Rolling device

Abstract

Provided is a rolling device capable of easily correcting a relative position between a fixed flat die and a moving flat die. A rolling device 1 is provided with a control content for obtaining a testpiece by forming a fixed-side streak and a moving-side streak on a base material, and a control content for receiving an input of a positional deviation amount between a virtual groove center line of the fixed-side streak and a groove center line of the moving-side streak and calculating and outputting a correction movement amount for correcting the moving flat die 4 to the top dead center on the basis of the positional deviation amount. Further, the device is provided with a control content for receiving and outputting the input of a biting depth of the fixed-side streak and the moving-side streak of a testpiece. With such a configuration, the position of the top dead center of the moving flat die 4 can be easily adjusted on the basis of the positional deviation amount, and the position of the fixed flat die 3 in the facing direction can be easily adjusted on the basis of the biting depth.

Description

Rolling Equipment

[0001] The present invention relates to a rolling device that is mainly used for rolling threads and that is capable of correcting the relative position of a fixed flat die and a movable flat die.

[0002] 2. Description of the Related Art Conventionally, there have been known rolling pressure monitoring devices, such as that disclosed in Patent Document 1, that monitor the rolling pressure applied to a base material and determine whether or not the rolling has been performed appropriately.

[0003] Japanese Patent Application Laid-Open No. 2021-175576

[0004] In a thread rolling device, the relative positions of the fixed flat die and the moving flat die must be precise. Specifically, the trace of plastic deformation formed on the fixed flat die must match the trace of plastic deformation formed on the moving flat die. In particular, in the case of thread rolling, if the traces of plastic deformation are misaligned, the rolled product may not be viable as a finished product.

[0005] Conventionally, the correction of the positions of the fixed flat die and the movable flat die has relied heavily on skilled personnel, and even then, multiple tests have had to be repeated.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rolling device that can easily correct the relative positions of a fixed flat die and a movable flat die.

[0007] The present invention relates to a rolling device comprising: a fixed flat die fixed on a base table and having a fixed-side rolling surface; and a movable flat die arranged so as to be freely movable back and forth along the rolling direction on the base table and having a movable-side rolling surface that faces the fixed-side rolling surface during rolling. The rolling device further comprises a top dead center position adjusting means for manually adjusting the position of the top dead center of the movable flat die along the rolling direction; a forward movement of the movable flat die by moving the movable flat die by a predetermined amount along the rolling direction from the position of the top dead center to rotate the base material by half a turn; and a moving operation of the movable flat die at the top dead center position. and a test movement control means for automatically controlling the return movement of the movable flat die to return it to its original position, thereby obtaining a test piece in which a groove-shaped fixed-side striation based on the fixed-side rolling surface portion and a groove-shaped moving-side striation based on the moving-side rolling surface portion are respectively formed in the base material; and a test movement control means for receiving an input of a positional deviation amount of the moving-side striation from the appropriate position in a direction along the axis of the test piece, with the appropriate position of the moving-side striation being defined as a state in which the groove center line of the moving-side striation is positioned on a virtual groove center line formed by extending the groove center line of the fixed-side striation when the test piece is viewed from the front. and a corrective movement amount calculation control means having a control content for calculating the distance to the proper top dead center position of the movable flat die as a corrective movement amount of the movable flat die based on the inputted positional deviation amount; and further, at least one of the fixed flat die and the movable flat die is arranged so as to be positionally changeable along the facing direction in which the fixed side rolling surface portion and the movable side rolling surface portion face each other, and an opposing position adjustment means for manually adjusting the relative positions of the fixed flat die and the movable flat die in the facing direction; and the moving flat die in the opposing direction; a penetration input / output means for receiving input of the radial penetration depth of the test piece at the fixed side score and the moving side score of the test piece obtained by the test movement control means; and an adjustment value output means for outputting the correction movement amount calculated by the correction movement amount calculation control means, opposing position information based on the relative position in the opposing direction detected by the opposing position detection means, and the penetration depth received as input by the penetration depth input means.

[0008] In this configuration, first, the test movement control means forms a scratch on the base material within a required range, thereby obtaining a test piece in which the scratch is composed of a fixed-side scratch and a movable-side scratch. Then, the positional deviation amount between the fixed-side scratch and the movable-side scratch formed on the test piece is input using the positional deviation amount input means. The correction movement amount calculation control means then calculates a correction movement amount to the position of the movable flat die that will result in the appropriate position, and the calculated correction movement amount is output by the adjustment value output means. By adjusting the position of the top dead center of the movable flat die based on this correction movement amount, the top dead center position adjustment means can adjust the position of the top dead center to an appropriate position that aligns the fixed-side scratch and the movable-side scratch. In the present invention, the predetermined amount by which the base material is rotated half a turn to form each streak is proposed to be a configuration in which the base material is rotated approximately half a turn. Specifically, the base material may be rotated half a turn, or the base material may be rotated slightly more than half a turn so that the streaks do not overlap excessively and become impossible to measure, or the base material may be rotated slightly less than half a turn so that the streaks do not overlap. Preferably, the base material is rotated slightly less than half a turn so that the streaks do not overlap. Furthermore, the direction of rotation of the base material does not particularly matter, whether forward or reverse.

[0009] Furthermore, the relative positions of the fixed flat die and the movable flat die in the opposing direction can be adjusted by the opposing position adjustment means based on the penetration depth between the fixed-side and movable-side creases formed on the test piece and the information on the opposing positions of the fixed flat die and the movable flat die when the fixed-side and movable-side creases were formed. Here, the penetration depth determines the thread pitch and rolling pressure (the pressure exerted by the fixed flat die and the movable flat die during rolling). Therefore, by optimizing the penetration depth, the thread pitch can be matched and the rolling pressure can be optimized. This allows the thread pitch to be matched with high precision, thereby reducing the occurrence of pitch forming defects. Furthermore, rolling can be performed with an appropriate rolling pressure, thereby reducing the occurrence of slippage during rolling and reducing the occurrence of forming defects due to slippage. By optimizing the penetration depth in this way, the probability of forming defects during rolling (hereinafter referred to as the forming defect rate) can be reduced.

[0010] In this way, the configuration of the present invention adjusts the top dead center position of the moving flat die and the relative position of the moving flat die and the fixed flat die in the facing direction based on the fixed-side and moving-side marks formed on the test piece, thereby improving the thread rolling accuracy and reducing the rate of forming defects. Furthermore, with this configuration, the top dead center position of the moving flat die can be adjusted according to the correction movement amount, and the relative position in the facing direction can be adjusted using the facing position information and the penetration depth. This means that these adjustments can be made without relying on the experience or intuition of the operator, and the burden required for the adjustment work can be reduced. Therefore, threads can be formed stably to the desired product specifications with high precision, and high-quality threads can be consistently manufactured.

[0011] In the rolling device of the present invention described above, it is proposed that the adjustment value output means has a control content that displays the penetration depth inputted by the penetration depth input means on a specified display unit, and a control content that sequentially displays the opposing position information on the display unit in accordance with the position adjustment of the moving flat die in the opposing direction by the opposing position adjustment means.

[0012] In this configuration, the relative positions of the fixed flat die and the movable flat die in the opposing direction are adjusted by the opposing position adjusting means based on the bite depth and opposing position information displayed on the display unit, so that the relative positions can be adjusted to a position that provides the desired bite depth.In this way, the positions can be easily and stably adjusted to the relative positions that provide the bite depth suitable for the desired product specifications.

[0013] In this configuration, the adjustment value output means may include a corrected position information calculation means for calculating corrected position information indicating the relative position in the opposing direction that results in the desired penetration depth, based on the penetration depth input by the penetration depth input means and opposing position information when the fixed-side streaks and the moving-side streaks are formed on the test piece, and the corrected position information may be displayed on the display unit. With this configuration, the position can be adjusted to the desired penetration depth more easily and stably by operating the opposing position adjustment means in accordance with the corrected position information.

[0014] In the rolling device of the present invention described above, a configuration is proposed in which the adjustment value output means displays a movement amount corresponding graphic portion on a predetermined display portion, and the correction movement amount calculation control means generates the movement amount corresponding graphic portion according to the correction movement amount along directions perpendicular to the rolling direction of the moving flat die and the opposing directions of the fixed side rolling surface portion and the moving side rolling surface portion, and outputs the generated movement amount corresponding graphic portion to the adjustment value output means.

[0015] The movement amount corresponding graphic portion is displayed, for example, as a bar-shaped graphic extending to the left and right with the center at the correct position, and the amount of deviation of the current position of the movable flat die from the correct position is indicated within the graphic, and by moving the movable flat die, the graphic indicating the current position is matched with the graphic indicating the correct position. This allows the worker to work extremely easily based on visual information. The movement corresponding graphic portion can take various forms.

[0016] The rolling device of the present invention has the excellent effect of being able to easily correct the relative positions of the fixed flat die and the movable flat die.

[0017] 1 is a perspective view of a rolling device 1 according to an embodiment of the present invention, viewed from the side of a fixed flat die 3. FIG. 2 is a perspective view of the rolling device 1, viewed from the side of a movable flat die 4. FIG. 3 is a plan view showing an enlarged view of the fixed flat die 3. FIG. 4 is an explanatory diagram showing a mode of forming fixed-side scratches 62 and movable-side scratches 63 on a base material 60. FIG. 5 is an enlarged view of a portion of a test piece 61, and FIG. 6 is an enlarged view of a portion of a vertical cross section of the test piece 61. FIG. 6 is a schematic view of a position detection device 35 that detects the positions of the fixed flat die 3 and the movable flat die 4. FIG. 7 is an explanatory diagram showing a display mode of a correction graphic portion 81 on a touch panel 37. FIG. 8 is an explanatory diagram showing a display mode of bite depth and opposing position information on a touch panel 37.

[0018] The present invention will be described in detail below with reference to the following examples. Note that the present invention is not limited to the examples shown below, and design changes are possible as appropriate.

[0019] As shown in Figures 1 and 2, the rolling device 1 has a base table 2. On the base table 2, there are provided a fixed flat die 3 having a fixed-side rolling surface portion 11 and a movable flat die 4 having a movable-side rolling surface portion 21. The movable flat die 4 moves back and forth along the rolling direction. While the rolling device 1 is not operating, the movable flat die 4 is stopped at a standby position before rolling begins. Specifically, as shown in Figures 1 and 2, this standby position is a position spaced from the fixed flat die 3 in the rolling direction and is different from the rolling start position (top dead center) described below.

[0020] In this embodiment, the direction perpendicular to the rolling direction and in which the fixed-side rolling surface portion 11 and the movable-side rolling surface portion 21 face each other will be referred to as the facing direction (see FIGS. 1 and 2).

[0021] The fixed flat die 3 is fixed to the die block 25 by a clamping means (not shown). The die block 25 is fastened to the base table 2 by fastening bolts 10, 10, and with the fastening bolts 10, 10 fastened, the die block 25 and the fixed flat die 3 are immovably fixed to the base table 2.

[0022] The movable flat die 4 is immovable in the vertical and horizontal directions, and is movable back and forth in the rolling direction by a guide rail (not shown) arranged on the base table 2 along the rolling direction. A drive control device (not shown) is arranged on the base table 2, and the reciprocating movement of the movable flat die 4 is controlled by the drive control device.

[0023] As described above, when the rolling device 1 is not operating, the movable flat die 4 is stopped at the standby position located on one side of the rolling direction relative to the fixed flat die 3 (FIGS. 1 and 2), and is moved to the top dead center (described below) when rolling begins (FIG. 4(A)). During rolling, the movable flat die 4 is moved back and forth from the top dead center along the rolling direction, and after rolling is completed, the movable flat die 4 returns to the standby position. In addition, the configuration of this embodiment is provided with a correction bolt 8 for adjusting the position of the top dead center (position along the rolling direction) of the movable flat die 4 (FIG. 2). By rotating the correction bolt 8 forward or backward, the position of the top dead center of the movable flat die 4 can be freely adjusted along the rolling direction.

[0024] A guide path 19 is provided on one side of the fixed flat die 3 for feeding the base material 60 between the fixed flat die 3 and the movable flat die 4. The rolling device 1 of this embodiment rolls the base material 60 fed by this guide path 19 by squeezing it between the fixed-side rolling surface 11 of the fixed flat die 3 and the movable-side rolling surface 21 of the movable flat die 4, and then moves the movable flat die 4 back and forth in the rolling direction. In the rolling device 1 of this embodiment, a male thread is formed by rolling a substantially round bar-shaped base material.

[0025] In this embodiment, the configuration for reciprocating the movable flat die 4 (guide rails, drive control device, etc.), the fixed side rolling surface section 11, and the movable side rolling surface section 21, etc., can be configured in a conventional manner, so details thereof will be omitted.

[0026] Next, the essential parts of the present invention will be described. In this embodiment, as shown in Figures 1 and 2, a block position reference portion 26 is provided on a base table 2 to which the die block 25 is attached so as to be movable in the opposing direction. The die block 25 is movable in the opposing direction relative to the block position reference portion 26 (base table 2) when the fastening bolts 10 are loosened, and can slide in the opposing direction in this state. As a result, with the fixed flat die 3 fixed to the die block 25, the fixed flat die 3 and the die block 25 can be moved together in the opposing direction.

[0027] The block position reference portion 26 is provided with position conversion pull-out bolts 31, 31 at locations near both ends in the rolling direction. Position conversion press bolts 32, 32 are provided side by side above and below at locations on both ends of each position conversion pull-out bolt 31. These position conversion pull-out bolts 31 and position conversion press bolts 32 are provided in opposing directions.

[0028] The position conversion drawing bolts 31 are rotatably attached to the block position reference portion 26, with their tips projecting further toward the die block 25 than the block position reference portion 26 and screwed into the die block 25. By rotating the position conversion drawing bolts 31 in one direction (for example, to the left), the die block 25 can be moved in the opposite direction away from the movable flat die 4. Each position conversion drawing bolt 31 can be rotated individually, and by rotating each of them, the positions near both ends of the die block 25 (fixed flat die 3) in the rolling direction can be changed in the opposite direction away from the movable flat die 4.

[0029] The position changing press bolt 32 is rotatably attached to the block position reference portion 26, and its tip protrudes toward the die block 25 beyond the block position reference portion 26 and abuts against the die block 25. By rotating this position changing press bolt 32 in one direction (for example, to the right), the die block 25 can be pressed and moved in the opposite direction toward the movable flat die 4. Each position changing press bolt 32 can be rotated individually, and by rotating each of them, the positions near both ends of the die block 25 (fixed flat die 3) in the rolling direction can be changed in the opposite direction toward the movable flat die 4.

[0030] The mechanism for adjusting the position of the die block 25 (fixed flat die 3) in the opposing direction by appropriately rotating these two position change drawing bolts 31 and four position change pressing bolts 32 can be a commonly used mechanism, so details thereof will be omitted.

[0031] Furthermore, the block position reference section 26 is provided with opposing position detection sensors 33, 33 at locations near both ends in the rolling direction to detect the opposing positions (hereinafter referred to as opposing direction positions) of the die block 25 (fixed flat die 3) (see FIG. 6). These opposing position detection sensors 33, 33 detect the respective locations near both ends in the rolling direction of the fixed flat die 3. This makes it possible to detect the respective opposing positions of the respective locations near both ends of the fixed flat die 3.

[0032] In this embodiment, the fixed flat die 3 is slidable in the rolling direction relative to the block position reference portion 26 when the fastening bolts 10, 10 are loosened. The block position reference portion 26 is provided with an adjustment bolt (not shown) that changes the position of the fixed flat die 3 in the rolling direction, and by rotating the adjustment bolt, the fixed flat die 3 can be slid in the rolling direction. The block position reference portion 26 is provided with a rolling position detection sensor 34 that detects the position of the fixed flat die 3 in the rolling direction (hereinafter referred to as the rolling direction position) (see FIG. 6).

[0033] In this way, with the fastening bolts 10, 10 loosened, the fixed flat die 3 of this embodiment can be changed in position in the opposing direction by rotating the position change drawing bolt 31 and the position change pressing bolt 32, and can also be changed in position in the rolling direction by rotating the adjustment bolt. Then, by tightening the fastening bolts 10, 10, the fixed flat die 3 can be positioned and fixed.

[0034] 6, the rolling device 1 of this embodiment is provided with a position detection device 35 having the opposing position detection sensors 33, 33 and the rolling position detection sensor 34. The position detection device 35 is provided with a control PC 36 and a touch panel 37, and signals detected by the opposing position detection sensors 33, 33 and the rolling position detection sensor 34 are input to the control PC 36. The control PC is provided with a central control unit and a storage device, and controls the display of the touch panel 37.

[0035] The position detection device 35 further includes a top dead center detection sensor 39 for detecting the position of the top dead center of the movable flat die 4, and a signal detected by the top dead center detection sensor 39 is input to the control PC 36. The top dead center detection sensor 39 is provided on the base table 2 to detect the top dead center (start position of rolling) of the movable flat die 4 at which rolling starts.

[0036] Product specification information (information such as nominal diameter and pitch) of the thread to be rolled and various programs for calculating the conditions for rolling based on this specification information are stored in advance in the storage device of the control PC 36. Specific programs stored in the storage device include a program for calculating the amount of reciprocating movement of the movable flat die 4, a program for calculating a correction amount for correcting the position of the top dead center of the movable flat die 4, and a program for calculating corrected position information for the opposing direction position of the fixed flat die 3.

[0037] The program for calculating the reciprocating movement amount of the movable flat die 4 calculates the reciprocating movement amount based on the outer diameter data of the product standard information. The program for calculating the correction movement amount of the top dead center calculates the correction movement amount based on the nominal diameter and pitch information of the product standard information and input information input by the operator. The input information is information input via the touch panel 37 as described below, and indicates the thread direction, information regarding the height of the movable flat die 4, and the positional deviation amount P, etc., and is data actually measured using a test piece 61 as described below. This program calculates the correction movement amount using the nominal diameter and pitch of the product standard information, the positional deviation amount P input by the operator as described below, the information regarding the height of the movable flat die 4 also input, and pi. By operating the correction bolt 8 according to the calculated correction movement amount, the movable flat die 4 can be adjusted to the appropriate top dead center.

[0038] The program for calculating the corrected position information for the facing direction position of the fixed flat die 3 calculates the corrected position information based on the nominal diameter and pitch information from the product standard information, data actually measured using the test piece 61, etc. Specifically, as will be described later, the program calculates corrected position information corresponding to each of the detected positions of the detection sensors 33, 33 using the biting depth T input by the operator, the nominal diameter and pitch from the product standard information, and information on the facing direction positions detected by the facing position detection sensors 33, 33, etc. By operating the position conversion drawing bolt 31 and the position conversion pressing bolt 32 in accordance with the corrected position information for each detected position, the fixed flat die 3 can be adjusted to a position where machining can be performed with an appropriate biting depth.

[0039] The touch panel 37, under the display control of the control PC, switches between displaying the correction amount of the top dead center of the movable flat die 4 shown in Fig. 7 and displaying the correction position information of the facing direction position of the fixed flat die 3 shown in Fig. 8. Such display switching can be performed by an operator. Note that, as conventionally known means can be applied to the processing and operation of this switching, details will be omitted.

[0040] To display the correction amount of the top dead center of the movable flat die 4, as shown in FIG. 7, the touch panel 37 displays a standard display section 41 that selectively displays thread standards (such as nominal diameter, pitch, and thread direction), a height display section 74 that displays input information about the height of the movable flat die 4, a positional deviation display section 75 that displays the input positional deviation amount P, and a bar-shaped correction graphic section 81. This touch panel 37 is the same as a commonly used touch panel and can be operated by an operator by touching a predetermined portion. Specifically, by operating the standard display section 41, the operator can select and display one of multiple pre-set product standard information. The correction graphic section 81 displays a vertical line-shaped target position display section 82 at the center in the longitudinal direction, and a vertical line-shaped current position display section 83 corresponding to the correction amount. The display position of the current position display section 83 is spaced apart from the target position display section 82 to indicate the correction amount, and as the correction amount decreases, it approaches the target position display section 82. When the correction movement amount is 0, the current position display section 83 is displayed aligned with the target position display section 82. The touch panel 37 also displays a rotation direction instruction display section 78 that indicates the rotation direction of the correction bolt 8, and a target value arrival display section 79 that indicates that the current position display section 83 has aligned with the target position display section 82.

[0041] On the other hand, when displaying corrected position information for the opposing direction position of the fixed flat die 3, as shown in Figure 8, the screen of the touch panel 37 displays the above-mentioned standard display section 41, a penetration amount display section 44 that displays the input penetration depth T, first to third current value display sections 43a to 43c that display the current position information of the fixed flat die 3 detected by the opposing position detection sensors 33, 33 and the rolling position detection sensor 34, and first to third corrected position information display sections 42a to 42c that display the corrected position information of the fixed flat die 3 corresponding to the detected positions of each of these detection sensors 33, 34, respectively.

[0042] Next, a correction method will be described in which the position of the top dead center of the movable flat die 4 and the position of the fixed flat die 3 in the opposing direction are adjusted to match the product standard (nominal diameter of the thread) before rolling. The correction method is performed using a test piece 61 obtained by rolling a base material 60.

[0043] First, the test piece 61 is created. The creation of the test piece 61 is executed by instructing the creation of the test piece 61 via the touch panel 37 (not shown). In this embodiment, the drive control device disposed on the base table 2 executes control operations for creating the test piece in accordance with the operation of the touch panel 37. This drive control device corresponds to the test movement control means according to the present invention.

[0044] More specifically, the product specifications (nominal diameter, pitch, and thread direction) of the screw product to be manufactured are selectively input via the touch panel 37, and the process of creating the test piece 61 is initiated.

[0045] As shown in Fig. 4(a), the test piece 61 is formed by clamping the base material 60 between the fixed-side rolling surface 11 of the fixed flat die 3 and the moving-side rolling surface 21 of the moving flat die 4 at the top dead center, and then, as shown in Fig. 4(b), the moving flat die 4 is advanced in the forward rolling direction until the base material 60 rotates half a turn. As a result, groove-shaped fixed-side streaks 62 based on the fixed-side rolling surface 11 and moving-side streaks 63 based on the moving-side rolling surface 21 are formed in the base material 60 (see Fig. 5).

[0046] With regard to advancing the moving flat die 4 until the base material 60 has made a half rotation, since the nominal diameter, thread pitch, etc. of the screw product to be manufactured are input in advance, the program of the position detection device 35 calculates the amount of movement of the moving flat die 4 based on the outer periphery length of the machined portion of the test piece 61. Then, the drive control device executes control to automatically move the moving flat die 4 forward from the top dead center by this amount of movement.

[0047] After the base material 60 has made the half rotation, the movable flat die 4 is automatically returned to the top dead center (returning operation). By controlling the automatic reciprocating movement of the movable flat die 4 in this manner using the drive control device, a fixed-side score 62 and a movable-side score 63 are formed on the base material 60, and a test piece 61 having these scores 62, 63 is obtained.

[0048] As shown in FIG. 5 , this test piece 61 has fixed-side striations 62 and moving-side striations 63 formed thereon. One of the grooves formed as the fixed-side striations 62 is selected, and a groove centerline is defined as the centerline formed along the longitudinal direction of the selected groove in a front view of the test piece 61. Then, a positional deviation P of a moving-side groove centerline V defined in the corresponding moving-side striation 63 relative to an imaginary groove centerline W formed by extending the selected groove centerline is measured. This positional deviation P is measured as the amount of positional deviation of the moving-side groove centerline V from the appropriate position in the direction along the axis of the test piece 61, with the proper position being defined as when the moving-side groove centerline V is located at the imaginary groove centerline W. For example, the moving-side groove centerline V is measured to be 0.29 mm lower than the imaginary groove centerline W (lower than the head of the test piece 61).

[0049] The positional deviation amount P measured in this way is input using the touch panel 37. As shown in Fig. 7(A), a screen for inputting the positional deviation amount P is displayed on the touch panel 37, and the operator inputs the positional deviation amount (specifically, 0.29 mm) into the positional deviation amount display unit 75 and also inputs the position of the movable flat die 4 (specifically, whether the movable flat die 4 is lower or higher) into the height display unit 74.

[0050] When the positional deviation amount P and the like are input to the touch panel 37, the position detection device 35 automatically calculates the amount of correction movement for adjusting the top dead center of the movable flat die 4, as described above, using the nominal diameter, thread pitch, and thread direction of the product standard information, the input information on the height of the movable flat die 4, and the positional deviation amount P. Then, a correction graphic section 81 displaying the current position display section 83 at a position indicating this calculated amount of correction movement is displayed on the touch panel 37. Furthermore, a rotation direction instruction display section 78 is also displayed.

[0051] The worker operates the correction bolt 8 while looking at the correction graphic portion 81 and the rotation direction indication display portion 78, and by making the current position display portion 83 overlap the target position display portion 82, the worker can adjust the top dead center of the movable flat die 4 to the appropriate position where the moving side groove center line V and the imaginary groove center line W are aligned in a straight line. In this way, the worker can operate the correction bolt 8 while more visually recognizing the positional deviation and amount of the movable flat die 4.

[0052] When the current position display section 83 and the target position display section 82 overlap, the target value attainment display section 79 is displayed in place of the rotation direction instruction display section 78 as shown in Figure 7 (B), and it is announced that the correction of the position of the movable flat die 4 has been completed. With this configuration, even an unskilled person can easily correct the position of the die of the rolling device 1.

[0053] Meanwhile, either the fixed-side groove 62 or the moving-side groove 63 formed on the test piece 61 is selected, and the depth of the selected groove is measured. Here, the groove depth is measured as the penetration depth T into the outer surface of the test piece 61 before the formation of the fixed-side groove 62, etc., as shown in FIG. 5(B). For example, the penetration depth T is measured to be 0.011 mm. Here, by adjusting the penetration depth T, the rolling pressure can be adjusted and the pitch can be matched. That is, by performing the pitch adjustment, a product can be formed that matches the pitch of the product specifications. Furthermore, by adjusting the rolling pressure, slippage during the rolling process can be suppressed. By performing the pitch adjustment and the rolling pressure adjustment in this manner, the occurrence of forming defects due to the rolling process can be suppressed.

[0054] The bite depth T measured in this way is input using the touch panel 37. As shown in Fig. 8, a screen for inputting the bite depth T is displayed on the touch panel 37, and the operator inputs the bite depth T (specifically, 0.011 mm) into the bite amount display unit 44.

[0055] When the biting depth T is input to the touch panel 37, the position detection device 35, as described above, automatically calculates corrected position information corresponding to each of the detection sensors 33, 33, for adjusting the position of the fixed flat die 3 in the facing direction, using the nominal diameter and pitch of the product specification information, information on the current position of the fixed flat die 3 detected by the facing position detection sensors 33, 33, and the input biting depth T. Then, this corrected position information is displayed on each of the corrected position information display sections 42a to 42c of the touch panel 37, and current position information of the fixed flat die 3 is displayed on each of the current value display sections 43a to 43c.

[0056] The worker loosens the fastening bolts 10, 10 that secure the fixed flat die 3, allowing the fixed flat die 3 to slide in the facing direction and the rolling direction, and then operates the position conversion drawing bolt 31, the position conversion pressing bolt 32, and the adjustment bolt while comparing the corrected position information displays 42a-42c with the current value displays 43a-43c. By doing so, the worker can match the information in the current value displays 43a-43c with the corrected position information displayed in the corrected position information displays 42a-42c, respectively, thereby adjusting the facing direction position of the fixed flat die 3 to an appropriate position that allows for forming with the desired penetration depth (desired rolling pressure and pitch consistent with product specifications) during rolling. In this way, the worker can visually recognize the facing direction position of the fixed flat die 3 and the corrected position information and operate the position conversion drawing bolt 31, the position conversion pressing bolt 32, and the adjustment bolt.

[0057] The test piece 61 is rotated half a turn when adjusting the top dead center position and the facing direction position of the fixed flat die 3. This is primarily to prevent the fixed-side crease 62 and the moving-side crease 63 from overlapping. Secondly, this is to facilitate measurement of the misalignment between the imaginary groove centerline W, which is an extension of the groove centerline of the fixed-side crease 62, and the moving-side groove centerline V of the moving-side crease 63. Therefore, as long as the misalignment P between the imaginary groove centerline W and the moving-side groove centerline V can be properly measured, the amount of rotation of the base material 60 may be less than half a turn. If the amount of rotation of the base material 60 exceeds half a turn, the fixed-side crease 62 and the moving-side crease 63 may overlap, potentially making it difficult to properly recognize the centerlines W and V. Furthermore, if the fixed-side crease 62 and the moving-side crease 63 overlap, it may be difficult to properly measure the penetration depth T.

[0058] As described above, the rolling device 1 of this embodiment calculates the correction movement amount for adjusting the top dead center of the movable flat die 4 and the correction position information for adjusting the position of the fixed flat die 3 using the positional deviation amount P and the bite depth T measured between the fixed-side streaks 62 and the movable-side streaks 63 formed on the test piece 61, and displays these on the touch panel 37. While viewing the touch panel 37, an operator can adjust the top dead center of the movable flat die 4 by operating the correction bolt 8, and can adjust the opposing position of the fixed flat die 3 by operating the position conversion drawing bolt 31 and the position conversion pressing bolt 32. Since the position adjustment can be performed visually in this way, the position adjustment can be performed easily and stably. This allows the operator to accurately and easily adjust the positions of the movable flat die 4 and the fixed flat die 3 to the processing start positions appropriate for the male thread to be rolled, without relying on experience or intuition. Furthermore, this embodiment has a function of assisting the worker in adjusting the positions of the movable flat die 4 and the fixed flat die 3, and therefore, skill training can be conducted through the actual work of adjusting the positions, which allows the worker's skills to be improved efficiently and is also useful for skill transfer.

[0059] Furthermore, the configuration of this embodiment reduces quality variations due to differences in the level of expertise among workers, which reduces the burden of quality control for screws and improves the life of dies. Furthermore, shortening the preparation time reduces the workload on workers and improves the operating rate of the rolling device. Another advantage is that the cost required for the blank before actual processing can be reduced.

[0060] In the configuration of the present embodiment described above, the correction bolt 8 corresponds to the top dead center position adjusting means of the present invention. The control PC 36 and touch panel 37 correspond to the position deviation amount input means and the penetration input means of the present invention, and the touch panel 37 corresponds to the display unit of the present invention. The position detection device 35 corresponds to the correction movement amount calculation control means and the adjustment value output means of the present invention. The position conversion drawing bolt 31 and the position conversion pressing bolt 32 correspond to the opposing position adjusting means of the present invention. The opposing position detection sensors 33, 33 correspond to the opposing position detecting means of the present invention, and the first and second current position information correspond to the detected opposing position information of the present invention. The correction graphic portion 81 corresponds to the movement amount corresponding graphic portion of the present invention.

[0061] In the above-described embodiment, the dimensions and shapes of each part can be freely selected as appropriate. For example, a configuration may be adopted in which the rotation of the correction bolt is automatically controlled in accordance with the correction movement amount. Furthermore, the means for position adjustment is not limited to a correction bolt, and other configurations such as a turnbuckle may of course be adopted. Furthermore, a configuration may be adopted in which the amount of positional deviation of the moving groove center line from the imaginary groove center line can be automatically measured from information captured by a camera installed in the rolling device. Similarly, the bite depth of the test piece can also be automatically measured from information captured by the camera.

[0062] In the rolling device of the embodiment, the fixed flat die is movable in the opposing direction so that its position in the opposing direction can be adjusted, but this is not limiting, and the movable flat die may be movable in the opposing direction so that the cutting depth can be adjusted by adjusting the position of the movable flat die in the opposing direction. Alternatively, both the fixed flat die and the movable flat die may be movable in the opposing direction so that their respective positions in the opposing direction can be adjusted.

[0063] The rolling device of the embodiment is configured with a top dead center detection sensor that detects the top dead center position of the moving flat die, but this is not limited to this, and various means for measuring the position of the moving flat die can be applied. For example, a means for measuring the distance (movement amount) moved by the moving flat die can be provided, and the position of the moving flat die can be obtained based on this movement amount. In this configuration, the moving flat die can be adjusted to the desired top dead center by using the above-mentioned correction movement amount and the movement amount of the moving flat die.

[0064] In the rolling device of the embodiment, the position conversion drawing bolt and the position conversion press bolt are respectively provided near both ends of the fixed flat die, but this is not a limitation, and the arrangement positions and number of these position conversion drawing bolts and position conversion press bolts can be changed as appropriate. For example, one position conversion drawing bolt and one position conversion press bolt can be provided approximately at the center of the fixed flat die in the rolling direction, and the opposing position of the fixed flat die can be adjusted by rotating them. Alternatively, three or four position conversion drawing bolts and three or four position conversion press bolts can be provided.

[0065] The rolling device of the embodiment is configured so that the opposing positions of the fixed flat dies can be changed by rotating the position change drawing bolt and the position change pressing bolt, but this is not limited to this, and it is also possible to configure so that the positions of the fixed flat dies in the opposing direction are changed by a single position change bolt. The number and positions of such position change bolts can be determined appropriately.

[0066] The above-described embodiment illustrates a rolling device for rolling male threads, but it can also be applied to devices for rolling products other than male threads. For example, it can be applied to a rolling device for knurling or form rolling (grooving, etc.), and can improve work efficiency and stabilize quality in the same way as the above-described embodiment.

[0067] REFERENCE SIGNS LIST 1 rolling device 2 base stand 3 fixed flat die 4 movable flat die 8 correction bolt 11 fixed side rolling surface section 21 movable side rolling surface section 31 position change drawing bolt 32 position change pressing bolt 33 opposing position detection sensor 35 position detection device 36 control PC 37 touch panel 60 base material 61 test piece 62 fixed side streak 63 movable side streak V movable side groove center line W imaginary groove center line P position deviation amount T penetration depth

Claims

1. A rolling device comprising: a fixed flat die fixed on a base table and having a fixed-side rolling surface; and a movable flat die arranged so as to be freely movable back and forth along the rolling direction on the base table and having a movable-side rolling surface that faces the fixed-side rolling surface during rolling; a top dead center position adjustment means for manually adjusting the position of the top dead center of the movable flat die along the rolling direction; and a test movement control means having a control content for automatically controlling the forward movement of the movable flat die, which moves the movable flat die a predetermined amount along the rolling direction from the top dead center position to rotate the base material half a turn, and the return movement of the movable flat die, which returns the movable flat die to the top dead center position, thereby obtaining a test piece in which a groove-like fixed-side crease based on the fixed-side rolling surface and a groove-like movable-side crease based on the movable-side rolling surface are formed on the base material. the device comprises: a positional deviation input means for receiving an input of a positional deviation of the moving side striation from the appropriate position in a direction along the axis of the test piece, where the appropriate position of the moving side striation is defined as a state in which the groove center line of the moving side striation is located on a virtual groove center line formed by extending the groove center line of the fixed side striation when the test piece is viewed from the front; a correction movement amount calculation control means having a control content for calculating a distance to the appropriate top dead center position of the moving flat die as a correction movement amount of the moving flat die based on the input positional deviation amount; further, at least one of the fixed flat die and the moving flat die is arranged so that its position can be changed along the opposing direction in which the fixed side rolling surface portion and the moving side rolling surface portion face each other; an opposing position adjustment means for manually adjusting the relative positions of the fixed flat die and the moving flat die in the opposing direction; and an opposing position detection means for detecting the relative positions of the fixed flat die and the moving flat die in the opposing direction. a bite input / output means for receiving an input of the bite depth of the test piece in the radial direction of the fixed-side streaks and the moving-side streaks of the test piece obtained by the test movement control means; an adjustment value output means for outputting the corrected movement amount calculated by the corrected movement amount calculation control means, opposing position information based on the relative position in the opposing direction detected by the opposing position detection means, and the bite depth input received by the bite depth input means;A rolling device comprising:

2. The rolling device according to claim 1, wherein the adjustment value output means comprises: a control content for displaying the penetration depth input by the penetration depth input means on a specified display unit; and a control content for sequentially displaying the opposing position information on the display unit in accordance with adjustment of the relative position in the opposing direction by the opposing position adjustment means.

3. A rolling device as described in claim 1 or claim 2, wherein the adjustment value output means displays a movement amount corresponding graphic portion on a predetermined display portion, and the correction movement amount calculation control means generates the movement amount corresponding graphic portion according to the movement amount along directions perpendicular to the rolling direction of the moving flat die and the opposing directions of the fixed side rolling surface portion and the moving side rolling surface portion, and outputs the generated movement amount corresponding graphic portion to the adjustment value output means.

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