JPH0441603A - Method for compacting powder into magnetic metal pipe or bar - Google Patents

Abstract

PURPOSE:To compact powder into a slender magnetic metal pipe or bar having uniform density by penetrating a mortar hole on a table in a powder press, introducing the magnetic metal powder attracted to a magnetic bar into the mortar hole together with the magnetic bar and compress-compacting with mallets from upper and lower sides. CONSTITUTION:In the powder press with the mortar hole 2 for compacting bored on the table 1 and set with the pestles 3, 4 for compacting powder at upper and lower sides, the magnetic metal powder 6 in a powder box 9 is attracted with the magnetic force to peripheral surface of the magnetic bar 5. By driving this magnetic bar 5 with a driving lever 52, the magnetic bar is introduced into the mortar hole 2 together with the above magnetic metal powder 6. Successively, in the process, which the pestles 3 and 4 reach advancing position, the above magnetic metal powder 6 is compressed to form the cylindrical compact product 8 on peripheral face of the magnetic bar 5. The weight of the compact product 8 compress-compacted with this, is always the constant and also the density at each part is uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION (Background and Objects of the Invention) This invention relates to a means for producing metal tubes or bars, but at the same time this invention relates to the production of metal tubes or rods as a step preceding the sintering step in powder metallurgy. This invention relates to powder molding means.

The means for producing metal rods of a predetermined diameter and metal tubes of a predetermined diameter and wall thickness are generally lathe processing or drawing processing. However, due to the high temperatures required to produce the castings used as raw materials, it may be difficult to impart desired physical properties to the rods and tubes.

Therefore, in response to such circumstances, and since it is easy to mix materials, powder metallurgy technology has been developed in which material powder is sintered at a temperature below the melting point of the material.

As is well known, powder metallurgy technology involves sintering a molded metal powder molded using a powder press in a sintering furnace, so the material density of the molded product before sintering is highly uniform in each part. The most important thing is that. This is because if the density of each part is not uniform, deformation occurs during sintering, making it impossible to obtain a product with the desired shape and size.

By the way, for example, if a thin and long tube with an outer diameter of 30 mm, an inner diameter of 29 mm+, and a length of 50 mm is required as the molded product, the mold in the powder press should have a diameter corresponding to the wall thickness of the molded product. The size of the power mold gap is Q, 5txm, and the length is, for example, 100rrtn, which is extremely elongated.

If the material to be filled into the mold is a liquid with high fluidity, it can be filled into the narrow mold gap as described above, but if the material is a liquid with poor fluidity,
Even if a powder of magnetic metal such as iron or nickel is introduced into such a gap, a bridge is formed at the entrance of the mold gap, and the mold cannot be filled. Even if it were possible to fill the mold with the help of a thin ram, for example, the density of the powder would be uneven in each part of the mold, and the total amount of powder introduced into the mold would vary greatly from job to job. It is almost impossible to obtain a sintered product with desired uniformity in shape, size, weight, and density of each part. Even when molding thin rods with several diameters using magnetic metal powder, the difficulty in obtaining the desired sintered product is the same, although there are differences in degree. It was not possible to apply powder metallurgy technology to

Therefore, the main object of the present invention is to provide a means for shaping magnetic metal powder such that powder metallurgy techniques can be applied to the production of elongated magnetic metal tubes or rods.

(Structure of the Invention) Hereinafter, the method of the present invention will be explained with reference to the process diagrams of the embodiment shown in FIGS. ing. Reference numerals 3 and 4 denote a pair of pins arranged coaxially and oppositely to the slotted hole 2 with the table 1 in between. In this invention, it is one of the requirements of the invention that powder is introduced into the above-mentioned hole 2 and the introduced powder is compression-molded by the kinematics 3 and 4. However, for general powder presses, such requirements themselves are of course well known.

Further, according to the present invention, one of the pair of kinematics 3.4 is set to (al) in each of FIGS.
As shown in the figure, it is also a requirement of the invention that it be inserted into the hole 2 in advance. However, this requirement is also known.

Next, according to the present invention, referring to f(a) in each of the above figures, the magnetic metal powder 6 which has been attracted and adhered to the magnetic bar 5 in advance is placed in the hole with the magnetic bar 5 as shown in fdl in each of the above figures. 2. However, (dl in FIG. 3) is shown with the magnetic rod 5 inserted into the hole 2 moved further downward.

Next, according to the present invention, the wall surface of the magnetic rod 5 introduced into the slotted hole 2 as described above or the extension rod 7 made of non-magnetic metal that is axially connected to the magnetic rod 5, and the above-mentioned 1. It is characterized in that the end wall surface 31 of the screw 3 on the other hand and the peripheral wall surface of the slotted hole 2 form a mold for the magnetic metal powder introduced into the slotted hole 2 as described above.

However, regarding the wall surface of the magnetic rod 5 in forming the mold or the extension rod 7 that is axially connected to the magnetic rod 5, in the case of the first embodiment shown in FIG. 1 and the fourth embodiment shown in FIG. This is the peripheral wall surface, and in the second embodiment shown in FIG. 2, the extension rod 7
This is the surrounding wall surface. According to the third embodiment shown in FIG. 3, it is the end wall surface 51 of the magnetic rod 5.

After the mold is formed in this way, there is a
el, Fig. 2+f+, Fig. 3), Fig. 4 (as shown in el), the magnetic metal powder 6 inserted into the hole 2 is compression molded,
As shown in FIG. 1 if+, FIG.
It is natural to take out the molded product 8.
extrusion (7 ejection means are well known. In the second and third embodiments, the extrusion process of such a molded product 8 is not shown or omitted, but It will be easily understood as corresponding to Figure ff).

Examples of the method of this invention will be described below.

1st Example (See Figure 1 @) This example relates to powder molding means for a long and thin magnetic metal tube. In the apparatus used in this example, kine 3.4 is the intended molded product 8. It is a hard metal cylinder with a wall thickness that corresponds to that of the tube. The pins 3 and 4 can be moved forward and backward in the axial direction of the hole 2 by hydraulic or mechanical driving means, respectively.

In the device, reference numeral 91 denotes an arm of a powder feeding device having a powder layer 9 at the front, the powder 9 being slidably placed on a table 1, and both its top and bottom surfaces are open.

The screw 3 is positioned at a predetermined retracted position in the slot 2 as shown in fal~(e), and the table 1 as shown in ridge).
It is driven forward and backward from the forward position, which is at the level of the surface. The end surface of the other kinematics 4 is driven to advance and retreat between a predetermined retreat position above the powder i9 and a predetermined forward position in the slot 2 as shown in (al).

The powder layer 9 moves forward and backward between a predetermined retreat position on the table 1 as shown in (fal, fed, ge) and a forward position where the bottom surface is located at the entrance of the slotted hole 2 as shown in (bl~(dl). It is driven.

In this device, the magnetic pole 5 is slidably connected to the kinematic 3.
The shaft is inserted into the cylinder, and the bottom thereof is connected to the drive rod 52. The magnetic poles 5 are fat, fbl and fdl~
(As shown in fl, there is a retracted position where the tip is at a position corresponding to the level of the table 1 surface, and a predetermined position where the tip is above the powder layer surface of the magnetic metal powder 6 accommodated in the powder layer 9. It is driven forward and backward by a drive rod 52 between the forward position and the forward position.

The magnetic pole 5 is, as shown in FIG. A uniform magnetic field is created on the surface.

The apparatus used in the first embodiment of the method of this invention is as described above. Next, the first embodiment of the method of this invention will be described.

That is, fat indicates the rest position of the device, and in this rest position, the powder 1799 containing the metal powder 6 and the metal powder 6 are both in the retracted position described above.

(bl indicates the first powder feeding preparation position of the device; in this position, the kinematics 3 and 4 are both in the retracted position, and the powder 19 is in the forward position.The powder layer 9 in this position is in its open state as described above. The bottom surface of the hole 2 is engaged with the entrance of the slotted hole 2, but most of the entrance area of the slotted hole 2 is occupied by the end face of the magnetic pole 5, and the area around the magnetic pole 5 is a small portion that forms the above-mentioned mold. Since there is only a cylindrical mold gap 21, the magnetic metal powder with poor fluidity forms a bridge at the entrance of the mold gap 21, and is prevented from entering the mold gap 21.

(C) shows the second powder feeding preparation position of the device. In this position, both of the pins 3 and 4 are in the above-mentioned retracted position, but the magnetic pole 5 is in the above-mentioned forward position, and therefore the magnetic metal powder 6 is magnetically attracted to the circumferential surface of the magnetic pole 5, forming a cylindrical layer. It has become attached.

(di indicates the powder feeding position of the device, and at this position,
(Since the magnetic pole 5, which was in the forward position at C1, is driven backward by the drive rod 52, the magnetic metal powder that was attached to the circumferential surface of the magnetic pole 5 in a cylindrical shape as described above is removed from the backward position of the magnetic pole 5. Accordingly, the mold is filled by being introduced into the mold gap 21 together with the magnetic pole 5.Excess magnetic metal powder adhering to the magnetic pole 5 in the fcl is deposited at the mouth edge of the slotted hole 2 at the entrance of the slotted hole 2. Since the amount of magnetic metal powder introduced into the mold in (d) is always constant, and the magnetic metal powder is evenly attached to the circumferential surface along the length of the magnetic pole 5, The density of the magnetic metal powder introduced into the mold is uniform over the entire length of the hole 2.

tel indicates the molding position of the device. In this position, the kinematics 3 and the powder bed 9 are in the retracted position, while the kinematics 4, in the process of reaching the illustrated forward position, compresses the magnetic metal powder introduced into the mold at (dl), thus
A cylindrical molded product 8 is formed on the circumferential surface of the magnetic pole 5 . In this molded product 8, the amount of magnetic metal powder around the magnetic pole 5 is constant in the fdl, and its density is uniform over the entire length, so the weight of the molded product 8 compressed in the tel is always constant, and the weight of the molded product 8 is always constant and The density in each part of the object 8 is uniform.

Figure 2) shows the molded product discharge position of the device. In this position, the kinematics 4 and the powder bed 9 are in the retracted position similar to the rest position of fal, while the kinematics 3 is in the aforementioned forward position.

That is, in the process from the molding position of tel to the molded product discharge position of (fl), the molded product 8 in (el is extruded onto the table 1 by the kinematics 3 that is driven forward. In the process of moving from the discharge position of if) to the first powder feeding preparation position of fb),
It can be pushed out in its forward direction by the powder i9 and removed from the surface of the table 1, or it can also be removed by other removal devices at the removal position of the stubble.

Second Embodiment (See Figure 2) This embodiment relates to powder molding means for a magnetic metal tube having the same shape as the first embodiment described above.
This embodiment is designed to increase the compression ratio of the magnetic metal powder introduced into the mold during the transition from the powder feeding position shown in Figure 1 fdl to the molding position shown in Figure 1 tel in the first example. It is especially suitable for situations where it is necessary to apply forceful pressure.

That is, in the device used in the second embodiment,
The structure of the table 11, the slots 2, the pins 3, 4, the powder bed 9, and the means for driving the straw are completely the same as in the first embodiment.

The wire rod 5 itself connected to the drive rod 52 is also similar to the first embodiment, but the wire rod 5 used in the second embodiment has a wire rod 5 having the same diameter as the wire rod 5 at its tip. The difference from the first embodiment is that an extension rod 7 made of hard metal is connected.

The forward and backward positions of the wire rod 5 in this example indicate the second powder feeding preparation position in this example (at C1, the tip of the wire rod 5 is connected to the magnetic metal powder 6 in the powder layer 9). The forward position of the wire rod 5 in this embodiment is similar to that in the first embodiment in the second powder feeding preparation position in that it is at a predetermined position above the powder bed.

However, regarding the retracted position of the wire rod 5, in the case of the first embodiment, the retracted position is the position where the tip of the wire rod 5 is at the same level as the table 1 surface, whereas in the second example, the retracted position is the powder feeding position. (As you can see from dl, the retracted positions of the wire rod 5 are the first retracted position where the tip of the wire rod 5 is at the level of the first surface of the table, the rest position fat, and the first powder feeding preparation position mountain) ,
Is it coming from the molding preparation position fir (el, molding position)? Here, the tip of the extension rod 7 connected to the wire rod 5 is located at the level of the table 1, and J. This embodiment differs from the first embodiment in that it has two retreat positions.

As explained below, in the device used in the second embodiment, the extension rod 7 is connected to the tip of the wire rod 1), and the retracted position is 2 in the reciprocating history of the wire rod 5. This embodiment differs from the first embodiment in only 4j points, and the other points are the same as the apparatus used in the first embodiment.

The method of the second embodiment will be described below. The rest position of the device indicated by tel and the first powder feeding preparation position indicated by fbl are the same as those of the first embodiment. However, as described above, in both of these positions, the wire rod 5 is in the retracted position as in the first embodiment, but in that case, the end surface of the extension rod 7 is located at the level of the table 1 surface.

Similar to the first embodiment, fcl indicates the second powder feeding preparation position, in which the pins 3 and 4 are in the backward position, the wire rod 5 is in the forward position, and the magnetic metal powder 6 is in the same position as in the first embodiment. +ff1HJ,
It is attached in a cylindrical shape around the wire rod 5 (7).

In the process of moving from the second powder feeding preparation position ff1 (C1 to the powder feeding position fdl), a certain amount of the magnetic metal powder attached around the wire rod 5 is introduced into the hole 2, and at that time, the Similarly to the first embodiment, the density of the metal powder is uniform over the entire length of the hole.

In the powder feeding position (dli) of the second embodiment, the wire rod 5 is in the first rear position described above, and the tip of the wire rod 5 is at the same level as the table 1 surface.

tel indicates the molding preparation position in the second embodiment. In this position, the wire rod 5 is in the second retracted position described above, with the tip of the extension rod 7 being located at the level of the surface of the daple 1. From powder feeding position (d) to molding preparation position a t
In the process of transition to el, the magnetic metal powder attached around the wire rod 5 at the powder feeding position fdl is peeled off from the wire rod 5 by the inner edge of the end surface of the kine 3 as the wire rod 5 retreats.
It remains around the extension rod 7 in the same form as it was attached to the wire rod 5.

ge) is the molding position corresponding to the molding position (el) of the first embodiment, at which time a mold is formed by the circumferential surface of the slotted hole 2, the circumferential surface of the extension rod 7, and the end surface of the pin 3. The magnetic metal powder remaining around the extension rod 7 at the molding preparation position tel is compressed and molded in the mold described above under the pressure of the kinematics 4 to form a cylindrical molded product 8.However, at this time, In the molding die in the first embodiment, the peripheral surface of the wire rod 5 was an element of the mold, but in the second embodiment, the extension rod 7, which is significantly stronger than the wire rod 5, is used instead of the wire rod 5. Since it is a mold element, a large compression ratio can be obtained by applying a large pressure to the magnetic metal powder in the mold, and the particle structure of the molded product can be made denser.

Although FIG. 2 does not show the molded product discharge position corresponding to FIG. 1, the molded product discharge position corresponding to FIG. 5
It will be understood that the extension rod 7 is present as an element of the mold instead, and that it is exactly the same as in FIG. 1 (fl).

Although FIG. 6 shows an assembly of the wire rod 5 and the extension rod 7 in the second embodiment, the structure of the wire rod 5 is the same as that shown in FIG.

Third Embodiment (See FIG. 3) This embodiment relates to powder compacting means for a magnetic metal bar. In the apparatus used in this example, table 1
, the screw holes 2, the pins 3 and 4, the powder layer 9, and their driving means are completely the same as those in the first and second embodiments, except that the pin 4 is not cylindrical but columnar. be. The wire rod 5 connected to the drive rod 52 (see (C)) is also the same as in the first embodiment.

The forward position of the wire rod 5 (see (C)) is the same as in the first and second embodiments.

Regarding the movement of the wire rod 5 back and forth, it is the same as in the second embodiment in that there are two retracted positions, a first retracted position and a second retracted position. Regarding the first retracted position ((al, (see bl)), the tip of the wire rod 5 is located at the level of the first surface of the table;
bl, (d), tel, ge) or similar to (d) of the second embodiment (see Figure 2) but in the second retracted position (
(See Figure 3 fdl, tel, ge)).
Example (Figure 2 (al, (bl, tel, (fl)
In the case of the third embodiment, the tip of the wire rod 5 is below the end surface of the kinematics 3, whereas in the case of the third embodiment, the tip of the wire rod 5 is at the level of the end surface of the kinematics 3, which is different from the second embodiment. It's different from the case.

In other respects, the apparatus used in this embodiment is no different from the apparatus in the first or second embodiment.

The method of the third embodiment will be explained below. The wire rod 5 at the same position is located at the first retracted position.

fcl indicates the second powder feeding preparation position as in the first and second embodiments, in which case the pins 3 and 4 are in the retracted position, the wire rod 5 is in the forward position, and the magnetic metal powder is in the same position as in each of the above embodiments. As in the example, it is attached around the wire rod 5 in a cylindrical shape.

fdl indicates the powder feeding position, in which the wire rod 5 is in the aforementioned second retracted position, the end surface of the wire rod 5 being at the level of the end surface of the kine 3. Therefore, at the powder feeding position ff1f ldl, a mold is formed by the peripheral wall surface of the slotted hole 2, the end surface of the screw 3, and the end surface of the wire rod 5 that is on the same level as this end surface.

In the process of transition from the second powder feeding preparation position (C1) to the powder feeding position (di), the magnetic metal powder that had adhered around the wire rod 5 as described above is removed from the kinesi as the wire rod 5 retreats. 3
The powder is peeled off by the top edge of the powder and accumulated from the bottom to the top of the hole 2, and the overflowing powder is combined with the powder in the powder 9. Therefore, the amount of powder accumulated in the hollow hole 2 which has become a mold is a constant amount, and its density is constant at each location within the hollow hole 2.

tel indicates the molding preparation position, and its powder remover -9 is in the retreat position. When feeding powder into the slotted hole 2 with the wire rod 5, the slotted hole 2
The powder overflowing from the powder supply position fdl to the molding preparation position a
Since it is removed by powder-9 in the process of transition to Tel, a certain amount of powder with a constant density remains in the filled hole 2 which has become a mold.

ge) is a molding position corresponding to (el) in the first embodiment or ke in the second embodiment, and the powder filled in the mold as described above is compressed by the kinematics 4, resulting in a molded product 8. A magnetic metal bar is formed.

Here, the molded object 8 formed in the screw hole 2 moves forward to the forward position at the same time as in the first figure).
By advancing the wire rod 5, which is in the retracted position, to the first retracted position, the discharge of the molded product 8 can be completed.

Fourth Embodiment (See Figure 4) This embodiment relates to powder molding means for a magnetic gold jiE tube similar to the first or second embodiment. While magnetic metal powder is supplied into the slotted hole 2 using a wire rod 5 projected from the inside onto the table 1, in this embodiment, the wire rod 5 provided outside the slotted hole 2 is used to feed the magnetic metal powder into the slotted hole 2. This is for feeding powder into hole 2.

That is, in the apparatus used in the fourth embodiment,
The configurations of the table 1, the slotted holes 2, the kinematics 3, 4, and the powder bed 9 and their driving means are the same as those of the previous embodiments, except that the powder bed 9 in this embodiment has a bottom. Same as in case.

The wire rod 5 in the device used in this embodiment is the iron core of an electromagnet that is temporarily magnetized by energizing a solenoid F (not shown). This wire rod 5 is slidable with the kinematics 4.
The shaft is inserted into the cylinder, and it is driven forward and backward hydraulically or mechanically.

In the apparatus used in this embodiment, eight non-magnetic metal rods 10 are slidably inserted into the cylinder of the kinematics 3.

The wire rod 5 in the device has a retracted position in which the tip is at a predetermined position above the powder layer 9 as shown in (al, (C1, if month), while the wire rod 5 has a retracted position in which the tip is located at a predetermined position above the powder layer 9 as shown in (bl). a first forward position, which is a position corresponding to the depth;
As shown in (e)), it has two forward positions, including a second forward position, which is a predetermined position where the tip extends beyond the position of the end surface of the kinematics 3.

The eight rods 10 described above are (al, (b), (C),
(As shown in f+, it has a forward position where the tip is at the same level as the surface of the table J and a retreat position where the tip is retreated from the level of the end surface of the kinematic 3. Regarding the forward and backward movement of the 8 rod 10 In this case, an independent drive device can be omitted by using a spring that presses the rod in the forward direction and providing a stopper whose end surface stops at the level of the table surface.

In the following, the method of the fourth embodiment will be explained. Regarding the static position shown in fal and the first powder feeding preparation position shown in Similar to the example.

That is, according to this embodiment, by positioning the wire rod 5 in the forward position within the powder 9, a cylindrical powder layer is adhered and formed around the wire rod 5.

Second powder feeding preparation position 11f (at C1, the wire rod 5 and the powder layer to which the cylindrical powder layer is attached and formed as described above)
9 have each retreated to the retreat position.

(dl indicates the powder feeding position, and the wire rod 5 has advanced to the second forward position described above. In the transition process from the second powder feeding preparation position (C) to the powder feeding position +d), the wire rod 5 Since the excess powder adhering to the hole 2 is peeled off by the edge of the hole 2, the powder supply to the hole 2 is quantified and has a constant density. The residual powder 11 remaining on the table IF during powder feeding is removed by blowing means or the like.

At this time, the wire rod 5 can be demagnetized.

fe) indicates the molding position, and at that time, the circumferential surface of the hole 2 and
A mold is formed by the peripheral surface of the wire rod 5 and the end surface of the kinematics 3. At the powder feeding position fit (d), the powder introduced into the screw hole 2 by the wire rod 5 moves forward to the forward position.
The molded product 8 is formed by compression molding.

1) shows the molded product discharge position corresponding to the first embodiment (FIG. 1), and at this time, the kinematics 4, the wire rod 5, and the kinematics 4 retreat to the retreat position, while the kinematics at the rear position The molded product 8 is discharged onto the table 1 by advancing the 3 and 8 rods 10 to the forward position.

For convenience of explanation, the devices used in the first to fourth embodiments listed above are all illustrated as vertical devices in which the wire rods 3, 4, wire rods 5, and 8 rods 10 are driven in the vertical direction. The lever 3 can also be called a lower barrel, and the lever 4 can also be called an upper barrel, but according to the present invention, it is easy to change to a horizontal device in which each of these elements and the slotted hole 2 are provided in the horizontal direction. However, powder feeding to the wire rod 5 at this time is not done by the powder layer 9 described on each side, but by sprinkling or spraying magnetic metal powder onto the wire rod 5 while rotating the wire rod 5, and performing each of the above-mentioned operations. As in the example, a cylindrical powder layer can be formed on the wire rod 5 outside the table 1.

That is, as described above, according to the present invention, the magnetic metal powder that has been suctioned and adhered to the wire rod in advance is introduced into the screw hole together with the wire rod, and the wire rod inserted into the screw hole or axially connected to the wire rod is introduced into the screw hole. a wall surface of a non-magnetic extension rod, and an end wall surface of one of the screws inserted into the hole in advance;
Its feature is that the wall surface of the slotted hole forms a mold for the magnetic metal powder introduced into the slotted hole as described above.

That is, the mold is formed only when the magnetic metal powder is drawn into the hole by the wire rod. In other words, the mold gap and mold entrance are formed at the same time as the magnetic metal powder is filled, so no matter how narrow the mold gap or mold entrance is, when the mold is completed, The mold has already been filled with powder. Unlike conventional powder molding means, powder is not fed into a mold that has been prepared in advance. Therefore, no matter how deep the mold corresponding to the molded product to be produced is, no matter how narrow the gap between the molds or the entrance of the mold, the powder can be reliably filled.

In addition, in this invention, as can be seen from the above embodiments, when the powder is introduced into the hole bored in the table,
Powder adhering to the wire rod in excess of the required filling amount is peeled off by the edge of the entrance of the slotted hole and remains outside the slotted hole.
The amount of powder filled into the mold by introducing it into the hole is always constant.

Further, according to the present invention, there is no difficulty in obtaining a wire rod that forms a uniform magnetic field within a certain length range using known techniques, and therefore, such a wire rod can be introduced into the hole and filled in the mold. The resulting magnetic metal powder has an even density distribution (effect of the invention).Thus, according to this invention, even if the intended molded product, such as a tube or rod, is extremely long and thin, In addition, even if the tubes and rods are extremely thin, they can be reliably molded using magnetic metal powder, while molded products with consistent weight and uniform density distribution can be obtained. As a result, by uniformly heating the molded product in a sintering furnace, a sintered product of magnetic metal without deformation can be produced with high efficiency. Therefore, this invention makes it possible for the first time to apply powder metallurgy technology to the production of elongated rods and thin-walled long tubes made of magnetic metals.

[Brief explanation of drawings]

Figure 1 is a molding process diagram of the first embodiment of the method of this invention;
The figure is a molding process diagram of the second embodiment, Figure 3 is a molding process diagram of the third embodiment, Figure 4 is a molding process diagram of the fourth embodiment, and Figure 5 is a line diagram of the first embodiment. FIG. 6 is a longitudinal sectional view of an example of the wire rod and extension rod assembly in the second embodiment. ■ is a table, 2 is a slotted hole, 21 is a mold gap, 3°4 is a pin, 31 is an end wall surface, 5 is a magnet bar, 51 is an end wall surface, 52 is a drive rod, 53 is a non-magnetic tube, 54 is a separator, 55 is a permanent magnet, 6 is magnetic metal powder, 7 is an extension rod, 8 is a molded product,
9 is the powder 1191 is the arm of the powder feeding device, IO is 8 rods, and 11 is the remaining powder. (=”) F/ (b) (C) F/G, 3 (b) (C) (d) (e) (-r) F/G, 6

Claims (1)

[Claims] In a powder molding method, the powder is introduced into a slotted hole penetrated through a table of a powder press, and the powder is compressed and molded by a pair of pins arranged coaxially with the slotted hole with the table sandwiched therebetween. One of the pins is inserted into the slotted hole in advance, and magnetic metal powder, which has been attracted and adhered to the magnetic bar in advance, is introduced into the slotted hole together with the magnetic bar, and the magnetic bar inserted into the slotted slot. Or molding of the magnetic metal powder introduced into the slotted hole as described above by the wall surface of a non-magnetic extension rod axially connected thereto, the end wall surface of the one screw, and the wall surface of the slotted hole. 1. A powder molding method for a magnetic metal tube or rod, the method comprising: forming a magnetic metal tube or rod.