A high carbon equivalent HT250 motor seat mold

Abstract

The utility model relates to the technical field of castings, and provides a high carbon equivalent HT250 motor seat mold, comprising a mold plate upper surface, a mold plate lower surface, an upper pattern, a lower pattern, a sprue, a cross runner, a large end riser, a small end riser, a large end endocastor, a small end endocastor, an exhaust plate and a positioning locking mechanism, wherein the upper pattern is arranged at a middle position on the mold plate upper surface, the lower pattern and the cross runner are both arranged on the mold plate lower surface, the mold plate upper surface and the mold plate lower surface are connected by a positioning locking mechanism, the sprue, the large end riser and the small end riser are arranged on one side of the mold plate upper surface; by arranging the large end riser and the small end riser, and the large end riser and the small end riser are higher than the upper pattern and the lower pattern for forming a blank, so that the molten iron in a liquid state at this position in the mold solidifies the latest, so that the molten iron can be provided for the solidification shrinkage of the blank to provide molten iron shrinkage compensation, thus preventing the HT250 casting from shrinkage cavities, and reducing the production cost because no alloy elements are added.

Description

Technical Field

[0001] The utility model relates to the technical field of castings, in particular to a high carbon equivalent HT250 motor seat mould. Background Art

[0002] The water pump motor seat is an important part of the water pump. It is generally made of gray cast iron HT200 and sand cast. Gray cast iron has low production cost, relatively simple casting process, good comprehensive performance, good shock absorption, thermal conductivity, friction reduction and low notch sensitivity. It is an ideal material. However, with the development of water pumps towards high pressure and large size, higher requirements are placed on the mechanical properties of water pump motor seat castings. The tensile strength of the original HT200 castings can no longer meet the requirements and the tensile strength needs to be improved. Therefore, it is necessary to produce HT250 water pump motor seat castings.

[0003] Unlike the production of HT200, the traditional process for producing HT250 castings is to reduce the carbon equivalent. Generally, the carbon equivalent CE value is 3.5-3.8, which is a relatively low carbon equivalent, and alloying elements need to be added to improve the tensile strength. However, reducing the carbon equivalent to improve the tensile strength will bring many unfavorable factors. Because the carbon equivalent is far away from the eutectic point, the casting process performance deteriorates, the white cast metal tendency increases, the processing performance deteriorates, the processing efficiency decreases, the stress is large, and cracks are easily generated. The molten iron shrinks greatly, and shrinkage cavities and shrinkage are easily generated, causing leakage. In addition, the addition of alloying elements will cause a sharp increase in production costs. In view of this, this application is specially proposed. Utility Model Content

[0004] This application proposes a high carbon equivalent HT250 motor seat mold to solve the technical problems in the prior art that reducing the carbon equivalent leads to poor casting process performance, increased white cast tendency, poor processing performance, reduced processing efficiency, high stress, easy cracking, large iron liquid shrinkage, easy shrinkage, shrinkage, leakage, and increased alloy elements, which will cause a sharp increase in production costs. The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A high carbon equivalent HT250 motor seat mold, including a template top, a template bottom, an upper pattern, a lower pattern, a straight runner, a cross runner, a large end riser, a small end riser, a large end endocastor, a small end endocastor, an exhaust plate and a positioning locking mechanism, the upper pattern is arranged in the middle position of the template top, the lower pattern and the cross runner are both arranged on the template bottom, the template top and the template bottom are connected by a positioning locking mechanism, the straight runner, the large end riser, and the small end riser are arranged on one side of the template top, the straight runner is located in the middle of the large end riser and the small end riser, the straight runner is connected with the cross runner, the large end riser and the small end endocastor are respectively connected, the exhaust plate is arranged on the other side of the template top away from the straight runner, and the small end endocastor is arranged on the template at a position close to the small end riser.

[0006] Preferably, the positioning and locking mechanism includes a locking hole, a threaded hole and a positioning hole, the locking holes are evenly spaced on the upper and lower sides of the template and the lower side of the template, the positioning holes are symmetrically arranged on the left and right sides of the template and the lower side of the template, the threaded holes are arranged on the template and the lower side of the template, and the threaded holes are located in the middle of the two positioning holes.

[0007] Preferably, the cross runner is connected to the straight runner and the large-end ingrate and the small-end ingrate respectively.

[0008] Preferably, the large-end riser and the small-end riser are both conical.

[0009] Preferably, the upper surface of the template and the lower surface of the template are connected with each other by a concave-convex structure.

[0010] Preferably, the exhaust sheet is rectangular and has a thickness of 0.4-0.6 mm.

[0011] Preferably, the top surface of the template and the bottom surface of the template are respectively provided with six locking holes, and the locking holes are connected by bolts.

[0012] Compared with the prior art, the beneficial effects of the utility model include: by setting a large-end riser and a small-end riser, and the large-end riser and the small-end riser are higher than the upper mold and the lower mold for forming the blank, the molten iron in the liquid state at this location in the mold solidifies the latest, so that molten iron can be provided to compensate for the solidification shrinkage of the blank, which can prevent shrinkage holes from occurring in HT250 castings, and since no alloy elements are added, the production cost is reduced, the production operation is relatively simple, and the environmental pollution is less. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a structural schematic diagram of the utility model template;

[0014] Figure 2 It is a schematic diagram of the structure below the template of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the small end ingates of the utility model;

[0016] In the figure: 1. Top of the mold plate; 101. Bottom of the mold plate; 2. Upper mold; 3. Lower mold; 4. Straight runner; 5. Horizontal runner; 6. Large end riser; 7. Small end riser; 8. Large end ingrown; 9. Small end ingrown; 10. Exhaust plate; 11. Locking hole; 12. Threaded hole; 13. Positioning hole. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0020] Please see attached Figure 1-3A high carbon equivalent HT250 motor seat mold, including a mold plate top 1, a mold plate bottom 101, an upper pattern 2, a lower pattern 3, a sprue 4, a runner 5, a large end riser 6, a small end riser 7, a large end ingrate 8, a small end ingrate 9, an exhaust plate 10 and a positioning locking mechanism, the upper pattern 2 is arranged in the middle of the mold plate top 1, the lower pattern 3 and the runner 5 are both arranged on the mold plate bottom 101, and the mold plate top 1 and the mold plate bottom 101 are positioned by a positioning The locking mechanism is connected, the straight runner 4, the large end riser 6, and the small end riser 7 are arranged on one side of the upper surface 1 of the mold plate, the straight runner 4 is located in the middle of the large end riser 6 and the small end riser 7, the straight runner 4 is connected with the cross runner 5, the large end riser 6 and the small end riser 7 are respectively connected with the cross runner 5, the large end endogate 8 and the small end endogate 9, the exhaust plate 10 is arranged on the other side of the upper surface 1 of the mold plate away from the straight runner 4, and the small end endogate 9 is arranged on the mold plate near the small end riser 7.

[0021] In this embodiment, the upper surface 1 of the mold plate and the lower surface 101 of the mold plate are the main skeleton parts of the mold. The upper surface 1 of the mold plate and the lower surface 101 of the mold plate are connected by a concave-convex structure to facilitate the positioning of the upper box molding sand and the lower box molding sand after molding. The upper mold 2 is the upper mold part that forms the blank, and the lower mold 3 is the lower mold part that forms the blank. The straight runner 4 is connected to the pouring cup of the automatic molding machine, and is the channel through which the molten iron begins to enter during pouring. It is connected to the cross runner 5. The large end riser 6 and the small end riser 7 are respectively conical in shape, which is convenient for demolding during molding. They are respectively connected to the cross runner 5 and the large end ingrown runner 8 and the small end ingrown runner 9, and are the last part where the molten iron solidifies, which can compensate for the shrinkage of the casting. The cross runner 5 is respectively connected to the straight runner 4 and the large end ingrown runner 8 and the small end ingrown runner 9, and introduces the molten iron from the straight runner 4 into the large end ingrown runner 8 and the small end ingrown runner 9.

[0022] In some embodiments, the positioning and locking mechanism includes a locking hole 11, a threaded hole 12 and a positioning hole 13. The locking holes 11 are evenly spaced on the upper and lower sides of the template top 1 and the template bottom 101. There are six locking holes 11 on the template top 1 and the template bottom 101 respectively. The locking holes 11 are connected by bolts. The positioning holes 13 are symmetrically arranged on the left and right sides of the template top 1 and the template bottom 101 respectively. The threaded holes 12 are respectively arranged on the template top 1 and the template bottom 101, and the threaded holes 12 are located in the middle of the two positioning holes 13.

[0023] In this embodiment, the six locking holes 11 are used to place six bolts to lock the top 1 and the bottom 101 of the mold plate after the mold is positioned. The two threaded holes 12 are used to screw in two lifting eye bolts to facilitate the insertion of the hook of the iron chain during mold loading and unloading, so as to lift the locked top 1 and the bottom 101 of the mold plate. The four positioning holes 13 are used to position the mold on the positioning pins on the mold frame during mold loading.

[0024] In some embodiments, the exhaust sheet 10 is rectangular and has a thickness of 0.4-0.6 mm.

[0025] In this embodiment, the exhaust sheet 10 plays an exhaust role.

[0026] Working steps:

[0027] S1: At the mold placement location, use two eyebolts of corresponding specifications to tighten them into the two threaded holes 12 respectively, insert the hook of the iron chain and fix it, and use the crane to lift the mold to the mold rack at the automatic line molding location;

[0028] S2: Align the two positioning holes 13 of the mold with the positioning pins on the mold frame to position the mold;

[0029] S3: Use six bolts of corresponding specifications to tighten them into the six locking holes 11 respectively to fix the mold;

[0030] S4: Start the automatic line molding machine to perform molding and core setting;

[0031] S5: Carry out preparation work before pouring. When the number of molds is enough for one bag, deliver a bag of molten iron with the pre-furnace composition of C: 3.65%, Si: 1.63%, Mn: 0.87%, P0.04%, S≤0.02%, and pour it into the automatic pouring machine ladle to which 0.15% silicon-barium inoculant has been added;

[0032] S6: Slowly pour the molten iron from the ladle into the pouring cup of the sand mold;

[0033] S7: At this time, the molten iron flows into the sprue 4, the runner 5, the large end riser 6, the small end riser 7 through the pouring cup, and flows into the upper mold 2 and the lower mold 3 through the large end ingrate 8 and the small end ingrate 9 respectively;.

[0034] S8: After pouring a box, the molten iron in the sand mold gradually solidifies, and the upper mold 2 and the lower mold 3 shrink, continuously absorbing the molten iron from the large end riser 6 and the small end riser 7 for shrinkage compensation. Since the large end riser 6 and the small end riser 7 are higher than the upper mold 2 and the lower mold 3 that form the blank, the molten iron there is in a liquid state at this time and solidifies the latest. Therefore, it can provide molten iron for shrinkage compensation of the solidification shrinkage of the blank, thereby preventing shrinkage cavities from occurring in HT250 castings.

[0035] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A high carbon equivalent HT250 motor seat mold, characterized in that: The invention comprises a mold plate top (1), a mold plate bottom (101), an upper pattern (2), a lower pattern (3), a sprue (4), a runner (5), a large end riser (6), a small end riser (7), a large end endocastor (8), a small end endocastor (9), an exhaust plate (10) and a positioning locking mechanism, wherein the upper pattern (2) is arranged at a middle position of the mold plate top (1), the lower pattern (3) and the runner (5) are both arranged on the mold plate bottom (101), the mold plate top (1) and the mold plate bottom (101) are connected via a positioning locking mechanism, the sprue (4), the large end riser (6), the small end riser (7), the large end endocastor (8), the small end endocastor (9), an exhaust plate (10) and a positioning locking mechanism. 6), the small end riser (7) is arranged on one side of the upper surface (1) of the mold plate, the sprue (4) is located in the middle of the large end riser (6) and the small end riser (7), the sprue (4) is connected with the cross runner (5), the large end riser (6) and the small end riser (7) are respectively connected with the cross runner (5), the large end endocastor (8) and the small end endocastor (9), the exhaust plate (10) is arranged on the other side of the upper surface (1) of the mold plate away from the sprue (4), and the small end endocastor (9) is arranged on the mold plate near the small end riser (7).

2. A high carbon equivalent HT250 motor seat mold according to claim 1, characterized in that: The positioning and locking mechanism comprises a locking hole (11), a threaded hole (12) and a positioning hole (13); the locking holes (11) are evenly spaced and arranged on the upper and lower sides of the template upper surface (1) and the template lower surface (101); the positioning holes (13) are symmetrically arranged on the left and right sides of the template upper surface (1) and the template lower surface (101); the threaded holes (12) are arranged on the template upper surface (1) and the template lower surface (101); and the threaded holes (12) are located in the middle of the two positioning holes (13).

3. A high carbon equivalent HT250 motor seat mold according to claim 1, characterized in that: The cross runner (5) is respectively connected to the straight runner (4) and the large end ingrown runner (8) and the small end ingrown runner (9).

4. The high carbon equivalent HT250 motor seat mold according to claim 1, characterized in that: The large end riser (6) and the small end riser (7) are both conical.

5. The high carbon equivalent HT250 motor seat mold according to claim 1, characterized in that: The upper surface (1) of the template and the lower surface (101) of the template are connected by a concave-convex structure.

6. The high carbon equivalent HT250 motor seat mold according to claim 1, characterized in that: The exhaust sheet (10) is rectangular and has a thickness of 0.4-0.6 mm.

7. The high carbon equivalent HT250 motor seat mold according to claim 2, characterized in that: The template upper surface (1) and the template lower surface (101) are respectively provided with six locking holes (11), and the locking holes (11) are connected with bolts.

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