JP2000015361A - Coining die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely exchange a coining die, a lower coining punch and an upper coining punch without needing any severe labor and to improve working efficiency. SOLUTION: This coining die is provided with a lower die member wherein a lower coining punch 106 which is seated on a lower punch pedestal 1, a lower punch holder 13 which is taperingly fit into the lower coining punch, a lower clamp 14 which is fit into the lower punch pedestal 1 and engaged with the lower punch holder 13 to be vertically movable, a lower worm wheel 16 which is screwed into the lower clamp 14 and a lower worm 18 which meshes with the worm wheel are included, and die holders 22A, 22B which hold a coining die. And an upper die member, which includes an upper coining punch 126, an upper punch holder 48, an upper clamp 49, an upper worm wheel 51 and an upper worm 53, is arranged in an upper punch pedestal 47 attached to the lower surface of a slide so as to be upside down with respect to the lower die member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coining die, and more particularly, to a lower die provided on a bolster and a slide facing up and down reciprocatingly. The present invention relates to a die of a coining press machine for stamping the upper and lower surfaces of a coin-shaped blank with an upper die configured to perform stamping.

[0002]

2. Description of the Related Art FIG. 7 is a front sectional view of an axial center of upper and lower mold portions of a coining press machine, FIG. 8 is a sectional view taken along line EE of FIG. 7, and FIG. FIG. 9 showing
10 showing the GG section of FIG. 7, FIG. 11 showing the HH section of FIG. 10, FIG. 12 showing the JJ section of FIG. 7, and FIG. 13 showing the KK section of FIG. explain. This prior art shows a structure of the type already on the market.

An octagonal outer housing 103 is provided at the center of a bolster 102 provided below a window of a frame 101.
14 stands. A lower punch base 104 having a top surface in a horizontal plane, a male screw 104a threaded at an upper end thereof, and a tapered portion 104b having a smaller diameter at an upper portion is formed and stored in a bottomed center hole 103a of the housing 103. Have been. A cylindrical portion 106 is provided on the upper surface of the lower punch table 104.
A lower coining punch 106 having a tapered portion 106b whose diameter is enlarged downward at the lower part following a is mounted. The upper surface of the lower coining punch 106 is engraved with prints, patterns, and the like for coining the lower surface of the coin-shaped blank.

In order to center the lower coining punch 106 and fix the lower coining punch 106 to the lower punch table 104, a taper hole 107 a that fits into the taper portion 106 b of the lower coining punch 106 is formed at the center, and the male screw 104 a of the lower punch table 104 is formed. A lower punch holder 107 in which a female screw 107b to be screwed is threaded is provided. The tapered portion 106b of the lower coining punch 106 is taper-fitted into the tapered hole 107a, the female screw 107b is screwed into the male screw 104a of the lower punch base 104, and the handle is hooked on the hook hole 107c on the side surface.
, The lower impression punch 106 is strongly pressed onto the lower punch table 104 and seated. Housing 1
Adjustment screw 10 toward the center
8A, 108B, 108C, and 108D are screwed together. The adjusting screw is brought into contact with a tapered portion 104b having a diameter reduced above the lower punch table 104, and the lower punch table 104 is inserted into the bottomed center hole 103a of the housing 103. The lower pressure stamping punch 106 is centered while being pressed against the bottom. As shown in FIGS. 7 and 10, the lower punch table 104 is provided with a two-way chamfered surface 104c that serves as a detent when the lower punch holder 107 is rotated.

[0005] Above the lower punch holder 107, a coining die 109 through which a cylindrical portion 106a of the lower coining punch 106 penetrates is provided in a center hole 109a thereof. The central hole 109a of the coining die 109 is formed to have an inner diameter such that the coin-shaped work after stamping has a predetermined outer peripheral diameter.
The two divided die holders 111A and 111B that hold the coining die 109 at the center are supported by grooves 101a and 101b that are opened horizontally on the side surface of the frame 101 facing the window.

As shown in FIG. 12, the grooves 101a and 101b are formed on a front downward inclined surface 101c and a rear downward inclined surface 101d with a vertex of a sectional line passing through the center of the mold and dividing the front and rear. I have. Both ends of the front die holder 111A divided into two by the cross-sectional line are formed on the inclined surface corresponding to the front downward inclined surface 101c, and the respective ends are fitted into the grooves 101a and 101b. Further, both ends of the rear die holder 111B are formed on inclined surfaces corresponding to the downwardly inclined surfaces 101d, and the respective ends of the both ends are fitted in the grooves 101a and 101b.

[0007] Then, bolts 112A, 112B, 1 screwed into the frame 101 in parallel with the grooves 101a, 101b.
As shown in FIG. 11, 12C and 112D respectively fix the die holders 111A and 111B from outside through washers. The center hole for holding the coining die 109 drilled in a state where the die holders 111A and 111B are put together has an annular groove formed in the center of the thickness.
The upper and lower positions of the lower half 09 are inserted by inserting an annular convex portion.

On the lower surfaces of the die holders 111A and 111B, slidably fitted are formed on projections 103a and 103b formed on the front and rear side surfaces of the housing 103 and formed with left and right and front and rear positioning guide surfaces. Guide bodies 105A and 105B each having a U-shaped horizontal section are fastened. Therefore, the housing 103 can move up and down while maintaining the axis accurately.

The coining die 109 and the lower punch holder 1
07, a compression spring 116 is interposed. A knockout 113 that penetrates the bolster 102 at the center of the mold and is moved up and down as needed by a drive device (not shown) is provided. 10
4. The lower punch holder 107 and the lower stamping punch 106 are lifted through the bottom plate 114.

A mounting plate 122 fastened to the lower surface of a slide 121 moved up and down by a toggle mechanism (not shown) includes
As shown in FIG. 9, a U-shaped upper punch table holder 123 having a front surface opened is fastened to a position facing the lower coining punch 106 by a bolt. The upper punch table holder 123 has a jaw 123a formed on the inner periphery of the upper surface, and a flange 124a having two parallel planes projecting from the upper end of the upper punch table 124 and serving as a detent engages with the upper punch table 124. Is suspended. The upper punch table 124 has a tapered portion 124b having a diameter reduced downward at the upper portion, and a male screw 124c is threaded, and the lower surface is a seating surface of the upper impression stamp 126.
On the seating surface, an upper coining punch 126 having a tapered portion 126a having a diameter decreasing downward is formed on the upper portion.

An upper punch holder 127 formed around a tapered hole 127a to be fitted into the tapered portion 126a of the upper coining punch 126 is screwed into a female screw 127b threaded on the inner periphery of the cylinder into a male screw 124c of the upper punch base 124. By doing so, the upper impression stamp 126 is held and the upper surface is strongly pressed against the lower surface of the upper punch table 124 to be seated. The lower surface of the upper coining punch 126 is engraved with a print or pattern for coining the upper surface of the coin-shaped blank. The four adjustment bolts 128A, 128B, 128C, toward the center at the left and right two places on the opening side of the upper punch table holder 123 and the two left and right places at the back.
128D is screwed therein, and the centering adjustment of the upper coining punch 126 with respect to the lower coining punch 106 can be performed.

In the coining process of the prior art having such a configuration, the coin-shaped blank is supplied to the upper surface of the lower coining punch 106 in the hole 109a of the coining die 109 by the transfer device, and then the toggle mechanism is operated by the driving device. Then, the slide 121 is lowered, the upper coining punch 126 enters the center hole 109a of the coining die 109, and the upper and lower surfaces of the coin-shaped blank are coined by cooperation with the lower coining punch 106, and the blank diameter is enlarged. The coin-shaped work is processed to a regular size.

[0013]

When the type of coin-shaped work to be coined in the die of the coining press machine having such a structure is changed, the lower coining punch 106 and the upper coining stamp which form a pair with it are changed. Punch 126, coining die 1
09 must be replaced. The exchange procedure is as follows.

First, the upper stamping punch 126 is moved to an upper position with the slide 121 as a rising end. First, the coining die 109 is replaced. Bolts 112A, 112
B, 112C and 112D are removed, and the die holders 111A and 111B divided into two are pulled out by sliding the inclined surfaces 101c and 101d of the grooves 101a and 101b. The stamping die 109 is removed. However, since the operation is troublesome and the die holder is heavy, it requires careful attention to take it out of the machine. There was a problem that required man-hours.

Second, when replacing the lower coining punch 106, the heavy housing 103, the lower punch table 104,
In order to take each member of the lower punch holder 107 out of the machine in an integrated state, it is necessary to pay close attention to avoid injury, to require rigorous labor, to reduce work efficiency, and to require excessive man-hours for setup change. there were.

Further, since the lower stamping punch 106 is strongly pressed against the lower punch table 104, the lower punch holder 107 is screwed by the wedge action of the tapered surface with the lower punch holder 107 and the elastic deformation of the screw surface. A large rotation torque is required to loosen the torque. Since the lower punch table 104 taken out of the housing 103 is stopped and fixed, and a hand tool is used to directly rotate the hook hole 107c of the lower punch holder 107 to directly rotate the work, a severe labor is required and work efficiency is poor. There has been a problem that excessive setup man-hours are required.

Third, when replacing the upper coining punch 126, the heavy upper punch table 124 and the upper punch holder 1 are replaced.
27 must be pulled out of a state of being suspended from the upper punch table holder 123, requiring careful attention so as not to cause injury, requiring enormous labor, and having a poor work efficiency and an excessive number of man-hours for replacement. There was a problem that required.

Further, as in the case of the lower impression punch 106 and the lower punch holder 107, a large rotating torque is required to loosen the upper punch holder 127. Upper punch table 12
4 so that it does not rotate, and a hand tool is used to directly rotate the hook hole 127c of the upper punch holder 127. Therefore, severe labor is required, work efficiency is poor, and excessive setup man-hours are required. And other problems.

The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a stamping die capable of improving work efficiency without requiring safe and severe labor when exchanging a coining die, a lower stamping punch, and an upper stamping punch.

[0020]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention according to the first aspect of the present invention is directed to a lower mold provided on a bolster, and a slide which can reciprocate up and down and is opposed to the lower mold. A stamping press machine for stamping the upper and lower surfaces of a coin-shaped blank with an upper mold arranged as described above, wherein the lower mold is fitted in a hole of a housing provided upright on the upper surface of the bolster. A lower punching stand which can be moved up and down, a lower pressure stamping punch formed at the lower end of which has a tapered portion decreasing in diameter upward and seated on the upper end of the lower punching table, and fitted with the taper portion of the lower stamping punch. A lower punch holder having a possible tapered hole and a circumferential groove formed on the outer circumference; a male screw threaded at a lower part; and a flange formed at an upper inner circumference so as to mesh with the groove of the lower punch holder. Lower clamp that can be moved only in the vertical direction together with the lower punch holder A lower worm wheel in which a female screw is threadably threaded with a male screw of the lower clamp; a lower worm shaft pivotally supported so as to mesh with the lower worm wheel; and the housing so as to surround the lower impression stamp. A die holder fixed to the upper end of the die holder, and a coining die having an inner diameter for forming the coin-shaped work after the coining process in a predetermined outer shape and detachably attached to the die holder, and rotating the lower worm shaft. The lower worm wheel is rotated by moving the lower punch holder together with the lower clamp to vertically move the lower stamping punch,
The upper mold, an upper punch table fastened to the lower surface of the slide member, an upper stamping punch having a tapered portion that is reduced in diameter downwardly formed at an upper end portion and seated at a lower end of the upper punch table,
An upper punch holder having a tapered hole that can be fitted into the tapered portion of the upper coining punch and a circumferential groove formed on the outer periphery; An upper clamp having a flange formed so as to be meshable with the upper punch holder and movable only in the vertical direction together with the upper punch holder; an upper worm wheel in which a female screw is threadably engageable with a male screw of the upper clamp; and an upper worm wheel. And an upper worm shaft rotatably supported so as to mesh with the upper worm wheel by rotating the upper worm shaft,
The upper punch holder can be detached by moving the upper punch holder up and down together with the upper clamp.

According to the present invention, the lower die rotates the lower worm wheel by rotating the lower worm shaft, and vertically moves the lower punch holder together with the lower clamp screwed with the lower worm wheel. The upper die is rotated by rotating the upper worm shaft to rotate the upper worm wheel, and the upper die is screwed with the upper worm wheel. The upper punch holder is moved up and down together with the clamp to increase or decrease the seating pressing force of the upper stamping punch on the upper punch table. Therefore, when the lower stamping punch or the upper stamping punch is replaced, a large rotation torque is required. Up and down movement of the lower punch holder or the upper punch holder can be performed with a small effort, and work efficiency is improved.

According to a second aspect of the present invention, the die holder is a pair divided into two on a vertical line of a mold axis, and at least one of the die holders is pivotally supported by one of the divided outer edges so as to be openable and closable, and the other is provided with the other. A coupling member for coupling the pair of die holders is provided at the divided outer edge, and the coining die is detached from the pair of die holders by opening the coupling member.

According to the present invention, the die holder is divided into two parts on the vertical line of the mold axis, the pair of die holders is pivotally supported so as to be openable and closable, and a connecting member is provided to open the connecting member of the pair of die holders. As a result, the coining die is detached from the pair of die holders, so that when replacing the coining die, only the coining die can be taken out without taking out the pair of die holders outside the machine. Efficiency is improved.

According to a third aspect of the present invention, the lower punch holder is provided with notches at least at two equally spaced locations on the circumference of a flange portion bulging below the concave groove, and the lower clamp is provided above the concave groove. The flange is provided with a notch so that the remaining flange portion of the lower punch holder can be inserted in the mold axis direction, and the lower punch holder and the lower clamp are relatively rotated so that the phase between the flange portion and the notch is formed. Is adjusted so that the lower punch holder can be attached to and detached from the lower clamp in the form of a bayonet.

According to the present invention, a notch is provided in the flange portion below the lower punch holder and the flange of the lower clamp, and by rotating the lower punch holder, the remaining flange of the lower clamp and the lower portion of the lower punch holder are formed. The bayonet type is designed to be selectively detachable from the rest of the flange, so when replacing the lower stamping punch, the housing, lower punch stand, lower punch holder, lower clamp, stamping punch, etc. are integrated into the outside of the machine. The lower punch holder can be pivotally disengaged and removed, and only the lower impression punch can be taken out without any extra work. This can be done with a small amount of labor and the work efficiency is improved.

According to a fourth aspect of the present invention, the upper punch holder is provided with a notch at least at two equally spaced locations on the circumference of a flange portion bulging above the concave groove, and the upper clamp is provided at a position below the concave groove. The flange is provided with a notch so that the remaining flange portion of the upper punch holder can be inserted in the mold axis direction, and the upper punch holder and the upper clamp are relatively rotated to adjust the phase between the flange portion and the notch. Is adjusted so that the upper punch holder can be attached to and detached from the upper clamp in the form of a bayonet.

According to the present invention, a notch is provided in the flange portion above the upper punch holder and the flange of the upper clamp, and the upper punch holder is rotated to rotate the remaining flange of the upper clamp and the upper portion of the upper punch holder. Since the bayonet type is designed so that it can be selectively detached from the rest of the flange, when replacing the upper stamping punch, the upper punch stand, upper punch holder, upper clamp, upper stamping punch, etc. are integrated and left outside the machine. Without taking out, the upper punch holder can be rotated and removed to take out only the upper impression stamp, so that it can be done with a small amount of labor and work efficiency is improved.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front sectional view of a center section of a mold around a lower coining punch and an upper coining punch of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 showing a B section, FIG. 4 showing a C-C section of FIG. 1, FIG. 5 showing a D-D section of FIG. 4, and a perspective view of a lower impression punch, a lower punch holder, and a lower punch table. Will be described with reference to FIG.

The same parts as those in FIGS. 1 to 7 showing the prior art are denoted by the same reference numerals, and the description thereof will be omitted. First, the lower coining punch related will be described.

At the center of the bolster 102, a lower impression punch 106 is placed on the upper seating surface, and the larger diameter portion 1a and the middle diameter portion 1 are positioned from below.
b, a lower punch table 1 comprising a stepped cylinder having a small diameter portion 1c is disposed. The lower punch table 1 is positioned by housings 2A and 2B divided into two parts in a large diameter 1a, and a key 3 is provided.
And is held movably up and down.

The housing 2A on the fixed side is fixed on the bolster 102 by a plurality of bolts 4.
And two forked hinge parts 2Aa, 2A
Ab is formed, and a pin hole 2Ac is perforated in the right hinge portion 2Aa in the vertical direction with the center on the division surface substantially as a center,
A pin hole 2Ad is bored in the left hinge portion 2Ab in a vertical direction away from the division surface.

The hinge 2Ba, 2Bb which slides between the hinges 2Aa, 2Ab on both sides of the fixed housing 2A is formed on the rotating housing 2B. And the pin 6 inserted through the pin hole 2Ac. The pin 6 has a bolt 7 horizontally inserted from the front side of the hinge portion 2Ba screwed into a screw hole 6a threaded on the pin 6, and tightening the bolt 7 creates a gap in the inner surface of the pin hole 2Ac. Pressed so that there is no.

The hinge 2Bb on the rotation side of the housing 2B has a groove 2Bc formed by two branches opposing the two branches of the hinge 2Ab of the housing 2A. On the other hand, the pin 8 inserted into the pin hole 2Ad of the hinge 2Ab of the housing 2A
The swing frame 9 is pivotally supported. And seat bolt 1
1 is screwed into a screw hole 9a threaded on the front side of the swinging top 9 and inserted into the horizontal groove 2Bc of the housing on the rotating side, the seat surface of the bolt is engaged with the side surface of the hinge part, and the bolt 11 is tightened. Accordingly, the split surfaces of the two-part housings 2A and 2B are brought into close contact with each other by the pin 6 being pressed against the inner surface of the pin hole 2Ac, and the center of the lower punch table 1 is secured.

A tapered hole 13a is fitted to the tapered portion 106b of the lower coining punch 106 mounted on the seating surface of the lower punch table 1 in the small diameter portion 1C at the upper end of the lower punch table 1, and a concave groove 13b is formed in the outer periphery. Is fitted in the lower punch holder 13.
The flange-shaped portion that bulges below the concave groove 13b has a circumference of 6
Three places are cut out every other equally spaced part 13
c. Middle diameter part 1b of center of lower punch stand 1
A lower clamp 14 having a width slightly smaller than the notched width with which the remaining flange portion 13c of the lower punch holder 13 engages, and having a male screw 14b threaded on its outer periphery is used to move the lower clamp 14 by the key 15 in the vertical direction. Are movably fitted to

Therefore, the lower punch holder 13 and the lower clamp 1
The engagement between the collar portion 13c and the jaw portion 14a with the fourth member 4 is made by bayonet-type fitting in which one of them is rotated by 1/6 of the phase with the phase of the notch 13c or 14a. Further, a ball plunger 12 protruding inward and downward from the jaw portion 14a of the lower clamp 14 is provided so that when the engagement phase coincides with the ball contact 13d on the outer side of the flange portion 13c of the lower punch holder 13, it is fitted. Has become.

The female screw of the lower worm wheel 16 is screwed to the male screw 14b of the lower clamp 14. Further, a lower worm bracket 17 is fastened to the stepped portion between the large diameter portion 1a and the middle diameter portion 1b of the lower punch base 1 with a bolt, thereby restricting the axial movement of the lower worm wheel 16 and lowering the lower worm wheel. A lower worm shaft 19 having a wrench hole on an end surface is rotatably supported by a bearing. Therefore, by inserting the handle into the wrench hole of the lower worm shaft 19 and rotating the lower worm 18, the lower worm wheel 16 is prevented from moving up and down, and is rotated.
4. The lower punch holder 13 is moved up and down, and the lower stamping punch 106 is separated from the seating surface of the lower punch base 1 or pressed.

The coining die 109 is a divided die holder 2
It is held in a state where the upward movement is prevented by the heaters 2A and 22B. The coining die 109 is prevented from rotating by the pin 20 on the die holder 22A.
Furthermore, one half 21A of the half locking plate having the flanges 21Aa and 21Ba bulged to the upper end circumference with the donut disk being halved about the center is provided on the upper surface of the divided housing 2A, and the other 21B is mounted on the housing 2B. The housing is fastened to the upper surface of the housing so as to form a disk concentric with the housing when integrally connected.

The die holder is provided with locking plates 21A and 21B.
Inner jaw 22A engaging with the flanges 21Aa, 21Ba of
a, 22Ba are aligned and held. The dividing line of the housing and the locking plate and the dividing line of the die holder are arranged orthogonally. Die holder stamping die 1
09 between the worm bracket 17 and two rings 2
6, 27 are interposed. Both are prevented from rotating by a pin 28 and are attached to each other by a plurality of compression springs 29 interposed between the rings. The upper ring 27 prevents the coining die 109 from descending, and the lower ring 26 Assists the descent when the punch table 1 is lifted by the knockout 113.

The die holders 22A and 22B are shaved in the lower half at the hinge portion 22Ab of the die holder 22A and the upper half at the hinge portion 22Bb of the die holder 22B on the turning fulcrum side (left side in FIG. 5). The housings 2A are pivotally connected to each other by pins 23 implanted in the protruding portions 2Ae of the housing 2A so that they can be opened and closed with each other. The other (right side) fastening portion is formed in a fork 22Ac that opens horizontally in the die holder 22A, and the die holder 22B
Is formed in a fork 22Bc which also opens horizontally. A pin 31 is vertically inserted into 22Bc, and a turning frame 32 is pivotally supported so as to be horizontally rotatable. A bolt 33 with a seat is screwed into a screw hole provided at a right angle to the pin 31 of the rotary frame 32, and is inserted into the horizontal opening of the bifurcated portion 22Ac of the die holder 22A.
And the two divided die holders are fastened together.

Further, at the pivotal side of the die holders 22A and 22B, inclined contact surfaces 22Ad and 22Bd which define the opening angle of the die holder are formed on the end faces. A stopper 36 having a V-shaped contact surface fastened by a bolt to the protrusion 2Ae of the fixed-side housing 2A is established, and the contact surface 22A is opened when the die holders 22A and 22B are opened.
d, 22Bd are in contact with each other to define the opening angle.

Next, the upper punch related portion will be described.

The mounting plate 41 fixed to the lower surface of the slide 121 has two T-shaped liners 4 in the front-rear direction (FIG. 1) of the lower surface.
2 are mounted in parallel, and two T-shaped grooves 4
3a is formed, and a disk-shaped centering substrate 43 to be engaged with the liner 42 is provided in a suspended state.
The substrate 43 has a conical surface 43b whose side surface has a diameter reduced downward.
Is formed. Blocks 44A, 44B provided on the mounting plate 41 at four equal positions of two places in front and two places in back,
The tightening bolts 46A, 46B, 46C, 46D screwed on the base plates 43C and 44D and facing the center direction of the base plate 43 press the conical surface 43b, so that the base plate 43 is attached to the mounting plate by upward component force generated on the inclined surface. 41 is adhered.

The two blocks 44A and 44B of the previous example are 2
By pulling out one of the bolts fixed to the mounting plate 41 with the mounting bolts, each can be opened outward. The two rear blocks 44C and 44D are fixed to the mounting plate 41 by two mounting bolts so that they cannot be opened. These four tightening bolts 46A, 46B, 46C, 46
D enables fine centering adjustment of the upper coining punch.

The substrate 43 has a stepped cylinder having a large diameter portion 47a and a small diameter portion 47b at the center, and an upper punch table 47 whose lower surface is a seating surface of the upper impression stamp 126 is fixed by bolts. The lower punch 106, the lower punch holder 13, the lower clamp 14, the lower worm hole 16, which is screwed with the lower clamp, the lower worm bracket 17, the lower worm 18, the upper stamping punch 126 having the same configuration as the lower worm shaft 19, and the upper punch. Holder 48, upper clamp 49, upper worm wheel 51, upper worm bracket 52, upper worm 53, upper worm shaft 5 screwed with upper clamp 49.
4 are arranged upside down. However, the worm bracket 52 is attached to the substrate 43. The attachment and detachment of the upper punch holder 48 and the upper clamp 49 are also of a bayonet type. Like the lower clamp 14, the upper clamp 49 can be moved up and down in the axial direction by a key 56 attached to the upper punch table 47 in the axial direction.

A procedure for replacing the lower coining punch 106, the coining die 109, and the upper coining punch 126 by changing the type of coin-shaped work to be coined in the present invention having such a configuration will be described.

First, in order to replace the coining die 109, the upper coining punch 126 is locked at the uppermost end by a toggle mechanism to open the coining punch. Bolt with seat for fastening die holder 3
3 is loosened, and the seat bolt 33 is pivoted about the pin 31 to remove it from the fastening portion 22Ac of the die holder 22A. The divided die holders 22A and 22B are opened right and left about the pin 23, and the contact surfaces 22Ad and 22Bd for regulating the opening on the rotation center side of the die holder are brought into contact with the V-shaped slope of the stopper 36. The coining die 109 is released from the restraint, is lifted by the ring 27 by the force of the spring 29, and the lower coining punch 106 is disengaged from the cylindrical portion 106a. Thereby, the coining die 109 can be removed.

Next, in order to replace the lower stamping punch, insert the L-shaped handle into the hexagonal hole for the handle of the lower worm shaft 19 in the state where the die holder is opened and the stamping die is removed, and insert the lower stamping punch in the specified direction (lower stamping punch). (The direction in which 106 rises), and the worm 18 turns. Accordingly, the lower worm wheel 16 is rotated. Since the lower worm wheel 16 is sandwiched vertically by a lower worm bracket 17 fixed to the lower punch table 1 and the axial movement of the mold is restricted, the lower clamp 14 guided in the axial direction by the key 15 is provided. Is moved upward without rotating. Thereby, the lower punch holder 13 is pushed up by the upper surface of the flange 14a of the lower clamp 14. The lower stamping punch 106 is pushed up together with the lower punch holder 13 because the tapered portion 106b of the lower stamping punch 106 is strongly drawn by the tapered hole 13a of the lower punch holder 13 and is tightly fitted by the wedge effect.

When the seating surface of the lower impression punch 106 is lifted, the upper punch holder 13 and the lower clamp 14 lose their vertical frictional force, and the lower punch holder 13 can be easily rotated. Then, the lower punch holder 13 is rotated by 60 ° (１ ／ of the circumference) to thereby lower the lower punch holder 1.
3 is out of phase with the jaw 14a of the lower clamp 14, the engagement is lost, and the lower coining punch holder 1
By detaching 3 from the lower clamp 14, the lower coining punch 106 can be taken out upward. It should be noted that the lower coining punch 106 has a tapered hole 13 a of the lower punch holder 13.
When the lower punch holder 106 is taken out in a state in which the lower punch holder 106 is placed on the table, the lower stamping punch 106 is pressed and pushed downward, thereby releasing the taper fitting and removing the lower stamping punch 106. Can be. The lower coining punch 106 is replaced with the upper end face and the diameter of the next coin corresponding to the next coin. Tapered portion 106 of normal lower coining punch 106
b does not change.

A new lower stamping punch 106 is mounted on the lower punch table 1 to cover the lower punch holder 13, and the protruded 1/3 circumferential width flange 13 d of the lower punch holder 13 is attached to the lower clamp 14 Pushed in phase with the notch between the jaws having a circumference of / 6, and rotated by 60 degrees about 1/6 of the circumference, and the ball plunger 12 provided on the lower clamp 14 was fitted into the contact 13d of the lower punch holder 13. Make the phase of the jaw coincide with that of the jaw. The worm shaft 19 is reversed by the handle, and the lower clamp 14 is lowered by the reverse rotation of the lower worm 18 and the lower worm wheel 16. The lower surface of the lower coining punch 106 is firmly pressed against the upper surface of the lower punch table 1 and is seated.

Next, the cylindrical portion 106 of the lower coining punch 106
A coining die 109 having an inner diameter adapted to the changed diameter of a is selected, fitted to the lower coining punch 106, and placed on the ring 27 pushed up by the spring 29. The divided die holders 22A and 22B are closed, and the coining die 109 is closed.
Is pressed down so that the respective anchoring portions are fitted together, and the die holder 2
2A and 22B are combined, and the bolt 33 with a seat for fastening is turned and inserted into the groove of the forked portion of the fastening portion 22Ac of the die holder 22A, and the bolt seat surface is brought into contact with the side surface of the fastening portion 22Ac to be strongly tightened and fixed. It is.

Next, in order to replace the upper coining punch, a handle is inserted into the hexagonal hole of the upper worm shaft 54, and the upper coining punch 126 and the upper punch table 47 are turned in a direction in which they are separated from each other. By turning the upper worm 53 and the upper worm wheel 51, the upper clamp 49 guided by the key 56 is moved in the axial direction of the upper punch table 47. When the upper punch holder 48 is pushed down and the upper stamping punch 126 is separated from the upper punch table 47, the upper punch holder 48 is rotated by 1/6 of 60 °.
By rotating, the upper punch holder 48 and the upper impression stamp 126 are separated by the bayonet method. When the upper stamping punch 126 is taken out in close contact with the tapered hole of the upper punch holder 48, the upper punch holder 48 is placed on a table and the upper stamping punch 126 is pressed to fit the tapered portion. The upper pressure punch 126 is released and is pushed out.

The upper stamping punch 126 corresponding to the lower stamping punch 106 is selected, and the upper stamping punch 126 is strongly seated on the upper punch table 47 by the reverse procedure of the removal as in the case of the lower stamping punch. When the slide 121 is gradually lowered and the cores of the upper and lower dies (upper / lower stamping punches, stamping dies) do not match, the bolts 46A, 46B, 46C, 46D are used.
Is adjusted, the misalignment can be corrected.

When chips accumulate around components related to the lower coining punch by a large number of coining processes, or when cleaning is performed periodically, first, as described above, the die holder 22 is used.
A and 22B are released, and the engagement between the die holders 22A and 22B and the flange 21Ba of the half-stopped locking body 21B is released. Loosen the bolt 11 with the seat, rotate the pin 8 as a center, and remove it from the fork 2Bb of the fastening portion of the housing 2B. Bolt 7
To rotate the housing 2B about the pin 6 to make the housing 2B half-open (the position of the phantom line in FIG. 2). Thus, chips around the lower punch holder 13, the lower clamp 14, the worm 18, and the like can be cleaned.

When the cleaning is completed, the die holders 22A and 22B are engaged with the flange 21Ba of the half locking member 21B while closing the housing 2B. The seated bolt 11 is rotated and inserted into the groove of the forked portion 2Bb of the housing 2B, and the seat surface of the bolt 11 is brought into contact with the side surface of the forked portion and tightened. Then, while closing the die holders 22A and 22B, the respective soldering portions with the coining die 109 are engaged. After fully closed, the seat bolt 33 is rotated to fork part 22A of the die holder 22A.
The die holder is tightly fixed by inserting the bolt into the groove of c and abutting the seating surface of the bolt against the side surface of the forked portion, thereby completing the operation.

[0055]

According to the structure described above, the following effects can be obtained.

According to the first aspect of the present invention, when replacing the lower coining punch or the upper coining punch, the wedge action of the tapered surface with the lower punch holder or the upper punch holder and the elastic deformation of the screw portion cause a large rotation to remove the screw portion. Although torque was required, the vertical movement of the lower punch holder or upper punch holder
Due to the high reduction ratio of the worm wheel, it can be performed with a small turning torque, and the work efficiency is remarkably improved.

According to a second aspect of the present invention, the coining die is released from the die holder by dividing the die holder into two and opening at least one of the die holders around the pivot shaft.
When replacing the coining die, it is not necessary to remove the heavy die holder outside the machine, and it is possible to remove only the coining die and replace it with only a small amount of labor, thereby improving the work efficiency.

According to a third aspect of the present invention, the engagement and disengagement between the lower punch holder and the lower clamp is performed by a bayonet method. Therefore, when replacing the lower pressure stamp, the housing, the lower punch table, the lower punch holder, the lower clamp, the lower pressure punch, etc. It is not necessary to take out the lower punch holder as one unit, and it is sufficient to take out only the lower pressure stamping punch by rotating and detaching the lower punch holder, so that it is possible with a small amount of labor and the work efficiency is improved.

According to the fourth aspect, since the engagement and disengagement of the upper punch holder and the upper clamp is performed by a bayonet method, the upper punch stand, the upper punch holder, the upper clamp, the upper pressure stamp and the like are integrated when replacing the upper pressure stamp. It is not necessary to take out the upper punch holder as it is, and it is sufficient to take out only the upper stamping punch by rotating and detaching the upper punch holder, so that it can be performed with a small amount of labor and the working efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front cross section of a center cross section of a mold according to the present invention.

FIG. 2 is a diagram showing a cross section taken along line AA of FIG. 1;

FIG. 3 is a diagram showing a BB cross section of FIG. 1;

FIG. 4 is a diagram showing a CC section of FIG. 1;

FIG. 5 is a view showing a DD section of FIG. 4;

FIG. 6 is a view showing a bayonet engaging and disengaging mechanism of a punch holder and a lower clamp, wherein a is a perspective view of a lower punch holder, b is a perspective view of a lower stamping punch, and c is a perspective view of a lower clamp fitted to a lower punch table. It is sectional drawing of a figure.

FIG. 7 is a diagram showing a front cross section of a mold section according to the prior art.

FIG. 8 is a diagram showing a cross section taken along line EE of FIG. 7;

FIG. 9 is a sectional view taken along line FF of FIG. 7;

FIG. 10 is a sectional view taken along line GG of FIG. 7;

11 is a sectional view taken along line HH of FIG.

12 is a view taken in the direction of arrows JJ in FIG. 7;

FIG. 13 is a sectional view taken along the line KK of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower punch table 2A, 2B Housing 13 Lower punch holder 14 Lower clamp 16 Lower worm wheel 18 Lower worm 19 Lower worm shaft 22A, 22B Die holder 29 Compression spring 36 Stopper 43 Substrate 44A, 44B, 44C, 44D Block 47 Upper punch table 48 Upper punch holder 49 Upper clamp 51 Upper worm wheel 53 Upper worm 54 Upper worm shaft 106 Lower impression punch 126 Upper impression punch

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B21J 13/03 B21J 13/03 B30B 15/02 B30B 15/02 C F-term (Reference) 4E050 FA01 FA03 FB01 FB05 FB06 FC01 4E087 AA10 CA17 EC01 EC11 EC46 EC54 ED22 ED28

Claims (4)

[Claims] 1. The upper and lower surfaces of a coin-shaped blank are stamped with a lower die provided on a bolster and an upper die provided on a slide capable of reciprocating up and down so as to face the lower die. A die of a coining press machine, wherein the lower die is
A lower punch table which is fitted in a hole of a housing provided upright on the bolster upper surface and which can be moved up and down, and a lower pressure stamp which is formed at a lower end of a tapered portion which is reduced in diameter upward and is seated on an upper end of the lower punch table. A punch, a lower punch holder having a tapered hole that can be fitted to the tapered portion of the lower coining punch and a circumferential concave groove formed on the outer periphery; A lower clamp formed with a flange capable of meshing with the concave groove of the lower clamp and movable only in the vertical direction together with the lower punch holder; a lower worm wheel threaded with a female screw to be screwable with a male screw of the lower clamp; A lower worm shaft rotatably supported by the lower worm wheel, a die holder fixed to the upper end of the housing so as to surround the lower coining punch, and a coin-shaped work after coining is formed into a predetermined outer peripheral shape. Inside The a coining die capable being engaged removably in the die holder has, by rotating the lower worm wheel by rotating the lower worm shaft,
The lower punch holder is moved up and down together with the lower clamp to make the lower stamping punch detachable. The upper die has an upper punch table fastened to the lower surface of a slide member, and a tapered portion which is reduced in diameter downward. Formed at the upper end and seated at the lower end of the upper punch table, an upper punch holder having a tapered hole that can be fitted to the tapered portion of the upper punched punch and a circumferential groove formed on the outer periphery. A male screw is threaded on an upper part, a flange is formed on an inner peripheral lower part so as to be able to mesh with a concave groove of the upper punch holder, and an upper clamp movable only in the vertical direction together with the upper punch holder; An upper worm wheel in which a female screw is threadably threadably engaged with a male screw; and an upper worm shaft rotatably supported by the upper worm wheel. The upper worm shaft is rotated to rotate the upper worm shaft. The wheel is rotated, coining dies, characterized in that said upper punch holder is vertically moved together with the upper clamp and is detachably mountable to the upper coining punches. 2. The die holder is a pair divided into two parts on a vertical line of a mold axis, and at least one of the die holders is pivotally supported at one divided outer edge so as to be openable and closable, and a pair of die holders is formed at the other divided outer edge. The stamping die according to claim 1, wherein a joining member for joining the stamping die is provided, and the stamping die is separated from the pair of die holders by opening the joining member. 3. The lower punch holder is provided with a notch at at least two equal parts on a circumference of a flange portion swelling below the concave groove, and the lower clamp is provided with a flange above the concave groove. The remaining flange portion is provided with a notch so that it can be inserted in the mold axis direction, and the lower punch holder and the lower clamp are relatively rotated to adjust the phase of the flange portion and the notch, thereby forming a bayonet form. The coining die according to claim 1, wherein the lower punch holder is detachable from the lower clamp. 4. The upper punch holder is provided with a notch at least at two equally spaced locations on a circumference of a flange portion bulging above the concave groove, and the upper clamp is provided with a flange below the concave groove on the upper punch holder. The remaining flange portion is provided with a notch so that it can be inserted in the mold axis direction, and the upper punch holder and the upper clamp are relatively rotated to adjust the phase of the flange portion and the notch, thereby forming a bayonet type. 4. The coining die according to claim 1, wherein the upper punch holder is detachable from the upper clamp.