JP4880356B2 - Cutting device for use in the production line of heat exchanger tubes - Google Patents

Description

  The present invention relates to a cutting apparatus used in a production line for producing a heat exchanger tube by roll-forming a continuously fed metal plate material.

  For example, heat exchanger tubes (hereinafter abbreviated as tubes), which are components of heat exchangers such as automobile radiators, heater cores, intercoolers, condensers, etc., have a great number of demands. There is still a need for improvement. The heat exchanger tube production line, for example, rolls metal plates that are continuously fed to create continuous tube members, and cuts the tube members into product units to produce tubes. Here, as one of the factors that influence the production capacity of the tube, there is a capability of a cutting device that cuts the tube member after roll forming into product units.

  For example, the cutting device found in Patent Document 1 includes a guide that holds a pipe member that is continuously fed out, and a cutting blade that cuts the pipe member held by the guide while rotating. Although the guide is not illustrated in the illustration of Patent Document 1, the guide is necessary because the tube member or the tube is deformed by cutting the cutting blade unless the tube member is temporarily held with respect to the rotating cutting blade. It is. This cutting device has a maximum number of cuttings of 600 times / minute, although it depends on the specific device configuration, the material of the pipe member to be cut, the cross-sectional shape or size, and the like. In addition, since the cutting blade can be rotated using a driving source such as a transfer roller that feeds the plate member or the pipe member, there is an advantage that the feeding and cutting of the tube can be easily synchronized.

JP2003-062632 (paragraph [0044], FIG. 4)

  A tube member obtained by roll-forming a metal plate has a flat cross-sectional shape with semicircular arcs on both side edges. On the other hand, the cutting blade of the cutting apparatus has a pair of semicircular arc-shaped blades that are concave with respect to the side edge of the tube member, and forms a central protrusion where the semicircular arc blades intersect. The purpose of this cutting blade is to make the pressure of the blade against the pipe member equal in the vertical direction and to generate chips symmetrically in the vertical direction by the vertically symmetrical blade. From this, it is ideal if the circular orbit of the central projecting portion hits the center of the side edge of the tube member along the width direction axis of the tube member and becomes a straight track that advances straight along the width direction axis as it is. Cutting with a blade is realized, and the pipe member can be cut cleanly. Here, the “width direction axis” means an axis extending in the width direction of the pipe member connecting both edges of the semicircular arc shape in cross section.

  However, since the central protrusion of the cutting blade of the cutting apparatus shown in Patent Document 1 circulates in an arcuate path, the central protrusion of the cutting blade cannot be advanced along the widthwise axis of the tube member. For this reason, when the width of the tube is increased, the deviation between the axis in the width direction of the tube and the arc trajectory of the central projecting portion is increased. Therefore, in order to reduce the deviation, it is necessary to increase the rotation radius of the cutting blade. This has led to an increase in the size of the entire apparatus and a result of requiring a drive source (such as an electric motor) having a large output by enlarging the rotary arm that supports the cutting blade with respect to the rotary shaft.

  In addition, no matter how large the radius of rotation of the cutting blade is, the arc trajectory of the central protruding portion is not revised, so if the central protruding portion of the cutting blade hits the center of the side edge of the pipe member, If the central projecting part deviates from the width direction axis of the pipe member, and conversely, if the central projecting part runs along the width direction axis of the pipe member in the middle of the pipe member, the central projecting part projects into the center of the side edge of the pipe member. I can't guess. That is, since the cutting blade is abutted from obliquely below the side edge having a semicircular cross section, stress applied to the tube member or the tube is applied during the cutting, and the tube member or the tube may be deformed. From this point, the cutting device found in Patent Document 1 has an upper limit of 600 cuttings / minute.

  In addition, the cutting device found in Patent Document 1 uses a guide provided with an opening through which the tube member is inserted, but the opening is formed slightly larger than the cross-sectional shape of the tube member in order to insert the tube member. Therefore, burrs were generated on the end face of the tube cut by cutting with a cutting blade. Although this burr is extremely small, it becomes a hindrance when the tube is tightly inserted into the insertion hole of the plate that is the support member of the heat exchanger, so the work to remove the burr from the end face of the tube made Needed. This has caused a reduction in production capacity as seen from the entire heat exchanger production line.

  However, as already mentioned, there is still a demand for higher tube production capacity. Therefore, based on a cutting device that uses a rotating cutting blade, first of all, to improve the production capacity of the tube, that is, to make the number of cuttings per unit time higher than 600 times / min. Cutting in the tube production line for the purpose of reducing the size of the drive source and reducing the deformation of the tube member and tube during cutting and realizing the formation of a clean end face with reduced burr. We decided to add some consideration to the equipment.

What was developed as a result of the study was used in the production line for heat exchanger tubes, from a guide that holds the tube member that is continuously sent out, and a cutting blade that cuts the tube member held by the guide while rotating The cutting blade has a pair of semi-arc-shaped blades that are concave and symmetrical with respect to the side edge of the tube member, and forms a central protrusion where the semi-arc-shaped blades intersect. a cam that rotates in synchronization with the provided said cam displaces the tubular member the guide pressing the guide holds the radial direction of the cutting blade, the width axis of the central projecting portion a tube member of said cutting blade It is the cutting device moved along.

  The cutting device of the present invention does not displace the cutting blade rotating at high speed in the radial direction of rotation of the cutting blade, but instead guides the guide in the radial direction of rotation of the cutting blade by a cam that rotates in synchronization with the rotation of the cutting blade. Displace. Since the tube member is held by the guide, it is displaced together with the guide in the rotational radius direction of the cutting blade, and the width direction axis of the tube member is also displaced in the rotational radius direction of the cutting blade. Thereby, the center protrusion part of the cutting blade according to the circular arc trajectory can travel along the width direction axis of the tube member displaced in the rotational radius direction of the cutting blade, thereby suppressing the deformation of the tube member or the tube during the cutting. Can be prevented.

The guide used in the present invention may have a configuration similar to the conventional one provided with an opening. However, as described above, since a slight gap is formed between the tube member and the opening, there is a possibility that the displacement of the tube member does not coincide with the displacement of the guide, and the generation of burrs due to the gap cannot be suppressed. . Therefore, the guide used in the cutting apparatus of the present invention, a clamp inner located rotate radially inwardly of the cutting blade, constructed from an outer clamp located in the rotation radial direction outer side of the cutting blade, it is in the clamp pushed cam radial direction of the rotational radius displacement to the pipe member in a direction outwardly the inner clamp and outer clamp by Rukoto pressed against the outer clamps clamp the tubular member, pressed such have the clamp cutting blade cam of the cutting blade It is preferable that the tube member be released from the inner clamp and the outer clamp by allowing the tube member to be displaced inward and away from the outer clamp. At least the inner clamp, in order to reliably return to the initial position cam in such have state pressed within the clamp, it is preferable to urge the rotating radially inwardly of the cutting blade.

Guide consisting of an inner clamp and outer clamp state have such depressed inner clamp cam, i.e. away the inner clamp and outer clamp in a state in which the inner clamping displaced in radial direction inwardly of the cutting blade, the each pipe member On the other hand, a gap is formed. However, in the state in which cam the inner clamp and press, with the inner clamp displaced in radial direction outwardly of the cutting blade, the inner clamp presses the pipe member to the outer clamp pushes up the tubular member, said clamp The tube member is clamped by the outer clamp. As a result, the pipe member reliably matches the displacement of the inner clamp, and the inner clamp and the outer clamp are both in close contact with the pipe member in a state where the inner clamp is displaced outward in the rotational radial direction of the cutting blade. The pipe member can be cut without generating any.

  The guide may fix the position of the outer clamp, for example, and the inner clamp may press the tube member against the outer clamp. Further, the inner clamp and the outer clamp may be parallel to the tangent line of the arcuate track of the central protrusion, and the inner clamp may be translated in the rotational radius direction of the cutting blade. However, if the position of the outer clamp is fixed, the tube member may be crushed by the amount of displacement of the inner clamp, or a gap may be formed to cause burrs. Further, when the inner clamp is translated in the rotational radius direction of the cutting blade, there is a possibility that the inner clamp that repeats the parallel movement in synchronization with the rotation of the rotating blade loses parallelism with respect to the tangent line of the arcuate track of the central protrusion.

Therefore, a swingable inner clamp that is located on the inside of the cutting blade in the rotational radius direction and is biased inwardly in the rotational radius of the cutting blade , and located on the outer side of the cutting blade in the rotational radius direction, and the rotational radius of the cutting blade consist of a swingable outer clamps is biased inwardly, said by Rukoto pressing the rotation to the tubular member in the radial direction outward pushed the clamp cutting blade cam outer clamp clamp and outer clamp clamping the tubular member, within said by to be able Keru away rotation to tubular member in radial direction inward pressed such have the clamp cutting blade cam from outside the clamp The guide may be configured to release the tube member from the clamp and the outer clamp. Inner clamp and outer clamp, in order to reliably return to their respective initial positions cam the inner clamp in pressing such have state, it is preferable to urge the rotating radially inwardly of the cutting blade.

Inner clamp and outer clamp for swingably biased toward the radial direction inward of the cutting blade, the cam is pressed to the clamp, of course, since the inner clamp to the outer clamp also swung to press the tubular member There is no possibility of crushing the tube member, and both the inner clamp and the outer clamp can be brought into close contact with the tube member. In addition, the inner clamp and the outer clamp swing in the rotational radius direction of the cutting blade with one end being fixed by the swing shaft, so that there is a risk of losing parallelism with respect to the tangent line of the arc orbit of the central protrusion. There is no. The swing shafts of the inner clamp and the outer clamp may be provided separately. However, since it is desirable that the inner clamp and the outer clamp be parallel to sandwich the tube member, both swing shafts are made common and the swing shaft is rocked in the same manner. It is good to move.

  Here, since the tube member is pressed against the outer clamp by the swinging inner clamp, strictly speaking, the tube member is twisted within a range in which the inner clamp swings. However, the inner clamp swings within the range of deviation between the axis of the tube member in the width direction and the arc trajectory of the central protrusion, and the amount of twisting of the very long tube member over the production line is very small. It is. Further, if the swing radius of the inner clamp and the outer clamp is sufficiently increased, the swing angle of the inner clamp can be reduced, and the swing of the inner clamp is not different from the parallel movement of the cutting blade in the rotational radius direction. From this, the problem that the tube member is twisted does not substantially occur, and the axis in the width direction of the tube member sandwiched between the swinging inner clamp and the outer clamp can be displaced according to the arc trajectory of the central protrusion. .

  The cutting device of the present invention can increase the number of cuts per unit time and increase the production capacity of the tube production line as compared with the conventional cutting device of the same type. In addition, since the deviation between the axis in the width direction of the tube member held by the guide and the circular arc track of the central protrusion of the cutting blade can be absorbed by the displacement of the guide in the rotational radius direction of the cutting blade, Compared to the above, the radius of rotation of the cutting blade can be reduced, and the entire apparatus and the drive source can be reduced in size. In addition, unlike the conventional cutting device of the same type, by forming the guide with an inner clamp and an outer clamp, it is not necessary to form a gap between the pipe member and the guide, and the generation of burrs can be suppressed. As described above, the present invention brings about an effect of improving the production capacity, reducing the size of the entire apparatus and driving source, and improving the quality of the obtained tube.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 7 are front views of the cutting device of this example as viewed from the upstream side (right side in FIG. 7) of the pipe member in the feed direction, and FIG. 1 shows a stage in which the guide 1 passes the pipe member. 2 is a stage where the guide 1 clamps the pipe member, FIG. 3 is a stage where the cutting blade 2 starts cutting the pipe member, FIG. 4 is a stage where the cutting blade 2 cuts the pipe member halfway, and FIG. FIG. 6 shows the stage in which the pipe member has been cut, and FIG. 6 shows the stage in which the guide 1 releases the pipe member. 7 is a side view of the cutting device at the stage corresponding to FIG. 1, FIG. 8 is an enlarged view of the portion indicated by the arrow A in FIG. 1, and FIG. 9 is a portion showing the relationship between the cutting blade 2 and the pipe member at the stage corresponding to FIG. FIG. 10 is a partially enlarged view showing the relationship between the cutting blade 2 and the pipe member at the stage corresponding to FIG. 4, and FIG. 11 is a part showing the relation between the cutting blade 2 and the pipe member at the stage corresponding to FIG. It is an enlarged view. For convenience of illustration, the illustration of the pipe member and the tube is omitted in each figure, but the flat cross-sectional shape formed by the inner concave portion 111 and the outer concave portion 121 of the inner clamp 11 and the outer clamp 12 is the same as that of the pipe member and the tube. Matches the cross-sectional shape.

  As shown in FIGS. 1 and 7, the cutting device of the present example includes a guide 1 that holds a pipe member that is continuously fed out, and a cutting blade 2 that cuts the pipe member held by the guide 1 while rotating. It consists of. The cutting blade 2 has a pair of semicircular arc-shaped blades 21 and 21 that are concave with respect to the side edge of the pipe member, and has a structure in which a central projecting portion where the semicircular arc-shaped blades 21 and 21 intersect is formed. The semicircular blades 21 and 21 and the central projecting portion are directed to the downstream side in the rotational direction (leftward in FIG. 1), and are mounted to project from the mounting portion 231 of the rotating disk 23 in the radial direction. Here, in the cutting device of the present invention, the pipe held by the guide 1 with a deviation (see FIGS. 9 to 11) between the width direction axis L of the pipe member and the arc trajectory R of the central projecting portion 22 of the cutting blade 2. Since the member absorbs by displacing the cutting blade 2 in the rotational radius direction, the rotational radius of the cutting blade 2 can be reduced, and the turntable 23 can be downsized. This brings about the effect of downsizing of the entire apparatus and downsizing of the driving source. The turntable 23 of this example is provided with a balancer 232 in a point-symmetrical positional relationship with the mounting portion 231, and the rotation axis 233 and moment axis when the turntable 23 with the cutting blade 2 attached to the mounting portion 231 rotates. We are trying to match. The cam 3 is attached to the rotary shaft 233 and rotates in synchronization with the cutting blade 2.

  The guide 1 includes an inner clamp 11 that is located on the inner side of the cutting blade 2 in the rotational radius direction and is swingable, and an outer clamp 12 that is located on the outer side of the cutting blade 2 in the rotational radius direction and is swingable. As shown in FIG. 7, a pair of guides 1 constituted by the inner clamp 11 and the outer clamp 12 are provided on the upstream side and the downstream side in the feeding direction of the pipe member with the cutting blade 2 interposed therebetween. The inner clamp 11 is separated from the outer clamp 12 until it is pushed up by the cam 3, and the pipe member passes through the inner clamp 11 and the inner recess 111 and the outer recess 121 of the outer clamp 12 as they are. However, as will be described later, when the inner clamp 11 is pushed outward in the rotational radial direction of the cutting blade 2, the tube member fitted in the inner recess 111 of the inner clamp 11 is pushed outward in the rotational radial direction of the cutting blade 2. Then, it fits into the outer recess 121 of the outer clamp 12, and the inner clamp 11 and the inner recess 111 and the outer recess 121 of the outer clamp 12 hold the tube member.

  The inner clamp 11 is a U-shaped member that is opened outward in the rotational radial direction of the cutting blade 2, halves the cross-sectional shape of the tube member (= tube) along the width direction axis L, and upwards An inner recess 111 that is open to the center is provided in the intermediate portion of the member. The inner clamp 11 is provided with a swing shaft 113 at the inner support end 112 on the upstream side in the rotational direction of the cutting blade 2 (right side in FIG. 1), and the inner clamp 11 is located on the downstream side in the rotational direction of the cutting blade 2 (left side in FIG. 1). An inner clamp spring 115 is interposed between the swing end portion 114 and the apparatus main body 4 arranged on the outer side in the rotational radius direction of the cutting blade 2, and the cam 3 attached to the inner swing end portion 114 and the rotary shaft 233. A copying roller 116 that rolls on the cam peripheral surface 31 is provided. As a result, the inner clamp 11 is biased inward in the rotational radius direction of the cutting blade 2 by the inner clamp spring 115, and the rotational radius of the cutting blade 2 according to the copying roller 116 pressed against the cam peripheral surface 31 of the cam 3. Displace in the direction.

  The outer clamp 12 is a member having a rectangular shape when viewed from the front spanned over the inner clamp 11, and divides the cross-sectional shape of the tube member (= tube) along the width direction axis L of the tube member and opens downward. An outer recess 121 is provided at an intermediate portion of the member. The outer clamp 12 has an outer support end 122 on the upstream side in the rotation direction of the cutting blade 2 (right side in FIG. 1) attached to the swing shaft 113 of the inner clamp 11. Thereby, the swing of the inner clamp 11 and the outer clamp 12 becomes equal. Further, the outer clamp 12 is for outer clamping between the outer swing end portion 124 on the downstream side in the rotation direction of the cutting blade 2 (left side in FIG. 1) and the apparatus main body 4 arranged on the outer side in the rotation radial direction of the cutting blade 2. A spring 125 is interposed. A stopper 41 that engages the outer swing end 124 from the inner side in the rotational radius direction of the cutting blade 2 is provided in the apparatus main body 4. As a result, the outer clamp 12 is separated from the inner clamp 11 by engaging the outer swing end 124 with the stopper 41 while being urged inward in the rotational radial direction of the cutting blade 2 by the outer clamp spring 125. When the inner clamp 11 displaced in the direction of the radius of rotation of the blade 2 pushes up the tube member, it is displaced in the direction of the radius of rotation of the cutting blade 2.

  As shown in FIG. 8, the cam 3 has a cutting blade 2 on a part of the cam peripheral surface 31 along which the copying roller 116 provided on the inner clamp 11 extends and on the downstream side in the rotation direction of the cutting blade 2 (left side in FIG. 1). A push-up surface 32 in which unevenness is continuously and smoothly connected from the upstream side to the downstream side in the rotation direction is formed (in contrast to the virtual line representing the cam peripheral surface 31 in FIG. 8). For convenience of explanation, a thick underline is drawn in FIGS. In the cam 3 that rotates in synchronization with the cutting blade 2, the cam peripheral surface 31 other than the push-up surface 32 does not push up the copying roller 116. Therefore, the inner clamp 11 is pushed by the inner clamp spring 115 and rotates inward in the rotational radial direction of the cutting blade 2, the inner clamp 11 is moved away from the outer clamp 12, and the pipe member is separated from the inner clamp 11 and the outer clamp 12. Is released (steps of FIGS. 1, 6 and 7). However, when the push-up surface 32 reaches the copying roller 116, the inner clamp 11 is pushed up by the push-up surface 32 and rotates outward in the radial direction of the cutting blade 2, and the inner clamp 11 presses the tube member against the outer clamp 12. Then, the pipe member is clamped by the inner clamp 11 and the outer clamp 12 (each stage in FIGS. 2 to 5).

  The push-up surface 32 of the cam 3 displaces the inner clamp 11 outward in the rotational radial direction of the cutting blade 2, presses the tube member against the outer clamp 12 by the inner clamp 11, and holds the tube member by the inner clamp 11 and the outer clamp 12 At the same time, the tube member sandwiched between the inner clamp 11 and the outer clamp 12 is displaced outward and inward in the rotational radial direction, and the central projecting portion 22 of the cutting blade 2 is moved along the width direction axis L of the tube member. Here, if only the tube member is clamped by the inner clamp 11 and the outer clamp 12, it is sufficient that the inner clamp 11 can be displaced outward in the rotational radial direction. However, the difference between the arc trajectory R drawn by the central projecting portion 22 of the cutting blade 2 and the width direction axis L of the pipe member is greatest at the stage where the cutting blade 2 starts cutting the pipe member and the stage where the cutting is finished. For example, the width direction axis L is the smallest at the tangent of the arcuate track R or at the middle in the width direction of the pipe member close to the tangent. From now on, the inner clamp 11 and the outer clamp 12 sandwiching the tube member are connected to the cutting blade 2 in accordance with the difference between the arcuate track R drawn by the central protrusion 22 of the cutting blade 2 and the width direction axis L of the tube member. It is necessary to displace both outward and inward in the radial direction of the rotation. For this reason, the push-up surface 32 of the cam 3 is repeatedly uneven.

The specific unevenness of the push-up surface 32 of the cam 3 is, for example, the positional relationship between the inner clamp 11 and the outer clamp 12 when the inner clamp 11 and the outer clamp 12 release the pipe member, and the displacement mode of the inner clamp 11 and the outer clamp 12. The positional relationship of the oscillating shaft 113, the oscillating radius of the inner clamp 11 and the outer clamp 12, the positional relationship between the inner clamp 11 and the outer clamp 12 and the arc orbit R of the central protrusion 22 of the cutting blade 2, and cutting. In addition to the width and thickness of the pipe member, it is determined by the correlation of the feed speed of the pipe member, the rotational speed of the cutting blade 2, and the like. Depending on the positional relationship of the inner clamp 11 and the outer clamp 12 when the inner clamp 11 and the outer clamp 12 release the pipe member, the outer clamp 12 is pulled inwardly in the rotational radial direction of the cutting blade 2 by the cam 3 to move the pipe member. sandwiched by the inner clamp 11 and an outer clamp 12, also Ru can be displaced.

  As shown in FIG. 8, the push-up surface 32 of this example is arranged in order from the upstream side in the rotational direction of the cutting blade 2 in the order of low convex surface, high convex surface, and low convex surface, and the width direction axis L of the tube member is at the intermediate position. The tube member sandwiched between the inner clamp 11 and the outer clamp 12 is displaced in the radial direction of the cutting blade 2 so as to coincide with the circular arc track R of the central protrusion 22 of the cutting blade 2. This push-up surface 32 pushes up the inner clamp 11 and clamps the tube member by the inner clamp 11 and the outer clamp 12 within a range of a low convex surface upstream of the cutting blade 2 in the rotation direction. Further, the push-up surface 32 is a range of a high convex surface and a low convex surface downstream of the cutting blade 2 in the rotation direction, so that the central protruding portion 22 of the rotating cutting blade 2 coincides with the width direction axis L of the tube member. The member is pushed up and rotated upward in the rotational radial direction of the cutting blade 2, and the tube member is pushed down by the repulsion of the inner clamp spring 115 and the outer clamp spring 125, and again lowered downward in the rotational radial direction.

  The cutting of the pipe member by the cutting apparatus of this example will be described. In this example, the displacement in the rotational radial direction of the cutting blade 2 of the pipe member is defined as vertical movement, and the vertical position of the rotating cutting blade 2 is defined as a sine change. Match in the middle. First, at the stage where the push-up surface 32 does not reach the copying roller 116 provided on the inner clamp 11, the outer clamp 12 is lowered in a range where it is hooked by the stopper 41 as shown in FIG. The copying roller 116 is lowered in a range where the copying roller 116 rolls along the cam peripheral surface 31 and is separated from the outer clamp 12. For this reason, the pipe member is fed out without contacting any of the inner recess 111 and the outer recess 121. When the rotation of the cutting blade 2 advances and a low convex surface on the upstream side of the cutting blade 2 in the rotation direction of the cutting blade 2 reaches the copying roller 116, the low convex surface becomes the scanning roller 116 as seen in FIG. The inner clamp 11 is pushed up through the inner clamp 11, the inner clamp 11 presses the tube member against the outer clamp 12 from below, and the inner clamp 11 and the outer clamp 12 clamp the tube member. The inner clamp 11 and the outer clamp 12 are sandwiched between the inner recess 111 and the outer recess 121 in close contact with the outer surface of the tube member, so that there is no gap between the tube member and the inner recess 111 and the outer recess 121, and cutting is performed. It is possible to suppress the occurrence of burrs on the tube member and the end face of the tube.

When the cutting blade 2 further rotates and reaches the stage where the central projection 22 of the cutting blade 2 reaches the side edge of the pipe member, as shown in FIGS. 3 and 9, the center of the push-up surface 32 of the cam 3 is increased. The upward convex slope of the convex surface starts to push up the inner clamp 11 via the copying roller 116 and the outer clamp 12 via the tube member sandwiched between the inner clamp 11 and the outer clamp 12. Then, the width direction axis L of the tube member is displaced outward in the rotational radius direction of the cutting blade 2, and the C ₁ point of the side edge where the central protrusion 22 of the cutting blade 2 and the width direction axis L coincide, that is, the side The central protrusion 22 hits the middle of the edge, and the cutting of the pipe member is started. Here, the posture of the cutting blade 2 that strikes the middle of the side edge of the pipe member is inclined, but the pair of upper and lower semicircular arc blades 21 and 21 centering on the central protrusion 22 are independent of the posture of the cutting blade 2. Therefore, the posture of the cutting blade 2 is not a problem.

Since the vertical position of the cutting blade 2 changes in a sine, when the rotation of the cutting blade 2 proceeds from the stage where the central protruding portion 22 abutted against the side edge of the pipe member is abutted, the central protruding portion 22 rises. Go. 4 and 10, the rising slope up to the top of the central high convex surface of the push-up surface 32 of the cam 3 is moved to the inner clamp via the copying roller 116 as the central protrusion 22 rises. 11 and the outer clamp 12 through the tube member sandwiched by the inner clamp 11 and the outer clamp 12 are continuously pushed up in accordance with the sine change of the central protrusion 22 of the cutting blade 2. That is, the width direction axis L of the tube member is displaced outward in the rotational radial direction of the cutting blade 2 in accordance with the rise of the central protrusion 22 of the cutting blade 2. Thus, although the central projecting portion 22 of the cutting blade 2 draws an arc orbit R according to the cutting blade 2, the cutting blade 2 moves vertically along the width direction axis L from the point C _{1 in} relation to the pipe member, and the cutting blade 2 is vertical. When the apex of the position is reached, it can coincide with the middle point C ₂ of the width direction axis L.

The cutting blade 2 that has reached the apex of the vertical position starts to lower the vertical position this time, and the central protrusion 22 also descends. From now on, as seen in FIGS. 5 and 11, the downward slope from the top of the central high convex surface of the push-up surface 32 of the cam 3 is the inner clamp spring 115 and the outer clamp as the central protrusion 22 descends. The inner clamp 11 and the outer clamp 12 are allowed to be pushed down by the spring 125, and the tube member is displaced inward in the rotational radial direction of the cutting blade 2. Thus, the central protruding portion 22 of the cutting blade 2, although an arc trajectory R in accordance with the cutting blade 2, in relation to the tubular member has reached the side edge advances along the width axis L from the C ₂ points when, C ₃ points of the side edges of the central projecting portion 22 of the cutting blade 2 and the width axis L coincides, i.e. will protrude from the middle of the side edge, cutting of the pipe member is completed.

  If the inner clamp 11 and the outer clamp 12 release the tube member after cutting the tube member by the cutting blade 2, one cutting operation is completed. In this example, the inner clamp 11 and the outer clamp 12 do not release the pipe member immediately after cutting the pipe member, but the rotation direction of the cutting blade 2 on the push-up surface 32 of the cam 3 as shown in FIG. The lower convex surface on the downstream side pushes up the inner clamp 11 via the copying roller 116, and the outer clamp 12 slightly through the tube member sandwiched between the inner clamp 11 and the outer clamp 12, and each inner clamp spring 115 and outer clamp After slightly compressing the spring 125, the inner clamp 11 is pushed out from the outer clamp 12 by using the inner clamp 11 and the outer clamp 12 pushed down by the inner clamp spring 115 and the outer clamp spring 125. As a result, the tube member that has been cut is reliably released from the inner clamp 11 and the outer clamp 12.

  The same kind of cutting apparatus using the rotating cutting blade 2 as in the present invention has a maximum number of cuttings of 600 times / minute in order to avoid deformation of the tube member or the tube. Moreover, since the guide 1 that only inserts the pipe member was used, the generation of burrs could not be suppressed. However, as is apparent from the above description, the cutting device of the present invention has the central protrusion 22 of the cutting blade 2 that advances along the width direction axis L of the tube member, and the inner clamp 11 and the outer clamp 12 are connected to the tube member. Since the deformation of the pipe member is suppressed or prevented and the occurrence of burrs can be suppressed or prevented, the number of cuttings can be increased more than 600 times / minute (the specific number of cuttings is , Depending on the overall configuration of the device and the ability of the drive source). In this way, the cutting device of the present invention can increase the number of cuts per unit time and increase the production capacity of the tube manufacturing line as compared with a conventional cutting device of the same type.

It is the front view which looked at the cutting device of this example in the stage which a guide has let a pipe member pass from the feed direction upstream of a pipe member. It is the front view which looked at the cutting device of this example in the stage which the guide pinched the pipe member from the sending direction upstream of the pipe member. It is the front view which looked at the cutting device of this example in the stage which the cutting blade started cutting a pipe member from the sending direction upstream of a pipe member. It is the front view which looked at the cutting device of this example in the stage which the cutting blade cut | disconnected the pipe member to the middle from the sending direction upstream of the pipe member. It is the front view which looked at the cutting device of this example in the stage which the cutting blade has finished cut | disconnecting a pipe member from the feed direction upstream of the pipe member. It is the front view which looked at the cutting device of this example in the stage which the guide released the pipe member from the sending direction upstream of the pipe member. It is a side view of the cutting device in the stage equivalent to FIG. It is an A arrow view part enlarged view in FIG. FIG. 4 is a partially enlarged view showing a relationship between a cutting blade and a pipe member at a stage corresponding to FIG. 3. It is the elements on larger scale showing the relationship between the cutting blade and pipe member in the stage equivalent to FIG. FIG. 6 is a partially enlarged view showing a relationship between a cutting blade and a pipe member in a stage corresponding to FIG. 5.

Explanation of symbols

1 Guide
11 Inner clamp
12 External clamp 2 Cutting blade
21 Semi-circular blade
22 Center protrusion
23 Turntable 3 Cam
31 Cam circumference
32 Push-up surface 4 Device body
41 Stopper L Pipe member width direction axis R Arc trajectory of central protrusion

Claims (3)

A heat exchanger tube manufacturing line, which is composed of a guide for holding a continuously fed pipe member and a cutting blade for cutting the pipe member held by the guide while rotating, the cutting blade being the tube. In a cutting apparatus that has a pair of semi-circular blades that are concave and symmetrical with respect to the side edge of the member, and that forms a central protrusion where the semi-circular blades intersect,
A cam that rotates in synchronization with the rotation of the cutting blade is provided, said cam displaces the tubular member the guide Pressing the guide holds the radial direction of the cutting blade, the tube member a central protrusion of the cutting blade The cutting apparatus used for the manufacturing line of the tube for heat exchangers characterized by moving along the width direction axis line. The guide is composed of an inner clamp located on the inner side in the rotational radial direction of the cutting blade, and an outer clamp located on the outer side in the rotational radial direction of the cutting blade,
Wherein the clamp and outer clamp sandwiching a tubular member by Rukoto pushing displacement to the tubular member in the radial direction outward pushed the clamp cutting blade cam outside clamp,
Releasing the tubular member from the inner clamp and outer clamp by to be able to kick the far seat displacement to the tubular member in the radial direction inward of the pressed such have the clamp cutting blade cam from outside the clamp The cutting device used for the manufacturing line of the tube for heat exchangers of Claim 1. The guide is located on the inner side of the cutting blade in the radial direction of rotation , and is slidably movable inside the clamp that is biased inwardly in the radial direction of rotation of the cutting blade . Consists of a swingable outer clamp biased radially inward ,
Wherein the clamp and outer clamp sandwiching a tubular member by Rukoto pressing the rotation to the tubular member in the radial direction outward pushed the clamp cutting blade cam outside clamp,
Releasing the tubular member from the inner clamp and outer clamp by to be able to kick the far seat rotation to the tubular member in the radial direction inward of the pressed such have the clamp cutting blade cam from outside the clamp The cutting device used for the manufacturing line of the tube for heat exchangers of Claim 1.

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