CN106424563A

CN106424563A - Lost-form casting method

Info

Publication number: CN106424563A
Application number: CN201611016893.4A
Authority: CN
Inventors: 张海学
Original assignee: SUIYANG HAIHONG FOUNDRY CO Ltd
Current assignee: Peixian Changyun Machinery Manufacturing Co., Ltd
Priority date: 2016-11-18
Filing date: 2016-11-18
Publication date: 2017-02-22
Anticipated expiration: 2036-11-18
Also published as: CN106424563B

Abstract

The invention discloses a lost-form casting method, which comprises the following steps: (1) putting the lost-form mold of the elevator rope sheave after the coating and drying into a moulding flask; step (2) filling sand into the moulding flask to complete molding; (3) vacuuming the moulding flask and pouring liquid metal. Between the step (1) and the step (2), a rope groove of the lost-form mold is embedded with a sand layer, a sand bag is placed in the moulding flask; the lost-form mold embedded in the sand layer is placed into the moulding flask, so that the sand bag is abutted against the sand layer; moulding sand is filled into the moulding flask, a plurality of expansion blocks are arranged in the moulding flask and correspond to the sand bag; the expansion blocks and the moulding flask are supported by the support rods. The lost-form casting method mainly solves the problem of low standard rate of castings due to low fitting degree of the moulding sand and the lost-form mold.

Description

A kind of casting method of evaporative pattern

Technical field

The invention belongs to casting and molding field is and in particular to a kind of sand mold for mould casting or similar casting mold.

Background technology

Lost foam casting be foam mould adopt bindless dry sand combine vacuum pumping technology cavityless casting, be by with The similar bubbles model bonding of casting dimension shape is combined into model cluster, after brushing fireproof coating and drying, is embedded in molding sand and shakes Dynamic moulding, pours into a mould under negative pressure, so that model is gasified, and liquid metals occupies modal position, forms the new of foundry goods after solidification cooling Casting method.

At present, the foundry goods compliance rate produced is relatively low, and it main reason is that in foundry goods manufacture process, molding sand and foam mold The laminating degree of type is not high, particularly to the bend of foundry goods, groove portion and hole portion.In the production process to elevator rope pulley, elevator The bubbles model of rope sheave（Including body and grooving）Vibration molding in molding sand, the neighbouring sand compaction of grooving of bubbles model is not Enough, lead to moulding in molding sand for the bubbles model imperfect, therefore reduce reaching of the elevator rope pulley that liquid metals cast is obtained Mark rate.

Content of the invention

The invention is intended to providing a kind of casting method of evaporative pattern, not to lead because of the degree of packing between molding sand and evaporative pattern Cause the low problem of foundry goods compliance rate.

In order to achieve the above object, the base case of the present invention is as follows：A kind of casting method of evaporative pattern, the method bag Include：Step（1）The evaporative pattern of the elevator rope pulley by coating and after drying puts into sandbox；Step（2）Insert type in described sandbox Sand completes moulding；Step（3）Described sandbox is vacuumized and carries out with potting syrup body metal；In step（1）With step（2）Between also Including：It is packed with layer of sand in the grooving of evaporative pattern；It is placed with sand pocket in sandbox；The evaporative pattern of embedded layer of sand is put in sandbox, Sandbag is offseted with layer of sand；Fill molding sand into sandbox, place some groups of expanding blocks in sandbox, and ensure every group of expanding block Positioned opposite with sand pocket, and every group adopt they sup-port between expanding block and sandbox.

The principle of base case：During operation, layer of sand is embedded in the grooving of evaporative pattern；Again evaporative pattern is put together with layer of sand Enter sandbox, and the sand pocket in sandbox is offseted with layer of sand；Insert molding sand and complete moulding in sandbox；Grooving periphery in sandbox To some groups of expanding blocks of placement, and every group of expanding block is all oppositely arranged with sand pocket；Sandbox is vacuumized and carries out with potting syrup body gold Belong to；Liquid metals makes evaporative pattern gasify, and the heat of liquid metals makes expanding block heat expand, the expansion under this state Block extrudes to sand pocket, and sand pocket extruding layer of sand makes the degree of packing between layer of sand and evaporative pattern higher；Final liquid metal accounts for According to modal position, after solidification cooling, form foundry goods.

The advantage of base case：This programme utilizes layer of sand to embed grooving, and the sand pocket in cooperation sandbox can avoid the molding sand can not The full grooving of filling causes the not up to standard of foundry goods；Expanding block extruding sand pocket after being expanded using heat, sand pocket extruding layer of sand makes sand The degree of packing between layer and the grooving of evaporative pattern is higher, and then ensure that the integrality of evaporative pattern moulding in molding sand, improves The compliance rate of elevator rope pulley.

Preferred version one：Based on scheme preferred version, expanding block described in every group is triangular in shape, is set by above-mentioned Put, according to the stability of triangle, every group of expanding block is more stable to the extruding of sand pocket, improves the compliance rate of mould casting.

Preferred version two：Preferably one preferred version, each described expanding block is rectangle, and expanding block is met Contact for face with the contact surface of sand pocket after thermal expansion, by above-mentioned setting, compared to a contact, the expansion after being expanded using heat Block is contacted with the face of sand pocket, increases the stress surface of sand pocket, strengthens the squeezing effect to sand pocket, improves reaching of mould casting Mark rate.

Preferred version three：Preferably one another preferred version, described sandbox is provided with draw ring, using loop wheel machine It is connected with draw ring and realizes the movement of sandbox, by above-mentioned setting, the hook using loop wheel machine is connected with link, realize mechanization fortune Defeated, reduce manual labor.

Brief description

Fig. 1 is a kind of structural representation of the lost foam casting device embodiment of casting method use of evaporative pattern of the present invention Figure；

Fig. 2 is the structural representation of grooving.

Specific embodiment

Below by specific embodiment, the present invention is further detailed explanation：

Reference in Figure of description includes：Sandbox 1, molding sand 2, body 3, grooving 4, sand pocket 5, expanding block 6, link 7.

Embodiment is substantially as shown in accompanying drawing 1, Fig. 2：The lost foam casting device that a kind of casting method of evaporative pattern uses, bag Include the evaporative pattern of sandbox 1, molding sand 2 and elevator ropes colyliform, the full sandbox 1 of molding sand 2 filling, evaporative pattern is positioned over inside molding sand 2, sandbox On 1, the packed layer matching with grooving 4 is connected with by iron chains, packed layer includes layer of sand and sand pocket 5, molding sand from the inside to the outside successively It is provided with the expanding block 6 of some groups of pre- thermal expansions, every group of expanding block 6 is all oppositely arranged with sand pocket 5, and every group of expanding block 6 and case in 2 It is connected with support bar between body 1, every group of expanding block 6 is triangular in shape, the side wall of sandbox 1 is connected with link 7.

In the present embodiment, during operation, layer of sand is embedded in the grooving 4 of evaporative pattern；Again evaporative pattern is put into together with layer of sand Sandbox 1, and the sand pocket 5 in sandbox 1 is offseted with layer of sand；Insert molding sand in sandbox 1 and complete moulding；Grooving 4 in sandbox 1 Outer circumference places some groups of expanding blocks 6, and every group of expanding block 6 is all oppositely arranged with sand pocket 5；Sandbox 1 is vacuumized and pours Note liquid metals；Liquid metals makes evaporative pattern gasify, and the heat of liquid metals makes expanding block 6 heat expand, this shape Expanding block 6 under state extrudes to sand pocket 5, and sand pocket 5 extruding layer of sand makes the degree of packing between layer of sand and the grooving of evaporative pattern Higher；Final liquid metal occupies modal position, forms foundry goods after solidification cooling.

Above-described is only embodiments of the invention, the general knowledge here such as known concrete structure and/or characteristic in scheme Excessively describe.It should be pointed out that for a person skilled in the art, on the premise of without departing from present configuration, also Some deformation can be made and improve, these also should be considered as protection scope of the present invention, these are real all without the impact present invention The effect applied and practical applicability.This application claims protection domain should be defined by the content of its claim, specification In specific embodiment etc. record the content that can be used for explaining claim.

Claims

1. a kind of casting method of evaporative pattern, the method includes：Step（1）The evaporative pattern of the elevator rope pulley by coating and after drying Put into sandbox；Step（2）Insert molding sand in described sandbox and complete moulding；Step（3）Described sandbox is vacuumized and pours Note liquid metals；It is characterized in that：In step（1）With step（2）Between also include：It is packed with layer of sand in the grooving of evaporative pattern；? It is placed with sand pocket in sandbox；The evaporative pattern of embedded layer of sand is put in sandbox so that sandbag is offseted with layer of sand；Fill into sandbox Molding sand, places some groups of expanding blocks in sandbox, and ensures that every group of expanding block is positioned opposite with sand pocket, and every group of expanding block and sand They sup-port is adopted between case.

2. evaporative pattern according to claim 1 casting method it is characterised in that：Expanding block described in every group is triangular in shape.

3. evaporative pattern according to claim 2 casting method it is characterised in that：Each described expanding block is rectangle, And contact for face with the contact surface of sand pocket after the expansion of expanding block heat.

4. evaporative pattern according to claim 3 casting method it is characterised in that：Draw ring is provided with described sandbox, profit It is connected with draw ring with loop wheel machine and realize the movement of sandbox.