CN220049939U

CN220049939U - Multistage parting casting die assembly for simplified pump valve castings

Info

Publication number: CN220049939U
Application number: CN202320303751.5U
Authority: CN
Inventors: 朱爱军; 黄镱清
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-11-21
Anticipated expiration: 2033-02-24

Abstract

The utility model discloses a simplified pump valve casting multistage parting casting die assembly, which comprises: the lower molding box comprises a lower plate mold and a sand box matched with the lower plate mold; the upper molding box comprises an upper plate mold and a sand box matched with the upper plate mold, and can be in butt joint with the lower molding box, and a cavity is formed between the upper molding box and the lower molding box; the lower shape of the intermediate shell core is matched with the upper shape of the casting at the corresponding multi-stage parting surface, the upper shape of the intermediate shell core is matched with the shape of the casting which cannot be molded at the upper-stage multi-stage parting surface, and the intermediate shell core is positioned in the cavity; the runner core is matched with the runner shape in the casting, and the runner core is positioned in the cavity.

Description

Multistage parting casting die assembly for simplified pump valve castings

Technical Field

The utility model relates to the technical field of casting processes, in particular to a multistage parting casting die assembly for a simplified pump valve casting.

Background

The pump valve products are widely applied to industries such as petroleum, sewage treatment, automobiles, ships, fuel gas and the like, so the purchasing quantity of castings at home and abroad is very large.

Many pump valve products have relatively complex structures, and the casting purpose cannot be realized by dividing the pump valve products into a bottom box and a cover box by using a common process means, namely primary parting. The approach commonly used today is two-stage parting, a process known as three-stage box molding on casting. The molding process is completed by stacking three molding boxes, which is called as two-stage parting on casting, and more complex four-stage and more stacking boxes are completed, which is called as a multi-stage parting process.

The secondary or multi-stage parting original casting process cannot be suitable for casting mechanized flow line production, most of the casting processes adopt manual operation, so that the capacity of casting companies cannot meet the requirement of large-batch purchasing of clients, and more importantly, the precision and the product appearance index of the castings are greatly reduced due to the fact that the multi-stage parting of the original casting process adopts multi-stage sand box superposition. Meanwhile, the casting process is complicated, the labor productivity is low, the production cost is high, the comprehensive yield of the manual operation products is unstable, and the problems of batch processing and waste removal and the like are easy to occur due to the fluctuation of the dimensional accuracy of the products.

Disclosure of Invention

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a multi-stage parting casting die assembly for a simplified pump valve casting.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a simplified pump valve type casting multi-stage parting casting mold assembly comprising:

the lower molding box comprises a lower plate mold and a sand box matched with the lower plate mold;

the upper molding box comprises an upper plate mold and a sand box matched with the upper plate mold, and can be in butt joint with the lower molding box, and a cavity is formed between the upper molding box and the lower molding box;

the lower shape of the intermediate shell core is matched with the upper shape of the casting at the corresponding multi-stage parting surface, the upper shape of the intermediate shell core is matched with the shape of the casting which cannot be molded at the upper-stage multi-stage parting surface, and the intermediate shell core is positioned in the cavity;

the runner core is matched with the runner shape in the casting, and is positioned in the cavity.

As a preferred embodiment of the present utility model for simplifying a multistage split casting mold assembly for pump valve type castings, wherein: and a feeding riser is arranged on the upper plate die, and a feeding process platform matched with the feeding riser is arranged on the intermediate shell core.

As a preferred embodiment of the present utility model for simplifying a multistage split casting mold assembly for pump valve type castings, wherein: the lower plate die is provided with a positioning block, and a positioning groove into which the positioning block extends is correspondingly formed in the middle body shell core.

The beneficial effects of the utility model are as follows:

(1) The positioning blocks are arranged on the upper plate die and/or the lower plate die, positioning grooves for the positioning blocks to extend into are correspondingly formed in the middle body shell core, and the position stability of the middle body shell core is ensured through the matching of the positioning blocks and the positioning grooves, so that the accuracy of the shape of a casting is ensured;

(2) The feeding riser is arranged on the upper plate die and/or the lower plate die, and the feeding process platform is correspondingly arranged on the intermediate shell core, so that the feeding performance of the casting die is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a process flow for multi-stage parting casting of a simplified pump valve type casting utilizing the present utility model;

FIG. 2 is a schematic view of the structure of the pump casting provided in the present embodiment;

FIG. 3 is a two-stage parting schematic of the pump casting provided in this example;

fig. 4 is a schematic structural view of a lower plate mold in a casting mold for simplifying multistage parting of pump valve castings provided in this embodiment;

fig. 5 is a schematic structural diagram of a first movable mold in a casting mold for simplifying multistage parting of pump valve castings according to the embodiment;

fig. 6 is a schematic structural diagram of a first stationary mold in a casting mold for simplifying multistage parting of pump valve castings according to the embodiment;

FIG. 7 is a schematic view of the structure of an intermediate core in a casting mold for simplifying multistage parting of pump valve castings according to the embodiment;

FIG. 8 is a schematic view of the structure of an upper plate mold in a casting mold for simplifying multistage parting of pump valve castings provided in this embodiment;

FIG. 9 is a side view of an upper plate die in a casting mold for simplifying multistage parting of pump valve castings provided by the present embodiment;

fig. 10 is a schematic structural diagram of a second movable mold in a casting mold for simplifying multistage parting of pump valve castings according to the embodiment;

fig. 11 is a schematic structural view of a second stationary mold in a casting mold for simplifying multistage parting of pump valve castings provided in this embodiment;

FIG. 12 is a schematic view of the structure of a runner core in a casting mold for simplifying multistage parting of pump valve castings provided in this embodiment;

FIG. 13 is a side view of a runner core in a casting mold for simplified multi-stage parting of pump valve castings provided by the present embodiment;

wherein: 1. an upper plate mold; 2. a lower plate mold; 3. feeding riser; 4. a positioning block; 5. an intermediate shell core; 6. a positioning groove; 7. feeding a process platform; 8. a first movable mold; 9. a first stationary mold; 10. a second movable mold; 11. a second stationary mold; 12. a runner core.

Detailed Description

In order that the utility model may be more readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic flow diagram of a casting process for simplifying multistage parting of pump valve castings, which is provided by an embodiment of the utility model; the casting process comprises the steps S101-S107, and the specific steps are as follows:

step S101: determining a parting process of the casting, and manufacturing a lower mold box of the casting, wherein the parting process comprises one-stage parting and multi-stage parting.

Specifically, for the casting, the parting is designed as a one-stage parting from the center of the flow passage of the pump body according to the general process, thereby forming a lower part of the flow passage of the pump body and an upper part of the flow passage of the pump body. For both parts, if the outer shape can be formed entirely from sheet mould, only one-stage parting is required for the casting; if any part has a part structure which can not be directly drawn and molded by the plate mold, the part also needs to be designed with two-stage parting to cast the casting structure completely. If there is still an unmachined structure for the second fraction, then the design of the third fraction is continued for that part of the structure, and so on.

It will be appreciated that the two-stage typing, the three-stage typing and the above all belong to a multistage typing process.

Referring to fig. 2, in this embodiment, taking foreign pump castings as an example, a horizontal plane of the maximum outer diameter of the pump body runner is determined as a first-order parting plane, so as to form a part below the pump body runner and a part above the pump body runner; and analyzing the two parts, wherein the external shape of the part below the first parting surface of the casting can be completely manufactured into the lower plate mold 2, and the part above the first parting surface has the integral part of the casting which cannot be directly carried out by the upper flange part at the reinforcing rib of the lower port of the upper flange. FIG. 3 is a two-stage parting schematic of the casting.

And after the parting surface of the casting is determined, designing and manufacturing a lower mold box of the casting. The lower molding box of the casting comprises a lower plate mold 2 and a sand box matched with the lower plate mold 2. The specific manufacturing process comprises the following steps: the green sand is used as a medium filling shock to be pressed in the opened lower plate mould 2 and the matched sand box, and then the plate mould is released to form the lower mould box taking the matched sand box and the green sand as carriers. The lower plate mold 2 is manufactured as shown in fig. 4.

Step S102: and designing and manufacturing an intermediate shell core 5 mould for each multi-stage parting, manufacturing an intermediate shell core 5 through the intermediate shell core 5 mould, wherein the lower shape of the intermediate shell core 5 is matched with the upper shape of a casting at the corresponding multi-stage parting surface, and the upper shape of the intermediate shell core 5 is matched with the shape of a casting which cannot be molded at the upper-stage multi-stage parting surface.

Specifically, for the multistage parting of the casting, a mold for manufacturing the intermediate shell core 5 is designed and manufactured, and then the intermediate shell core 5 is manufactured.

For castings that would otherwise require two-stage parting, the lower shape of the intermediate shell core 5 perfectly matches the shape of the upper portion of the casting, and the upper shape of the intermediate shell core 5 perfectly matches the shape of the portion of the upper portion of the casting that cannot be made with one-stage parting. The intermediate shell core 5 can achieve the design purpose of simplifying the secondary parting into the primary parting. For the castings which originally need three-stage parting and above, a corresponding intermediate shell core 5 mould is designed and manufactured for each multi-stage parting surface, and then a corresponding intermediate shell core 5 is manufactured. The intermediate shell cores 5 are then assembled in combination for the purpose of simplifying the multi-stage parting into one-stage parting.

The specific steps of the step are described as follows:

a. for each multi-stage parting plane a corresponding intermediate shell core 5 is designed.

b. And designing and manufacturing a corresponding intermediate shell core 5 core box according to the intermediate shell core 5.

c. The intermediate case core 5 is manufactured by an intermediate case core 5 core box.

Taking the foreign pump casting as an example, the intermediate shell core 5 core box matched with the designed intermediate shell core 5 is divided into a first movable die 8 and a first fixed die 9. Wherein, the first movable mold 8 is shown in fig. 5, the first fixed mold 9 is shown in fig. 6, and the manufactured intermediate shell core 5 is shown in fig. 7.

It should be noted that, the external shape and the internal cavity shape of the intermediate shell core 5 generally adopt a conformal design mode, so that the casting cost can be reduced. In order to facilitate the drawing of the casting molding process, the external shape of the intermediate shell core 5 can be locally adjusted, and the thickness of the intermediate shell core 5 is generally designed to be 12-15mm. The design principle here is to guarantee that the intensity of the intermediate shell core 5 meets the requirement of filling when the molten metal is filled, and prevent the thermal deformation of filling.

Preferably, the upper plate die 1 and/or the lower plate die 2 are provided with positioning blocks 4, and the middle body shell core 5 is correspondingly provided with positioning grooves 6 for the positioning blocks 4 to extend into.

Taking the foreign pump casting as an example, three positioning blocks 4 are arranged on the lower plate die 2, and the three positioning blocks 4 enclose a triangle on the end face of the lower plate die 2. Correspondingly, three positioning grooves 6 are formed in corresponding positions on the middle body shell core 5, and when the middle body shell core 5 is installed, the positioning blocks 4 on the lower plate die 2 can extend into the corresponding positioning grooves 6, so that the position stability of the middle body shell core 5 is ensured, and the precision of the casting shape is ensured.

In addition, in the case of gray cast iron or ductile cast iron castings, the shrinkage tendency of the castings is large, and therefore, process feed needs to be considered in the design of the mold process. For such castings, feeding heads 3 are provided on the upper and/or lower plate moulds 1, 2, and correspondingly feeding process platforms 7 cooperating with the feeding heads are provided on the intermediate shell cores 5.

Taking the foreign pump casting as an example, referring to fig. 8 and 9, a feeding head 3 is provided on the upper plate mold 1. Correspondingly, a feeding process platform 7 is provided on the intermediate shell core 5, see fig. 7. After assembly, the feeding heads 3 on the upper plate die 1 can be mated with corresponding feeding process platforms 7 on the intermediate shell core 5.

Step S103: the runner core 12 is designed and fabricated according to the runner of the casting.

Specifically, a matched runner core 12 core box is designed according to the inner cavity or runner of the casting, and the runner core 12 is prefabricated before production, so that the runner core is convenient to use in molding.

Taking the foreign pump casting as an example, the runner core 12 core box matched with the designed runner core 12 is divided into a second movable die 10 and a second fixed die. Wherein, the second movable mold 10 is shown in fig. 10, the second fixed mold is shown in fig. 11, and the prepared runner core 12 is shown in fig. 12.

Step S104: and manufacturing an upper mold box corresponding to the lower mold box according to the intermediate shell core 5.

Specifically, the corresponding upper pattern plate 1 and the matched sand box are designed according to the shape and size parameters of the intermediate shell core 5 and the lower pattern plate 2.

The design of the upper plate mould 1 and the lower plate mould 2 is considered to be matched with the internal cavity and the intermediate shell core 5, meanwhile, the convenience of molding and demoulding is considered, and the rationality of the casting riser technological system is considered, so that the defect that the casting is shrinkage cavity and shrinkage porosity are not caused by insufficient feeding is avoided.

Step S105: the runner core 12 is placed at a predetermined position in the lower molding box, and then the intermediate shell cores 5 are sequentially assembled and placed at a predetermined position in the lower cavity.

Specifically, the lower plate die 2 is firstly installed on a corresponding station of a production line molding machine, then a sand box matched with the lower plate die 2 is closed, the surface of the die is cleaned, the mixed molding material is placed, and compaction is performed in a jolt ramming manner. The lift forming forms the drag mold with the mating flask and molding material. After the lower mold box is cleaned, the runner core 12 is placed at a predetermined position in the lower cavity, and the prefabricated intermediate shell core 5 is placed at a predetermined position in the lower cavity.

Step S106: and (3) butting and fixing the upper molding box and the lower molding box, pouring molten metal into the cavity, cooling for 60-90min, and taking out the formed casting.

Specifically, the upper plate mould 1 is installed on a corresponding station of a production line moulding machine, a sand box matched with the upper plate mould 1 is closed, the surface of the mould is cleaned, the mixed moulding material is put into the mould, jolt compaction is carried out, and an upper mould box formed by the sand box and the moulding material is formed after mould stripping. And then, an exhaust channel is formed in a preset position on the upper cavity, and a casting head and floating sand in the upper cavity are cleaned. And then, aligning the cleaned upper mold box with the lower mold box by using a locating pin rod, fixing the upper mold box with the lower mold box by using a box clamp or a fixing screw after closing, injecting molten metal from a reserved pouring system, cooling for 60-90min along with the mold box after filling, and discharging the mold box.

Step S107: and cooling the casting to normal temperature, and then performing sand removal and shot blasting, and removing the shawl, polishing and fine polishing.

Through the process steps, the multi-stage parting of the casting is simplified into one-stage parting, the casting of the complex casting is simplified, and the production task can be conveniently and efficiently completed on an automatic production line.

The embodiment also provides a casting mold for simplifying multistage parting of pump valve castings, which comprises a lower molding box, an upper molding box, an intermediate shell core 5 and a runner core 12.

Specifically, the lower plate mould 2 and the matched sand box are designed according to the shape and material requirements of the casting, and then the lower plate mould 2 and the matched sand box are made into the lower mould by jolt compaction by adding modeling materials. The upper mold design is that the upper mold 1 and the matched sand box are manufactured according to the shape and the size of the lower plate mold 2 and the middle body shell core 5, and then the upper mold 1 and the matched sand box are added with molding materials to be jolt and pressed to manufacture the upper mold. The upper molding box and the lower molding box can form a cavity after being butted.

One intermediate shell core 5 is designed and fabricated at each multi-stage parting of the casting. Referring to fig. 7, the lower shape of each intermediate shell core 5 matches the upper shape of the casting at the corresponding multi-stage parting surface, and the upper shape matches the shape of the casting that cannot be formed at the upper-stage multi-stage parting surface. The intermediate housing core 5 is located in the mould cavity.

For castings that would otherwise require two-stage parting, the lower shape of the intermediate shell core 5 perfectly matches the shape of the upper portion of the casting, and the upper shape of the intermediate shell core 5 perfectly matches the shape of the portion of the upper portion of the casting that cannot be made with one-stage parting. The intermediate shell core 5 can achieve the design purpose of simplifying the secondary parting into the primary parting. For the castings which originally need three-stage parting and above, designing and manufacturing corresponding intermediate shell core 5 molds for each parting surface, and further manufacturing corresponding intermediate shell cores 5; the intermediate shell cores 5 are then assembled in combination for the purpose of simplifying the multi-stage parting into one-stage parting.

The shape and the inner cavity of the middle shell core are designed in a follow-up mode as much as possible, so that the cost of the sand core can be saved, and the shape of the middle shell core is designed by considering the convenience of casting and drawing of the upper plate mould 1; the design wall thickness of the middle shell core is generally 12-15mm; except for the partial shape that needs to be deliberately filled due to the draft.

The runner core 12 matches the shape of the runner in the casting. Runner core 12 is located within the cavity.

The casting mold can simplify the multi-stage parting of the casting into one-stage parting, realizes the simplification of the casting process of the complex casting, and is convenient for high-efficiency completion of production tasks on an automatic production line.

In addition to the above embodiments, the present utility model may have other embodiments; all technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the utility model.

Claims

1. A simplified pump valve class foundry goods multistage split casting mold assembly, characterized in that: comprising the following steps:

the runner core is matched with the runner shape in the casting, and the runner core is positioned in the cavity.

2. The simplified pump valve type casting multi-stage parting casting mold assembly as claimed in claim 1, wherein: and a feeding head is arranged on the upper plate die, and a feeding process platform matched with the feeding head is arranged on the intermediate shell core.

3. The simplified pump valve type casting multi-stage parting casting mold assembly as claimed in claim 1, wherein: the lower plate die is provided with a positioning block, and the middle body shell core is correspondingly provided with a positioning groove for the positioning block to extend into.