JPH0760377A - Blanking equipment - Google Patents

Abstract

PURPOSE:To provide a blanking equipment which can prevent the movement of a stripper in the blanking operation, prevents the flow of the work, provides a long service life of a die, and provides a highly precise product. CONSTITUTION:An upper die 21 and a lower die 22 are mutually aligned by a ball guide device 48 or each stroke of the blanking. A steel ball 58 mounted on the tip of an abutting part 56 provided on the upper die 21 side in a constant position reproducing device 55 is abutted on the inclined surface in a V-shaped hole 60 of a guide block 57 mounted on a stripper 23 side. The movement of the stripper 23 by the clearance between the guide pin and the guide bush of a guide device 53 can surely be prevented. Concentricity of the respective punches 25, 26, 27 with the corresponding dies 33, 36, 38 can not be lost. The blanking is executed in the condition where the work 12 is securely held by this stripper 23 and the lower die 22, and the die galling of the respective punches 25, 26, 27 and the dies 33, 36, 38, the uneven blanking of the work, and the occurrence of failures such as the defective working precision can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching apparatus for obtaining a precision work piece having a smooth cut surface without a fracture surface from a material having a relatively large plate thickness.

[0002]

2. Description of the Related Art Conventionally, for example, when forming an electrode 11 of an electron gun for a color cathode ray tube, as shown in FIG. 5, three apertures 11a are formed in a relatively thick material such as austenitic stainless steel material of about 2.0 mm. Are punched out, and the periphery of these apertures 11a is punched into a rectangular shape. Then, as shown in the strip layout of FIG. 6, such processing sequentially performs the processing of steps A to E while sequentially feeding the material 12 having the width W at the pitch P.

That is, first, in step A, two prepared holes corresponding to the apertures 11a on both sides in FIG. 5 are punched.

Next, in step B, the two apertures 11a having the prepared holes are piloted, and one prepared hole corresponding to the central aperture 11a is bored.

In step C, the three apertures 11a having the prepared holes are shaving.

Further, in the step D, the shaving 3
Pilot for each aperture 11a.

Then, in step E, the outer shape is removed as shown in FIG.

In this way, the electrode 11 of the electron gun having the three apertures 11a shown in FIG. 5 is formed by the series of steps A to E.

In addition, the above-mentioned processing is performed between the upper die which is the first die having the punch attached thereto, the lower die which is the second die having the die for the punch, and the upper die and the lower die. A progressive press machine with a stripper located.

Then, two punches for punching the lower holes are provided in the upper die at a position corresponding to the step A in FIG.
One punch for pre-hole drilling is provided at a position corresponding to step 3, three shaving punches are provided at a position corresponding to step C, and an outer shape punching punch is provided at a position corresponding to step E. Is provided.

Further, the lower die is provided with two dies for pre-hole drilling at positions corresponding to step A in FIG. 6, and one die for pre-hole drilling and 2 at positions corresponding to step B. A first die plate provided with three pilots and provided with three shaving dies at a position corresponding to step C, and three pilots provided at a position corresponding to step D, at a position corresponding to step E A second die plate provided with a die for removing the outer shape is attached in a predetermined positional relationship facing the upper die.

Further, the stripper has a process A shown in FIG.
At the position corresponding to step B, two holes for penetrating the two punches for pre-drilling are provided, and at the position corresponding to step B, 1
One hole for penetrating the punch for pre-hole drilling and two holes for avoiding two pilots from the lower die are provided respectively, and three shaving punches are provided at positions corresponding to step C. Three holes to be penetrated are provided, holes for avoiding the three pilots from the lower mold are provided at positions corresponding to the step D, and openings for penetrating the punch for contour cutting are provided at positions corresponding to the step E. Is provided.

Here, the holes or openings provided in the stripper are set to have a clearance of about 3 μm or less with the corresponding punches, and the corresponding punches are configured so that they can slide freely.

The mutual positions of the upper die and the lower die are aligned by the ball guide device. That is, the ball guide device is a combination of a guide shaft implanted from the upper die to the lower die and a guide tube provided in the lower die and fitted with the guide shaft. A large number of balls are provided on the guide shaft so that the guide shaft can freely slide in the axial direction. Then, by these combinations, the upper die and the lower die are guided so as to always maintain a predetermined relationship.

The position accuracy of the stripper is determined by the slide guide device. This slide guide device is a guide pin implanted from the upper mold toward the stripper,
It is a combination of a guide bush that is provided on the stripper and that fits with this guide pin.There is a slight gap between the inner peripheral surface of the guide bush and the outer peripheral surface of the guide pin, and the guide pin is aligned along its axial direction. It is configured to slide and guide.

As the electrode 11 of the electron gun, in order to further improve the focus characteristics of the color cathode ray tube,
A shape with as large an aperture as possible within a limited neck diameter is required. Further, both the aperture and the outer shape are required to have a precise shape with a smooth cut surface without a fracture surface. Therefore, the clearance between these punches and the die must be extremely small, about 5 μm on each side.

When the clearance is small as described above, for example, the side pressure at the time of removing the outer shape becomes larger than expected, and as a result, the material flows in the direction opposite to the feeding direction. As a result, the shaving punch with the smallest clearance with the die contacts the corresponding die,
The die life is only about 5000 punches on average.
Moreover, as described above, since the material is caused to flow by the lateral pressure, the punching dimension of the material in the feed direction becomes unbalanced in the lateral direction of the material, and the roundness of the aperture of the electrode 11 of the electron gun, the pitch accuracy, It is difficult to obtain the flatness, and the precision of these parts often occurs, and the yield is reduced due to the unstable precision.

Further, conventionally, a large value is required for both the material width W and the feed pitch P shown in FIG. 6, and the utilization rate of the material is poor.

Further, since the excessive side pressure due to the small clearance described above also occurs during the strip layout shown in FIG. 6, the material feed pitch P is gradually extended and accumulated. Therefore, in the shaving step C, the center of the hole to be shaving processed in the strip layout is not located at the center of the shaving punch and the die, the material is cut into pieces, and the shaving punch is bent. It also causes a "galling" phenomenon when it comes into contact with the die, which is also the cause of the shortening of the die life.

If the material is not punched while the material is securely restrained between the die and the stripper, the drooped portion of the punched portion becomes large.

FIG. 7 shows a normal punching process,
In (a), the punch 15 comes into contact with the material 14 on the die 13, crushing occurs as shown in (b) as the punch 15 descends, and shearing starts as shown in (c).
The fracture starts as shown in (d) and the punching ends as shown in (e).

In this case, a sagging portion 14a due to crushing occurs around the contact portion of the material 14 with the punch 15, and a flash 14b and a satin-like fracture surface portion 14c occur on the die 13 side.
A sagging portion 14d is also formed around the contact portion on the die 13 side.

Here, as described above, unless the material is punched in a state where the material is securely restrained, the crushing distance of the material at the initial stage of the punching process shown in (b) becomes long, and the crushing process shown in (e) results. The sagging portion 14a and the sagging portion 14d on the opposite side also become large.

As a result, in the shaving process, the narrow side portion between the apertures is brought into a concave shape toward the die side, so that the flatness accuracy of the product deteriorates.

As shown in FIG. 5, the deterioration of the parts precision and the deterioration of the material utilization ratio are such that the cross section width between the apertures is as narrow as about 20% of the material thickness, and the shaving allowance is not large. However, these are requirements from the characteristics of color cathode ray tubes and cannot be changed, and even under such conditions, it is desirable to improve high component accuracy and material utilization rate. ing.

Here, when the punching work by the conventional press was observed in detail, the following was found.

First, during press punching, the stripper slightly moves in the direction opposite to the material feeding direction. This is because the sliding guide device used for the accuracy of the stripper has a slight gap between the guide pin and the guide bush to allow sliding, and because of this gap, the stripper is required for each press stroke. Move slightly.

Further, during press punching, the material flows between the stripper and the die in the direction opposite to the material feeding direction due to the above-mentioned lateral pressure and the like.

[0029]

As described above, conventionally, during press punching, the stripper slightly moves in the direction opposite to the material feeding direction, or the material flows in the direction opposite to the material feeding direction. Has a problem that the life of the product is shortened and the dimensional accuracy of the product is deteriorated.

An object of the present invention is to prevent the movement of the stripper or prevent the flow of material at the time of press punching, so that a die having a long life and high dimensional accuracy can be obtained. To provide a processing device.

[0031]

A punching apparatus according to claim 1, wherein a first die having a punch attached thereto, a second die having a die combined with the punch, and the first die. A stripper, which is located between the die and the second die and has a hole through which the punch slides, and the material held between the stripper and the die is punched by the punch. In the punching device for punching, the first die is attached in a state of being opposed to one surface of the stripper, and a contact portion in which a steel ball is attached to a tip facing the stripper and a contact portion of the stripper. A guide block having a positioning hole opened upward and arranged at a position facing the tip, so that the outer surface of the steel ball comes into contact with the inclined surface of the positioning hole during the punching operation. Those having a constant has been place reproduction apparatus.

According to a second aspect of the present invention, there is provided the punching device according to the first aspect, wherein the stripper is provided with a projection portion that engages with the material during punching and restricts the flow and extension of the material. is there.

[0033]

In the punching device according to the first aspect of the present invention, the outer surface of the steel ball provided at the tip of the abutting portion of the fixed position reproducing device at the time of the punching operation is the inclined surface in the positioning hole of the guide block opposite to the stripper side. When the stripper is brought into contact with the sliding guide device, the stripper is prevented from moving due to the gap between the guide pin and the guide bush, and the stripper is positioned in a stable state with high positional accuracy.

A punching device according to a second aspect is the punching device according to the first aspect, in which the projection provided on the stripper engages with the material during punching, so that the flow and extension of the material are restricted.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the punching machine of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the punching apparatus includes an upper die 21 as a first die, a lower die 22 as a second die facing the upper die 21, and these. It is a progressive press machine having a stripper 23 located between an upper mold 21 and a lower mold 22.

Then, in the upper mold 21, the step A shown in FIG.
To the position corresponding to the apertures 11a on both sides shown in FIG.
Two punches 25 for punching the pilot hole are provided for forming the. Further, at a position corresponding to the step B, although not shown because it is a hidden position, one punch for punching the prepared hole is provided for forming the central aperture 11a shown in FIG. . Further, three shaving punches 26 are provided at positions corresponding to step C, and outer shape punching punches 27 are provided at positions corresponding to step E.

A first die plate 31 and a second die plate 32 as shown in FIG. 4 are attached to the lower die 22. Further, the first die plate 31 has
Two pre-hole drilling dies at positions corresponding to step A in FIG.
33 are provided. In addition, at the position corresponding to step B, 1
A die 34 for drilling a plurality of pilot holes and two pilots 35 are provided. Furthermore, three shaving dies 36 are provided at positions corresponding to the step C. Further, the second die plate 32 is provided with three pilots 37 at positions corresponding to the process D, and a die 38 for outline cutting at a position corresponding to the process E, respectively.

Further, the die plate of the stripper 23
As shown in FIG. 3, the stripper plate 23a facing the 31 and the die plate 32 are provided with holes through which various punches provided in the upper die 21 are inserted. That is, FIG.
Two holes 41 through which the two punches 25 for punching the pilot holes are formed are provided at the position corresponding to the step A shown in FIG.
Further, at a position corresponding to the step B, one hole 42 for penetrating one punch for preparation of the pilot hole and two holes 43 for avoiding the two pilots 35 from the lower mold 22, Each is provided. In addition, at the position corresponding to step C, 3
Three holes 44 are provided for penetrating the shaving punch 26 of the book.
A hole 45 that avoids the pilot 37 of the book is provided, and an opening 46 through which the punch 27 for punching the outer shape is formed is provided at a position corresponding to the step E.

The holes 41, 42, 44 or the openings 46 provided in the stripper plate 23a are set with clearances of about 3 μm or less on both sides with the corresponding punches.
Each of the corresponding punches is configured to be freely slidable.

Further, the mutual positions of the upper mold 21 and the lower mold 22 are aligned by the ball guide device 48 shown in FIGS. This ball guide device 48 has an upper mold 21.
From the lower die 22 and the guide cylinder 50 fitted to the guide shaft 49 provided in the lower die 22, and a large number of balls are provided on the inner periphery of the guide cylinder 50. 51 is provided, and the guide shaft 49 is configured to be freely slidable in the axial direction thereof. The combination of these guides the upper die 21 and the lower die 22 so that the upper die 21 and the lower die 22 always maintain a predetermined relationship.

The positional accuracy of the stripper 23 is determined by the slide guide device 53. This sliding guide device 53
(Not shown) is a combination of a guide pin planted from the upper mold 21 toward the stripper 23 and a guide bush provided on the stripper 23 and fitted with the guide pin. A small gap is provided between the guide pin and the outer peripheral surface of the guide pin so that the guide pin slides along the axial direction.

The stripper 23 uses the upper mold 21,
It is suspended in a state that it can move back and forth within a certain range in the vertical direction in the figure. However, a spring material is provided between the stripper 23 and the upper die 21, and the stripper 23 is constantly subjected to a force in the direction of separating from the upper die 21 by the spring material.

Next, the fixed position reproducing device 55 will be described.

As shown in FIG. 2, the fixed position reproducing device 55 includes a stripper plate 23a and a die plate 31,
A plurality of places, for example, six places are arranged so as to surround 32, and are formed between the upper mold 21 and the stripper 23 as shown in FIG. That is, the upper mold 21 has a stripper
The contact portion 56 is formed toward one surface of the stripper 23, and the stripper 23
On the side, the guide block 57 faces the tip of the contact portion 56.
Is provided.

Further, the abutting portion 56 has a precision grade steel ball 58 of about 30 mm attached to the tip portion thereof facing the guide block 57 on the stripper 23 side. The steel ball 58 is held by a cylindrical ball guide 59 whose inner circumference is slightly tapered. That is, the steel ball 58 is held by the ball guide 59 by setting the gap between the inner surface of the lower end portion of the ball guide 59 in the figure and the outer surface of the steel ball 58 to be slightly negative and accurately pushing.

Further, inside the ball guide 59, a ball receiving slide 61 for pressing and supporting the steel ball 58 from above in the drawing is integrally mounted. Here, the steel ball of the ball receiving slide 61
The contact surface with 58 is inclined about 15 ° with respect to the horizontal direction in the drawing. By grading in this way, a steel ball is used for each stroke of the punching press machine.
58 is rotated and rolled little by little to prevent linear wear of the steel balls 58.

Further, the guide block 57 has a V-shaped hole 60 as a positioning hole having a V-shaped cross-section which opens upward.
On the upper surface in the drawing. The positional relationship is set so that the center of the V-shaped hole 60 and the center of the steel ball 58 are concentric when viewed from the upper surface in the drawing, and the outer surface of the steel ball 58 is an inclined surface of the V-shaped hole 60 during punching operation. These facing relationships are set so as to abut.

In the above structure, when punching the material 12 having the width W shown in FIG. 6, the material 12 is set between the stripper 23 and the lower die 22 of the punching apparatus shown in FIG. Then, the material 12 is sequentially fed to the right in the drawing, and the upper die 21 is vertically moved to punch. It should be noted that the vertical movement of the upper die 21 at each pitch P is one stroke for punching.

Here, the punching is performed for each feed pitch P as shown in the strip layout of FIG.

First, in step A, the punch 25 and the die 41 are used to punch a prepared hole corresponding to the apertures 11a on both sides in FIG.

Next, in step B, the position guide by the pilot 35 and the pilot hole punching corresponding to the central aperture 11a in FIG. 5 are performed by a punch (not shown).

Then, in the step C, the punch 26 and the die 36 shave the three holes which have been prepared.

In step D, position guidance is performed by the three pilots 37.

Further, in step E, the punch 27 and the die 38 are used to remove the outer shape to complete the electrode 11 of the electron gun of the color CRT which is the product shown in FIG.

The mutual alignment of the upper die 21 and the lower die 22 is performed by the ball guide device 48 and the positional accuracy of the stripper 23 is determined by the slide guide device 53 for each punching stroke.

Further, the fixed position reproducing device 55 prevents the stripper 23 from moving for each punching stroke.
That is, the steel ball 58 at the tip of the contact portion 56 provided on the upper mold 21 side.
However, since it comes into contact with the inclined surface in the V-shaped hole 60 of the guide block 57 provided on the stripper 23 side at each punching stroke, the stripper 23 is surely moved by the gap between the guide pin of the slide guide device 53 and the guide bush. Can be stopped.

In this way, since the stripper 23 does not move for each punching stroke and keeps a fixed position, each punch
The concentricity between the 25, 26, 27 and the corresponding dies 33, 36, 38 does not collapse. Since the punching operation is performed while the material 12 is firmly held by the stripper 23 and the lower die 22, each punch 25, 26, 27 and die 33,
It is possible to prevent the occurrence of defects such as galling with 36 and 38, piece breakage of material, and poor machining accuracy.

The effect becomes more remarkable when the stripper plate 23a of the stripper 23 is provided with a coin punch-shaped projection 63 as shown in FIG. This protrusion
63 is a hole that avoids the pilot 37, for example, as shown
A plurality of, for example, four, are provided around 45. Of course, the size, arrangement, number, etc. of the protrusions 63 are not limited to those shown in the figures, and may be changed as appropriate.

According to this structure, the protrusions are formed at the time of punching.
Since 63 is engaged with the material 12, the material 12 does not move and is more firmly held by the stripper 23, so that the flow and the extension of the material 12 can be surely regulated.

In this way, the stripper 23 does not move,
Moreover, by firmly holding the material with the stripper 23 and the lower mold 22, the life of the mold is more than doubled as compared with the conventional case. Also, the width W and feed pitch P of the material 12 can be made smaller than before, and the material utilization rate is 3 compared to the conventional one.
It improved by about 3%.

Further, the die plates 31, 32 shown in FIG.
Of the die plate 31, the portion provided with the pilot 35 and the die 34, the portion provided with the shaving die 36, and the portion provided with the pilot 37, respectively.
By forming it partially higher than the upper surface of 32, the holding force for the material 12 becomes strong. In this case, the height of each part is H1 <H
0.06mm-0.3mm so that 2 <H3 <H4
Set to a degree.

By forming in this way, the material 12 can be more firmly held under pressure with the stripper 23 during punching. Therefore, sagging due to crushing in the initial stage of punching at the time of punching a prepared hole or punching at the time of shaving is reduced, pitch dimension accuracy, roundness and flatness accuracy are further stabilized, and productivity is improved.

[0064]

According to the punching apparatus according to the first aspect of the present invention, the outer surface of the steel ball abuts the inclined surface in the positioning hole during the punching operation, which is based on the gap between the guide pin and the guide bush of the slide guide apparatus. Since the movement of the stripper can be prevented and the stripper can be positioned in a stable state with high positional accuracy, it is possible to effectively prevent the movement of the stripper and the flow of material during punching, resulting in a long mold life. Moreover, a product with high dimensional accuracy can be obtained.

According to the punching apparatus of the second aspect,
In addition to the punching device according to claim 1, since the projection provided on the stripper engages with the material during punching, the flow and extension of this material can be regulated, and a product with higher dimensional accuracy can be obtained. You can

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a punching apparatus of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing an example of the shape of a stripper plate of the same punching device.

FIG. 4 is a perspective view showing an example of the shape of a die plate of the same punching device.

FIG. 5 is a perspective view showing an electrode of an electron gun which is an example of the punched product.

FIG. 6 is a plan view showing a strip layout of the punching material.

FIG. 7 is a cross-sectional view showing a punching process. (A) Diagram showing one punching process (b) Diagram showing next punching process of (a) (c) Diagram showing next punching process of (b) (d) Shown next punching process of (c) Drawing (e) Diagram showing the next punching process of (d)

[Explanation of symbols]

 12 Material 21 Upper mold as first mold 22 Lower mold as second mold 23 Stripper 25, 26, 27 Punch 33, 36, 38 Die 55 Fixed position reproduction device 56 Abutment part 57 Guide block 58 Steel Sphere 60 V-shaped hole as positioning hole 63 Projection

Claims (2)

[Claims] 1. A first die having a punch attached thereto, a second die having a die to be combined with the punch, and located between the first die and the second die, And, in a punching processing device comprising a stripper having a hole that penetrates the punch in a sliding state, and punching a material held between the stripper and the die by the punch, the first mold is The stripper is attached so as to face one surface of the stripper, and an abutting portion having a steel ball attached to the tip facing the stripper, and the stripper is extended upward at a position facing the tip of the abutting portion. A guide block having an opened positioning hole, and a fixed position reproducing device set so that the outer surface of the steel ball abuts the inclined surface of the positioning hole during the punching operation. Punching apparatus that. 2. The punching apparatus according to claim 1, wherein the stripper is provided with a protrusion that engages with the material at the time of punching and restricts the flow and extension of the material.