CN85103480A - The wet clay sand core process of vertical somatotype - Google Patents

Abstract

The wet clay sand core process of vertical somatotype, a kind of vertical somatotype damp clay sand combination type core that is used for the metal casting moulding and in the application of vertical somatotype box-less shoot squeeze automatic moulding production line sand mold.Combination type core is penetrated with vertical parting and is pressed the clay-bonded sand core making machine once to penetrate molded, its hardness reaches 80～90 (A type wet type case hardness meters), core setter tool hand is sent into core in the sand mold die cavity of vertical somatotype box-less shoot squeeze automatic mo(u)lding line, finishes the core automatic moulding and reaches core down.The damp clay sand core maximum volume of this technology can reach 510 * 140 * 280 millimeters, is suitable for generally having the casting mold production of the vertical parting box-less shoot squeeze mo(u)lding line of core foundry goods.

Description

The wet clay sand core process of vertical somatotype

The present invention relates to the formative technology in the metal casting, particularly a kind of in the sand mold die cavity of vertical somatotype box-less shoot squeeze automatic moulding production line, use wet clay sand core process.

As everyone knows, making core with clay sand core is a kind of traditional handicraft, but exists core strength low, and production efficiency is low, shortcomings such as the precision of foundry goods and fineness difference.Though the intensity of clay sand core is improved, has prolonged production process, and brought the problem of collapsibility difference, so fail extensive practicability by roasting procedure.Development along with industrial technology, box-less shoot squeeze automatic moulding production line with the clay-bonded sand moulding has appearred, " development of greensand mo(u)lding technology ", " Brit Foundryman " nineteen eighty-two 75, the NO9 that carry as " Foundry Trade Journal " the 3202nd periodical in 1980 introduce " vertical somatotype do not have the case high-pressure molding line ", all proved the superiority that greensand mo(u)lding had; But the core in the described damp sand sand mold but all is to adopt to contain resin or waterglass etc. and be " the dried core " of binding agent (the pointed core of producing with the supporting core making machine of DISA moulding machine of patent BE84346 is typically arranged).This " dried core " production cost is higher, and often is mixed with poisonous gas in process of production, and is not only harmful, and influences casting quality because of gas infiltrates foundry goods.

In view of clay-bonded sand has aboundresources, cheap characteristics, in recent years, people begin to pay attention to research clay-bonded sand core manufacturing craft again, as DRP DE3341981, French Patent (FRP) FR2537023, BP GB2132527, the green sand core manufacturing process that day disclosure special permission J59104247 and U.S. Pat 3496988 are proposed also all has its practicality.But described core adopts complicated compaction procedure, still needs to spray vaporific scleroma agent and baking after the moulding, could improve the intensity of sand mold.The green sand core that is entitled as the clay-bonded sand manufacturing that " wet type, green sand core are produced the crane foundry goods " literary composition introduces according to another the 43rd page of Japan's " foundry work " first phase in 1981 also only is used for the big foundry goods of horizontal parting sand mold production.

The objective of the invention is to, a kind of formative technology of high strength damp clay core is provided, that is: the hardness made from gas folder fluid pressure type core setter tool handgrip " vertical somatotype is penetrated and pressed core making machine " is 80-90(A type wet type case hardness meter) the damp clay core be placed in the damp sand sand mold die cavity that vertical somatotype high-pressure molding machine makes, per hour to produce the speed of 180 types, finish automatic coremaking and interlock core down.

Clay sand core raw material of the present invention is a clay-bonded sand, and itself and the employed casting mold molding sand material with bentonite adhesive of vertical parting box-less shoot squeeze molding machine of case are identical, and a shared sand preparing system.Fig. 1 has pointed out to make the equipment-vertical somatotype of damp clay core of the present invention and has penetrated pressure clay-bonded sand core making machine structure, it mainly by sand hopper (1), blasting unit (2), gate (3), Sand jet valve (5), go up squeezing cylinder (4), push up real cylinder (6), clamping cylinder (7) down, push away type oil cylinder and core storage platform and form.Sand hopper (1) is controlled into sand amount by the charge level controller in the blasting unit (2) when advancing sand; It is open that gate (3) is closed back Sand jet valve (5), with 3-4kg/Cm ²The compressed air of pressure is injected the core die cavity with the sand material from the dijection mouth, penetrates sand to load quantity, and Sand jet valve is closed, and penetrates and presses workbench (8) displacement, and last squeezing cylinder (4) and the following real cylinder in top (6) carry out two-way extruding; Clamping cylinder (7) action pushes away the type oil cylinder clay sand core is pushed on the platform to abdicate passage then.Above-mentioned each job step as shown in Figure 2.The damp sand that high pressure moulding is used all can be used as coremaking raw sand of the present invention.For example, can be made into the clay sand core of following composition and performance:

Average grit size: 70-140 order screenings.

Specific pressure: 9-11kg/Cm ²

Hygrometric state compressive strength: 2.2kg/Cm ²

Hygrometric state hot strength: 0.2-0.25kg/Cm ²

Coal dust volatile matter: 20-30%

Gas permeability: 110-150

Compression ratio: 25%

Moisture content: 3.4-4.3%

Clay content: 6-8%

The size range of thus obtained damp clay sand core is from 460mm * 100m/m * 200m/m to 510m/m * 140m/m * 280m/m, output is 180 types per hour, its hardness shows by A type wet type case hardness meter and reaches 80-90, do not need to handle (as common hard surface coating and drying) and directly come into operation through other again.Core after the moulding is deposited platform by the core of core making machine and is transported to the sand mold position of moulding line and is placed into the process of going in the die cavity and finished by gas folder hydraulic reciprocating type core setter tool hand.Fig. 3 has pointed out the course of work of this core setter tool hand, and the clamping head inflation picks up the core on the storage platform (Fig. 3-1), send core to sand mold die cavity (Fig. 3-2) by the hydraulic cylinder action thereafter, and the clamping head venting is unclamped core and finished down core (Fig. 3-3).

After following core action was finished, core setter tool hand resetted, and sand mold is mould assembly along with the type that the pushes away action of moulding machine, finished a work step of whole formative technology.Penetrate and press clay-bonded sand core making machine, core setter tool hand, moulding machine three to be designed to the coordinated operation state, that is: after a sand mold is made and released to moulding machine, core setter tool hand is sent the core of core making machine moulding into sand mold die cavity position, then withdraw from, moulding machine was released a sand mold again after following core process was finished, core is placed in the die cavity simultaneously in the process of mould assembly, finishes the making overall process (Fig. 4) of moulding.

Above-mentioned technical process of the present invention has effectively utilized aboundresources, cheap clay-bonded sand, the damp clay core of making has the intensity height, the characteristics that cost is low, core hardness reaches 80-90, and (A type wet type case hardness meter), coremaking is finished by " vertical somatotype is penetrated and pressed the clay-bonded sand core making machine " compacting, need not roasting baking or other processing after the compacting, simplified manufacture process.Raw sand-clay-bonded sand that damp clay core of the present invention uses, with vertical somatotype shoot squeeze molding machine used be that the casting mold molding sand of binding agent is identical with the bentonite; Therefore, a sand preparing system shared with it exempted and set up special-purpose core sand treatment system.Technical process realizes coordinated operation coremaking, transports, plays core, automation.

Description of drawings

Fig. 1-vertical somatotype is penetrated and is pressed clay-bonded sand core making machine overall structure figure, wherein:

1-sand hopper 5-Sand jet valve

2-blasting unit 6-is the real cylinder in top down

3-gate 7-clamping cylinder

The last squeezing cylinder 8-of 4-penetrates the pressure workbench

Fig. 2-vertical somatotype is penetrated and is pressed clay-bonded sand core making machine job step, wherein:

2-1: matched moulds

2-2: penetrate sand

2-3: compacting

2-4: seaming chuck resets

2-5: divide mould

2-6: the handle squeezing cylinder resets

2-7: release core to storage platform

Fig. 3: gas folder fluid pressure type core setter tool 2 step of hand figure

3-1: inflation sandwich

3-2: hydraulic cylinder send core

3-3: original position is also returned in venting core down again

Fig. 4: the clay green core core setter skill figure of vertical somatotype:

4-1: the casting mold that vertical parting flaskless shoot-squeeze moulding machine is made

4-2: the combination green sand core that core making machine is made

4-3: moulding machine sand mold storage platform

4-4: clay-bonded sand system exchange green sand core storage platform

4-5: core setter tool hand-guided bar

4-6: core setter tool hand

The direction of arrow is core action reciprocating direction under the manipulator.

The A direction is the sand mold mould assembly direction of motion

Most preferred embodiment of the present invention:

The sand mold manufacturing of casting malleable cast iron XP-7 type electric power porcelain vase steel cap.By " vertical somatotype is penetrated and pressed the clay-bonded sand core making machine " (Fig. 1), penetrate molded combination type core, its composition and relevant processing performance parameter are as previously mentioned, this combination type core constitutes complete casting mold (Fig. 4) with the sand mold of vertical somatotype box-less shoot squeeze mo(u)lding line, wherein, sand mold (Fig. 4-1) is designed to four steel caps of every type casting, because of the steel cap of casting needs a bigger core and a less core, the clay-bonded sand core designs is for having eight cores corresponding with sand mold die cavity position and linking one with it on a cuboid sand seat; Wherein relatively large core is set directly on the sand seat, and less core is connected by the sand post that is placed on the sand seat, forms a combination type core (Fig. 4-2) thus, and the following core of this combination type core is finished (Fig. 3) by core setter tool hand.Steel cap with such casting mold production meets national standard fully, and fineness reaches 4 precision are compared with " dried core " casting mold in ± 0.1 millimeter scope, and core reduces cost more than 85%.

Claims (4)

1, a kind of formative technology of metal casting, it comprises the use of being penetrated molded core and this core cooperation sand mold by damp clay sand, the invention is characterized in, adopt the identical clay-bonded sand of high-pressure molding once to penetrate molded combination type core by " vertical somatotype is penetrated and pressed the clay-bonded sand core making machine ", be combined on the sand seat and fuse with it by a plurality of cores, its external form full-size is 510 * 140 * 280 millimeters, show that by A type wet type case hardness meter the hardness of this combination type core is 80-90, this combination type core is penetrated and is applied directly in the sand mold die cavity of vertical parting box-less shoot squeeze moulding line after molded.

2, formative technology according to claim 1; Its feature is that also described combination type core can press from both sides hydraulic reciprocating type core setter structure with gas to be sent in the casting mold die cavity of regulation.

3, its feature of formative technology according to claim 1 also is, described core can be hollow.

4, according to claim 1,2,3 described technologies, its feature is that also described core also can be single.

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