JPS6221043B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to powder metallurgy, and more particularly to a method and apparatus for manufacturing products from ferromagnetic powder materials.

BACKGROUND OF THE INVENTION The following problems regarding homogeneous texture and homogeneous phenomena in the properties of materials for manufacturing products from non-uniform powder materials have not yet been adequately solved.

Techniques for manufacturing products from metal powder, including mixing to equalize the particle size distribution of the powder, filling the powder into a container, sealing the container, heating and compressing the container It is publicly known.

Mixing the powders provides a relatively uniform distribution of both large and small particles. Although this method makes the material structure of the product relatively uniform, there are still some problems. Particularly fluffy powder has low thermal conductivity, and sintering it requires a slightly longer heating time. Furthermore, this method does not allow effective use of the internal space of the container.

In addition, it is a method of making products from iron magnetic powder, including mixing to make the particle size distribution of the powder uniform, filling the powder into a container, vibration compression of the powder, and bringing the powder to the sintering temperature. Techniques involving heating the container, sealing the container, and compressing the container are well known.

The above-mentioned method has been put to practical use in an apparatus having a mixing tank provided with a weir in the discharge section. The mixing vessel is drum-shaped and made of structural steel, which is a magnetic material. There is a vibrator under the weir mentioned above.
This vibrator has a flat base that supports the container.
The device also has a heater and a drawing press for the container.

A clear advantage of the method and apparatus described above is that it reduces the heating time extension in the sintering step. However, when filling the container, especially when vibratory compaction is performed, partial separation of the powder occurs. This ultimately causes non-uniformity in the material structure and properties of the product, which significantly reduces the mechanical properties of the product.

DISCLOSURE OF THE INVENTION The present invention has been made with the intention of providing a method of an apparatus for manufacturing a product from ferromagnetic powder material, and the manufacturing and organizational characteristics thereof are such that the powder is filled into the container. and prevents partial separation of the powder during vibratory compaction, thereby imparting properties that improve the mechanical properties of the product.

In order to achieve the above object of the present invention, there is provided a method for manufacturing a product from ferromagnetic powder, which comprises mixing the above powder to average the particle size distribution, and filling the mixture into a container.
In a method that includes vibratory compaction of the powder, heating the container until the powder reaches a sintering temperature, sealing the container, and compressing, the powder with an average particle size is compressed before filling the container. magnetized.
During the magnetization process, the small particles of the powder are agglomerated together with the large particles. The same magnetic effect is maintained even when the agglomerated material is filled into the container and subjected to vibration compression. As a result of this effect,
Said partial separation of said powder is prevented and conditions for homogeneous texture of the product material are guaranteed.

When magnetizing the above powder, the strength range is 1×10 ³
0.1 to 0.5 under the action of a fixed magnetic field of 2×10 ⁴ A/m
Preferably, it is exposed for a minute. Such conditions are the most economical and clearly improve the quality of the material for the product.

Further, the above object of the present invention is to provide an apparatus for manufacturing products from ferromagnetic materials, including a mixing tank provided with a weir in the discharge part;
a vibration exciter provided below the discharge part of the mixing tank, including a stand that supports the container; and a container heater;
This can also be achieved by providing a press device, providing an electromagnet adjacent to the mixing tank, and making the mixing tank and its weir from a non-magnetic material.

The device described above magnetizes the powder in the mixing tank without directly contacting the electromagnet. The filling of the container is not disturbed after magnetization. This is because the mixing tank and weir are made of non-magnetic materials.

Preferably, the electromagnet is placed below the mixing tank. In this case, the weir between the electromagnet and the powder is the smallest and the energy consumption when magnetizing the powder is correspondingly the smallest.

It is necessary to provide a device at the charging end and the discharge end of the mixing tank to bring the electromagnet closer to or away from it. Such an arrangement brings the electromagnet into contact with the mixing tank to maximize the magnetization effect.

In an improved device, the electromagnetic perspective device can be configured like a vertical guide device, which is mounted with a carrier supporting the electromagnet and coupled to a reciprocating drive.

The electromagnetic perspective device can also be configured as a rotating horizontal arm, at the end of which the electromagnet is held.

[Brief explanation of the drawing]

Fig. 1 is a side view of a device for making products from ferromagnetic powder, showing a mixing tank, a press device in partial cross section, an electromagnetic perspective device, a support stand, and a heater in vertical cross section; The figure is an enlarged side view of an improved device for vertically moving an electromagnet, showing a mixing tank, the electromagnet perspective device, and a support stand in a vertical section in a partial cross section. FIG. 4 is a side view of a device in which the electromagnetic perspective device has been improved to have a structure similar to a carrier.

DESCRIPTION OF THE PREFERRED EMBODIMENTS For carrying out the invention of the method, an apparatus is used which has a mixing tank 1 in the form of a drum and connected to a rotary drive 2 (see FIG. 1). This mixing tank 1 has a preparation section 3 and a discharge section 4. This discharge part 4 is a weir 5
Below this weir, there is a vibrator 6 having a support 7 for a container 8. This mixing tank 1 and the weir 5 of this tank
is made of non-magnetic material (e.g. stainless steel). The container 8 is made of structural steel.

The heater 9 and press device 10 for the container 8 are arranged adjacent to the container support 7 according to the process flow.

The device has an electromagnet 11 arranged adjacent to the mixing tank 1. This electromagnet is connected to the mixing tank 1 above.
It can also be attached to the side, above, or below.

In a preferred embodiment of the invention described below, an electromagnet is disposed below the mixing tank 1. In this case (irrespective of the powder in the mixing tank 1), the powder and the electromagnet, except for the wall of the mixing tank,
They are brought as close as possible to each other and the consumption of this powder during the powder magnetization is correspondingly low.

The electromagnet 11 can be directly held in the mixing tank 1 (illustration of this improvement is omitted). However, a more preferred device is one that includes a device for moving the electromagnet 11 closer and closer. This eliminates the adverse effects of vibration due to contact and the power line to the coil of the electromagnet 11, and is convenient for charging and discharging the tank 1. FIGS. 2, 3, and 4 show a device modified to include an electromagnetic perspective device.

FIG. 2 shows an improved device in which the device 12 for moving the electromagnet 11 closer and closer consists of a vertical guide device 13, to which the electromagnet 11
A carrier 14 supporting 1 is mounted. This carrier 14 is coupled to a reciprocating drive.

FIG. 3 shows an improved device in which the device 12 for moving the electromagnet 11 closer and closer is constructed as a column 16 with a rotating horizontal arm 17, the electromagnet 11 being mounted at the end of the column 16. Retained.

FIG. 4 shows an improved device in which the device for moving the electromagnet 11 closer and closer is a horizontal guide device 18.
This guide device 18 is configured as shown in FIG.
9 is attached to support the electromagnet 11. This carrier 19 is connected to a reciprocating drive.

The method of making the product from ferromagnetic powder material is carried out as follows.

Ferromagnetic powder materials (for example, steel powder for tools) can be sieved to obtain powder with a particle size of 800 μm or more. Powder having a particle size of less than 800 .mu.m is introduced into a mixing tank 1 through a charging section 3 (FIG. 1), which is rotated in order to equalize the particle size distribution of the entire amount of powder. The powder with an averaged particle size distribution is magnetized by being placed in a fixed magnetic field with an intensity ranging from 1×10 ³ to 2×10 ⁴ A/m for a time interval of 0.1 to 0.5 minutes. To this end, the electromagnet 11 is used, and this electromagnet 11 is brought close to the mixing tank 1 by means of an electromagnetic perspective device 12 (see FIGS. 2, 3, and 4).

Next, the magnetized powder is passed through the discharge port 4 of the mixing tank 1.
(see FIG. 1) and is poured into a container 8 supported on a support 7 of a shaker 6. The magnetized powder poured into the container 8 has a vibration output frequency of 50Hz,
It is compressed by vibration with a width of 0.5mm.

The container 8 filled with this compressed powder is heated by a heater 9 to the sintering temperature of this powder. Deaeration work is carried out at the same time as this heating work,
The powder container is then sealed.

The container 8 containing the sintered powder is then drawn out by a press 10 to form a bar of predetermined dimensions.

This sintered and compacted powder (product) is removed from the deformed container.

This product is subjected to the above treatment after preheating treatment (hardening, tempering), and after this treatment, the bending strength,
It is subjected to structural analysis, physical tests, and chemical tests to determine Rockwell hardness and impact strength.

For bending strength test, the above product is 6×6×50
mm heat treated (hardened, 3-step tempering) rod-shaped specimens are machined. This rod-shaped specimen is bent using a special device. The device consists of two supports spaced apart by 40 mm and a punch arranged between the supports and connected to a hydraulic press. The ends of the support and the punch have a rounded shape, the rounded end of the support being made with a radius of 15 mm and the rounded end of the punch with a radius of 7.5 mm.

The specimen is bent by the punch on the support until it ruptures. The moving speed of this punch is 0.1 mm/sec. The bending strength of this test piece at the time of failure is read by the dial of the press device.

This bending strength is determined by the formula σ bending = Mu/W = 3Pl/bh ² , where Mu is the bending motion, the unit is Kg・mm, W is bh ² /b is the bending resistance per mm ³ , and P is the above test. Bending force applied to the piece during fracture, unit: Kg l: Spacing between supports, unit: mm b: Width of the above specimen after fracture, unit: mm h: Height of the above specimen after fracture , the unit is mm.

In order to test the impact strength of this material, the product is machined into heat-treated (hardening, three-stage tempering) bar specimens measuring 10 x 10 x 15 mm.

The specimen is subjected to a pendulum impact tester with an impact force of 30 mgm. This pendulum strikes the test piece until it fractures, and after fracture, the area of the fracture surface is measured, whereas the impact force at the time of fracture is measured with the dial.

The above impact strength is determined by the formula a=A/FKg/ ^cm2 , where A is the impact force of the pendulum when the above test piece is broken, and the unit is Kgm. The area is measured in ^cm2 .

Hereinafter, specific examples of the present invention will be described.

Example 1 The above product is made from tool steel powder according to the present invention, and its composition in weight percent is carbon 1.3, silicon 0.4, magnesium 0.4, vanadium 0.4, cobalt 10.0,
Sulfur is 0.03, phosphorus is 0.03, and the remaining amount is iron. In accordance with this result, powder grains with a particle size exceeding 800 μm were removed by sieving. The powder particles having a particle size of 800 μm or less were mixed in the above mixing tank for 30 minutes in order to make the particle size distribution uniform. This powder with an averaged particle size distribution was magnetized by being exposed to the action of a fixed magnetic field with an intensity of 1×10 ⁴ A/m. This magnetization operation continued for 0.25 minutes.
The magnetized powder was poured into a container made of structural steel with 0.2% carbon. The container is 300mm in diameter.
It has a cylindrical shape with a depth of 600mm. The powder in the container was densified by vibrating the container at a frequency of 50 Hz and a width of 0.5 mm. After 3 minutes of the vibration compression operation, the vibration of the powder was stopped, and the open end of the container was closed by welding a lid with a connecting member.
This connecting member was connected to a vacuum pump to create a vacuum of 10 ⁻² mm of mercury inside the container. At the same time, this container was heated to 1150°C, maintained at this temperature for 3 hours, and degassed.

After the degassing operation was completed, the connecting member of the container was closed and the closed part was sealed. The container containing the above powder and heated to the above temperature was drawn into a cylindrical rod with a diameter of 100 mm.

The powdered metal (product) for the rod-shaped test piece acts as a core, and the deformed container acts as an outer shell. The rod-shaped specimen thus prepared was tempered at 850°C for 4 hours, cooled to 500°C at a rate of 20°C/min, and then air-cooled to room temperature. The shell was removed from the core by turning the lathe.

After preheating treatment (hardening and tempering), the products produced as described above were subjected to textural analysis, physical testing and mechanical testing to determine flexural strength, Rockwell hardness and impact strength.

The test results are as follows.

Bending strength Kg/mm ² ……260 Rockwell hardness C ……69 Impact strength Kgm/cm ² …………1.8 Products made from non-magnetized powder with the same composition can also be made using the above method. Ta.

Comparing the mechanical properties of the above products, the unit strength is
It was found that the impact strength increased by 20-25% and up to 30%. Structural analysis revealed that the product made according to the present invention had a more uniform grain structure.

Example 2 The product has a composition by weight of 1.2 carbon, 4.2 chromium,
It was made according to the invention using tool steel powder of 0.4 nickel, 0.4 manganese, 0.4 silicon, 12.0 tungsten, 3.0 molybdenum, 2.2 vanadium, 8.2 cobalt, 0.03 sulfur, 0.03 phosphorus, balance iron. In accordance with this result, powder particles having a particle size of 800 μm or less were mixed in the above mixing tank for 30 minutes to make the particle size distribution uniform. The above powder with an averaged particle size has a strength of 1×
It was magnetized by exposure to a fixed field of 10 ⁴ A/m. This magnetization operation continued for 0.25 minutes. The magnetized powder was poured into a container made of structural steel with 0.2% carbon. The container is cylindrical with a diameter of 300 mm and a depth of 600 mm. The magnetized powder in this container is
This container was densified by vibration at a frequency of 50 Hz and a width of 0.5 mm. The vibratory compaction of the powder was stopped after 3 minutes and the open end of the container was closed by welding a lid with tubing fittings. This pipe fitting is connected to a vacuum pump to pump the inside of the container into a column of mercury.
A vacuum of 10 ^-2 mm was applied. At the same time, this container
It was heated to 1150°C and held at this temperature for 3 hours to effect sintering and degassing.

After degassing was completed, the vessel was sealed by closing the tubing fitting and sealing the closed part. The container containing the powder and heated to the temperature was drawn into a cylindrical rod with a diameter of 100 mm.

The above powder metal (product) for the above rod is as a core,
The deformed container also acts as an outer shell.
After the above prepared bar was annealed at 850℃ for 4 hours
It was cooled to 500°C at a rate of 20°C/min, and then air cooled to room temperature. The shell was removed from the core by turning the lathe.

After preheating (hardening, tempering), the products made as described above were subjected to microstructural analysis and physical testing to determine bending strength, Rockwell hardness, and impact strength.

The results of the above test are as follows.

Bending strength Kg/mm ² …………270 Rockwell hardness C ……68 Impact strength Kgm/cm ² ……1.5 From this fact, the products made by the method based on the present invention are superior to the prior art. It can be seen that the strength is increased by an average of 25% and the impact strength is increased by an average of 30% by weight compared to products made based on.

Example 3 A product is made according to the invention with a tool steel powder, the composition of which is in weight percent carbon 1.0, manganese 0.4, silicon 0.4, chromium 3.9, sulfur 0.03, phosphorus.
0.03, the remaining amount is iron. In line with this result, the particle size
Powder particles with a diameter of 800 μm or less were mixed in the above mixing tank for 30 minutes for the purpose of averaging the particle size distribution. This averaged particle size distribution powder was magnetized by being exposed to the action of a fixed field with a strength of 1×10 ³ A/m. This magnetization work
Lasted 0.25 minutes. This magnetized powder is carbon
It was poured into a container made of 0.2% structural steel.
The container is cylindrical with a diameter of 300 mm and a depth of 600 mm. The magnetized powder was vibrated and compressed in this container by vibrating the container at a frequency of 50 Hz and an amplitude of 0.5 mm. The agitation operation on the powder was stopped after 3 minutes and the container was closed by welding a lid with an open end tube fitting. This pipe fitting was connected to a vacuum pump to create a vacuum of 10 ^-2 mm of mercury inside the vessel. At the same time, this container
It is heated to 1130°C and kept at this temperature for 2 hours to proceed with sintering and degassing.

After degassing was complete, the vessel was sealed by closing the tubing fitting and sealing the closure. The container containing the powder and heated to the temperature was drawn into a cylindrical rod with a diameter of 100 mm.

The powdered metal (product) for the rod acts as the core and the deformed container as the shell. The bar was tempered at 850°C for 4 hours, cooled at a rate of 20°C/min to 500°C, and then air cooled to room temperature. The outer shell was removed from the core by rotation of a lathe.

The products thus produced after preheating treatment (hardening, tempering) were subjected to microstructural analysis, physical tests and mechanical tests to measure bending strength, Rockwell hardness and impact strength.

This test was conducted in the same manner as described above.

The results of this test are as follows.

Bending strength Kg/mm ² ......300 Rockwell hardness C...68 Impact strength Kgm/cm ² ......1.8 From this fact, it follows that the powder made by the method according to the invention is better than the powder made by the method according to the prior art. It can be seen that the strength increased by an average of 25% and the impact strength increased by an average of 30% by weight compared to the prepared powder.

Example 4 A product is made of a tool steel according to the invention, the composition of which in weight percent is 1.0 carbon, 0.4 silicon, 0.4 manganese, 3.2 chromium, 0.4 nickel, 9.0 tungsten, 4.0 molybdenum, 2.3 vanadium, cobalt
8.0, sulfur 0.03, phosphorus 0.03, and the remaining amount was iron. As a result, powder particles with a particle size exceeding 800 μm were removed by sieving. Particles having a particle size of 800 μm or less were mixed for 30 minutes in the above mixing tank to average the particle size distribution. A powder with an averaged particle size distribution has a strength of 2×
It was magnetized by exposing it to the action of a fixed field of 10 ⁴ A/m.
This magnetization operation continued for 0.25 minutes. The magnetized powder was poured into a container made of structural steel with 0.2% carbon. The container is cylindrical with a diameter of 300 mm and a depth of
It is 600mm. The magnetized powder in this container was densified by shaking the container at a frequency of 50 Hz and a vibration width of 0.5 mm. The vibratory compression operation was stopped after 3 minutes, and the open end of the container was closed by welding a lid with a tube fitting. This pipe fitting is connected to a vacuum pump and extends 10 ^-2 mm inside the vessel.
A Hg vacuum was applied. At the same time, this container
It was heated to 1130°C and held at this temperature for 2 hours to allow sintering and degassing. After the degassing operation was completed, the container was sealed by closing the tube fitting and sealing the closure. This container containing the powder and heated to the above temperature was drawn out into a cylindrical rod with a diameter of 100 mm.

The powder metal (product) for this rod is as the core,
The deformed container also acts as an outer shell. The produced bar was tempered at 850℃ for 4 hours and cooled down to 500℃ at a rate of 20℃/min.
Air cooled to room temperature.

The shell was removed from the core by turning the lathe.

Thus, the products made after preheating treatment (hardening, tempering) are subjected to microstructural analysis, physical testing, and mechanical testing to determine bending strength, Rockwell hardness, and impact strength. Ta.

The results of this test are as follows.

Bending strength Kg/mm ² ………320 Rockwell hardness C……67 Impact strength Kgm/cm ² ………1.8 From this fact, it follows that products made by the method according to the present invention are not manufactured by the prior art method. It can be seen that the strength is increased by 25% on average and the impact strength is increased by 30% on average compared to the conventional product.

Example 5 A product is made of tool steel powder according to the invention, the composition of which is 1.0% carbon, 1.0% manganese by weight.
0.4, silicon 0.4, chromium 3.9, tungsten 6.0, molybdenum 4.8, vanadium 1.7, cobalt 4.8, sulfur
0.03, phosphorus 0.03, and the remaining amount was iron.

In line with this result, particles with a particle size exceeding 800 μm in the powder were screened and removed. Particles having a particle size of 800 μm or less were mixed in the above mixing tank for 30 minutes to make the particle size distribution uniform. This powder with a homogenized particle size distribution was magnetized by exposing it to the action of a fixed field of intensity 1×10 ⁴ A/m. This magnetization work
Lasted for 0.1 minute. This magnetized powder is carbon 0.2
It was poured into a container made of % structural steel. The container is cylindrical with a diameter of 300 mm and a depth of 600 mm. The magnetized powder in this container was densified by shaking the container at a frequency of 50 Hz and a vibration width of 0.5 mm. This vibration compression work was stopped in 3 minutes,
The open end of the container was closed by welding a lid with tubing fittings. This tubing fitting was connected to a vacuum pump to create a vacuum of 10 ⁻² mmHg inside the container. At the same time, the container is heated to 1130° C. and maintained at this temperature for 2 hours to effect sintering and degassing. Once degassing was completed, the container was sealed by closing the tube connector and sealing the closure.

The container containing the powder and heated to the above temperature was drawn out and made into a cylindrical rod with a diameter of 100 mm.

This rod each acts as a core and the container as an outer shell. The bar was tempered at 850°C for 4 hours, cooled at a rate of 20°C/min to 500°C, and then air cooled to room temperature. The shell was removed from the core by turning the lathe.

The products made in this way after preheating (hardening, tempering) are subjected to structural analysis, physical tests, and mechanical tests to determine the bending strength, Rockwell hardness,
and impact strength were measured.

The results of this test were as follows.

Bending strength Kg/mm ² ………310 Rockwell hardness C……68 Impact strength Kgm/cm ² ………1.8 A product is made from the same powder as above with a lower degree of magnetization. Tested. Comparing the above products to this product, it can be seen that the strength is on average 20-25% higher and the impact strength is 30% higher on average.

Textural analysis revealed that the grain structure of the material forming the product according to the invention was more uniform.

Example 6 A product is made of tool steel according to the invention, the composition of which is 1.0% carbon, 1.0% manganese by weight.
0.4, silicon 0.4, chromium 3.9, tungsten 6.0, molybdenum 4.8, vanadium 1.7, cobalt 4.8, sulfur
0.03, phosphorus 0.03, and the remaining amount was iron.

In accordance with this result, particles with a particle size exceeding 800 μm were removed by sieving. Particles with a particle size of 800μm or less
The mixture was mixed for 30 minutes in the above mixing tank for uniform particle size distribution. This powder with uniform particle size has a strength of 1
It was magnetized by exposure to the action of a fixed field of ×10 ⁴ A/m. This magnetization operation continued for 0.5 minutes. The magnetized powder was poured into a container made of structural steel with 0.2% carbon. The container is cylindrical and has a diameter of 300 mm.
mm, depth 600mm. The above magnetized powder in this container has a frequency of 50Hz and an oscillation width of 0.5mm.
It was densified by shaking it with The vibratory compaction operation was stopped at 3 minutes and the open end of the vessel was closed by welding a lid with tubing fittings. This tubing fitting was connected to a vacuum pump to create a vacuum of 10 ^-2 mmHg inside the vessel. At the same time, the container was heated to 1130° C. and maintained at this temperature for 2 hours to effect sintering and degassing.

After the deaeration was completed, the container was sealed by closing the tube connector and sealing the closed portion. The container containing the above-mentioned powder and heated to the above-mentioned temperature was made into a cylindrical rod having a diameter of 100 mm by drawing.

The powdered metal for each bar acts as the core and the deformed container acts as the shell. The produced bar was tempered at 850°C for 4 hours, cooled at a rate of 20°C/min to 500°C, and then air cooled to room temperature. The outer shell was removed from the core by lathe rotation.

Preheating treatment (hardening, tempering) in this way
The products made after this were subjected to structural analysis, physical tests and mechanical tests to determine the bending strength, Rockwell hardness and impact strength.

The results of this test are as follows.

Bending strength Kg/mm ² ………320 Rockwell hardness C……68 Impact strength Kgm/cm ² ………2.0 From this fact, products made by the method based on the present invention are different from those made by the method according to the prior art. It can be seen that the unit strength is increased by 25% on average compared to the conventional product, while the impact strength is increased by 30% on average.

Example 7 (Negative) The product was made in much the same way as Example 1 and from similar materials. However, in the magnetization process of the powder,
The strength of the fixed magnetic field was varied to 1×10 ² A/m (ie, this is outside the scope of the claims and below the minimum value).

The test results of the manufactured products are as follows.

Bending strength Kg/mm ² ……210 Rockwell hardness C……69 Impact strength Kgm/cm ² ……1.1 From this fact, it can be seen that at the above strength of the above fixed field, the above powder is magnetized to the required range. First, this causes separation of the particles based on the particle size of the powder, which deteriorates the properties of the product when the powder is poured into the container (in comparison to the product of Example 1). In particular, the bending strength is only 1% greater than the non-magnetized product.

Example 8 (Negative) The product was made in much the same way as the example and from similar materials. However, in the magnetization process of the powder, the strength of the fixed field was varied to 5×10 ⁴ A/m (ie, this value is outside the range of claim 2 and is larger than the above maximum value).

The test results of the manufactured products are as follows.

Bending strength Kg/mm ² …………320 Rockwell hardness C ……67 Impact strength Kgm/cm ² ……1.8 From this fact, it is clear that the strength of the product in the above fixed field is lower than the strength based on the present invention. It can be seen that the characteristics of At the same time, in this case, energy consumption is greater and there is no use for it.

Example 9 The product was much the same as Example 3 and was made from similar materials. However, in the magnetization process of the powder, the magnetization time was changed to 0.04 minutes (ie, this value is outside the range of claim 2 and smaller than the above minimum value).

The manufactured products were subjected to testing, and the results are as follows.

Bending strength Kg/mm ² ………230 Rockwell hardness C……68 Impact strength Kgm/cm ² ………1.2 From this fact, the above specified magnetization time is sufficient to magnetize the above powder to the required range. It can be said that there is not enough to do so. This leads to a partial separation of the powder due to its particle size when it is poured into the container, deteriorating the properties of the product (products made according to the claims of the present invention). ).

Example 10 A product was made much the same as in Example 2 and from similar materials. However, in the step of magnetizing the powder, the magnetization time was changed to 1 minute (that is, this value is outside the range stated in claim 2 and exceeds the maximum value).

The manufactured products were tested and the results are as follows:

Bending strength Kg/mm ² ………270 Rockwell hardness C……68 Impact strength Kgm/cm ² ………1.5 From this fact, the specific magnetization time has better characteristics of the product than the magnetization time based on the present invention. It can be said that there is no improvement. At the same time, in this case, energy consumption is even higher and there is no use for it.

Industrial Applicability The present invention can be applied in the fields of metallurgy and mechanical engineering to the production of cylindrical or shaped semi-finished products, such as structural steel, etc., using magnetic iron powder, as well as the production of cermet materials. It can also be applied to fabrication from materials with poor malleability, such as Furthermore, the present invention can also be applied to the production of composite semi-finished products in which two metals are combined in various ways. These semi-finished products can also be applied to the production of strong cutting tools and punching dies.

Claims (1)

[Claims] 1. Mixing of powder for uniform particle size distribution, filling of this powder into a container, vibration compression of this powder, and subsequent heating of the powder in the container to the sintering temperature, In the method of manufacturing a product with ferromagnetic powder, which includes sealing the container and compacting the same, the powder having the homogenized particle size distribution is magnetized before being filled into the container, and the powder to be magnetized is 0.1 for the action of a fixed magnetic field with a strength of 1×10 ³ to 2×10 ⁴ A/m.
A method for producing a product from ferromagnetic powder, characterized by exposure for 0.5 to 0.5 minutes. 2. A mixing tank with a weir at the discharge part for mixing powder, a container for receiving the powder mixed in the mixing tank, and a vibration exciter that is equipped with a support stand on which the container containing the powder is placed and vibrates the container. , an apparatus having a heater for heating the container containing the powder, and a press device for deforming the container containing the powder by being heated by the heater, which is connected to the mixing tank 1; Iron magnetic powder characterized in that an electromagnet 11 is provided to apply a fixed magnetic field with an intensity of 1×10 ³ to 2×10 ⁴ A/m, and the mixing tank 1 and the weir 5 of the mixing tank are made of a non-magnetic material. Equipment for manufacturing products from. 3. The apparatus for manufacturing products from ferromagnetic powder according to claim 2, wherein the electromagnet 11 is disposed below the mixing tank 1. 4. An apparatus for manufacturing products from ferromagnetic powder according to claim 2 or 3, characterized in that a device 12 for approaching and separating the electromagnet 11 is provided inside. 5. The device 12 for approaching and separating the electromagnets 11 is constructed as a vertical guide device 13, to which a carrier 14 is attached, which supports the electromagnets 11 and is connected to a reciprocating drive 15. An apparatus for manufacturing products from ferromagnetic powder according to claim 4, characterized in that: 6 The device 12 for bringing the electromagnets 11 closer to each other and separating them is a column 1 having a horizontal rotating arm 17.
6. The apparatus for manufacturing products from ferromagnetic powder according to claim 4, characterized in that said electromagnet is mounted on said column 16.