A kind of upper mold of bucket tooth precoated sand mould

A kind of upper mold of bucket tooth precoated sand mould

A kind of upper mold of bucket tooth precoated sand mould

Technical field
The invention belongs to engineering machinery production field, more particularly to a kind of excavator or loading machine bucket tooth precoated sand mould Upper mold.

Background technology

Bucket tooth is the important easily consumption component on excavator or loading machine, is by crown and toothholder group similar to the tooth of people Into Dipper Teeth, the two by axis pin connect;Such as Fig. 1, the crown root of bucket tooth is usually provided with pin shaft hole, passes through axis pin and position In the toothholder connection on scraper bowl;In irregular shape due to bucket tooth, its producer is mostly using the method production hair of metal casting Base, is then being machined, to obtain more preferable stability and machining accuracy;Existing bucket tooth blank is mostly using casting Iron is cast, its casting method is first according to bucket tooth design drawing, selects suitable die joint, makes shape and bucket tooth shape The identical built-up pattern of shape, this built-up pattern faying face using die joint as boundary as built-up pattern mostly, this model It is mostly wooden or aluminum is to carry and to process;Second, model is put into sandbox, foundry sand is inserted and tamps, by sand Case separately takes out model, and the shape cavity identical with model is formed among the sand in sandbox, then produces casting and lead to Road and riser just complete the sand mold before casting and make;3rd, after sand mold to be carried out to appropriate drying, sandbox is closed up, will be cast Molten metal is made to pour into from pouring channel;4th, sandbox is removed after cooling, sand mold is crushed, takes out casting, cast gate is taken out and emits Mouthful, just complete the making of bucket tooth blank;When being poured into due to molten iron in sand mold, molten iron is to sand mold there are expansive force, and sand mold is opposite It is soft, the shape of sand mold inner cavity will be caused to produce change, and this change is uncertain, the blank for resulting in casting out Appearance and size is not known;The characteristics of due to process above, its casting method is there are the operation amount of labour is big, to the skilled of worker Operative skill requires high, it is desirable to which working area is big, and operating environment is poor, and dust is big, and cast(ing) surface material roughness value is high, reserves processing Amount is big, waste of raw materials, flexible type, the defects such as qualified yield rate is low.

The content of the invention
A kind of blank manufacture method of bucket tooth is proposed for the above problem, the present invention existing for the production of existing bucket tooth blank, It is characterized in that:Comprise the following steps:First, according to the design drawing of bucket tooth, bucket tooth precoated sand mould is manufactured and designed;2nd, will bucket The precoated sand mould of tooth, which is put on automatic moulding machine, produces precoated sand cast arenaceous shell model and sand core model;3rd, pour into a mould;4th, Take out casting and clear up.

Bucket tooth precoated sand mould described in the step one refers to be used to make arenaceous shell using steel material is manufactured With the mould of the model of sand core;It is characterized in that:Including upper mold, lower die, attribute block, half pours into a mould core, inner core, cylinder;Described The faying face of upper mold and the lower die is the cast die joint of bucket tooth;The upper mold is fixed with the lower die by positioning pin Relative position;The upper mold forms a set of including the bucket tooth first half and bucket tooth lower half after being involutory with the lower mold cavity The bucket tooth arenaceous shell shape in portion, and a set of complete bucket tooth sand core shape including the sand core first half and sand core lower half.

The upper mold, it is characterised in that:Including cope plate, upper levorotation chamber, left sand inlet, mounting hole, upper middle cavity, in Sand inlet, upper right cavity, right sand inlet, location hole, venthole;The cope plate is located at the periphery of upper impression, by steel material Material is made;The upper levorotation chamber is located at the inside left of cope plate;The shape of upper levorotation chamber and the die joint of sand core Upper partial shape is identical;The appearance and size that the size of the upper levorotation chamber is equal to the part on the die joint top of sand core adds sand The design thickness of core;The left sand inlet is arranged on the cope plate on levorotation chamber top, is connected with upper levorotation intracavitary portion;Institute The mounting hole stated is arranged on cope plate, is matched with the installing plate of automatic arenaceous shell forming machine;The upper middle cavity is located at upper mold In the middle part of the inside of plate;The shape of the upper middle cavity is identical with the shaped upper part of arenaceous shell left-half;The upper middle cavity Size be equal to arenaceous shell left-half top appearance and size add arenaceous shell design thickness;The middle sand inlet is arranged on In upper on the cope plate on cavity top, connected with upper medium-sized intracavitary portion;The upper right cavity is located at the inner right side of cope plate; The shape of the upper right cavity is identical with the shaped upper part of arenaceous shell right half part;The size of the upper right cavity is equal to arenaceous shell The appearance and size on the top of right half part adds the design thickness of arenaceous shell;The right sand inlet is arranged on upper right cavity top On cope plate, with being connected inside upper right cavity;The location hole is located on cope plate, is aligned with the location hole in lower template Afterwards, its interior chamber size forms arenaceous shell and sand core size adds arenaceous shell and sand core thickness;The venthole is arranged on upper mold On plate, the overflow ducts between upper middle cavity and upper right cavity connect.

The lower die, it is characterised in that:Including lower template, bottom left cavity, left sand inlet, mounting hole, lower middle cavity, in Sand inlet, bottom right cavity, right sand inlet, location hole, venthole;The lower template is made of steel material, positioned at cavity Periphery;The bottom left cavity is located at the inside left of lower template;Under the shape of bottom left cavity and the die joint of sand core Partial shape is identical;The appearance and size that the size of the bottom left cavity is equal to the part of the die joint lower part of sand core adds sand core Design thickness;The left sand inlet is arranged in the lower template of bottom left cavity lower part, with being connected inside bottom left cavity;It is described Mounting hole be arranged on cope plate, matched with the model sheetinstallat plate of automatic arenaceous shell forming machine;Under the lower middle cavity is located at In the middle part of the inside of template;The shape of the lower middle cavity is identical with the lower shape of arenaceous shell left-half;It is medium-sized under described The size of chamber is equal to design thickness of the appearance and size plus arenaceous shell of the lower part of arenaceous shell left-half;The middle sand inlet is set In the lower template of lower middle cavity lower part, medium-sized intracavitary portion connects with;The inside that the bottom right cavity is located at lower template is right Side;The shape of the bottom right cavity is identical with the lower shape of arenaceous shell right half part;The size of the bottom right cavity is equal to The appearance and size of the lower part of arenaceous shell right half part adds the design thickness of arenaceous shell;The right sand inlet is arranged under bottom right cavity In the lower template in portion, with being connected inside bottom right cavity;The location hole is located in lower template, with the location hole pair on cope plate After standard, its interior chamber size forms arenaceous shell and sand core size adds arenaceous shell and sand core thickness;The venthole is arranged on down In template, the overflow ducts between lower middle cavity and bottom right cavity connect.
The attribute block, it is characterised in that:Including block, mark;The block is arranged in the lower die;Institute The traffic sign placement stated is on the upper surface of the block.

The half cast core, it is characterised in that:Including gate end, overflow segment, fixing end;The gate end leaks for half It is bucket-shaped, it is fixedly connected with one end of overflow segment;The overflow segment is semi-cylindrical, and one end is fixedly connected with gate end, another End is fixedly connected with fixing end;The fixing end is provided with two installation screens, is fixed in the lower die.
The inner core, it is characterised in that:Including end face, core;The end face and the shaft end of the cylinder are fixed Connection;The geomery of the geomery of the core and the cavity of sand core matches.
The cylinder is installed in the lower die, its shaft end is fixedly connected with the inner core.
The making of arenaceous shell in the step two refers to precoated sand mould being placed on arenaceous shell forming machine, inside it Precoated sand pressurized, heated sizing and solidifying is injected, form bucket tooth cast processed carries certain thickness left side geomery and bucket The cavity body that tooth first half appearance and size is identical, right side geomery is identical with bucket tooth lower half appearance and size.
Sand core in the step two, which makes, to be referred to precoated sand mould being placed on sand core forming machine, is noted inside it Enter precoated sand pressurized, heated sizing and solidifying, form the core identical with bucket tooth inside dimension shape of bucket tooth cast.

Arenaceous shell or sand core automatic moulding machine in the step two are a kind of double-station precoated sand arenaceous shell automatic moulding machines, It is characterized in that:Including right mould frame, rack, hydraulic system, mould bases mobile device, mould bases plate, compressed air system, control system System, sandbox, sand hopper, left mould frame;The right mould frame is installed on mould bases mobile device right end, including mould bases plate, and Die and mould plate, is oriented to Supporting rod;The rack includes base, and stent, the floor installation is under double-station precoated sand arenaceous shell automatic moulding machine Portion;The stent is installed on base;The hydraulic system includes hydraulic station, control element, hydraulic cylinder;The mould bases Mobile device is installed on base, including mobile work platform;The mobile work platform can on base transverse shifting;It is described Mould bases plate be installed on the both ends of left mould frame and right mould frame, be connected respectively with guiding support bar both ends;The compressed air system System includes source of the gas, air accumulator, cylinder;The control system includes controller, sensor, programmer, parameter setting apparatus; The sandbox is installed in rack;The sand hopper is installed on the top of left mould frame and right mould frame;The left fixing of the forming frame It is symmetrical in the left end and right mould frame of mould bases mobile device.
The step three refers to the precoated sand arenaceous shell that will be made and sand core combination, is poured into a mould in its inner cavity and enters proportioning symbol Close the molten iron of the fusing of bucket tooth material component requirements.
The step four be by pour be poured in molten iron precoated sand arenaceous shell cooling after it is naturally defeated and dispersed, taking-up inner casts, clearly Cast gate, riser, and residual impurity are managed, is heat-treated and is machined into next process.

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