JPH018262Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for producing short metal fibers.

Needle-shaped metal short fibers such as steel are used as articles that are mixed into plastic materials such as concrete and mortar to improve or modify their physical properties such as strength. Conventionally, such short metal fibers have been produced by cutting wire rods into predetermined lengths or finely chopping thin slit plates, but these methods require a large number of processing steps and require highly processed materials as raw materials. There was a problem in that the manufacturing cost was high due to the use of this method.

For this reason, the inventor of the present invention filed a patent application in 1983-
In No. 102310, we proposed a device that uses a steel block as a material and creates acicular short fibers by directly scraping the surface of the block with a milling cutter. With this device, it is possible to reduce costs by using materials with a low degree of machining, such as blooms and slabs.Moreover, during cutting, the front end of the steel block is clamped while moving the steel block forward and backward on a horizontal table. Since the cutter is structured to move along the end face of a fixed steel block, it is possible to create a device with less vibration that is suitable for heavy cutting.

However, with the above manufacturing equipment, one steel block is cut when the cutter moves back and forth, and the cutter is fed blankly during the return movement, so there is a drawback that productivity cannot be sufficiently increased due to time loss during the return movement.
In addition, the steel block is placed on a fixed table, which is moved forward when the cutter reciprocates and retreated when it returns, increasing the load on the feed screw and requiring the feed screw to be a forward-reverse screw. The drawback was that it was complicated. In addition, the steel block was made by cutting a piece of steel by continuous casting, but in this case, the short side (thickness) of the piece of steel, which becomes the long side (width) of the steel block, was used.
Although it is approximately constant, the long side (width) of the steel piece, which becomes the short side (thickness) of the steel block, varies depending on the cutting operation. Therefore, when cutting a steel block with the short side vertically as described above, the variation in thickness causes a mismatch with the blade width of the cutter, resulting in the production of short fibers at the end due to the specifications, and it is necessary to avoid this. Therefore, there was a problem in that complicated preprocessing for size adjustment was required.

In addition, Japanese Utility Model Application Publication No. 54-32888 proposes an apparatus for producing short metal fibers using a milling cutter. This device uses a double-headed milling cutter to cut blocks in the outward and return passes.
It is true that the productivity is better than the device proposed by the inventor mentioned above. However, in this device, a single raw material block is arranged with the short sides on the left and right (horizontally long), the two cutters are movable up and down along the main axis, and the work table is equipped with a sliding block that is moved back and forth by a feed cylinder. A table is provided, and upper and lower clamps are provided on this table to fix the upper and lower sides (thickness direction) of the raw material block in cooperation with the rollers, and upper and lower clamps are installed on the table behind the sliding table to fix the thickness of the raw material block in cooperation with the rollers. The structure was such that it was equipped with a cylinder to prevent it from receding, which fixed it in the horizontal direction.

Therefore, there was a drawback that the manufacturing procedure was extremely complicated. In other words, even one-way cutting can be done by: adjusting the cutting tool - raising and lowering the double-head milling cutter - unfixing the block using the back-back prevention cylinder - fixing the block using the upper and lower clamp cylinders - moving the sliding table using the feed cylinder - work table using the back-back prevention cylinder The procedure is as follows: Fixing the block to the block - Unfixing the block using the upper and lower clamp cylinders - Returning the slide table to its original position using the feed cylinder - Making the slit with the cutting tool - Moving the cutting head, and this process must be repeated during forward movement. It was extremely inefficient.

Furthermore, each time the thickness of the block changes, the cutting tool must be adjusted to the spacing that corresponds to the fiber length, and even in that case, fibers that deviate from the specified fiber length are likely to be manufactured from the end portions, which reduces the yield of good products. Furthermore, as is clear from the work procedure above, the mechanism becomes complex even though only a single block is used, and the cutting head travels a long distance, requiring a large amount of power. Ta.

The purpose of the present invention is to further improve the above-mentioned short metal fiber manufacturing apparatus, and to provide a practical apparatus that can mass-produce short fibers with uniform fiber length with high productivity and has a simplified structure. do.

To achieve this objective, the present invention has changed the idea of the conventional fiber cutting method, in which the raw material block is placed horizontally (with the thickness direction up and down) on a work table, and the metal block is placed vertically. (width direction is up and down) and by cutting the end face,
Regardless of changes in the thickness of the metal block, short fibers of uniform length can always be obtained, and multiple metal blocks and cutters are used in parallel.
By alternately swinging the metal block in accordance with the reciprocating movement of the cutter while feeding the metal block in a fixed amount, it is possible to efficiently produce short fibers on both the forward and return trips of the cutter.

In other words, the present invention is an apparatus that uses multiple cutters to cut a metal block to produce short fibers, in which a fixed frame is provided in parallel with a reciprocating cutting head that holds each of the cutters vertically, and The frame has a window hole through which the front ends of a plurality of raw material blocks with their short sides facing up and down are inserted in parallel at a predetermined interval, and a roller that supports the lower surfaces of both raw material blocks in the lower area of the window hole. A clamper is provided which presses and fixes both raw material blocks alternately against the side wall of the window hole, and a cart is provided which is movable along a guide rail extending rearward from the fixed frame between the window holes, and both sides of the cart are provided. The swinging arms are pivotally supported by their upper ends, and each swinging arm is operated alternately by a swinging cylinder fixed to a trolley, and each swinging arm is connected to the rear ends of both raw material blocks. It is characterized in that the hanging members are each supported.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show an outline of the device of the present invention.
, a cutting head 2 disposed at a predetermined distance from the fixed frame 1 , and a feeding device 3 mounted on a guide rail 5 extending rearward from the fixed frame 1 .

Therefore, the fixed frame 1 has window holes 6, 6' through which a plurality of (two in the drawing) raw material blocks A, A' are inserted in parallel at a predetermined distance from each other.
Roller mechanisms 7 and 8 for supporting the lower surfaces of the raw material blocks A and A' are provided in the area below and behind the window holes 6 and 6', respectively. In the side area, raw material blocks A,
Clampers 10 and 10' are provided to clamp and fix the vicinity of the front end of A' with the receiving surfaces 9 and 9'.

Next, the cutting head 2 has a column 12 that is slidably mounted on an oblong bed 11 parallel to the fixed frame 1 via a meshing part 21, and this column 12 has a column 12 that is attached to the window hole 6 of the fixed frame 1. ,6'
A plurality of thrust bearings 13 are provided at intervals that substantially coincide with each other, and each thrust bearing 13,
13' has the same number of cutters 14 (two in the drawing),
14' are rotatably held by vertical shafts 15 and 15', respectively. And each cutter 14,1
4' in opposite directions, each vertical axis 15,
15' is provided with V pulleys 16, 16',
A rotary motor 17 is provided on the back of the main body, and gears 18, 18' are attached to the output shaft of this motor and a free shaft parallel to the output shaft, and a drive corresponding to the V-pulley 16, 16' is attached to each gear shaft. Side V pulley 19,
19' and each pair of V-pulleys 16, 19,
Wrap V-belts 20 and 20' between 16' and 19',
The transmission mechanism and the rotation motor 17 are used to rotate each cutter 14, 14' at variable speeds.

Also, attach the cutters 14, 14' to the fixed frame 1.
In order to reciprocate in parallel with
is driven by a moving motor 38.

Each cutter 14, 14' is made up of a plurality of cutter bodies 141 arranged in parallel and mounted on the same shaft, and each cutter body 141 has a cutting edge rake angle of, for example, a negative angle of 0 to -30 degrees, and a helix angle of 0 to -30 degrees. It is made up of a group of carbide chips with an angle of, for example, 0 to -60°.

Next, the feeding device 3 includes a truck 22 that straddles the guide rail 5, and a plurality of monorail-like position adjustment mechanisms 4, 4' provided on the truck 22 (two on both sides in the drawing). The trolley 22 has guide rollers 24, 24 on both sides for sandwiching the guide rail 5 from the upper and lower surfaces and running along it, and a female thread cylinder 25 is provided in the middle part, and the female thread cylinder 25 has a threaded cylinder 25. A feed screw 26 installed parallel to the guide rail 5 is screwed together, and the rear end of the feed screw 26 is driven by a feed motor 27 to move the carriage 22.
is a fixed amount per cutting cycle (for example, 0.3 mm)
Progress is being made little by little.

On the other hand, as shown in FIGS. 2 and 3, the position adjustment mechanisms 4, 4' have their upper ends pivoted on pivots 28, 28' installed on the overhanging part 221 of the truck 22,
After that, the swinging arm 2 hangs down to the side of the truck 22.
9 and 29' are fixed to the sides of the truck 22, and the tip of the piston rod 31 is connected to the swing arms 29 and 29, respectively.
Swing cylinders 30, 30' connected to 9';
As shown in FIG. 4, each of the swinging arms 29, 29' is composed of a suspension member 35 having a recessed portion 34 at the rear removably and drivably attached to a spherical seat 32 provided at the bottom of each swinging arm 29, 29'. On the front side, there are raw material blocks A, A' and an end plate 3 fixed by bolts or welding.
There are 6.

Next, the operation of the device of the present invention will be explained.

The raw material blocks A and A' are loaded into the window holes 6 and 6' of the fixed frame 1 with their front ends in such a state that their longitudinal cross-sections, that is, their short sides are at the top and bottom, respectively, and the rear parts in the length direction are inserted into these parts in advance. It is connected to the suspension member 35 by the fixed end plate 36, suspended by the feeding device 3 via the swing arms 29, 29', and is held horizontally as a whole.

Next, when the feed motor 27 is driven, the feed device 3 is moved forward along the guide rail 5 by the feed screw 26 and the female thread cylinder 25, and the position adjustment mechanisms 4, 4' are moved forward.
The raw material blocks A,
A' slides on the roller mechanisms 7 and 8, and the cutter 14,
It is fed forward by a fixed amount until it touches the blade at 14'.
This state is shown in FIG.
rotate at high speed in opposite directions.

Next, cut the raw material block on the side that does not match the cutting edge direction of the cutters 14, 14' (non-cutting side).
The swing cylinder 30' of the position adjustment mechanism 4' corresponding to A' is operated. In this way, the swinging arm 29' swings about the pivot 28', and the hanging member 35 is thereby indexed backward by a predetermined amount ₁ (for example, 5 mm), and the raw material block A' is moved to the position shown in FIG. The cutter 14' is held apart from the outer diameter of the cutter 14', and in this state its front end is fixed together with the other raw material block A by the clampers 10, 10'.

Next, when the moving motor 38 is driven, the cutting head 2 moves along the bed 11 and the cutter 1
4 and 14' begin to move parallel to the front surface of the fixed frame 1, and as shown in FIG. The main body 141 continuously creates and releases short fibers. At this time, the other raw material block A' is placed in the retracted position, so the other cutter 14' is idle.

Thus, when one cutter 14 reaches a position away from the other edge in the thickness direction of the raw material A and the other cutter 14' reaches an intermediate position, the clamper 10,
10' is moved and the fixation of the raw material block is released.
Next, as shown in FIG. A is a certain amount backwards
The raw material block A' is moved _back by the swing arm 29', and the raw material block A' is caused to project from the retreated position to a state where it contacts the outer diameter of the cutter 14'. Here, the clampers 10 and 10' are operated again, and the moving motor 3
If 8 is rotated in the opposite direction, the cutting head 2 will move backwards.
During this backward movement, one cutter 14 idles and the other cutter 14' contacts the raw material block A' to continuously generate short fibers in the same manner as described above. Note that ₁ = ₂ >.

In this way, when the cutter 14' separates from the raw material block A', one cycle of cutting is completed, and the clamper 1
After the feed of 0 and 10', the feed device 3 is moved forward by a fixed amount by the feed motor 27 as shown in Fig. 5D, and all raw material blocks A and A' are uniformly fed forward by a fixed amount, and the next cutting begins. The quantitative feed and position adjustment mechanism 4, 4' of the feed device 3 as shown in Fig. 5 A to D below.
By repeating the alternating oscillations, short fibers are produced in each of the forward and backward paths of the cutters 14, 14'.

According to the present invention described above, in an apparatus for cutting a metal block using a plurality of cutters to produce short fibers, a plurality of cutters 14, 1
A fixed frame 1 is provided in parallel with the cutting head 2 that holds each of the blocks 4' vertically and can freely move back and forth, and the front ends of a plurality of raw material blocks A and A' with their short sides facing up and down are fixed to the fixed frame 1. window holes 6, 6 inserted in parallel with an interval of , and the window holes 6, 6'
rollers 7 and 8 that support the lower surfaces of both raw material blocks A and A' in the lower region of the window, and clampers 10 and 10' that alternately press and fix both raw material blocks A and A' against the side wall of the window hole; Further, a cart 22 is provided which is movable along a guide rail 5 extending rearward from the fixed frame 1 between the window holes 6 and 6', and swing arms 29 and 29' are provided on both sides of the cart 22 at upper ends. The swinging arms 29, 29' are rotated alternately by swinging cylinders 30, 30' fixed to the trolley 22.
A plurality of raw material blocks are arranged in the longitudinal direction, that is, on the short side (thickness direction), so that the hanging members 35, 35 connected to the rear ends of both raw material blocks A, A' are supported by 9', respectively. The rear end of the cutter is suspended, and while a constant feed is applied to the raw material blocks, each raw material block is alternately swung in accordance with the horizontal reciprocation of the cutter to switch between the cutting position and the standby position. Since short fiber production is carried out through the process, the following excellent effects can be obtained.

a. In order to produce short fibers by using a raw material block in a vertically long cross section and moving the cutter along its thickness direction, that is, in the transverse direction, special methods such as cutting grooves with a cutting tool are used to cut the steel blocks, which have different thickness dimensions, due to the manufacturing process. Steel fibers of uniform length can be easily produced without the need for incidental tools or pretreatment.

b The fiber production efficiency per unit time is high because the horizontal movement distance of the cutting cutter during fiber production is short, and the steel fibers are produced by alternating two raw material blocks, which reduces the need for raw material replenishment. The number of setups is also small, and therefore production efficiency is high.

c. No need for a clamping mechanism in the vertical direction of the raw material block, no need for a tool to adjust the fiber length,
In addition, although two raw material blocks are used, only a single feeding mechanism 3 is required, and the mechanism on the cutter side is also simple, resulting in a simple device structure and low cost.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the short metal fiber manufacturing apparatus of the present invention, Fig. 2 is a partially cutaway side view thereof, Fig. 3 is a perspective view of the feeding device of the present invention, and Fig. 4 is a partially cutaway plan view showing an embodiment of the short metal fiber manufacturing apparatus of the present invention. FIGS. 5A to 5D, which are also partial cross-sectional views, are explanatory diagrams showing the short fiber manufacturing process using the apparatus of the present invention. In the drawing, 1 is a fixed frame, 2 is a cutting head, 3 is a feeding device, 4 and 4' are position adjustment mechanisms,
10, 10' are clampers, 14, 14' are cutters, 17 is a rotating motor, 22 is a trolley, 26 is a feed screw, 29, 29' is a swing arm, 30, 30' is a sliding cylinder, and 31 is a piston rod. , 35 indicate hanging members.

Claims (1)

[Scope of utility model registration request] In an apparatus for producing short fibers by cutting a metal block using a plurality of cutters, a fixed frame 1 is provided in parallel with a reciprocating cutting head 2 that holds a plurality of cutters 14, 14' vertically, respectively. The fixed frame 1 has window holes 6, 6' through which the front ends of a plurality of raw material blocks A, A' with their short sides facing up and down are inserted in parallel at a predetermined interval, and the window holes 6, 6'. Both raw material blocks A,
Rollers 7 and 8 that support the lower surface of A' and clampers 10 and 10' that alternately press and fix both raw material blocks A and A' against the side wall of the window hole are provided, and further,
a cart 2 that is movable along a guide rail 5 extending rearward from the fixed frame 1 between the window holes 6 and 6';
2 is provided, and swing arms 29, 2 are provided on both sides of this trolley 22.
9' is pivotally supported by its upper end, and each swing arm 29,
A swinging cylinder 30 with 29′ fixed to the trolley 22,
30' to operate alternately,
An apparatus for producing short metal fibers, characterized in that each swinging arm 29, 29' supports a hanging member 35, 35, which is connected to the rear end of both raw material blocks A, A'.