CN102896299A

CN102896299A - Production technology for casting thin-wall cookware through using precoated sand hot box method

Info

Publication number: CN102896299A
Application number: CN2012103684032A
Authority: CN
Inventors: 李立新; 刘仁杰; 刘铭雨; 李增民; 谭建波
Original assignee: HEBEI CHUIHUA CASTING CO Ltd; Hebei University of Science and Technology
Current assignee: HEBEI CHUIHUA CASTING CO Ltd; Hebei University of Science and Technology
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2013-01-30
Anticipated expiration: 2032-09-28
Also published as: CN102896299B

Abstract

The invention discloses a production process for casting thin-walled cookware by a sand-coated hot core box method, relates to the technical field of thin-walled cooker casting technology, and comprises the following steps: Step 1, making a hot core box mold according to the shape of the cooker, and the mold has a Pump out the negative pressure structure, and install the hot core box mold on the core shooter; Step 2, inject the coated sand into the hot core box mold, and make the coated sand solidify and form in the hot core box mold through electric heating; Step 3, After the mold is divided, the middle template is removed, and then the mold is closed; step 4, after the mold is closed, the molten iron is poured while drawing negative pressure; step 5, after the casting is cooled, the mold is divided to obtain a formed thin-walled cooker. In the process, the negative pressure operation is carried out on the core shooter and pouring is carried out while the negative pressure is being pumped. It is not necessary to remove the mold before performing the negative pressure operation and pouring operation, which speeds up the cooking utensil molding speed and saves The operation steps are simplified, thereby improving the work efficiency and facilitating the casting of thin-walled cookware.

Description

A kind of production technology of precoated sand hot box process casting thin-walled cooker

Technical field

The present invention relates to casting thin foundry goods technology field, relate in particular to a kind of production technology of precoated sand hot box process casting thin-walled cooker.

Background technology

Cast iron cooker be in the daily life by cook, steam, boil, the means such as stir-fry, in order to food material is processed into the utensil of edible item.Cast iron cooker adopts the casting of conventional cast method mostly, and the process of conventional cast cooker is roughly following a few step: at first, make mould according to the cooker external form; Then, in mould, be cured molding sand; Secondly, the mould with molding sand is poured into a mould; At last, mould is divided the cooker that obtains moulding behind the mould.Have following problem in the above-mentioned technique: (1) uses clay-bonded sand as molding sand generally speaking, and clay-bonded sand intensity is low, and size is unstable, the cast iron cooker shape of producing, size, the difficult assurance of quality.(2) the clay-bonded sand refractoriness is low, causes easily the defectives such as scab, sand hole.(3) manual clay-bonded sand production technology dust is serious, and workman's working condition is relatively poor, and production efficiency is low.(4) cooker of the cooker wall ratio coated sand technology production of clay-bonded sand casting is thicker.(5) under the condition of not taking out negative pressure, pour into a mould the difficult moulding of thin-section casting.

Summary of the invention

Technical problem to be solved by this invention provides a kind of production technology of precoated sand hot box process casting thin-walled cooker, use described explained hereafter cooker to have the characteristics of high efficiency, and the cooker dimensional thickness of producing is thin, any surface finish, refractoriness is high, precision is high.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of production technology of precoated sand hot box process casting thin-walled cooker is characterized in that may further comprise the steps:

Step 1 is made hot core box mould according to the shape of cooker, takes out negative pressure structure on the mould, and hot core box mould is installed on the core shooter;

Step 2 is injected hot core box mould with precoated sand, makes precoated sand curing molding in hot core box mould through electrical heating;

Step 3, core shooter shift out middle template after dividing mould, then matched moulds;

Step 4 starts first vacuum source behind the matched moulds, vacuum source is poured into a mould iron liquid when taking out negative pressure on core shooter, and the gas that produces in the casting process is taken away by vacuum source;

Step 5, after the foundry goods cooling, minute mould obtains the thin-walled cooker of moulding.

The beneficial effect that adopts technique scheme to produce is: in described technique, take out negative-pressure operation and be carry out at core shooter and taking out negative pressure in pour into a mould, take out again negative-pressure operation and pouring operation after need not mould taken off, when taking out negative pressure, pour into a mould, thereby the flowing velocity of having accelerated iron liquid has been accelerated the cooker shaping speed, and take out again negative-pressure operation and pouring operation after need not mould taken off, saved operating procedure, namely accelerate the cooker shaping speed by above-mentioned technique and saved again operating procedure, thereby improved operating efficiency.Be conducive to the casting of thin-walled cooker by aforesaid operations, thin-walled cooker thickness can be less than 3mm, and the cooker of production has dimensional accuracy height, any surface finish, casting deformation is little and yield rate is high characteristics.

In addition, use hot box process to cast in casting process, the consumption of precoated sand is few, and the casting cost is low, energy savings, and protection of the environment, thus reduced production cost.

Description of drawings

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

Fig. 1 is the schematic diagram of step 2 among the present invention;

Fig. 2 is the schematic diagram of step 3 among the present invention;

Fig. 3 is the schematic diagram of step 4 among the present invention;

Fig. 4 is the sectional structure schematic diagram of the mould that uses among the present invention;

Fig. 5 is the structural representation of the core shooter that uses among the present invention;

Wherein: 1, base 2, guide rail 3, supporting plate 4, left half module 5, right half module 6, intermediate die plate 7, cylinder 8, column 9, crossbeam 10, penetrate sand device 11, control cabinet 12, take out negative pressure system.

The specific embodiment

As Figure 1-3, a kind of production technology of precoated sand hot box process casting thin-walled cooker may further comprise the steps:

Step 4 starts first vacuum source behind the matched moulds, vacuum source is poured into a mould iron liquid when taking out negative pressure on core shooter, and the gas that produces in the casting process is taken away by vacuum source, and vacuum source preferably uses vavuum pump;

As shown in Figure 4, above-mentionedly cast the mould that uses in the production technology of cooker with the precoated sand hot box process under condition of negative pressure and be comprised of left and right half module and intermediate die plate, the be heating and curing template of rear centre of precoated sand is taken away.Electric heating tube all is housed, the passage that has the negative pressure of taking out on left and right two half modules on the left and right half module.Matched moulds after precoated sand solidifies is poured into a mould taking out under the condition of negative pressure, and the gas of generation is pumped.

In the process of carrying out above-mentioned technique, can use a kind of hot box shoot core machine of taking out negative pressure system that has, its structure as shown in Figure 5: base 1 is provided with guide rail 2 and supporting plate 3, and hot core box mould is installed on the upper surface of base by supporting plate 3; Hot core box mould comprises left and right half module 4,5 and intermediate die plate 6, and the left and right half module 4,5 of described hot core box mould is provided with electric heating tube and takes out the negative pressure ventilation hole; Along guide rail 2 move left and right, intermediate die plate 6 moves forward and backward at the guide rail below along it under the effect of cylinder 7 left and right half module 4,5 under the effect of cylinder 7; Column 8 is fixed on the centre of base 1, crossbeam 9 is fixed on the upper end of column 8, penetrating sand device 10 is installed on the crossbeam 9, cylinder 7 and penetrate sand device 10 and be controlled by control cabinet 11, the negative pressure ventilation hole of taking out of taking out on the left and right half module 4,5 of negative pressure system 12 and hot core box mould is tightly connected, and takes out negative pressure system and preferably uses vavuum pump.

In described technique, take out negative-pressure operation and be carry out at core shooter and taking out negative pressure in pour into a mould, take out again negative-pressure operation and pouring operation after need not mould taken off, when taking out negative pressure, pour into a mould, thereby the flowing velocity of having accelerated iron liquid has been accelerated the cooker shaping speed, and take out again negative-pressure operation and pouring operation after need not mould taken off, saved operating procedure, namely accelerate the cooker shaping speed by above-mentioned technique and saved again operating procedure, thereby improved operating efficiency.Be conducive to the casting of thin-walled cooker by aforesaid operations, thin-walled cooker thickness can be less than 3mm, and the cooker of production has dimensional accuracy height, any surface finish, casting deformation is little and yield rate is high characteristics.

Claims

1. a production process of coated sand hot core box method casting thin-walled cooker, is characterized in that comprising the following steps:

Step 1. Make a hot core box mold according to the shape of the cooker. There is a negative pressure structure on the mold, and install the hot core box mold on the core shooter;

Step 2: Inject the coated sand into the hot core box mold, and make the coated sand solidify and form in the hot core box mold through electric heating;

Step 3: After the core shooter splits the mold, remove the middle template, and then close the mold;

Step 4: Start the vacuum source first after the mold is closed, pour the molten iron while the vacuum source draws negative pressure on the core shooter, and the gas generated during the pouring process is sucked away by the vacuum source;

In step five, after the casting is cooled, the mold is divided to obtain a formed thin-walled cooker.