JPH0558841B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method and apparatus for cutting bar materials such as round bars using a fixed blade and a movable blade. [Prior art] Fig. 4 shows a conventional example, in which the round bar 31 is a fixed blade 32.
At the same time, the tip 31A of the round bar 31 is inserted into the hole 33A of the movable blade 33, and a stopper 34 whose end face is held by a stopper holding member 35 comes into contact with the tip 31A. Movable blade 33
When the movable blade 33 is lowered relative to the fixed blade 32 by applying a downward force from the punch to the upper surface of the round bar 31, the tip 31A of the round bar 31 is cut by shearing force. [Problems to be Solved by the Invention] According to the above-described prior art, an axial thrust force is applied to the round bar 31, and the stopper 34 receives this thrust force while cutting the tip 31A. When the tip 31A descends together with the movable blade 33, rubbing occurs between the end surface of the tip 31A and the stopper 34, which tends to cause seizure. Further, when the tip 31A is pushed down by the movable blade 33, due to the gap between the tip 31A and the hole 33A of the movable blade 33 and the deformation due to the tip 31A being soaked,
The tip 31A is rotationally displaced within the hole 33A as shown by the arrow, which causes a problem in that the cutting accuracy of the cut surface is reduced. Tip part 3 like this
The amount of rotational displacement of 1A increases as the length (cutting length) of the tip portion 31A becomes smaller. For example, when this length becomes smaller than the diameter of the round bar 31, the cutting accuracy decreases significantly. SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for cutting a bar material that can solve the problems of the prior art described above, prevent the occurrence of seizure, and improve cutting accuracy. [Means for solving the problem] For this reason, the method according to the present invention involves inserting a bar such as a round bar into a fixed blade, and inserting the tip of this bar into a movable blade. In this method, the stopper is brought into contact with the end face of the tip and the movable blade is moved directly in the axial direction of the bar to cut the tip from the bar, in which the stopper is moved together with the movable blade during cutting. This is how it was done. Furthermore, the device according to the present invention includes a fixed blade into which a bar is inserted, a movable blade into which the tip of the bar is inserted and which is movable in a direction perpendicular to the axial direction of the bar, and a movable blade into which a bar is inserted. A cutting device comprising a stopper that abuts the end surface of the tip, a guide body that is coupled to a movable blade holding member that holds a movable blade and has a guide surface parallel to a moving direction of the movable blade, and a guide body that holds the stopper; In addition, it is movable along the guide surface of the guide body, is biased in the same direction as the cutting direction by the movable blade, and stops at a certain position where the bar and the stopper match, and is integrated with the movable blade during cutting. The stopper holding member is provided with a movable stopper holding member, and a stopper stopping member which is fixedly arranged opposite to the stopper holding member and which is brought into contact with the cut stopper holding member to prevent movement of the stopper. [Function] In the method according to the present invention, the stopper moves together with the movable blade, so the tip of the bar is cut without any deviation in position between the tip and the stopper. Therefore, seizing due to friction between the tip and the stopper is prevented, and since the tip is cut with the stopper always in contact with the entire end surface of the tip, rotational displacement of the tip is prevented. be done. In the device according to the present invention, when the movable blade moves, the movable blade holding member, the guide body, and the stopper holding member move together with the movable blade, so that the stopper moves together with the movable blade during cutting. After cutting, the stopper holding member comes into contact with the stopper stopping member, which prevents further movement of the stopper, and the stopper stops against the still moving movable blade, thereby preventing the tip cut from the bar material. The part and stopper are separated and the tip is ejected from the device. [Embodiment] FIGS. 1A, B, and C are cross-sectional views showing the method and apparatus according to the present embodiment in the order of their operation. This device is applied to a press machine, and a fixed blade holding member 3 that holds a fixed blade 2 horizontally is fixed to a base member 1. The movable blade 4 is held by a movable blade holding member 5, and a pressure receiving member 6 is provided above the movable blade 4.
will be permanently installed. This pressure receiving member 6 is for receiving the downward force of a punch 8 attached to a slide 7 of a press machine shown in FIG. 1B. A pressure receiving member 9 is also fixed to the lower part of the movable blade holding member 5, and a cushion pin 10 that passes through the hole 1A of the base member 1 and is constantly applied with an upward pressing force by an air cylinder or the like is attached to the pressure receiving member 9. come into contact with The fixed blade 2 has a hole 2A formed horizontally through which the round bar 11 is inserted, and the movable blade 4 has a hole 2A formed horizontally through which the round bar 11 is inserted.
A hole 4A into which A is inserted is formed. The movable blade 4 is provided with a space 4B that communicates with the hole 4A, and this space 4B reaches the top surface of the movable blade 4 as well as the back surface of the movable blade 4. A guide body 14 is disposed on the back side of the movable blade 4, and the guide body 14 is connected to the movable blade holding member 5 by a connecting member (not shown), and moves up and down together with the movable blade 4 and the movable blade holding member 5. Guide body 14
consists of a front member 15, a rear member 16, a lid member 17, and a bottom member 18. As shown in FIG. 2, the front member 15 has a concave cross section, and the inner surfaces of the front member 15 and the rear member 16 form vertical guide surfaces 15A, 15C, 15D, and 16A parallel to the moving direction of the movable blade 4. Furthermore, the front member 15 is provided with an opening 15B that communicates with the space 4B of the movable blade 4. A stopper holding member 20 that holds the base of the stopper 19 extending in the horizontal direction is arranged between the front member 15 and the rear member 16.
0 is movable along the guide surfaces 15A, 15C, 15D, and 16A, and is positioned by the front member 15 and the rear member 16 in the front-back direction and the left-right direction. The stopper 19 is inserted into the space 4B through the opening 15B. As shown in FIG. 1, a spring 21, which is a biasing member, is interposed between the stopper holding member 20 and the lid member 17, and the elastic force of this spring 21 always biases the stopper 19 and the stopper holding member 20 downward. As shown in FIG. 3, the top surface 18B of the bottom member 18 and the bottom surface 20A of the stopper holding member 20 are brought into contact with each other, so that the stopper holding member 20 is moved between the tip 11A of the bar 11 and the stopper 19 with respect to the guide body 14. It is designed to stop at a certain position where the two match. As shown in FIG. 1, a support 22 is erected on the base member 1, and a stopper stop member 23 is fixedly installed at the top of the support 22. This stopper stop member 23 connects the front member 15 and the rear member 1 through the hole 18A of the bottom member 18.
6, and is vertically opposed to the stopper holding member 20. Next, we will discuss the effect. When the slide 7 is stopped at the top dead center as shown in FIG.
The stopper 19 is brought into contact with the end surface of the tip 11A. This completes the setting of the round bar 11. When the punch 8 descends with the slide 7 as shown in FIG. As a result, the tip 11A of the round bar 11 is cut by the shearing force between the fixed blade 2 and the movable blade 4. During this cutting, the guide body 14 coupled to the movable blade holding member 5 moves down together with the movable blade 4, and as described above, is biased downward by the spring 21 and moves toward the movable blade holding member 5 and the guide body 14. On the other hand, the stopper holding member 20 and the stopper 19, which are stopped at a fixed position, also descend together with the movable blade 4. By lowering the stopper 19 together with the movable blade 4 in this manner, when the tip 11A is cut from the round bar 11, the stopper 19 is always in contact with the entire end surface of the tip 11A. Therefore, even if an axial thrust force is applied to the round bar 11, no seizure due to friction will occur between the tip 11A and the stopper 19. Also, the tip 11
The stopper 19 prevents the rotational displacement of the tip A within the hole 4A of the movable blade 4, and therefore, even if the length of the tip 11A is small, the tip 1 cut into a chip shape
The cutting accuracy of 1A is high precision. When the tip 11A is cut from the round bar 11 as described above, the lower surface of the stopper holding member 20 is in contact with the stopper stopping member 23, as shown in FIG. 1B. Thereafter, as shown in FIG. 1C, the slide 7 further descends to the bottom dead center, and accordingly, the movable blade 4, the movable blade holding member 5, and the guide body 14 also further descend. On the other hand, since the stopper holding member 20 is in contact with the stopper stopping member 23, the stopper holding member 20 cannot be lowered any further.
0 maintains the height position of FIG. 1B, and these 19,
20 indicates guide surfaces 15A, 15C, 15D, 16A of the front member 15 and rear member 16 relative to the guide body 14, etc.
The spring 21 rises relatively while being guided by the spring 21.
is compressed. In this way, the stopper 19 is relatively raised, and the stopper 19 is placed above the space 4B and the opening 15B.
9 reaches, the stopper 19 is moved to the round bar 11.
is separated from the end face of the cut tip 11A. Thereafter, the tip portion 11A is discharged to the outside of the device by the discharge pin 24. As described above, the tip portion 11A by the ejection pin 24
The stopper 19 is forcibly separated from the tip 11A when the tip 11A is ejected, and as described above, even if an axial thrust force is applied to the round bar 11 when cutting the tip 11A, the tip 11A remains after cutting. Because the stopper 19 is not in close contact with the
You can definitely do it. If slide 7 is raised, cushion pin 10
Due to the pressing action of the movable blade 4, the movable blade holding member 5,
The guide body 14 rises, and after the lower surface 20A of the stopper holding member 20 comes into contact with the upper surface 18B of the bottom member 18 due to the urging force of the spring 21, the stopper 19 and the stopper holding member 20 also move the movable blade 4 and the movable blade holding member 5. , rises together with the guide body 14 and returns to the state shown in FIG. 1A. Thereafter, preparation for the next cutting operation is completed by pushing out the round bar 11 and bringing its tip end into contact with the stopper 19, and by lowering the slide 7, the cutting operation is repeated in the same manner as described above. The following table shows the experimental results when a round bar was cut according to the embodiment of the present invention described above and when it was cut according to the conventional example shown in FIG. The details of the roundness, uneven thickness, and inclination of the cut surface in this table are shown in FIG.

〔Effect of the invention〕

According to the present invention, when the stopper is brought into contact with the end face of the tip of a bar inserted into the movable blade and the movable blade is moved to cut this tip from the bar, the stopper is integrally attached to the movable blade. Since the bar is moved, the bar can be cut without burning, and the cutting accuracy is improved. In particular, even if the cutting length is small, the bar can be cut with high precision. Further, according to the present invention, after the bar is cut into the tip, the movable blade is further moved, and
Since the stopper is stopped, even if an axial thrust force is applied to the bar during cutting,
After cutting, the tip will not come into close contact with the stopper,
Since the tip is separated from the stopper, the tip can be easily and reliably discharged from inside the movable blade.

[Brief explanation of the drawing]

1A, B, and C are cross-sectional views showing the method and apparatus according to the embodiment in the order of their operation; FIG. 2 is a cross-sectional view taken along the line -- of FIG.
FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a diagram illustrating the contents of each cutting accuracy. 2...Fixed blade, 3...Fixed blade holding member, 4...
Movable blade, 5...Movable blade holding member, 7...Slide, 8...Punch, 11...Round bar as bar material, 1
1A... tip, 14... guide body, 15A, 15
C, 15D, 16A... Guide surface, 19... Stopper, 20... Stopper holding member, 21... Spring serving as biasing member, 23... Stopper stopping member.

Claims (1)

[Scope of Claims] 1. Insert the tip of the bar inserted into the fixed blade into the movable blade, bring a stopper into contact with the end face of the tip, and move the movable blade in the axial direction of the bar. In the method of cutting the tip from a bar by moving the tip in a direction perpendicular to the bar, the stopper is moved together with the movable blade during cutting, and after cutting the tip from the bar, the movable blade A method for cutting a bar material, characterized in that the stopper is moved and the stopper is stopped to separate the stopper and the tip. 2. A fixed blade into which a bar is inserted, a movable blade into which the tip of the bar is inserted and movable in a direction perpendicular to the axial direction of the bar, and a movable blade into which the tip of the bar is inserted, and A bar cutting device comprising a stopper that abuts the movable blade, and a guide body that is coupled to the movable blade holding member that holds the movable blade and has a guide surface that is parallel to the moving direction of the movable blade; It is movable along the guide surface of the guide body, is biased in the same direction as the cutting direction by the movable blade, stops at a certain position where the bar material and the stopper coincide, and is integrated with the movable blade during cutting. A bar member comprising: a stopper holding member that moves to the stopper; and a stopper stopping member that is fixedly arranged opposite to the stopper holding member and that the stopper holding member after cutting comes into contact with and prevents the stopper from moving. cutting equipment.