JP5921422B2 - Horizontal type mechanical tube expansion device - Google Patents

Description

  The present invention relates to a mechanical tube expansion device, and more particularly to a horizontal type mechanical tube expansion device in which split dies are installed sideways.

  A rotary electric motor, a scroll compressor, a slide vane compressor, and the like have a cylindrical casing made of a steel pipe. In order to satisfy the product specifications (heat dissipation characteristics, efficiency, noise, etc.) of the final product, it is necessary to ensure the roundness of the inner diameter of the cylindrical housing to a certain degree of accuracy. The roundness of the inner diameter can be secured by cutting the inner periphery of the cylindrical molded product. However, for steel pipes, a die (die) is pressed from the inside to increase the manufacturing cost. Therefore, a method for improving the roundness of the inner diameter than before spreading is in circulation. The manufacturing method using this mandrel is called pipe expansion or diameter expansion. The mechanical pipe expander is a device that realizes pipe expansion (diameter expansion) with a mechanical structure, and ensures a desired inner diameter roundness without machining.

  For the production of cylindrical casings by tube expansion, a roll bending device that bends steel sheets, a shrink press device that stabilizes the shape after bending, and a mechanical tube expander that ensures the roundness of the inner diameter in the final shape are set. Used in The mechanical pipe expander includes a plurality of divided dies divided in the circumferential direction, a cone (bar-shaped member) having a tapered shape for moving the divided dies in the radial direction, and a linear motion drive unit that linearly moves the cone. It consists of. The outer surface of the split die is polished with a desired diameter. The inner surface of the split die has the same taper angle as the cone taper shape. In many cases, the outer diameter of the split die is made several hundred microns larger than the final inner diameter of the cylindrical molded product.

  The driving force of the linear motion drive unit is transmitted to the cone. The radial movement of the split die is realized along a guide rail installed in the main body of the pipe expander. The split die has a larger pipe expansion force due to the wedge effect of the tapered shape of the cone and the split die. If the position of the linear motion drive unit where the outer surface of the split die becomes the outer diameter during polishing is known, the outer diameter of the split die can be calculated from the taper angle and the amount of movement of the linear motion drive unit. That is, a desired outer diameter of the split die can be realized by controlling the amount of movement of the linear drive unit. Actually, since there is a spring back of the cylindrical molded product, the inner diameter of the cylindrical molded product after tube expansion is smaller than the set outer diameter of the split die. Usually, in anticipation of the springback, the tube is expanded by that much.

  When the expansion of the tube is finished, the cone having the tapered shape is pulled back by the linear motion drive unit. Unlike the tube expansion, since the force for moving the split die from the cone in the inner diameter direction does not work, the split die is provided with a plurality of ring-shaped elastic bodies, for example, urethane rubber rings in the axial direction. This elastic body is stretched against elasticity during tube expansion, and stores elastic energy. As a result, the split die is moved in the inner diameter direction after the expansion of the tube. Since the alternating load repeatedly acts on the elastic body, the elastic body becomes a consumable part that needs to be replaced at a certain frequency.

  On the other hand, a pipe expansion device using a link mechanism has been proposed as a pipe expansion system (for example, Patent Document 1). With this structure, tube expansion and contraction operations can be reliably realized by hydraulic cylinder operation. In addition, in a tube expanding device using a cone having a general tapered shape, a tube expanding device using a metal coil spring instead of urethane rubber is proposed as a ring-shaped elastic body (for example, Patent Document 2). In this way, changing the tube expansion method to the link method or changing the elastic material from urethane rubber to metal eliminates maintenance parts and attempts to realize reliable tube contraction operation after tube expansion operation. It is made.

JP 63-6287 (page 3, lower left 7 to lower right 5 lines, FIG. 4) JP 2006-75870 A (pages 5-6, FIG. 4)

  In the horizontal type mechanical pipe expansion device, since the axial direction is substantially horizontal, the split die receives a self-weight load that works vertically downward. Except for the split die installed above, the split die performs a return operation against the self-load during the contraction operation after the completion of the pipe expansion, so that a reliable return operation is required for the split die. In the prior art document 1, a link mechanism is used to convert a pushing operation and a pulling operation of a hydraulic cylinder, which is a drive source, into a radially expanding operation and a contracting operation. Since the operation of the hydraulic cylinder is directly in the radial direction, the tube contraction operation can be reliably realized after the pipe expansion, and there is no consumable to be maintained.

  When the cylindrical casing to be expanded is made of metal and has a large plate thickness, the mandrel requires a large expansion force. The link mechanism has a lower force transmission efficiency than the tapered cone system. The link mechanism is required to ensure a larger driving source and sufficient strength. In order to ensure the pipe expansion accuracy, it is necessary to perform the pipe expansion operation of the divided segments with high accuracy. A plurality of pivot points are essential for the link mechanism. In the rotating part, it is necessary to keep the clearance small and to secure a large allowable load, and a bearing having a large basic load rating is indispensable. Since many components and each component require high processing accuracy and assembly accuracy, the pipe expansion device becomes expensive.

  In the prior art document 2, a tapered cone system is adopted. The number of components required for accuracy is small, and the tube expansion device is inexpensive. At the time of the contraction operation after the expansion, a reliable contraction operation is possible by the elasticity of the coil spring installed on the outer periphery. Unlike general urethane rubber, coil springs can be designed to last longer, so there are no consumables to be maintained. If the elasticity of the coil spring is too large, the force against the tube expansion increases, and a larger tube expansion force is required, and the energy efficiency is lowered. On the other hand, if the elasticity of the coil spring is too small, the contraction operation cannot be realized reliably, and the tube expansion device cannot be established. That is, there is a certain optimal range for the elasticity of the coil spring.

  In small-quantity mass production, product production has been carried out by installing dedicated pipe expansion machines for each model with different inner diameters. However, under the recent demand for high-mix low-volume production or variable-variable-variable production, one tube expansion machine is required to have the ability to expand pipes with easy setup change for many models with different inner diameters. ing. By preparing split dies with different diameters and changing the split dies to be installed according to the pipe expansion target, it can handle high-mix low-volume production or variety-variable-variable production. At this time, the weight of the split die increases or decreases depending on the diameter, and in order to optimize the coil spring, it is necessary to replace the coil spring for each model. This replacement is a loss when the model is changed.

  In order to eliminate the exchange, it is possible to install a coil spring suitable for the split die with the largest diameter and use it with a split die with a small diameter. It becomes a pipe expander with low energy efficiency. The present invention has been made to solve such a problem, and an object of the present invention is to obtain a tube expansion device excellent in expandability applicable to a plurality of models.

A horizontal installation type mechanical pipe expansion device according to the present invention includes a mandrel in which a plurality of divided dies are engaged and a work insertion direction is directed to the side, and a front receiving part and a rear receiving part that are arranged with a work spaced apart from each other. The workpiece mounting table is supported below the mandrel, and a linear motion mechanism in which the mounting portion moves in the horizontal direction and a load sensor that detects the presence or absence of the workpiece are provided. The work table includes an interval adjusting mechanism that horizontally moves the front receiving portion or the rear receiving portion, an elevating mechanism that is fixed to a mounting portion of the linear motion mechanism, and a height of the elevating portion is changed. And an elastic member that is sandwiched between them and expands and contracts in the vertical direction.

  According to the present invention, since the work table and the lifting mechanism are elastically connected, it is not necessary to avoid the receiving portion during the pipe expanding operation. After the pipe expansion, the split die installed below is pushed up through the cylindrical casing, so that the return operation of the mandrel after the pipe expansion can be realized with certainty. In addition, it is possible to cope with a plurality of types having different inner diameters and axial dimensions of the cylindrical housing, and it is not necessary to replace the ring-shaped elastic body for each model.

It is a side view which shows the horizontal installation type mechanical pipe expansion apparatus by embodiment of this invention. It is a figure showing the relationship between a division | segmentation die | dye and a mandrel. It is side surface sectional drawing with respect to the main components of the mandrel at the time of standby. It is side surface sectional drawing with respect to the main components of a mandrel at the time of pipe expansion. It is a side view of the workpiece mounting base in embodiment of this invention. It is a front view of the workpiece mounting base in embodiment of this invention. It is a figure which shows the mounting procedure and tube expansion procedure of a cylindrical housing | casing.

  DESCRIPTION OF EMBODIMENTS Embodiments of a horizontal type mechanical pipe expansion device according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably.

  In FIG. 1, the side surface general view of the horizontal installation type mechanical pipe expansion apparatus 1 in embodiment of this invention is shown. The horizontal type mechanical tube expansion device 1 includes a work table 2 on which a cylindrical housing 31 that is a workpiece (processing object) is placed, a mandrel 3 that expands the inner diameter of the cylindrical housing 31 from the inside, A hydraulic cylinder 14 or the like that is coupled to the mandrel 3 and performs a linear motion in the horizontal direction is provided. The mandrel 3 in which a plurality of divided dies 4 are engaged in the lateral direction is disposed with the cylindrical axis directed substantially in the horizontal axis direction. The mandrel 3 changes in outer diameter, and performs a tube expansion operation and a tube contraction operation. The work table 2 is installed below the mandrel 3 and moved horizontally in the direction of the cylindrical axis of the mandrel 3 by the linear motion mechanism 60. The displacement sensor 28 detects the position of the linear motion mechanism 60 or the work table 2. The receiving part 6 of the work table 2 is composed of a front receiving part 6a and a rear receiving part 6b that are arranged at an interval, and is moved in a substantially vertical axis direction by an elevating mechanism (see FIG. 5).

  The mandrel 3 has a workpiece insertion direction facing sideways. The division die 4 of the mandrel 3 serves as a contact surface with the cylindrical housing 31. In the machine room 5, a hydraulic cylinder 14, a coupling 15, a hydraulic cylinder control device 7 (a hydraulic pump, a solenoid valve, a hydraulic tank, a position detection device, an air cooling fan, a heater, and the like) are installed. The position detection device of the hydraulic cylinder control device 7 detects the state of the hydraulic cylinder 14. Since the stop position of the hydraulic cylinder 14 is greatly affected by the oil temperature, the oil temperature of the hydraulic cylinder 14 is adjusted to an appropriate range using an air cooling fan, a heater, or the like included in the hydraulic cylinder control device 7. For workpieces having different widths, the distance between the front receiving portion 6a and the rear receiving portion 6b is adjusted. The in-stock sensor 27 is installed in the rear receiving part 6b (or the front receiving part 6a), and detects whether or not a work is installed on the work table 2.

  The mandrel 3 includes a plurality of split dies 4 installed on the outermost periphery, a rod-shaped cone 12, a jaw 13 fitted to the cone 12, and the like. FIG. 2A shows a state where the split die is engaged with the jaw, and FIG. 2B shows a state where the split die is separated from the jaw. Here, the division number of the division die 4 is eight. The jaw 13 is also divided into eight as with the divided die 4. The cone 12 has an octagonal prism shape. Each split die 4 is formed with a T-shaped groove 4a on the inner peripheral side. Similarly, a T-shaped guide 8 is fixed to each jaw 13. Since the T-shaped guide 8 of the jaw 13 and the T-shaped groove 4a of the split die 4 are fitted with high accuracy, the position and posture of the split die 4 are set with high accuracy. Although the case where the T-shaped guide 8 is uniformly installed in the axial direction is shown here, the T-shaped guide 8 may be partially installed at a plurality of locations. Moreover, although the case where the division | segmentation die | dye is 8 division is shown, it cannot be overemphasized that the division | segmentation number other than that may be sufficient.

  Next, the detailed structure of the main components related to the mandrel 3 and the tube expansion operation will be described with reference to FIGS. FIG. 3 shows a side cross-sectional view of the main components during standby. FIG. 4 shows a side cross-sectional view of main components at the time of pipe expansion. The rod-shaped cone 12 has a tapered shape for moving the dividing die 4 in the radial direction. The inner surface of the jaw 13 has the same taper angle as the tapered shape of the cone 12. The operation of the jaw 13 is restricted by a radial guide (not shown). A T-shaped guide 8 (see FIG. 2) and a plurality of elastic rings 16 are installed on the outer periphery of the jaw 13. The T-shaped guide 8 of the jaw 13 and the T-shaped groove 4a of the split die 4 are fitted with high accuracy, and the position and posture of the split die 4 are set with high accuracy. The return mechanism 17 is provided with a plurality of tension springs 17a.

  The cone 12 is connected to a hydraulic cylinder 14 installed in the machine room 5 via a coupling 15. When performing the pipe expansion operation, the hydraulic cylinder 14 moves in the right direction in the figure, and the cone 12 moves in the right direction in the figure through the coupling 15. Due to the linear movement of the cone 12, the jaw 13 moves in the outer radial direction along a radial guide (not shown) against the elastic force of the elastic ring 16. The split die 4 connected to the jaw 13 also moves in the outer diameter direction at the same time, so that the tube expansion operation is realized. The difference in outer diameter between the waiting time of the jaw 13 (FIG. 3) and the pipe expansion time (FIG. 4) is the amount of expansion of the elastic ring 16.

  After the end of the pipe expanding operation, the hydraulic cylinder 14 moves leftward in the figure, so that the cone 12 also moves leftward via the coupling 15. With only the return movement of the cone 12, the jaw 13 does not move to the inner diameter side by its own weight, except for the one installed above. The movement of the jaw 13 toward the inner diameter side is realized by the return force of the elastic ring 16 and the return mechanism 17. The return mechanism 17 generates a tensile force between the cone 12 and the jaw 13 by a plurality of tension springs 17a. A plurality of types of cylindrical housings having different inner diameters can be handled by preparing split dies 4 having different outer diameters.

  Next, the detailed structure of the work table 2 will be described. FIG. 5 shows a side view of the work table 2 in the embodiment of the present invention, and FIG. 6 shows a front view of the work table 2. The work table 2 is attached to an attachment portion 60 a of the linear motion mechanism 60. The attachment portion 60a is configured to slide in the axial direction of the mandrel 3 and to be slidable. The front receiving portion 6a and the rear receiving portion 6b each have a contact portion at an end portion, and directly support the cylindrical housing 31. A front receiving portion 6a, a rear receiving portion 6b, a horizontal movement mechanism 24a, an operation portion 24b, and the like are fixed to the receiving portion fixing plate 24c. A compression spring 26 is sandwiched between the receiving portion fixing plate 24c and the elevating portion 21h. A vertical guide 21g passes through the compression spring 26. One end of the vertical guide 21g is fixed to the ball screw mounting base 21d, penetrates the elevating part 21h, and the other end protrudes from the receiving part fixing plate 24c. An operation handle 21a, a pulley 21b, a timing belt 21c, a ball screw 21e, and the like are attached to the ball screw mounting base 21d. The nut 21f is fixed to the elevating part 21h. The compression spring 26 is restricted from moving in the horizontal direction by the vertical guide 21g and expands and contracts in the vertical direction.

  The lifting mechanism 21 of the work table 2 is fixed to the mounting portion 60 a of the linear motion mechanism 60. The elevating part 21 h performs an elevating operation by the elevating mechanism 21. Here, as the elevating mechanism 21, an elevating operation is realized using an operation handle 21a, a pulley 21b, a timing belt 21c, a ball screw mounting base 21d, a ball screw 21e, a nut 21f, a vertical guide 21g, an elevating part 21h, and the like. ing. By rotating the operation handle 21a, the ball screw 21e is rotated via the pulley 21b and the timing belt 21c, and the height of the elevating part 21h connected to the nut 21f is changed. When the elevating part 21h moves up and down, the receiving part fixing plate 24c connected to the up and down direction guide 21g and the compression spring 26 also elastically moves up and down. Thereafter, the height of the elevating part 21h is fixed by a lock mechanism (not shown). Thereby, it is possible to cope with models having different inner diameters only by changing the height of the receiving portion 6 due to the inner diameter dimensions. Since the receiving part 6 is connected to the elevating mechanism 21 via the compression spring 26, when the cylindrical housing 31 is installed in the receiving part 6, it moves downward by the weight of the cylindrical housing.

  When the operation part 24b is rotated, the front receiving part 6a moves horizontally with respect to the axial direction of the mandrel 3 by the operation of the horizontal movement mechanism 24a. Here, as the interval adjusting mechanism 24, the horizontal adjusting mechanism 24a, the operation portion 24b, the receiving portion fixing plate 24c and the like are used to realize the interval adjusting operation. Thereafter, the axial position of the mandrel 3 is fixed to the front receiving portion 6a by a lock mechanism (not shown). As a result, it is possible to cope with a change in the axial dimension of the cylindrical casing 31 and flexibly cope with a change in the axial dimension of the cylindrical casing 31. An in-stock sensor 27 for detecting the cylindrical housing 31 is embedded in the rear receiving portion 6b, so that not only the presence / absence of the cylindrical housing 31 but also the installation state can be grasped. Here, the in-stock sensor 27 is installed in the rear receiving part 6b from the viewpoint of wiring routing, but even if it is installed in the front receiving part 6a or both the front receiving part 6a and the rear receiving part 6b, It goes without saying that it is good. As described above, since the work table 2 has an axial direction adjustment function using the interval adjustment mechanism 24 and a radial direction adjustment function using the lifting mechanism 21, a plurality of types of cylindrical housings having different widths and inner diameters. Can be installed in the horizontal installation type mechanical tube expansion device 1 and can be expanded easily by exchanging the divided die 4.

  Next, the placement procedure and the tube expansion procedure of the cylindrical housing 31 will be described based on FIGS. 7A to 7F. In each figure which shows a procedure, the side view of the horizontal installation type mechanical tube expansion apparatus 1 and the front view from the arrow direction described in the side view are shown. The crossed broken line in the front view indicates the central axis of the cylindrical casing 31, and by comparing the height of this horizontal axis with the central horizontal axis of the mandrel 3, the relative position with respect to the vertical direction can be known. The workpiece mounting table 2 reciprocates between a mounting position where the workpiece is mounted and a tube expansion position where the workpiece is attached to the mandrel. First, in order to set the work table 2 to the mounting position, the work table 2 is moved forward along the linear motion mechanism 60 with respect to the axial direction of the mandrel 3. The displacement sensor 28 detects whether or not the work table 2 is held at a predetermined set position. The position of the front receiving portion 6a and the overall height of the receiving portion 6 are set according to the inner diameter and the axial length of the cylindrical casing 31 that performs the pipe expansion. The height in the vertical direction is set by the elevating mechanism 21 so that the cylindrical casing 31 is slightly above the center of the mandrel 3. This can be seen from the fact that the horizontal axis of the broken line in FIG. 7C comes above the center of the mandrel 3. The workpiece mounting table 2 is fixed at a workpiece mounting position by a fixing jig 9a (FIG. 7A).

Next, the cylindrical casing 31 is placed on the workpiece placing table 2 by a crane, an electric chain block, or the like at the workpiece placing position (FIG. 7B). After confirming that the cylindrical housing 31 is installed by the load sensor 27 embedded in the rear receiving portion 6b, the work table 2 is moved to the back side with respect to the axial direction of the mandrel 3 to the tube expansion position. At this time, it is detected by the displacement sensor 28 installed in the horizontal type mechanical pipe expansion device 1 whether or not the work table 2 is installed at a predetermined pipe expansion position. The work table 2 is fixed by a fixing jig 9b at a tube expansion position where tube expansion is performed (FIG. 7C). Thus, the installation of the cylindrical casing 31 is completed. Thereby, loading, unloading, and tube expansion of the cylindrical housing 31 can be reliably performed.

  During the pipe expanding operation, the outer diameter of the mandrel 3 is increased and the cylindrical casing 31 is also expanded in diameter, but the receiving part 6 is lowered downward against the compression spring 26 that supports the receiving part 6, so that the work table 2 Need not be avoided during tube expansion (FIG. 7D). Next, after the expansion of the tube, the split die 4 installed below is pushed up by the elastic energy stored in the compression spring 26 through the cylindrical housing 31 in the inner diameter direction. It can be realized reliably (FIG. 7E). Thereby, the load to the elastic ring 16 is reduced and the replacement frequency can be reduced. For the divided dies 4 having different inner diameters, the elevation position of the work table 2 is set to an appropriate height for each inner diameter. There is no need to change the compression spring 26, and it can be applied to a plurality of types of cylindrical housings 31. Thereafter, the work table 2 is set to the front mounting position with respect to the axial direction of the mandrel 3, and the cylindrical housing 31 is unloaded by a crane, an electric chain block, or the like (FIG. 7F).

  Here, the pulley 21b and the timing belt 21c are used for transmission of the rotational force of the operation handle 21a, but it goes without saying that this is not limited to the known technique. In addition, the structure of the ball screw 21e and the nut 21f has been described as the lifting mechanism 21 installed on the work table 2. However, a similar effect can be obtained by a known lifting mechanism technology such as an X-link lifting mechanism. It goes without saying that it is done.

  Although the lifting / lowering operation and the linear movement operation of the work table 2 and the movement operation of the front receiving portion 6a have been described manually here, it goes without saying that the same effect can be obtained even if it is operated automatically by an electric motor or the like. There is also no. Further, although four compression springs 26 are used, the effect of the present invention is not limited to the number as long as the structure can perform a smooth lifting operation. It goes without saying that the same effect can be obtained even if the guide function is separately provided.

  Further, in the present embodiment, the fixed position of the work table 2 is detected by the displacement sensor 28. However, even if a load sensor is installed in the fixed jigs 9a and 9b and the fixed position is detected, the same effect can be obtained. It goes without saying that you can get it. In addition, when loading or unloading the work after the pipe expansion or after the pipe expansion with a crane or an electric chain block to the position of the fixed jig 9a manually, it is not necessary to detect the exact position. It goes without saying that the detection by the presence sensor may be only the position of the fixed jig 9b.

  As described above, since the receiving portion 6 of the work table 2 is elastically connected to the lifting mechanism 21 and the work table 2 can be installed at an appropriate height according to the inner diameter, the outer diameter of the cylindrical housing at the time of the tube expansion operation The increase can be absorbed and the receiving part 6 does not need to be avoided from the lower part of the mandrel. Since the pressing force is applied to the split die 4 upward through the cylindrical housing after the pipe expansion, the mandrel return operation after the pipe expansion can be reliably realized without depending on the model. Since the presence sensor 27 detects whether the pipe expansion target part is installed at a predetermined position, the axial position accuracy of the split die 4 and the cylindrical housing 31 can be ensured, and the operator forgets to install or installation mistakes, etc. Can prevent poca.

  After the pipe expansion is completed, the lower split die is pushed up through the cylindrical housing, so that the mandrel contraction operation after the pipe expansion is completed can be reliably realized. The linear motion mechanism can smoothly load and unload the cylindrical casing that is the target of tube expansion, and the working time can be shortened. Furthermore, a plurality of types of cylindrical housings having different axial dimensions can be reliably installed by the receiving portion of the receiving portion and the axial adjustment mechanism. The radial direction adjustment mechanism enables reliable installation even for a plurality of types of cylindrical housings having different inner diameters, and enables highly accurate tube expansion. Since the work table 2 can be installed at an appropriate height according to the inner diameter, a reliable return operation can be realized without depending on models with different inner diameters, and it is an apparatus suitable for high-mix low-volume production or variable-variable-variable production. At the same time, it becomes easy to handle new models.

  In the present invention, the embodiments can be appropriately modified or omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 Horizontal installation type mechanical pipe expansion apparatus, 2 Work place stand, 3 Mandrel, 4 Split die, 4a T-shaped groove, 5 Machine room, 6 Receiving part, 6a Front receiving part, 6b Rear receiving part, 7 Hydraulic cylinder control apparatus, 8 T-shaped guide, 9a fixed jig, 9b fixed jig, 12 cone, 13 jaw, 14 hydraulic cylinder, 15 coupling, 16 elastic ring, 17 return mechanism, 17a tension spring, 21 lifting mechanism, 21a operation handle, 21b pulley, 21c Timing belt, 21d Ball screw mounting base, 21e Ball screw, 21f Nut, 21g Vertical guide, 21h Elevating part, 24 Spacing adjustment mechanism, 24a Horizontal movement mechanism, 24b Operation part, 24c Receiving part fixing plate, 26 Compression spring, 27 Stock sensor, 28 Displacement sensor, 31 Cylindrical housing, 60 straight Moving mechanism, 60a mounting part

Claims (4)

A mandrel in which a plurality of split dies are engaged, and the insertion direction of the workpiece faces sideways;
A workpiece mounting base that supports the workpiece with a front receiving portion and a rear receiving portion arranged at intervals, a linear movement mechanism that is installed below the mandrel and the mounting portion moves in a horizontal direction ;
A stock sensor for detecting the presence or absence of the workpiece ,
The work table is
An interval adjusting mechanism for horizontally moving the front receiving portion or the rear receiving portion;
An elevating mechanism fixed to the attachment part of the linear motion mechanism, and the height of the elevating part changes;
A horizontal-type mechanical tube expansion device having an elastic member that is sandwiched between the interval adjustment mechanism and the elevating unit and expands and contracts in the vertical direction. A mandrel in which a plurality of split dies are engaged, and the insertion direction of the workpiece faces sideways;
A workpiece mounting base that supports the workpiece with a front receiving portion and a rear receiving portion arranged at intervals, a linear movement mechanism that is installed below the mandrel and the mounting portion moves in a horizontal direction ;
A displacement sensor for detecting the position of the work table ,
The work table is
An interval adjusting mechanism for horizontally moving the front receiving portion or the rear receiving portion;
An elevating mechanism fixed to the attachment part of the linear motion mechanism, and the height of the elevating part changes;
A horizontal-type mechanical tube expansion device having an elastic member that is sandwiched between the interval adjustment mechanism and the elevating unit and expands and contracts in the vertical direction. The horizontal placement type mechanical tube expansion device according to claim 2 , further comprising a load sensor that detects presence or absence of the workpiece. The load presence sensor is horizontal type mechanical expanding apparatus according to claim 1 or 3, characterized in that mounted on the front receiving portion or the rear receiving portion.

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