CN1087562A

CN1087562A - Produce the method and the special-purpose metal mold thereof of cast steel roll

Info

Publication number: CN1087562A
Application number: CN 93115118
Authority: CN
Inventors: 李元平; 薛家保; 程国珊
Original assignee: Hefei Iron & Steel Corp
Current assignee: Hefei Iron & Steel Corp
Priority date: 1993-12-03
Filing date: 1993-12-03
Publication date: 1994-06-08
Anticipated expiration: 2013-12-03
Also published as: CN1036179C

Abstract

The present invention relates to a kind of method and the special-purpose metal mold thereof of producing cast steel roll in the cast molding technology, mainly is to carry out direct tempering after casting mold design, pouring plate preparation and the cooling to handle in the production method; Metal mold mainly comprises upper and lower casting mold two parts, and wherein upper mold is inner is the upper and lower cavity body that communicates, and lower mold inside also is cavity body, and upper and lower casting mold cooperates its inside, back to be shown as roll shape, and its concrete structure is reasonable in design, is convenient to the roll demoulding.The present invention can be widely used in the manufacturing of cast steel roll.

Description

Produce the method and the special-purpose metal mold thereof of cast steel roll

The present invention relates to produce in the shape casting field method and the special-purpose metal mold thereof of cast steel roll.

In the prior art, traditional cast steel roll adopts sand casting, and its basic fundamental content comprises: join sand and coating → moulding (body of roll moulding, upper and lower roll neck moulding, the moulding of rising head case) → oven dry → (checking the back) mould assembling → cast → insulation (30～70 hours) → unpacking → sand removal → cutting → heat treatment (normalizing adds tempering).This shows that sand mold moulding in traditional cast steel roll production technology, to toast, join case work miscellaneous, and also need wait for 30～70 hours after the cast and can unpack sand removal, it is serious to mistake, roll adds the tempering processing through normalizing again in addition, as seen, and the Technology for Heating Processing complexity.

In order to overcome above-mentioned the deficiencies in the prior art and defective, the present invention discloses a kind of method and special-purpose metal mold thereof of producing cast steel roll, and purpose is to avoid the sand casting and the frock thereof of complexity, simplifies heat treatment process.

In order to realize the foregoing invention purpose, the technical solution adopted in the present invention is: produce the method for cast steel roll, it comprises following process:

A: design and produce the metal mold that meets specification requirement;

B: brick flat at the cast gate of pouring plate;

C: above-mentioned metal mold and cast gate are blown clean, be placed in order on the pouring plate;

D: behind the cast roll molten steel, when roll is cooled to 860 ℃～890 ℃ in metal mold, roll can be pulled out and carry out temper.

The metal mold that uses in the said method, it is made of upper and lower casting mold, and wherein upper mold (1) is inner is the upper and lower hollow body that communicates, and the bottom of hollow cavity is a roll neck shape on the roll, the rising head of top for opening wide, the rising head latus rectum is greater than last roll neck diameter; Lower mold (2) inside is the cavity body of roll barrel and following roll neck shape, the ingate (2a) of its bottom is the passage of latus rectum less than roller neck, it communicates with pouring basin on the pouring plate (4), has on the outer wall of lower mold (2) for what lifting was used to hang (5).

The present invention compared with prior art, its technical beneficial effect shows the following aspects: at first be no longer to need molding sand and coating, saved a large amount of raw material; Next is the moulding of having avoided roll neck, condensing ring, loam core, rising head case, also need not the preceding miscellaneous programs of numerous cast such as into bakery oven dry, when roll is cooled to 860 ℃～890 ℃ in metal mold, can pull out and carry out temper, enter heat-treatment furnace after again not needing sand removal and cutting to water to emit and be heated to 860 ℃～890 ℃ and be incubated a period of time, heat treatment process is simplified.

Description of drawings

Fig. 1 is the heat treatment temperature-time plot of the cast steel roll among the present invention

Fig. 2 is the structural representation of metal mold among the present invention

The present invention is described in further detail below in conjunction with drawings and Examples

Provided the technical process of cast steel roll direct tempering among Fig. 1, promptly in the ordinary course of things roll has been heated to 650 ℃ ± 10 ℃ insulations 15 hours from 200 ℃ of heating rates with 60 ℃/hour with roll, cooled off with stove then.

Fig. 2 has provided the structure configuration signal of metal mold and pouring plate

As seen from Figure 2, metal mold comprises, lower mold two parts, wherein upper mold (1) is vertical two halves split-type structural, two branch halfbodies are last by the hole (1a) shown in Fig. 2 with merging formation one inside after the Bolt Connection, the hollow body that communicates down, the bottom of hollow body is a roll neck shape on the roll, its top is the rising head of straight-through open type, there is a chamfering transition that makes progress to connect between the two, or be similar to the version transition of chamfering, upper mold (1) and lower mold (2) both by its separately the end coincide mutually recessed, the boss pivot bush unit, both generally need not to connect firmly.The cavity of the cast steel roll body of roll and following roll neck shape is contained in lower mold (2) inside, ingate (2a) is arranged at its bottom, the up-small and down-big frustum of its likeness in form, it is gone up pouring basin with the internal cavities of lower mold (2) with pouring plate (4) and is communicated with, need also to have designed technology and hang (5) in order to lift in addition, as requested, hanging (5) can have two groups, top one group is the gudgeon formula, and following one group is ring-type.

In Fig. 2, give and stand on the cast gate iron pipe (3) that pouring plate (4) went up and be positioned at the metal mold side, molten steel can be by pouring in the cast gate iron pipe (3) from top to bottom, and go up pouring basin through pouring plate (4) and enter in the die cavity of metal mold from the ingate (2a) of metal mold bottom.

Molten steel casting finishes, temperature with molten steel reduces, the roll body is solidification shrinkage also, at this moment, last roll neck on the upper mold (1) plays a part roll is upwards drawn with the upwards chamfering and the plane that emit the junction, oral cavity, the effect of chamfering herein is to reduce concentrated stress, and the frustum hole face of the ingate (2a) of lower mold (2) bottom will make roll pull down, because the stress at both dynamics differences and the small-bore place of ingate (2a) is concentrated, the roll roll body is complete and descending the fracture of roll neck end face and cast gate junction, like this, disassembling attachment bolt in the hole (1a) can at first divide and lay down upper mold (1), simultaneously because roll barrel and down roll neck and lower mold (2) design of drafting angle is arranged, therefore, roll can be easily taking-up in the lower mold (2).Difficult problem when so just very easily having solved the casting mold demoulding.

Claims

1, a kind of method of producing cast steel roll, its technical process is as follows:

A: design and produce the metal mold that meets specification requirement;

B: in the cast gate groove of pouring plate that cast gate is brick flat;

D: behind the cast roll molten steel, when roll is cooled to 860 ℃～890 ℃ in metal mold, roll is pulled out carry out temper.

2, the method for production cast steel roll according to claim 1 is characterized in that: described temper comprises following process:

A: the speed of heating by 60 ℃/hour is heated to 650 ℃ ± 10 ℃ with roll;

B: insulation is 15 hours in the time of 650 ℃ ± 10 ℃, cools off with stove then.

3, the metal mold of special use in the method for the described production cast steel roll of a kind of claim 1, it is characterized in that: it is made of upper and lower casting mold, wherein upper mold (1) is inner is the upper and lower hollow body that communicates, the bottom of hollow cavity is a roll neck shape on the roll, the rising head of top for opening wide, the latus rectum at rising head place is greater than the roll neck diameter; Lower mold (2) inside is the cavity body of roll barrel and following roll neck shape, an ingate (2a) is arranged at its bottom, its latus rectum is less than the size of roller neck, this ingate (2a) communicates with pouring basin on the pouring plate (4), has on the outer wall of lower mold (2) for what lifting was used to hang (5).

4, metal mold according to claim 3 is characterized in that: between upper and lower two parts of cavity body of described upper mold (1) inside a chamfering transition that makes progress is arranged; The ingate (2a) of described lower mold (2) bottom is up-small and down-big frustum.

5, according to claim 3 or 4 described metal molds, it is characterized in that: cast gate iron pipe (3) communicates with pouring basin on the pouring plate (4), and cast gate iron pipe (3) stands on pouring plate (4) and goes up and be positioned at described metal mold side.