CN111168010A - Embedded iron mold device and method for sand lined iron mold casting production - Google Patents

Abstract

The invention relates to an embedded iron mold device and method for sand lined iron mold casting production, and belongs to the field of machinery. The sand-blasting casting mold comprises an iron-type outer frame and an embedded insert, wherein the iron-type outer frame is connected with the embedded insert, and the iron-type outer frame comprises a casting system cavity fixed on an iron mold, a cavity for placing the embedded insert and a cavity sand-blasting hole; the embedded insert comprises a casting cavity and an insert sand shooting hole which can be disassembled and replaced. The invention has reasonable structural design, safety, reliability and convenient operation, can produce different casting products of the same series by replacing different inserts, saves the production input cost and is convenient for popularization and application of sand-lined iron mold casting.

Description

Embedded iron mold device and method for sand lined iron mold casting production

Technical Field

The invention relates to a device and a method, in particular to an embedded iron mold device and a method for sand lined iron mold casting production, and belongs to the field of machinery.

Background

The sand-lined metal mold casting has the advantages of energy conservation, material conservation, high efficiency, high quality, green production and the like, and the application field is wider and wider. The sand-lined casting of iron mould belongs to special casting, and its main technological feature is that a thin layer of precoated sand is coated on the inner cavity of metal mould to form casting mould, as shown in figure 1. Generally, a sand-coating molding machine is adopted to coat a layer of phenolic resin sand on an iron mold inner cavity, and the sand-coating process is realized by a compressed air sand shooting mode; the size of the inner cavity of the iron mold is the size of the casting plus the thickness of the sand-lined layer. Therefore, the inner cavities of the iron molds for sand lined casting production of the iron molds of each casting product are different and unique. In order to meet the production requirements of a production line, certain processing requirements are set on the upper plane, the lower plane, the appearance and the positioning device of the iron mold and an iron mold conveying structure, the processing workload is large, and in order to meet the requirement of rapid solidification and cooling of molten iron in sand-lined casting of the iron mold, the iron mold is heavy and generally more than hundreds of kilograms.

In sand lined metal mold casting production, 10-20 pairs of metal molds or more are needed for producing one variety of castings. Therefore, the investment cost of the iron mold tooling in the iron mold sand-lined casting production is very high compared with the investment cost of the iron mold tooling in the common sand casting, which is also the main reason why the iron mold sand-lined casting production is generally rarely adopted for the production of small-batch castings; how to reduce the cost investment of the iron mold tooling becomes one of the bottlenecks in further popularization and application of the iron mold sand-lined casting technology.

The invention discloses a method for producing an iron mold sand-lined casting truck push rod bracket, which is an invention patent in Chinese patent with publication number 106862497A, wherein publication number is 2017, 06, 20. The inner cavity of the iron mold is manufactured according to the shape of a truck push rod support, an outer sand box adopts the iron mold, and the precoated sand is resin sand; and (5) after the sand core is made, core loading, box closing, pouring and box opening are carried out. By using the method, the yield is improved from 65 percent of the original sand casting to more than 83 percent of the iron mold casting, the defects of subcutaneous air holes, loose tissues and the like are eliminated, the problem of breakage of the truck push rod support during working is solved, the integral mechanical property is improved, and sand treatment equipment, sites and sand consumption are reduced; the harsh environment of casting is improved. Although the process flow is simple and easy to control, the production cost is 30-50% lower than that of sand casting; however, the inner cavities of the iron molds for the sand lined casting production of each casting product are different, so that the uniqueness is realized, the production requirements of a production line are not facilitated, and the sand lined casting technology of the iron molds cannot be well popularized and applied.

Therefore, the iron mold device which has the advantages of reasonable structural design, convenience in operation, reduction in production input cost and convenience in popularization and application of the iron mold sand-lined casting technology is particularly necessary.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the embedded iron mold device and the method for iron mold sand-lined casting production, which have the advantages of reasonable structural design, safety, reliability and convenient operation, can produce different casting products of the same series or similar casting products by replacing different inserts, saves the production input cost, and is convenient for popularization and application of the iron mold sand-lined casting technology.

The technical scheme adopted by the invention for solving the problems is as follows: this an embedded swage device for sand lined metal mold casting production, including swage frame and embedded insert, its characterized in that: the iron-type outer frame is connected with the embedded insert and comprises a casting system cavity, a cavity for placing the embedded insert and a cavity sand shooting hole, wherein the casting system cavity is fixed on an iron type; the embedded insert comprises a casting cavity and an insert sand shooting hole which can be disassembled and replaced.

Preferably, the invention further comprises a bolt, and the iron-type outer frame and the embedded insert are fixed through the bolt.

Preferably, the cavity sand shooting hole and the insert sand shooting hole correspond to each other.

Preferably, the installation size clearance between the embedded insert and the periphery of a cavity for placing the embedded insert is 0.2-0.3 mm; the clearance tolerance enables the embedded insert to be conveniently installed and the insert to expand with heat and contract with cold in the production process.

Preferably, the iron-type outer frame further comprises a fixing hole, the embedded insert further comprises an insert fixing screw hole, the position size of the insert fixing screw hole corresponds to the position size of the fixing holes of the embedded insert and the iron-type outer frame, and all sand shooting holes are avoided.

Preferably, the height of the embedded insert is 0.1-0.2 mm smaller than that of the inner cavity of the iron-type outer frame.

Preferably, the back surface of the cavity of the embedded insert is in plane contact with the iron mold contact surface.

Preferably, the thickness of the iron mold wall of the contact plane of the iron mold outer frame and the back surface of the embedded insert cavity is more than 15 mm.

Preferably, the embedded insert comprises a flywheel casting embedded insert and a base casting embedded insert; and other series of product casting embedded inserts.

The invention also provides a use method of the embedded iron mold device for the sand lined iron mold casting production, which is characterized in that: the method comprises the following steps: firstly, removing an embedded insert which does not produce a casting from an iron-type outer frame, then installing the embedded insert which needs to produce the casting into an embedding space of the iron-type outer frame, wherein the outer plane of a casting cavity of the embedded insert is lower than a parting plane of an iron type during installation, and tightly fixing the embedded insert of the casting product and the iron-type outer frame into a whole through bolts; and then performing sand-lined molding on the iron mold cavity, combining the sand-lined upper and lower iron molds, pouring, solidifying and opening the box to obtain a casting, and finishing the sand-lined iron mold casting of the casting.

Compared with the prior art, the invention has the following advantages and effects: 1. the integral structure is reasonable in design, safe and reliable, and convenient to operate, and one iron mold can be used for producing castings of series or similar products by replacing the cavity insert of the casting to be produced; 2. the capital investment cost of the iron mold tooling of the iron mold sand-lined casting series product castings is greatly saved; 3. the iron mold sand-lined casting production application and popularization of small-batch series product castings are realized.

Drawings

FIG. 1 is a schematic view of a conventional iron mold apparatus for sand-lined iron molds.

Fig. 2 is a first schematic structural diagram of an embedded iron-type device according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an embedded iron-type device according to an embodiment of the present invention.

Fig. 4 is a first schematic structural diagram of an iron-type outer frame of an embedded iron-type device according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an iron-type outer frame of an embedded iron-type device according to an embodiment of the present invention.

Fig. 6 is a first schematic structural diagram of an embedded insert of an embedded iron-type device according to an embodiment of the present invention.

Fig. 7 is a second schematic structural diagram of an embedded insert of an embedded iron-type device according to an embodiment of the present invention.

Fig. 8 is a first schematic structural diagram of an iron-type outer frame shared by two different cast-in inserts according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an iron-type outer frame shared by two different casting embedded inserts according to the embodiment of the present invention.

Fig. 10 is a schematic structural diagram of an embedded iron mold assembling box according to an embodiment of the present invention.

In the figure: the structure comprises an iron-shaped outer frame 1, an embedded insert 2 and a bolt 3; an upper iron mold 4, a lower iron mold 5, a casting mold cavity 6 and a sand-coated layer 7;

iron-type frame 1: a casting system cavity 11, a cavity 12, a cavity sand shooting hole 13, an iron mold positioning mechanism 14, a fixing hole 15, a runner 16 and a locking hanging shaft 17;

the embedded insert 2: a casting cavity 21, an ingate cavity 22, an insert sand shooting hole 23 and an insert fixing screw hole 24;

the flywheel casting embedded insert 2-1, the base casting embedded insert 2-2 and the distance H.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Examples are given.

Referring to fig. 2 to 10, the embedded iron mold device for sand lined iron mold casting production in the present embodiment mainly includes an iron mold outer frame 1 and an embedded insert 2, wherein the iron mold outer frame 1 and the embedded insert 2 are fixed by bolts 3; the iron mold cavity 6 is mainly composed of two parts: the main body of the iron mold is a pouring system cavity 11 in an iron mold outer frame 1, a casting cavity 21 in an embedded insert 2 and a few-part ingate cavity 22.

Referring to fig. 4-5, the iron mold outer frame 1 of the present embodiment is a main body structure of an iron mold, and the iron mold outer frame 1 includes a casting system cavity 11 fixed on the iron mold, a cavity 12 for placing an embedded insert 2, a cavity sand shooting hole 13, a fixing hole 15 for the embedded insert 2 and the iron mold outer frame 1, an iron mold positioning mechanism 14 for sand-coating molding of an upper iron mold 4 and a lower iron mold 5, a mold closing positioning mechanism of the upper iron mold 4 and the lower iron mold 5, an iron mold conveying running edge 16, and a locking hanging shaft 17 for mold closing of the upper iron mold and the lower iron mold.

In the embodiment, the arrangement of the casting system cavity 11 in the iron mold outer frame 1 needs to comprehensively consider and meet all the requirements of the process, the casting and the like of the produced series products or the similar product castings; in order to ensure the heat transfer of the iron mold, the back surface of the cavity of the embedded insert 2 is in complete plane contact with the corresponding part of the iron mold outer frame 1, and the iron mold outer frame is convenient to machine.

The thickness of the iron mold wall of the contact plane of the iron mold outer frame 1 and the back surface of the cavity of the embedded insert 2 is more than 15 mm.

In the embodiment, the height of the embedded insert 2 is 0.1-0.2 mm smaller than that of the inner cavity of the iron mold outer frame 1 to prevent precoated sand from leaking from the parting surface of the iron mold in the sand shooting molding production process.

Referring to fig. 6-7, the insert 2 of the present embodiment comprises a removable and replaceable casting cavity 21, a few-part ingate cavity 22, an insert sand shooting hole 23 and an insert fixing screw hole 24.

The casting cavity 21 in the embedded insert 2 of the embodiment mainly forms various iron-type cavities of series product castings or similar product castings; the peripheral dimension of the embedded insert 2 is consistent with the dimension of a mounting cavity for placing the embedded insert 2 in the iron-type outer frame 1, and a certain clearance tolerance is reserved, and considering the convenient mounting of the embedded insert 2 and the expansion and contraction of the insert in the production process, the peripheral mounting dimension clearance between the embedded insert 2 and the cavity for mounting the embedded insert 2 in the iron-type outer frame 1 is 0.2-0.3 mm.

All the cavity sand ejecting holes 13 of the embodiment correspond to all the insert sand ejecting holes 23 of series products or castings of similar products one by one.

In the embodiment, the position sizes of the insert fixing screw holes 24 in all the embedded inserts 2 should be consistent with the position sizes of the inserts in the iron mold outer frame 1 and the fixing holes 15 in the iron mold outer frame 1 in a one-to-one correspondence manner, and all the positions of the sand shooting holes should be avoided.

Referring to fig. 8-9, there are shown schematic illustrations of the iron shapes of two similar product castings sharing one iron shape outer frame 1, one casting being a flywheel casting, one casting being a base casting, namely, the embedded insert 2 comprises a flywheel casting embedded insert 2-1 and a base casting embedded insert 2-2, the positions of sand shooting holes of the two casting products are completely consistent, the same gating system is arranged in the iron mold outer frame 1, the shapes of ingates in the embedded inserts 2 of the two casting products are different, the base ingate is vertical to the plane of a base casting cavity, the flywheel ingate and the flywheel casting mold cavity are in the tangential direction, however, the gating system in the iron-type outer frame 1 and the ingate in the embedded insert 2 of two casting products can be well connected together, so that the same iron-type outer frame 1 can be adopted, and the investment cost of the iron-type tool can be greatly saved.

Referring to fig. 10, the upper and lower iron molds 4 and 5 are schematically shown in the mold assembly after the iron mold is covered with the sand-coated layer 7, the casting mold of the casting is formed by covering the cavities of the embedded inserts 2 of the upper and lower iron molds 4 and 5 with the coated sand, the runner cavity is formed by covering the inner runner cavity 22 of the upper and lower embedded inserts 2 with the coated sand, and the main casting system is formed by covering the casting system cavity 11 of the upper and lower iron mold outer frames 1 with the coated sand. The iron mold casting mold of the embodiment is basically consistent with a common iron mold sand-lined casting mold, well inherits the conditions of solidification, cooling and heat transfer of the iron mold sand-lined casting, and can fully exert various technological advantages of producing high-quality castings by the iron mold sand-lined casting.

The use method of the embedded iron mold device for sand lined iron mold casting production in the embodiment comprises the following steps: firstly, the embedded insert 2 which does not produce a casting is detached from the iron-type outer frame 1, then the embedded insert 2 which needs to produce the casting is embedded and installed in the embedding space of the iron-type outer frame 1, the outer plane of the insert casting mold cavity is certainly lower than the parting plane of the iron type during installation, the general low distance H is 0.1-0.15 mm, and then the embedded insert 2 of the casting product and the iron-type outer frame 1 are tightly fixed together by using a bolt 3, so that the embedded insert 2 and the iron-type outer frame are integrated. And then, performing sand-lined molding on the iron mold cavity, and performing mould assembling, pouring, solidifying and mould opening on the sand-lined upper iron mold 4 and the sand-lined lower iron mold 5 to obtain a casting, thereby completing the sand-lined casting of the iron mold of the casting.

The working principle of the embodiment is as follows: the casting mold for sand-lined metal mold casting generally adopts a method of sand-shooting and sand-lining molding on a formed metal mold inner cavity to form a thin-layer sand-lined casting mold cavity; when each casting product is produced by sand-lined metal molds, a batch of metal molds with the shape similar to that of the casting need to be matched with the casting, generally, the number of each metal mold is more than 15 pairs, and the investment cost of the metal molds is high. Therefore, the sand lined metal mold casting is generally suitable for the production of castings produced in large scale; the popularization and application of the iron mold sand-lined casting technology are limited due to the input cost of an iron mold tooling mold in the iron mold sand-lined casting production of a plurality of small-batch and multi-variety series castings.

The biggest difference between the embedded iron mold of the embodiment and the iron mold for the common sand-lined iron mold casting production is that the mold cavity 6 of the iron mold consists of two parts: a gating system cavity 11 fixed to the iron mold, a casting cavity 21 removable for replacement, see fig. 2-3. Iron mold cavities of different castings can be formed by replacing different casting cavity inserts which can be disassembled and embedded, and casting mold cavities of different castings can be formed by covering precoated sand, so that the method is used for producing iron mold sand-covered castings of different castings, and is particularly suitable for producing iron mold sand-covered castings of series product castings in small batches.

The embedded iron mold device is used as an iron mold tool for iron mold sand-lined casting and is mainly used for iron mold sand-lined casting production of various small-batch series product castings. For the sand lined metal mold casting production of the product castings, the conventional sand lined metal mold casting technology is bottleneck in popularization and application because the series of varieties are too many, the production batch is small, and the investment of a metal mold tool is too large, so that the sand lined metal mold casting technology is not adopted for production. The embodiment is an iron mold device of a combined type and embedded iron mold cavity, which is developed for solving the problem that the iron mold manufacturing cost of series of multi-variety products or similar product castings is high.

And will be apparent to those skilled in the art from the foregoing description.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (10)

1. The utility model provides an embedded swage device for sand lined metal mold casting production, includes swage frame and embedded insert, its characterized in that: the iron-type outer frame is connected with the embedded insert and comprises a casting system cavity, a cavity for placing the embedded insert and a cavity sand shooting hole, wherein the casting system cavity is fixed on an iron type; the embedded insert comprises a casting cavity and an insert sand shooting hole which can be disassembled and replaced.

2. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the iron-type outer frame and the embedded insert are fixed through bolts.

3. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the cavity sand shooting hole and the insert sand shooting hole correspond to each other.

4. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the installation size clearance between the embedded insert and the periphery of a cavity for placing the embedded insert is 0.2-0.3 mm.

5. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the iron-type outer frame further comprises a fixing hole, the embedded insert further comprises an insert fixing screw hole, the position size of the insert fixing screw hole corresponds to the position size of the fixing hole of the embedded insert and the iron-type outer frame, and all sand shooting holes are avoided.

6. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the height of the embedded insert is 0.1-0.2 mm smaller than that of the inner cavity of the iron-type outer frame.

7. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the back surface of the embedded insert die cavity is in plane contact with the iron-type contact surface.

8. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the thickness of the iron mold wall of the contact plane of the iron mold outer frame and the back of the embedded insert cavity is more than 15 mm.

9. The embedded sand lined metal mold apparatus for sand lined metal mold foundry production of claim 1, wherein: the embedded insert comprises a flywheel casting embedded insert and a base casting embedded insert.

10. A method for using an embedded iron mold device for sand lined metal mold casting production, which is as claimed in any one of claims 1 to 9, and is characterized in that: the method comprises the following steps: firstly, removing an embedded insert which does not produce a casting from an iron-type outer frame, then installing the embedded insert which needs to produce the casting into an embedding space of the iron-type outer frame, wherein the outer plane of a casting cavity of the embedded insert is lower than a parting plane of an iron type during installation, and tightly fixing the embedded insert of the casting product and the iron-type outer frame into a whole through bolts; and then performing sand-lined molding on the iron mold cavity, combining the sand-lined upper iron mold and the sand-lined lower iron mold, pouring, solidifying and opening the box to obtain a casting, and finishing the sand-lined iron mold casting of the casting.

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