JPH066207B2 - Method and apparatus for forming steel bar with small slope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended to form a steel bar material having a predetermined thickness and length to form a bar steel material front half and a flat part having a predetermined length. As a result, it is necessary to form a long and small slope portion having a predetermined length between the large diameter rear portion and the large diameter rear portion. For example, the present invention relates to a forming method and an apparatus for highly efficiently manufacturing a steel bar for forming a front radius rod of an automobile part using a die.

[Prior Art] Conventionally, the method of forming a steel bar requiring a gradient portion locally as described above has adopted a method in which a steel bar material is pressed into a die when the angle of the gradient portion is large and axially short. Was there.

As another method, it is also possible to use a mechanical device called a rotary wager to strike and form the small diameter portion and the sloped portion.

[Problems to be Solved by the Invention] In the former molding method of the related art, when the length of the gradient portion formed between the small diameter portion and the large diameter portion is short, the number of times of passing through the die is small, and the extrusion molding is required. However, in order to form a long gradient in the axial direction with a small gradient angle of around 2 degrees, the surface pressure becomes several times (4 times) as the taper angle becomes smaller in the die press molding. The material buckles as it grows,
It is crushed and cannot be manufactured by extrusion molding.

In addition, the latter method has the problems that not only the mechanical noise is high, but also the mechanical equipment is expensive, and it takes time to process each piece, and it is not possible to reduce the unit price due to high production efficiency. It was

The present invention was devised in view of these problems, and it is simple and easy to melt a steel bar that requires a small and long slope portion at a position defined from the rear end of the large diameter portion of the original size of the rear material. (EN) It is possible to provide a molding method and a device capable of high productivity that can be processed and formed in time.

[Means for Solving Problems] The method for forming a steel bar having a small slope portion according to the first invention is
A steel bar material (41) having a predetermined circular cross section and length is clamped by a pressing chuck (15) and its tip is pushed into a mouth die (5) to form a small diameter mouth portion (42) at the tip. After that, retract the push-in chuck (15) and pull it out once, then
At the position (5), a finishing die (6) having a taper hole (6b) that is long and small at the rear from the hole outlet (6a) of the predetermined drawing diameter is installed by switching means up and down, and the mouth of the material is attached. The part (42) again pushes the port part (42) forward from the finishing die (6), grasps the port part with the extraction chuck (14), and operates the extraction cylinder (20) and piston rod (21). While advancing and pulling out with, at the rear of the finishing die (6), the optical fiber sensor (31) detects the rear end of the material being drawn and moved,
The pulling operation is stopped, and the specified length (L) from the rear end of the material is detected. Next, after opening the drawing chuck (14), the rear part of the material is clamped by the pressing chuck (15), retracted and pulled out from the finishing die (6), and the small diameter part (44) of the predetermined length and the material diameter of the rear part are drawn. The axially long and small gradient part (4
5) is formed.

Another invention is an invention of an apparatus for performing the above method, in which a die stand (2) provided in the central portion of the frame (1) is provided with a die for mouthpiece (5) at the tip of a steel bar material, The upper and lower switching means (34) is used to switch between a finishing die (6) having a taper hole (6b) with a long specified length and a small gradient behind the hole outlet (6a) having a predetermined drawing diameter Freely installed, and in front of and behind the die stand (2), inside the parallel grooved guide shafts (3), (3), (4) and (4) installed on both ends of the frame (1), the inner dovetail groove inclined surface Extraction chuck (14) that engages (12a) and (13a) to open and close
(14), push-in chucks (15), (15) internal pull-out chuck holders (12) and push-in chuck holders (13) are slidably provided, respectively, and pull-out chucks (14) and (14) are both guide shafts ( 3) Connect with the pull-out slider (16) fitted over (3) (3) with links (17) (17),
Further, the pull-out chuck holder (12) is moved back and forth by the chuck cylinders (18) (18) attached to the slider to pull out the pull-out chucks (14) (1).
4) Open and close, and at the same time, pull out the pull-out slider (16) to the frame (1).
The piston rod (21) of the pull-out cylinder (20) fixed to the front part of the is installed so as to move back and forth.

Push-in chuck holder (13) has two guide shafts (4) (4) on the rear side.
Push chuck (15) (15) by moving it forward and backward with the chuck cylinder (23) (23) attached to the push slider (22)
The push rod (30) is fixed to the rear part of the frame (1) to open and close, and the piston rod (30) of the push cylinder (29) fixed to the rear of the frame (1) is installed to move forward and backward. An optical fiber sensor (31) that detects the length position and stops the pulling operation is arranged.Furthermore, between the push chucks (15) (15) and the push slider (22), the lower part of the push slider (22) is located. Positioning control means (28) that stops the back end position of the loaded material by pushing the backer (27) to the front by the tapered cotter (26) that is lifted by the working cylinder (28a) attached to And the material stand (39) to the material (41) on one side of the die stand (2) on the pushing side and above the center.
The transfer means (35), (36) by a handling robot for simultaneously picking up and picking up products from the dice position and picking up products from the dice position to the product table (40) on the other side at the same time are provided.

[Operation] When the material is loaded, the push-in chuck holder (13) and push-in slider (22) are on standby with retracted from the position shown in Fig. 1 by a predetermined distance, and the die stand (39) is moved from the material stand (39). 5) When the bar light material (41) is carried in on the center line, the cotter (26) of the positioning control means (28) is moved upward to push the bar steel material through the backer (27) to bring the material rear end to a fixed position. Stop and then press the chuck cylinder (23) (23) to push the chuck holder (13)
Is retracted and the material (41) is clamped by the pushing chuck (15), and the rear end of the material is stopped by the positioning control means (28).

Then, by pushing out the piston rod (30) of the pushing cylinder (29), the tip of the material (41) is pushed into the die with a mouth (5) provided at the center of the die stand (2) so as to be able to move up and down as shown in FIG. Rarely, a small diameter mouthpiece (42) is formed at the tip of the material. Then, the material (41) is once retracted by the backward movement of the piston rod (30) of the pushing cylinder (29) and pulled out from the mouth die (5), and at the same time, the mouth die (5) and the finishing die (6) are moved up and down. It is lowered by the operation of the switching means (34) and the finishing die (6) is installed by switching at the position of the mouth die (5), and the pushing cylinder
Finishing die of the material mouthpiece part (42) by extrusion operation by (29)
After extruding through the taper hole (6b) of (6), the drawing chucks (14) (14) on the front surface of the die will move to the chuck cylinder ((18) (1
8) The pull-out chuck holder (12) is retracted by the operation to close and pinch the mouth part (42).
The material (15) is opened by the forward movement of the push-in chuck holder (13) due to the operation of the chuck cylinders (23) (23), and the positioning control means (28) is lowered, so that the mouthpiece ( 42) is clamped, pulling cylinder (2
By the forward stroke of the piston rod (19) of (0), the material (41) is pulled out to a small diameter through the hole outlet (6a) of the finishing die (6) to form a small diameter portion (44) and finish. dice
By the hole fiber sensor (31) placed behind (6),
The rear end of the material is detected, the drawing operation is stopped at the same time, and the large diameter part of the specified length from the rear end of the material remains, so that the specified length can be detected, and the taper hole of the finishing die (6) (6b)
As a result, there is a long and small slope part (45) of the specified length between the large diameter part (43) of the specified length (L) from the rear end and the drawn small diameter part (44) as shown in FIG. Is formed.

At the same time, the pull-out chuck holder (12) is advanced by the operation of the chuck cylinder (18), the pull-out chuck (14) is opened through the dovetail groove engagement, and the pull-in chuck (15) grips the material (41).
Is pulled out to a predetermined position behind the finishing die (6), and a rope product (46) having a small slope portion (45) can be formed once every 15 or 6 seconds.

As shown in FIG. 3, the product transfer means (36) of the handling robot descends and grabs this product, then lifts it again and then moves laterally to the product stand (40), at the same time. The material transfer means (35) on one side (left side in the figure) also descends to grab the material, move up and move the next material laterally in conjunction with the product transfer means to transfer the next material to the die center position behind the die. During this time, the finishing die (6) and the mouth die (5) are raised and switched,
The transferred new material (41) is clamped by the pressing chuck (15) at the center of the mouth die (5), and the next pressing is repeated.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is an overall plan view showing an embodiment of the present apparatus and a schematic side view thereof, (1) is a frame, (2) is a die stand, (3) and (4) are frames. A guide shaft mounted parallel to the front and rear sides of (1) and the die stand (2), and (12) slidable over the guide shafts (3) and (3) on the front side of the die stand (2). The pull-out chuck holder (13) is a push-in chuck holder that is slidably provided on the rear side of the die stand (2) over the guide shafts (4) and (4). ), (13a) and pulling chuck (14) (14) that is opened / closed, push chuck
(15) (15) are respectively furnished.

(16) is the guide shaft on the front side of the extraction chuck holder (12).
(3) Use the extraction slider fitted over (3) to remove the extraction chuck (1
4) Connect the front ends of (14) with links (17) (17), and attach the piston rods (19) (19) of the chuck cylinders (18) (18) attached to the extraction slider (16) to the extraction chuck holder ( It is connected to 12).

(20) is the extraction cylinder attached to the front end of the frame (1).
Connect the piston rod (21) to the pull-out slider (16), and move the pull-out chuck holder (12) back and forth by the operation of the chuck cylinders (18) (18) and piston rods (19) (19) to move the pull-out chuck (1
4) Open and close (14), and by closing it, the steel bar material (41) described later
After pinching the mouth end portion (42) (see FIG. 13) of the piston as shown by the phantom line, the piston rod (21) is moved forward by the operation of the drawing cylinder (20) to move the finishing die (in the direction of the arrow shown in FIG. 13). It is designed to be pulled out through 6).

(22) is the guide shaft on the rear side of the push-in chuck holder (13).
(4) A push-in slider fitted over (4), with piston rods (2) of chuck cylinders (23) (23) mounted on both sides of the slider.
4) Move the push-in chuck holder (13) back and forth by (24) to open and close the push-in chucks (15), (15), and also push the material (41) loaded by the closing into the die with opening (5).
(22) The piston is pushed by the piston rod (30) of the pushing cylinder (see FIG. 12). The rear end of the push-in chuck (15) is laterally connected to the push-in slider (22) (25) and is slidably connected to the left and right.

(28) is a vertically movable positioning control means attached to the push-in slider (22) for positioning the rear end of the bar steel material when it is carried into the die center position.

(29) is a push-in cylinder attached to the rear of the frame (1).
The piston rod (30) is connected to the center of the push-in slider (22), and the push-in cylinder (29) is actuated to grip the material (41) with the push-in chucks (15) (15) as shown in FIG. It is possible to form a small diameter mouthpiece (42) at the tip of the material by pushing it into the die hole (5a) of the mouthpiece die (5).

FIG. 3 is a view on arrow AA of FIG. 1, (5) is a die with a mouth, (6)
Is a finishing die and is arranged below and above the inside of the support box (7) which is moved up and down in the die stand by the up / down switching means (34).

(35) and (36) have a space between one side of the pressing side behind the die stand (2) and the center part, and one is picking up the material (41) from the material stand (39) and attaching it to the mouth. Built-in cylinder that feeds materials to and removes products from the center line of the die (5) and the other one at the same time by picking up the product from the die center line position to the product cradle (40) on the other side. Material transfer means and product transfer means by a handling robot of the type.The material transfer means (35) and the product transfer means (36) are equipped with chucks (38) that are opened and closed by cylinders at their lower ends, respectively. The elevating mechanism (37) and the traverse mechanism (37a) perform a cycle movement of a constant orbit and a lateral lateral movement indicated by solid and tentative arrows in FIG.

FIG. 4 and FIG. 5 are explanatory views showing an upper and lower switching means of the mouth die (5) and the finishing die (6) provided at the central position of the die stand (2), and a partial vertical sectional view thereof, (5) is a die hole (5a) for forming a small diameter mouthpiece (42) at the tip of the material
It is a die with a mouth and is arranged at the center of pushing the material.

Since (6) forms a sloped portion (45) (see FIG. 14) having a small inclination angle of about 2 degrees and a long axial direction at a predetermined portion of the material, a hole outlet (with a predetermined drawing diameter of the material (41) ( A finishing die having a taper hole (6b) with a long long slope rearward from 6a),
The finishing die (6) and the mouth die (5) are mounted in the upper and lower two steps in a support box (7) that moves up and down in the central recess of the die stand (2).

The up / down switching means (34) includes an arm (1) of a pivot (9) in which a connecting rod (8) connected to a lower portion of the support box (7) is mounted on a frame (1).
0), and the other arm (10a) is connected to the piston rod (11a) of the working cylinder (11).
Thus, the mouth die (5) and the finishing die (6) are alternately switched up and down to the material extrusion center position.

6 and 7 are a partially enlarged plan view and a rear view of a part around the die stand in FIG. 1, where (12) is a pull-out chuck holder and (13) is a push-in chuck holder. Yes, the material transfer means (35) and the product transfer means (36) have exactly the same mechanism, and pick up the material (41) and the product at their lower ends,
Alternatively, a lifting mechanism (37) with a built-in cylinder type piston movement equipped with an openable / closable chuck (38) that is transferred to a predetermined position.
The vertical movement of the die stand by a constant stroke and the traverse mechanism (37a) that moves the elevating mechanism (37) horizontally in a constant stroke by the built-in cylinder piston movement installed above the die stand (2). ), The material transfer means (35) is from the material mounting table (39) to the die center, and the product transfer means (36) is from the die center position to the product table.
In (40), the materials and products are provided so as to be sequentially transferred in the same cycle.

(31) is an optical fiber sensor installed on the rear side of the die stand (2), which detects the rear end of the steel bar material (41) while pulling out the material (41) through the finishing die (6) and at the same time Stop the taper hole in the finishing die (6).
(6b) It has a detection function that allows the dimensional length from the rear end to the rear end of the material to accurately remain at the specified length (L) (see FIG. 14).

This optical fiber sensor (31) is provided with a detection unit (33) by an operating cylinder (32) for the optical fiber sensor as shown in FIG.
Is placed above the material center position of the temporary line, and when not needed,
It is provided so that it can move back and forth so as to move backward to the position indicated by the solid line in the figure. FIG. 8 is a right side view of FIG.

9 to 11 show the details of the positioning control means (28). This positioning control means has a square window (51) attached to the front surface of the pushing slider (22) at the center of the material. It has a U-shaped guide plate (50), a backer (27) fitted in its square window (51), and inside the guide plate (50), it is lifted and lowered by an operating cylinder (28a) attached to its lower part. Backer (27)
Tapered cotter that engages with tapered dovetail (53)
(26) and the backer (27) is pushed forward by the taper due to the rise of the cotter (26), so that the rear end of the steel bar material is stopped at a fixed position.

This is because when the material is gripped by the push-in chucks (15) (15), the rear end position of the loaded material is not constant, so that the rear end position of the steel bar material is accurately aligned to the fixed position and stopped. At the time of pushing chuck (15) (15) and slip prevention of the material,
This is because the rear end position of the material required for pushing can be finely adjusted to ± 0, and the accuracy is improved.

FIG. 14 shows that between the long small-diameter portion (44) in the first half and the large-diameter portion (43) slightly thicker than the small-diameter portion (44) provided at the rear of the specified length from the rear end (), FIG. 6 shows a specialty rod of the standard product which the present invention is intended to form, which requires a gentle small long slope portion (45) with a taper angle of 2-3 degrees.

According to the method and the device of the present invention, such a special rod is made of steel bar having the same diameter, for example, a diameter of about 16 mm in the first half.
A rod with a long and small sloped portion (45) in the dimension length () between the small diameter portion (44) and the large diameter portion (43) having a diameter of 19.5 mm can easily be integrated in a short time of a dozen seconds per unit. Can be molded.

15 and 16 are a plan view and a side view of a rod obtained by flattening the rear portion of the special steel bar formed as described above.

[Effects of the Invention] As described above, by using the method and apparatus of the present invention, it is possible to increase from the steel bar having the same diameter and the specified length to the small diameter portion having the specified length in the first half and the specified length from the rear end. The special steel bar that requires a long small gradient part with a taper angle of about 2 to 3 degrees between the large diameter part and the large diameter part and the small diameter part is very difficult to process and requires much labor. Can be automatically and easily molded by the drawing line process of
Since it can be processed in 15 to 6 seconds per unit, it is much easier than the conventional manufacturing method described above, and mass production is possible, which can contribute to cost reduction.

Further, in the conventional method of pushing into the die, a small and long slope portion is required locally, so that the tan for the die is increased.
Since the gent is large and the surface pressure is nearly four times as large, buckling and crushing occur during extrusion processing, and extrusion molding is impossible, but in the present invention, a die can be used for high-efficiency production of the same size. Since it is possible, there is an advantage that the yield can be improved.

[Brief description of drawings]

1 is an overall plan view showing an embodiment of the device of the present invention, a part of which is cut away, FIG. 2 is a schematic side view of the same, FIG. 3 is a view taken along the line AA of FIG. 1, and FIG. Fig. 5 is an explanatory view showing a die up / down switching means, Fig. 5 is a longitudinal sectional view of the same, Fig. 6 is a partially enlarged plan view before and after the die stand in Fig. 1, and Fig. 7 is a rear view of a part of Fig. 6. 8 and 9 are side views showing the material and product transfer means of FIG. 7, FIG. 9 is a front view showing the positioning control means of the rear end of the material attached to the front surface of the pushing chuck, and FIG. 10 is a vertical section of the same portion. A plan view, FIG. 11 is a plan view of the positioning control means, FIG. 12 is an explanatory view showing a mouthing state of the raw material, FIG. 13 is an explanatory view showing a pultrusion molding state of the raw material, and FIG. 14 is according to the present invention. Side view of standard products of special steel bar to be formed, No. 15-
FIG. 16 is a plan view and a side view showing the shape of a rod machined from this molded product. (1) is a frame, (2) is a die stand, (3) and (4) are guide shafts, (5) is a mouth die, (6) is a finishing die, (6a) is a hole outlet, (6b) is Tapered hole with small slope, (7) support box, (11)
Is an operating cylinder, (12) is a pulling plate chuck holder, (13) is a pushing chuck holder, (12a) and (13a) are inclined surfaces, (14) is a pulling chuck, (15) is a pushing chuck, and (16). Is a pull-out slider, (17) is a link, (18) is a chuck cylinder, (19) is a piston rod, (20) is a pull-out cylinder, (21) is a piston rod, (2
2) is a push slider, (23) is a chuck cylinder, (24) is a piston rod, (28) is a positioning control means for the rear end of the bar, (29) is a push cylinder, (30) is a piston rod, (31) Is an optical fiber sensor, (34) is a die up / down switching means, material stand, (40)
Is a product stand, (41) is a steel bar material, (42) is a mouth part, (43) is a large diameter part of a specified length, (44) is a small drawing part, and (45) is a long small sloped part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. 26-2459 (JP, B1)

Claims (2)

[Claims] 1. A steel bar material having a certain length is clamped by a pressing chuck, and the tip of the material is pressed into a mouth die to form a mouth portion having a reduced diameter, and then retracted and pulled out from the mouth die. At the die position with a mouth, a finishing die having a taper hole that is long and has a small slope is switched rearward from the hole outlet of a predetermined drawing diameter, the tip of the material is inserted into the finishing die again, the indenting chuck is opened, and then the mouth is opened. The attached part is held by a pulling chuck and is pulled out by a pulling means that moves, the material rear end is detected by an optical fiber sensor at the rear of the finishing die, the pulling is stopped, and after the pulling chuck is opened, the material rear part is pushed into the pushing chuck. By sandwiching it with and pulling it back from the finishing die, a small sloped part with a long length is formed between the small diameter part of the specified length and the diameter of the rod material at the rear part. Method of forming a steel bar having a small gradient portion, characterized in that occupied. 2. A die stand (2), a die with a mouth (5) for forming a gripping margin at the tip of a steel bar material, and a taper hole with a small slope long backward from a hole outlet (6a) of a predetermined drawing diameter of the material. A finishing die (6) having (6b) is provided so as to be vertically switchable around the center of material pushing, and guide shafts (3), (4) are installed on both sides of the frame (1) before and after the die stand (2). And a pull-out chuck (14) equipped with a push-in chuck (15), a pull-out chuck holder (12) having a push-in chuck (15), and a push-in chuck holder (13). Piston rods (21) of the drawing cylinder (20) mounted on the frame (1) before and after them respectively.
And a pull-out slider (16) that can slide forward and backward with the piston rod (30) of the push-in cylinder (29), and a push-in slider (22) to connect the pull-out slider (16) and the pull-out chuck (14). The pull-out chuck holder (12) is moved forward and backward by the chuck cylinder (18) connected to the link and attached to the pull-out slider (16) to pull the pull-out chuck (14) and push-in chuck (1) to the push-in slider (22).
5) The rear end is linked so that it can slide laterally, and the push cylinder (23) attached to the push slider (22) can move the push chuck holder (13) forward and backward to open and close the push chuck (15). The optical fiber sensor (31) which is installed on the press side and detects the rear end of the material on the pushing side and stops the pulling operation to detect the specified length from the rear end of the material, and the rear end of the material is pushed when the work material is loaded. Positioning control means that can be moved up and down
(28) A steel bar forming device having a small slope portion provided with.