TW201607711A - Pipe cutting blade structure dedicated for hydraulic pipe - Google Patents

Abstract

Disclosed is a pipe cutting blade structure dedicated for hydraulic pipes, comprising a blade body that comprises an angle-cutting edge, which has an inverted V-shape. The angle-cutting edge comprises the first edge and the second edge on a front side of the blade body. The first edge and the second edge intersect each other to define the first internal angle. The angle-cutting edge comprises the first cutting edge and the second cutting edge on a back side of the blade body, and the first cutting edge and the second cutting edge intersect each other to define the second internal angle. The second internal angle is a rounded angle. The blade structure is mounted on a pipe cutting machine and a hydraulic power device drives the blade body to cut off a hydraulic pipe by means of the angle-cutting edge.

Description

Special pipe cutting blade structure for oil pressure pipe

The present invention relates to a cutting blade for a hydraulic tube.

The cross-sectional structure of the oil pressure pipe is as shown in the first figure, and the inner layer is a weathering, temperature-resistant and oil-resistant synthetic rubber layer 10, with one or several layers of high-tensile steel wire mesh 11 in the middle, and a solid fiber braid 12 on the outer layer.

The oil pipe is cut through an electric hydraulic pipe cutting machine. The blades of the traditional pipe cutting machine are shown in the second and third figures. The blade 13 of the second figure has a convex arc portion 131, and the blade 14 of the third figure has a concave arc portion 141. The oil pipe 15 to be cut is placed on the anvil 16 of the pipe cutter. When the blades 13, 14 cut the hydraulic tube 15 by the blade portions 131, 141, the blade portions 131, 141 of the blades 13, 14 have a circular arc shape, and the oil pressure tube 15 has a circular cross section, so the blade portions 131, 141 and the oil The initial contact of the pressure tube 15 is "single point contact", the cutting action is started from a contact point, and when the blades 13, 14 are cut along the radial direction of the oil pressure tube 15, the cutting action progresses from a single point contact to a single line contact. Until the cutting edges 131, 141 of the blades 13, 14 are cut through the cross section of the entire oil pressure tube 15.

The disadvantage of the above-mentioned blade and cutting mode is that the cutting speed is slow, due to the circular arc-shaped blade and the cutting action progressing from single-point cutting to single-line cutting, and when the cutting action progresses to single-line contact, the cutting line passes almost horizontally. The cross section of the oil pressure pipe, the feed resistance becomes larger, the feed speed becomes slower, the cutting force becomes weaker, and the oil pressure pipe is covered by the structural layer with firmness and toughness, when the blade has large feed resistance and slow speed When the cutting force is weak, it will be difficult for the structural layers to be cut off smoothly. The problem is that the cut surface is not flat, the oil pressure pipe cut surface is crushed and deformed, and the outer layer of the oil pressure pipe at the end of the cutting is not broken.

The object of the present invention is to provide a special pipe cutting blade structure for a hydraulic pipe, which has the advantages of slow cutting speed, high feed resistance, slow feed rate, weak cutting force, uneven cutting surface and oil for solving the blade of the traditional pipe cutting machine. The pressure tube is pressed and deformed, and the outer layer of the oil pressure tube at the end of the cutting is not broken.

The blade of the present invention achieves the above object, comprising a blade body having a front surface and a back surface, a solid structure between the front surface and the back surface, the solid structure forming a thickness of the blade body; the lower edge of the blade body having a corner cutting blade having an inverted V shape, the chamfering blade having a first edge and a second edge on the front surface of the blade body, the first edge and the second edge intersecting to form a first inner corner, the first inner corner is rounded; the chamfering blade has a first cutting edge and a second cutting edge on the back side of the knife body, and the first cutting edge and the second cutting edge intersect to form a second inner corner, the second inner corner being rounded. The first cutting edge and the second cutting edge are lower than the first edge and the second edge at the position of the blade body, so that a first bevel is formed between the first edge and the first cutting edge A second inclined surface is formed between the second edge and the second cutting edge, and the inner angle is inclined between the first inner angle and the second inner angle.

Further, the angle of the second interior angle is greater than the first interior angle.

Further, the angle of the second internal angle is between 110° and 120°. The angle of the first interior angle is between 80° and 90°.

Further, the first inner corner and the second inner corner have a fillet radius of 2 mm to 4 mm.

The initial contact between the chamfering blade and the hydraulic tube is "two-point contact", that is, the circular surfaces on both sides of the center line of the hydraulic tube form a contact point with the first cutting edge and the second cutting edge. When the pipe cutter drives the blade body through the oil pressure, the cutting is started along the radial direction of the oil pressure pipe through the two contact points; then, the first cutting edge and the second cutting edge respectively start from the respective contact points thereof. Entering the structural layers of the oil pressure pipe and expanding into a cutting line respectively, the two cutting lines are respectively oblique with the vertical center line of the oil pressure pipe; and then, when the second inner angle passes the surface of the oil pressure pipe The first cutting edge, the second cutting edge, and the second inner corner form a continuous inverted V-shaped cutting line. The cutting mode of the oil body tube of the knife body is the first two points cutting with the infeed stroke, progressing into two line cuttings, and then progressing into continuous inverted V-shaped line cutting, and gradually expanding the cutting surface of the oil pressure tube. The cutting speed of the present invention is faster than the prior art single point cutting progressing to the single line cutting mode.

The first cutting edge and the second cutting edge are both oblique cutting edges, and the oblique cutting edge reduces the resistance of the cutting edge through the hydraulic tube layer structure, so that the feeding resistance is reduced, the cutting speed and the cutting force are increased, and the extrusion on the opposite side of the oil pressure tube is reduced. Pressure, so that the cross-sectional contour shape of the oil pressure pipe can be maintained intact.

The second inner corner has a rounded corner design and cooperates with the first cutting edge and the second cutting edge to form a shearing force on the hydraulic tube structural layer, the shearing force increases the cutting ability of the cutting blade, reduces the cutting resistance, and more A shear concentration point is formed at the end of the cut to cause the outer layer of the hydraulic tube to completely break off.

20‧‧‧Tool body

22‧‧‧ positive

24‧‧‧Back

26‧‧‧solid structure

30‧‧‧Corner blade

31‧‧‧ first edge

32‧‧‧second edge

33‧‧‧First cutting edge

34‧‧‧second cutting edge

35‧‧‧First interior corner

36‧‧‧second inner corner

37‧‧‧First slope

38‧‧‧Second slope

39‧‧‧Inner angle bevel

40‧‧‧Cutting machine

41‧‧‧Hydraulic power plant

42‧‧‧Vertical saddle

43‧‧‧ Anvil

50‧‧‧Hydraulic tube

P1, P2‧‧‧ touch points

L1, L2‧‧‧ cutting line

D1‧‧‧ Relative straight line distance from the end of the first cutting edge to the end of the second cutting edge

D2‧‧‧Hydraulic tube diameter size

The first picture is a cross-sectional view of a conventional hydraulic tube.

The second figure is a schematic view of the first embodiment of the blade of the conventional pipe cutting machine, the anvil and the oil pressure pipe.

The third figure is a schematic view of the second embodiment of the blade of the conventional pipe cutting machine, the anvil and the oil pressure pipe.

The fourth figure is a plan view of the blade structure of the present invention.

The fifth picture is a cross-sectional view of 5-5 of the fourth figure.

The sixth figure is a schematic view of the blade of the present invention installed on a hydraulic pipe cutting machine.

The seventh figure is one of the schematic diagrams of the frontal action of the blade cutting oil pressure pipe of the present invention.

The eighth figure is the second schematic diagram of the front action of the blade cutting oil pressure pipe of the present invention.

The ninth figure is the third schematic view of the front action of the blade cutting oil pressure pipe of the present invention.

The tenth figure is one of the schematic diagrams of the cross-section action of the blade cutting oil pressure pipe of the present invention.

The eleventh figure is the second schematic diagram of the cross-sectional action of the blade cutting oil pressure pipe of the present invention.

The twelfth figure is the third schematic view of the profile action of the blade cutting hydraulic pressure pipe of the present invention.

4 and 5, the blade of the present invention includes a blade body 20 having a front surface 22 and a back surface 24, and a solid structure 26 between the front surface 22 and the back surface 24, the solid structure forming the blade The thickness of the body 20; the lower edge of the blade body 20 has an angled blade 30 having an inverted V shape, and the angled blade 30 has a first edge 31 on the front surface 22 of the blade body 20. And a second edge 32, the first edge 31 and the second edge 32 intersect to form a first inner angle 35, the first inner angle 35 is rounded, the radius of the fillet is 2mm-4mm; The blade 30 has a first cutting edge 33 and a second cutting edge 34 on the back surface 24 of the blade body 20. The first cutting edge 33 and the second cutting edge 34 intersect to form a second inner corner 36. The corner 36 is rounded and has a fillet radius of 2 mm to 4 mm. The angle of the second interior angle 36 is greater than the first interior angle 35. The angle of the second interior angle 36 is between 110° and 120°. The angle of the first interior angle 35 is between 80° and 90°. The first cutting edge 33, the second cutting edge 34 and the second inner angle 36 are lower than the first edge 31, the second edge 32 and the first inner corner 35 at the position of the blade body 20, Between the first cutting edge 31 and the first cutting edge 33 is a first inclined surface 37, and between the second cutting edge 32 and the second cutting edge 34 is a second inclined surface 38, the first inner angle 35 to the second inner side Between the corners 36 is an internal angle bevel 39.

As shown in the sixth figure, the blade body 20 is mounted to all of the tube machines 40, and the hydraulic power unit 41 of the tube cutter 40 drives the blade body 20 to move up and down along the vertical saddle 42. A hydraulic tube 50 to be cut is placed on the anvil 43 of the pipe cutter 40.

The tube cutting action of the blade of the present invention is described as in the seventh to twelfth drawings.

As shown in the seventh and tenth drawings, the initial contact between the chamfering blade 30 and the hydraulic tube 50 is "two-point contact", that is, the circular surfaces on both sides of the vertical center line of the hydraulic tube 50 and the first cutting edge 33 and The second cutting edge 34 forms a contact point P1, P2. When the pipe cutter drives the blade body 20 downward by the oil pressure, the two contact points P1 and P2 start to move along the radial direction of the oil pressure pipe 50 and cut.

Then, as shown in the eighth and eleventh views, the first cutting edge 33 and the second cutting edge 34 respectively move from the respective contact points P1 and P2 along the radial direction of the oil pressure tube 50 and expand into a cutting line L1. L2, when the second inner corner 36 passes the surface of the hydraulic tube 50, the first cutting edge 33, the second cutting edge 34, and the second inner angle 36 form a continuous inverted V-shaped cutting line. .

Finally, as in the ninth and twelfth drawings, the inverted V-shaped cutting line passes through the entire oil pressure tube 50 until the second inner angle 36 cuts off the end of the outer structure of the oil pressure tube 50.

The cutting mode of the knife body 20 to the oil pressure tube 50 is initially cut at two points (two contact points of P1 and P2) with the infeed stroke, and then progresses into two line cuttings (by the first cutting edge 33 and the second cutting) The cutting lines L1, L2) formed by the blade 34 are further advanced into a continuous inverted V-shaped wire cutting (an inverted V-shaped cutting line composed of the first cutting edge 33, the second cutting edge 34 and the second inner corner 36), The cutting surface of the oil pressure tube 50 is gradually enlarged. In addition, the first cutting edge 33 and the second cutting edge 34 are a diagonal cutting edge, and the oblique cutting edge reduces the resistance of the cutting edge through the hydraulic tube layer structure, so that the feeding resistance is reduced, and the cutting speed and the cutting force are improved. Moreover, the rounded corner design of the second inner corner 36 cooperates with the first cutting edge 33 and the second cutting edge 34. For this reason, a shearing force is formed on the structural layer of the hydraulic tube 50, which helps to reduce the resistance of the chamfering blade 30 through the outer structure of the hydraulic tube 50, enhance the shearing force, and can promote the cutting end. The outer layer of the oil pressure tube 50 is completely broken.

When the knife body 20 cuts the oil pressure tube 50, the first slope surface 37, the second slope surface 38 and the inner angle slope surface 39 help the chamfering blade 30 to peel off the oil pressure tube 50 while cutting the oil pressure tube. Cut the face. And because the intersection angle of the first edge 31 and the second edge 32 is different from the intersection angle of the first cutting edge 33 and the second cutting edge 34, the first inclined surface, the second inclined surface and the inner angle inclined surface form an intermediate portion The range of the slope of the area is the largest and the change is gradually smaller toward both sides. Therefore, the peeling force applied to the cut portion of the oil pressure tube 50 is that the intermediate portion is larger than the both sides, and the cut surface of the oil pressure tube 50 is stably peeled off. The cut surface is flatter.

In addition, the blade of the same width dimension of the present invention can cut hydraulic tubes of different diameters, the diameter range of which is related to the maximum opening width of the chamfering blade 30. As shown in the fourth figure, the maximum opening width of the chamfering blade 30 is defined by the relative linear distance D1 from the end of the first cutting edge 33 to the extreme end of the second cutting edge 34. The diameter of the hydraulic tube 50 The dimension D2 should fall within a range of less than or equal to two-thirds of the linear distance D1, that is, D2≦D1×2/3.

In summary, the blade of the invention has the advantages of fast cutting speed, small feed resistance, fast feed speed, strong cutting force, smooth cut surface of the oil pressure pipe, no compression deformation of the oil pipe cut surface, and outer layer of the oil pressure pipe at the cutting end point. Can be completely disconnected and other functions.

20‧‧‧Tool body

22‧‧‧ positive

30‧‧‧Corner blade

31‧‧‧ first edge

32‧‧‧second edge

33‧‧‧First cutting edge

34‧‧‧second cutting edge

35‧‧‧First interior corner

36‧‧‧second inner corner

37‧‧‧First slope

38‧‧‧Second slope

39‧‧‧Inner angle bevel

50‧‧‧Hydraulic tube

Claims (7)

The utility model relates to a special pipe cutting blade structure for a hydraulic pipe, comprising a cutter body having a front surface and a back surface, and a solid structure between the front surface and the back surface, the solid structure constituting a thickness of the knife body; The blade body has a corner cutting blade having an inverted "V" shape; the chamfering blade has a first edge and a second edge on the front surface of the blade body, the first edge and the first edge The second edge intersects to form a first inner corner; the chamfer blade has a first cutting edge and a second cutting edge on the back side of the blade body, the first cutting edge and the second cutting edge intersect to form a second An inner corner, the second inner corner is rounded; the first cutting edge, the second cutting edge and the second inner corner are lower than the first edge, the second edge and the first inner angle; a first inclined surface between the first cutting edge and the first cutting edge, and a second inclined surface between the second cutting edge and the second cutting edge, the first inner angle to the second inner angle The inner corner is beveled. The special pipe cutting blade structure for a hydraulic pipe according to claim 1, wherein the first inner corner is rounded. The special pipe cutting blade structure for a hydraulic pipe according to claim 2, wherein the first inner corner has a fillet radius of 2 mm to 4 mm. The special pipe cutting blade structure for a hydraulic pipe according to claim 1, wherein the angle of the second inner angle is greater than the first inner angle. The special pipe cutting blade structure for a hydraulic pipe according to claim 1, wherein the first inner angle is between 80° and 90°. The utility model as claimed in claim 1 , wherein the second inner angle has an angle of between 110° and 120°. The special pipe cutting blade structure for a hydraulic pipe according to the first aspect of the invention, wherein the second inner corner has a fillet radius of 2 mm to 4 mm.