability of porosity defects in the casting. Among them, the thin wall end of the casting model 6 refers to the end of the casting model 6 with a relatively thin wall thickness, and the thick wall end of the casting model 6 refers to the end of the casting model with a relatively thick wall thickness.

[0048] Example 2

[0049] In order to further improve the slag blocking effect of the pouring system. Figure 5As shown, on the basis of the above-mentioned embodiment 1, in this embodiment, the sprue model 1 includes a first sprue model unit 11, a second sprue model unit 12 and a third sprue model unit 13; the second sprue model unit 12 is connected to the lower end of the first sprue model unit 11, and the cross-sectional area of ​​the second sprue model unit 12 gradually increases from the upper end of the second sprue model unit 12 to the lower end of the second sprue model unit 12; the third sprue model unit 13 is connected to the lower end of the second sprue model unit 12; the cross-sectional area of ​​the third sprue model unit 13 gradually decreases from the upper end of the third sprue model unit 13 to the lower end of the third sprue model unit 13; and the diameter of the lower end surface of the third sprue model unit 13 is greater than or equal to the diameter of the upper end surface of the first sprue model unit 11.

[0050] Exemplarily, during implementation, the sprue model 1 includes a first sprue model unit 11 , a second sprue model unit 12 and a third sprue model unit 13 .

[0051] The first sprue model unit 11 is a cylindrical structure. The first sprue model unit 11 is a starting part of the sprue and is responsible for guiding the molten metal to enter from the pouring port.

[0052] The second sprue model unit 12 is connected to the lower end of the first sprue model unit 11. The second sprue model unit 12 is a truncated cone structure, and the cross-sectional area of ​​the second sprue model unit 12 gradually increases from the upper end of the second sprue model unit 12 to the lower end of the second sprue model unit 12. It is expected that the area with the increased cross-sectional area of ​​the second sprue model unit 12 can accommodate more liquid, thereby alleviating the flow rate of the molten metal. At the same time, the area with the increased cross-sectional area of ​​the second sprue model unit 12 is utilized to make the molten metal flow more smoothly, thereby reducing the turbulence.

[0053] The third sprue model unit 13 is connected to the lower end of the second sprue model unit 12, and the third sprue model unit 13 is a truncated cone structure. The cross-sectional area of ​​the third sprue model unit 13 gradually decreases from the upper end of the third sprue model unit 13 to the lower end of the third sprue model unit 13, until the diameter of the lower end surface of the third sprue model unit 13 is not less than the diameter of the upper end surface of the first sprue model unit 11. It is expected to achieve the purpose of accelerating the flow rate of the molten metal and ensuring sufficient pressure to better fill the subsequent runner and casting cavity.

[0054] By gradually changing the cross-sectional area of ​​different sections of the sprue, the flow rate and pressure distribution of the molten metal can be controlled to a certain extent, thereby optimizing the flow characteristics of the entire pouring process and reducing the occurrence of turbulence, in the hope of reducing the risk of casting defects such as slag inclusions and pores, thereby improving the quality and consistency of castings.

[0055] Preferably, the angle β between the generatrix of the second sprue model unit 12 and the axis of the second sprue model unit 12 is greater than 1°.

[0056] Example 3

[0057] In order to improve the slag blocking effect of the pouring system. Figure 2 Combination Figure 3 As shown, on the basis of the above-mentioned embodiment 2, in this embodiment, the first runner model 21 includes two first runner model units 211; the two first runner model units 211 are relatively arranged on both sides of the third straight runner model unit 13; the first runner model unit 211 includes a first runner model sub-unit 2111 and a second runner model sub-unit 2112; the first runner model sub-unit 2111 is connected to the side wall of the third straight runner model unit 13; the second runner model sub-unit 2112 is connected to the side of the first runner model sub-unit 2111 away from the third straight runner model unit 13; wherein the minimum cross-sectional area of ​​the second runner model sub-unit 2112 is greater than the minimum cross-sectional area of ​​the first runner model sub-unit 2111, and the sum of the minimum cross-sectional areas of the two first runner model sub-units 2111 is greater than the cross-sectional area of ​​the first straight runner model unit 11.

[0058] Exemplarily, in the implementation process, the first runner model 21 includes two first runner model units 211 . The two first runner model units 211 are symmetrically arranged on both sides of the third straight runner model unit 13 .

[0059] The first runner model unit 211 includes a first runner model subunit 2111 and a second runner model subunit 2112. The first runner model subunit 2111 is connected to the side wall of the third straight runner model unit 13, and the second runner model subunit 2112 is connected to the side of the first runner model subunit 2111 away from the third straight runner model unit 13.

[0060] The first runner model subunit 2111 is a trapezoidal structure in which the cross-sectional area of ​​the first runner model subunit 2111 gradually increases from the upper end of the first runner model subunit 2111 to the lower end of the first runner model subunit 2111, and the height of the first runner model subunit 2111 is greater than or equal to twice the average width of the first runner model subunit 2111.

[0061] The second runner model subunit 2112 is a trapezoidal structure in which the cross-sectional area of ​​the second runner model subunit 2112 gradually increases from the upper end of the second runner model subunit 2112 to the lower end of the second runner model subunit 2112, and the height of the second runner model subunit 2112 is greater than or equal to twice the average width of the second runner model subunit 2112.

[0062] Among them, the minimum cross-sectional area of ​​the second runner model subunit 2112 is greater than the minimum cross-sectional area of ​​the first runner model subunit 2111. Optionally, the sum of the minimum cross-sectional areas of the two second runner model subunits 2112 (the area of ​​the upper end surface of the second runner model subunit 2112) is 1.2-3 times the sum of the minimum cross-sectional areas of the two first runner model subunits 2111 (the area of ​​the upper end surface of the first runner model subunit 2111). Preferably, the sum of the minimum cross-sectional areas of the two second runner model subunits 2112 (the area of ​​the upper end surface of the second runner model subunit 2112) is 1.5 times the sum of the minimum cross-sectional areas of the two first runner model subunits 2111 (the area of ​​the upper end surface of the first runner model subunit 2111).

[0063] And the sum of the minimum cross-sectional areas of the two first runner model subunits 2111 is greater than the cross-sectional area of ​​the first runner model unit 11. Optionally, the sum of the minimum cross-sectional areas of the two first runner model subunits 2111 (the area of ​​the upper end surface of the first runner model subunit 2111) is 1.0-1.5 times the cross-sectional area of ​​the first runner model unit 11. Preferably, the sum of the minimum cross-sectional areas of the two first runner model subunits 2111 (the area of ​​the upper end surface of the first runner model subunit 2111) is 1.2 times the cross-sectional area of ​​the first runner model unit 11.

[0064] The cross-sectional area of ​​the second runner model subunit 2112 is larger than the cross-sectional area of ​​the first runner model subunit 2111, and much larger than the cross-sectional area of ​​the first straight runner model unit 11. It is expected to achieve the purpose of making the flow speed of the molten metal around the second runner model subunit 2112 slower, thereby making it easier for the slag to float up and gather around the second runner model subunit 2112.

[0065] Example 4

[0066] In order to further improve the slag blocking effect of the pouring system. Figure 3 Combination Figure 4 As shown, based on the above-mentioned embodiment 3, in this embodiment, the ingrate model 3 includes two ingrate model units 31; the two ingrate model units 31 are correspondingly arranged at the lower ends of the two second runner model units 221.

[0067] Exemplarily, in the implementation process, the above-mentioned ingate model 3 includes an ingate model unit 31. The ingate model unit 31 is connected to the lower end of the second runner model unit 221, and the number of the first ingate model unit 31 is set to two, and the two ingate model units 31 are symmetrically distributed at the lower ends of the two first runner model units 211.

[0068] The ingrate model unit 31 is a sheet structure. Preferably, the thickness of the ingrate model unit 31 is 5 mm. The sum of the cross-sectional areas of the two ingrate model units 31 is less than or equal to 0.8 times the cross-sectional area of ​​the first straight runner model unit 11, and the height of the ingrate model unit 31 is less than or equal to 1 / 5 of the height of the second cross runner model unit 221.

[0069] The ingrate model unit 31 is directly arranged at the lower end of the second runner model unit 221, in the hope of shortening the distance for the molten metal to reach the casting cavity, thereby reducing the risk of turbulence and slag inclusion problems caused by long-distance transmission. At the same time, the two ingrate model units 31 are symmetrically distributed at the lower ends of the two first runner model units 211, so that the molten metal can enter the casting cavity from multiple directions at the same time, in the hope of improving the filling speed and uniformity.

[0070] Example 5

[0071] In order to further improve the slag blocking effect of the pouring system. Figure 3 As shown, on the basis of the above-mentioned Embodiment 4, in this embodiment, the second runner model 22 includes a second runner model unit 221 and a third runner model unit 222; the second runner model unit 221 is arranged on the side of the ingrowth model unit 31 away from the first runner model unit 211; the number of the third runner model units 222 is set to two, and the two third runner model units 222 are respectively arranged on both sides of the second runner model unit 221, and the two third runner model units 222 are respectively connected to the two ingrowth model units 31 away from the side of the first runner model unit 211.

[0072] Exemplarily, during implementation, the second runner model 22 includes a second runner model unit 221 and a third runner model unit 222 .

[0073] The second runner model unit 221 is disposed on a side of the ingrow model unit 31 away from the first runner model unit 211 .

[0074] There are two third runner model units 222 , which are respectively connected to both sides of the second runner model unit 221 , and are respectively connected to one side of the two entrapment model units 31 away from the first runner model unit 211 .

[0075] Among them, the cross-sectional area of ​​the third runner model unit 222 is greater than twice that of the inner runner model unit 31. The end of the third runner model unit 222 close to the second runner model unit 221 is a trapezoidal structure, and the cross-sectional area of ​​the third runner model unit 222 close to the end of the second runner model unit 221 gradually increases from the upper end of the third runner model unit 222 to the lower end of the third runner model unit 222. Preferably, the height of the third runner model unit 222 close to the end of the second runner model unit 221 is greater than or equal to twice the average width of the third runner model unit 222 close to the end of the second runner model unit 221. And the minimum cross-sectional area of ​​the third runner model unit 222 close to the end of the second runner model unit 221 is greater than or equal to the minimum cross-sectional area of ​​the first runner model subunit 2111. The end of the third runner model unit 222 away from the second runner model unit 221 is in a dovetail structure, and the end of the third runner model unit 222 away from the second runner model unit 221 is connected to the side of the inner runner model unit 31 away from the first runner model unit 211. The longitudinal cross-sectional area of ​​the end of the third runner model unit 222 away from the second runner model unit 221 gradually increases along the direction from the end of the third runner model unit 222 away from the second runner model unit 221 to the end of the third runner model unit 222 close to the second runner model unit 221.

[0076] The longitudinal cross-sectional area of ​​the second runner model unit 221 gradually decreases along the middle of the second runner model unit 221 toward the third runner model unit 222. The second runner model unit 221 matches the end of the third runner model unit 222 close to the second runner model unit 221. The cross-sectional area of ​​the second runner model unit 221 is greater than the sum of the maximum cross-sectional areas of the two ingate model units 31.

[0077] On the one hand, by adding the third runner model unit 222, it is expected to form a multi-stage filtering mechanism, thereby increasing the probability of slag inclusion being blocked and precipitated, so as to reduce the possibility of slag inclusion entering the casting cavity. On the other hand, it is expected to reduce the turbulence phenomenon in the flow of the molten metal through the complex structure of the third runner model unit 222, thereby improving the stability of the molten metal during the transition from the second runner to the ingate.

[0078] Embodiment 6

[0079] In order to further improve the slag blocking effect of the gating system. As Figure 4 shown, on the basis of the above Embodiment 5, in this embodiment, the filter screen model 4 is arranged at the lower end of the second runner model unit 221; the projection of the second runner model unit 221 on the upper end surface of the filter screen model 4 is denoted as the first projection; the first projection is located within the upper end surface of the filter screen model 4, and the distance between the edge of the upper end surface of the filter screen model 4 and the edge of the first projection is D; wherein, D > 3 mm.

[0080] Exemplarily, during the implementation process, the filter screen model 4 is arranged at the lower end of the second runner model unit 221. The projection of the second runner model unit 221 on the upper end surface of the filter screen model 4 is denoted as the first projection; the first projection falls within the upper end surface of the filter screen model 4, and the distance between the edge of the upper end surface of the filter screen model 4 and the edge of the first projection is D. Optionally, D > 3 mm. Preferably, D > 5 mm. The size of the filter screen model 4 is made larger than that of the second runner model unit 221, so as to achieve the purpose of improving the filtering effect of the filter screen on the slag inclusion in the molten metal.

[0081] Embodiment 7

[0082] In order to further improve the slag blocking effect of the gating system. As Figure 4 shown, on the basis of the above Embodiment 6, in this embodiment, a connecting groove 8 is arranged at the upper end of the third runner model 23; the lower end of the filter screen model 4 is connected to the connecting groove 8; the distance between the upper end surface of the filter screen model 4 and the notch of the connecting groove 8 is N; the depth of the connecting groove 8 is n; wherein, N < n.

[0083] Exemplarily, during the implementation process, a connecting groove 8 is arranged at the upper end of the third runner model 23. The lower end of the filter screen model 4 is connected to the connecting groove 8. The distance between the upper end surface of the filter screen model 4 and the notch of the connecting groove 8 is N. The depth of the connecting groove 8 is n, and N < n. Preferably, n = 3N, that is, 3 / 4 of the filter screen model 4 is connected in the connecting groove 8.

[0084] By embedding the filter mesh model 4 into the connecting groove 8, it is expected to ensure the sealing between the filter mesh model 4 and the third cross runner model 23, thereby reducing the risk of molten metal leaking from the connection between the filter mesh model 4 and the third cross runner model 23 or bypassing the filter mesh, thereby enhancing the slag blocking effect of the filter mesh.

[0085] Example 8

[0086] In order to further improve the slag blocking effect of the pouring system. Figure 4 As shown, on the basis of the above-mentioned embodiment 7, in this embodiment, the third runner model 23 includes a fourth runner model unit 231 and a fifth runner model unit 232; the connecting groove 8 is opened on the upper end surface of the fourth runner model unit 231; the fifth runner model unit 232 is connected to the side of the fourth runner model unit 231 away from the inner runner model unit 31; the end of the fifth runner model unit 232 away from the fourth runner model unit 231 is connected to the riser model 5; wherein, the cross-sectional area of ​​the fifth runner model unit 232 increases successively along the direction from the fourth runner model unit 231 to the riser model 5; and the minimum cross-sectional area of ​​the fifth runner model unit 232 is greater than or equal to the cross-sectional area of ​​the first straight runner model unit 11.

[0087] Exemplarily, during implementation, the third runner model 23 includes a fourth runner model unit 231 and a fifth runner model unit 232 .

[0088] The connection groove 8 is provided on the upper end surface of the fourth runner model unit 231. The projection of the fourth runner model unit 231 on the lower end surface of the filter mesh model 4 is recorded as the second projection, which is located inside the lower end surface of the filter mesh model 4, and the distance between the edge of the second projection and the lower end surface of the filter mesh model 4 is not less than 3 mm.

[0089] The fifth runner model unit 232 is connected to the side of the fourth runner model unit 231 away from the inner runner model unit 31, and one end of the fifth runner model unit 232 away from the fourth runner model unit 231 is connected to the riser model 5. The cross-sectional area of ​​the fifth runner model unit 232 increases in sequence from the fourth runner model unit 231 to the riser model 5. The minimum cross-sectional area of ​​the fifth runner model unit 232 is greater than or equal to the cross-sectional area of ​​the first straight runner model unit 11.

[0090] The fourth runner model unit 231 and the fifth runner model unit 232 form a more complex metal liquid flow path, in order to increase the probability of slag inclusion being blocked and precipitated, thereby reducing the possibility of slag inclusion entering the casting cavity.

[0091] Example 9

[0092] This embodiment provides a casting method, such as Figure 7 The casting method is used for the pouring system described in any one of Examples 1 to 8, and includes the following operations:

[0093] S100. Place the pouring system in the sand box;

[0094] S200. Fill the sand box with a moisture content of less than 3.6%, and compact the sand in the sand box to obtain a sand mold corresponding to the casting system; wherein the air permeability of the sand mold is greater than 110; when compacting the sand in the sand box, the upper box extrusion pressure of the sand box is 80-100N / cm2, and the lower box extrusion pressure of the sand box is 100-120N / cm2;

[0095] Exemplarily, during the implementation process, the sand box is filled with sand having a moisture content of less than 3.6%, and the sand in the sand box is compacted under the condition that the upper box extrusion pressure is 80-100N / cm2 and the lower box extrusion pressure is 100-120N / cm2. After the sand in the sand box is compacted, the pouring system is taken out to obtain a sand mold. The air permeability of the sand mold is greater than 110.

[0096] S300. Open a through hole at the exhaust needle on the sand mold;

[0097] S400. injecting molten metal at a temperature of 1450-1410° C. into the sand mold from the sprue on the sand mold until the molten metal overflows from the through hole;

[0098] For example, during the implementation, the molten metal at a temperature of 1450-1410°C is injected into the sand mold from the sprue on the sand mold, and the molten metal enters the mold cavity of the casting through the sprue, runner, ingates, filter screen, and riser until the molten metal fills the mold cavity and overflows from the through hole on the exhaust needle. The pouring time of the molten metal is no more than 10 seconds.

[0099] S500. Cooling the molten metal in the sand mold to obtain a cooling part;

[0100] S600. Perform cutting processing on the cooling part to obtain a casting.

[0101] Exemplarily, during the implementation process, the riser, sprue, and runner portions on the cooling member are cut off to obtain the desired casting.

[0102] During use, the molten metal enters the casting model 6 through the riser model 5, and flows from the thin-walled end of the casting model 6 to the thick-walled end of the casting model 6. It is expected that the thin-walled part of the casting model 6 will be filled with high-temperature molten metal first, and at the same time, the molten metal flows more smoothly, thereby reducing the risk of air entrainment and the probability of porosity defects.

[0103] In the sand mold, a through hole is opened on the end surface of the exhaust needle model 7 away from the casting model 6, so as to increase the exhaust of the mold cavity and reduce the air pressure in the mold cavity to reduce the probability of generating pore defects.

[0104] The casting method in this embodiment adopts measures such as controlling the flow direction of the molten metal, adding the exhaust needle model 7, restricting the water content of the sand, restricting the permeability of the sand mold, restricting the molding extrusion pressure, restricting the pouring temperature and pouring time, etc., in order to achieve the purpose of reducing the probability of porosity defects in the casting.

[0105] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. An integrated caliper casting system, characterized in that: include: A sprue model (1), a runner model assembly (2), an entrapment model (3), a filter mesh model (4), a riser model (5), a casting model (6), and a vent needle model (7) are sequentially arranged along the flow direction of the molten metal; The runner model assembly (2) comprises a first runner model (21), a second runner model (22) and a third runner model (23); the first runner model (21), the second runner model (22) and the third runner model (23) are sequentially arranged along the sprue model (1) in the direction of the riser model (5); the entrapment model (3) is arranged between the first runner model (21) and the second runner model (22); the filter screen model (4) is arranged between the second runner model (22) and the third runner model (23); Wherein, one end of the thin wall of the casting model (6) is connected to the riser model (5).

2. The pouring system according to claim 1, characterized in that: The sprue model (1) comprises a first sprue model unit (11), a second sprue model unit (12) and a third sprue model unit (13); The second sprue model unit (12) is connected to the lower end of the first sprue model unit (11), and the cross-sectional area of ​​the second sprue model unit (12) gradually increases from the upper end of the second sprue model unit (12) to the lower end of the second sprue model unit (12); The third sprue model unit (13) is connected to the lower end of the second sprue model unit (12); the cross-sectional area of ​​the third sprue model unit (13) gradually decreases from the upper end of the third sprue model unit (13) to the lower end of the third sprue model unit (13); and the diameter of the lower end surface of the third sprue model unit (13) is greater than or equal to the diameter of the upper end surface of the first sprue model unit (11).

3. The pouring system according to claim 2, characterized in that: The first runner model (21) includes two first runner model units (211); The two first cross runner model units (211) are arranged oppositely on two sides of the third straight runner model unit (13); The first runner model unit (211) comprises a first runner model subunit (2111) and a second runner model subunit (2112); The first runner model subunit (2111) is connected to the side wall of the third straight runner model unit (13); The second runner model subunit (2112) is connected to a side of the first runner model subunit (2111) away from the third straight runner model unit (13); Among them, the minimum cross-sectional area of ​​the second cross-runner model subunit (2112) is greater than the minimum cross-sectional area of ​​the first cross-runner model subunit (2111), and the sum of the minimum cross-sectional areas of the two first cross-runner model subunits (2111) is greater than the cross-sectional area of ​​the first straight runner model unit (11).

4. The pouring system according to claim 3, characterized in that: The ingrate model (3) includes two ingrate model units (31); The two ingate model units (31) are correspondingly arranged at the lower ends of the two second runner model units (221).

5. The pouring system according to claim 3, characterized in that: The second runner model (22) comprises a second runner model unit (221) and a third runner model unit (222); The second runner model unit (221) is arranged on a side of the ingrow model unit (31) away from the first runner model unit (211); The number of the third runner model units (222) is set to two, and the two third runner model units (222) are respectively arranged on both sides of the second runner model unit (221), and the two third runner model units (222) are respectively connected to the side of the two ingrown runner model units (31) away from the first runner model unit (211).

6. The pouring system according to claim 5, characterized in that: The filter screen model (4) is arranged at the lower end of the second runner model unit (221); The projection of the second runner model unit (221) on the upper end surface of the filter screen model (4) is recorded as the first projection; The first projection is located within the upper end surface of the filter mesh model (4), and the distance between the edge of the upper end surface of the filter mesh model (4) and the edge of the first projection is D; Among them, D>3mm.

7. The pouring system according to claim 6, characterized in that: The upper end of the third runner model (23) is provided with a connecting groove (8); The lower end of the filter mesh model (4) is connected to the connecting groove (8); The distance between the upper end surface of the filter mesh model (4) and the opening of the connecting groove (8) is N; the groove depth of the connecting groove (8) is n; wherein N<n.

8. The pouring system according to claim 7, characterized in that: The third runner model (23) includes a fourth runner model unit (231) and a fifth runner model unit (232); The connecting groove (8) is provided on the upper end surface of the fourth runner model unit (231); The fifth runner model unit (232) is connected to a side of the fourth runner model unit (231) away from the ingrate model unit (31); One end of the fifth runner model unit (232) away from the fourth runner model unit (231) is connected to the riser model (5); The cross-sectional area of ​​the fifth runner model unit (232) increases successively along the direction from the fourth runner model unit (231) to the riser model (5); and the minimum cross-sectional area of ​​the fifth runner model unit (232) is greater than or equal to the cross-sectional area of ​​the first straight runner model unit (11).

9. A casting method, characterized in that: The casting method is used for the pouring system according to any one of claims 1 to 8, comprising the following operations: Place the pouring system in the sand box; Filling the sand box with sand having a moisture content of less than 3.6%, and compacting the sand in the sand box to obtain a sand mold corresponding to the pouring system; wherein the air permeability of the sand mold is greater than 110; A through hole is opened at the exhaust needle on the sand mold; The molten metal at a temperature of 1450-1410°C is injected into the sand mold from the sprue on the sand mold until the molten metal overflows from the through hole; Cooling the molten metal in the sand mold to obtain a cooled part; The cooled part is cut away to obtain a casting.

10. The casting method according to claim 9, characterized in that: When compacting the sand in the sand box, the extrusion pressure of the upper box of the sand box is 80-100N / cm2, and the extrusion pressure of the lower box of the sand box is 100-120N / cm2.

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