JPH0222161Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The invention is mainly used to chamfer or deburr both ends of a workpiece such as a metal bar that has been cut to a predetermined length. This relates to a double-end processing device.

In particular, the present invention includes a clamp mechanism that can clamp a workpiece such as a bar horizontally and at a constant height in a loosely tightened manner using a pair of clamp heads, and a clamp mechanism that is arranged opposite to each other on both sides of the clamp mechanism. , a pair of machining units, each of which has a machining head at the tip of the unit main body that can reciprocate on a fixed base and can freely move forward and backward with respect to the end machining position of the workpiece clamped by the clamp mechanism; This invention relates to an improvement of a reference position setting mechanism in a double-end processing device, which includes a reference position setting mechanism for setting a reference position of a workpiece prior to the processing of both ends of the workpiece by a pair of processing units.

(Prior technology) Conventionally, this type of double-end machining device was developed in 1977.
There is a device disclosed in Japanese Patent No. 98876, in which the positioning mechanism (reference position setting mechanism) for a workpiece such as a bar material is a pair of machining units arranged on a fixed base between a pair of machining units on both sides. A positioning device main body is provided on each object receiving member, one positioning device main body is fixed to the workpiece receiving member, and the other positioning device main body is slidable in the axial direction of the workpiece relative to the workpiece receiving member. The main body of the positioning device on the fixed side has a rotatable reference member (stopper piece) that is rotated by a rotary motor to approach or retreat from one end surface of the workpiece. The main body of the positioning device on the movable side has a rotatable abutting member (pusher) which is rotated by another rotary motor and moves toward and away from a position facing the other end surface of the workpiece. In order to position the workpiece, the workpiece, such as a bar, is fed onto the pair of workpiece receiving members and first clamped, and then the reference member is moved by the rotation of the motor. The workpiece is rotated to a position close to one end surface of the workpiece, and the contact member is rotated by the motor to a position facing the other end surface of the workpiece, and then the side on which this contact member is provided (movable side) By moving the positioning device main body forward in the direction of the reference member by the drive cylinder, the front end surface of the workpiece is brought into contact with the reference member while the contact member is in contact with the other end surface of the workpiece. , thereby positioning the workpiece.

(Problem to be solved by the invention) In the positioning mechanism, that is, the reference position setting mechanism, in the conventional double-end processing device as described above, the reference member (stopper piece) and the abutment member (pusher)
In addition to requiring separate motors to move the abutting member toward and away from the position facing the end surface of the workpiece, a drive cylinder is also required to move the abutment member in the axial direction of the workpiece. As the number of points increases, the overall size of the reference position setting mechanism increases, resulting in higher costs.In addition, the number of steps for positioning operations increases, resulting in a considerable amount of time required for positioning.

The problem to be solved by the present invention is to provide a reference position setting mechanism with a small number of parts, a simple structure, low cost, easy operation, and quick positioning.

(Means for Solving the Problem) The reference position setting mechanism in the device for processing both ends of a workpiece such as a bar according to the present invention is such that a stopper piece provided at the tip approaches or retreats from one end surface of the workpiece. a spring for holding the operating shaft such that a stopper piece at the tip thereof is always positioned close to one end surface of the workpiece; , a bell crank pivotally attached to the support frame and having one crank arm interlockingly connected to the operating shaft, and a unit body of one of the processing units,
When the machining head at the tip of the unit main body moves forward to a position for machining one end of the workpiece, it collides with the other crank arm of the bell crank and rotates it, thereby moving the operating shaft to the stopper at the tip. An operation piece is provided on the machining head of the other machining unit, and an operation piece is provided to move the piece in a direction in which the piece is retracted from a position close to one end surface of the workpiece. It is characterized by comprising a pusher that presses the opposite end surface of the workpiece, which has been clamped in a relaxed state beforehand, when advancing to the processing position, and brings the opposite end surface into contact with the stopper piece.

(Function) When setting the reference position of the workpiece on the clamp mechanism, the workpiece is temporarily clamped in a relaxed state by this clamp mechanism, and the stopper piece of the reference position setting mechanism is interposed on the operating shaft. It is held in a position close to one end surface of the workpiece by the biasing force of a spring. In such a state, when the main body of the processing unit on the side where the pusher is installed is moved forward, the pusher will move the end of the workpiece until the processing head reaches the opposite end processing position of the workpiece. The workpiece slides between the pair of temporarily clamped clamp heads, and the opposite end surface contacts the stopper piece, thereby causing the workpiece to slide between the pair of clamp heads that are temporarily clamped. The reference position of the material is set. When this reference position is set, the main body of the processing unit on the side where the pusher is provided has reached the end processing position of the workpiece. Also, at this point, the clamping state of the workpiece by the clamping mechanism is set to the main clamping state. Then, when the unit body of the opposite machining unit is advanced toward the workpiece, the operation piece on the unit body moves forward until the machining head reaches the opposite end machining position of the workpiece. The bell crank collides with the crank arm of the opposing bell crank, causing the bell crank to rotate, and the rotation of the bell crank causes the operating shaft to slide in the retracting direction, and the stopper piece at its tip abuts against the end surface of the workpiece. Evacuate from position. After the stopper piece is retracted, the tip of the processing head reaches the end processing position of the workpiece. This immediately makes it possible for both machining heads to process both ends of the workpiece.

(Example) Next, an example of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 indicates a clamping mechanism, reference numerals 2 and 3 indicate a pair of processing units disposed opposite to each other on both sides of the clamping mechanism 1, and reference numeral 4 indicates a workpiece reference position setting mechanism.

The clamp mechanism 1 includes a fixed clamp head 5 having V-shaped grooves 5a and 6a formed on mutually opposing surfaces.
and a movable clamp head 6, the fixed clamp head 5 being fixed to the lower end of the mounting bracket 7.
This attachment 7 is a support frame 8 installed at an appropriate height.
The movable clamp head 6 is disposed directly below and opposite the fixed clamp head 5, and is attached to the tip of the piston rod 9a of the hydraulic cylinder 9. The clamp head 5 approaches and retreats from the fixed clamp head 5 according to the vertical expansion and contraction movements of the clamp head 5. However, when operating the clamp,
With the round bar M as the workpiece placed on the V-shaped groove 6a of the movable clamp head 6, the hydraulic cylinder 9 is operated to raise the clamp head 6 via the piston rod 9a.
As shown in the figure, the round bar M is held between both clamp heads 5,
The clamping action of 6 allows it to be clamped horizontally and at a constant height. In addition, this clamp mechanism 1
is a relaxed state in which when a certain axial load is applied to the workpiece M held between the clamp heads 5 and 6, the workpiece M may slide against the clamp heads 5 and 6 in the axial direction. clamping (temporary clamping or temporary tightening) function, and clamping in a tightened state where the workpiece M is firmly held between the clamp heads 5 and 6 and no rubbing occurs even when a load is applied in the axial direction. (main clamp or final tightening) function, and the two-stage clamp function is set by appropriately changing the pressure of the oil supplied to the hydraulic cylinder 9. Ru.

The pair of processing units 2 and 3 have fixed bases 2a and 3a, respectively, and a unit body 2b, which can reciprocate on the fixed bases in parallel to the axial direction of the workpiece M clamped by the clamp mechanism 1. 3b
and machining heads 2c and 3c, which are provided at the tip of the unit body and move together with the unit bodies 2b and 3b on the same axis as the workpiece M clamped by the clamp mechanism 1. 2c and 3c are rotatable integrally with the rotating main shafts 10 and 11 mounted in the unit bodies 2b and 3b, and have chamfering cutters 15 and 16 on the periphery of their respective tip surfaces. ,11
are the motors installed on the unit bodies 2b and 3b (only the motor on the processing unit 3 side is shown as 12)
Belt transmission means (13 only on the processing unit 3 side)
A pusher 14 is provided on the central axis of the machining head 3c of the machining unit 3 via a coil spring 40.

Unit main body 2b of one of the above processing units 2
(not shown) is driven by a hydraulic cylinder provided on the fixed base 2a side, and the tip of the machining head 2c of the unit main body 2b moves from the most retracted position shown in the figure to the most advanced position on the clamp mechanism side _. It is designed to move forward and backward in between. The unit main body 3b of the other processing unit 3 is attached to the tip of a piston rod 17a of a hydraulic cylinder 17 installed on the fixed base 3a side, as shown schematically.
They are connected via a connecting member 18, so that the tip of the processing unit 3c of the unit body 3b advances and retreats during a stroke _S3 ranging from the most retracted position shown in the figure to the most advanced position (processing position) on the clamp mechanism side. It's summery. Further, in this processing unit 3, a guide bar 19 is integrally provided on the longitudinal side of the unit main body 3b, and this guide bar 19 has a plurality of workpieces M having a certain length. In the case of repeated machining, the machining head 3c is temporarily retracted by the minimum distance _S0 necessary for exchanging the workpiece M without retracting it to the most retracted position of the stroke _S3 each time one machining is completed. A temporary retraction operation dog 20 is provided for this purpose. This dog 20 is friction-fitted to the guide bar 19 so that it can slide and move relative to the guide bar 19 when a load exceeding a certain level is applied, and it has a fixed base. A pair of front and rear stoppers 21 installed on the 3a side,
22 and limit switch 2 for regulating the temporary retreat position
It is designed to abut against the operation piece 23a of No. 3.
Further, the most advanced position of the unit main body 3b is regulated by a most advanced position regulating stopper 24 that can be changed in multiple stages, for example, 3 stages, depending on the length of the workpiece, and the most retracted position is regulated (not shown). Although not shown here, each operation is performed by a stopper provided at a required portion of the rear end of the fixed base 3a. Now, when the unit main body 3b is advanced from the most retracted position shown in FIG. 1 by the hydraulic cylinder 17,
Initially, the dog 2 was in contact with the rear stopper 21.
As the unit body 3b moves forward, the contact piece 20a of the unit body 3b collides with the opposing front stopper 22. From then on, this dog 20 slides on the guide bar 19, and the front end side impact on the unit body 3b occurs. When this part 25 hits the most forward position regulating stopper 24 and the tip of the machining head 3c reaches the most forward position (machining position) _P1 , the hydraulic cylinder 17 is activated.
drive is stopped. Next, when the unit main body 3b is retreated from this most advanced position by the retracting action of the piston rod 17a, the abutment piece 20a of the dog 20, which was in contact with the front stopper 22 at the most advanced position of the unit body, temporarily moves back.
S ₀ When moving backward, it hits the rear stopper 21 and the limit switch 23 for temporarily regulating the backward position.
23a, the drive by the hydraulic cylinder 17 is thereby stopped, and the tip of the machining head 3c is stopped at the temporarily retracted position _P2 . Thereafter, the unit main body 3b moves forward and backward so that the machining head 3c reciprocates between strokes _S0 ranging from _P2 to _P1 . still,
Confirmation that the unit main body 3b has reached the most forward position is made by kicking the operating piece 27a of the limit switch 27 with the dog 26 provided on the guide bar 19. In addition, the stopper 24 for regulating the most advanced position
is a three-stage stopper part 2 according to the dimensions of the workpiece.
4a, 24b, and 24c, and is driven forward and backward in a direction orthogonal to the moving direction of the unit main body 3b by a fluid pressure cylinder 28 installed on the fixed base 3a side. The stopper part 24a of the eye is set at a position where the front end side abutting part 25 of the unit main body 3b can abut, and the abutting part 25 abuts against this stopper part 24a, so that the machining head 3c moves as shown in the figure. It will be locked at position _P1 . In the case of a workpiece M' that is longer than the workpiece M, for example, the second stage stopper part 24b corresponding to this workpiece M' can be pushed out to a position where the abutting part 25 can hit. good.

The reference position setting mechanism 4 is for setting the reference position of the workpiece M as a lever prior to machining both ends of the workpiece M by the pair of machining units 2 and 3 described above. A stopper piece 29 that abuts and supports one end surface of the workpiece M
The stopper piece 29 supports the operating shaft 3 which is vertically slidably supported on the support frame 8 via a bearing 30.
It is integrally connected to the lower end of 1. This operating shaft 31
A lateral hole 32 is provided through the lateral hole 32, and the tip of one crank arm 33a of a bell crank 33 is inserted into the lateral hole 32. A supporting frame 8 is pivotally attached to the upper end of the operating shaft 31.
A coil spring 37 is inserted into a through hole 36a of another bracket 36 pivotally connected to the actuating shaft, and a coil spring 37 is interposed between this bracket 36 and the flange 31a of the operating shaft. Therefore, this operating shaft 31 is restricted to a predetermined lowered position (at this position, the stopper piece 29 can come into contact with one end surface of the workpiece M) by one crank arm 33a of the bell crank 33. However, as the unit main body 2b of the processing unit 2 moves forward, the operating piece 38 provided on the unit main body 2b engages the bell crank 33.
When the bell crank 33 is rotated by kicking the tip of the other crank arm 33b, the operating shaft 31
is pushed up against the biasing force of the spring 37, whereby the stopper piece 29 is retracted upward from its home position. Confirmation that the stopper piece 29 has been retracted is made by the limit switch 39.

Next, to explain the overall operation of the double-end machining device having the above-mentioned configuration, first, the workpiece M is placed on the lower movable clamp head 6 which is lowered and opened relative to the upper fixed clamp head 5. After this, the movable clamp head 6 is raised by the hydraulic cylinder 9 and the workpiece M is clamped in a relaxed state between it and the fixed clamp head 5 (temporary clamp).
I'll keep it. At this time, the stopper piece 29 of the reference position setting mechanism 4 faces a position close to one end surface of the temporarily clamped workpiece M. Next, when the unit body 3b of the processing unit 3 is advanced, the tip of the processing head 3c is at the most advanced position (processing position) P ₁
The pusher 14 comes into contact with the other end surface of the workpiece M and presses it a little before reaching the workpiece M. As a result, the workpiece M slides between the temporarily clamped clamp heads 5 and 6 and vice versa. The side end surface abuts against the stopper piece 29 of the reference position setting mechanism 14,
The reference position is thereby set.
The pusher 14 is provided so as to be extendable and retractable in the axial direction at the tip of the processing head 3c via a coil spring 40 installed in the processing head 3c, so that the tip of the processing head 3c is at the most forward position _P1. At the time when the pusher 14 reaches this point, the pusher 14 is in a state of being contracted inward of the processing head 3c. After setting the reference position of the workpiece M in this way, the pressure of the hydraulic oil supplied to the hydraulic cylinder 9 in the clamping mechanism 1 is increased to tighten the workpiece M, which had been temporarily clamped. Clamp the book. Then, the unit body 2b of the machining head 2 is advanced by a stroke _S2 to bring the tip of the machining head 2c to the most advanced position (machining position).
Before the tip of the machining head 2c reaches its machining position, the operating piece 38 on the unit main body 2b kicks the tip of the crank arm 33b of the bell crank 33, causing the stopper piece 29 to retract upward. After the stopper piece 29 is retracted, the tip of the machining head 2c reaches the machining position. After the unit bodies 2b and 3b of both machining units 2 and 3 are set at the machining positions at both ends of the workpiece M which is actually clamped, both machining heads 2c and 3c are rotated as appropriate to perform chamfering or chamfering. The deburring process is performed. After finishing machining one workpiece M, machining unit 2
The unit main body 2b of the machining unit 3 is retracted to its original position, and the unit main body 3b of the machining unit 3 is retracted to the temporary retraction position _P2 , and the clamping by the clamp heads 5 and 6 of the clamp mechanism 1 is released, and the next workpiece is The material M will be fed onto the movable clamp head 6. The stopper piece 29 of the reference position setting mechanism 4 is held at the retracted position during machining, but after the machining is completed, the tip of the arm 33b of the bell crank 33 moves back onto the unit body 2b as the unit body 2b moves backward. It is detached from the operation piece 38 and returns to the home position.

(Effect of the invention) According to the invention, the reference position setting device of the double-end processing device is capable of reciprocating sliding on the support frame so that the stopper piece provided at the tip can approach or retreat from one end surface of the workpiece. an operating shaft supported by the operating shaft; a spring for holding the operating shaft such that a stopper piece at the tip thereof is always positioned close to one end surface of the workpiece; and a spring pivotally connected to the support frame. , one crank arm is provided in the unit body of one machining unit, and a bell crank is interlocked with the operating shaft, and the machining head at the tip of the unit body moves forward to a position for machining one end of the workpiece. When the bell crank hits the other crank arm of the bell crank and rotates it, the actuating shaft is moved in a direction in which the stopper piece at the tip of the actuating shaft is retracted from a position close to one end surface of the workpiece. and an operating piece provided on the machining head of the other machining unit, the workpiece being clamped in a relaxed state in advance when the machining head advances to the other end machining position of the workpiece. and a pusher for pressing the opposing end surface of the stopper piece so that the opposite end surface comes into contact with the stopper piece, and unlike conventional devices, separate motors are used to drive the stopper piece and the pusher. Since no cylinder or cylinder is required, the number of parts is small and the structure is simple, making it possible to significantly reduce costs. In addition, since the stopper piece that comes into contact with one end surface of the workpiece is always held in a position close to that one end surface via the operating shaft and spring, when setting the reference position, it is necessary to set the stopper piece on the side where the pusher is installed. The reference position of the workpiece can be quickly set by an extremely simple operation of moving the main body of the processing unit forward and pressing the opposing end surface of the workpiece with a pusher provided on the processing head. Furthermore, by the time this reference position has been set, the machining head of the pusher side machining unit has reached the end machining position of the workpiece, so when machining both ends with both machining units, it is necessary to All that is required is to move the unit body of the processing unit on the side opposite to the pusher side forward to position its processing head at the opposite end processing position, thus completing the setting of the reference position of the workpiece. After that, you can start machining both ends immediately.
Work efficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the - line in FIG. 1... Clamp mechanism, 2, 3... Processing unit, 2a, 3a... Fixed base, 2b, 3b...
Unit body, 2c, 3c... Processing head, 4...
... Reference position setting mechanism, 5 ... Fixed clamp head, 6 ... Movable clamp head, 8 ... Support frame, 14 ... Pusher, 29 ... Stopper piece,
M... Work material, 30... Bearing, 31... Operating shaft, 32... Horizontal hole, 33... Bell crank, 33
a, 33b...crank arm, 35...pin,
37...Coil spring, 38...Operation piece.

Claims (1)

[Scope of utility model registration request] A clamp mechanism that can clamp a workpiece such as a bar horizontally and at a constant height in a loosely tightened manner using a pair of clamp heads, and a clamp mechanism that is disposed opposite to each other on both sides of the clamp mechanism, each mounted on a fixed base. a pair of machining units, each of which has a machining head at the tip of a unit main body that can reciprocate and move back and forth with respect to the end machining position of the workpiece clamped by the clamp mechanism; and the pair of machining units. A device for processing both ends of a workpiece such as a bar, comprising: a reference position setting mechanism for setting a reference position of a workpiece prior to processing both ends of the workpiece;
The reference position setting mechanism includes an operating shaft that is slidably supported in a reciprocating manner on a support frame so that a stopper piece provided at the tip can approach or retreat from one end surface of the workpiece; A stopper piece at the tip is pivotally connected to the support frame and a spring for holding the stopper piece always in a position close to one end surface of the workpiece, and one crank arm is interlocked and connected to the operating shaft. A bell crank is provided on the unit main body of one of the processing units, and when the processing head at the tip of the unit main body moves forward to the processing position for one end of the workpiece, it collides with the other crank arm of the bell crank. an operating piece for moving the operating shaft in a direction in which the stopper piece at the tip thereof retreats from a position close to one end surface of the workpiece by rotating the operating shaft; It is provided in the processing head, and when the processing head moves forward to the other end processing position of the workpiece, it presses the opposite end surface of the workpiece, which has been clamped in a relaxed state in advance, so that the opposite end surface is A device for processing both ends of a workpiece such as a bar, characterized in that it is comprised of a pusher that abuts a stopper piece.