Sand casting mold for water pump shell

Abstract

The utility model relates to the technical field of casting, and provides a water pump shell sand casting mould which comprises a mould plate, a mould sample, a straight pouring gate, a dead head, an inner pouring gate, a concave positioning part, a loam core head, a transverse pouring gate and a convex positioning part, the mold plate comprises a mold plate concave surface and a mold plate convex surface, the two molds are arranged on the mold plate concave surface, the sprue, the two risers and the two ingates are all arranged on the mold plate concave surface, the number of the risers and the number of the ingates are both two, and the number of the mold plates is two. The mold has the beneficial effects that the two molds are distributed diagonally, when peripheral molding sand is injected, each mold cannot block peripheral sand injection of the other mold, the peripheral molding sand of each mold can be injected firmly, the compaction rate is good, and the hardness of the molding sand meets the molding requirement, so that after the compaction rate of the molding sand is improved, the molding sand can resist extrusion of the molten iron when the molten iron is poured, and the molding quality is improved. No matter in any direction around the blank, the blank does not swell, and the product quality is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a sand casting mould for a water pump casing. Background Art

[0002] Sand casting is a casting method that produces castings in sand molds. WQ (D) sewage and sludge submersible electric pumps are widely used in industry, agriculture, mining, municipal environmental protection and other places. They are ideal equipment for pumping muddy water, domestic sewage and solid particles such as short fibers, paper scraps, mud and sand, as well as rural irrigation and drainage. The casing is the main part of the sewage and sludge submersible electric pump. It is a hollow cylindrical tube in the middle. There are several evenly distributed reinforcing ribs distributed on the outer circle. The ratio of height to diameter is large. It is generally made of cast iron and sand casting. Because there are several evenly distributed reinforcing ribs, when designing the casting mold, if the mold is parted from the plane passing through the axis, although the mold height is not high, the reinforcing ribs protruding from the plane are not all perpendicular to the parting surface, and cannot be demolded during molding, so it cannot be molded. Therefore, it is necessary to design a parting from the horizontal end face of the cylindrical tube. Several evenly distributed reinforcing ribs are perpendicular to the parting surface and do not affect the demolding during molding, so molding is possible. However, with such a mold structure design, the entire product shape is either located entirely in the upper sand box or entirely in the lower sand box, and their heights exceed the maximum height dimension of the Xindong Line automatic molding machine. In order to solve this problem, a casting mold structure that uses concave and convex parting to produce ultra-high horizontal static pressure line products can be designed to solve this problem, and the original manual production can be transferred to the Xindong Line automated machine production. The patent "A horizontal static pressure line casting mold with concave and convex parting" can be seen, see the authorized patent number ZL 2019 2 0533685.4.

[0003] Later, it was found in batch production that some parts of the outer circle of some blanks were unevenly bulged and the outer circle was not round. Since the process during machining was to clamp the outer circle with three jaws, after the outer circle bulged, the axis of the machine shell did not coincide with the axis of the lathe spindle at the part where the outer circle was not bulged by the three-jaw clamp, and the material was biased during processing. When the four holes of the surrounding holes were drilled with the processed stop, the holes were biased, which caused the product scrap rate and the order could not be delivered in time. After analysis, the reason was that the concave mold was concave 100mm. When the sand was shot, there were four molds in one mold. The back of the two adjacent patterns, no matter from which direction the sand was shot from all around, was partially blocked by the pattern, resulting in loose sand shooting. After molding, the compaction rate of the sand here was low. When pouring molten iron, it bulged to one side of the sand under the extrusion of the molten iron, resulting in the blank being out of round. The scrap rate of the material after processing was high. In view of this, this application is specially proposed. Utility Model Content

[0004] The present application proposes a sand casting mold for a water pump casing to solve the problem in the prior art that the concave mold is 100mm concave, and when the sand is shot, there are 4 molds in one mold. The back of two adjacent patterns, no matter from which direction the sand is shot, is partially blocked by the patterns, resulting in loose sand shooting. After the molding, the compaction rate of the sand here is low. When pouring molten iron, the sand bulges to one side under the extrusion of the molten iron, resulting in the blank being out of round. The scrap rate of the material after processing is high. Different milling cutters are used to process different planes separately, requiring secondary clamping, low processing efficiency, large repeated positioning errors, and difficult to ensure the accuracy of the angle. This will cause the coupling elbow base and the hook to get stuck after installation, and even cause the water pump to be unable to lift during maintenance. The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A sand casting mold for a water pump casing, comprising a mold plate, a pattern, a sprue, a riser, an inner gate, a concave positioning, a mud core head, a horizontal runner and a convex positioning;

[0006] The mold plate includes a concave surface and a convex surface of the mold plate, the pattern is arranged on the concave surface of the mold plate, the number of the patterns is two, the sprue, the riser and the ingrowth are all arranged on the concave surface of the mold plate, the number of the riser and the ingrowth are both two, the two ingrowths of the two patterns are respectively connected with the two patterns and the risers, the concave positioning is symmetrically arranged on the concave surface of the mold plate, the two mud core heads are arranged on the convex surface of the mold plate, the mud core heads and the patterns are matched with each other, the cross runner is arranged in the middle position of the convex surface of the mold plate, the sprue is connected with the cross runner, the convex positioning is symmetrically arranged on both sides of the convex surface of the mold plate, and the convex positioning is matched with the concave positioning.

[0007] Preferably, a plurality of locking holes are evenly and symmetrically arranged at the edge positions on the upper and lower sides of the concave surface of the template.

[0008] Preferably, a plurality of threaded holes are respectively provided at the edge positions on the left and right sides of the concave surface of the template.

[0009] Preferably, positioning holes are evenly and symmetrically arranged at the edge positions on both sides of the upper and lower sides of the convex surface of the template.

[0010] Preferably, the patterns are diagonally distributed on the concave surface of the template.

[0011] Preferably, the number of the locking holes is six.

[0012] Preferably, the concave surface of the template and the convex surface of the template are connected and matched using a concave-convex structure.

[0013] Compared with the prior art, the beneficial effects of the utility model include: the two patterns are diagonally distributed, and when the molding sand is injected around them, each pattern will not block the injection of sand around the other pattern, and the molding sand around each pattern can be injected solidly, with a good compaction rate, and the hardness of the molding sand meets the modeling requirements. In this way, after the compaction rate of the molding sand is improved, when pouring molten iron, the molding sand can withstand the extrusion of the molten iron, and no bulging will occur around the blank in any direction, and the product quality is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the concave surface of the mold plate of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the convex surface of the mold plate of the utility model;

[0016] Figure 3 It is a schematic diagram of the state of mold closing of the utility model;

[0017] Figure 4 It is a projection schematic diagram of the concave surface of the mold plate of the utility model;

[0018] Figure 5 It is a projection diagram of the convex surface of the template of the utility model;

[0019] In the figure: 1. mold plate; 2. pattern; 3. sprue; 4. riser; 5. ingrown; 6. locking hole; 7. concave positioning; 8. threaded hole; 9. mud core head; 10. cross runner; 11. convex positioning; 12. positioning hole. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Please see attached Figure 1-5 A water pump casing sand casting mold, comprising a mold plate 1, a pattern 2, a sprue 3, a riser 4, an inner gate 5, a concave positioning 7, a mud core head 9, a horizontal runner 10 and a convex positioning 11;

[0024] The mold plate 1 includes a concave surface of the mold plate 1 and a convex surface of the mold plate 1. The concave surface of the mold plate 1 and the convex surface of the mold plate 1 are connected and matched with a concave-convex structure. The patterns 2 are diagonally distributed and arranged on the concave surface of the mold plate 1. The number of patterns 2 is two. The sprue 3, the riser 4 and the ingrown 5 are all arranged on the concave surface of the mold plate 1. The number of the riser 4 and the ingrown 5 are both two. The two ingrowns 5 of the two patterns 2 are respectively connected with the two patterns 2 and the risers 4. The concave positioning 7 is symmetrically arranged on the concave surface of the mold plate 1. Two mud core heads 9 are arranged on the convex surface of the mold plate 1. The mud core heads 9 and the patterns 2 are matched with each other. The cross runner 10 is arranged in the middle position of the convex surface of the mold plate 1. The sprue 3 and the cross runner 10 are connected. The convex positioning 11 is symmetrically arranged on both sides of the convex surface of the mold plate 1, and the convex positioning 11 is matched with the concave positioning 7.

[0025] With the above technical solution, the mold plate 1 is the main skeleton part of the mold, and adopts a relatively deep concave-convex structure design. While reducing the height of the upper sand box casting mold, it is also convenient for the accurate positioning of the upper sand box casting mold and the lower sand box casting mold after molding, and can prevent the upper casting mold and the lower casting mold from misaligning after the mold is withdrawn; the mold 2 is the part of the mold that forms the product blank, which is distributed in a diagonal state, and the two inner runners 5 are connected respectively, and the straight runner 3 is connected to the pouring cup of the automatic molding machine. It is the channel for the molten iron to enter when pouring, and is connected to the cross runner 10. The two risers 4 are divided into The two core heads 9 correspond to the two molds 2 respectively, and their function is to facilitate the positioning of the two cores when the cores are lowered after molding. The runners 10 are respectively connected to the sprue 3 and the two risers 4, and the molten iron from the sprue 33 is respectively introduced into the two risers 4. The two convex positioning heads 11 are located on the mold plate 1 and are aligned with the two concave positioning heads 7 respectively, and their function is to ensure good positioning of the upper mold and the lower mold.

[0026] In some embodiments, a plurality of locking holes 6 are evenly and symmetrically arranged at the edge positions on the upper and lower sides of the concave surface of the template 1, and the number of the locking holes 6 is six.

[0027] With the above technical solution, after the mold is positioned, six bolts are placed in the locking holes 6 to lock the mold.

[0028] In some embodiments, a plurality of threaded holes 8 are respectively disposed at the edge positions of the left and right sides of the concave surface of the template 1 .

[0029] By adopting the above technical solution, when loading and unloading the mold, two eye bolts are screwed into the threaded hole 8 to facilitate the insertion of the hook of the iron chain to lift the mold.

[0030] In some embodiments, positioning holes 12 are evenly and symmetrically arranged at the edges of the upper and lower sides of the convex surface of the template 1.

[0031] By adopting the above technical solution, when installing the mold, the positioning hole 12 is aligned with the positioning pin on the mold frame, and then the mold is positioned on the positioning pin on the mold frame.

[0032] Working method:

[0033] Step 1: At the mold placement location, use two eyebolts of corresponding specifications to tighten them into the two threaded holes 88 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.

[0034] Step 2: Align the two positioning holes 1212 of the mold with the positioning pins on the mold frame to position the mold.

[0035] Step 3: Use six bolts of corresponding specifications to tighten them into the six locking holes 66 respectively to fix the mold.

[0036] Step 4: Start the automatic line molding machine for automatic molding.

[0037] Step 5, the molding sand is shot from all sides to the two patterns 22. Because the two patterns 22 are diagonally distributed, when the molding sand is shot in, each pattern 22 will not block the sand shot from all sides of another pattern 22. The molding sand around each pattern 2 can be shot solid, the compaction rate is good, and the molding sand hardness meets the modeling requirements.

[0038] Step 6: After molding one box, the mold automatically withdraws and the core-setting operation is carried out. The core head 9 of a core is placed on the core head 99 in the cavity of the lower casting mold, aligned, and then the other core is also placed.

[0039] Step 7. After placing, start the molding machine with both hands, the upper mold falls down, and aligns with the lower mold to complete the molding of one box.

[0040] Step 8: After the molding of this box is completed, the entire mold begins to fall and is placed on the sliding table.

[0041] Step 9, carry out the next box of molding sand shooting, mud core placement, box closing, and placement on the sliding table in sequence.

[0042] Step 10: Carry out preparation work before pouring. When the number of shapes is enough to cover the weight of a bag of molten iron, deliver a bag of molten iron, and pour it into the ladle of the automatic pouring machine after slag removal and temperature measurement.

[0043] Step 11, slowly pour the molten iron in the ladle into the pouring cup of the casting. At this time, the molten iron flows through the pouring cup to the sprue 33, the runner 1010, and then splits into two paths, respectively flowing into the cavity where the pattern 22 is located through the riser 44 and the ingrowth 55, filling the two cavities respectively. After cooling, all the cavities of the two patterns 22 form two blanks.

[0044] 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 water pump casing sand casting mold, characterized in that: It includes a mold plate (1), a pattern (2), a sprue (3), a riser (4), an ingates (5), a concave positioning (7), a mud core head (9), a cross runner (10) and a convex positioning (11); The mold plate (1) comprises a concave surface of the mold plate (1) and a convex surface of the mold plate (1); the pattern (2) is arranged on the concave surface of the mold plate (1); the number of the patterns (2) is two; the sprue (3), the riser (4) and the ingrow (5) are all arranged on the concave surface of the mold plate (1); the number of the riser (4) and the ingrow (5) are both two; the two ingrows (5) of the two patterns (2) are respectively connected to the two patterns (2) and the riser (4). The concave positioning (7) is symmetrically arranged on the concave surface of the template (1), the two mud core heads (9) are arranged on the convex surface of the template (1), the mud core heads (9) and the pattern (2) are matched with each other, the cross runner (10) is arranged in the middle position of the convex surface of the template (1), the straight runner (3) and the cross runner (10) are connected, and the convex positioning (11) is symmetrically arranged on both sides of the convex surface of the template (1), and the convex positioning (11) and the concave positioning (7) are matched with each other.

2. The water pump casing sand casting mold according to claim 1, characterized in that: A plurality of locking holes (6) are evenly and symmetrically arranged at the edges of the upper and lower sides of the concave surface of the template (1).

3. The water pump casing sand casting mold according to claim 1, characterized in that: A plurality of threaded holes (8) are respectively provided at the edge positions of the left and right sides of the concave surface of the template (1).

4. The water pump casing sand casting mold according to claim 1, characterized in that: Positioning holes (12) are evenly and symmetrically arranged at the edges of the upper and lower sides of the convex surface of the template (1).

5. The water pump casing sand casting mold according to claim 1, characterized in that: The patterns (2) are distributed diagonally on the concave surface of the template (1).

6. The water pump casing sand casting mold according to claim 2, characterized in that: The number of the locking holes (6) is six.

7. The water pump casing sand casting mold according to claim 1, characterized in that: The concave surface of the template (1) and the convex surface of the template (1) are connected and matched using a concave-convex structure.

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