CN1036179C

CN1036179C - Method of production of cast steel roller and its special casting metal mould

Info

Publication number: CN1036179C
Application number: CN93115118A
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: 1997-10-22
Anticipated expiration: 2013-12-03
Also published as: CN1087562A

Abstract

The present invention relates to a method for producing cast steel rollers in a casting forming technique and a special metal casting mould thereof. The method for producing cast steel rollers mainly comprises: casting mold design, flat plate preparation casting and cooling, and direct tempering treatment. The metal casting mould mainly comprises an upper casting mould and a lower casting mould, wherein the interior of the upper casting mould is provided with an upper cavity body and a lower cavity body which are communicated with each other, the interior of the lower casting mould is also provided with a cavity body, and the interior of the upper casting mould and the lower casting mould matched with each other presents a roller shape. The special metal casting mould has the advantages of reasonable specific structure design and convenient demoulding for rollers. The present invention can be widely used for manufacturing cast steel rollers.

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 casting 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 casting 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.

For achieving the above object, the present invention is by the following technical solutions: a kind of method of producing cast steel roll is characterized in that:

A., the metal mold of a casting cast steel roll is provided;

B. in the cast gate groove of a pouring plate, build flat gate brick;

C. uprightly be arranged on above-mentioned metal mold and a cast gate on the above-mentioned pouring plate in order;

D. pour into a mould the roll molten steel;

E. when roll is cooled to 860 °～890 ℃ in metal mold, roll to be pulled out carry out temper, temperature is 650 ℃ ± 10 ℃, and tempering time is 15 hours, and roll cools off with stove afterwards.

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, appetite case, also need not the preceding miscellaneous programs of numerous cast such as into baking room oven dry, when roll is cooled to 860 ℃～890 ℃ in metal mold, can pull out and carry out temper, again do not need sand removal and cutting to water to enter behind the stomach heat-treatment furnace to 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 of the cast steel roll among the present invention a---time plot.

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

The structure configuration schematic diagram of Fig. 2 has given the source metal mold and pouring plate.

As seen from Figure 2, metal mold comprises upper and lower casting mold two parts, wherein upper mold (1) is vertical two halves split-type structural, two branch halfbodies are the upper and lower hollow body that communicates by the hole shown in Fig. 2 (1a) with merging formation one inside after the Bolt Connection, the bottom of hollow body is a roll neck shape on the roll, its top is the rising head of straight-through open type, has a chamfering transition that makes progress to connect between the two, or is similar to the version transition of chamfering.Both pass through its identical mutually concave, convex platform pivot bush unit in end separately upper mold (1) and lower mold (2), and 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 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, the last roll neck of 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 following roll neck and lower mold (2) have the design of drafting angle, therefore, roll can take out in lower mold (2) easily.Difficult problem when so just very easily having solved the casting mold demoulding.

Claims

1. method of producing cast steel roll is characterized in that:

A., the metal mold of a casting cast steel roll is provided;

B. in the cast gate groove of a pouring plate, build flat gate brick;

D. pour into a mould the roll molten steel;

2. special-purpose metal mold in the method for the described production cast steel roll of claim 1, it is characterized in that: metal mold 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, one ingate (2a) is arranged at its bottom, its latus rectum is less than the size of roller neck, and 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).

3. metal mold according to claim 2 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.