CN206839046U - A kind of half cast core of bucket tooth precoated sand mould - Google Patents

Abstract

A kind of half cast core of bucket tooth precoated sand mould, belongs to engineering machinery production field, including gate end, overflow segment, fixing end；Described gate end is half funnel-form, is fixedly connected with one end of overflow segment；Described overflow segment is semi-cylindrical, and one end is fixedly connected with gate end, and the other end is fixedly connected with fixing end；Described fixing end is provided with two installation screens, is fixed on described lower mould, has the production that can efficiently realize bucket tooth blank, saves material and artificial, reduces machining amount, reduce casting flaw, improve yield rate, the characteristics of easily realizing automated production.

Description

A kind of half cast core 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 Half cast core.

Background technology

Bucket tooth is the important easily 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, then it is 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, selects suitable die joint, makes profile and bucket tooth shape Shape identical built-up pattern, 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 shape and model identical cavity are formed among the sand in sandbox, then produces casting and lead to Road and rising head just complete the sand mold before casting and made；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, 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, the blank for resulting in casting out Appearance and size is not known；The characteristics of due to process above, it is big the operation amount of labour to be present in its casting method, 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 above mentioned 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 core model；3rd, pour into a mould；4th, Take out casting and clear up.

Bucket tooth precoated sand mould described in described step one refers to be used to make arenaceous shell using ferrous materials are manufactured With the mould of the model of core；It is characterized in that：Including upper mould, lower mould, attribute block, half pours into a mould 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 formed it is 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 described shape of upper levorotation chamber and the die joint of core Upper part 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 forms arenaceous shell and core size adds 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 connect.

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 connects 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 forms arenaceous shell and core size adds 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 connect.

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；Described end face and the shaft end of described cylinder are 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, Die and mould plate, is oriented to Support bar；Described frame includes base, and 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 both ends of left mould frame and right mould frame, be connected respectively with guiding support bar both 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, is poured into a mould in its inner chamber and 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, save material and artificial, reduction machine Tool processing capacity, casting flaw is reduced, improve yield rate, easily realize automated production.

Brief description of the drawings

Fig. 1 is the structural representation of bucket tooth in the present invention

A. crown；B. pin shaft hole.

Fig. 2 is the structural representation of bucket tooth precoated sand mould

Mould on 1.；2. lower mould；3. attribute block；4. half cast core；5. inner core；6. cylinder.

Fig. 3 is the structural representation of upper mould

10. cope plate；Levorotation chamber on 11.；12. left sand inlet；13. mounting hole；Middle die cavity on 14.；Sand inlet in 15.； 16. upper right die cavity；17. right sand inlet；18. positioning hole；19. passage.

Fig. 4 is the structural representation of lower mould

20. lower template；21. bottom left die cavity；22. left sand inlet；23. mounting hole；24. die cavity in lower；Sand inlet in 25.； 26. bottom right die cavity；27. right sand inlet；28. positioning hole；29. passage.

Fig. 5 is the structural representation of attribute block

31. block；32. mark.

Fig. 6 is the structural representation of half cast core

41. gate end；42. overflow segment；43. fixing end.

Fig. 7 is the structural representation of inner core

51. end face；52. core body.

Fig. 8 is the structural representation of arenaceous shell and core

61. arenaceous shell；62. core.

Embodiment

In order to further illustrate technical scheme, in conjunction with embodiment of the invention is illustrated, such as Fig. 1 to Fig. 8, according to the design drawing of bucket tooth, in this example by taking the bucket tooth of 360 excavators as an example, the appearance and size of bucket tooth is put 8-12 millimeters greatly, bucket tooth precoated sand mould is made, the horizontal centre plane of bucket tooth is selected in this example as cast die joint, to divide Type face is boundary, in order to improve operating efficiency, is used in this example and makes the first half of bucket tooth and the sand of lower half simultaneously per mold Shell and whole core；And bucket tooth precoated sand mould is produced into upper mould 1 with respectively centered on the die joint of the core of bucket tooth Mould 2, and attribute block 3, half pours into a mould core 4, inner core 5；The steel plate of 50 millimeters of thickness is used in this example on upper mould 1 as cope plate 10, produce levorotation chamber 11, left sand inlet 12, mounting hole 13, upper middle die cavity 14, middle sand inlet respectively on cope plate 10 15, upper right die cavity 16, right sand inlet 17, positioning hole 18, passage 19, and be engaged with lower mould 2, equally select 50 millimeters of thickness Steel plate make the lower template 20 of lower mould 2, and produce bottom left die cavity 21 respectively in lower template 20, left sand inlet 22, installation Hole 23, lower middle die cavity 24, middle sand inlet 25, bottom right die cavity 26, right sand inlet 27, positioning hole 28, passage 29, by the upper He of mould 1 The lower die cavity open face of mould 2 is relative to be closed up, and is inserted positioning hole 18 and positioning hole 28 respectively using alignment pin, is fixed its position, Form bucket tooth precoated sand mould；Using when, by the mould bases of the bucket tooth precoated sand mould installion made to arenaceous shell automatic moulding machine On, using double arenaceous shell core forming machine in this example, by bucket tooth precoated sand mould installion in arenaceous shell core forming machine On the mould bases of left side；Start the control system of arenaceous shell core forming machine, the Hydraulic Cylinder mold mounting plate movement of hydraulic system makes The upper mould 3 for obtaining bucket tooth precoated sand mould is approached and compressed with lower mould 4；The control system of arenaceous shell core forming machine passes through information gathering System, instruction compression air system start and open sandbox and the passage of sand hopper so that the precoated sand matched enters sand hopper simultaneously Dies cavity is entered by the sand export of sand hopper, precoated sand is compacted under pressure, control system instruction heating system pair Mould is heated, and then heats the precoated sand in mould, is allowed to denaturation solidification, temperature sensor real-time detection heating-up temperature is simultaneously Control element is fed back to, to control the constant of heating-up temperature；After arenaceous shell and core solidify, control system instruction hydraulic system Hydraulic cylinder separates mould, takes out arenaceous shell and core, just completes the manufacturing process of arenaceous shell and core.

The arenaceous shell made and core are placed on cast place, core is put into inside arenaceous shell according to the structure of bucket tooth, The fusing molten iron matched is poured into arenaceous shell, after cooling, arenaceous shell is opened, takes out casting, cast gate and rising head are removed, and clears up Impurity on spray, just complete the production of the blank of bucket tooth.

Due to arenaceous shell and core production when automated production, can produce in enormous quantities, overcome clay-bonded sand or resin sand The complexity of moulding, a large amount of Foundry quartz sands are saved, reduce production cost and labor intensity；Arenaceous shell and core mold use simultaneously Long lifespan, overcome wooden model or the short-life shortcoming of aluminum dipping form.

Claims (1)

1. A kind of 1. half cast core of bucket tooth precoated sand mould, it is characterised in that：Including gate end, overflow segment, fixing end；Described Gate end is half funnel-form, is fixedly connected with one end of overflow segment；Described overflow segment is semi-cylindrical, and one end is consolidated with gate end Fixed connection, the other end are fixedly connected with fixing end；Described fixing end is provided with two installation screens, is fixed on bucket tooth precoated sand On the lower mould of mould.