JPH0114353Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a dish that performs countersink drawing on a metal plate using a punch, and then cuts out the bottom of the countersink drawing that protrudes from the back side of the metal plate to form a countersink drawing hole. The present invention relates to a drawing hole processing device.

(Prior Art) The present applicant first developed a countersink hole processing device in which a punch is elastically held via a coil spring on an upper plate that is to be pressurized by a press ram, and the tip of the punch is attached to the workpiece. A countersunk drawing protrusion with a height corresponding to the thickness of the metal plate is protruded, and a die having a mold hole is installed on the lower plate so as to be movable left and right on the lower plate. The installed cam is engaged with the cam driven part installed on the die, and as the pressure of the upper plate is lowered, the work plate set on the die is first subjected to countersink drawing with a punch, and then further raised. We have proposed a method in which the die is driven left and right by the cam as the plate descends, and the plate-drawing bottom protruding from the back surface of the plate to be processed is sheared and removed by the die hole. (Japanese Patent Application No. 58-148951 (see Japanese Patent Application Laid-Open No. 60-40620)).

(Problem to be solved by the invention) However, in the processing device proposed in the previous application, the punch is held elastically by a coil spring, and countersunk drawing is performed by the force of the spring. Strict attention must always be paid to the selection and adjustment of coil springs in order to accurately draw the discs.

This proposal aims to further improve this point.

(Means for Solving the Problems) In order to achieve the above object, the present invention is provided with an upper plate 3 which is supported to be able to rise and fall freely in order to receive pressure from above, and which is fixed to the upper plate 3 which is always pushed upwards and below the upper plate 3. A punch 8 is supported on the lower plate 1 so as to be movable in the front-rear direction, and the punch 8 has a countersunk protrusion 9 at the tip with a height corresponding to the thickness of the workpiece plate. 8
In front of the die 27, a die 27 having a die hole 29 for performing countersink drawing in cooperation with the punch 8 is suspended from the upper plate 3 and supported so as to be freely raised and lowered. A die that elastically holds the die 27 that descends together with the upper plate 3 in a downward stroke of the receiving upper plate 3 at a punchable position where the axes of the mold hole 29 of the die 27 and the plate drawing protrusion 9 coincide with each other. A retaining spring 40 is provided, a cam 16 is provided to protrude downward from the upper plate 3, and the punch 8 is provided with a cam 16 which is attached to the upper plate 3 during the downward stroke of the upper plate 3.
When the die 27 is held in the punchable position, a cam follower is disposed in order to move the punch 8 forward for disk drawing in response to the pressing force of the descending cam 16, and the upper plate 3 is actuated. A rod 32 is provided to protrude downward, and the die 27 receives the pressing force of the actuating rod 32, which descends after the completion of the disk drawing, during the downward stroke of the upper plate 3, and causes the die 27 to shear the bottom of the disk drawing. A locking portion 31 is disposed at a position where it is to be lowered.

Hereinafter, embodiments of the present invention will be described with reference to drawings in which an apparatus for forming a countersink hole in an aluminum profile is shown.

(Example) In Figures 1 and 2, columns 2, 2 are vertically erected at two diagonal corner positions of the rectangular lower panel 1, and the upper panel 3 is placed parallel to the lower panel 1 on both columns 2, 2. It is penetratingly supported so that it can be raised and lowered freely in the state, and is constantly springing upward by coil springs 4, 4 wound around both pillars.
A pair of guide frames 6, 6 are laid in parallel on the rear base plate 5 of the lower plate 1 as shown in the third figure, and a T-shaped guide groove 6' is formed between the two guide frames. A T-shaped portion 7' formed at the lower part of a punch holder 7 having a substantially rectangular parallelepiped shape is engaged with the punch holder 7 so as to be slidable in the front-rear direction.

The punch holder 7 has punches 8, 8 protruding horizontally on its front surface, each having a truncated conical countersunk protrusion 9 at its tip with a height corresponding to the thickness of the aluminum profile to be machined, and on its rear surface. has a vertical driven surface 10 on the upper half surface,
An inclined driven surface 11 that extends rearward and slopes continuously with the driven surface 10 is formed on the lower half surface, and a grooved lower surface 12' of the workpiece holding block 12 is formed on the upper surface.
is slidably fitted in the same direction as the forward and backward direction of the punch holder 7, and a guide pin 14 with a head is inserted into the elongated hole 13 in the forward and backward direction of the presser block 12, and the tip of the pin 14 is punched. It is screwed onto the holder 7. 15 is the presser block 12 mentioned above.
This is the rear vertical driven surface.

A cam plate 16 that acts on the driven surfaces 10, 11, and 15 is vertically projected downward from the rear end of the lower surface of the upper plate 3, and the punch holder 7 is attached to the front surface of the cam plate 16 from the lower end. A vertical cam surface 17 extending over a part of the vertical driven surface 10 and the entire vertical driven surface 15 of the presser block 12, a small lift inclined cam surface 18 continuous with the upper end of the cam surface 17, and continuous with the upper end of the inclined cam surface. A vertical cam surface 19 is formed, and in this example, when the upper plate 3 is at the uppermost position as shown in the first figure, the starting point (lowermost end) of the vertical cam surface 17 is relative to the starting point (uppermost end) of the inclined driven surface 11. vertical driven surfaces 10 and 15 on the vertical cam surface 17 with a delay distance d.
The positional relationship is such that the starting point of the inclined cam surface 18 comes into contact with the starting point of the vertical driven surface 15.

As a means for pressing the punch holder 7 and presser block 12 against the cam plate 16, a cam receiving plate 20 is vertically erected at the rear end of the lower plate 1 as shown in the first figure. Each spring support bolt 21, 21, 22, 22 is passed through horizontally movably, and the tip of each bolt is connected to the cam plate 1.
Further penetrate the long holes 23, 23 opened in 6,
The bolts 21, 21 are screwed into the presser block 12, the lower bolts 22, 22 are screwed into the back of the punch holder 7, and coil springs 24, 25 are interposed between the cam receiving plate 20 and the head of each spring support bolt, respectively. The punch holder 7 and the presser block 12 are always urged against the cam plate 16 by the spring, and when the cam plate 16 is lowered, the vertical driven surface 15 is first pushed by the inclined cam surface 18 to release the presser block. 12 for a required distance, and then push the inclined driven surface 11 with the vertical cam surface 17 to release the punch holder 7.
is advanced to a position where it reaches a die surface, which will be described later, and during this time, the vertical cam surface 19 slides on the vertical driven surface 15 to continue the advanced state of the presser block 12.

On the other hand, a pair of guide columns 2 are installed in the front part of the lower plate 1.
6, 26 stand vertically with appropriate intervals between each other,
A fourth guide rail part 26, 26' of both guide columns has a fourth
As shown in the figure, grooves 27', 27' formed on both left and right side surfaces of the die 27 are engaged so as to be vertically slidable.
Reference numerals 28, 28 are stoppers for preventing the die 27 from coming off, which are fixed to the upper ends of the guide columns 26, 26.

The die 27 is approximately gate-shaped when viewed from the front, as shown in the second figure, and there are mold holes 29 on both left and right sides of the die 27.
29 are formed horizontally at positions where the axial center lines of the punches 8 and 8 coincide with the axial center lines when viewed from the top, and locking protrusions 30 and 31 are provided protruding from the rear surface of the die at appropriate vertical intervals. It has been done.

Operating rod 3 to be locked to the locking protrusions 30 and 31
2 is provided vertically protruding downward from the front end of the upper plate 3, and a claw 33 protruding from the lower end of the operating rod 32 is positioned between the locking protrusions 30 and 31, so that the upper plate 3 is When the die 27 is in the uppermost position, the pawl 33 of the operating rod 32 is engaged with the locking protrusion 30 to suspend the die 27 in the uppermost position, as shown in the first diagram, and at this time the die holes 29, 29 are connected to the punch 8. , 8 by a punch displacement distance d ₁ equal to the above d. 34 is a spring receiver protruding from the lower surface of the upper plate 3;
Reference numeral 5 denotes a die pushing spring interposed between the spring receiver 34 and the upper surface of the die 27, which constantly urges the die 27 downward.

Inside the left and right sides of the die 27, there are vertical spring guide holes 36 opening at the lower end surface as shown in the second figure.
36 is opened, and on the other hand, hole 3 is opened on the underside of the lower panel 1.
The spring support rods 38 having flange portions 39 at the lower ends are respectively projected upward from through holes drilled in the upper surfaces of 7 and 37 and inserted into the spring guide holes 36 and 36, and the head at the upper end of the insertion and the upper surface of the lower plate 1 are inserted. Die holding springs 40, 40, which are stronger than the die pushing spring 35, are wound around both support bars 38, 38 between the two support bars 38, 38 to elastically hold the upper ends of the support bars 38, 38 at a predetermined height position. There is. In this case, when the upper plate 3 is at the highest level and the die 27 is suspended at the highest level, the upper ends of the support rods 38, 38 are inside the spring guide holes 36, 36 as shown in the first and second figures. It is separated by a distance d ₂ equal to the punch deflection distance d ₁ from the bottom surface, and therefore, the upper plate 3 is lowered by a distance d ₂ and the die hole 29 is aligned with the punch 8.
When the punching position is reached where the axes are aligned with the
The die 27 is held in a punchable position by contacting the inner bottom of the die 27.

When the upper plate 3 further descends, the die 27 remains in the position where it can punch, and only the operating rod 32 descends, but when the predetermined processing is completed between the punch 8 and the mold hole 29, the claw of the operating rod 33 is die 27
The lower locking protrusion 31 and the spring receiver 34 are in contact with the upper surface of the die, respectively. When the upper plate 3 further descends, the operating rod 32 is designed in a positional relationship such that in this example, the upper hole edge of the mold hole 29 descends until it is approximately on the axial extension of the punch 8.

The function of this device will be explained along with its operation. As shown in the first figure, after setting the aluminum profile m (double-dashed line) on the die 27 surface, the press ram is lowered onto the upper plate 3 and the upper plate 3 is lowered. The presser block 12 is moved forward and the aluminum profile m is pressed into the die 27 at the tip of the block.
It is pressed against the surface and fixed vertically and immovably together with the base plate 5. Then, as shown in FIG.
1, the punch holder 7 is advanced and countersink drawing is performed on the aluminum profile m between the countersink drawing protrusion 9 and the die hole 29 as shown in Figure 5a. Next, with the subsequent lowering of the upper plate 3, the locking protrusion 31 is moved by the operating rod 32.
The die 27 is lowered by pressing the upper surface of the die with the spring receiver 34, thereby shearing approximately the upper half of the plate drawing bottom b at the upper hole edge of the mold hole 29 as shown in Figure 5b. When the upper plate 3 is raised by the springs 4 as the press ram rises, the die 27 is moved by the spring 4.
0,40 to a position where the axis line coincides with the punch 8, and then the locking protrusion 30 is pulled up by the claw 33 of the operating rod 32 which rises to a position above the axis line of the punch 8 by a distance _d1 , As a result, the fifth
c As shown in the figure, the remaining lower half of the countersink drawing bottom b is sheared at the lower hole edge of the die hole 29, and the bottom part b is separated and removed to form the countersink drawing hole s.

When the die 27 is lowered to shear the plate drawing bottom b, the design may be changed so that the die 27 is lowered to a position where the entire plate drawing bottom b is sheared by the upper hole edge of the mold hole 29.

According to the countersink hole processing device of this invention, the punch moves forward and backward by the elevation and descent of the cam protruding from the upper plate to perform countersink drawing between the hole of the die and the punch to a predetermined depth. This makes it possible to always perform plate drawing accurately, which is extremely effective in practice.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; FIG. 1 is a partially cutaway side view, FIG. 2 is a partially cutaway front view, FIG. 3 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 4 is a partially cutaway side view. of-
Line sectional views Nos. 5, 5a, 5b, and 5c are enlarged sectional views showing the process of forming a countersunk hole. 1...Lower board, 3...Upper board, 8...Punch, 9...
...Counter drawing protrusion, 16...Cam plate, 27...Die,
29... Mold hole, 31... Locking protrusion, 32... Operating rod, 40... Die holding spring.

Claims (1)

[Scope of Claim for Utility Model Registration] An upper panel 3 which is supported so as to be able to rise and fall to receive pressure from above and which is always pushed upward, and a lower panel 1 fixed below the upper panel 3, which is above the lower panel 1. A punch 8 having a countersunk drawing protrusion 9 at the tip with a height corresponding to the thickness of the workpiece plate is supported so as to be movable in the front and rear direction.
In front of the die 27, a die 27 having a die hole 29 for performing countersink drawing in cooperation with the punch 8 is suspended from the upper plate 3 and supported so as to be freely raised and lowered. A die that elastically holds the die 27 that descends together with the upper plate 3 in a downward stroke of the receiving upper plate 3 at a punchable position where the axes of the mold hole 29 of the die 27 and the plate drawing protrusion 9 coincide with each other. A retaining spring 40 is provided, a cam 16 is provided to protrude downward from the upper plate 3, and the punch 8 is provided with a cam 16 which is attached to the upper plate 3 during the downward stroke of the upper plate 3.
When the die 27 is held in the punchable position, a cam follower is disposed in order to move the punch 8 forward for disk drawing in response to the pressing force of the descending cam 16, and the upper plate 3 is actuated. A rod 32 is provided to protrude downward, and the die 27 receives the pressing force of the actuating rod 32, which descends after the completion of the disk drawing, during the downward stroke of the upper plate 3, and causes the die 27 to shear the bottom of the disk drawing. A countersink hole processing device in which a locking portion 31 is arranged at a position where it should be lowered.