JPS6023895B2 - Manufacture of metal casing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal base body, and more particularly, to a manufacturing method for a metal base body, and more specifically, a method for manufacturing a metal base body, and more specifically, a method for manufacturing a metal base body, and more particularly, a method for manufacturing a metal base body, and more particularly, a method for manufacturing a metal base body, and more particularly, a method for manufacturing a metal foundation body by supplying a coolant to the outer surface of the side wall of a metal cup-shaped cylindrical body with an integral bottom during the previous process of an ironing punch. The side wall is squeezed and stretched, and the cylindrical body with the stretched side wall is separated from the punch at the beginning of the return process of the punch, and the next cylindrical body is stretched in the next forward process, so that the stretched cylindrical bodies are successively made. The present invention relates to a method for producing a metal hammer body, which is then used as a foundation body by cutting off the edge of the cylindrical body having an extended side wall.

When the continuous production of the cylindrical body by the ironing punch is interrupted, the outer surface of the ironing punch is heated from the outside surface side with heating fluid during the interruption, and the temperature of the cylindrical body is lower than that before the ironing process. The method is characterized in that the temperature is set to a high temperature within a predetermined range, and the interrupted ironing process is started or restarted using the punch that has reached the temperature within that range. The ironing process in the manufacturing method of this type of metal bonito body is explained with reference to FIG.
A punch drive shaft 2 which has a punch at the tip and can reciprocate within the shaft support part 11 is installed above, and a tattle ring support part 7 (into this support part, there is a punch drive shaft 2 from the side into which the punch drive shaft 2 enters). , a re-drawing die ring 3, a first ironing die ring 4, a second ironing die ring 5, and a third ironing die ring 6 are fixed at appropriate intervals.

In addition, 8 is a lees removal device. ) and key bottom molded part 10
It is carried out using a device consisting of. In addition, 13 is a total support part placed between the punch and the re-drawing die ring 3,
The metal cylindrical body A to be squeezed is placed here. Further, the precise removal device 8 is composed of a large number of claws 9 that are orthogonal to the axis x-x and are slidable toward the axis. These are all known matters. Now, when performing ironing with such a device, the punch is placed in the position before entering the die-ring support part 7, and after the metal cylindrical body A is placed on the support part 13, the movement of the punch drive shaft 2 is started. . As a result, the punchee advances to the left in the figure, passes through the redrawing die ring 3 together with the cylinder A, reduces the diameter of the cylinder A, and extends its side wall in the direction of the bag by approximately the same amount. Then, while supplying the coolant to the outer surface of the side wall of the cylindrical body, the first,
Pass through the second and third training rings 4, 5, and 6,
By doing so, without changing the inner diameter of the cylindrical body, the side wall thickness of each cylinder is reduced to approximately 2/3 of the thickness before ironing.
The side wall is made thinner, and the side wall is extended in all axial directions by an amount corresponding to this thinner thickness. This is a process called ironing. Note that the cylindrical body B with this side wall stretched
until the green edge of the can-bottom molded part 10' gets stuck.
Further, it moves forward together with the punch and is pressed between the punch and the component 10 to form a sieve sole.

Here, the drive shaft 2 moves back together with the machined cylindrical body B,
Eventually, the open end green 15 of the cylindrical body B collides with the claw 9 of the ant removal device 8, and the cylindrical body B is stopped at that position. However, as the drive shaft continues to move back, the cylindrical body B is separated from the punch. The separated cylindrical body B is edged 14 at its open end portion, and becomes a cylindrical body having a predetermined height h (see FIG. 2). By the way, during the continuous production of cylindrical bodies by the ironing process described above, the feeding of the cylindrical body A is interrupted for some reason, and the punch continues to reciprocate despite this. In short, continuous production is interrupted when the supply of cylindrical bodies starts again from the "beating" state and the ironing process is restarted, or when the reciprocating movement of the ironing punch is stopped and a new ironing process is started. When continuous processing is started after the ironing process has been completed, the height of the ironed cylindrical body B will be the same as the start (including restart).
The first cylindrical body is the lowest, the second and third cylinders are the lowest.
It is known that the height gradually increases from the 10th to the 10th, and from about the 10th to the 10th, the height falls within the range of the "second rosette" described below.

In addition, from the height of this first cylindrical body, the "second barrack"
The variation in the height of the cylindrical body up to the height within the range will be referred to as the "first variation". The "second variation" is the variation in the height of the cylindrical body resulting from the variation in the nominal thickness of the overall material.

In other words, the thickness of a tin plate or aluminum plate that is the material of the carcass body has a certain nominal thickness, and there is variation within the allowable range, but the variation in the thickness of this aircraft body material is
This affects the elongation dimension of the cylindrical body in the rut direction due to ironing,
Thicker plates tend to have a higher weld height than thinner plates. This kind of variation in height is
"Second variation". For example, it has been found that when manufacturing a cylindrical body with a standard height of 130 mm from a material of one nominal thickness, there is usually a variation in height of about 3 sides at the maximum and minimum heights. Here, the height of the cylindrical body is the height of the cylindrical body B formed by ironing at the most concave part of the open end green 15 (FIG. 2) that has unevenness in the circumferential direction; That is, it means the minimum height h as a cylindrical body.

Now, if you are trying to manufacture an aircraft with a height of 13 m,
The minimum height h of the ironed cylindrical body B is the minimum size Q that can be cut by going around the open end of the cylindrical body (
It must be a job with (130 x Q) plus (usually considered to be 4 skins).

Therefore, if only the second scattering needs to be taken into account, the cutout dimensions of the bonito body material should be set to the thinnest thickness of the material (
That is, the height of the resulting cylinder is the lowest), and (
130Q) The dimensions should be determined so that a cylindrical body with the height of the fence can be manufactured. The cylindrical body B produced in this way is
Since the height of all of them exceeds the (1300Q) side, the edge of the opening edge will be cut without creating a notch. Therefore, a defective key with a notched edge occurrence will be avoided. However, in reality, the first variation occurs, so the height of the first cylindrical body when ironing is started for the material with the thinnest thickness is within this first variation. If the dimensions of the board are not determined so that the O-legs are added to the ribs (130 x Q18), defective products will be produced.
The 8 legs difference between the above (1300Q) fence and this (1300Q+0) rib is the start (including restart) of the interrupted ironing process.
This was added to prevent cylindrical bodies before and after the first 1q hardening from becoming defective products, and if the ironing process had not been interrupted, most cylindrical bodies would have reached this level of 8. Since there is no need to add any additional dimensions, the waste of material caused by adding these 8 dimensions to the boarding dimensions is extremely large. One way to prevent such waste is to set the board size to the above-mentioned (130cm) side, and the first 1 piece after the ironing process starts (including restarting) to be rejected as a defective product from the beginning. It may be possible to remove the bonito from the flow of the body, but the entire ironing process is manufactured by connecting the machines necessary for its production with runways and conveyors, and by assembly line work at a speed of several hundred bonito per minute. Detection of defective particles requires highly accurate equipment, and is not an economically advantageous method.

The present invention aims to prevent the above-mentioned waste of materials and to provide a method that is sufficiently advantageous from an economic point of view. Stretching the side wall of the cylindrical body while supplying a coolant to the outer surface of the side wall, removing the cylindrical body with the stretched side wall from the punch at the beginning of the return process, and stretching the next cylindrical body in the next forward process;
In a process for manufacturing a metal cage, in which the stretched cylinders are then separated, one after another, and the open end line of the cylinder with the stretched side wall is cut off to form a cage, the continuous production of the cylinders is interrupted. During the interruption, the outer surface of the ironing punch is heated from the outer surface side with a heating fluid to a temperature in a predetermined range higher than the temperature of the cylindrical body before ironing. This is characterized in that the interrupted ironing process is started using a punch that is Regarding the first occurrence of looseness, the inventor believes that the heating temperature of the die ring due to frictional heat during ironing of the bottomed cylindrical body is offset by the cooling effect of the coolant, but during continuous manufacturing. The coolant in this ter-filling part has almost no effect on the punch, so it is assumed that as the number of punch ironing increases, the temperature rises and expands, reducing the gap with the die-ring. , the temperature of the punch was measured. The results are shown in FIG. The measurements shown in this example are from a tin plate with a side thickness of 0.34 and a temper of 1.
11. When manufacturing the foundation body on the side of the foundation height of approximately 123, 120
Using an ironing machine with a rotation speed of 1,000 times per minute, the first
This is the value obtained using a thermocouple electromotive force measuring device to measure the surface temperature of the punch, which has been ironed three times (second and third), removed the ironed cylindrical body, and laid back down. .

In this table, curve a shows the change in punch temperature, and curve b shows the temperature change in the third die ring itself for reference.

Note that the straight line c indicates the temperature of the coolant. As can be seen from the table, the punch is heated from a temperature equal to the initial coolant temperature to the first
After completing the ironing process of the cylindrical body with a bottom, the temperature rose by about 2,000 degrees to about 30°C, and after the cylindrical body with a bottom of the first item was ironed, the temperature was close to 70 oo, and from around this point the temperature rose to about 30°C. The rise in temperature has slowed and is expected to remain almost constant.

Based on the above measurement results, while the continuous ironing process was interrupted, the outer surface of the punch was flooded with heated fluid from the outside side, and ironing process was started using the flooded punch. In each case, the height of the ironed cylindrical body was measured.

The results are shown below. 54q0 as a panchkalo warming means
When you start squeezing using a punch with hot liquid poured on its outer surface for a long time, the difference between the height of the first cylindrical body and that of the first flea will be the average value. So 4.
8 Yanagi, and the difference when using 8 Pi 0 liquid was virtually zero.

On the other hand, when the punch was not heated in any way by the conventional method, the difference was on the 5.3 side. In this measurement, the same aircraft material, moth dimensions, and processing equipment as in the measurement of FIG. 3 were used. From the above, during the interruption, the outer surface of the punch is heated from the outer surface side by the heating fluid, and at the start of ironing, the outer surface of the punch reaches a temperature in a predetermined range that is higher than the temperature of the cylindrical body before ironing. I learned that if I did this, I could reduce the first variation to almost zero.

The appropriate temperature for the ironing process may vary depending on the material of the iron, the size of the iron, the equipment used, etc., but this can be easily determined through experimentation. FIG. 4 shows an example of an apparatus for implementing the present invention, and the entire apparatus is designated by 20.

21 is a ring provided so as to surround the punch 1 when the punch drive shaft 2 is near the end of its backward movement;
1 is provided with a flooding fluid passage 22 and a coolant passage 23 that penetrate from the outside to the inside, and the heating fluid sent into the ring 21 through the heating fluid passage 22 flows outside the punch. A channel (not shown) is cut into the ring that surrounds the surface and evenly heats the entire outer surface of the punch, and the coolant also flows through another channel so that the entire punch is cooled evenly. Channels (not shown) are cut into the ring.

However, if the warming fluid does not require cooling, the passage 23 is
It is not necessary. In this example, steam at about 105°C was used as the heating fluid, so the cooling agent for ironing (about 105°C) was used as the heating fluid.
qo) was introduced from the passage 23, the temperature of the steam was adjusted to about 8,000 ℃, and it was used to heat the outer surface of the punch.

As a method for heating the punch, in addition to a method of heating the punch from the outside surface using a heating fluid as in the method of the present invention, a method of heating the punch from the inside surface by passing a heating fluid through the inside of the punch is also considered. However, since this type of punch is made of cemented carbide, which has relatively poor thermal conductivity, it takes a relatively long time for the outer surface of the punch to reach the specified temperature when heated from inside the punch. If the outer surface of the punch does not reach the specified temperature, the desired outward expansion will not occur even if the inner surface of the punch reaches the specified temperature.) and the internal structure of the punch becomes complicated. This method is not preferred because it has the drawbacks of increasing manufacturing cost and decreasing punch strength. On the other hand, since the method of the present invention heats the punch from the outer surface side, it is possible to bring the outer surface of the punch to a predetermined temperature only by heating for a very short time (within 1 inch). In order to carry out this process, it is only necessary to provide a simple device as shown in FIG. 4, and since a conventional punch can be used as is, there is hardly any cost increase factor.

When using the punch heated in this way, the first
The cylindrical body from No. 2 to No. 2 was edge-trimmed, and the medium t (Fig. 2) of the cutting waste generated from the edge cutting was measured, and the results ranged from a minimum of approximately 7 sides to a maximum of approximately 11 willows.

The results of applying the conventional method to the same wood material with the same cutting dimensions are that the t in the cutting shoulder ranges from a minimum of 4 ribs to a maximum of 9.5 ribs.
It was a fence. That is, for materials under the same conditions, in the conventional method, the smallest number of cutting chips was 4 pieces, but when using the method of the present invention, there were 7 pieces. In other words, according to the method of the present invention, the number of parts to be cut out increases by three sides. However, since this is a case where materials of the same size are used, the method of the present invention requires a portion corresponding to these three fences.
This means that there is room to reduce the board size (diameter) of the solid material. That is, in order to apply the method of the present invention and still maintain the narrowest value of the middle t of the cut shoulder to four ribs, it means that an original plate with a diameter correspondingly smaller is used. Needless to say, this directly leads to saving on materials. In this example, a total material reduction of 2.7% was achieved.
The above explanation has been made for a bonito shell made of tin plate with a height of about 123 and a mill diameter of 211, but the method of the present invention can also be applied to aluminum and chemically treated steel sheets,
It is also applicable to fabrics with moth height.

As described above, according to the present invention, the continuous production of stretched cylindrical bodies by ironing pans is interrupted (when the ironing machine is completely stopped, or when the ironing process is stopped due to the supply of cylindrical bodies being stopped). This prevents the occurrence of stretched cylinders (irregularly processed cylinders) that are insufficient in height when starting continuous production of stretched cylinders using the ironing punch after processing is stopped (in the case of stopping processing). This has the great effect of making it possible to significantly reduce the amount of heat used.Moreover, only a single cylinder is required to carry out the process, and the heating method involves directly heating the outer surface of the punch to be heated with a heating fluid. It has the advantage that it is extremely efficient, and requires only short heating time, so it costs almost nothing.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view showing an outline of an example of ironing equipment, Figure 2 is a front view of a cylindrical body that has been ironed before edge cutting, and Figure 3 is a cylindrical body after ironing is completed. FIG. 4 is a graph showing changes in the punch surface temperature a, and is an explanatory diagram of an example of the punch heat supply means in the method of the present invention. 1...Punch, A...Cylindrical body, B...
...Stringed cylindrical body, 3... Re-drawing die ring, 4... First ironing die ring, 5...
...Second ironing die ring, 6...Third ironing die ring, 15... Open □ end of cylindrical body B, h'...
The height of the cylinder, t...inside the cutting waste. Soup='Picture Z Picture Spear 4 picture

Claims (1)

[Claims] 1. During the forward process of the ironing punch, ironing is performed while supplying a coolant to the outer surface of the side wall of the metal integral bottom cylindrical body to stretch the side wall, and the cylindrical body with the stretched side wall is The punch is separated from the punch at the beginning of the return process, the next cylindrical body is stretched in the next forward process, and then released, the stretched cylindrical bodies are continuously manufactured one after another, and finally the opening edge of the stretched cylindrical body is In the manufacturing method of metal cans, which obtain cans by cutting edges,
While the continuous production of the cylindrical body by the ironing punch is interrupted, the punch used for the ironing process is heated from the outer surface side with a heating fluid to lower the temperature of the cylindrical body before the ironing process. A method for manufacturing a metal can body, characterized in that ironing is started using the punch whose outer surface temperature is within a predetermined high temperature range.