JPS58107247A - Method for piercing deep hole into long shaft - Google Patents

Abstract

PURPOSE:To pierce a deep hole using a short knock out pin and a device of simple structure in piercing a deep hole with a knock out device by performing formation of a hollow on the end face of a long shaft material, formation of a deep hole, draw of circumference and finish of inside of the deep hole successively. CONSTITUTION:A hollow 2 is formed on the lower end face of a shaft blank material 1 using the first die case of the first knock out device and a knock out pin. A deep hole 3 is formed into the material 1 using the second die case of the second knock out device and a knock out pin 23. The pin 23 comprises of two stages, i.e. a pin 31 having plural fingers 30 on the upper end and a piercing pin 32 positioned between fingers 30. The periphery 4 of the deep hole 3 is drawn in the direction of the arrow by the third die case and a knock out pin having a flat tip to form a deeper hole 3 of small diameter. Inside of the hole 3 is finished by the fourth die case and the pin of two stage structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drilling a deep hole in the axial direction of a long shaft of a melt, etc., and in particular, it is possible to drill a deep hole using a die with a simple structure and a short knockout bottle. Regarding how it was made possible.

Conventionally, there are two methods for drilling deep holes in long shafts, such as those shown in "-": one method uses a long knockout and die, and the other uses a drilling device. However, the knockout device is complicated and workability is poor, and the depth of the hole required for assembly into the die is limited, which limits the drilling depth of the product.Also, the complicated structure causes damage to the knockout bin. On the other hand, when using a drill, it is extremely difficult to accurately drill a hole that is quite deep for its diameter.

The present invention has been made based on the conventional arrangement as described above, and allows the use of a short knockout bin and a knockout device with a simple structure, as well as a deep knockout bin that makes it extremely easy to replace the knockout bin in the event of damage. The purpose is to provide a method for drilling holes.

The gist of the present invention is that a first
The second step is to form an even deeper hole in the concave part of the material using a two-stage knockout bin, and the second step is to draw the area around the deep hole in the material to create a smaller diameter and deeper hole. and a fourth step of finishing the inside of the deep hole after drawing using a two-stage finishing knockout bin.

The present invention will be explained below with reference to an embodiment shown in the drawings.

FIGS. 1 to 5 are explanatory diagrams of only the shaft material 1, showing the state of the shaft material 1 in which a deep hole is drilled by the method of the present invention and is processed in each step of the present invention.

That is, in these figures, according to the present invention, the shaft material 3-1, which has not yet been formed with a hole as shown in FIG. A dent 2 can be added. Next, as shown in FIG. 3, in a second step, a deep hole 3 is formed in the recess 20 using a two-stage knockout bottle, which will be described later. next,
As shown in FIG. 4, in the third culm, the peripheral portion 4 of the deep hole 3 is drawn as shown by the arrow, thereby forming the deep hole 3 with a smaller diameter and deeper depth. Finally, as shown in FIG. 5, in the fourth step, the deep hole 5 is finished by a two-stage finishing knockout bin, which will be described later.
is formed. Note that the processing state of the head of the shaft material 1 is arbitrary.

To explain the details of the method of the present invention for processing the shaft material 1 as described above, first, FIG. 6 is a longitudinal sectional view of the first knockout device 10 showing the first step of the present invention.

In FIG. 6, the shaft material 1 is the first knockout device]0
A pressing device 12, which is usually a part of a press device, is applied to one end (upper end) of the material 1, and the other end surface 4- (lower end surface) of the material 1 is inserted into the first die case 11 of The tip of the knockout bin 13 is applied, and the pressing force of these pressing devices 12 and the first knockout bin 13 forms a recess 2 in the lower end surface of the material 1. Incidentally, in the first step, since only the recess 2 is formed, the first knockout device 10 can be of the same construction as the conventional one.

7-8 show the second step of the present invention.

In this step, the above-mentioned material with the recess 2
It is inserted into the second tie case 21 of the knockout device 20, and the pressing device 22, which is a part of the press device, is applied to the upper end of the material 1, and the second The tip of the knockout bin 23 is applied.

As shown in detail in FIGS. 9 and 10, the second die case has a dining 24 made of a superhard material that comes into direct contact with the shaft material 1, and has lubricating oil supply holes 25 formed at desired locations. The bottom part has a die liner 26 as shown in Figures 7 and 8.
placed on top. A bottle knockout roller 27 is inserted into the die liner 26.

On the other hand, the second knockout bin 23 has a bin liner 2 with a hole removably fitted in the second die case 21.
8 (see Figures 11 and 12) and holes are bottle holder 2.
9 (see Figure 13.14), and the tip is the material 1.
A plurality of (three in this embodiment) finger portions 3 facing the lower end surface of
The hole located between the die knockout bottle 31 (see Fig. 15.16) with a 0- I'm trying to configure it.

As shown in FIGS. 7 and 8, the bin liner 28 is fitted into the hole 33 of the second die case 21 and placed on the die liner 26. Further, the perforated bottle holder 29 is placed on the perforated Kevin liner 28'' within the hole 33, and is located directly below the dining 24 of the second die case 21.

Furthermore, in the die knockout bin 31 of the second knockout bin 23, each finger 30 has a plurality of small holes 34 (Figs. 11 and 12) 2 in the bin liner 28, and the holes in the bin holder 29 It extends vertically movably through a plurality of small holes 35 (FIG. 13) and reaches inside the dining 24 of the second die case 21.

Furthermore, the perforated bottle 32 has a flange portion 36 at the bottom as shown in FIGS. A notch 37 is formed. Further, the perforated bottle 32 has a bottom portion placed and supported on the perforated bottle liner 28, a side portion supported by the perforated bottle holder 29, and a tip portion placed on the die knockout bin 32.
The dining 24 of the second die case 21 extends beyond the tip of the
reaching within. Of course, the bottle 32 is removable as well.

As mentioned above, in the second step shown in FIG.
2, a deep hole 3 is formed.

In this case, the punching bin 32 is supported by the bin liner 7-28 to make a deep hole 3, and the tip of the die knockout bin 31 serves as a stopper for the material 1. Therefore, the hole is the bottle liner 28 and the hole is the bottle 32.
By replacing the die knockout bin 31 with one of different dimensions, the depth of the deep hole 3 can be easily changed without changing the die knockout bin 31. In addition, die knockout bin 3
1 mainly serves to extrude and discharge the product, that is, the raw material 1.

FIG. 19 is a longitudinal sectional view of the third knockout device 50 for explaining the third step of the present invention.

In this process, a material 1 with a deep hole 3 drilled therein is inserted into a third die case 51 for drawing, and a pressing bag @ 52, which is usually part of a press device, is placed on the upper end of the material 1. The flat tip of the third knockout bin 53 is applied to the lower end surface.

In this case, due to the pressing force of the suppressor 52 and the third knockout bin 53, the material 1 cannot be drawn according to the shape of the third die case 51, and the diameter of the deep hole 3 becomes smaller and the depth becomes deeper. It gets deeper.

8- In the case of this step, since the material 1 is only subjected to drawing processing, there is no need to particularly consider the load etc. of the third knockout device 5o, and a device having the same structure as the conventional one can be used.

FIG. 20 is a longitudinal sectional view of a fourth knockout device 60 according to the fourth culm of the present invention.

The fourth knockout device 60 has the same structure as the second knockout device 20 in the second step (FIG. 7), and only the dimensions and shape of the tip of the knockout bin are changed.

In this fourth culm, material 1 after drawing is
The material 1 is inserted into a die case 61, and the upper end of the material 1 is applied with a pressing device 62, which is usually a part of a press device, and the lower end surface is applied with the tip of a fourth knockout bin 63.

Here, the fourth die case 61 is connected to the second die case 2.
As in the case of 1, it has a dining 64.
A finishing bin liner 65 and a finishing bin holder 66 are removably arranged in the lower hole. The finishing bottle liner 65 is the same as the bottle liner 28 in which the holes are drilled in the second step.
The finishing bottle holder 66 corresponds to the perforated Kepin Holter 29. Therefore, the fourth die case 61 and the finishing bin liner 65 are the same as the die liner 67.
A knock-out rondro 8 is inserted into the die liner 67, which is placed and supported on top of the die liner 67.

Also, the finishing bin holder 66 is the finishing bin liner 6.
It is located on 5.

On the other hand, the fourth knockout pin 63 passes through the finishing bin liner 65 and the finishing bin holder 66, and is inserted into the dining 64 of the fourth die case 61 so that its tip faces the lower end surface of the material 1. A die knockout bin 70 having a plurality of fingers 69 is removably positioned between the fingers 69 of the die knockout bin 70, the bottom part is placed and supported on the finishing bin liner 65, and the side part is a finishing part. - A finishing bottle 71 supported by a finishing bottle holder 66 and whose tip is inserted into a deep hole 3 in the lower end surface of the material 1
It is structured in two stages.

In this case, the die knockout bin 70 may have a second process, and the die knockout bin 71 has the same configuration as the bottle 32 in that the base has the same structure as the second process hole, but the size and shape of the tip part have been changed to be elongated. Only.

In this step, the finishing bottle 7 is inserted into the deep hole 3 of the material 1 by the pressing force of the pressing device 62, and finishing is performed. Further, the knockout bin 71 serves as a stopper for the lower end of the material 1. In this case as well, it is extremely easy to replace the finishing bottle 71 in conjunction with the replacement of the bottle 32 in the second step of drilling.

As explained above, according to the present invention, in the second and fourth steps of machining a deep hole in the material, the knockout bin has a two-stage structure, so that the first stage die knockout bin has a short and constant size. Even if you leave it as is, you can drill a deep hole to the desired depth by simply replacing the second-stage hole or finishing bottle.

In this way, since the first stage die knockout bin can be short, the structure of the knockout device is simple, and since it can be operated at full capacity, the drilling depth is not limited. That is, the first-stage die knockout bin can perform the same operation as in the first and third steps without drilling.

In addition, since the knockout bin has a two-stage configuration, only partial replacement is required in the event of damage, making the work easier.

Therefore, a knockout device with a simple structure can be used, and a punching method is provided that facilitates replacement of the die knockout bin.

[Brief explanation of drawings]

Figures 1 to 5 are partial cross-sectional front views of the shaft material as it has been processed in each step of the method of the present invention, and Figure 6 is a longitudinal cross-section of the first knockout device showing the first step of the present invention. 7 is a vertical sectional view of the second knockout device also showing the second step, FIG. 8 is a detailed view of the main part of FIG. 7, and FIG. 9 is an enlarged plan view of the second gouging case in FIG. 8. , Fig. 10 is a sectional view from X->11 in Fig. 9, Fig. 11 is a plan view of the bin liner with holes in Fig. 8, and Fig. 12 is a cross-sectional view from X->11 in Fig. 11.
M sectional view, Fig. 13 is a plan view of the pinhole 12-ruder in Fig. 8, and Fig. 14 is a plan view of the pinhole 12-ruder in Fig. 13.
15 is a cross-sectional view of the die knockout bin of FIG. 8, and a cross-sectional view of the die knockout bin of FIG.
Fig. 6 is an enlarged front view of the die knockout bottle shown in Fig. 8, Fig. 17 is an enlarged front view of the bottle with holes in Fig. 8, Fig. 18 is a bottom view of Fig. 17, and Fig. 19 is an enlarged front view of the die knockout bottle of the present invention. FIG. 20 is a longitudinal sectional view of the third knockout device showing the third step, and FIG. 20 is a longitudinal sectional view of the fourth knockout device showing the fourth culm. [Explanation of symbols] 1... Shaft material 2... Recess 3... Deep hole 5... Finishing deep hole 10... First knockout device 11... First die case 12... Pressing Device 13...First knockout bin 2
0...Second knockout device 21...Second die case 22...Press device 23...
...Second knock-out bin 28...The hole is drilled in the bottle liner 29...The hole is drilled in the bottle holder 30...Finger part 31...The knockout bottle 32...The hole is drilled in the bottle 50...
Third knockout device 51...Third die case 52
...Press device 53...Third knockout bin 60...Fourth knockout device 61...Fourth die case 62...Press device 63...
...Fourth knockout bin 65...Finishing bin liner 66...Finishing bin holder 69...Finger portion 70...Gui knockout bin 71...Finishing pin. Patent Applicant Togra Co., Ltd. Agent Patent Attorney Mitsuo Narushima Figure 1 Figure 2
Figure 3 Figure 6 015
- Fig. 6 Fig. 7 → -22: Fig. 8 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 19 Fig. 20 Fig. 2

Claims (1)

[Claims] A long shaft material is inserted into a first gouging case, a pressing device is applied to one end of the material, and the tip of a first knock-out bin is applied to the other end surface of the material to make a dent in the other end surface of the material. 1st to attach
Step: Insert the above material with a dent into the second goo case,
A pressing device is applied to one end of the same material, and a perforated bottle liner and a perforated hole are removably fitted into the second goo case, and the perforated pin passes through the bottle holder, and a plurality of fingers whose tips face the other end surface of the material The knockout bottle is located between a knockout bottle having a hole and a finger of the knockout bottle, the hole at the bottom is supported by a bottle liner, the hole at the side is supported by a bottle holder, and the tip is supported by a bottle holder. The hole drill that comes into contact with the recess on the other end of the material is made of a bottle.The hole drill of the second knockout bin is made by applying the tip of the bottle to the recess on the other end of the material to form a deeper hole in the recess of the same material. In the second step, the material with the deep hole formed therein is inserted into the third die case for drawing processing, a suppression device is applied to one end of the material, and a flat part of the third knockout bin is placed on the other end side. The third process involves drawing the area around the deep hole in the same material by placing the tips facing each other and applying pressure to both ends of the material to form a smaller diameter and deeper hole. Insert the formed raw material into the fourth die case, apply a pressing device to one end of the material, and insert the finished bin liner and finisher, which are removably fitted into the fourth tie case, into the bin holder. A knockout pin is located between the fingers of the knockout bin and the knockout pin having a plurality of fingers that penetrate through the material and whose tips face the other end surface of the material, the bottom part of which is supported by the finishing bin liner, and the side part of which is supported by the finishing bin liner. Finishing is carried out by placing the tip of the finishing bottle of the fourth knockout bin, which is supported by a bin halter and further comprising a finishing bottle whose tip is inserted into a deep hole on the other end of the material, into the deep hole on the other end of the material. Method 0 of drilling a deep hole in a long shaft equipped with a fourth culm for finishing the inside of the hole