CN105478681B - Planet carrier casting mould and casting method - Google Patents

Abstract

Planet carrier casting mold of the present invention comprises lower die, upper die, intermediate mandrel, and the cavity between described lower die, middle mandrel, upper die forms the die cavity that is used for forming planetary carrier, in described lower die The lower cavity of the planetary carrier is set on the upper surface, and the lower cavity of the planetary carrier includes a positioning groove in the middle of the lower mold and a chilling zone, and the chilling zone includes the chilling groove and the chilling material filled in the chilling groove. The cooling groove is facing the waist-shaped cavity of the middle mandrel. The bottom of the waist-shaped cavity is the hot spot of the formed planet carrier. By opening the cooling groove and filling the cooling material here, the The cooling speed of molten iron is slow, the cooling effect is mild, the heat is released slowly, and the formed structure is dense and uniform without defects.

Description

Planet carrier casting mold and casting method

technical field

The invention relates to the technical field of coated sand casting, in particular to a planet carrier casting mold and a casting method.

Background technique

The planet carrier is a kind of transmission device, including an upper bottom, a lower bottom, and a hollow waist-shaped column connected between the upper bottom and the lower bottom. The planet carrier is usually formed by sand casting.

Due to the special structure of the planet carrier, the connection between the hollow waist column and the lower bottom, that is, the bottom of the hollow waist column, becomes the hot spot during pouring. When the hot spot is cooled by cold iron or graphite, due to cold The cooling speed of iron or graphite is fast, which will drive the defects of the hot joints to the inside of the hot joints. There is no defect at the bottom of the hot spot, but due to the heat concentration inside the hot section, obvious shrinkage and defects will be formed.

Contents of the invention

It is necessary to propose a casting mold for the planet carrier that can slowly and gently cool the molten iron at the hot spot of the planet carrier.

It is also necessary to propose a method for casting the planet carrier using the planet carrier casting mold.

A planet carrier casting mold, comprising a lower mold, an upper mold, and an intermediate core mold, the intermediate core mold is assembled between the lower mold and the upper mold, and the cavity between the lower mold, the intermediate core mold, and the upper mold consists of The cavity for molding the planet carrier, the lower cavity of the planet carrier is set on the upper surface of the lower mold, the lower cavity of the planet carrier includes the middle positioning groove of the lower mold and the chilling zone, and the chilling zone includes a chilling zone. The quenching material filled in the cold groove and the quenching groove, the surface of the quenching groove filled with the quenching material and the upper surface of the lower mold are in the same plane, and the lower surface of the upper mold is provided with an upper cavity on the planet carrier , the upper cavity of the planetary carrier includes the middle positioning core of the upper mold and the waist-shaped core, the middle core includes the middle fixed core and the waist-shaped cavity, and the cooling groove of the lower cavity of the planetary carrier is opposite to The waist-shaped cavity of the middle mandrel, the middle positioning groove of the lower mold of the lower mold is aligned up and down with the middle fixed core of the middle mandrel, and the middle positioning core of the upper mold of the upper mold is also aligned with the middle fixed core of the middle mandrel. The head is aligned up and down, and the waist-shaped core mold of the upper mold, the waist-shaped cavity of the middle core mold, and the chilling groove of the lower mold are aligned up and down.

A method for casting a planet carrier using a planet carrier casting mold, comprising the following steps:

Clean up the upper and lower molds;

Mix pearl sand, steel shot, and iron ore powder with water glass to obtain the chilling material, fill the chilling tank of the lower mold with the chilling material, fill and scrape the chilling material, and then use carbon dioxide to dry the chilling area , solidified, and then scrape the refractory coating with 0.2mm to 0.3mm on the upper surface of the chilled material;

Clean the middle mandrel and align it with the upper and lower dies;

Combine sprue tube and sprue cup, then pour, form and cool.

In the above casting mold and casting method for the planetary carrier, the cavity between the lower mold, the middle mandrel and the upper mold forms a cavity for molding the planetary carrier, and the lower cavity of the planetary carrier is set on the upper surface of the lower mold, The lower cavity of the planetary carrier includes a positioning groove in the middle of the lower mold and a chilling zone, the chilling zone includes the chilling groove and the chilling material filled in the chilling groove, and the chilling groove is facing the waist of the middle mandrel Shaped cavity, the bottom of the waist-shaped cavity is the hot section of the formed planet carrier. By setting up a chilling groove and filling the chilling material here, the cooling speed of the molten iron here is slow and the cooling effect is mild. The heat dissipates slowly, and the formed tissue structure is dense and uniform without defects.

Description of drawings

Fig. 1 is a structural schematic diagram of the planet carrier casting mold.

Fig. 2 is a structural schematic diagram of the lower die.

Fig. 3 is a structural schematic diagram of the upper mold.

Fig. 4 is a structural schematic diagram of the intermediate mandrel.

Fig. 5 is a schematic structural view of the combination of the lower mold and the middle core mold.

Fig. 6 is a schematic structural diagram of the planet carrier.

In the figure: planet carrier casting mold 1, lower mold 11, planet carrier lower cavity 111, lower mold intermediate positioning groove 1111, chilling groove 1112, lower mold small core head 1113, upper mold 12, planet carrier upper cavity 121, Middle positioning core head 1211 of the upper mold, waist-shaped core mold 1212, small core head 1213 of the upper mold, middle core mold 13, middle fixed core head 131, waist-shaped cavity 132, round core head 133, gate tube 2, gate Cup 3, runner system cavity 4, planet carrier 5, hollow waist column 51.

detailed description

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

Referring to Fig. 1 to Fig. 6, planet carrier casting mold 1 comprises lower mold 11, upper mold 12, middle mandrel 13, middle mandrel 13 is assembled in the middle of lower mold 11 and upper mold 12, lower mold 11, middle mandrel 13 1. The cavity between the upper mold 12 forms the cavity for forming the planet carrier 5, and the lower mold cavity 111 of the planet carrier is set on the upper surface of the lower mold 11. The lower mold cavity 111 of the planet carrier includes the middle positioning groove 1111 of the lower mold and the excitation Cooling zone, the quenching zone comprises the quenching groove 1112 and the quenching material filled in the quenching groove 1112, the surface of the quenching groove 1112 filled with the quenching material and the upper surface of the lower mold 11 are in the same plane, that is, facing The bottom of the hollow waist-shaped column 51 of the formed planet carrier 5, the lower surface of the upper mold 12 is provided with an upper mold cavity 121 for the planet carrier, and the upper mold cavity 121 for the planet carrier includes a central positioning core head 1211 and a waist-shaped mandrel 1212 in the upper mold. , the middle mandrel 13 includes a middle fixed core head 131 and a waist-shaped cavity 132, the cooling groove 1112 is facing the waist-shaped cavity 132 of the middle mandrel 13, the middle positioning groove 1111 of the lower mold of the lower mold 11 and the middle mandrel 13 The middle fixed core head 131 of the upper mold 12 is aligned up and down, and the middle fixed core head 1211 of the upper mold 12 is also aligned up and down with the middle fixed core head 131 of the middle mandrel 13. The waist-shaped mandrel 1212 of the upper mold 12, the middle mandrel The waist-shaped cavity 132 of 13 and the chilling groove 1112 of the lower mold 11 are aligned up and down.

Further, the shape of the quenching groove 1112 is a trapezoidal long groove, and the upper and lower sides of the trapezoidal long groove are inferior arcs, and the lengths of the upper and lower sides are all greater than the width of the waist-shaped cavity 132 of the middle mandrel 13, and the depth of the trapezoidal long groove is 10mm ~ 15mm. The width of the waist-shaped cavity 132 of the middle mandrel 13 is the width of the hollow waist-shaped column 51 of the cast planet carrier, and the depth of the trapezoidal long groove, the length of the upper side, and the length of the lower side are based on the hollow waist-shaped column of the planet carrier 5 51, when the length and depth of the trapezoidal long groove are designed reasonably, the chilling material filled in it can fully exert the chilling effect, so that when the molten iron poured here forms the bottom of the hollow waist-shaped column 51, it will be slow and gentle cool down.

Further, the length of the lower side is three times of the width of the waist-shaped cavity 132 of the middle mandrel 13, and the two ends of the quenching zone are equal to the distances of the two ends of the waist-shaped cavity 132 of the middle mandrel 13, and this distance is the same as that of the middle core. The waist-shaped cavity 132 of the mold 13 has the same width. For example, the width of the waist-shaped cavity 132 of the middle mandrel 13 is 20mm, the length of the lower side of the chilling groove 1112, that is, the length of the chilling groove 1112 is 60mm, and the two ends of the chilling groove 1112 to the middle mandrel 13 The distance between both ends of the waist-shaped cavity 132 is 20 mm.

Further, the planet carrier lower cavity 111 of the lower mold 11 also includes a lower die small core head 1113, the planet carrier upper cavity 121 of the upper die 12 also includes a upper die small core head 1213, and the middle core mold 13 also includes a round core head 133 , the small core head 1113 of the lower mold of the lower mold 11 is aligned up and down with the round core head 133 of the middle mandrel 13, and the small core head 1213 of the upper mold of the upper mold 12 is aligned up and down with the round core head 133 of the middle mandrel 13, so that The middle core mold 13, the upper mold 12 and the lower mold 11 are fixed in position.

Further, the chilling zone is three, and the three chilling zones include three chilling grooves 1112, the upper mold 12 includes three waist-shaped mandrels 1212, the middle mandrel 13 includes three waist-shaped mold cavities 132, and the upper mold 12 The three waist-shaped mandrels 1212, the three waist-shaped cavities 132 of the middle mandrel 13, and the three quenching zones of the lower mold 11 are aligned up and down respectively. Of course, according to the number of hollow waist-shaped columns 51 of the planet carrier 5 that needs to be formed, the waist-shaped cavity 132 of the middle mandrel 13 is designed to be at least one, correspondingly, the waist-shaped mandrel 1212 of the upper mold 12, the lower mold 11 chills are also at least one, so as to be suitable for the production of various types of planetary carriers.

Further, the present invention also proposes a planetary carrier casting mold 1 capable of molding four planetary carriers 5 at one time, four planetary carrier lower cavities 111 are symmetrically arranged on the upper surface of the lower mold 11, and the four planetary carrier lower cavity 111 There is no connection between them, and four planet carrier upper cavities 121 and one runner system cavity 4 are set on the lower surface of the upper mold 12. The runner system cavity 4 communicates with the four planet carrier upper cavities 121 respectively, and the middle core There are also four molds 13, which are respectively arranged corresponding to the four planet carrier lower cavities 111 of the lower die 11 and the four planet carrier upper cavities 121 of the upper mold 12. The four planetary carrier lower cavities 111, the four planetary carrier upper cavity 121, and the four intermediate mandrels 13 have the same structure. Between the four planet carrier lower cavities 111 of the mold 11 and the four planet carrier upper cavities 121 of the upper mold 12, they are aligned up and down. After pouring and molding, four planet carriers 5 are simultaneously cast and formed, which greatly improves production efficiency.

Further, the chilling material is formed by mixing pearl sand, steel shot, and iron ore powder with water glass.

The present invention also proposes a method for casting a planetary carrier using a planetary carrier casting mold 1, comprising the following steps:

Clean up upper mold 12 and lower mold 11;

Mix pearl sand, steel shots, and iron ore powder with water glass to obtain chilled material, fill the chilled material in the chilled tank 1112 of the lower mold 11, fill and smooth the chilled material, and then use carbon dioxide to seal the chilled area. Blow dry, solidify, and then scrape the refractory coating with 0.2mm to 0.3mm on the upper surface of the chilled material;

Clean up the middle mandrel 13, and align it with the upper mold 12 and the lower mold 11;

Combine sprue pipe 2 and sprue cup 3, then pour, form and cool.

Claims (8)

1. a kind of planet carrier casting mould, it is characterised in that：Including lower mould, upper mould, intermediate core mole, intermediate core mole is assembled to institute State in the middle of lower mould and upper mould, the lower mould, the cavity between intermediate core mole, upper mould constitute the die cavity for being molded planet carrier, Planet carrier lower impressions are set on the upper surface of the lower mould, and the planet carrier lower impressions include lower mould interfix groove and Quench Area, the chill zone includes the chill material of filling in Quench groove and Quench groove, fill the Quench groove of chill material surface and The upper surface of the lower mould in the same plane, sets planet carrier upper impression, on the planet carrier on the lower surface of the upper mould Die cavity includes upper mould interfix core print and kidney-shaped core, and the intermediate core mole includes middle fixed core print and kidney-shaped die cavity, institute The Quench groove of planet carrier lower impressions is stated just to the kidney-shaped die cavity of intermediate core mole, the lower mould interfix groove and intermediate core of the lower mould The fixed core print in centre of mould is aligned up and down, and the upper mould interfix core print of upper mould is also upper and lower with the fixed core print in the centre of intermediate core mole Align, the kidney-shaped core of the upper mould, the kidney-shaped die cavity of intermediate core mole, the Quench groove of lower mould are aligned up and down.

2. planet carrier casting mould as claimed in claim 1, it is characterised in that：The Quench groove is shaped as trapezoidal elongated slot, The bottom and upper segment of the trapezoidal elongated slot is minor arc, and the length of the bottom and upper segment is all higher than the kidney-shaped die cavity of intermediate core mole Width, the depth of the trapezoidal elongated slot is 10mm~15mm.

3. planet carrier casting mould as claimed in claim 2, it is characterised in that：The following length is the waist of intermediate core mole Three times of the width of shape die cavity, also, the distance at two ends to the two ends of the kidney-shaped die cavity of intermediate core mole of chill zone is equal.

4. planet carrier casting mould as claimed in claim 3, it is characterised in that：The planet carrier lower impressions of the lower mould also include The lower small core print of mould, the planet carrier upper impression of the upper mould also includes the small core print of upper mould, and the intermediate core mole also includes round core head, institute State the small core print of lower mould of lower mould aligned up and down with the round core head of intermediate core mole, the small core print of upper mould of upper mould and the round core of intermediate core mole Head is aligned up and down.

5. planet carrier casting mould as claimed in claim 4, it is characterised in that：The chill zone is three, and described three are swashed Cold-zone includes three Quench grooves, and the upper mould includes three kidney-shaped cores, and the intermediate core mole includes three kidney-shaped die cavities, described Three kidney-shaped cores of upper mould, three kidney-shaped die cavities of intermediate core mole, three chill zones of lower mould are aligned up and down respectively.

6. planet carrier casting mould as claimed in claim 5, it is characterised in that：It is symmetrical arranged on the upper surface of the lower mould Four planet carrier lower impressions, are not connected between four planet carrier lower impressions, are set on the lower surface of mould on described Four planet carrier upper impressions and a runner system die cavity, the runner system die cavity respectively with four planet carriers on Die cavity is connected, and the intermediate core mole is also four, four planet carrier lower impressions, the four of the upper mould respectively with the lower mould Individual planet carrier upper impression is correspondingly arranged.

7. planet carrier casting mould as claimed in claim 6, it is characterised in that：The chill material using nice foundry sand, shot, Lip river Iron Ore Powder mixing waterglass is formed.

8. a kind of method that planet carrier casting mould using as described in one of claim 1-7 casts planet carrier, its feature exists In comprising the following steps：

Upper die and lower die are cleaned out；

Nice foundry sand, shot, Lip river Iron Ore Powder are mixed into waterglass and obtains chill material, Quench material is filled in the Quench groove of lower mould Material, chill material is tamped, is struck off, and carbon dioxide is reused by chill zone drying, solidification, then in the upper surface of chill material Fireproof coating after blade coating 0.2mm~0.3mm；

Intermediate core mole is cleaned out, is aligned with upper die and lower die and is assembled together；

Gate pin and sprue cup are combined, then poured into a mould, be molded, cooled down.