JPS643547Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the improvement of the same mold tool used in the technical field of press mold tools. The present invention relates to a press tool for punching the hole in a part provided with a hole.

(Prior Art) Conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 55-33613, there is a method in which holes are punched using a punching die. On the other hand, a press tool is used to drill holes H ₁ , H ₂ , and H ₃ at symmetrical positions on both left and right sides (top and bottom in the drawing) and in the center of the part W shown by the two-dot chain line in FIG. , punches and dies (in this specification, "punch" and "die" both mean for making holes) were provided to correspond to all the holes. Therefore, especially when the production volume of the parts is small, the cost of molding tools tends to be high. In such cases, attempts have been made to reduce the press die cost by approximately half by punching each half of the part in two steps, but this simply involves preparing punches and dies that are approximately half symmetrical. However, there were problems such as the mutual positions of the machined holes being inaccurate, and the same hole being machined twice, resulting in inaccurate hole shapes.

(Purpose of the invention) In view of the above-mentioned problems, in this invention, a molding tool for accurately drilling holes in a component in which holes are provided at symmetrical positions on both left and right sides and in the center part is provided in a simple and inexpensive manner. Its purpose is to provide.

(Structure of the invention) The structure of the invention is a press molding tool for punching holes in a component in which holes are provided at symmetrical positions on both left and right sides and in the center, and the lower die is attached to either the left or right side of the component. A die is provided in which only one half and the center part of the part can be placed, and a die corresponding to the hole to be drilled is provided in one side and the center part of the part, and the upper die is provided with a punch facing the die, and , a slider is disposed on the upper die and is slidable facing the upper end of the punch for the hole in the center of the part, and the slider is in a first position and a non-position for actuating the punch for the hole in the center of the part. The lower mold includes a first latch pawl that can be contacted when the slider is in the first position, and a first latch pawl that can be contacted when the slider is in the second position. A second latch pawl that can be contacted when the latch pawl is in the position is provided oppositely, and the first latch pawl and the second latch pawl are pivoted at their center portions and are normally held in a horizontal position by spring means. The upper die is biased and held, and when the upper die rises,
The present invention is characterized in that the first latch pawl or the second latch pawl corresponding to the sliding position of the slider contacts the end of the slider to switch the sliding position of the slider.

(Function) As a result, the sliding position of the slider changes to the first or second position each time the upper die rises, and the punch for the central hole is switched between activation and deactivation, and the punch for the central hole is changed to the first or second position. Parts can be pressed in two steps using a single press tool, without having to be repeatedly processed.

(Example) An example of this invention will be described below with reference to the drawings.

The entire press mold tool of this invention is shown in Figures 1 to 3.
The press machine 3 has a lower die 1, an upper die 2, a ram 3c that holds the upper die 2 and reciprocates up and down, and a die 4 provided on the lower die 1.
a ₁ , 4a ₂ , 4a ₃ , punches 4b ₁ , 4b ₂ , 4b ₃ provided on the upper die 2 , and a slider provided on the upper die 2 so as to be slidable left and right above the punch 4b ₁ . 5 and latch mechanisms 6, 6 for controlling the left and right positions of the slider 5. The part W to be punched has the shape shown surrounded by the two-dot chain line in FIG. 1, and holes H ₁ , H ₂ , H ₃ as shown by the solid line and the two-dot chain line are punched. That is, six round holes _H1 are arranged in series on the center line S in the left-right direction in the figure, that is, in the center, and are further arranged above and below the center line S in the figure, that is, on both left and right sides of the part W. Two triangular holes H ₂ and six round holes H ₃ are punched out symmetrically. The lower die 1 fixed on the base 3a of the press machine 3 is large enough to place half of one side of the part W including the center part, and has a hole in the upper surface shown by a solid line in FIG. , that is, a total of 14 holes corresponding to the six round holes H ₁ in the center, the two triangular holes H ₂ on the sides, and the six round holes H ₃
The dice 4a ₁ , 4a ₂ , and 4a ₃ are fixed.
The part W is positioned by a stopper 1a. The press machine 3 has guide columns 3b, 3b erected on a base 3a, and a ram 3c on the guide columns 3b, 3b.
The upper die 2 is attached to the lower surface of the ram 3c, and the ram 3c is driven by a drive device (not shown). Punches 4b ₁ , 4b ₂ , 4b ₃ are protruded from the lower surface of the upper die 2 in correspondence with the 14 dies 4a ₁ , 4a ₂ , 4a ₃ .
Among these punches, 6 placed on the center line S
Regarding the punch 4b ₁ corresponding to the round holes H ₁ ,
It is fitted so as to be slidable in the vertical direction, and is biased upward by a compression spring 8. Furthermore, a slider 5 is fitted into the upper mold 2 above each of these punches _4b1 so as to be slidable in the left-right direction (left-right direction in FIG. 2) with respect to the ram 3c. The lower surface of the slider 5 has a convex portion 5a that receives the upper end of the punch _4b1 .
A cam surface 5c is formed with a recess 5b into which the upper end fits. And slider 5
When it slides to the left in FIG. 2, the convex part 5a comes into contact with the upper end of each punch _4b1 and becomes the first position for operating the punch _4b1 , and when it slides to the right, it comes into contact with the concave part 5b. The upper end portion of each punch 4b ₁ is inserted into the second position, in which the punch 4b ₁ is inoperative.

The latch mechanism 6 includes a first latch pawl 11 on the left side in FIG. 2 that can be contacted when the slider 5 is in the first position (the left sliding position in FIG. position (right sliding position in Figure 2)
A pair of latch claws are provided oppositely to the lower die 1, with the second latch claw 11 on the right side in FIG. That is, square pillars 9 are erected on the lower die 1 on the left and right sides of the slider 5, and the upper part of the square pillars 9 is bifurcated by grooves in the left and right direction in FIG.
A shaft 10 in the front-rear direction (direction perpendicular to the plane of the paper in FIG. 4) is rotatably supported in this portion, and an intermediate portion of a square bar-shaped latch pawl 11 is fixed to the shaft 10. Further, the bottom of the groove of the square column 9 is formed with a slope 9a sloped toward the slider 5 and a slope 9b sloped toward the opposite side.
a, 9b and regulates their rotation angle. axis 1
One end of the square pillar 9 projects outward from the prism 9, and a pair of mutually parallel perpendicular planes 10a, 10a are formed on the outer peripheral surface of this projecting portion. On the other hand, spring means 12 is provided to sandwich the flat surfaces 10a, 10a. This spring means 12 is a U-shaped spring with its parallel tips extending into the plane 10 of said shaft 10.
a, 10a are sandwiched, and the base end 12a is fixed to the prism 9. Thus, the latch claw 11
Since the flat surfaces 10a and 10a are held by the spring means 12, a horizontal posture is always maintained, and even if the latch pawl 11 is forced to rotate until it comes into contact with the slope 9a or 9b, this force is released. By doing so, it can return to the horizontal position again.
Further, sloped surfaces 5d and 5d having a downward slope at the tip are formed on the upper surface of both ends of the slider 5, respectively, and an inclined surface 11a with a downward slope at the tip is also formed on the upper surface of the end of each latch pawl 11 on the slider 5 side. ing. Thus, regardless of the sliding position of the slider 5, when the ram 3c is lowered, the lower surfaces of both ends of the slider 5 come into contact with the inclined surfaces 11a of the latch pawl 11, and even if the latch pawl 11 is rotated, the latch pawl 11 will not move. Before coming into contact with the slope 9a, the lower end of the slider 5 comes out of contact with the slope 11a, and the slider 5 moves further down while maintaining its sliding position. Further, when the ram 3c rises, the top end of the slider 5 on the protruding side (for example, the left side in the solid line diagram in FIG. 4) is the slider 5.
When the slider 5 comes into contact with the bottom surface of the tip of the latch pawl 11 (the first latch pawl on the left side in FIG. 4) corresponding to the sliding position, and the slider 5 further rises, the above-mentioned inclined surface 5d and the bottom surface of the tip of the latch pawl 11 come into contact with each other. When the latch pawl 11 comes into close contact with the slope 9b, its rotation is restricted, and while the slider 5 is being raised, a force is applied to the slider 5 in a lateral direction (rightward in FIG. 4). On the other hand, the non-protruding side of the slider 5 is in a state where it has avoided the latch pawl 11, and the slider 5 ends up in the sliding position where it protrudes to the opposite side (see Fig. 4, 2).
(as shown by the dotted chain line in the figure). A rubber cushion 7 is fixed to the lower surface of the upper mold 2 to cushion the shock.

Hereinafter, the operation of the above-mentioned embodiment will be explained.
First, as an initial state, it is assumed that the slider 5 is located at the first position on the left side in FIGS. 2 and 4, and the ram 3c is located at the raised position (the position shown in FIG. 4). The operator places the unpunched part (blank) of the part W on the lower mold 1 with the stoppers 1a, 1a.
After positioning the ram 3c in contact with the ram 3c, the ram 3c is lowered by a drive device (not shown). During its descent, the lower surfaces of the left and right ends of the slider 5 come into contact with the inclined surfaces 11a of each latch pawl 11, but each latch pawl 11 rotates and retreats against the biasing force of the spring means 12, and the slider 5 is moved to the left and right position. remains as it is, and the ram 3c further descends. As a result of this descent, the punches 4b ₁ and 4b ₂ come into contact with the part W and are further pushed down. At this time all punches 4b ₁
Since the upper end of the punches 4b 1 and 4b 2 is in contact with the convex portion 5a of the cam surface 5c, the upper ends of the punches 4b ₁ and 4b ₂ act effectively.
Accordingly, the part w has a shape as shown by the solid line in Figure 1.
14 holes are drilled. And then, Ram 3
c rises and returns to the original position again, but on the way, the slope 5d on the upper surface of the left end of the slider 5 (Fig. 4)
comes into contact with the lower surface of the end of the slider 5 side (inner side 9) of the first latch claw 11 at the left end, and this first latch claw 1
1 rotates counterclockwise in FIG. 4 against the biasing force of the spring means 12, but the lower surface of the outer end of the latch pawl 11 comes into contact with the inclined surface 9b to restrict this rotation. state shown in solid line). In this case, since the right end of the slider 5 does not protrude as much as the left end, the slider 5 passes through without resistance by being retracted by the rotation of the second latch pawl 11 on the right side.

If ram 3C rises further from this state,
Due to the contact between the inclined surface 5a and the lower surface of the first latch pawl 11, a force is applied to the slider 5 to the right in the figure, and the slider 5 is pushed to the right and slides to the second position. (Illustrated by the two-dot chain line in Figure 4). Next, the operator turns the part W so that the front side faces the opposite side, contacts the stopper 1a, and repositions the ram 3.
to perform the operation. This time, since the slider 5 is located at the second position on the right side, the punch _4b1 rises due to the biasing force of the compression spring 8, its upper end fits into the recess 5b, and its lower end does not reach the part W. figure,
Does not act as a punch. Therefore, punch 4b ₂ ,
Only 4b ₃ acts, and the hole indicated by the two-dot chain line in Figure 1
H ₂ and H ₃ are perforated and the punching operation is completed.

By repeating the above steps, the sliding position of the slider 5 changes to the left or right every time the ram 3c rises, and the punch _4b1 is switched between activation and deactivation.
Press processing of part W is performed 2 times using one press mold tool.
This can be done in stages.

(Effects of the invention) This invention is applicable to approximately half of the entire shape of the part, including the hole in the center, in order to drill a part with holes at symmetrical positions on both left and right sides and in the center. It is a press tool consisting of a lower die and an upper die for perforating, and the lower die and the upper die are provided with a punch and a corresponding die, and the punch in the center is connected to the punch by a slider and a pair of latch claws. Since this is a press tool in which the punch repeats activation and deactivation, and each half of the part is punched in two strokes, the hole in the center part will not be punched twice, and the hole that has been punched will be The shape and dimensions are accurate. In addition, the number of punches and dies can be reduced, and the cost of press molding tools can be greatly reduced, which has the excellent effect of making it possible to provide parts at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and Fig. 1 is a plan view taken along the - line in Fig. 2 showing the press molding tool, Fig. 2 is a partially cutaway top view, and Fig. 3 is a plan view of the press mold tool. Fig. 4 is a vertical sectional front view of the main part showing the relationship between the slider and the latch mechanism, and Fig. 5 is a partially enlarged front view of the vicinity of the latch pawl attachment part surrounded by a chain line in Fig. 2. It is a diagram. 1...lower die, 1a...stopper, 2...upper die,
3...Press machine, 3a...Base, 3b...Guide column, 3c...Ram, 4a ₁ ...Die (for central round hole _H1 ), 4a ₂ ...Die (for triangular hole _H2 ) , 4
a ₃ ...Dice (for outer round hole H ₃ ), 4b ₁ ...Punch (for center round hole H ₁ ), 4b ₂ ...Punch (for triangular hole H ₂₎
), 4b ₃ ...Punch (for outer round hole _H3 ), 5...
Slider, 5a... Convex portion, 5b... Concave portion, 5c...
...Cam surface, 5d... Inclined surface, 6... Latch mechanism,
7...Rubber cushion, 8...Compression spring, 9...
Prismatic, 9a, 9b...Slope, 10...Axle, 10a
...Flat surface, 11... Latch claw, 11a... Inclined surface, 12... Spring means, 12a... Base end, W...
Part, S... Center line, H ₁ ... Central round hole, H ₂ ...
...triangular hole, H ₃ ...outer round hole.

Claims (1)

[Scope of utility model registration request] A press mold tool for punching holes in a component in which holes are provided at symmetrical positions on both left and right sides and in the center, and the lower die places only one half of the right or left half of the component and the center. a die that corresponds to the hole to be drilled in one side and the center of the part; an upper die is provided with a punch opposite to the die; A slidable slider is disposed facing the upper end of the punch for the part, the slider being slidable between a first position for actuating the punch for the hole in the center of the part and a second position for inactivating the punch. and the lower die further includes a first latch pawl that is contactable when the slider is in a first position and a second latch pawl that is contactable when the slider is in a second position. The first latch pawl and the second latch pawl are pivoted at their central portions and are normally held in a horizontal position by a spring means, and the upper die is A press mold tool characterized in that when the slider moves up, the first latch claw or the second latch claw corresponding to the sliding position of the slider comes into contact with the end of the slider to switch the sliding position of the slider. .