CN208483182U

CN208483182U - A kind of balance sand core exhaust structure of hollow clump weight casting

Info

Publication number: CN208483182U
Application number: CN201820503077.4U
Authority: CN
Inventors: 纪汉成; 原金胜
Original assignee: Liyang City Lianhua Machinery Manufacturing Co Ltd
Current assignee: Liyang City Lianhua Machinery Manufacturing Co Ltd
Priority date: 2018-04-10
Filing date: 2018-04-10
Publication date: 2019-02-12
Anticipated expiration: 2028-04-10

Abstract

The utility model discloses a kind of balance sand core exhaust structures of hollow clump weight casting, it is formed by two hemihedrism sand core gluings, including two annular sand cores, the straight core print of cylinder, rectangular positioning core print and gas outlet, it further includes arbor, nylon exhaust rope, it is vented item and multiple gas vents, described two annular sand cores are symmetrical, and it is respectively used for forming the cavity of two clump weight casting, two annular sand cores are connected as one by the straight core print of cylinder and rectangular positioning core print, and as transition connection and location structure, the gas outlet is arranged at rectangular positioning core print center, and it is connected with the exhaust passage of sand core two sides, the arbor is embedded in sand core, and nylon exhaust rope is applied on arbor, the exhaust item is embedded in sand core, and together with arbor horizontal connection, the multiple gas vent is along annular sand core vertical distribution.

Description

A kind of balance sand core exhaust structure of hollow clump weight casting

Technical field

The utility model belongs to casting technology field, and in particular to a kind of balance sand core exhaust knot of hollow clump weight casting Structure.

Background technique

Clump weight is the important spare part in excavating machinery engine, it plays damping balanced action to engine, has sky The design feature of the heart, uniform wall thickness, and the cavity of casting is larger, an only small cylindrical outlet, so if sand core slightly Offset or sand core exhaust are not smooth, will result in casting section thickness deviation, and casting generates stomata, scraps casting, therefore, sand The accurate positionin and exhaust of core are unimpeded, are the key that casting techniques.

Traditional process program is one sand core of a casting, and since the cavity sand core of casting is larger, weight is larger, sand core Unilateral positioning states are in inside type chamber, the sand core for forming casting cavity part is in cantilever position, in order in lower core process In be capable of fixing sand core, it is necessary that core print has enough length and weight that could match with the sand core for forming casting cavity part Weight, can be only achieved weight balancing, and otherwise sand core can not be fixed, and so increases the manufacturing cost of sand core, also increases The area occupied of single part casting mold can arrange two casting in one pair of sandbox originally, but since core print occupies casting mold face It accumulates and can only arrange a casting, greatly reduce productivity；Simultaneously as sand core is in unilateral positioning states, make sand core It cannot position well and cause rate of wasted casting product excessively high, increase the production cost of casting.Furthermore the casting of clump weight casting Furan resin-sand molding and core making is generally used, if the exhaust of cavity sand core is not smooth, furane resins sand core generates a large amount of when casting Gas be difficult to be discharged, casting be easy for generate gas hole defect, cause casting to be scrapped.

Summary of the invention

The utility model aim is to provide a kind of balance of hollow clump weight casting for overcome the deficiencies in the prior art Sand core exhaust structure.

In order to achieve the above objectives, the technology employed by the present utility model is being formed by two hemihedrism sand core gluings, packet Two annular sand cores, the straight core print of cylinder, rectangular positioning core print and gas outlet are included, it further includes arbor, nylon exhaust rope, exhaust item And multiple gas vents, it is characterised in that: described two annular sand cores are symmetrical, and are respectively used for forming two clump weight casting Cavity, two annular sand cores are connected as one by the straight core print of cylinder and rectangular positioning core print, and as transition connection and Location structure, the gas outlet is arranged at rectangular positioning core print center, and is connected with the exhaust passage of sand core internal two sides, described Arbor is embedded in sand core, and by nylon exhaust rope be applied on arbor, the exhaust item is embedded in sand core, and with arbor water Together, the multiple gas vent is along annular sand core vertical distribution for flushconnection.

Preferably, the shape of the arbor and material are two sides semicircle round steel, and centre passes through the axial activity of straight round steel Connection.

Preferably, the exhaust item is vented item using foamed plastics, and vaporization forms exhaust passage after casting.

Preferably, sand core two sides semicircle round steel arbor is arranged in the multiple gas vent and foamed plastics is vented the upper of item Side or lower section.

Preferably, the gas outlet is total exhaust passage mouth, and sand core two sides are vented the exhaust duct that item is formed and nylon is arranged The exhaust duct and multiple gas vents that gas rope is formed all are connected to gas outlet.

Compared with prior art, the utility model has the beneficial effects that

The utility model structure is relatively simple, easy to make, and sand core strength is high, and the exhaust passage of cavity sand core is unimpeded, has Effect prevents casting from generating gas hole defect, and lower core accurate positioning, sand core can autobalance, effectively prevent casting to generate wall thickness inclined Poor defect, while core print length is shortened, two casting can be arranged in a sandbox, improve productivity.

Detailed description of the invention

Attached drawing 1 is the balance sand core exhaust structure cross-sectional view of the hollow clump weight casting of the utility model；

Attached drawing 2 is the overhead sectional view of Fig. 1.

Wherein, 1-sand core；11-upper half sand cores；12-lower half sand cores；13-annular sand cores；14-cylinder core prints；15— Rectangular positioning core print；2-casting molds；21-mo(u)ld top halves；22-mo(u)ld bottom halves；3-cavitys；4-arbors；41-semicircle round steel；42— Straight round steel；5-nylon exhaust rope；6-exhaust items；7-gas vents；8-gas outlets；9-ventholes；10-divide core face.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, belongs to the protection scope of the utility model.

Referring to Fig.1, Fig. 2, a kind of balance sand core exhaust knot of hollow clump weight casting provided by the embodiment of the utility model Structure is formed by upper half sand core 11 and the symmetrical gluing of lower half sand core 12, including two annular sand cores 12, the straight core print 14 of cylinder, rectangular Core print 15 and gas outlet 8 are positioned, it further includes arbor 4, nylon exhaust rope 5, exhaust item 6 and multiple gas vents 7.

In the utility model embodiment, hollow clump weight casting molding and core making technique, a mould two pieces, using furan resin-sand Molding and core making, casting mold 2 include mo(u)ld top half 21 and mo(u)ld bottom half 22, are equipped with a whole disjunctor cavity sand core 1 and one in the inside of casting mold 2 Total gas outlet 8 is equipped with venthole be connected to total gas outlet 8 in mo(u)ld top half 21, sand core 1 and upper casting mold and lower casting mold formation cavity 3 and Casting section thickness.

As shown in Figure 1 and Figure 2, two annular sand cores 13 are symmetrical, and are respectively used for forming the sky of two clump weight casting Two annular sand cores 13 are connected as one by chamber 3, the straight core print 14 of cylinder and rectangular positioning core print 15, and are connected and determined as transition Bit architecture, it is ensured that 1 accurate positioning of sand core and sand core 1 balance, and prevent casting section thickness deviation from causing waste product.

According to the hollow lesser feature in outlet of the global shape structure and casting of sand core 1, the shape of arbor 4 and material are set It is calculated as two sides semicircle round steel 41, centre is flexibly connected by the way that straight round steel 42 is axial.1 intensity of sand core is improved in this way, is poured Afterwards convenient for taking out arbor 4 from casting cavity 3, to reuse.

According to the design feature of casting annular sand core 13, in dividing on core face 10 through special annular socket mould for sand core 1 Tool makes annular groove and 12 vertical φ 8mm gas vents 7.

Nylon exhaust rope 5 is applied on arbor 4, and is embedded in annular groove and resin sand core 1 together with arbor 4, is poured Exhaust passage is formed after note.

Foamed plastics exhaust item 6 is embedded in annular groove and is connected with semicircle 41 arbor level of round steel, shape after casting At exhaust passage.

Gas outlet 8 is arranged at rectangular 15 center of positioning core print, and is connected with the exhaust passage of 1 two sides of sand core, i.e. sand core 1 The gas for being poured generation is vented exhaust passage, exhaust item 6 that rope 5 is formed by nylon on multiple vertical gas vents 7 and arbor 4 and is formed Exhaust passage be discharged by total gas outlet 8, then be discharged to outside type chamber by the venthole 9 of casting mold mo(u)ld top half 21, effectively protected Demonstrate,proved sand core 1 be vented it is unimpeded, prevent casting generate stomata.

The production method of the balance sand core exhaust structure the following steps are included:

(1) resin sand core mould, annular socket mold and arbor 4 are made；

(2) upper half sand core 11 and lower half sand core 12 are made, core mould is horizontally arranged, the tamping of filling furan resin-sand is simultaneously Edge divides core face 10 to strike off；

(3) annular groove and 12 exhausts are extruded using annular socket mold on 1 two sides annular sand core of sand core, 13 surface Hole；

(4) arbor 4 that will pass through nylon exhaust rope 5 is put into annular groove；

(5) foamed plastics exhaust item 6 is put into annular groove, and be connected with semicircle 41 arbor level of round steel；

(6) arbor 4 and annular groove are filled and led up with resin sand；

(7) production of half sand core is completed in molding, finishing after hardening, upper alcohol-base paint, baking；

(8) divide on core face 10 in lower half sand core 12 and play binder, 11 pairing gluing of upper half sand core is pressed together, complete The production of integral sand core 1.

Claims

1. a kind of balance sand core exhaust structure of hollow clump weight casting, by upper half sand core (11) and lower half sand core (12) symmetrical glue It closes, including two annular sand cores (13), the straight core print of cylinder (14), rectangular positioning core print (15) and gas outlet (8), it is also wrapped Include arbor (4), nylon exhaust rope (5), exhaust item (6) and multiple gas vents (7), it is characterised in that: described two annular sand cores (13) symmetrical, and it is respectively used for forming the cavity of two clump weight casting, the straight core print of cylinder (14) and rectangular positioning Two annular sand cores (13) are connected as one by core print (15), and as transition connection and location structure, the gas outlet (8) is set It sets at rectangular positioning core print (15) center, and be connected with the exhaust passage of sand core (1) two sides, the arbor (4) is embedded in sand core (1) in, and nylon is vented rope (5) and is applied on arbor (4), the exhaust item (6) is embedded in sand core (1), and and arbor (4) together, the multiple gas vent (7) is along annular sand core (13) vertical distribution for horizontal connection.

2. a kind of balance sand core exhaust structure of hollow clump weight casting according to claim 1, it is characterised in that: institute The shape and material for stating arbor (4) are two sides semicircle round steel (41), and centre is axially flexibly connected by straight round steel (42).

3. a kind of balance sand core exhaust structure of hollow clump weight casting according to claim 1, it is characterised in that: institute Exhaust item (6) is stated using foamed plastics exhaust item (6), vaporization forms exhaust passage after casting.

4. according to claim 1 or a kind of balance sand core exhaust structure of hollow clump weight casting, feature described in 2 exist In: the multiple gas vent (7) setting is in sand core two sides semicircle round steel (41) arbor and the top of foamed plastics exhaust item (6) Or lower section.

5. a kind of balance sand core exhaust structure of hollow clump weight casting according to claim 1, it is characterised in that: institute Stating gas outlet (8) is total exhaust passage mouth, and sand core two sides are vented the exhaust duct that item (6) are formed and nylon exhaust rope (5) is formed Exhaust duct and multiple gas vents (7) be all connected to gas outlet (8).