JPS6327888Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application of the invention) This invention is based on a bolt material (blank) in the process of manufacturing a bolt, which has a circular head (referred to as a cheese head). It is used in the field of manufacturing equipment for shearing parts into hexagonal heads that approximate the finished product.

(Prior Art) Fig. 2 shows the conventional technology of this type of bolt trimmer, in which 1 is a trimming die, in which a product discharge hole 2 is provided in the center, and a hexagonal cutting edge is provided at the tip edge of the discharge hole. The trimming die 1 is fixed to the machine frame 4 by bolts 5 in a fixed position. Reference numeral 6 denotes a ram that is slidably attached to the machine frame 4, and is moved near and far to the trimming die 1 by means of a crank mechanism 10 consisting of a drive shaft 7, a crank arm 8 that rotates integrally with the ram, and a connecting rod 9 connected thereto. The ram 6 is integrally provided with a hollow holder 11 for holding the bolt material b. 12
is the kick lever also installed on the machine frame 4,
The bolt material b held in the holder 11 is kicked out toward the die 1 side. 1
3 is a kick-out cam that connects the drive shaft 7 to the transmission section 1.
Rotated by 4.

To explain this operating order, the crank mechanism 10
, the ram 6 moves forward, and most of the periphery of the head c of the bolt material b held by the holder 11 is sheared by the cutting edge 3 of the trimming die 1, and the holder 11 is moved forward by the cutting edge 3 of the trimming die 1. At the point closest to (that is, the bottom dead center of the crank mechanism 10), the bolt material b is strongly kicked out toward the die 1 side by the kicking lever 12 operated by the kicking cam 13.
As a result, the remaining periphery of the head c is sheared by the cutting blade 3, the product is discharged from the discharge hole 2, and the sheared scum s falls downward. The reason why the holder 11 does not come into complete contact with the trimming die 1 in this way is to prevent damage to both, particularly to the trimming die 1.

By the way, the distance between the holder 11 and the trimming die 1 at the position where they face each other must always be maintained at an appropriate width. That is, it is necessary to constantly adjust the width l due to wear of the die cutting edge 3 due to long-term use, hardness and toughness of the bolt material b, and various other reasons.

In the prior art, a turnbuckle 15 is provided on the connecting rod 9 of the crank mechanism 10, and by operating the turnbuckle 15, the length of the connecting rod 9 is changed, and by changing the position of the bottom dead center of the crank mechanism 10, this can be achieved. The forward moving position of the ram 6, and thus the holder 1, is adjusted.

This adjustment structure has the following drawbacks.
That is, during the adjustment work, it is necessary to stop the crank mechanism 10, measure the adjustment amount in this state, and repeatedly operate and stop the crank mechanism 10 while inspecting the product one by one until the most adjusted position is reached.
The work is extremely difficult. Also, by adjusting the crank mechanism 10, the kicking lever 12
The timing will be different, and the kicking cam 13 will also need to be adjusted. Furthermore, since the crank mechanism 10 is housed deep inside the machine frame 4, it is very difficult to adjust it in the case of a small machine.

(Problems to be Solved by the Invention) The above-mentioned difficulties arise from the fact that the above-mentioned opposing width l is adjusted by operating the crank mechanism. The problem to be solved is to make it possible to adjust the width 1 outside of the mechanism.

(Means for solving the problem) In order to solve the above problem, this invention is the first
As shown in the figure, a ram 23 is provided on a trimming die 21 provided on a machine frame 20 to be reciprocated near and far by a crank mechanism 22, and a holder 24 for holding the bolt material b is integrally attached to this ram 23. At the same time, the holder 24 is attached to the trimming die 2.
At the point when it is closest to 1, hold bolt material b in holder 2.
Kick lever 25 that kicks out from 4 to the die 21 side
This bolt trimmer is equipped with a structure in which a trimming die 21 is attached to a machine frame 20 so as to be adjustable in distance relative to a holder 24.

(Function) If the trimming die 21 is moved closer to the holder 24 and attached to the machine frame 20, the width l between the opposing sides becomes narrower. On the contrary, trimming die 21
If it is moved away from the holder 24 and attached to the machine frame 20, the width l between the opposing sides becomes wider. During this adjustment work, there is no need to stop the drive of the crank mechanism 22 at all.

(Example) In FIG. 1, inside the machine frame 20 is a ram 23.
is horizontally slidably mounted, and behind it are a drive shaft 22a, a crank arm 22b, and a connecting rod 22c.
A crank mechanism 22 consisting of a connecting rod 2 and
The tip of 2c is pivotally attached to the ram 23. A holder 24 for holding the bolt material b is integrally provided at the tip of the ram 23.
A recessed part 26 is provided in the middle part of the recessed part 2.
One end 25a of the kicking lever 25 in 6
is designed to be able to reciprocate from side to side. The other end 25b of the lever 25 is in contact with a kicking cam 27, and the cam 27 is connected to the aforementioned drive shaft 22a via a transmission section 28 such as a transmission belt, so that they rotate in synchronization with each other. It's summery.

On the other hand, in the axial direction of the ram 23, a trimming die 21 is attached to the machine frame 20 in opposition to it.
The die mounting hole 29 is formed to be slightly longer than the die 21 in the axial direction so that the die 21 can move a required width in the axial direction. A screw hole 30 is drilled, and a hollow tubular adjustment screw 31 is screwed into the hole, and its tip presses the trimming die 21 and extends concentrically and approximately at the same time between the die 21 and the adjustment screw 31. diameter product discharge holes 32, 33
is inserted through the die 21, and a hexagonal cutting edge 34 is formed at the periphery of the tip of the product discharge hole 32 of the die 21.
Numeral 35 is a bolt for tightening and fixing the die 21 from above.

Its operation order is almost the same as the prior art,
When the holder 24 is closest to the die 21 and a predetermined width l is reached between the opposing faces, and most of the periphery of the head c of the bolt material b has been sheared by the cutting blade 34, the kicking cam 27 is activated. The bolt material b is kicked out toward the die side by the kicking lever 25, thereby forming the head c into a completely hexagonal shape, and the product passes through the discharge holes 32 and 33 to the outside. At the same time, the sheared debris s falls downward. During product processing, the above-mentioned opposing gap
To adjust l, of course, use adjustment screw 3 from the outside.
All you have to do is operate 1.

(Effect) According to this invention, the width l between the opposing trimming die and the holder that holds the bolt material can be adjusted in the process of processing the bolt material into a product without stopping the drive of the ram operated by the crank mechanism. Since it can be adjusted, processing efficiency will not be reduced, and since the adjustment allowance can be manipulated while inspecting the processed product, it can be adjusted accurately and quickly.

Since the trimming die is attached near the end of the machine frame, it can be adjusted from the outside, making the adjustment operation that much easier.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing an embodiment of this invention, and FIG. 2 is a longitudinal side view of a conventional example. 20... Machine frame, 21... Trimming die, 22
... crank mechanism, 23 ... ram, 24 ... holder, 25 ... kicking lever.

Claims (1)

[Scope of utility model registration request] Opposing the trimming die provided on the machine frame, a ram is provided which is reciprocated near and far by a crank mechanism, and a holder for holding the bolt material is integrally provided on this ram. A bolt trimmer equipped with a kick-out lever that kicks the bolt material from the holder to the die side when the bolt material comes in contact with the holder, and in which the trimming die is attached to the machine frame so that it can be adjusted in distance and distance from the holder.