JP2018130731A - Correction method of linear workpiece and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly accurate correction method in which a workpiece extended with pressure applied in the correction direction is moved in the longitudinal direction by the tensile force of not causing plastic deformation, and thereby the composition of the workpiece is not greatly deteriorated, and provide a simple correction device of highly efficient type.SOLUTION: A correction method of a linear workpiece and its device are provided for correcting the workpiece in the state where the tensile force is applied in the workpiece longitudinal direction by clamps 16, 16a clamping both ends of a workpiece W while applying the pressing force in the strain correction direction by a correction ram 7 of a pushing mechanism 8. When the correction ram 7 of the pushing mechanism 8 stretches the workpiece W by the pressing force in the workpiece longitudinal direction, one clamp 16 is drawn and moved in the workpiece longitudinal direction by the tensile force of not causing plastic deformation in the workpiece W, and thereby the workpiece is corrected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a straight workpiece correcting method and apparatus for pressing a workpiece while clamping both ends of the workpiece and applying a tensile force.

Conventionally, a workpiece (plate) of a specified length is clamped at both ends by a clamp (jaw), and a tensile force is applied in the workpiece longitudinal direction, and pressure is applied in the strain correction direction by the correction ram (edge pusher) of the pressing mechanism. A workpiece correcting method and an apparatus for correcting the workpiece while correcting are already known. (For example, Patent Document 1)
This straightening device is pulled by the movement of the clamp until the strain (warp) in the longitudinal direction of the metal plate becomes zero, and in this state, the straightening ram is pushed up in the straightening direction (plate thickness direction), thereby partially straining the workpiece. A correction work is performed by applying a pressing force.

JP-A-62-227524

The straightening device disclosed in Patent Document 1 is pulled until the strain in the longitudinal direction becomes zero, and the straightening ram is pushed up in the straightening direction (thickness direction) to correct the partial strain. Therefore, the aluminum used with plastic deformation is used. A workpiece such as a plate has an advantage that it can be used appropriately.
However, the straightening method described above is manufactured, for example, as a steel wire having a wire diameter of about 5 to 20 mm made of various steel materials produced at an ironworks, and the winding shape at the time of shipment from the factory is wound to a diameter of about 1000 mm. This is inadequate when various processed wires are straightened as sample work for checking and confirming tensile strength and composition.

  That is, when a wire having a winding shape diameter of about 1000 mm is cut to a test piece length of about 400 to 600 mm, the radius of curvature of the steel wire piece work is about 500 mm, so that the steel wire is hard and has a high elastic modulus. Clamping a single workpiece and pulling it until the strain becomes zero requires a large amount of power, so that the structure of the apparatus becomes large, and it becomes difficult to obtain a compact inspection machine that is required to be used in a test chamber. In addition, when the steel wire piece work as described above is pressed for the purpose of springback with a straightening ram under an excessive tensile force that eliminates strain, various steel material properties are deteriorated or broken due to changes in the internal structure. There is a drawback that a trouble easily occurs due to plastic deformation such as, and there is a problem that accurate inspection (test) data cannot be obtained with a workpiece having a plastic deformation portion.

  In addition, a specimen made of a hard steel wire rod having a large curvature and a curved strain is not subject to slipping or rebounding phenomenon at the ram pressing part, work damage, etc. It is easy to accompany, and it is difficult to correct without preventing this and causing plastic deformation. Therefore, when using the straightening device as described above, a plurality of workers grip the work with a vise and perform the partial straightening work together with the gripping hammering means using a hammer, leading to deterioration of the surface of the wire due to the hammering. At the same time, there is a problem of requiring labor and skill.

In order to solve the above problems, the linear workpiece straightening method and apparatus according to the present invention include:
First, the workpiece W having a predetermined length is applied with a pressing force in the distortion correction direction by the correction ram 7 of the pressing mechanism 8 in a state where a tensile force is applied in the workpiece longitudinal direction by the clamps 16 and 16a clamped at both ends. In the straightening method for linear workpieces
When the correction ram 7 of the pressing mechanism 8 extends the workpiece W in the longitudinal direction of the workpiece by applying pressure, the clamp 16 is corrected by pulling and moving the clamp 16 in the longitudinal direction of the workpiece by a tensile force that does not cause plastic deformation of the workpiece W. It is characterized by.

  Second, when the straightening ram 7 presses the workpiece W to the workpiece straight position, the spring back pressure of the workpiece W is applied while the movement of the clamp 16 of the tension mechanism 17 is stopped on the spot. It is a feature.

  Third, when the correction ram 7 presses the workpiece W from the workpiece straight position to perform springback correction and pressurization, the advance / retreat drive unit 24 is moved freely or a predetermined amount, and the clamps 16 and 16a are clamped. By releasing or loosening the state, it is characterized in that after the tension and clamping of the workpiece W are released, the workpiece is pressed by the correction ram 7.

Fourth, a tension mechanism 17 that applies a tensile force in the longitudinal direction of the workpiece while clamping both ends of the workpiece W having a predetermined length by the clamps 16 and 16a, and a correction that applies pressure to the clamped workpiece W in the correction direction. In a linear workpiece straightening device comprising a pressing mechanism 8 having a ram 7,
When the correction ram 7 of the pressing mechanism 8 applies pressure to the workpiece W, the clamp 16 of the tension mechanism 17 pulls in the workpiece longitudinal direction with a tensile force that does not cause plastic deformation of the workpiece W. It is characterized by being configured to move.

  Fifthly, the clamps 16 and 16a for clamping both ends of the workpiece W having distortion are provided on both sides of the table 14 which can be detachably attached to the bed 2 facing the pressing mechanism 8 with a support interval L. The clamp 16 is configured to be capable of being pulled and moved in the longitudinal direction of the workpiece.

  Sixth, a workpiece receiving seat 22 for receiving and supporting both ends of the workpiece W is provided on the lower side of the clamp openings of the clamps 16 and 16a.

  Seventh, the gauge member 26b of the correction gauge 26 formed along the workpiece shape after correction is provided on the workpiece W within the support interval L between the clamps 16 and 16a.

The straight workpiece correction method and apparatus according to the present invention for solving the above-described problems have the following effects.
(1) The workpiece material composition is increased in order to freely move the workpiece in the longitudinal direction by the tensile force that does not cause plastic deformation of the workpiece, as the amount of elongation of the workpiece that grows along with the pressing in the straightening direction by the straightening ram. High-precision correction work that does not deteriorate can be performed efficiently.

(2) Since the spring back pressure is applied while the both ends are fixed by the clamp at the workpiece straight state position, the workpiece is gripped at both ends, but the bending can be bent at both ends. Therefore, it is possible to perform correction work with high correction accuracy and high correction work efficiency.

(3) Prior to pressurizing the pulling back, the workpiece tension and gripping force are released while maintaining the workpiece straightness, and the springback pressure is applied with both ends free. It is possible to carry out correction work without causing any problems.

(4) When the correction ram of the pressing mechanism extends the workpiece in the workpiece longitudinal direction by applying pressure, one clamp can be smoothly pulled and moved in the workpiece longitudinal direction by a tensile force that does not cause plastic deformation in the workpiece. A simple and inexpensive high-efficiency straightening device that does not cause plastic deformation or compressive strain in the workpiece can be obtained.

(5) Since it is configured as a tension unit in which both clamps having a support interval, a tension mechanism, and a table are integrated, the pressing position between the correction ram and the workpiece can be freely changed, and a tension unit with a different correction specification can be used. It can be freely selected and attached, and various correction operations can be performed easily and inexpensively.

(6) Since the end side of the workpiece that is bent downward with the curved middle part of the workpiece placed in the upper position can be inserted into the clamp opening while being supported by each workpiece receiving seat, The height position can be reliably clamped and tightened to facilitate the correction work.

(7) When checking the degree of distortion and correction of the work by visual inspection, it is possible to see the appearance of the work in comparison with the gauge member, so there is no error in the initial set state of the work and the corrected condition. It can be easily confirmed.

1 is an overall front view showing a correction device to which the present invention is applied. It is a right view of FIG. It is a top view which shows the structure of the correction operation part of FIG. It is an enlarged right side view of a correction ram and a gauge member. It is a front view which shows the structure of a pressing mechanism and a tension | pulling unit. It is a top view which shows the aspect which sets a workpiece | work to a clamp. It is a top view which shows the aspect which the clamp clamped the workpiece | work. It is a front view which shows the aspect of the springback pressurization of a workpiece | work.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the straightening device 1 includes a bed portion 2 having a base portion and a column portion 3 standing behind the bed portion 4, and forms a device frame 4 according to the present invention on the horizontal surface of the bed 2. The tension unit 6 is provided so that the mounting position can be adjusted, and the column unit 3 is provided with a pressing mechanism 8 including a pressing device having a correction ram 7. The correction unit 9 is constituted by the tension unit 6 and the correction ram 7. .
This straightening device 1 is installed by linking an operation panel 11b as a driving unit that controls the operation of the device and a personal computer 11a disposed in the vicinity of the device. In addition, on both the left and right sides of the front lower part of the correction work section 9, there are provided two-hand-pressed start buttons 12, 12 and a stop button 13 between them.

First, the workpiece W which is a distortion correction target shown in the drawing is manufactured as a carbon steel or alloy steel wire at a steel mill with a wire diameter of 5 to 20 mm by hot or cold rolling, and this predetermined length of wire is 1000 mm in diameter. It is processed into a millimeter winding shape and shipped.
Then, the wire rod in the form of a wound wire is subjected to a check inspection (test) of the steel material functional characteristics, material, and the like by sampling inspection for each production lot or at the request of the user. In this wire rod test, the end portion of the wound wire rod is cut to a test piece length of about 400 to 600 mm, and a cut wire rod having a curved distortion with a curvature radius of about 500 mm is supplied as the workpiece W. It is straightened by the straightening device 1 capable of such a straightening method.

The workpiece W supplied to the straightening device 1 has a straight line tolerance of 5 mm or less, which is straightened by the straightening work, and the straightened straightened workpiece W is transferred to the sample inspection process (test process). You will receive a tensile test and various inspection analysis.
The workpiece W to be corrected by the apparatus is mainly a rod-like body or shaft body having a circular cross section made of metal, but the shape and size of the section are arbitrary, and the partial sections in the length direction are different. May be.

  Next, the configuration of each part of the correction apparatus 1 will be described. First, as shown in FIGS. 1 to 4, the pulling unit 6 holds and holds (holds) a work 14 by holding the work W on the left and right surfaces of the table 14, and a table 14 made of a thick plate having a plan view shape that can be attached to the bed surface. The rod-shaped clamps 16 and 16a for the round bar are arranged to be opposed to each other with a support interval L, and one (left side) clamp 16 is configured to move forward and backward in the workpiece extending direction. The clamps 16 and 16a are partly modified from commercially available electric or hydraulic drive type wedge chucks, so that they are easy to use and inexpensive and have a small device structure.

  In other words, each clamp 16, 16 a is accommodated in a groove chamber having an isosceles triangle shape in plan view formed on the clamp base 18, with a pair of wedge-shaped clamping plates 19 facing in the front-rear direction before and after the correction working portion 9. doing. The clamping plate 19 is configured to simultaneously open and close both fastening plates 19 in the front-rear direction via an opening and closing member 21a such as a rod from a clamp drive unit 21 such as a hydraulic cylinder fixed to the end of the clamp base 18. Yes. As a result, the clamps 16 and 16a facilitate the insertion and removal of the workpiece W from above in the clamp openings that open upward and laterally.

In the clamps 16 and 16a, the workpiece receiving surface in the clamp port can be the bottom surface of the clamp base groove chamber, but the workpiece end is positioned higher than the groove chamber bottom on the side of the clamp port (on the support interval L side). A work receiving seat 22 is provided which can receive and support the middle of the side.
With this configuration, when the workpiece W is inserted into the left and right clamp openings, the end corners (edge portions) of the left and right workpiece ends are inserted into the left and right clamp openings with the curved top portion positioned at the top. ) Can be supported at the position as low as possible of the height (vertical length) of the clamp opening without contacting the bottom surface of the clamp base 18, and both ends of the workpiece W are equal in the front-rear direction by the fastening plates 19, 19. It can be clamped and clamped conditionally. Accordingly, both ends of each workpiece W having different bending shapes can be quickly set on the workpiece receiving seat 22, and the workpiece W is always supported at an appropriate height position of the clamp opening closer to the inside than the workpiece end, thereby improving the correction accuracy. be able to.

  Further, the clamps 16 and 16a can securely hold the left and right fastening plates 19 with the curved portion on the upper side hanging down while keeping the workpiece end as low as possible within the height of the clamp opening. In other words, both ends of the workpiece W have a sufficient clamping length in the vertical direction within the clamp opening, and are firmly clamped and firmly gripped. Therefore, the corrected posture of the workpiece W in a side view is changed to a vertical standing posture. It can be held stably. Accordingly, even when a strong pressing force is applied to the curved top of the workpiece W in the standing posture, the correction ram 7 can receive an appropriate pressing force in the vertical direction and restricts the tilting of the workpiece W in the front-rear direction. Even if a strong spring reaction force (correction reaction force) occurs in the steel material, it is possible to perform smooth correction work by preventing the workpiece top from coming off from the correction ram 7 (linear workpiece removal phenomenon), that is, slipping and rebounding at the ram pressing part. To.

  In the above-described structure, a work insertion guide (not shown) smaller than the work diameter may be erected from the clamp base 18 side at a predetermined position on the base side from the tip of the clamp opening in the clamp openings of the clamps 16 and 16a. Desirably, in this case, the work W is guided to a fixed position in the clamp port by inserting the work W between the left and right work insertion guides, so that the work of clamping the work W can be seen and felt. The pinching lengths at both ends can always be made equal without reliance.

Next, the tension mechanism 17 comprised in the tension unit 6 is demonstrated with reference to FIG. 3, FIG. This pulling mechanism 17 is attached to a moving base 23 provided on the left side of the table 14 so as to be adjustable in the left-right direction. The clamp base 18 of the clamp 16 is attached to the left end of the moving base 23 through a rail structure. The advancing / retreating drive unit 24 such as a fixed hydraulic cylinder and the clamp base 18 are connected via a connecting member 24a such as a rod.
As a result, the tension unit 6 allows the left clamp 16 to move to and away from the clamp 16a attached and fixed on the right side via the tension mechanism 17, and the amount of correction of the workpiece W during the correction work by the control means described later. The tensile movement (retraction) associated with is automatically performed by a predetermined tensile force.

Further, the pulling unit 6 configured as described above can be provided with a correction gauge 26 as a correction work auxiliary device as shown in FIGS. 3 and 5 on the table 14 or the bed 2 so as to be attachable / detachable or forward / backward switchable. . The illustrated correction gauge 26 supports a flat gauge member 26b in a horizontal position when viewed from the front by an advancing / retreating switching mechanism 26a erected on the back side of the table 14, and the gauge member 26b The front straight side can be brought close to the workpiece W or below the workpiece, and the degree of distortion can be easily confirmed visually.
The gauge member 26b in the illustrated example is desirably provided so as to be positioned and held in a predetermined gauge posture by a stopper in a state where the gauge member 26b is rotatably supported on a support shaft of the advance / retreat switching mechanism 26a and is biased upward by a spring.

Since the correction gauge 26 having this configuration is made close to the clamped workpiece W, the degree of distortion can be quickly determined by visually checking the amount of curvature of the lower edge of the linear body through the horizontal straight plate surface of the gauge member 26b. Judgment can be made. Further, during the correction work accompanying the lowering of the correction ram 7, the gauge member 26 b retreats downward against the urging force of the spring, and then immediately takes a gauge posture as the correction ram 7 rises. There are advantages such as facilitating visual confirmation without hindering the correction work.
Note that the operation and operation amount of the gauge member 26b may be made recognizable by an electrical detection means such as an encoder or a display means. Further, the gauge structure is not limited to the configuration of the straight flat plate in the illustrated example, and may be a string-like member stretched sideways. Further, when the workpiece W has a corrected shape, for example, a predetermined bent shape, the gauge shape can be a line gauge that matches the corrected workpiece shape.

Next, the pressing mechanism 8 and the correction ram 7 installed in the column part 3 will be described with reference to FIGS. The pressing mechanism 8 includes a hydraulic cylinder having a hydraulic control unit or the like, and a corrective ram 7 having various pressing shapes is attached to the lower end of a pressing shaft 8a that moves up and down in a removable manner.
As shown in FIGS. 4 and 5, the correction ram 7 according to the embodiment forms a pressing portion 7 a having a downward fan shape in a front view and having a lower side curved with a predetermined width. Further, the pressing portion 7a forms a pressing surface 7b that contacts the front and rear surfaces of the work W equally by forming a concave groove having a triangular or semicircular arc shape in a side view.

  The straightening ram 7 having the above configuration is straightened when the pressing portion 7a is formed in a concave groove shape having an arcuate pressing width of one half or more of the support interval L by the clamps 16 and 16a and provided with both side pressing surfaces 7b. When the curved top portion of the pressing portion 7a comes into contact with the curved top portion of the workpiece W during the operation, pressing is started by a double-sided contact pressing action in which the both-side pressing surfaces 7b are securely in contact with both sides of the peripheral surface of the workpiece W. Thus, the range (area) of the double-sided contact pressing action with the pressing amount due to the downward movement of the correction ram 7 is utilized by the total length of the pressing portion 7a due to the correction reaction force such as the pressing load and the initial elastic load which are greatly generated in the initial pressing. Thus, the straightening action can be performed efficiently without causing stress concentration, and the above-described linear workpiece detachment phenomenon in which the top of the workpiece W is displaced from the pressing portion 7a can be prevented.

  The straightening device 1 is provided with a hydraulic unit and an electric control unit of the pulling mechanism 17 and the pressing mechanism 8 so as to be capable of linking control, and both control panels 11 are installed at appropriate positions in the device cover, and the workpiece W having the above specifications is provided. The mechanical specifications for performing the correction work by the correction method according to the present invention are as follows. That is, in the tension unit 6, the hydraulic cylinder specification of the advance / retreat drive unit 24 is a horizontal tension type of approximately 50 mm stroke, and the maximum tensile force is approximately 200 KN. In addition, the hydraulic cylinder specification of the pressing mechanism 8 is a vertical drive type of approximately 250 mm stroke control type, and the maximum pressurizing force is about 200 KN.

  On the other hand, the control specification is a type that can be automatically controlled and manually operated with data for each sample (test piece), and the data pattern is, for example, a sample functional material data table for each workpiece, various functions related to yield stress and correction (additional). (Pressing amount for each pressure and wire diameter, etc.) is input to a personal computer and created as a manual table such as a matrix, and based on the creation verification, an automatic readout method that can automatically display control items for each specimen is adopted. Thereby, for example, the operator can quickly grasp the pressing amount (springback pressing distance S, etc.) simply by inputting the wire diameter of the test piece to the control panel 11 or the personal computer 11a and efficiently perform the correction work by the correction device 1. It can be carried out. In addition, it is desirable that the operation operation of the correction ram 7 and the pulling mechanism 17 is configured to be able to perform an inching operation according to a predetermined pattern. In this case, the inching pattern can be selected based on the data for each test piece.

  Next, an operation mode and a correction method for correcting the workpiece W having the above specifications using the correction device 1 configured as described above will be described. First, the operator selects automatic operation or manual operation based on data input to the personal computer in advance, and inputs and confirms the pressing amount for each test piece obtained from the personal computer or the matrix. As a result, the correction device 1 enters the correction operation start state by selecting the correction operation pattern, the pressing force, the tensile force, the pressing amount, each speed, and the time for each process set for each workpiece W.

Next, the operator opens the apparatus cover and inserts and positions the gripped work W into the clamp openings of the clamps 16 and 16a in the correction work chamber 9, as shown in FIG. Then, after occupying the door, the start buttons 12 and 12 (see FIGS. 1 to 3) are pushed and operated with both hands to start the correction work.
The basic device operation at this time is as follows. First, the clamp plate 19 of the clamps 16 and 16a is closed by the advance of the hydraulic cylinder of the clamp drive unit 21 to grip both ends of the workpiece and hold the workpiece W in a predetermined standing posture. (FIGS. 7 and 1). After that, the hydraulic cylinder of the pulling mechanism 17 is linked to move the clamp 16 backward (moving to the left) to support the first pulling state.

  Next, the pressing mechanism 8 moves down the correction ram 7 from the standby position indicated by the solid line in FIG. 1 by the full stroke advance of the hydraulic cylinder, and enters the contact correction state position indicated by the solid line in FIG. After passing through the workpiece straight state position shown in FIG. 5 where the workpiece W is substantially linear, the spring back pressurization shown in FIG. 8 with a predetermined speed and time is shown in FIG. Pressurize to the spring back position. Then, as the hydraulic cylinder of the pressing mechanism 8 moves backward, the correction ram 7 rises at the set return process speed and returns to the original standby position and stops.

  In this way, the work W starts to be straightened from the contact straightening state position indicated by the solid line in FIG. 4 and becomes a straight posture through the work straightness state position shown in FIG. 8 is pushed down to the lower limit position of the pressing amount, that is, the spring back pressing distance S, and the spring back state position shown in FIG. To do.

  Note that the pressing amount (pressing amount) of the workpiece W in which the correction ram 7 is moved from the contact correction state position to the spring back state position in the pressurizing step is acquired from the input personal computer 11a, but is manually operated. In this case, the springback pressing distance S and the like can be determined by a plurality of visual pressing tries.

  On the other hand, the clamp pulling mechanism 17 that clamps both ends of the work W is a hydraulic cylinder of the advance / retreat drive unit 24 that is linked to the pressing amount of the correcting ram 7 and the work extending amount that expands with the correcting pressurization in the correction pressing step. However, in order to automatically move the clamp 16 backward, the clamp 16 is pulled and supported by a pulling force that does not cause plastic deformation of the workpiece W as the workpiece moves in the longitudinal direction.

  That is, when the straightening ram 7 is deformed so that the workpiece elongation amount is maximized at the workpiece straight state position where the distortion of the workpiece W having the bending distortion is substantially zero from the contact straightening state position, While applying (adding) a tensile force that does not cause plastic deformation to the workpiece W on which 16 extends, a predetermined tensile force (retraction force) that is optimally set for each material is pulled over a desired time. Can do.

As a result, the workpiece W extends from the contact correction state position having the support interval L to the maximum length at the workpiece straight state position without causing internal compressive strain due to applied pressure or sample plastic deformation due to tensile force. Correction is performed stably while maintaining the amount sequentially.
Therefore, it is possible to efficiently perform highly accurate correction work without greatly changing or deteriorating the material composition of the workpiece W.

  Further, almost simultaneously or immediately before the straightening ram 7 presses the workpiece W, the pulling mechanism 17 gives the workpiece W a tensile force that does not cause plastic deformation of the workpiece W. Therefore, it is possible to reliably prevent the compressive strain applied to the clamps 16 and 16a from the curved top portion and the occurrence of compressive strain generated in the wire due to the tensile movement of the clamp 16 at the initial stage of correction. Further, there is an advantage that the wire W is smoothly stretched in coordination with the pressurization of the straightening ram 7 and the workpiece W is straightened.

  Then, the straightening device 1 applies the spring back pressurization by the straightening ram 7 from the workpiece straight position (FIG. 5) to FIG. 8 by automatic operation based on the data input to the personal computer or the pressing amount for each wire obtained from the personal computer. The spring back correction pressurization can be performed by a predetermined amount with a predetermined pressurizing force and a set distance. In this case, if the advance / retreat drive unit 24 is moved in a free operation or a predetermined amount prior to pressurization, The tensile stress of W can be released.

  In addition, when the clamping of the clamps 16 and 16a is temporarily released or loosened, the tensile force and the clamping force (gripping force) can be released, and the correction of the workpiece W can be easily confirmed. . As a result, the workpiece W can be subjected to a clamp opening pressure correction process in which spring back pressure is applied while freeing both ends of the workpiece W, and the clamp grip portion is not bent at both ends of the workpiece W. Corrective work can be performed.

  On the other hand, in addition to the above-described correction mode, the correction device 1 corresponds to the length of the workpiece W having a sufficient bending margin of the clamp grip at both ends. It is possible to perform correction work with pressure selected. In this case, for example, when the straightening ram 7 presses the workpiece W to the workpiece straight position, the spring back pressure of the workpiece W is applied while the movement of the clamp 16 of the tension mechanism 17 is stopped on the spot. It is possible to perform a clamp fixing pressure method. Therefore, in this case, since the pressure is applied while both ends of the work W are fixed, the gripping portion is bent at both ends, but the pressure and the pressing amount with high correction efficiency are selected between the both to perform the correction easily and quickly. There are advantages that can be made.

As described above, the correction device 1 can select various springback pressurizations, and also performs plastic deformation (permanent deformation) during the springback processing by releasing the pressure and returning the pressure when the correction ram 7 is retracted (lifted). ) Can be performed, and the correction work within the correction error that has been corrected as much as possible is completed.
After this, the door is opened together with the machine stop and the notification of the display / operator 11b, the workpiece W is taken out from the correction work chamber 9, and a series of correction work and the next process setup are completed by moving to the next inspection process. Can do.

  As described above, in the workpiece correction method according to the present invention, the amount of elongation by which the correction ram 7 pressurizes the workpiece W to extend in the workpiece longitudinal direction, and the tensile force that does not cause plastic deformation of the workpiece W in the workpiece W is used. By moving in the direction and applying pressure while pulling, it is possible to make a non-plastic tension pressurization method that straightens, so that the composition of the work W is greatly deteriorated compared to the conventional work plastic tension pressurization correction technique. This makes it possible to correct a certain shape without any defects. Therefore, the corrected test piece is characterized in that, in the inspection process defined by JIS, various inspections such as strength and inspection of material characteristics can be easily performed without error data.

  In addition, although the workpiece | work W demonstrated the round bar and the shaft-shaped wire in embodiment, it is not restricted to this, The correction apparatus 1 can be adapted also to workpiece | work W, such as a square material and a flat plate material. The pulling mechanism 17 of the embodiment has an advantage of a simple and inexpensive configuration because only one clamp 16 is pulled and moved. However, if necessary, both the clamps 16 and 16a may be pulled and moved.

DESCRIPTION OF SYMBOLS 1 Straightening device 2 Bed 7 Straightening ram 8 Pressing mechanism 14 Table 16, 16a Clamp 17 Pulling mechanism 18 Clamp base 22 Work receiving seat 26 Straightening gauge 26b Gauge member L Support interval W Workpiece

Claims (7)

In a state where a tensile force is applied to the workpiece (W) of a predetermined length in the longitudinal direction of the workpiece by the clamps (16) and (16a) clamped at both ends, the strain correction direction is corrected by the correction ram (7) of the pressing mechanism (8). In the straightening method for linear workpieces that are straightened while applying pressure to the
When the straightening ram (7) of the pressing mechanism (8) extends the workpiece (W) in the longitudinal direction of the workpiece by the applied pressure, the workpiece longitudinal direction is applied to one clamp (16) by a tensile force that does not cause plastic deformation in the workpiece (W). A method of straightening a linear workpiece that is corrected by pulling in the direction.   When the straightening ram (7) presses the workpiece (W) to the workpiece straight position, the spring back of the workpiece (W) is stopped while the movement of the clamp (16) of the tension mechanism 1 (7) is stopped on the spot. The linear workpiece straightening method according to claim 1, wherein pressurization is applied.   When the correction ram (7) presses the workpiece (W) from the workpiece straight position to perform springback correction pressurization, the advancing / retreating drive unit (24) is moved freely or by a predetermined amount, and the clamp (16) , (16a) is released or loosened to release the tension and clamping of the workpiece (W) and then press the straight workpiece with the straightening ram (7). Method. A tension mechanism (17) that applies a tensile force in the longitudinal direction of the workpiece while clamping both ends of the workpiece (W) of a predetermined length by the clamps (16), (16a), and the clamped workpiece (W) in the correction direction In the straight workpiece straightening device including the pressing mechanism (8) including the straightening ram (7) for applying pressure,
When the straightening ram (7) of the pressing mechanism (8) applies pressure to the workpiece (W), the clamp (16) of the tension mechanism (17) causes plastic deformation of the workpiece (W). A straight workpiece straightening device configured to move in the longitudinal direction of the workpiece with no tensile force.   Clamps (16) for clamping both ends of a work (W) having distortion on both sides of a table (14) that can be detachably attached to the bed (2) facing the pressing mechanism (8). ), (16a) are disposed with a support interval (L), and one of the clamps (16) is configured to be movable in the longitudinal direction of the workpiece.   The straight workpiece correction according to claim 4 or 5, wherein a workpiece receiving seat (22) for receiving and supporting both ends of the workpiece (W) is provided on the lower side of the clamp opening of the clamps (16, 16a). apparatus.   The gauge member (26b) of the correction gauge (26) formed along the workpiece shape after correction on the workpiece (W) is provided in the support interval (L) between the clamps (16), (16a). The linear workpiece straightening device according to 4 or 5 or 6.

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