JPS6114036A - Manufacture of metallic formed part - Google Patents

Abstract

PURPOSE:To obtain a precise formed part with a good productivity without requiring a post-working by supplying a specified melt-forging use formed part member being a formed part material by a forming roll, and also executing continuously a melt-forging stage and a precision pressing stage. CONSTITUTION:A molten metal M is formed to a band plate-shaped formed part material M1 of a state that a worked band M1''' of a half-melted state is hung and held by a solidified band M1' and M1'' of both the right and left sides, by upper and lower rolls a1, a2 of a forming roll A. The material M1 is brought to heat insulation through a heat insulating chamber B and shifted to a forming stage C. The stage C consists of a melt-forging stage D, a primary precision pressing stage E and the second precision pressing stage F. In the stage D, a rough formed part is formed by increasing a thickness by a portion shrinked from the final formed part size, and it is completed to a prescribed formed part size by the stage E. The precision pressing stage can be executed by only one process using a pair of forming dies, but in case a high accuracy is required, it will also do that two or three pairs of forming dies raising accuracy successively are used.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing metal products.

(Conventional technology) Conventionally, molded products obtained by manufacturing methods such as casting, extrusion, drawing, rolling, and forging are molded into final finished products by performing post-processing such as cutting, pressing, and polishing. However, the subsequent processing is labor-intensive and labor-intensive, causing an increase in product costs.Particularly in the case of parts that require strict precision, there is a significant problem in that the costs are high.

In addition, the hot forging method involves injecting molten metal into a forming die that has a set of two separate dies, and solidifying the molten metal while applying pressure, cooling, and heating to the molten metal to produce a metal product, and the product material is the above-mentioned material. In this way, the molten metal was supplied to the mold.

However, since the conventional method described above involves injecting molten metal into the mold for each molding process, its workability is poor and the processing speed after injecting the molten metal is slow, and when producing thin-walled products, There was a problem in which the molten metal solidified immediately after pouring, making it impossible to pressurize it in time to improve quality and dimensional accuracy.

(Objective of the Invention) The present invention has been made in view of the conventional circumstances, and its purpose is to supply a material to a material supply method that can obtain metal products with high quality and dimensional accuracy, and to improve the melting process. A manufacturing method that improves workability by making the process continuous with the precision pressing process, promotes ultra-fine crystal structure by improving both processes, and achieves high precision of the finished product, eliminating the need for post-processing and providing precision products at low cost. The purpose is to try to obtain.

(Structure of the Invention) The method for manufacturing a metal product according to the present invention includes: - providing a product material in the form of a strip using a forming roll; the material having solidification zones at least on both sides; and a semi-molten state between the resolidification zones; The finished product for melt forging with the processed belt suspended is transferred while being kept warm, heated and heated.
Molten forging is inserted into the female die of a mold equipped with a cooling mechanism, pressurized by the male die, and cooled and heated by the cooling/heating mechanism to lower the temperature to the solidification zone and solidification range to form the first molded product. and a precision pressing step in which the first molded product is die-forged using a mold with high dimensional accuracy while applying pressure, cooling, and heating, and is characterized in that both steps are performed continuously. .

Function) The method for manufacturing a metal product of the present invention provides the product material for melt forging in a semi-molten state in the form of a strip and suspended by solidification zones formed at least on both side edges.
Continuous feed of material becomes possible, making the melt forging process continuous and faster.

In addition, in the melt forging process, by cooling, heating, and pressurizing the melt forging and manufactured product material using a forming die, the temperature is lowered to the solidification zone and solidification range where the liquid phase and solid phase coexist, thereby forming crystal grains. By forcibly advancing the ultra-fine refinement of the material, we obtain a stable crystal structure with no shrinkage cavities, improving the precision of rough-formed products, and further improving precision by applying cooling, heating, and pressure in the precision pressing process. It is used to manufacture ultra-precise products. (Embodiment) An embodiment of the present invention will be explained with reference to the drawings.
In Fig. 2, (A) shows the upper and lower two rolls (a, + >
(a 2 ) is a forming roll set.

The lower roll (al) has its roll body (
1) Cooling/heating mechanism that circulates refrigerant such as water (2)
metal rings (3) and (4) are disposed on the outer peripheral surface at both ends at intervals, and a ceramic (5) is provided between both rings (3) and (4).

Each of the above rings (3), (4), and (5) is connected to the roll body (1), respectively.
) The metal ring (3) (
4) is made to protrude from the ceramic ring (5), and the rings (3) and (4) are provided with annular grooves (3') and (4').
).

Metal rings (3) and (4) are made of heat-resistant metal (including sintered material)
use.

The ceramic ring (5) of the lower roll (al) has three metal pieces (6) (6) (6) that divide the ring in the circumferential direction.
are provided protrudingly and are integrally formed on the metal rings (3) and (4).

The upper roll (al) is rotatably disposed on the lower roll (al) at a predetermined interval, and the drawing shows a general roll structure made of metal material. It may also have the same structure as al).

The forming roll (A) has different conductivities between the metal rings (3) (4) and the metal pieces (6) (6) (6) and the ceramic ring (5), and the metal rings (3) (4) has high heat dissipation, and the ceramic ring (5) has high heat retention, so when the molten metal is passed through the forming roll (A), the ring (
3) The molten metal advances at different speeds at each contact surface between (4) and the ring (5).

In the figure, (20) is a melting furnace, and (21) is a guide path for the molten metal (M), which guides the molten metal (M) and connects both upper and lower rolls (al
) (al) to continuously form the product material (Ml).

The part of the product material (Ml) that is in contact with the metal rings (3) and (4) is strongly cooled or heated to solidify and form a solidification zone (Ml).
' + >(M' + ) and the metal piece (6)
(6) The part in contact with (6) is also solidified by strong cooling or heating adjustment, and coagulation zones (M"1) connecting the left and right coagulation zones (M' + ) (M' + ) are formed at regular intervals. The solidification rate of the part in contact with the ceramic ring (5) is slow, and the solid phase and liquid phase coexist in a semi-molten state, and the part comes into contact with the processing zone (
M″'+).

In other words, the product material (Ml) is in a semi-molten state (M″
'+) to the left and right coagulated zones (M'+) (M'+
) and a coagulation zone (M" + ) (M" + ) (Fig. 4).

The coagulation zone (M' + ) (M" + ) and the processing zone (
The solidification rate of M'''+) is set by adjusting the cooling mechanism (2) so that a predetermined solidified state or semi-molten state can be obtained.

In addition, (19) in the figure is a heater, and the product material (MI)
This prevents the water from becoming too cool.

In the figure, (B) is a heat storage, and the molded part f! The finished product material (Ml) is transferred to (C).

The heat storage (B) is made of heat insulating material assembled into a box shape, with openings on the front and rear surfaces to form an inlet (B1) and an outlet (B2), and heaters (B3) (84) located above and below the interior.
are provided respectively, and transfer rollers (Bs) (B's) are provided at predetermined intervals from the entrance (B1) to the exit (B2).
(Bs) (Bs) is arranged.

The finished product material (MI) is then transferred to the molding step (C) while being kept warm.

The forming process (C) includes a melting process (D>), a primary precision pressing process (E
) and a secondary refinement process (F).

In the melt forging process, a rough-shaped product is formed by increasing the thickness by an amount condensed from the final product size, and the first molded product is completed into a predetermined product size by a precision pressing process.

The above pressing process is one process using one set of molds.
1. .

However, if high precision is required, it is also optional to perform multiple steps using two to three sets of molds whose dimensions and precision are successively increased.

It should be noted that processing may be performed with a time interval between the melt forging process and the precision pressing process, but during that time, the metal crystals that are maintained at temperature will grow and the precision and strength of the product will deteriorate. Set the machining speed.

To explain the melt forging process (D), the forming die (d) consists of a female die (dl) and a male die (dl).
In l), the molded part is made of a geramic material to provide heat retention.

The female mold (dl) has a cooling mechanism (11) and a heating mechanism (12).
), and the arrangement of both mechanisms (11) and (12) is set according to the material and shape of the finished product.

The male mold (dl) is made of a heat-resistant metal mold such as high chromium molybdenum steel, and a cooling 11i (13) and a heating mechanism (
14).

Furthermore, a ceramic mold may be used as the male mold (dl).

The melt forging process (D) includes cooling mechanisms (11) (13) and heating mechanisms (12) for the female mold (dl) and male mold (dl).
After charging the product material (MI) into the molding part while applying appropriate cooling and heating to the molding part according to (14), the male mold (B2) is fitted, and the molten metal is cooled and pressurized by the mold. While cooling, the temperature is lowered to the solidification zone of the molten S (A), and the first molded product (M2) is formed.

For example, when the product material (Ml) is a 22% N-ZT1 alloy (melting temperature 540 to 580°C), the melting temperature is 290°C to 35°C.
The temperature is lowered to about 0° C. and a first molded product (M2) is molded.

In the primary precision pressure step (E), (e) is the mold,
The female type (el) and the male type (B2) are separated, and the secondary seminal pressure l1
The dimensions are increased by the amount of condensation in (F).

The mold (e) is a ceramic mold equipped with cooling mechanisms (11) (13) and heating mechanisms (12) (14), but may also be a heat-resistant metal mold equipped with a cooling mechanism.

In the primary pressing process (E), the first molded product (M2
．． ) is placed in a mold at a predetermined temperature, pressurized by a male mold (e2), cooling mechanism (11) (13), heating mechanism (12)
<14) Cooling and heating are applied to lower the temperature to a predetermined temperature, and a second molded product (M3) is molded.

The molding temperature of the first molded product (M2) in the above mold is 240°C to 450°C in the case of the 22% M-Zn alloy.
The first molded product (M2) is held at the temperature when the mold (e) is ejected, and after being heated to the temperature by the heating mechanism, it is placed into the mold (f).

The molding temperature of the mold (e) is 100°C to 300°C.

In the secondary precision pressure processing (F), the forming die (f) is a female die (f
+) and a male mold (r2), it is a heat-resistant metal mold that is formed to the final finished size and equipped with cooling mechanisms (11) and (13).

In addition, the molding temperature of the second molded product (M3)' molded from the mold (e) was 80% in the case of the 22% M-ZT+ alloy.
°C to 260 °C, and the second molded product (M3) was molded @
Make the final molded product (M4).

In addition, in the example, the end pressure process is primary (E).

As explained in the two steps of the secondary (F), if extremely high product accuracy is not required, the secondary step (F) can be omitted and the finished product (M4) can be completed by the primary precision pressure step (E). is also free.

Although the material for the product is not particularly limited, it is preferable that the main material is a superplastic metal such as zinc (Zn),
O~6Bwt%N, O~5wt%SL.

O~10wt%侃, 0~5wt%-1O~5wt%Mn
, O~3wt%Fe, 0~3wt%Ti, -0~5wt
%NL, O~3Wj%Cr, O~3wt%Pb, O~1
Qwt%Sn, O~I CLvt%Be, O~5w
t%p, 6~4Qwt%C, O~5wt%W, O~3w
A Zη-based alloy consisting of t%B is exemplified, and the main material is aluminum l), O~20wt%SL, 0~20wt
%Ctt, O~10wt%~, 0~2Qwt%Zn,
'C) ~12Wj%1yln, Q ~5wt%F
e, 0-3wt%Ti, O-5wt%NL, 0-5wt
%Cr, 0~3wt%Pb, O~3wt%3n, O~
10wt%C9-〇~5wt%Be, O~3wt%W,
O-'3wt%~.

M-based alloy consisting of O~5wt%B or copper (侃) as the main material, 0~2Qwt%Si, O~2Qwt%#,
O~5wt%-, 0~30wt%Zn.

0~20wt%Mn, O~3wt%Fe, O~5wt%
Ti, O~10wt%N, 0~10
wt%Cr, O~5wt%Pc+, O~5wt%Sn
, O~20wt% C1O~5wt%3e, O~10wt
%W, O ~ 5wt% B, 0 ~ 5wt% iron, furthermore, iron (Fe) is the main material, O ~ 40wt%
%C, O~5 wt%1yln, Q'~5wt%si,
O~10wt%Cr.

0~20wt%NL, O~5wt%Mo,
0-3wt% ■.

O~5wt%P, O~2wt%S, O~3wt%h.

0~10wt%Sn, 0~10wt%Be, '0~3w
t%Aa, O~24wt% (a, O~20wt%W
, Fe-based alloy consisting of 0 to 5 wt% B, etc.

(Effects) As described above, the present invention provides a product material in the form of a strip using a forming roll, and the material has coagulation zones on at least both side edges, and a semi-molten processing zone is suspended between the re-solidification zones. Since the melt-forged finished product member is transferred while being kept warm, the finished product material for melt-forging is delivered in a semi-molten state that is in the form of a strip and is suspended by solidification zones formed on at least both side edges. , it is possible to continuously feed the material, making the melt forging process continuous and faster, improving workability, and since the processing zone is in a semi-molten state, the molten metal can be directly injected into the melt forging mold. The machining speed is faster than in the conventional case, and the working process time can be shortened, making it possible to further speed up the work.

In addition, since the product material is supplied in a semi-molten state to the melt-forging process while being kept warm, it eliminates the conventional problem when forming thin products, namely, the thin part solidifies immediately after pouring the molten metal and pressure is not applied. It is possible to solve the problem of not being able to complete the work in time, and to carry out melt forging while applying a predetermined pressure.Therefore, it is possible to obtain ultra-fine crystals in the finished product, to stabilize the quality, and to improve the dimensional accuracy.

Further, the product member for melt forging is inserted into the female die of a forming die equipped with a cooling/heating mechanism, pressurized by the male die, and cooled/heated.
A melt forging process in which the first molded product is formed by lowering the temperature to a solidification zone and solidification range while applying cooling and heating using a heating mechanism;
A metal product comprising a precision pressing process in which the first molded product is die-forged using a mold with high dimensional accuracy while applying pressure and cooling/heating, and both processes are performed continuously. Since the manufacturing method is configured, the first molded product is forcibly degassed and ultra-fine crystal grains are promoted, so that the first molded product is free from defects such as shrinkage cavities and has a stable crystal structure. The quality and dimensional accuracy of the molded product can be improved, and since the first molded product is then die-forged while being further pressurized and cooled in the precision pressing process, precision parts etc. with significantly higher dimensional accuracy than conventional methods can be produced. metal products can be formed.

Therefore, it eliminates the need for post-processing, which is a finishing process as in conventional methods, and also reduces the raw material supply process.

Since the melt forging process, the process and the pressing process are performed continuously, the workability is improved and the productivity can be improved.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the embodiment of the present invention, Fig. 2 is a partially cutaway plan view of the same, Fig. 3 is a partially cutaway side view of the lower roll, and Fig. 4 is a partially cutaway side view of the lower roll. It is a three-dimensional view of the molded material. In the figure, (A)...forming roll (al)...upper roll (a
2)...Lower roll (B)...Heat storage (C)...
・Forming process (D)... Melting forging process (E)...1
Next pressure process (F)...Second pressure process culm (M)...Molten metal (Ml)...Product material (M
' + ) (M" 1)...Coagulation zone (M"'+)・
...It is a processing band. fart

Claims (1)

[Claims] A finished product material is provided in a band shape by a forming roll, and a finished product member for melt forging in which the material has coagulation zones on at least both side edges and a semi-molten processing zone is suspended between both coagulation zones is heated. It is transferred, inserted into the female mold of a mold equipped with a cooling/heating mechanism, pressurized by the male mold, and cooled/heated by the cooling/heating mechanism.
A melt forging process in which the temperature is lowered to a solidification zone and a solidification range while applying heat to form a first molded product, and the first molded product is molded using a mold with high dimensional accuracy while applying pressure, cooling, and heating. A method for manufacturing metal products, which consists of a precision pressing process for forging, and is characterized in that both processes are performed consecutively.