A kind of inner core of bucket tooth precoated sand mould ⋆ by SJ SPARE PARTS

A kind of inner core of bucket tooth precoated sand mould, belongs to engineering machinery production field, including end face, core body；Described end face is fixedly connected with the shaft end of described cylinder；The geomery of the geomery of described core body and the cavity of core matches, with can efficiently realize the production of bucket tooth blank, saves material and artificial, reduces machining amount, reduce casting flaw, improves yield rate, the characteristics of easily realizing automated production.

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 Inner core.
Background technology
Bucket tooth is the important easy consumption part on excavator or loading machine, is by crown and toothholder group similar to the tooth of people Into Dipper Teeth, the two by bearing pin connect；Such as Fig. 1, the crown root of bucket tooth is usually provided with pin shaft hole, passes through bearing 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, and its casting method is, first according to bucket tooth design drawing, to select suitable die joint, makes profile and bucket tooth shape Shape identical built-up pattern, this built-up pattern mostly by boundary of die joint as built-up pattern faying face, 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, is formed shape and model identical cavity in the middle of the sand in sandbox, then to produce casting logical Road and rising head just complete the sand mold before casting and made；3rd, sand mold is carried out after appropriate drying, sandbox is closed up, will cast Molten metal is made to pour into from pouring channel；4th, sandbox is removed after cooling, sand mold is crushed, casting is taken out, 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, there is expansive force to sand mold in molten iron, and sand mold is relative It is soft, the shape of sand mold inner chamber will be caused to produce change, and this change is uncertain, results in the blank that casts out Appearance and size is not known；There is operative’s amount of labour greatly in the characteristics of due to process above, its casting method, to the skilled of workman 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 qualified low defect of yield rate..
The content of the invention
The above mentioned problem existed is produced for existing bucket tooth blank, the present invention proposes a kind of blank manufacture method of bucket tooth, 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 core model；3rd, pour into a mould；4th, Take out casting and clear up.
Bucket tooth precoated sand mould described in described step one refer to using ferrous materials be made be used for make arenaceous shell With the mould of the model of core；It is characterized in that：Including upper mould, lower mould, attribute block, half cast core, inner core, cylinder；Described The faying face of upper mould and described lower mould is the cast die joint of bucket tooth；Described upper mould is fixed with described lower mould by alignment pin Relative position；Described upper mould is relative with described lower mold cavity close up after form a set of including the bucket tooth first half and bucket tooth lower half The bucket tooth arenaceous shell profile in portion, and a set of complete bucket tooth core profile including the core first half and core lower half.
Described upper mould, it is characterised in that：Including cope plate, upper levorotation chamber, left sand inlet, mounting hole, upper middle die cavity, in Sand inlet, upper right die cavity, right sand inlet, positioning hole, passage；Described cope plate is located at the periphery of upper impression, by steel material Material is made；Described upper levorotation chamber is located at the inside left of cope plate；The shape and the die joint of core of described upper levorotation chamber Upper partial shape is identical；The appearance and size that the size of described upper levorotation chamber is equal to the part on the die joint top of core adds sand The design thickness of core；Described 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；Described upper middle die cavity is located at upper mould In the middle part of the inside of plate；The shape of described upper middle die cavity is identical with the shaped upper part of arenaceous shell left-half；Described upper middle die cavity Size be equal to arenaceous shell left-half top appearance and size add arenaceous shell design thickness；Described middle sand inlet is arranged on In upper on the cope plate on die cavity top, connected with upper medium-sized intracavitary portion；Described upper right die cavity is located at the inner right side of cope plate； The shape of described upper right die cavity is identical with the shaped upper part of arenaceous shell right half part；The size of described upper right die cavity is equal to arenaceous shell The appearance and size on the top of right half part adds the design thickness of arenaceous shell；Described right sand inlet is arranged on upper right die cavity top On cope plate, with being connected inside upper right die cavity；Described positioning hole is located on cope plate, is aligned with the positioning hole in lower template Afterwards, its interior chamber size formation arenaceous shell and core size add arenaceous shell and core thickness；Described passage is arranged on mould On plate, the overflow ducts between upper middle die cavity and upper right die cavity are connected.
Described lower mould, it is characterised in that：Including lower template, bottom left die cavity, left sand inlet, mounting hole, lower middle die cavity, in Sand inlet, bottom right die cavity, right sand inlet, positioning hole, passage；Described lower template is made up of ferrous materials, positioned at die cavity Periphery；Described bottom left die cavity is located at the inside left of lower template；Under the described shape of bottom left die cavity and the die joint of core Partial shape is identical；The appearance and size that the size of described bottom left die cavity is equal to the part of the die joint bottom of core adds core Design thickness；Described left sand inlet is arranged in the lower template of bottom left die cavity bottom, with being connected inside bottom left die cavity；It is described Mounting hole be arranged on cope plate, matched with the model sheetinstallat plate of automatic arenaceous shell forming machine；Under described lower middle die cavity is located at In the middle part of the inside of template；The shape of described lower middle die 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 bottom of arenaceous shell left-half；Described middle sand inlet is set In the lower template of lower middle die cavity bottom, medium-sized intracavitary portion is connected with；The inside that described bottom right die cavity is located at lower template is right Side；The shape of described bottom right die cavity is identical with the lower shape of arenaceous shell right half part；The size of described bottom right die cavity is equal to The appearance and size of the bottom of arenaceous shell right half part adds the design thickness of arenaceous shell；Described right sand inlet is arranged under bottom right die cavity In the lower template in portion, with being connected inside bottom right die cavity；Described positioning hole is located in lower template, with the positioning hole pair on cope plate After standard, its interior chamber size formation arenaceous shell and core size add arenaceous shell and core thickness；Described passage is arranged on down In template, the overflow ducts between lower middle die cavity and bottom right die cavity are connected.
Described attribute block, it is characterised in that：Including block, mark；Described block is arranged on described lower mould；Institute The traffic sign placement stated is on the upper surface of described block.
Half described cast core, it is characterised in that：Including gate end, overflow segment, fixing end；Described gate end leaks for half It is bucket-shaped, it is fixedly connected with one end of overflow segment；Described overflow segment is semi-cylindrical, and one end is fixedly connected with gate end, another End is fixedly connected with fixing end；Described fixing end is provided with two installation screens, is fixed on described lower mould.
Described inner core, it is characterised in that：Including end face, core body；The shaft end of described end face and described cylinder is fixed Connection；The geomery of the geomery of described core body and the cavity of core matches.
Described cylinder is arranged on described lower mould, and its shaft end is fixedly connected with described inner core.
The making of arenaceous shell in described 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 Tooth first half appearance and size is identical, right side geomery and bucket tooth lower half appearance and size identical cavity body.
Core in described step two, which makes, to be referred to precoated sand mould being placed on core forming machine, is noted inside it Enter precoated sand pressurized, heated sizing and solidifying, form bucket tooth cast with bucket tooth inside dimension shape identical core.
Arenaceous shell or core automatic moulding machine in described step two are a kind of double precoated sand arenaceous shell automatic moulding machines, It is characterized in that：Including right mould frame, frame, hydraulic system, mould bases mobile device, mould bases plate, compressed air system, control system System, sandbox, sand hopper, left mould frame；Described right mould frame is arranged on mould bases mobile device right-hand member, including mould bases plate, and Die and mould plate is oriented to Support bar；Described frame include base, support, described floor installation is under double precoated sand arenaceous shell automatic moulding machine Portion；Described support is arranged on base；Described hydraulic system includes hydraulic station, control element, hydraulic cylinder；Described mould bases Mobile device is arranged on base, including mobile work platform；Described mobile work platform can on base transverse shifting；It is described Mould bases plate be arranged on the two ends of left mould frame and right mould frame, be connected respectively with guiding support bar two ends；Described compressed air system System includes source of the gas, air accumulator, cylinder；Described control system includes controller, sensor, programmer, parameter setting apparatus； Described sandbox is arranged in frame；Described sand hopper is arranged on the top of left mould frame and right mould frame；Described left fixing of the forming frame It is symmetrical in the left end and right mould frame of mould bases mobile device.
Described step three refers to the precoated sand arenaceous shell that will be made and core combination, and in its inner chamber, cast enters proportioning symbol Close the molten iron of the fusing of bucket tooth material component requirements.
Described 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, rising head, and residual impurity are managed, is heat-treated and is machined into next process.
Beneficial effect
The beneficial effects of the present invention are can efficiently realize the production of bucket tooth blank, saving material is with manually, and reduction machinery adds Work amount, reduces casting flaw, improves yield rate, easily realizes automated production.