JPH032328Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a cam press type that uses a slide cam to perform flange bending on a workpiece.

(Prior art) As a conventional cam press type, for example, the fifth and sixth
There are some as shown in Fig. 7 and Fig. 7. This cam press type is used to bend the flange of the upper tip of the front fender of an automobile as shown in FIG. In FIGS. 5 and 6, 1 is a lower holder installed on the bolster 2 of the press machine,
3 is a punch attached to this lower holder 1. A slide cam 4 is slidably provided on the lower holder 1 and can be guided by a guide member 5 to approach and separate from the punch 3. This slide cam 4 is always urged in a direction away from the punch 3 by an elastic means (for example, a coil spring) 6 interposed between it and the lower holder 1. 7 is a sectional die fixed to the end of the slide cam 4 on the punch 3 side; 8 is also provided on the end of the slide cam 4 on the punch 3 side so as to be slidable in the same direction as the slide cam 4; This cam pad presses and fixes the workpiece W to the punch 3 by abutting against a portion of the workpiece (front fender) W placed on the punch 3 adjacent to the flange forming portion. Reference numeral 9 denotes an elastic means (for example, a coil spring) whose one end abuts the slide cam 4 and the other end abuts against the cam pad 8, and which constantly biases the cam pad 8 in a direction toward the punch 3. The lower holder 1, punch 3, slide cam 4, guide member 5, elastic means 6, sectional die 7, cam pad 8, and elastic means 9 are combined to form a lower mold 12. Reference numeral 10 denotes an upper holder that is attached to the slide 11 of the press machine so as to face the lower holder 1, and can approach and move away from the lower holder 1 as the slide 11 moves up and down. A drive cam 14 is attached to the upper holder 10 at a position facing the slide cam 4 of the lower mold 12. And this drive cam 1
4 includes an inclined sliding contact surface 4 formed on the slide cam 4;
An inclined sliding surface 14a that can be slidably contacted with a is formed. 15 is provided on the upper holder 10 so as to be slidable up and down facing the punch 3 of the lower mold 12, and a slide 11
This is a pad that presses and fixes the work W to the upper surface of the punch 3 as the punch 3 descends. This pad 15 is constantly urged toward the punch 3 by an elastic means (for example, a coil spring) 16 interposed between the pad 15 and the upper holder 10. Note that the pad 15 is prevented from falling by a retainer pin (not shown). The upper holder 10, drive cam 14, pad 15, and elastic means 16 are combined to form an upper mold 17, and this upper mold 17 and the lower mold 12 are combined to form a set of cam press molds. ing.

When the workpiece W is placed on the punch 3 of the lower die 12 and the upper die 17 is lowered together with the slide 11, the pad 15 first comes into contact with the workpiece W and presses and fixes it to the punch 3. When the upper die 17 further descends while compressing the elastic means 16, the drive cam 14 contacts the inclined sliding surface 4a of the slide cam 4 with its inclined sliding surface 14a, and presses the slide cam 4 toward the punch 3. . The slide cam 4 pressed by the drive cam 14 compresses the elastic means 6 while being guided by the guide member 5 and slides closer to the punch 3.
First, the cam pad 8 comes into contact with a portion of the workpiece W adjacent to the flange forming portion and presses and fixes this to the punch. Then, when the slide cam further approaches the punch 3 while compressing the elastic means 6 and 9, the sectional die 7 comes into contact with the flange forming portion of the workpiece W, and cooperates with the punch 3 to form the flange F.

On the other hand, the cam press die shown in FIG. 7 does not have a cam pad on the slide cam 20 as in the cam press die shown in FIGS. The rest of the structure is the same as the cam press type shown in FIGS. 5 and 6.

(Problems to be Solved by the Invention) However, in the case of the cam press type shown in FIGS. 5 and 6, the sectional die 7 fixed to the slide cam 4 contacts the part of the workpiece W adjacent to the flange forming part, The cam pad 8, which presses and fixes the work W to the punch 3, is configured to move integrally with the slide cam 4 in the same direction until it comes into contact with the work W. Therefore, if the slide cam 4 cannot be approached from a direction perpendicular to the flange forming surface of the workpiece W due to mold design reasons, the cam pad 8 may also be moved toward the flange forming surface of the workpiece W as shown in FIG. Since it comes into contact with the adjacent part from an oblique direction (direction of arrow A in Fig. 6), the corner part 8a of the cam pad 8, which is most necessary for flange bending, is applied to the part of the workpiece W closest to the flange F. Vertical direction (6th
There is a problem in that the pressing force from the direction of arrow B in the figure becomes small, making it impossible to securely press and fix the relevant part, making it impossible to ensure the positional accuracy of the bending position and the surface accuracy in the vicinity of the bending position. Ta. Furthermore, due to the action of component force in the direction along the surface of the workpiece W (direction of arrow C in FIG. 6), the punch 3
Another problem was that stable flange bending could not be performed because the gap between the cam pad 8 and the cam pad 8 was not constant.

In addition to the above-mentioned problems, the cam press type shown in FIG. 7 also has the problem that, as shown in FIG. The corner portion 22a of the workpiece W sometimes came into contact with the workpiece W and damaged the surface of the workpiece W.

(Means and effects for solving the problem) This invention was made by focusing on such conventional problems. As the slide cam approaches the workpiece, a pressing means is provided which presses and fixes the workpiece to the punch by contacting the adjacent part of the workpiece before the slide cam, and presses the workpiece onto one die and the slide cam. The above-mentioned problem is solved by providing an orientation means for directing the moving direction of the means and bringing the pressing means into vertical contact with a portion of the workpiece adjacent to the processing portion.

(Example) This invention will be explained below based on the drawings.

FIGS. 1a to 4 are diagrams showing an embodiment of this invention. First, the configuration will be explained, and the same parts as the conventional one will be given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained. In the figure, 25
is driven by slidingly contacting the inclined sliding surface 14a of the drive cam 14 with its inclined sliding surface 25a, and the lower holder 1
This is a slide cam that slides horizontally while being guided by a guide member 5 on the top. A pad holder 26 is provided on the slide cam 25 so as to be slidable along an inclined sliding surface 24 having an angle of θ ₁ with respect to the horizontal plane (see FIG. 1a).
It is constantly biased in the direction of arrow D in FIG. 1b by a compression coil spring 27 interposed between . 32 is a drive cam fixed to the punch 3 side in the sliding direction of the upper slide cam 25 of the lower holder 1. This drive cam 32 comes into contact with an inclined sliding surface 26a formed on the pad holder 26, and slides the pad holder 26 in the direction of an angle θ ₂ with respect to the sliding direction of the slide cam 25 (see FIG. 1b). It has an inclined sliding surface 32a. This inclined sliding contact surface 32a and the inclined sliding contact surface 24 allow the pad holder 26 to
The part adjacent to the flange molding part can be approached from a direction perpendicular to the part (direction of arrow E in the figure). Both inclined sliding contact surfaces 24, 32a
constitutes orienting means for the pressing means 30.
The pad holder 26 is provided with a cam pad 28 indicated by the arrow E, which can come into contact with a portion adjacent to the flange forming portion of the workpiece W.
The cam pad 28 is always biased in the direction of arrow E, that is, in the direction of the workpiece W, by a coil spring 29 interposed between the cam pad 28 and the pad holder 26. The pad holder 26, coil springs 27, 29, and cam pad 28 are combined to press the workpiece W into the pressing means 3.
0, and the both inclined sliding contact surfaces 24, 32
a constitutes an orienting means for the pressing means 30. The slide cam 25, the pressing means 30, the drive cam 32, the lower holder 1, the punch 3, the guide member 5, the elastic means 6, and the sectional die 7 are combined to form a lower mold 33, and the upper holder 10, the drive The cam 14, pad 15, and elastic means 16 are combined to form a lower mold 34.

The operation of the cam press type constructed as described above will be explained next. When the lower die 34 descends, the pad 15 first comes into contact with the workpiece W and presses and fixes it to the punch 3. Next, when the upper mold 34 further descends while compressing the elastic means 16, the drive cam 14
contacts the inclined sliding surface 25a of the slide cam 25 with its inclined sliding surface 14a, and presses the slide cam 25 toward the punch 3 (the state shown in FIG. 2). As a result, the slide cam 25 approaches the punch 3 by compressing the elastic means 6 while being guided by the guide member 5, and the pad holder 26 first comes into contact with the drive cam 32. Then, the pad holder 26 slides onto the drive cam 3 while slidingly contacting the inclined sliding surfaces 26a and 32a.
2 and approaches a portion adjacent to the flange forming portion of the workpiece W placed and fixed on the punch 3 while compressing the coil spring 27 (the state shown in FIG. 3).
Eventually, the cam pad 28 comes into vertical contact with a portion of the workpiece W adjacent to the flange forming portion, as shown in FIG.
This is pressed and fixed to the punch 3. Slide cam 2
5 further approaches the punch 3 while compressing the coil springs 27 and 29, the sectional die 7 comes into contact with the flange forming part of the workpiece W and forms the flange F in cooperation with the punch 3, as shown in FIG. do. At this time, as mentioned above, the cam pad 2
8 is in perpendicular contact with the portion of the workpiece W adjacent to the flange forming portion, so that a sufficient vertical pressing force against the portion of the workpiece W closest to the flange F is ensured. Therefore, the bending position accuracy of the flange F and the surface accuracy in the vicinity of the bending position can be reliably maintained. Furthermore, since it is not affected by component forces in the direction along the surface of the workpiece W, the gap between the punch 3 and the cam pad 28 is constant, and stable flange bending can be performed. Further, since the cam pad 28 contacts the workpiece W perpendicularly, even if the workpiece W has some spring back, the corner of the campad 28 will not damage the surface of the workpiece W. After forming flange F, lower mold 3
4 reaches bottom dead center and then begins to rise,
The slide cam 25 is separated from the punch 3 while slidingly contacting the inclined sliding surface 14a of the drive cam 14 at the inclined sliding surface 25a by the biasing force of the elastic means 6.
As a result, the opposite effect to that described above occurs, first the sectional die 7 and the pad holder 26 gradually move away from the work W, and then the cam pad 28 separates from the work W. Next, the pad holder 26 separates from the drive cam 32, and eventually the slide cam 2
After the drive cam 5 stops, the drive cam 14 separates from the slide cam 25. During this time, the pad 15 continues to press the workpiece W onto the punch 3 simply by expanding the compressed elastic means 16. Eventually, the elastic means 16 is fully expanded, and the pad 15 is separated from the work W and rises together with the lower mold 34. After the lower die 34 reaches the top dead center and stops, the flange F
The workpiece W having been formed thereon is carried out of the mold, and a new workpiece W is carried in.

(Effects of the invention) As explained above, according to this invention,
The pressing means can be brought into vertical contact with a portion of the workpiece adjacent to the processing portion, regardless of the direction of movement of the slide cam. As a result, the bending position accuracy of the flange can reliably maintain the surface accuracy in the vicinity of the bending position, and stable flange bending can be performed. Furthermore, even if the workpiece has some spring back, the surface of the workpiece will not be damaged.

[Brief explanation of the drawing]

Figures 1a, b to 4 show an embodiment of the cam press mold according to this invention, in which Figure 1a is a front sectional view thereof, Figure 1b is a partially sectional plan view of the lower mold, Figures 2, 3, and 4 are partially sectional plan views showing different operating states of the lower die, Figure 5 is a front sectional view of the conventional cam press die, and Figure 6 is the bottom of the cam press die in Figure 5. Fig. 7 is an explanatory diagram of the working state of the mold, and Fig. 8 is a front sectional view of another conventional cam press die.
The figure is an explanatory diagram showing the contact state between the workpiece and the corner of the pad when spring back occurs in the workpiece in the cam press die shown in Figure 7. Figure 9 is an illustration of the upper tip of the front fender of a car, which is the workpiece. FIG. W...Work, F...Flange of work, 3...
...Punch, 14,32...Drive cam, 24,
32a... Inclined sliding contact surface (direction means), 25...
... Slide cam, 30 ... Pressing means, 33 ... Lower mold (one mold), 34 ... Lower mold (other mold).

Claims (1)

[Scope of utility model registration request] One mold has a punch that holds a workpiece, and a slide cam that can move close to and away from the punch and cooperates with the punch to perform flange bending on the workpiece when approached; and the other type has a drive cam that is separable and that contacts and drives the slide cam when approached, the cam press type having a drive cam that moves in a direction different from the movement direction of the slide cam. As the slide cam approaches the workpiece, a pressing means is provided which presses and fixes the workpiece to the punch by contacting the part of the workpiece adjacent to the machining part before the slide cam, and also A cam press type characterized in that the cam is provided with an orientation means for orienting the pressing means so as to vertically abut a part of the workpiece adjacent to the processing part.