CN220049951U - Mud core die for impeller of water pump - Google Patents

Abstract

The utility model relates to the technical field of casting molds, and provides a water pump impeller loam core mold, which comprises: bottom plate, fly leaf, spring, lower mould side forms, lower mould, ejector pin, heating pipe, go up mould side forms and positioning mechanism, the spring sets up at the bottom plate top, the fly leaf sets up the spring top, the ejector pin sets up on the fly leaf, the lower mould sets up on the fly leaf, lower mould side forms symmetry sets up the lower mould both sides, be equipped with two pattern die cavities of making the loam core on the lower mould. Through respectively setting up a cylinder recess in the middle of two die sample die cavities of last mould and lower mould, this cylinder recess can form the convex cylinder of tectorial membrane sand mud core, when molding, put into the die cavity with this tectorial membrane sand mud core, treat the mould closing pouring after, the fashioned impeller blank shaft hole position has eliminated hot joint position because of the convex cylinder of tectorial membrane sand mud core, changes hollow in the middle of by the entity, reaches the wall thickness even, consequently difficult shrinkage cavity defect appears.

Description

Mud core die for impeller of water pump

Technical Field

The utility model relates to the technical field of casting molds, in particular to a water pump impeller loam core mold.

Background

The water pump is a mechanism for delivering or pressurizing liquid, the centrifugal pump is the most common water pump, and the impeller is a key part of the centrifugal pump, and the water is lifted to a high place under the action of centrifugal force generated by high-speed rotation of the impeller.

The centrifugal pump impeller is made of iron casting, and is mostly a closed impeller, and consists of a front cover plate, a plurality of blades and a rear cover plate. For the centrifugal pump impeller with smaller overall dimension, an automatic line machine is adopted for modeling, and the mud core forming the blade is the mud core of the precoated sand machine. After the centrifugal pump impeller is processed, the diameter of the middle shaft hole is basically equal to the depth of the middle shaft hole, and the middle small hole cannot be directly cast by a die, so that the shaft hole part is a solid body, a hot junction is easy to form at the position, shrinkage after molten iron solidification cannot be fed, and shrinkage hole defects are easy to generate. At present, a feeding head is arranged at the position, so that the casting temperature is reduced, the shrinkage cavity proportion is somewhat reduced, but the blade is thinner, the casting temperature is reduced, and the rejection of cold insulation is increased more. In view of this, the present utility model has been made.

Disclosure of Invention

The utility model provides a water pump impeller loam core die, which aims to solve the technical problems that in the prior art, a feeding head is arranged at a machining middle shaft hole of a centrifugal pump impeller, the casting temperature is reduced, the proportion of shrinkage holes is somewhat reduced, but the blades are thinner, the casting temperature is reduced, and more cold insulation is scrapped. The technical aim of the utility model is realized by the following technical scheme:

a water pump impeller core mold comprising: a bottom plate, a movable plate, a spring, a lower die side die, a lower die, a push rod, a heating pipe, an upper die side die and a positioning mechanism,

the spring sets up at the bottom plate top, the fly leaf setting is in the spring top, the ejector pin sets up on the fly leaf, the lower mould sets up on the fly leaf, lower mould side form symmetry sets up the lower mould both sides, be equipped with two die cavities of making the clay core on the lower mould, die cavity central point puts and all is equipped with the cylinder recess, die cavity is equipped with a plurality of blades around cylinder recess circumference, the interval department of blade all is equipped with a plurality of first through-holes, the ejector pin with first through-hole corresponds the cooperation, go up the mould with connect through positioning mechanism between the lower mould, go up mould side form symmetry setting and be in go up the mould both sides, go up the mould top and run through and open two sand inlet holes.

Preferably, the positioning mechanism comprises positioning holes and positioning pins, the positioning holes are respectively formed in the diagonal positions of the lower die, the positioning pins are arranged in the diagonal positions of the bottom of the upper die, and the positioning pins are matched with the positioning holes.

Preferably, the lower die is transversely provided with a plurality of second through holes in a penetrating mode, and heating pipes are arranged in the second through holes.

Preferably, the number of blades is 7.

Preferably, the number of the ejector rods and the number of the first through holes are 28.

Preferably, the upper die and the upper die side die are connected through welding.

Preferably, the lower die and the lower die side die are connected through welding.

Preferably, the number of springs is 4.

Compared with the prior art, the utility model has the following beneficial effects: through respectively setting up a cylinder recess in the middle of two die sample die cavities of last mould and lower mould, this cylinder recess can form the convex cylinder of tectorial membrane sand mud core, when the molding, put into the die cavity with this tectorial membrane sand mud core, treat the mould closing pouring after, fashioned impeller blank shaft hole position has eliminated hot joint position because of the convex cylinder of tectorial membrane sand mud core, changes hollow in the middle of by the entity, reaches the wall thickness even, consequently is difficult for appearing the shrinkage cavity defect, so can prevent that the shrinkage cavity defect from appearing in the centrifugal pump impeller, promotes the product percent of pass.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the assembly of the upper and lower dies of the present utility model;

FIG. 3 is a schematic structural view of a coated sand core of an impeller made in accordance with the present utility model;

in the figure: 1. a bottom plate; 2. a movable plate; 3. a spring; 4. a lower die side die; 5. a lower die; 6. a push rod; 7. heating pipes; 8. an upper die; 9. an upper die side die; 10. a positioning pin; 11. impeller precoated sand core.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Referring to fig. 1-3, a water pump impeller core mold, comprising: a bottom plate 1, a movable plate 2, a spring 3, a lower die side die 4, a lower die 5, a push rod 6, a heating pipe 7, an upper die 8, an upper die side die 9 and a positioning mechanism,

the spring 3 sets up at bottom plate 1 top, the quantity of spring 3 is 4, fly leaf 2 sets up at spring 3 top, ejector pin 6 sets up on fly leaf 2, lower mould 5 sets up on fly leaf 2, the welding of lower mould side forms 4 symmetry sets up in lower mould 5 both sides, be equipped with two pattern die cavities of making the clay core on the lower mould 5, pattern die cavity central point puts and all is equipped with the cylinder recess, pattern die cavity is equipped with 7 blades around cylinder recess circumference, the interval department of blade all is equipped with 2 first through-holes, ejector pin 6 corresponds the cooperation with first through-hole, the quantity of ejector pin 6 and first through-hole is 28, be connected through positioning mechanism between upper mould 8 and the lower mould 5, upper mould side forms 9 symmetry welding set up in upper mould 8 both sides, upper mould 8 top runs through and opens two sand feed through.

In some embodiments, the lower die 5 is provided with a plurality of second through holes transversely penetrating through, and the heating pipes 7 are arranged in the second through holes.

According to the technical scheme, the ejector rod 6 passes through the first through hole, the movable rod and the lower die 5 are assembled, then the movable plate 2 is pressed on the spring 3 until the lower die side die 4 is attached to the bottom plate 1, at the moment, the ejector rod 6 respectively passes through the first through hole, then the upper die 8 and the lower die 5 are assembled through positioning, then the assembled die is placed on a workbench of a core shooter, two ends of the heating pipe 7 are respectively connected with a wire of the core shooter, equipment is started, precoated sand is respectively introduced into two sand outlet holes of the core shooter and two sand inlet through holes at the top of the upper die 8, enters into two pattern cavities of the upper die 8 and the lower die 5, and is heated, kept warm and kept pressure for a set time, and starts to be lifted to form a convex cylindrical groove in the middle of the two pattern cavities of the lower die 5, the convex cylindrical groove can form a convex cylindrical core of the precoated sand core, and the precoated sand core is placed into the hollow cylindrical cavity when the impeller, after the impeller is poured into the pouring box, the hollow core cavity is easily reduced, the defect of the hollow core is overcome, and the defect of the hollow core is easily occurring.

In some embodiments, the positioning mechanism comprises positioning holes and positioning pins 10, the positioning holes are respectively formed in the diagonal positions of the lower die 5, the positioning pins 10 are arranged in the diagonal positions of the bottom of the upper die 8, and the positioning pins 10 are matched with the positioning holes.

By adopting the technical scheme, the positioning pin 10 penetrates through the positioning hole to be connected and matched, so that the assembly and the accurate positioning of the upper die 8 and the lower die 5 are realized.

The steps are as follows:

step 1, taking a fixed movable plate 2 with 28 ejector rods 6, respectively aligning the 28 ejector rods 6 with 28 first through holes between adjacent blades of two patterns of a turned lower die 5, and inserting and matching the movable plate with the 28 first through holes from the back;

step 2, turning over the assembled movable plate 2 and the lower die 5, pressing the movable plate 2 on 4 springs 3, and simultaneously placing the lower die side die 4 on the bottom plate 1, wherein 28 ejector rods 6 respectively pass through 28 first through holes between two adjacent blades of the lower die 5 under the action of gravity;

step 3, turning over the fixed upper die 8, the upper die side die 9 and the positioning pins 10, wherein the two positioning pins 10 are matched with two corresponding positioning holes of the lower die 5 respectively, the upper die 8 is contacted with the lower die 5, and the die is assembled at the moment, as shown in the figure 2;

step 4, conveying the die to a workbench of a core shooter, and enabling the bottom plate 1 to be in contact with the workbench and well arranged;

step 5, fixing the upper die side dies 9 on two sides on an upper beam of the core shooter by using a pressing plate and bolts respectively;

step 6, connecting and communicating two sand inlet through holes at the top of the upper die 8 with a sand outlet of a core shooter respectively;

step 7, fixing the side dies 4 of the lower dies on two sides on a lower cross beam of the core shooter by using a pressing plate and bolts respectively;

step 8, respectively penetrating 4 heating pipes 7 with wires from four second through holes on the straight surface of the lower die 5, and respectively connecting two ends of the heating pipes 7 with wires of a core shooter;

step 9, after debugging, the lower die side die 4 is in contact with the bottom plate 1, the lower die 5 is in contact with the upper die 8, at the moment, under the action of gravity of the lower die 5 and the upper die 8, the 4 springs 3 are in a compressed state, the 24 ejector rods 6 return from the 28 first through holes between the adjacent blades of the two die samples of the lower die 5 respectively, equipment is started, coated sand enters into the two die cavities of the upper die 8 and the two die sample cavities of the lower die 5 respectively through two sand outlets of the core shooter and two sand inlet through holes at the top of the upper die 8, and the set time is reached after heating, heat preservation and pressure maintaining;

step 10, an upper beam of a core shooter moves upwards to drive an upper die 8, two upper die side dies 9 and two positioning pins 10 to move upwards, after the two positioning pins 10 are respectively withdrawn from two positioning pin holes of a lower die 5, the upper die 8 is separated from the lower die 5, 28 ejector rods 6 are respectively from bottom to top under the action of 4 springs 3, and the manufactured precoated sand and mud core is ejected from two die cavities of the lower die 5 from 28 first through holes between adjacent blades of two die patterns of the lower die 5, and then the precoated sand and mud core is taken out to finish primary mud core manufacturing, and the attached figure 3 is the manufactured impeller precoated sand and mud core 11;

step 11, resetting the equipment and returning to a working state;

and step 12, repeating the steps 9 to 10, and making the precoated sand core for the next time.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims (8)

1. A water pump impeller core mold, comprising: a bottom plate (1), a movable plate (2), a spring (3), a lower die side die (4), a lower die (5), a push rod (6), a heating pipe (7), an upper die (8), an upper die side die (9) and a positioning mechanism,

the spring (3) sets up at bottom plate (1) top, fly leaf (2) set up spring (3) top, ejector pin (6) set up on fly leaf (2), lower mould (5) set up on fly leaf (2), lower mould sideform (4) symmetry sets up lower mould (5) both sides, be equipped with two pattern die cavities of making the clay core on lower mould (5), pattern die cavity central point puts and all is equipped with the cylinder recess, pattern die cavity is equipped with a plurality of blades around cylinder recess circumference, the interval department of blade all is equipped with a plurality of first through-holes, ejector pin (6) with first through-hole corresponds the cooperation, go up mould (8) with connect through positioning mechanism between lower mould (5), go up mould sideform (9) symmetry setting and be in mould (8) both sides, go up mould (8) top and run through and open two inlet holes.

2. The water pump impeller core mold of claim 1, wherein: the positioning mechanism comprises positioning holes and positioning pins (10), the positioning holes are respectively formed in the diagonal positions of the lower die (5), the positioning pins (10) are arranged at the diagonal positions of the bottom of the upper die (8), and the positioning pins (10) are matched with the positioning holes.

3. The water pump impeller core mold of claim 1, wherein: the lower die (5) is transversely provided with a plurality of second through holes in a penetrating mode, and heating pipes (7) are arranged in the second through holes.

4. The water pump impeller core mold of claim 1, wherein: the number of the blades is 7.

5. The water pump impeller core mold of claim 1, wherein: the number of the ejector rods (6) and the number of the first through holes are 28.

6. The water pump impeller core mold of claim 1, wherein: the upper die (8) is connected with the upper die side die (9) through welding.

7. The water pump impeller core mold of claim 1, wherein: the lower die (5) is connected with the lower die side die (4) through welding.

8. The water pump impeller core mold of claim 1, wherein: the number of the springs (3) is 4.