JPH10323800A - Pressing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the processing machine which prevents, in advance, the occurrence of the inferior goods in a large scale by faithfully detecting the variations in pressure at the time a crimp contact is crushed, and by identifying at the same time a poor pressure contact to the electric wire caused by the change in pressure. SOLUTION: The pressing machine comprises a guide part 3 supported to move up and down freely, a driving system which moves the guide part 3 vertically, a workbench 6, on the upper side of which an anvil 6a is formed, an applicator 4 which is placed at the bottom of the guide part 3, and a pressure sensor 5 which is positioned between the applicator 4 and the guide part 3 and detects the pressure change. The applicator 4 also conducts the crushing operation for the crimp contact set between the applicator 4 and the anvil 6a. The crimping condition of the crimp contact to the electric wire is judged by analyzing the changes of pressure to be detected by the pressure sensor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press, and more particularly, to a press used for a crimp terminal crimping device or the like.

[0002]

2. Description of the Related Art Conventionally, a press machine used in a crimp terminal crimping apparatus or the like has been designed so that crimp terminals are continuously fed into an anvil in accordance with the vertical movement of an applicator. It is crushed and replaced with a new crimp terminal each time crushing is completed.

[0003] As described above, a plurality of crimp terminals are successively crushed one after another. However, as the number of times of crushing work increases, the tip of the applicator is worn, and sometimes the tip of the applicator is chipped for some reason. There is also. If the tip of the applicator is worn or chipped beyond a certain length,
The crimp terminal cannot be sufficiently crushed. In addition, when removing the covering material of the electric wire, a part of the conductor to which the crimp terminal is to be crimped is cut off, and the bonding force after crimping the crimp terminal may not be sufficient. Furthermore, if the covering material is left uncovered in the wire to which the crimp terminal is crimped, a part of the covering material is crimped to the crimp terminal together with the inner conductor, and the crushed portion of the crimp terminal 26 may be distorted. .

[0004] Such crushing failure of the crimp terminal is periodically examined every time the crush of a predetermined number of crimp terminals is completed. If a crimping terminal with poor crushing is found in a certain lot of crimping terminals, the cause is investigated and eliminated. However, among the crimp terminals belonging to the lot in which the crimp terminal with the crush failure is found, all of the crimp terminals that have been crushed after the occurrence of the crimp failure may have a crush failure, and a large number of defective products are produced.

[0005] In order to detect such a crushing failure of the crimp terminal immediately after the occurrence of the failure and to prevent a large number of defective products from being produced in advance, a press machine as shown in FIGS. 9 and 10 has been devised. I have. FIG. 9 is an explanatory view showing the operation of a press having a pressure sensor immediately below the anvil, and FIG. 10 is an explanatory view showing the operation of a press having a pressure sensor immediately below the anvil following FIG.

A press 21 shown in FIGS. 9 and 10 crushes an applicator 24 movably supported in a vertical direction and a crimp terminal 26 by an anvil 25 a formed in a concave shape on a work table 25. And the anvil 25a
, A pressure sensor 27 composed of a piezo element is provided.

The applicator 24 is fixed to the lower end of a vertically moving guide member 23, and moves up and down integrally with the guide member 23. The guide member 23 is supported on both sides in the lateral width direction by the support member 22 and is movable only in the vertical direction. The guide member 23 moves up and down by a power mechanism (not shown). An applicator 24 is disposed at the lower end of the vertically moving guide member 23 so as to face downward, and crushes the crimp terminal 26 between the lower end of the applicator 24 and the anvil 25a.

[0008] In other words, as shown in FIG. 9, the anvil 25 a
When the applicator 24 moves to the lower starting point as shown by an arrow 24a, the crimp terminal 2 is inserted.
6 is crushed as shown in FIG.

[0009] A pressure sensor 27 is interposed just below the anvil 25a in the work table 25 of the anvil 25a. Therefore, the pressure sensor 27 is pressed as the crimp terminal 26 is crushed and outputs a voltage change. Pressure sensor 27
Changes in accordance with the pressing force received by the pressure sensor 27.

Assuming that a change in the voltage output of the pressure sensor 27 is a change in pressure received by the crimp terminal 26,
It is determined whether or not the crushed state is appropriate.

[0011]

However, as described above, the pressing force received by the crimp terminal 26 from the applicator 24 is transmitted to the pressure sensor 27 via the work table 25, Since the area is too large compared to the area occupied by the crimp terminal 26 on the upper surface of the worktable 25, the pressing force received by the crimp terminal 26 was dispersed.

Therefore, the pressure sensor 27 may not be able to detect the change in the pressing force received by the crimping terminal 26 with sufficient sensitivity to determine whether or not the crushing failure has occurred. Therefore, providing the pressure sensor 27 immediately below the anvil 25a was not enough to prevent the crimping terminal 26 from being defectively crimped to the electric wire.

Accordingly, the present invention is to more accurately detect a change in pressure applied to a crimp terminal during crushing, and simultaneously determine the occurrence of a crimping failure of the crimp terminal to an electric wire based on the pressure change, thereby preventing the occurrence of a large number of defective products. It is an object of the present invention to provide a press machine that can prevent the occurrence of a press.

[0014]

A press according to the present invention comprises a guide member supported to move up and down, a power mechanism for moving the guide member up and down, and a work table having an anvil formed on an upper surface. An applicator positioned at a lower end of the guide member and performing a crushing operation between a pressed part on the anvil of the worktable and the anvil of the worktable; and an applicator between the applicator and the guide member. And a pressure sensor for detecting a pressure change.

Here, the pressure sensor includes a piezo element, but any other element such as a piezoelectric ceramic may be used as long as it can detect a change in pressure. In addition, a cylinder or the like may be used as the power mechanism for moving the guide member up and down, in addition to the mechanism using the rotation of the crankshaft.

Therefore, according to the press of the present invention,
When the crimp terminal is crushed between the anvil and the applicator, the pressure applied to the applicator substantially equal to the pressure received by the crimp terminal is faithfully transmitted to the pressure sensor without being absorbed by other members or the like.

[0017]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a press according to an embodiment of the present invention.

As shown in FIG. 1, a press 1 according to the present embodiment has an applicator 4 movably supported in a vertical direction.
And crushing the crimp terminal with the anvil 6a formed in the worktable 6 in a concave shape.

The applicator 4 is made of a metal, and has a lower end in the shape of an overlapping portion of two overlapping circles having the same radius and different center positions when viewed from one side, with the center sharpened downward. It has become. Applicator 4
It is fixed to the lower end of the guide member 3 supported so as to be able to move up and down, and moves up and down integrally with the guide member 3.

The guide member 3 is supported on both sides in the width direction by a support member 2 made of metal and fixed to the main body so as to be immovable, and can be moved only in the vertical direction. The guide member 3 is moved up and down by a power mechanism that rotates the crankshaft 8 by an electric motor 9.

At the approximate center of the guide member 3, an elongated guide hole 3a extending in the width direction of the worktable 6 is formed. A sliding member 7 made of a metal having a longitudinal width substantially equal to that of the guide hole 3a is fitted into the guide hole 3a, and the sliding member 7 can move in the guide hole 3a in the longitudinal direction in parallel. . The sliding member 7 has an electric motor 9 substantially at the center.
Is rotatably supported by a circularly moving end of a crankshaft 8 directly connected to the drive shaft.

The crankshaft 8 has a main shaft 8a having one end directly connected to the drive shaft of the electric motor 9, an orthogonal shaft 8b having one end suspended from the other end of the main shaft 8a, and a perpendicular shaft 8b suspended from the other end of the orthogonal shaft 8b. An operating shaft 8c is substantially parallel to the main shaft 8a, and has a crank shape as a whole. Therefore, when the main shaft 8a rotates, the end of the working shaft 8c makes a circular motion, and since the end of the working shaft 8c is supported at substantially the center of the sliding member 7, the sliding member 7 Make a circular motion by rotation.

The guide member 3 moves up and down due to the vertical component of the circular movement of the sliding member 7, and the applicator 4 projecting downward from the lower end of the guide member 3 also moves up and down. At this time, the sliding member 7 itself reciprocates in the guide hole 3a in the longitudinal direction due to the horizontal component of the circular movement of the sliding member 7.

As described above, the applicator 4 is disposed downward at the lower end of the guide member 3 which moves up and down, and crushes the crimp terminal between the lower end of the applicator 4 and the anvil 6a. .

Next, the crushing operation of the crimp terminal 10 by the press machine 1 will be described. FIG. 2 is an explanatory view showing the operation of the press machine according to one embodiment of the present invention, and FIG. 3 is an explanatory view showing the operation of the press machine according to one embodiment of the present invention following FIG.

As shown in FIG. 2, the crimp terminal 10 is interposed in the anvil 6a with the applicator 4 at the upper starting point of the vertical movement. When the crimp terminal 10 is interposed in the anvil 6a, the applicator 4 moves to the lower starting point as shown by an arrow 4a, and the crimp terminal 10 is crushed as shown in FIG. When the crimp terminal 10 is crushed, the applicator 4 moves upward again and the crimp terminal 10 is opened, but when the applicator 4 continues to descend, the crimp terminal 1
0 is exchanged for another crimp terminal. Such a series of steps is continued, and the crimp terminal 10 is crushed one after another.

A pressure sensor 5 composed of a piezo element is interposed between the applicator 4 and the guide member 3. The pressure sensor 5 can accurately detect the pressing force received by the applicator 4.

Further, when the crimp terminal 10 is crushed,
The pressing force received by 0 is substantially equal in magnitude to the pressing force received by the applicator 4 only in a direction opposite to that of the pressing force. Therefore, the change in the pressing force detected by the pressure sensor 5 is the change in the pressing force received by the crimp terminal 10, and the tip of the applicator 4 is worn as shown by a broken line in FIG. As shown in FIG. 4 (b), it is possible to early detect a crimping failure to the end of the electric wire which occurs when the wire is chipped, and it is possible to prevent mass production of defective products. FIGS. 4A and 4B are explanatory diagrams showing wear of the applicator of the press machine according to one embodiment of the present invention.

Here, a change in the pressing force detected by the pressure sensor 5 will be described. FIG. 5A is an explanatory diagram showing a temporal change of the vertical displacement of the applicator of the press machine according to one embodiment of the present invention, and FIG. 5B is an applicator of the press machine according to one embodiment of the present invention. FIG. 5 is an explanatory diagram showing a temporal change of a pressure applied to a vehicle.

In FIG. 5A, the horizontal axis represents time T and the vertical axis represents the vertical displacement H of the applicator 4, and the temporal change in the vertical displacement of the applicator 4 draws a substantially sinusoidal wave. . The point a of the sine wave that is convex downward is the lower starting point of the vertical movement of the applicator 4, and just before the point a, the tip of the applicator 4 starts to contact the crimp terminal 10. The crimp terminal 10 is crushed between the applicator 4 and the anvil 6a in a range from the point where the tip starts to contact the crimp terminal 10 to the point a.

As described above, the pressing force detected by the pressure sensor 5 occurs immediately before the point a in the section where the crimp terminal 10 is crushed, as shown by the waveform 11 in FIG. 5B. The horizontal axis represents time T, and the vertical axis represents pressing force P detected by the pressure sensor 5. The magnitude of the pressing force P decreases as the distance from the point a increases, and reaches a maximum at the position of the point a. The waveform 11 has a mountain shape and is generated periodically in accordance with the vertical movement of the applicator 4, and the amplitude of each waveform is substantially constant.

However, as the tip of the applicator 4 wears as shown in FIG. 4A, the amplitude of the waveform 11 decreases as shown by the waveform 12. In particular, when the tip of the applicator 4 is cut off as shown in FIG.
The amplitude of 1 is even smaller, as shown in waveform 13.

The crimp terminal 10 is crushed by the pressing force corresponding to the peak value of the waveform 11 as described above. When the range of the peak value of the waveform 11 deviates from the allowable range of the pressing force that is the condition for crushing the crimp terminal 10, the crushing operation of the crimp terminal 10 is stopped.

When the entire length of the applicator 4 is shortened due to wear or breakage of the distal end of the applicator 4, the distance between the distal end of the applicator 4 and the anvil 6a when the applicator 4 reaches the lower starting point is sufficient. In order not to be shortened to
The crimp terminal 10 cannot be sufficiently crushed. Therefore, not only is the bonding force between the crimp terminal 10 crimped to the wire end and the wire not sufficiently obtained, but also the contact resistance between the crimp terminal 10 and the wire does not fall below the reference value. The crimp terminal 10 that is not crushed by the pressing force within the allowable range becomes a defective product, and when the applicator 4 is worn and damaged, all the crimp terminals 10 that are crushed thereafter become defective products. In order to prevent such defective products from being produced, the crushing operation of the crimp terminal 10 is performed when the range of the peak value of the waveform 11 deviates from the allowable range of the pressing force which is the crush condition of the crimp terminal 10. To stop.

However, when the range of the peak value of the waveform 11 deviates from the allowable range of the pressing force, which is a condition for crushing the crimp terminal 10, it is not always the case that the tip of the applicator 4 is worn.

In the proper electric wire 14 shown in FIG. 6, the conducting wire 16 is located substantially at the center of the covering material 15, and the covering material removing mechanism (not shown) changes the state from (a) to (b).
The end covering material 15 is removed without damaging the conductor 16. FIG. 6 is an explanatory view showing a state where the covering material of the electric wire is normally removed.

However, in the defective electric wire 17 shown in FIG. 7, the conducting wire 19 is eccentric from the center of the covering material 18, and when the covering material 18 is removed by a covering material removing mechanism (not shown), a part of the conducting wire 19 is removed. It is removed together with the coating material 18. FIG. 7 is an explanatory view showing a state in which a part of the conductive wire is cut when the covering material of the electric wire is removed.

When an appropriate electric wire 14 is used, as shown in FIG. 8A, when the crimp terminal 10 is crushed while the conductor 16 exposed from the end is inserted through the crimp terminal 10,
When the distance between the lower end of the applicator 4 and the anvil 6a at the lowest point of the applicator 4 is a predetermined condition, the conductor 1
6 fills the internal space of the crimp terminal 10 and the crimp terminal 1
0 close to the inner surface. Therefore, the bonding strength between the electric wire 14 and the crimp terminal 10 can obtain a predetermined strength.
The contact resistance between the terminal 4 and the crimp terminal 10 is sufficiently small that it can be used in various machines. FIG. 8A is an explanatory view showing a state in which a crimp terminal is crimped to an electric wire from which a covering material has been normally removed, and FIG. 8B is an electric wire in which a part of a conductive wire is cut when the covering material is removed. FIG. 4 is an explanatory view showing a state in which a crimp terminal is crimped on the terminal.

However, when the defective electric wire 17 is used,
As shown in FIG. 8B, the conductive wire 19 exposed from the end portion
When the crimp terminal 10 is crushed while the crimp terminal 10 is inserted through the crimp terminal 10, the distance between the lower end of the applicator 4 and the anvil 6a at the lowest point of the applicator 4 is the same as that when the electric wire 14 is used. Cannot fill the internal space of the crimp terminal 10. Therefore, a cavity 10 a is formed in the crimp terminal 10, and the conductive wire 19 does not sufficiently adhere to the inner surface of the crimp terminal 10. As a result, the bonding strength between the electric wire 17 and the crimp terminal 10 cannot obtain a predetermined strength, and the contact resistance between the electric wire 17 and the crimp terminal 10 does not fall below the reference value. When the electric wire 17 having the above-described connection state with the crimp terminal 10 is used in various machines, the crimp terminal 10 may be detached from the end of the electric wire during use, or the contact resistance with the crimp terminal 10 may be excessively large. May not work properly.

In an ordinary electric wire, the conducting wire is not always located at the center of the covering material in all sections as in the case of the electric wire 14, and there may be a portion where the conducting wire is partially eccentric, such as the electric wire 17. In this way, if the wire used is approaching the eccentric part of the conductor and a part of the conductor is removed when removing the covering material at the end, such a wire is not excluded. Not be.

In the case where the end of the electric wire from which a part of the conductor is removed is inserted into the crimp terminal 10 when the crimp terminal 10 is crushed, the case where the tip of the applicator 4 is worn or chipped is also considered. Similarly, the maximum value of the pressing force detected by the pressure sensor 5 decreases. However, unlike the case where the tip of the applicator 4 is worn or chipped, when the part of the conducting wire is cut like the electric wire 17, the crimping failure does not continue forever, and the conducting wire is unbalanced like the electric wire 14. The crimping failure can be eliminated by simply moving to a part that is not in mind. Therefore, defective products do not continue.

Similarly, when the crimp terminal 10 is crimped to an electric wire in which a part of the covering material at the end cannot be removed for some reason and remains, the change of the pressing force detected by the pressure sensor 5 is not changed. Although the value deviates from within the allowable range, if the coating material is completely removed thereafter, the defective product does not continue. In the case where the crimp terminal 10 is crimped while a part of the covering material of the end of the wire cannot be removed and is left, the maximum value of the pressing force detected by the pressure sensor 5 becomes large.

Therefore, in the press machine 1 of the present embodiment, a range which is an allowable standard of the bonding strength and the contact resistance between the electric wire and the crimp terminal 10 is determined in advance, and the change of the pressing force detected by the pressure sensor 5 is analyzed. Then, at that time, it is determined whether or not the bonding strength and the contact resistance between the electric wire and the crimp terminal 10 are within an allowable range based on the crimp state of the crimp terminal 10 to the end of the electric wire. When the analysis result of the change in the pressing force detected by the pressure sensor 5 indicates a crimping failure, a product formed by crimping the crimp terminal 10 to the end of the electric wire is excluded as a defective product. Once such a defective product has occurred, a predetermined number of subsequent products are excluded as defective products. If the change in the pressing force detected by the pressure sensor 5 during the formation of the last product is within the allowable range, the crimp terminal 1
It is determined that the cause of the poor crimping to the wire end of No. 0 is not wear or breakage of the applicator 4, and the press machine 1 continues the operation. In other words, the cause of the poor crimping of the crimp terminal 10 to the end of the electric wire is caused by a part other than the press machine 1 such that a part of the conductor is removed when the covering material of the electric wire is removed or a part of the covering material remains without being removed. Is determined to be abnormal.

As described above, the press 1 of the present embodiment is
A guide member 3 supported so as to move up and down, a power mechanism for moving the guide member 3 up and down, a work table 6 having an anvil 6a formed on an upper surface thereof, and a work table located at a lower end of the guide member 3; An applicator 4 for performing a crushing operation between the anvil 6a of the worktable 6 and a crimp terminal 10 as a part to be pressed on the anvil 6a of the table 6, and between the applicator 4 and the guide member 3; Intervened,
A pressure sensor 5 for detecting a pressure change.

Therefore, the press 1 of this embodiment is
When the crimp terminal 10 is crushed between the anvil 6a and the applicator 4, the pressure applied to the applicator 4 substantially equal to the pressure received by the crimp terminal 10 is faithfully applied to the pressure sensor 5 without being absorbed by other members. Therefore, depending on the state of the pressure change detected by the pressure sensor 5, it is possible to find an abnormality such as breakage of the applicator 4, breakage of the lead wire when removing the covering material of the electric wire, or remaining of the covering material. It is possible to prevent the loss due to poor crimping of 10 beforehand.

In the above description, the pressure sensor 5 is a piezo element. However, the pressure sensor 5 is not necessarily limited to a piezo element. In addition, a piezoelectric ceramic or the like may be used as long as a pressure change can be detected. Absent.

In the above description, the power mechanism for vertically moving the guide member rotates the crankshaft 8 with the electric motor 9, but may use a cylinder or the like.

[0048]

As described above, according to the press of the present invention, when the crimp terminal is crushed between the anvil and the applicator, the pressure applied to the applicator substantially equal to the pressure received by the crimp terminal is applied to other members. It is transmitted to the pressure sensor faithfully without being absorbed by the pressure sensor, etc. And other abnormalities can be found, and loss due to poor crimping of the crimp terminal can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a press according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of a press machine according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing the operation of the press according to the embodiment of the present invention, following FIG. 2;

FIGS. 4A and 4B are explanatory diagrams showing wear of an applicator of a press according to an embodiment of the present invention.

FIG. 5A is an explanatory view showing a temporal change of a vertical displacement amount of an applicator of a press according to an embodiment of the present invention;
(B) is an explanatory view showing a temporal change of the pressure applied to the applicator of the press according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing a state in which a covering material of an electric wire is normally removed.

FIG. 7 is an explanatory diagram showing a state in which a part of a conductive wire is cut when a covering material of the electric wire is removed.

FIG. 8A is an explanatory view showing a state in which a crimp terminal is crimped to an electric wire from which a covering material has been normally removed, and FIG. 8B is a diagram in which a part of a conductive wire is cut when the covering material is removed. It is explanatory drawing which shows the state in which the crimp terminal was crimped to the electric wire.

FIG. 9 is an explanatory view showing the operation of a press provided with a pressure sensor immediately below an anvil.

FIG. 10 is an explanatory view showing the operation of the press provided with the pressure sensor immediately below the anvil following FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine 2 Support member 3 Guide member 3a Guide hole 4 Applicator 5 Pressure sensor 6 Workbench 6a Anvil 7 Sliding member 8 Crankshaft 9 Electric motor 10 Crimping terminal 14, 17 Electric wire 15, 18 Coating material 16, 19 Lead wire

Claims (1)

[Claims] A guide member supported to move up and down; a power mechanism for moving the guide member up and down; a work table having an anvil formed on an upper surface; and a work table located at a lower end of the guide member. An applicator that performs a crushing operation between the anvil of the worktable with respect to the pressed part on the anvil of the table, and an applicator interposed between the applicator and the guide member,
A press machine comprising: a pressure sensor for detecting a pressure change.