JPH0637679B2 - Pressing method for briquette of metal scrap - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressure molding method for briquette of metal scraps, and more specifically, to metal scraps such as bulky pig-dalai powder generated by cutting of a casting. The present invention relates to a pressure forming means for forming a briquette that can be melted and reused as a raw material for casting by pressure forming using a multi-stage pressure system under multi-stage supply.

[Conventional technology]

If metal scraps such as pig dalai powder generated by cutting of cast iron are reused as they are as a raw material for casting, they cause pollution problems due to contamination due to cutting oil and machine oil attached during melting. In addition, since the pig-dalai powder is bulky and difficult to compress, if it is simply pressed and solidified, it will break up in the melting furnace and generate dust, which causes secondary pollution. In order to solve such a problem, the present applicant previously disclosed in Japanese Patent Publication No. 58-15238, Japanese Patent Publication No. 58-14493, and Japanese Utility Model Publication No. 56-40837 that the metal scrap pressure that can be reused as a raw material for casting. A pressure molding means for a lump (briquette) is proposed.

A conventional example of a pressure forming device for a metal scrap briquette will be described with reference to FIGS. 2 to 5. The pressure molding device (1) for a metal scrap briquette basically comprises a lower punch (8) projecting from the center of a lower frame (7) and a lower punch (8).
And a cylindrical mold (9) arranged above the lower punch (8) so as to be movable up and down, and an inverted truncated cone hopper integrally fixed to the upper part of the mold (9). (14) and an upper punch (17) penetrating through the hopper (14) and the die (9) and arranged coaxially with the lower punch (8) to move up and down. After being kneaded and stirred with the binder, metal scraps, such as pig dalley powder and iron powder (A), which are conveyed above the pressure molding device (1) by the bucket (3) pass through the chute (4). It is supplied to the feeder (5), further fed to the press section (6) and pressure-formed to form a cylindrical briquette (A '). More specifically, as shown in FIGS. 2 and 3, the pressing part (6) has a lower punch (8) for pressing projectingly provided in the central part of the lower frame (7).
A cylindrical mold (9) is arranged above the lower punch (8). The mold (9) is supported by a cylinder device (10) installed in the lower frame (7) so as to be vertically movable. That is, the piston rod (1
A connecting member (12) is fixed to 1), and two supporting rods (13) and (13 ') penetrating the lower frame (7) through the connecting member (12).
And the cylindrical mold (9) is fixed to the upper ends of the support rods (13) and (13 '). When the piston rod (11) of the cylinder device (10) moves up and down, the connecting member (12) and the support rod
(13) The cylindrical mold (9) supported by (13 ') moves up and down with respect to the lower punch (8). In the upper part of the mold (9), a hopper (14) having an inverted truncated cone shape is supplied into the mold (9) while guiding the metal scraps mixed with the binder, for example, the pig-dalai powder (A). Are attached together. (15) is an upper cylinder device attached to the upper frame (16). An upper punch (17) fixed to the lower end of the piston rod of the upper cylinder device (15) has a hopper (14) and a mold (9). The kneaded product of the pig dalley powder (A) and the binder sent into the mold (9) is compressed between the lower punch (8) and solidified. Pressing surface of lower punch (8) and upper punch (17)
Each of (8a) and (17a) is formed in an arcuate concave surface so that the pressing load concentrates from the peripheral portion to the central portion of the metal scrap (A) during compression so that the metal scrap briquette (A '). In addition to increasing the strength of, the inter-particle gap of the pig dallai powder and iron powder is reduced. (18) is a pay-out cylinder device laterally arranged on the upper side of the lower frame (7), which is a discharge chute in which the metal scrap briquette (A ') after pressure molding is provided on the side of the mold (9). (19) It is to be sent up. The metal scrap (A) is fed into the hopper (14) by a feeder (5) which is oscillatably suspended and supported on the upper portion thereof, and the tip portion of the feeder (5) is as shown in FIG. It is bifurcated and holds the upper punch (17). The feeder (5) is activated by activating a vibrator (20) provided below the metal scrap (A) when the scrap (A) is supplied.
Vibration is transmitted to the kneaded material of the metal scrap (A) and the binder supplied above to positively feed the metal scrap (A) and the hopper (1
4) Supply the same amount from both sides of the upper punch (17) by gravity drop method. By this, the hopper (14) and the mold (9)
The metal scrap (A) is prevented from being slanted and accumulated in only one direction inside, and a compressive load is applied to the kneading raw material of the metal scrap (A) and the binder during pressure molding in the mold (9). Act evenly, and the density of the obtained briquette (A ') becomes substantially uniform. The kneading raw material of the metal scraps (A) and the binder is placed above the pressure molding device (1) in a bucket (3) which is moved up and down through a wire (22) by a hoist (21) as shown in FIG. And is supplied from above into the hopper (14) by a predetermined amount through the chute (4) and the gate (24). The amount of metal scraps (A) supplied at one time is made equal to the weight of one metal scrap briquette (A ') by adjusting the opening area and opening time of the gate (24). Reference numeral (25) is an auxiliary hopper provided above the feeder (5) separately from the chute (4) and stores metal scraps and additives other than the metal scrap (A) supplied from the bucket (3). When necessary, the gate (26) of the auxiliary hopper (25) is opened to send additives and the like onto the feeder (5) and mixed with the metal scrap (A) to mix them with the hopper (14) and the mold (9). Supply in.

The metal scraps, for example, the pig iron powder (A), are sifted prior to being stored in the bucket (3), impurities and heavy metals are removed by magnetic sorting, and a suitable amount of the mixture is used by using a kneading device such as a mixer. The raw material for forming briquettes (A ') is prepared by stirring and kneading with a binder.

The operation sequence of the conventional pressure molding apparatus will be described below with reference to FIG. By operating the lower cylinder device (10) to shorten the feeding stroke of the piston rod (11), the mold (9) and the hopper (14) are lowered to lower the lower part of the mold (9) to the lower punch (8). Block with. After that, the gate (24) of the chute (4) is opened, the metal scrap (A) is supplied onto the feeder (5) and the vibrator (20) is activated to positively feed the metal scrap (A). An equal amount is supplied from both sides into the hopper (14) and the mold (9) (Fig. 6I). When metal scraps (A) equivalent to one briquette (A ') are supplied into the hopper (14) and the mold (9), the gate (24) is closed and the vibrator (20) is stopped. The supply operation of the metal scrap (A) from the feeder (5) is temporarily stopped. In this state, the upper cylinder device (15) is activated, the upper punch (17) is extended and lowered, and the metal scrap (A) of the die (9) is compressed and solidified (sixth).
(Figure II). As shown in FIG. 6 III, when the compression solidification of the metal scrap (A) is completed, the piston rod (11) of the lower cylinder device (10) is extended, and the die (9) and the hopper (14) are extended.
(Fig. 6 IV), the upper punch (17) is further raised, the briquette (A ') of metal scraps placed on the lower punch (8) is discharged, and the cylinder device (18) is started. It is sent out onto the carry-out chute (19) through (Fig. 6 V). After that, the mold (9) and the hopper (14) are lowered to move the mold (9).
The lower part of the lower punch is closed by the upper end of the lower punch (8), and in this state, the gate (24) of the chute (4) is opened, the vibrator (20) is activated, and the die ( 9) Metal scraps inside
The supply of (A) is restarted (Fig. 6, VI).

On the other hand, the briquette (A ') of metal scraps sent out onto the discharge chute (19) is sent into a sintering furnace (not shown) by using an appropriate transfer means, and is hardened in a high temperature heating atmosphere. It is sintered and hardened by utilizing the endothermic reaction of the agent. The oil adhering to the briquette (A ') is removed by combustion to produce a briquette of metal scrap that can be reused as a casting raw material.

[Problems to be Solved by the Invention]

As can be understood from the above description, in the conventional pressure molding apparatus, the metal scrap (A) corresponding to one briquette (A ') and the adhesive are kneaded in the mold (9). Briquettes (A ') were formed by collectively filling the material, pressurizing it using the descending stroke of the upper punch (17), and compressing and solidifying it.

By the way, as a result of the recent use of NC lathes and machining centers in the cutting of cast products, the thickness of pig dough powder generated in the cutting process becomes thinner and the bulkiness increases in proportion to the improvement of cutting accuracy. Has come. When the kneading raw material of such a bulky pig-dalley powder (A) and the pressure-sensitive adhesive is filled in the same mold (9) and pressure-molded, the weight per briquette, which is 6 to 7 kg in the past, is 5 kg or less. However, in order to obtain a briquette having the same weight, it is necessary to change the volume of the mold, the cross-sectional area of the upper and lower punches, and the stroke, and there is a drawback that a large design change is required.

[Means for Solving the Problems]

As a means for solving the above problems, the present invention provides a lower punch protruding from the center of a lower frame of a pressure molding apparatus main body, and a cylinder provided above the lower punch and vertically movable with respect to the lower punch. -Shaped die, an inverted frustoconical hopper integrally fixed to the upper part of the die, and an upper punch that penetrates the hopper and the die and moves up and down coaxially with the lower punch. When the kneading raw material of the metal scraps and the binder is supplied to the pressure molding device for the metal scrap briquettes and pressure-molded in the mold, the mold and the hopper are lowered. Then, the lower part of the mold is closed by the lower punch, and a part of the kneading raw material of the pig dalley powder corresponding to one briquette supplied to the hopper and the binder is filled in the mold, and the upper punch is punched. And the kneading raw material filled in the mold is compressed and solidified. The upper punch, the remaining part of the kneading raw material stored in the hopper is additionally filled into the mold from between the upper part of the mold and the hopper, and the upper punch is lowered again to perform the additional filling. It is intended to provide a method for pressure-forming a briquette of metal scraps, which comprises integrally pressure-forming a kneading raw material and a kneading raw material that has been previously filled and pressurized in a mold.

[Action]

When introducing a kneading raw material of bulky pig dala powder and a binder into a mold to form a briquette of metal scraps by pressure molding,
A part of the kneading raw material corresponding to one briquette is filled in the mold and compression-twisted. Further, the remaining part of the kneading raw material is additionally filled from the hopper into the mold, and the kneading raw material thus additionally filled Simultaneously pressurizing the kneading raw material that has been previously filled and pressurized in the mold to manufacture a briquette having a predetermined weight with the conventional pressure molding apparatus.

〔Example〕

FIG. 1 is a schematic vertical sectional view of a pressure molding apparatus for explaining a specific example of the method of the present invention. In the following description, the same components as those in FIG. 6 for explaining the conventional method are denoted by the same reference numerals and reference symbols, and the description of the overlapping matters will be omitted.

(I) After closing the lower part of the die (9) with the lower punch (8) by lowering the die (9) and the hopper (14), before starting the descending stroke of the upper punch (17). From the popper (14), the kneading raw material of the pig dalley powder (A) and the binder corresponding to about half of the briquette (A ″) is filled into the mold (9).

(II) When the mold (9) is filled with a predetermined amount of the kneading raw material, the upper punch (17) is started, and the descending stroke is used to make the pig dough powder (A) in the mold (9). Is compressed and solidified into a metal scrap briquette (A '). This completes the first press-molding operation.

(III) The upper punch (17) is raised to form a self-weight falling path of the kneading raw material between the upper part of the die (9) and the hopper (14). The balance of the kneading raw material stored in the hopper (14) is
As the upper punch (17) rises, the die (9) is additionally filled.

(IV) The upper punch (17) is restarted, and its descending stroke is used to compress and solidify the pig dough powder (A) in the die (9). This completes the second press-molding operation.

(V) A metal scrap briquette (A ') is pressure-molded from a kneading raw material of the pig dallai powder (A) and the binder introduced into the mold (9), and then the mold (9) and the hopper (14) ), The feeder (5) is placed in the hopper (14) that has already been emptied.
From the kneading raw material (A ″), a kneading raw material of the pig dalai powder (A) and the binder, which corresponds to approximately one briquette, is sent out.

(VI) The rising stroke is transmitted to the mold (9) and the hopper (14).

(VII) Transfer the rising stroke to the upper punch (17),
The pressed state of the metal scrap briquette (A ″) by the upper punch (17) is released. After this, the metal scrap briquette (A ″) placed on the lower punch (8) is dispensed to the cylinder device (18). Send it onto the discharge chute (19) via the activation of.

(VIII) The mold (9) and the hopper (14) are lowered, the lower part of the mold (9) is closed by the upper end of the lower punch (8), and then it is fed into the hopper (14). The kneading raw material of the metal scraps (A ″) and the binder is put into the mold (9) in an amount corresponding to approximately half of the metal scrap briquettes (A ″). After that, the pressure molding operation using both multi-stage pressurization and multi-stage filling is repeated according to the operation sequence shown in FIGS. 1 (I) to (VIII). As a result, even bulky pig dalley powder can be briquetteed under pressure molding conditions with high productivity.

〔The invention's effect〕

By adopting the method of the present invention, it becomes possible to make bulky pig-dalai powder briquette, which has been found to be difficult to compress and solidify, with the conventional apparatus, and the remarkable effect of promoting resource saving is exhibited. . Further, while the pressure forming load is being transmitted to the kneading raw material in the mold, the kneading raw material of the metal scrap and the binder to be next pressure formed in the hopper (14) is charged simultaneously. By adopting a different raw material supply method, it becomes possible to reverse the briquette forming operation in a short cycle time, even though the multi-step processing method is adopted.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal sectional view of a pressure molding apparatus for explaining a specific example of the method of the present invention, FIG. 2 is a side view of a press section of the pressure molding apparatus, and FIG. 3 is a front view thereof. 4 is a side view showing the entire structure of the pressure molding apparatus, FIG. 5 is a top view showing the shape of the tip of the feeder, and FIG. 6 is a schematic view of the pressure molding apparatus for explaining the conventional pressure molding method. FIG. (17) …… Upper punch, (8) …… Lower punch, (9) …… Mold, (14) …… Hopper, (A) …… Metal scraps, (A ′) …… Metal scrap briquettes , (A ″) …… Metal scraps.

Claims (1)

[Claims] 1. A lower punch protruding from the center of a lower frame of a main body of a pressure molding apparatus, and a cylindrical mold provided above the lower punch and vertically movable with respect to the lower punch. ,
A metal scrap briquette including an inverted-mounting conical hopper integrally fixed to the upper part of the mold and an upper punch that passes through the hopper and the mold and moves up and down coaxially with the lower punch. When a kneading raw material of metal scraps and a binder is supplied to a pressure molding device and pressure molding is performed in the mold to manufacture a briquette of metal scraps, the mold and hopper are lowered to move the mold. The lower part of the kneader is closed by the lower punch, a part of the kneading raw material of the pig dallai powder and the binder, which is equivalent to one briquette supplied to the hopper, is filled in the mold, and the upper punch is moved down to The kneading material filled in the mold is compressed and solidified, the upper punch is raised, and the remaining part of the kneading material stored in the hopper is additionally charged into the mold from between the upper part of the mold and the hopper. Then, lower the upper punch again, and fill the kneading raw material with the additional filling first. A method for press-molding a briquette of metal scraps, which comprises integrally press-pressing a kneaded raw material under pressure in a mold.