CN203830665U - Novel casting pattern structure of automobile brake disc - Google Patents

Abstract

The utility model discloses a novel casting pattern structure of an automobile brake disc. The novel casting pattern structure is formed by compounding two outer models and a sand core, wherein the sand core is positioned in the outer models. The strength, toughness, weather resistance and processability of a rear brake disc of an automobile are improved. A micro alloy ring is arranged on an R corner part, in which internal shrinkage is easily generated, in a casting pattern, and the strength and toughness of a casting are improved. The castings are molded through a sand mold and the sand core, a pouring system is positioned inside the sand core, and due to reasonable arrangement of a ceramic filter, an annular melt inlet piece, a chiller and a riser of the pouring system, the defects of the casting are improved, and the product quality is improved.

Description

The novel casting model structure of automobile brake disc

Technical field

The utility model relates to a kind of auto parts and components, especially relates to a kind of novel casting model structure of automobile brake disc.

Background technology

At present, at home and abroad, in casting industry, automatic moulding production line is divided into two kinds according to the unusual of parting method, i.e. horizontal moulding line and vertical moulding line.After solid construction, brake disc is due to without inner cavity configuration, thus while generally producing without core, only need be by sand mold molding.But in vertical modeling line is produced, the place, R angle that the foundry goods that this conventional method is produced is connected with fitting surface at brake lining can tend to exist inner shrinkage defect.In brake disc loading process, due to the existence of this place shrinkage porosite, can make brake disc because stressed concentrating produces fracture tendency.Thereby brake disc is difficult to produce in enormous quantities at vertical modeling line after solid series, thereby become a great problem of domestic and international casting industry vertical modeling line.

Summary of the invention

The purpose of this utility model is to provide a kind of novel casting model structure of automobile brake disc, with brake disc after improving existing solid construction, on vertical modeling line, produce R angle, the inside shrinkage defect being produced, there is stressed fracture tendency in brake disc, braking procedure poor stability, the technical problem such as production efficiency is low.

The utility model mainly solves the problems of the technologies described above by following technical proposals: a kind of novel casting model structure of automobile brake disc, by two external models and a core, be composited, and wherein core is positioned in the middle of external model;

Described core is combined into by the identical core model correspondence of two block structures, two ends, described core model left and right are provided with pilot pin, core model lateral surface central area has round boss, the circle centre position of this round boss is provided with the core centre bore that runs through core model, on the center line between core model inner side, two pilot pins, being provided with cross section is semicircle sprue, sprue bottom is communicated with sand mold centre bore, at sprue end, is provided with ceramic filter; Chill groove is established at the position that easily produces R angle shrinkage porosite near foundry goods in core inner side, in this chill groove, is placed with chill; Described core sidepiece is also provided with core steam vent;

In described external model, die cavity and described core outer shape are coincide, two ends, described interior die cavity left and right are provided with the locating hole identical with pilot pin, the outer rim of interior die cavity is provided with cross gate, cup, described cup is communicated with cross gate, the end outlet of this cross gate docks with the sprue entrance in core model, in described external model, die cavity outer rim is also provided with rising head, core blast pipe, the blast pipe being connected with die cavity, described blast pipe is connected with rising head, and the mouth of pipe of described core blast pipe is connected with core steam vent;

Place, the described R angle at core model round boss and core model lateral surface binding site, is arranged with microalloy ring.

?as preferably, near described core centre bore, be provided with reinforcement.

As preferably, the internal diameter of described microalloy ring is equal to or greater than round boss external diameter, and its sectional area is 9mm2-81mm2.

The utility model is in conjunction with automobile-used high-grade parts characteristic, selected multiple microalloy element carries out rational proportion, polymethyl methacrylate (EPMMA) resin is the material of asepsis environment-protecting, rare earth metal Ce can reduce the harm of the low melting points such as Sn in foundry goods, is formed with and is beneficial to the high-melting-point substances that improves cast properties.Rare-earth metal La can crystal grain thinning, reduces S and P in the segregation of crystal boundary, purifies the impact flexibility that crystal boundary improves foundry goods.The microalloy ring set that above-mentioned material is made is contained in the place, R angle of round boss, under the effect of molten iron, the compositions such as Ce wherein, La, Nb are along with the disappearance of microalloy ring, be diffused in gradually near the R angle of foundry goods, therefore greatly improve near intensity and the toughness in brake disc R angle, and saved alloy material.

It is simple that the utility model method has technique, and moulding is convenient, and productivity ratio is high, the advantage that product percent of pass is high.In its sand mo(u)ld, set up core, foundry goods is by sand mo(u)ld and the common moulding of core; Running gate system is positioned at core inside, has improved the traditional method that existing running gate system is generally positioned at external mold.High temperature liquid iron is from casting machine is poured into the cup on sand mo(u)ld top, enter immediately the sprue that is positioned at core, filter energy purifying molten iron in sprue, molten iron enters core centre bore by ceramic filter, within the scope of 360 °, enter core cavity, can once cast and form two products, therefore improve production efficiency; The chill of placing in core is near easily producing the shrinkage porosite position at R angle, but contact with foundry goods, can not only regulate molten iron temperature field, solves shrinkage defect, and chill do not contact with foundry goods and avoided foundry goods generation chilling tendency yet, greatly improved the quality of product.This utility model has well been improved the deficiency of existing vertical modeling line technique, has good economic benefit.

Accompanying drawing explanation

Fig. 1 is the structural representation of sand mold;

Fig. 2 is the cutaway view of sand mold;

Fig. 3 enters the A of soup sheet to view in Fig. 2;

Fig. 4 is the structural representation of core model;

Fig. 5 is the structural representation of chill;

Fig. 6 is the generalized section of chill;

Fig. 7 is the structural representation of microalloy ring;

Fig. 8 is the schematic diagram of sand-mold molding machine.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is described in further detail.

Fig. 1 is the structural representation of core moulding, and Fig. 2 is the schematic diagram of core, and Fig. 3 is the structural representation of rear brake disc, and Fig. 4 is the structural representation of chill, and Fig. 5 is the structural representation of microalloy ring, and Fig. 6 is the schematic diagram of sand-mold molding machine.

As shown in Figure 6, the course of work of sand-mold molding machine 1 is molding sand 12 to be sent into the existing common moulding machine of sand-mold molding machine 1(all can make, and moulding machine production line can be produced sand mo(u)ld in enormous quantities continuously, highly efficient in productivity) sand hopper 11 in; Molding sand in sand hopper 11 12 is blown in moulding chamber 13, by pressure plate 14(PP plate) and back-pressure plate 15(CP plate) molding sand 12 is pushed, reach default force value, make molding sand 12 reach desirable hardness and shape, make sand mold 16; Sand mold 16 is moved to the front end of moulding chamber 13, vibration CP plate makes it depart from slowly sand mold 16, and upwards balances to horizontal level, and PP plate is released moulding chamber 13 by sand mold 16, vibration PP plate is to make it depart from sand mold 16, and then PP plate returns to the original position of moulding chamber 13; Under CP plate, swing back original position, close moulding chamber 13, to make next sand mold 16; The sand mold 16 of making is fed forward by casting mould conveyor line, is convenient to the continuous pouring practice of rear batch.

The production method of novel casting model structure and the preparation method of brake disc are:

A. prepare core: referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, core 201 is combined into by identical core model 2 correspondences of two block structures, core model 2 is prepared by sand-mold molding machine 1, at core model 2 two ends, left and right, be provided with pilot pin 21, core model 2 outsides have round boss 20, the circle centre position of round boss 20 is provided with the core centre bore 22 that runs through core model 2, in core model 2 inner sides, it is semicircle sprue 23 that center line between two pilot pins 21 is provided with cross section, sprue 23 bottoms are communicated with sand mold centre bore 22, the end of sand mold centre bore 22 is provided with into soup sheet 4, this enters soup sheet and the die cavity of interior external model can be connected.

At sprue 23 ends, be provided with ceramic filter 24; Chill groove 25 is established at the position that easily produces R angle shrinkage porosite near foundry goods in core 201 inner sides, in this chill groove 25, is placed with chill 26; Core sidepiece is also provided with core steam vent 27, is provided with reinforcement 28 near core centre bore 23;

B. prepare external model: use sand-mold molding machine 1 to prepare external model 3, the interior die cavity of this external model 3 and core 201 outer shape are coincide, two ends, interior die cavity left and right are provided with the locating hole 31 identical with pilot pin 21, the outer rim of interior die cavity is provided with cross gate 32, cup 33, cup 33 is communicated with cross gate 32, the end outlet of this cross gate 32 docks with sprue 23 entrances in core model 2, the interior die cavity outer rim of external model 3 is also provided with the rising head 34 being connected with die cavity, core blast pipe 35, blast pipe 36, blast pipe 36 is connected with rising head 34, the mouth of pipe of core blast pipe 35 is connected with core steam vent 27,

C. prepare molten iron: embodiment 1: iron material (P≤0.1%, S≤0.1%) is dropped in furnace cupola, be warming up to 1450 ℃, after raw material liquefies completely, add C3.6%, Si1.6%, Mn0.5%, Ni0.2%, Cr0.2%, Mo0.05%, Cu0.3%, Ti0.03%, B0.1%, V0.2%, Zr0.15%, the injection casting machine insulation of then molten iron being come out of the stove is standby;

D. model combination: place annular at core centre bore 22 and enter soup sheet 4, two external models 3 are symmetricly set on to the left and right sides of core 201, make the locating hole 31 of external model 3 and pilot pin 21 fits of core 201, merge two external models 3, so in the middle of core 201 is interposed in; By microalloy ring 5(as shown in Figure 5) be placed on the place, R angle of core model round boss 20.The internal diameter of described microalloy ring 5 is equal to or greater than round boss 20 external diameters, and its sectional area is 9mm2-81mm2.

E. workpiece cast: the sprue 23 by core 201 inside, to pouring molten iron in sand mold, occurs after molten iron until rising head 34, stop casting, form removal after it is cooling, removes attachment and burr on foundry goods, obtains brake disc after high strength after finishing size.

The making of microalloy ring: by expandability polymethyl methacrylate (EPMMA) and Ce0.1-0.2%, La0.1-0.2%, Nb 0.01-0.03%, Ta0.01-0.02% (ratio of brake disc gross weight) mixes, and after melting, by mould, makes microalloy ring.

In order to verify the utility model effect, utility model people has done contrast test:

sample preparation: 1. sample 1,2,3 rear brake discs: adopt respectively the utility model Mold Making.2. brake disc after comparative example: adopt existing technique, existing mold to make (Mn0.9%, Ni0.2%, Cr0.2%, Mo0.04%, Cu0.3%, surplus is iron (P≤0.1%, S≤0.1%) for elemental composition ratio: C3.8%, Si82.2%).

testing result: see the following form.

By above testing result, can find, the characteristics such as rear brake disc intensity prepared by employing the utility model, hardness, wearability are all better than existing product, can meet user demand.

Finally, it should be pointed out that the above specific embodiment is only the more representational example of the utility model.Obviously, the utility model is not limited to the above-mentioned specific embodiment, can also have many distortion.Any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done the above specific embodiment, all should think and belong to protection domain of the present utility model.

Claims (2)

1. a novel casting model structure for automobile brake disc, is characterized in that being composited by two external models and a core, and wherein core is positioned in the middle of external model;

Described core is combined into by the identical core model correspondence of two block structures, two ends, described core model left and right are provided with pilot pin, core model lateral surface central area has round boss, the circle centre position of this round boss is provided with the core centre bore that runs through core model, on the center line between core model inner side, two pilot pins, being provided with cross section is semicircle sprue, sprue bottom is communicated with sand mold centre bore, at sprue end, is provided with ceramic filter; Chill groove is established at the position that easily produces R angle shrinkage porosite near foundry goods in core inner side, in this chill groove, is placed with chill; Described core sidepiece is also provided with core steam vent;

In described external model, die cavity and described core outer shape are coincide, two ends, described interior die cavity left and right are provided with the locating hole identical with pilot pin, the outer rim of interior die cavity is provided with cross gate, cup, described cup is communicated with cross gate, the end outlet of this cross gate docks with the sprue entrance in core model, in described external model, die cavity outer rim is also provided with rising head, core blast pipe, the blast pipe being connected with die cavity, described blast pipe is connected with rising head, and the mouth of pipe of described core blast pipe is connected with core steam vent;

Place, the described R angle at core model round boss and core model lateral surface binding site, is arranged with microalloy ring.

2. the novel casting model structure of automobile brake disc according to claim 1, is characterized in that being provided with reinforcement near described core centre bore.