JPH07106402B2 - Cam piercing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cam piercing device capable of simultaneously making a large number of holes in a workpiece in a radial direction.

(Prior Art) As a conventional example of a cam piercing device, there is, for example, one shown in FIGS. 4 (a) and 4 (b), and 50 in the drawing denotes an upper cam driver. For convenience of explanation, FIG. 4 (a) shows a state at the time of drilling of a cross section taken along a plane passing through the center of the piercing punch.

The upper cam driver 50 has an upper base 51 that abuts on its upper surface.
It is connected to the
As shown in FIG. 4 (b) showing a cross section taken along the line I-I of FIG. 4 (a), a notch 50 forming an inclined surface 50b parallel to the inclined surface 50a.
c is provided. An upper guide plate 52 is coupled to an intermediate portion of the inclined surface 50a, and a flange 53a of a cam slide 53 is slidably fitted in a space defined by the upper guide plate 52 and the cutout 50c. The cam slide 53 is provided with a notch 53b for mounting the spring 55 supported by the bracket 54 coupled to the slope 50d of the upper cam driver 50 in parallel with the slope 50b, and the upper part of the cam slide 53. To avoid interference with the flange 53c of
A cutout 50e is provided.

On the other hand, the slope 53d below the cam slide 53 is the slope 5
The direction of approaching each other with respect to 0b toward the center of the mold, that is, to the right, and the slope 53e on the lower side is slope 5
A piercing punch 56 is buried so as to be parallel to 3d. As shown in FIG. 4 (b), a flange 53f is partially provided along the slope 53d on the lower side surface of the cam slide 53 (note that this flange 53f is different from the upper flange 53a in the drawing). Right only).

In the lower cam driver 57 below the cam slide 53, an inclined surface 57a parallel to the inclined surface 53d, an inclined surface 57b on which the work 58 to be drilled is placed, and a through hole 5 through which the piercing punch 56 passes.
7c, a scrap discharge hole 57d communicating with the through hole 57c, and a notch 57e for connecting the guide plate 59 as shown in FIG. 5 (b) which is a bottom plan view, are provided. The driver 57 also functions as a piercing die.

The lower cam driver 57 is mounted on the lower base 62 together with the blank holder 61 that holds the workpiece 58 when the pad 60 is lowered by the spring force of the spring 59.

In this cam piercing device, when the upper cam driver 50 descends as the upper base 51 descends, the flange 53c of the cam slide 53 causes the upper cam driver 50 to move due to the spring force of the spring 55.
The cam slide 53 descends while contacting the notch 50e of
The lower slope 53d of the cam slide 53 and the lower cam driver 57
Of the cam slide 53 and the flange 53f of the cam slide 53 slides between the inclined surface 57a and the guide surface 59a of the guide plate 59 along the inclined surface 57a. A hole is drilled at a predetermined position of.

(Problems to be solved by the invention) By the way, in this conventional device, since the cam slide guide structure as described above is adopted, as shown in the upper plan view of FIG. B is the width dimension A required for the pierce pontin retainer plus twice the overlap width dimension (receiving width) C with the upper guide plate 52 (B = A + 2C). In order to configure a cam piercing device for simultaneously making a hole, when a plurality of sets of hole forming mechanisms including the above-mentioned parts are arranged on the same circumference, a large occupying space, that is, an occupying angle θ ₀ causes a small number (4 sets in this example). ) Can only be placed and it is difficult to make many holes at the same time.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem by allowing the upper and lower flange portions of a cam slide to be guided in the notches provided in the upper and lower cam drivers.

(Means for Solving the Problem) For this purpose, a cam piercing device of the present invention includes an upper cam driver provided with a notch forming a first inclined surface,
Lower cam drivers having second inclined surfaces which are provided in such a direction that they approach each other toward the center of the mold with respect to the inclined surfaces, and first and second parallel to the inclined surfaces which are respectively coupled to these cam drivers. An upper and lower guide plate forming a guide surface, a cam slide having upper and lower flange portions which can be fitted vertically between the inclined surface and the guide surface, to which a piercing punch is coupled, and the pierce based on the movement of the cam slide. In a cam piercing device including at least one pair of a punch and a piercing die, a cutout is provided in the lower cam driver, the second inclined surface is formed in the cutout, and the cross-sectional shape of the upper and lower guide plates is L. The first and second guide surfaces are moved in the shape of a letter to the notches of the cam drivers, and the cam slide is placed in the notches of the cam drivers. It is characterized in that it has to be guided by Oite the two guide surfaces.

(Operation) According to the device of the present invention, the cam slide is guided by the upper and lower guide plates having an L-shaped cross section in the notches provided in the upper and lower cam drivers. Since the guide surface parallel to the inclined surface formed by the notch and the side surface perpendicular to these guide surfaces also function as guide surfaces, the cam slide can be reliably guided.

As a result, the rigidity condition can be satisfied even when the upper and lower flange portions are configured by making the maximum width dimension of the cam slide equal to the width dimension of the piercing punch retainer. It is possible to arrange a large number of sets on the workpiece, and the cam piercing device thus constructed can simultaneously make a large number of holes in the radial direction on the work.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

FIG. 1 (a) is a sectional view showing the structure of a first embodiment of a cam piercing device of the present invention, and FIG. 1 (b) is a sectional view taken along the line II-II of FIG. 1, in which 10 is an upper cams driver. Indicates. 1 (a) and 1 (b) show the state at the time of drilling.

The upper cam driver 10 has an upper base 11 that abuts on its upper surface.
And a notch 10a provided thereunder forms a leftwardly inclined surface 10b. On the extension line of the inclined surface 10b, a notch 10c for mounting a cam slide described later,
10d is provided. An upper guide plate 12 having an L-shaped cross section is provided on a horizontal mounting surface 10e below the upper cam driver 10.
And the upper surface of the vertical flange of the upper guide plate 12 forms a guide surface 12a parallel to the inclined surface 10b.

The flange 13a of the cam slide 13 is slidably fitted in the space defined by the notch 10a of the upper cam driver 10 and the guide surface 12a of the upper guide plate 12. The cam slide 13 is provided with a partial cutout 13b for fitting the upper guide plate 12 and a lower guide plate to be described later while securing the width dimension A of the pierce pontin retainer as a whole, and the upper cam driver 10 has a cutout 13b. The spring 15 supported by the bracket 14 connected to the inclined surface 10f is attached to the inclined surface.
A notch 13c is provided for mounting parallel to 10b.
The flange 13d of the cam slide 13 slides in the notch 10c of the upper cam driver 10 during operation.

On the other hand, the slope 13e below the cam slide 13 is the slope 1
The piercing punches 16 are embedded in the lower slopes 13f so as to be parallel to the slopes 13e. Below the cam slide 13, a flange 13g is formed along the slope 13e by the notch 13b so as to correspond to the flange 13a.

A lower cam driver 17 is arranged below the cam slide 13 so that the inclined surface 17a thereof contacts the inclined surface 13e at the time of drilling. The lower cam driver 17 has a notch 17b for forming an inclined surface 17a parallel to the inclined surface 13e and a workpiece 18 to be punched.
17c (on which the workpiece 18 is cylindrical because it is a cylindrical shape) and the through hole through which the piercing punch 16 penetrates
17d and a scrap discharge hole 17e communicating with the through hole 17d are provided, and the lower cam driver 17 also functions as a piercing die. Further, a lower guide plate 19 having an L-shaped cross section is provided on a horizontal mounting surface 17f above the lower cam driver 17.
The lower surface of the vertical flange of the lower guide plate 19 forms a guide surface 19a parallel to the inclined surface 17a, and the cam slides into the space defined by the guide surface 19a and the cutout 17b of the lower cam driver 17. The flange 13g of 13 is fitted. The lower cam driver 17 is placed on the lower base 23 together with the blank holder 22 for holding the work 18 when the pad 21 descends by the spring force of the spring 20.

By the way, in the cam piercing device of this example, the space occupied by one set of the drilling mechanism is greatly reduced as compared with the conventional example as described below. Therefore, as shown in FIGS. 2 (a) and 2 (b), It has become possible to radially arrange a large number of sets of drilling mechanisms (in FIGS. 2A and 2B, three sets of drilling mechanisms are typically shown). That is, FIG. 1 (a)
2 (a) which is a plan view of the upper mold looking up from the line III-III of FIG. 2, the maximum width dimension B ′ of the cam slide 13 is made equal to the minimum necessary pierce pontine retainer width dimension A,
The notch 13b for fitting the upper guide plate 12 is partially provided to absorb the receiving width C of the upper guide plate 12 within the range of the maximum width B'of the cam slide (B '= C).
+ D = A), maximum width dimension B (B =
It was possible to reduce the cam slide width dimension by 2C compared to (A + 2C) (the same applies to FIG. 2B, which is a plan view of the lower die viewed from the line IV-IV in FIG. 1A). B '
Of course, the relationship of = C + D = A is established). In this case, the occupying angle θ that determines the occupying space per set of drilling mechanism is also smaller than that of the conventional example. It is possible to configure a cam piercing device capable of accommodating a drilling mechanism and simultaneously making a large number of holes in a radial direction on a cylindrical work.

Here, considering the strength of the cam piercing device, as shown in FIGS. 1 (a) and 1 (b), the cam slide
With respect to the flanges 13a and 13g of 13, the pair of slopes 10b, 12a and 17a, 19a function as guide surfaces, and the side surfaces 12b, 19b of the vertical flanges of the upper and lower guide plates 12, 19 also function as guide surfaces. In addition, since the area of the vertical sliding surface where the side surface of the cam slide 13 that opposes the side surfaces 12b and 19b and the upper and lower cam drivers 10 and 17 abut is increased compared to the conventional example, Even considering the difference in structure from the example (the flange 13a on the top of the cam driver is reduced to one side only to the right, and the side face of the cam slide is partially dug), there is still a problem in terms of rigidity. Therefore, the cam slide 53 can be reliably guided.

Next, the operation of the cam piercing device will be described with reference to FIGS. 3 and 1 (a) and (b). First, before drilling, as shown in FIG. 3, the cam slide 13 and the upper cam driver 10 are separated from the lower cam driver 17 and are positioned above. At this time, the cam slide 13 moves leftward by the spring force of the spring 15 and makes a stroke until its flange 13d contacts the notch 10c of the upper cam driver 10, and the pad 21 is moved by the spring 20 supported by the upper cam driver 10. It is separated from the work 18.
When the upper base 11 descends from this state, the lower slope 13e of the cam slide comes into contact with the inclined surface 17a of the lower cam driver 17, and then slides between both slopes so that the flange 13g of the cam slide 13 forms the inclined surface 17a and Lower guide plate guide surface 19
It enters between a and reaches the state of Fig. 1 (a). At this time, the piercing punch 16 makes many holes at the predetermined position of the work 18 at the same time. Therefore, the accuracy of drilling is improved as compared with the case where a large number of holes are made in several times.

In the cam piercing device of this example, the distance from the mounting surface of the upper guide plate 12 to the tip of the piercing punch 16 (indicated by L in FIG. 3) is shorter than that of the conventional example.
There is no fear that the cam slide 13 will be agitated by the moment and the operation will become unstable during drilling.

(Effect of the Invention) As described above, the cam piercing device of the present invention guides the cam slide by the upper and lower guide plates having an L-shaped cross section in the notches provided in the upper and lower cam drives. Along with the guide surface parallel to the inclined surface of the notch of the guide plate, the side surface perpendicular to these guide surfaces also functions as a guide surface to reliably guide the cam slide. Even when the upper and lower flange portions are configured to have the same width dimension as the pierce pontin retainer, the rigidity condition can be satisfied. Therefore, the required space can be reduced and a large number of sets of the above mechanisms can be arranged on the same circumference. With the cam piercing device configured as described above, a large number of holes can be simultaneously formed in the work in the radial direction.

[Brief description of drawings]

FIGS. 1 (a) and 1 (b) are sectional views showing the configuration of the first embodiment of the cam piercing device of the present invention and its II-II sectional view, respectively, and FIGS. 2 (a) and 2 (b) are the first respectively. III-III line of the figure,
A plan view of the upper mold and a lower mold seen from the line IV-IV, FIG. 3 is a view showing a state when the upper mold and the lower mold are separated in the same example, and FIGS. 4 (a) and 4 (b) are conventional examples. FIG. 5 is a cross-sectional view showing the configuration of the cam piercing device and its cross-sectional view taken along the line I-I, and FIGS. 10 …… Upper cam driver, 10a …… Notch 10b …… Inclined surface 12 …… Upper guide plate, 12a …… Guide surface 13 …… Cam slide, 13a, 13g …… Flange 16 …… Pierce punch 17 …… Lower cam Driver (pierce die) 17a …… Sloping surface, 17b …… Notch 18 …… Workpiece 19 …… Lower guide plate 19a …… Guide surface.

Claims (1)

[Claims] 1. A lower cam having an upper cam driver provided with a notch forming a first inclined surface and a second inclined surface provided so as to approach each other toward the center of the mold with respect to the inclined surface. A driver, an upper and lower guide plate coupled to the cam driver and forming first and second guide surfaces parallel to the inclined surfaces, and an upper and lower flange that can be fitted between the inclined surface and the guide surface in the vertical direction. A cam piercing device including at least one cam slide having a portion to which a piercing punch is coupled, and a piercing die that cooperates with the piercing punch based on the movement of the cam slide, wherein a notch is provided in the lower cam driver. The second inclined surface is formed in this notch, and the cross-sectional shape of the upper and lower guide plates is L-shaped so that the first and second guide surfaces are formed on both the cams. A cam piercing device, which is relocated to a notch of a driver so that the cam slide is guided by the both guide surfaces in the notches of the both cam drivers.