JP2014014852A - Press molding device and press molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press molding device 1 and a press molding method which are safe and can efficiently press-mold a primary molding 110.SOLUTION: A press molding device 1 and a press molding method include a stationary mold 80 which fixes a primary molding 110, and a plurality of drawing molds 81 which stepwisely molds the primary molding 110, and further include a disc part 31 which is mounted with the drawing molds 81, rotary shaft parts 35 which have wire parts 37a, 37b, 37c and are arranged at intervals approximately same as those between adjacent drawing molds 81, a rotational drive part 40 which rotates the disc part 31, a non-contact displacement sensor 5 which detects the wire parts 37a, 37b, 37c, a control device 70 which stops the rotation of the disc part 31 when the wire part 37a is detected, a first actuator 4 which moves the disc part 31 downward, an inner periphery processing tool 55 which has a processing blade 56 forming a female spline 115, and a second actuator 51 which moves the inner periphery processing tool 55 downward.

Description

  The present invention relates to a press molding apparatus and a press molding method for press-molding a plastic metal pipe stepwise in a manufacturing process of an upper shaft constituting a steering shaft of an automobile, for example.

  2. Description of the Related Art Conventionally, in a steering apparatus for an automobile, a steering shaft with a steering wheel attached to the upper end has a structure that absorbs collision energy in order to prevent the steering wheel from hitting a driver in the event of a collision.

  Specifically, the steering shaft includes an upper shaft to which a steering wheel is attached and a lower shaft that is connected to the lower side of the upper shaft so as not to be relatively rotatable.

  And the connection part of the upper end side of a lower shaft and the lower end side of an upper shaft is comprised so that relative rotation is impossible by spline fitting, and it can slide to a longitudinal direction. For this reason, at the time of a collision, the lower shaft slides and absorbs collision energy, thereby suppressing the upper shaft from moving toward the driver and preventing the steering wheel from hitting the driver.

  By the way, this upper shaft is formed by press-molding stepwise using a plurality of drawing dies having different shapes on the inner peripheral surface of a cylindrical plastic metal pipe that is uniform in the longitudinal direction. Therefore, a technique has been proposed in which a plurality of drawing dies are automatically switched to efficiently perform a series of press forming.

  For example, in the press forming apparatus for a metal pipe described in Patent Document 1 by the applicant, one end side of the metal pipe is held by a holding metal fitting, and a slide plate mounted with a plurality of molding dies is moved in the horizontal direction. It has proposed that the other end side of the metal pipe is press-molded step by step by switching the molding die.

  However, the metal pipe press forming apparatus described in Patent Document 1 has a larger space required for installing the press forming apparatus because the slide plate protrudes outward from the lifting plate every time the forming mold is switched. There has been a problem that safety to the surroundings during press molding is lowered.

  Furthermore, when one metal pipe is press-molded, it is necessary to return the slide plate to the initial position. Therefore, it takes time to start press molding of the next metal pipe, and the press molding cannot be performed efficiently. was there.

JP 2012-66271 A

  In view of the above-described problems, an object of the present invention is to provide a press molding apparatus and a press molding method that are capable of press molding a cylindrical body with high safety and efficiency.

  The present invention has one fixed die for fixing one end side in the longitudinal direction of the cylindrical body, and an inner peripheral shape for moving in the longitudinal direction and press-molding the other end side of the cylindrical body stepwise. And a press forming method comprising a plurality of substantially cylindrical drawing dies different from each other in a substantially disc shape having a thickness in the longitudinal direction and in a circumferential direction of a plane facing the fixed die. The plurality of aperture dies are mounted along the rotation plate, and the rotation plate having a through hole communicating with the plurality of aperture dies, and the central angle between the aperture die adjacent in the circumferential direction and the center of the rotation plate are substantially the same interval. A rotating shaft portion that is arranged in a circumferential direction and extends in the longitudinal direction and connected to the center of the rotating plate so as not to be relatively rotatable, and at least one of the rotating plate in the circumferential direction. Rotational drive means for rotationally driving, and the line Detecting means for detecting the part in a non-contact manner, switching means for stopping the rotation of the rotating plate by the rotation driving means and switching the aperture type when the detecting means detects the linear portion, and the rotation stopped A moving means for moving the rotary plate in the longitudinal direction and press-molding the other end of the cylindrical body; an inner peripheral processing section having a processing blade for forming a spline on the inner peripheral surface of the cylindrical body at the tip; For the cylindrical body constrained by the fixed mold and the drawing mold, the inner peripheral working portion is inserted from the through hole into the inner peripheral surface of the cylindrical body along the longitudinal direction. And spline forming means for forming the material.

According to the present invention, the press molding apparatus and the press molding method are highly safe and can press the cylindrical body efficiently.
Specifically, by attaching a plurality of drawing dies to the rotating plate against the slide plate protruding from the press forming device each time the drawing die is switched, the drawing is performed with a part of the rotating plate protruding from the device. Even when the mold is switched, the protruding amount of the rotating plate protruding from the press molding apparatus can be made constant. For this reason, the press molding apparatus can reduce the space required for installation, can ensure safety with respect to the surroundings, and can safely switch between a plurality of drawing dies.

  Furthermore, in order to switch a plurality of drawing dies for one fixed die, the press molding device is fixed in the longitudinal range on the opposite side of the rotary shaft with respect to the drawing die facing the fixed die. The mold is not placed. That is, a space of a certain size can be secured in the longitudinal direction of the rotary plate on the diaphragm die side. Thereby, the press molding apparatus can secure a space for attaching and detaching the drawing die, which is a heavy object, and can improve safety in exchanging the drawing die.

In addition, the press forming apparatus can efficiently switch the drawing die by detecting the linear portion with the detecting means.
More specifically, when the diaphragm plate is switched by rotating the rotating plate using a servo motor, a loss occurs in the time until the rotating plate stops rotating due to feedback control of the servo motor.

  On the other hand, when the aperture type is switched using the detection means, feedback control can be made unnecessary, so that the time until the rotation of the rotating plate is stopped can be shortened. Thereby, the press molding apparatus can efficiently and surely switch the drawing die. For this reason, the press molding apparatus can press-mold a cylindrical body efficiently.

  Then, by the spline forming means, the press forming apparatus can perform the outer peripheral shape forming and the inner peripheral surface processing by a series of operations without taking out the cylindrical body once inserted into the fixed mold.

  In addition, the rotary plate is equipped with the drawing die used in the final stage of press molding and the drawing die used for the first time adjacent to each other in the circumferential direction, so that compared to the slide plate moving in the horizontal direction, The molding apparatus can return the rotating plate to the initial position in the rotation direction in a short time.

Thereby, even if there is only one fixed mold, the time required to start press molding of the next cylindrical body can be shortened. For this reason, it is possible to perform press molding more efficiently and continuously with a lower mold cost than in the case of using a plurality of fixed molds.
Therefore, the press molding apparatus and the press molding method have high safety with respect to the surroundings and can perform press molding efficiently.

  As an aspect of the present invention, the spline forming means can be inserted into the inner peripheral surface of the cylindrical body at the final stage of press forming the cylindrical body fixed by the fixed mold.

According to the present invention, it is possible to notify the surroundings by the operation that the stepwise press molding for one cylindrical body is the final stage.
Specifically, in a step-by-step press molding using a drawing die having the same outer peripheral shape and a rotating plate, there is a possibility that it is difficult to understand which stage the pressing process is.

Therefore, by performing spline molding on the inner peripheral surface in the final stage, the worker can easily grasp that the press molding is in the final stage. Thereby, the press molding apparatus can aim at the improvement of the safety | security with respect to the circumference | surroundings.
Therefore, the press molding apparatus can easily make it known by the operation that it is the final stage of press molding, and can improve safety.

  Further, as an aspect of the present invention, a spur gear that meshes with the rotation driving means is formed on a peripheral side surface of the rotating plate, and the rotation driving means meshes with the spur gear of the rotating plate to rotate the rotating plate. It can be set as the structure which rotates a board.

According to the present invention, the rotating plate can be rotated with a small driving force, and the load on the rotation driving means can be reduced.
Specifically, the weight of the rotating plate equipped with a plurality of aperture dies is greatly increased. For this reason, for example, when a driving force is directly transmitted to the rotating shaft portion to rotate the rotating plate, a large driving force is required. Therefore, by forming a spur gear on the peripheral side surface of the rotating plate, the driving force required for rotating the rotating plate can be reduced as compared with the case where the driving force is directly transmitted to the rotating shaft portion.

  Further, when the driving force is directly transmitted to the rotating shaft portion, if the rotating plate is stopped from rotating, a large twist is applied to the rotating shaft portion due to the rotational inertia of the rotating plate, which may cause a problem. On the other hand, since spur gears are formed on the peripheral side surface of the rotating plate, there is little possibility that a large twist will occur in the rotating shaft portion even if the rotating plate is stopped.

In addition, when the rotation driving unit is provided so as to transmit the driving force directly to the rotation shaft unit, a reaction force against pressing during press molding may be transmitted to the rotation driving unit, causing a problem. On the other hand, the reaction force at the time of press molding can be made difficult to be applied to the rotation drive unit by engaging the rotation drive unit with the spur gear of the rotating plate. For this reason, the press molding apparatus can reduce a possibility that a malfunction occurs in the rotation drive unit due to a reaction force during press molding.
Therefore, the press molding apparatus can improve not only safety but also reliability.

  According to the present invention, it is possible to provide a press molding apparatus and a press molding method that are highly safe and capable of efficiently press-molding a cylindrical body.

Explanatory drawing explaining the process from shaping | molding of an upper shaft to a process. Explanatory drawing explaining the process of press molding in a secondary process. The external appearance perspective view which shows the external appearance from the upper direction in a press molding apparatus. The front view which shows the external appearance from the front in a press molding apparatus. The AA arrow expanded sectional view in FIG. Explanatory drawing explaining a rotating plate. The front view which shows the external appearance from the front in an inner peripheral working tool. Sectional drawing which shows the state which set the primary molded product to the fixed mold. Sectional drawing which shows the press molding state in a 1st press process. Sectional drawing which shows the state of the press molding apparatus switched to the 2nd draw die. Sectional drawing which shows the press molding state in a 2nd press process. Sectional drawing which shows the state of the press molding apparatus switched to the 3rd aperture die. Sectional drawing which shows the press molding state in a 3rd press process. Sectional drawing which shows the press molding state in a 4th press process. Sectional drawing which shows the state after the 4th press process completion.

An embodiment of the present invention will be described below with reference to the drawings.
First, the upper shaft 130 constituting the steering shaft used in this embodiment will be described with reference to FIG.
FIG. 1 is an explanatory diagram for explaining the process from molding to processing of the upper shaft 130.

  As shown in FIG. 1, the upper shaft 130 has a steering attachment portion 131 for attaching a steering wheel (not shown) in order from one end in the longitudinal direction (lower side in FIG. 1), and a tapered portion 132 whose diameter is increased from the steering attachment portion 131. Two substantially concave annular grooves 133, a large diameter portion 112 having a diameter larger than that of the steering mounting portion 131, a reverse tapered portion 113 having a diameter reduced from the large diameter portion 112, and a connection portion 114 connected to the lower shaft 200 are integrated. Is configured.

  The steering attachment portion 131 includes a serration portion 131a for mounting the steering wheel in a relatively non-rotatable manner, and a screw portion 131b for preventing the steering wheel from moving in the longitudinal direction and fixing the steering wheel to the upper shaft 130.

A female spline 115 extending in the longitudinal direction is formed on the inner peripheral surface of the connecting portion 114. The female spline 115 is formed so as to be slidable and fitted in the longitudinal direction with a male spline 201 provided at the tip of the lower shaft 200.
As shown in FIG. 1, such an upper shaft 130 is manufactured through a stepped process with respect to the substantially cylindrical plastic metal pipe 100.

  Specifically, the upper shaft 130 is formed by press-molding one end (the lower side in FIG. 1) of the substantially cylindrical plastic metal pipe 100, and the steering attachment portion 131, the taper portion 132, and the pre-processing portion before processing. A primary process of forming the front shape portion 111 formed of the annular groove portion 133 and the other end side (upper side in FIG. 1) of the plastic metal pipe 100 are press-molded stepwise to form the reverse taper portion 113 and the connection portion. 114 and the secondary process of forming the female spline 115, and the tertiary process of processing the annular groove 133 and the steering attachment part 131.

Here, in this embodiment, a secondary process using the press molding apparatus 1 described later will be described in detail.
First, stepwise press forming in the secondary process will be described in detail with reference to FIG.
FIG. 2 is an explanatory diagram for explaining the press molding process in the secondary process.

As shown in FIG. 2, in the secondary process, four stages of a first press process, a second press process, a third press process, and a fourth press process are performed in this order.
In the first pressing step, the diameter of the end portion different from the front shape portion 111 of the primary molded product 110 is reduced, and the first diameter diameter is gradually reduced from the large diameter portion 112 of the upper shaft 130 and the large diameter portion 112. A first press-formed product 110a having a reverse tapered portion 113a and a first reduced diameter portion 114a having the same diameter as the small diameter side of the first reverse tapered portion 113a is obtained.

  In the second press step, the first reduced diameter portion 114a of the first press molded product 110a is further reduced in diameter to obtain the second press molded product 110b having the second reverse tapered portion 113b and the second reduced diameter portion 114b. To do.

In the third pressing step, the second reduced diameter portion 114b of the second press-formed product 110b is reduced to the same outer diameter as the outer diameter of the connection portion 114 in the upper shaft 130, and the connection portion 114 and the reverse taper portion 113 are reduced. The third press-formed product 110c having the above is acquired.
In the fourth press step, the secondary molded product 120 is obtained by performing spline processing on the inner peripheral surface of the connection portion 114 in the third press-formed product 110c.

Next, the press molding apparatus 1 used for such a secondary process will be described in detail with reference to FIGS.
3 shows an external perspective view of the appearance from above in the press molding apparatus 1, FIG. 4 shows a front view from the front in the press molding apparatus 1, and FIG. 5 is an enlarged view along arrow AA in FIG. FIG. 6 is an explanatory view for explaining the rotary plate 30, and FIG. 7 is a front view from the front of the inner peripheral working tool 55.

  6A shows a cross-sectional view of the rotating plate 30 as viewed in the direction of arrows AA in FIG. 4, and FIG. 6B shows a plan view of the rotating plate 30 in plan view. Further, in FIG. 6, the non-contact displacement sensor 5 and the diaphragm die 81 are illustrated by a two-dot chain line.

  As shown in FIG. 3 to FIG. 5, the press molding apparatus 1 is freely rotatable on a fixed base 10 that is placed and fixed on the floor, a lift 20 that moves up and down relative to the fixed base 10, and a lower surface of the lift 20. A rotary plate 30 mounted on the rotary plate, a rotary drive unit 40 for driving the rotary plate 30 to rotate, a non-contact displacement sensor 5 for detecting the rotational position of the rotary plate 30, and a spline forming unit fixed to the upper surface of the lifting platform 20 50, a top plate 60 constituting the upper part of the press molding apparatus 1, and a control device 70 for controlling each part.

  The fixed base 10 includes a substantially flat planar portion 11 having a predetermined thickness in the vertical direction and a leg portion 12 that extends downward from the vicinity of the four corners of the planar portion 11 and is fixed to the floor surface. doing. Further, an inner hollow mold cage 13 is fixed to the approximate center of the flat portion 11 with bolts (not shown). The mold cage 13 is formed in a shape that detachably accommodates a fixed mold 80 described later.

  Further, four guide rods 2 extending upward are provided at the four corners of the flat portion 11 of the fixed base 10. Furthermore, between the guide rods 2 adjacent to each other in the front-rear direction, a set of two dampers 3 that elastically support the lifting platform 20 from below is provided.

  The lifting platform 20 has a predetermined thickness in the vertical direction and is formed in a substantially flat plate-shaped lifting body portion 21 having a size substantially equal to that of the fixed base 10 in plan view, and guide rods at four corners of the lifting body portion 21. 2 is formed integrally with a rod insertion portion 22 having a substantially cylindrical shape that allows insertion of 2.

  Further, the lifting body 20 of the lifting platform 20 has an introduction hole 23 for introducing an inner peripheral working tool 55 of a spline forming unit 50 to be described later, immediately above the mold cage 13 of the fixed base 10, and behind the introduction hole 23. It has a shaft hole 24 that pivotally supports a rotating plate 30 (a rotating shaft portion 35 described later) via a bearing.

  In addition, on the upper surface of the lifting platform 20, there are two first actuators 4 that are fixed in the vicinity of the left and right of the introduction hole 23 and extend upward. The first actuator 4 has a function of moving the lifting platform 20 up and down along the guide rod 2. The first actuator 4 has an arbitrary configuration such as a hydraulic actuator or an air actuator as long as the elevator 20 can be raised and lowered, and its operation is controlled by a control device 70 described later.

As shown in FIGS. 5 and 6, the rotary plate 30 includes a substantially disc-like disc portion 31 having a thickness in the vertical direction and a rotary shaft portion 35 connected to the center of the disc portion 31. Yes.
The disc portion 31 includes three openings 32 that are opened at equal intervals along the circumferential direction on the circumference facing the mold cage 13 in a state in which the disc portion 31 is rotatably mounted. Further, the lower end side of the three openings 32 is expanded to form a mold mounting part 33 for mounting a diaphragm mold 81 to be described later. In addition, a spur gear 34 that meshes with the rotation drive unit 40 is formed on the peripheral side surface of the disc part 31.

  The rotating shaft portion 35 is formed by integrating a substantially cylindrical shaft main body portion 36 whose longitudinal direction is the longitudinal direction and a detected portion 37 formed with a larger diameter than the shaft main body portion 36 in the vicinity of the upper end of the shaft main body portion 36. Is configured. Further, on the outer peripheral surface of the detected portion 37, linear portions 37a, 37b, and 37c that are substantially concave inward in the radial direction and extend in the vertical direction are provided between the opening 32 and the disc portion 31 that are adjacent in the circumferential direction. It is arranged at three places with the same interval as the central angle with the center. In addition, among the line portions 37a, 37b, and 37c, the depth to the inside in the radial direction of the line portion 37a is formed shallower than the depth to the inside in the radial direction of the line portions 37b and 37c.

  The rotating shaft 35 is rotatably mounted on the shaft hole 24 via a bearing from the upper surface of the lifting platform 20 so that the detected portion 37 is located on the upper surface side of the lifting platform 20. The disk portion 31 is connected so as not to be relatively rotatable on the lower surface side. At this time, in plan view, the rotation shaft 35 and the center of one of the three mold mounting parts 33 and the linear part 37a of the detected part 37 are positioned on a straight line passing through the center of the disk part 31. The disk part 31 is connected.

  The rotation drive unit 40 is configured by a drive motor (not shown) provided with a spur gear (not shown) that meshes with the spur gear 34 of the disc part 31, and the disc part 31 is instructed by a control device 70 described later. Has a function of rotating and stopping rotation in the circumferential direction. Four rotation driving units 40 are arranged on the lower surface of the lifting platform 20 along the outer periphery of the disk unit 31 in the rotating plate 30 with a predetermined interval.

  The non-contact displacement sensor 5 has a function of detecting the distance between the rotation shaft portion 35 and the detected portion 37 in a non-contact manner according to an instruction from the control device 70 described later. The non-contact displacement sensor 5 is connected to the line of the detected portion 37 at the rotational position of the rotary plate 30 where a fixed mold 80 (described later) housed in the mold cage 13 and a first diaphragm mold 81a of a diaphragm mold 81 (described later) face each other. It arrange | positions at the upper surface side of the raising / lowering stand 20 so that the strip part 37a may be opposed via predetermined spacing.

  As shown in FIGS. 4 and 5, the spline forming unit 50 is a second actuator 51 that lifts and lowers the piston portion 52 from the lower end, and the second actuator 51 that supports the second actuator 51 via a predetermined distance from the upper surface of the lifting platform 20. A plurality of cylindrical support portions 54 and an inner peripheral processing tool 55 attached to the lower end of the piston portion 52 of the second actuator 51 are configured.

  Further, a guide plate 53 that allows insertion of one of the plurality of support portions 54 is attached to the tip of the piston portion 52. The second actuator 51 allows the piston portion 52 to move up and down along the support portion 54 inserted through the guide plate 53. The second actuator 51 has an arbitrary configuration such as a hydraulic actuator or an air actuator as long as it can be moved up and down, and its operation is controlled by the control device 70 described later.

  As shown in FIG. 7, the inner peripheral processing tool 55 can be inserted into the first shaft portion 55 a formed in the outer peripheral shape substantially the same as the inner peripheral shape of the introduction hole 23, the opening portion 32, and the drawing die 81. The second shaft portion 55b having a large shaft diameter, the third shaft portion 55c having a shaft diameter that can be inserted into the connection portion 114 in the third press-formed product 110c, and the female spline 115 are formed on the inner peripheral surface of the connection portion 114. The processing blade 56 to be formed is integrated in this order.

  As shown in FIGS. 3 and 5, the top plate 60 is disposed above the lifting platform 20 and constitutes a ceiling portion of the press molding apparatus 1, and holds the upper ends of the guide rod 2 and the first actuator 4. ing. Further, a top plate opening 61 that allows the second actuator 51 to be inserted is formed at a position facing the second actuator 51.

  The control device 70 is disposed on the right side surface of the press molding apparatus 1 and is configured with a hardware configuration such as a CPU, a memory, various operation switches, and a display, and a software configuration such as a program. The control device 70 has a function of accepting an input operation by an operator and a function of collectively controlling operations of the non-contact displacement sensor 5, the rotation drive unit 40, the first actuator 4, the second actuator 51, and the like. doing.

Next, one fixed mold 80 mounted on the mold cage 13 and three diaphragm molds 81 mounted on the rotating plate 30 will be described.
The fixed mold 80 is formed in a substantially cylindrical shape having an outer diameter substantially the same as the inner diameter of the mold cage 13. Further, the fixed die 80 has an inner peripheral shape substantially the same as an outer peripheral shape in a range corresponding to the front shape portion 111 in the primary molded product 110 and the large diameter portion 112 of the upper shaft 130. In addition, the upper part of the inner peripheral surface of the fixed mold 80 is expanded in diameter so that the lower end of the diaphragm mold 81 can be inserted.

  The three aperture dies 81 include a flange portion (not shown) having substantially the same diameter as the die mounting portion 33 of the disk portion 31 and a substantially cylindrical main body portion (not shown) having an outer diameter that can be inserted into the fixed die 80. And are integrated. And the shape of the inner peripheral surface of the aperture die 81 is formed in a different shape. The three diaphragm dies 81 having different shapes of the inner peripheral surface are respectively referred to as a first diaphragm mold 81a, a second diaphragm mold 81b, and a third diaphragm mold 81c.

The first drawing die 81a has the same inner peripheral shape as the outer peripheral shape of the first reduced diameter portion 114a and the first reverse tapered portion 113a of the first press-formed product 110a.
The second drawing die 81b has the same inner peripheral shape as the outer peripheral shape of the second reduced diameter portion 114b and the second reverse tapered portion 113b of the second press-formed product 110b.
The third aperture type 81 c has the same inner peripheral shape as the outer peripheral shape of the reverse tapered portion 113 and the connecting portion 114 in the upper shaft 130.

  The first aperture die 81a, the second aperture die 81b, and the third aperture die 81c are detachably attached to the die mounting portion 33 of the disc portion 31 with bolts or the like (not shown). At this time, the first diaphragm die 81a is attached to the mold insertion portion 33 located on a straight line passing through the center of the linear portion 37a and the disc portion 31 of the detected portion 37 in plan view, and the first in plan view. The second diaphragm die 81b is mounted on the mold mounting portion 33 adjacent to the diaphragm mold 81a in the clockwise direction. Similarly, the third diaphragm mold 81c is mounted on the mold mounting portion 33 adjacent to the second diaphragm mold 81b in the clockwise direction. Wearing.

  With reference to FIGS. 8 to 15, the operation of acquiring the secondary molded product 120 by performing the press molding of the primary molded product 110 stepwise using such a press molding apparatus 1 will be specifically described.

  8 shows a cross-sectional view of a state where the primary molded product 110 is set on the fixed die 80, FIG. 9 shows a cross-sectional view of the press-formed state in the first pressing step, and FIG. 10 shows the second drawing die 81b. FIG. 11 shows a cross-sectional view of the press forming state in the second press step, and FIG. 12 shows a cross-section of the press forming device 1 in the state of switching to the third drawing die 81c. FIG. 13 shows a cross-sectional view of the press forming state in the third press step, FIG. 14 shows a cross-sectional view of the press forming state in the fourth press step, and FIG. 15 shows a state after the completion of the fourth press step. A cross-sectional view is shown.

  First, as shown in FIG. 8, the control device 70 causes the lifting platform 20, the rotary plate 30, and the inner peripheral processing tool 55 to be moved to the initial positions by the operator's input operation for setting each part of the press molding apparatus 1 to the initial positions. Move to.

  Specifically, according to an instruction from the control device 70, the first actuator 4 moves the lifting platform 20 upward, the second actuator 51 moves the inner peripheral processing tool 55 upward via the piston portion 52, Stop at the initial position.

  Further, according to an instruction from the control device 70, the rotation driving unit 40 drives an internal drive motor or the like to rotate the rotation plate 30 via the spur gear 34 of the disk unit 31. Further, the non-contact displacement sensor 5 detects the distance from the detected portion 37 that rotates and outputs the detected distance to the control device 70.

  And the control apparatus 70 detects the linear part 37a, the linear part 37b, or the linear part 37c from the change of the distance with the to-be-detected part 37. FIG. At this time, when the linear portion 37a is detected, the rotation driving unit 40 stops the rotation of the rotating plate 30 by stopping the driving motor in accordance with an instruction from the control device 70, and immediately above the fixed mold 80. The single aperture die 81a is moved.

  Thereafter, the operator inserts the primary molded product 110 shown in FIG. 2 into the fixed mold 80 from above the mold cage 13. The primary molded product 110 inserted into the fixed mold 80 is held and fixed to the fixed mold 80 with the vicinity of the upper end exposed as shown in FIG.

  After the primary molded product 110 is set on the fixed mold 80, when press molding is started by an input operation by the operator, the first actuator 4 is repelled by the damper 3 as shown in FIG. Accordingly, the lifting platform 20 is moved downward until the first aperture die 81a and the fixed die 80 contact each other. At this time, the vicinity of the upper end of the primary molded product 110 exposed from the fixed mold 80 is inserted into the internal space of the first drawing die 81a, so that the vicinity of the upper end of the primary molded product 110 is squeezed in the radial direction.

When the fixed die 80 and the first aperture die 81a contact each other in the vertical direction, the first actuator 4 moves the lifting platform 20 to the initial position in accordance with an instruction from the control device 70. At this time, the lifting platform 20 is assisted in the upward movement by the repulsive force of the damper 3.
In this way, the press molding apparatus 1 completes the first press step of press molding the vicinity of the upper end of the primary molded product 110 with the first drawing die 81a, and obtains the first press molded product 110a.

  When the lifting platform 20 is raised to the initial position, the rotation drive unit 40 drives the drive motor and rotates the rotating plate 30 counterclockwise in plan view as shown in FIG. And if the non-contact displacement sensor 5 detects the linear part 37b, according to the instruction | indication of the control apparatus 70, the rotation drive part 40 will stop the rotation of the rotating plate 30 by stopping the drive of a drive motor, and a fixed type | mold. The second aperture die 81b is moved immediately above 80.

  Thereafter, in accordance with an instruction from the control device 70, the first actuator 4 lowers the lifting platform 20 until the second diaphragm die 81b and the fixed die 80 abut against the repulsive force of the damper 3, as shown in FIG. Move to. At this time, the first press-formed product 110a exposed from the fixed die 80 is inserted into the internal space of the second drawing die 81b, thereby narrowing the first reduced diameter portion 114a and the first reverse tapered portion 113a in the radial direction. To mold.

When the fixed die 80 and the second aperture die 81b come into contact with each other in the vertical direction, the first actuator 4 moves the lifting platform 20 to the initial position in accordance with an instruction from the control device 70. At this time, the lifting platform 20 is assisted in the upward movement by the repulsive force of the damper 3.
Thus, the press molding apparatus 1 completes the second pressing step of press molding the first reduced diameter portion 114a and the first reverse tapered portion 113a of the first press molded product 110a with the second drawing die 81b. The second press-formed product 110b is acquired.

  When the lifting platform 20 is raised to the initial position, the rotation driving unit 40 drives the drive motor to rotate the rotating plate 30 counterclockwise in plan view as shown in FIG. And if the non-contact displacement sensor 5 detects the linear part 37c, according to the instruction | indication of the control apparatus 70, the rotational drive part 40 will stop the rotation of the rotating plate 30 by stopping the drive of a drive motor, and a fixed type | mold. The third aperture die 81c is moved immediately above 80.

  Thereafter, in accordance with an instruction from the control device 70, the first actuator 4 moves the lifting platform 20 downward until the third diaphragm die 81c and the fixed die 80 abut against the repulsive force of the damper 3, as shown in FIG. Move to. At this time, the second press-formed product 110b exposed from the fixed die 80 is inserted into the internal space of the third drawing die 81c, thereby narrowing the second reduced diameter portion 114b and the second reverse tapered portion 113b in the radial direction. To mold.

  In this way, the press molding apparatus 1 completes the third pressing step of press molding the second reduced diameter portion 114b and the second reverse tapered portion 113b of the second press molded product 110b with the third drawing die 81c, The third press-formed product 110c is acquired.

  Thereafter, in a state in which the third press-formed product 110c is constrained by the fixed die 80 and the third drawing die 81c, the second actuator 51, as shown in FIG. The piston portion 52 is moved downward until the first shaft portion 55a and the introduction hole 23 come into contact with each other.

  At this time, the processing blade 56 of the inner peripheral processing tool 55 is inserted into the internal space of the third press-formed product 110c through the introduction hole 23, the opening 32, and the internal space of the third drawing die 81c. When the first shaft portion 55 a of the inner peripheral processing tool 55 and the introduction hole 23 come into contact with each other, the processing blade 56 of the inner peripheral processing tool 55 reaches the internal space of the reverse tapered portion 113.

  When the processing blade 56 of the inner peripheral processing tool 55 reaches the internal space of the reverse taper portion 113, the second actuator 51 receives the inner peripheral addition via the piston portion 52 as shown in FIG. The tool 55 is moved to the initial position. At this time, the female spline 115 is formed on the inner peripheral surface of the connection portion 114 by pulling out the processing blade 56 from the third press-formed product 110c.

When the inner peripheral working tool 55 moves to the initial position, the first actuator 4 moves the lifting platform 20 to the initial position in accordance with an instruction from the control device 70. At this time, the lifting platform 20 is assisted in the upward movement by the repulsive force of the damper 3.
In this way, the press molding apparatus 1 completes the fourth press step of molding the female spline 115 on the inner peripheral surface of the connection portion 114 of the third press molded product 110c, and acquires the secondary molded product 120.

The press molding apparatus 1 and the press molding method that realize the operation as described above are highly safe and can press-mold the primary molded product 110 efficiently.
Specifically, by attaching a plurality of drawing dies 81 to the disk portion 31 with respect to the slide plate protruding from the press forming apparatus 1 every time the drawing die is switched, a part of the disk portion 31 is temporarily attached to the device. Even when the drawing die 81 is switched in a state of protruding from the press, the protruding amount of the disk portion 31 protruding from the press molding apparatus 1 can be made constant. For this reason, the press molding apparatus 1 can reduce the space required for installation, can ensure safety with respect to the surroundings, and can safely switch the plurality of drawing dies 81.

  Further, in order to switch the plurality of drawing dies 81 by rotating the disc portion 31 with respect to one fixed die 80, the press molding apparatus 1 is configured so that the disc portion 31 and the fixed base 11 at the rear of the rotary shaft portion 35 A large free space can be formed between them. For this reason, it is possible to safely and easily perform the attachment / detachment or the like of the diaphragm 81, which is a heavy object, in this open space. Thereby, the press molding apparatus 1 can improve the safety in attaching and detaching the drawing die 81 with respect to the disc part 31.

In addition, by detecting the linear portions 37a, 37b, or 37c with the non-contact displacement sensor 5, the press molding apparatus 1 can efficiently switch the drawing die 81.
More specifically, when the diaphragm plate 81 is switched by rotating the rotating plate 30 using a servo motor, a loss occurs in the time until the rotation of the rotating plate 30 is stopped by feedback control of the servo motor.

  On the other hand, when the diaphragm die 81 is switched using the non-contact displacement sensor 5, the feedback control can be made unnecessary, so that the time until the rotation of the rotating plate 30 is stopped can be shortened. Thereby, the press molding apparatus 1 can switch the drawing die 81 efficiently and reliably. For this reason, the press molding apparatus 1 can efficiently press-mold the primary molded product 110.

  And after the 3rd press process, by moving the 2nd actuator 51 which attached inner peripheral processing tool 55 below, press molding device 1 takes out primary molded product 110 inserted in fixed mold 80, The molding of the outer peripheral shape and the processing of the inner peripheral surface can be performed by a series of operations.

  Further, since the third drawing die 81c used for the third press step of press molding and the first drawing die 81a used for the first press step are mounted adjacent to each other in the circumferential direction on the disc portion 31, Compared to the case of the slide plate moving in the direction, the press molding apparatus 1 can return the disk portion 31 to the initial position in the rotation direction in a short time.

Thereby, even if there is one fixed die 80, the time required to start press molding of the next primary molded product 110 can be shortened. For this reason, it is possible to perform press molding more efficiently and continuously with a lower mold cost than when a plurality of fixed molds 80 are used.
Therefore, the press molding apparatus 1 and the press molding method have high safety with respect to the surroundings and can perform press molding efficiently.

Further, by operating the second actuator 51 downward in the fourth press step, the operation notifies the surroundings that the stepwise press forming for one primary molded product 110 is the fourth press step. be able to.
Specifically, in the stepwise press molding using the drawing die 81 having the same outer peripheral shape and the rotating plate 30, there is a possibility that it is difficult to understand which stage the pressing process is.

Therefore, by performing spline molding on the inner peripheral surface in the fourth pressing step, the worker can easily grasp that the press molding is in the final stage. Thereby, the press molding apparatus 1 can aim at the improvement of the safety | security with respect to the circumference | surroundings.
Therefore, the press molding apparatus 1 can easily know that it is the fourth pressing step by the operation, and can improve safety.

  Further, by forming the spur gear 34 that meshes with the rotation drive unit 40 on the peripheral side surface of the disk unit 31, the press molding apparatus 1 rotates the disk unit 31 with a small driving force, and the rotation drive unit. The load on 40 can be reduced.

  Specifically, the weight of the disc portion 31 on which the plurality of aperture dies 81 are mounted is greatly increased. For this reason, for example, when the driving force is directly transmitted to the rotating shaft portion 35 to rotate the disc portion 31, a large driving force is required. Therefore, by forming the spur gear 34 on the peripheral side surface of the disc portion 31, the driving force required for the rotation of the disc portion 31 can be made smaller than when the driving force is directly transmitted to the rotating shaft portion 35. can do.

  Furthermore, when the driving force is directly transmitted to the rotating shaft portion 35, if the disk portion 31 is stopped from rotating, the rotating shaft portion 35 may be greatly twisted due to the rotational inertia of the rotating plate 30, and a problem may occur. On the other hand, since the spur gear 34 is formed on the peripheral side surface of the disc portion 31, even if the disc portion 31 is stopped from rotating, there is little possibility that a large twist occurs in the rotating shaft portion 35.

In addition, when the rotation driving unit 40 is provided so as to transmit the driving force directly to the rotation shaft unit 35, a reaction force against pressing during press molding may be transmitted to the rotation driving unit 40, thereby causing a problem. On the other hand, the reaction force at the time of press molding can be made difficult to be applied to the rotation drive unit 40 by meshing the rotation drive unit 40 with the spur gear 34 of the disc part 31. For this reason, the press molding apparatus 1 can reduce a possibility that a malfunction occurs in the rotational drive unit 40 due to a reaction force during press molding.
Therefore, the press molding apparatus 1 can improve not only safety but also reliability.

  In the above-described embodiment, the press forming apparatus 1 in which the fixing base 10, the lifting base 20, the rotating plate 30, and the spline forming portion 50 are arranged in the vertical direction is used. However, the present invention is not limited thereto. It may be a press molding apparatus 1 in which the base 20 and the spline molding unit 50 are arranged in the horizontal direction. At this time, the lifting platform 20 and the inner peripheral working tool 55 are configured to move in the horizontal direction by the first actuator 4 and the second actuator 51, respectively.

  Moreover, although the example which press-molds the upper shaft 130 was demonstrated, it is not limited to this, What is necessary is just a molded product obtained by press-forming the plastic metal pipe 100 stepwise and performing spline processing on the inner peripheral surface. .

  Further, although the press process has been described with four stages, the present invention is not limited to this, and the number of stages may be an appropriate number of stages according to the shape of the secondary molded product, such as three stages or five stages. At this time, the number of linear portions corresponding to the number of stages of the pressing process is formed in the detected portion 37.

  In addition, the shaft main body 36 and the detected portion 37 of the rotating shaft portion 35 are integrally formed. However, the present invention is not limited to this, and the shaft main body 36 and the detected portion 37 are configured separately and cannot be rotated relative to each other. It is good also as a structure to connect.

  In addition, although the position of one die mounting portion 33, the linear portion 37a, and the non-contact sensor 5 of the disc portion 31 is arranged on a straight line passing through the center of the disc portion 31 in a plan view, the present invention is not limited to this. First, the positional relationship between the linear portion 37a and the non-contact sensor 5 in the state where the fixed die 80 and the first aperture die 81a face each other is acceptable.

  Moreover, although the rotation position of the disc part 31 was detected by the linear parts 37a, 37b, and 37c, and the non-contact displacement sensor 5, it is not limited to this, The rotation drive part 40 is equipped with a servomotor, You may use together with the detection of the rotation position of the disc part 31. FIG.

In correspondence between the configuration of the present invention and the above-described embodiment,
The cylindrical body of the present invention corresponds to the primary molded product 110, the first press molded product 110a, the second press molded product 110b, and the third press molded product 110c of the embodiment,
Similarly,
The longitudinal direction corresponds to the vertical direction,
The through hole corresponds to the opening 32,
The rotating plate corresponds to the disc portion 31,
The rotation drive means corresponds to the rotation drive unit 40,
The detection means corresponds to the non-contact displacement sensor 5,
The switching means corresponds to the control device 70,
The moving means corresponds to the first actuator 4 and the lifting platform 20,
The inner peripheral processing portion corresponds to the inner peripheral processing tool 55,
The spline corresponds to the female spline 115,
The spline forming means corresponds to the second actuator 51,
The final stage corresponds to the fourth pressing process,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Press molding apparatus 4 ... 1st actuator 5 ... Non-contact displacement sensor 20 ... Elevating stand 31 ... Disc part 32 ... Opening part 34 ... Spur gear 35 ... Rotating shaft part 37a, 37b, 37c ... Line part 40 ... Rotation Drive unit 51 ... second actuator 55 ... inner peripheral working tool 56 ... processing blade 70 ... control device 80 ... fixed die 81 ... drawing die 81a ... first drawing die 81b ... second drawing die 81c ... third drawing die 110 ... 1 Next molded product 110a ... first press molded product 110b ... second press molded product 110c ... third press molded product 115 ... female spline

Claims (4)

One fixed mold for fixing one end of the cylindrical body in the longitudinal direction;
In order to move in the longitudinal direction and press-mold the other end side of the cylindrical body stepwise, a press molding apparatus comprising a plurality of substantially cylindrical drawing dies having different inner peripheral shapes,
A rotary plate having a substantially disk shape having a thickness in the longitudinal direction, and having the plurality of diaphragm dies mounted along a circumferential direction of a plane opposed to the fixed mold, and having a through-hole conducting to the plurality of diaphragm dies. When,
The center of the rotating plate has a substantially linear line portion that is arranged in the circumferential direction at substantially the same interval as the central angle between the drawing die adjacent in the circumferential direction and the center of the rotating plate, and extends in the longitudinal direction. A rotating shaft connected to be disabled relative rotation,
Rotation driving means for rotating the rotating plate in at least one of the circumferential directions; and
Detecting means for detecting the linear portion in a non-contact manner;
When the detecting means detects the linear portion, switching means for stopping the rotation of the rotating plate by the rotation driving means and switching the aperture type;
Moving means for moving the rotating plate, which has stopped rotating, in the longitudinal direction and press-molding the other end side of the cylindrical body;
An inner peripheral processing part having a processing blade for forming a spline on the inner peripheral surface of the cylindrical body at the tip;
With respect to the cylindrical body constrained by the fixed mold and the drawing mold, the inner peripheral processed portion is inserted into the inner peripheral surface of the cylindrical body from the through hole along the longitudinal direction to form a spline. A press forming apparatus comprising spline forming means for forming. The spline forming means,
The press molding apparatus according to claim 1, wherein the cylindrical body fixed by the fixed mold is inserted into an inner peripheral surface of the cylindrical body at a final stage of press molding. A spur gear that meshes with the rotation driving means is formed on the peripheral side surface of the rotating plate,
The rotation driving means;
The press molding apparatus according to claim 1 or 2, wherein the rotary plate is rotated by meshing with the spur gear of the rotary plate. One fixed mold for fixing one end side in the longitudinal direction of the cylindrical body, and substantially cylinders having different inner peripheral shapes for moving in the longitudinal direction and press-molding the other end side of the cylindrical body in stages. A press molding method using an apparatus having a plurality of squeezed dies,
A rotary plate having a substantially disk shape having a thickness in the longitudinal direction, and having the plurality of diaphragm dies mounted along a circumferential direction of a plane opposed to the fixed mold, and having a through-hole conducting to the plurality of diaphragm dies. A rotating shaft portion having a substantially linear filament portion disposed in the circumferential direction at substantially the same interval as a central angle between the drawing die adjacent in the circumferential direction and the center of the rotary plate at the center of the longitudinal axis. Is connected to the center of the rotating plate in a relatively non-rotatable manner,
With the rotational drive means, the rotational plate is rotationally driven in at least one of the circumferential directions,
When the detecting means for detecting the linear portion in a non-contact manner detects the linear portion, the switching means stops the rotation of the rotating plate by the rotation driving means and switches the aperture type,
With the moving means, the rotating plate stopped rotating is moved in the longitudinal direction to press the other end side of the cylindrical body, and
An inner peripheral processing portion having a processing blade for forming a spline on the inner peripheral surface of the cylindrical body at the tip by spline forming means with respect to the cylindrical body restrained by the fixed die and the drawing die. A press molding method in which a spline is molded by being inserted into an inner peripheral surface of the cylindrical body along the longitudinal direction from a through hole.

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