Method for designing composite hole pattern of pipe stripping machine for reducing pipe

Abstract

The invention discloses a composite hole pattern design method of a pipe stripping machine for pipe reducing processing, which is used for designing the hole pattern of the pipe stripping machine according to a traditional hole pattern design mode of the pipe stripping machine. Determining a long axis a value and a short axis b value of the hole pattern; determining a central angle theta 1 corresponding to the separation arc ac, and determining an arc radius R1 and a circle center O1 corresponding to the separation arc ac; determining a central angle theta2 corresponding to the link arc ce, determining an arc radius R2 and a circle center O2 corresponding to the link arc ce, and designing and arranging a hole pattern curve to ensure that stress borne by a deformation area can be uniformly distributed in the key process of reducing the diameter of the pipe, so that roller abrasion caused by stress concentration is reduced, and the service life of the pipe is prolonged. According to the device, the service life of the device can be prolonged, the maintenance cost and the downtime are reduced, in addition, the production efficiency is improved through balanced stress distribution, and due to the fact that the device can operate continuously and stably, production interruption caused by device failures or adjustment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pipe processing equipment, and in particular relates to a composite hole design method of a pipe stripping machine used for pipe diameter reduction processing. Background Art

[0002] In the manufacturing process of metal pipes, the diameter reduction process plays a vital role, which directly affects the final quality and performance of the pipes. However, when using the traditional three-roller tube stripping machine for processing, due to the limitations of the hole design, some quality problems often occur in the produced pipes. For example, the pipe may have ridges on the inner surface, or defects such as blue lines and wire drawing on the outer surface. In addition, the wear of the rollers of the traditional tube stripping machine is uniform during the production process, resulting in a low roller life, which not only increases production costs, but also limits the improvement of production efficiency, thereby affecting the overall production economic benefits.

[0003] In view of the above factors, the present invention provides a composite hole design method for a tube stripping machine used for tube diameter reduction processing to solve the above problems and optimize the diameter reduction process, which is of great significance for improving tube quality, reducing costs and improving production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a composite pass design method for a tube stripping machine used for tube diameter reduction processing, so as to solve the problems raised in the above background technology.

[0005] The object of the present invention is achieved through the following technical scheme: a method for designing a composite pass profile of a tube stripping machine for tube diameter reduction processing, comprising the following steps;

[0006] The first step is to design the tube stripping machine hole type according to the traditional tube stripping machine hole type design method.

[0007] Determine the long axis a value and short axis b value of the hole type;

[0008] The second step is to determine the central angle θ1 corresponding to the escape arc ac;

[0009] The third step is to determine the arc radius R1 and the center O1 corresponding to the escape arc ac;

[0010] Step 4: determine the central angle θ2 corresponding to the link arc ce;

[0011] Step 5: Determine the arc radius R2 and center O2 corresponding to the link arc ce;

[0012] The sixth step is to chamfer the roll gap at the roll ring to prevent the sharp corners at the roll gap from scratching the pipe surface during rolling.

[0013] Furthermore, the method for determining the arc radius R1 and the circle center O1 is:

[0014] Use CAD drawing software to draw a straight line ac, and make a perpendicular line with the center point b of the straight line ac, which intersects with the roller seam line oa. The intersection point O1 is the center of the circle corresponding to the detachment arc ac, and O1a is the arc radius R1 corresponding to the detachment arc ac.

[0015] Furthermore, the method for determining the arc radius R2 and the center O2 is:

[0016] Use CAD drawing software to draw a straight line ce, and make a perpendicular line with the center point d of the straight line ce, intersecting with the extension line cO2 of cO1. The intersection point O2 is the center of the circle corresponding to the connecting arc ce, and cO2 is the arc radius R2 corresponding to the detached arc ac.

[0017] Furthermore, the roll gap is chamfered with a 1.5 mm arc at the roll ring to prevent the sharp corners at the roll gap from scratching the surface of the tube during the rolling process.

[0018] Furthermore, the angle range of θ1 is 5-15°.

[0019] Furthermore, the angle range of θ2 is 10-25°.

[0020] Furthermore, the angle θ2 is 15°.

[0021] Furthermore, the bevel angle at the roll gap is set to 90°, and a 1.5 mm arc is used to chamfer the roll gap at the roll ring to prevent the sharp corners at the roll gap from scratching the tube surface during rolling. The bevel angle at the roll gap is precisely set to 90° to achieve a smooth transition of the hole curve at the roll gap, increase the tension at the connecting arc, reduce the tension at the detaching arc, and make the tension distribution in the hole more uniform.

[0022] A composite pass design method for a tube stripping machine for tube diameter reduction processing comprises the following steps:

[0023] The outer diameter of the rough tube out of the continuous rolling mill is set to 183mm, and the outer diameter of the tube stripping machine is set to 175mm. Taking the hole type of the first tube stripping machine as an example, the hole type major axis a value is determined to be 91.85mm and the minor axis b value is 88.54mm;

[0024] Determine the central angle θ1 corresponding to the escape arc ac = 15°;

[0025] Determine the arc radius R1 corresponding to the escape arc ac = 63.57 mm;

[0026] Determine the central angle θ2 corresponding to the link arc ce = 15°;

[0027] Determine the arc radius R2 = 196.71 mm corresponding to the link arc ce.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The composite pass design method of the tube stripping machine of the present invention can reduce the wear and defect generation of the rollers in the production process, reduce the production cost, and also reduce the impact on the environment.

[0030] The application helps to promote the tube processing industry to a more environmentally friendly and sustainable direction.

[0031] The present invention significantly enhances the dimensional accuracy and overall consistency of the pipe, and can effectively prevent defects such as blue lines and wire drawing if combined with a hole series design with positive width expansion.

[0032] The present invention not only significantly reduces the wear of the rollers caused by stress concentration, but also helps to extend the service life of the equipment, reducing maintenance costs and downtime. In addition, the balanced stress distribution also improves production efficiency, because the equipment can operate continuously and stably, reducing production interruptions caused by equipment failure or adjustment. This improvement in stability is directly reflected in product quality, so that the produced pipes have higher consistency and reliability, and meet more stringent quality standards. At the same time, this optimized hole curve distribution makes the tube stripping machine more adaptable to the working conditions where the outer diameter and wall thickness of the rough pipe of the continuous rolling mill are within the upper limit range of the continuous rolling mill design, which can prevent the generation of ridges on the inner surface and increase the rod stripping capacity to a certain extent.

[0033] The present invention improves the service life of the roller by optimizing the hole structure and reduces defects on the inner and outer surfaces of the pipe, thereby meeting the market demand for high-quality pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional schematic diagram of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] like Figure 1 As shown, a composite hole design method for a tube stripping machine for tube diameter reduction processing comprises the following steps;

[0039] The first step is to design the tube stripping machine hole type according to the traditional tube stripping machine hole type design method.

[0040] Determine the long axis a value and short axis b value of the hole type;

[0041] The second step is to determine the central angle θ1 corresponding to the escape arc ac;

[0042] The third step is to determine the arc radius R1 and the center O1 corresponding to the escape arc ac;

[0043] Step 4: determine the central angle θ2 corresponding to the link arc ce;

[0044] Step 5: Determine the arc radius R2 and center O2 corresponding to the link arc ce;

[0045] The sixth step is to chamfer the roll gap at the roll ring to prevent the sharp corners at the roll gap from scratching the pipe surface during rolling.

[0046] According to a further preferred technical solution of the present invention, the method for determining the arc radius R1 and the circle center O1 is:

[0047] Use CAD drawing software to draw a straight line ac, and make a perpendicular line with the center point b of the straight line ac, which intersects with the roller seam line oa. The intersection point O1 is the center of the circle corresponding to the detachment arc ac, and O1a is the arc radius R1 corresponding to the detachment arc ac.

[0048] According to a further preferred technical solution of the present invention, the method for determining the arc radius R2 and the center O2 is:

[0049] Use CAD drawing software to draw a straight line ce, and make a perpendicular line with the center point d of the straight line ce, intersecting with the extension line cO2 of cO1. The intersection point O2 is the center of the circle corresponding to the connecting arc ce, and cO2 is the arc radius R2 corresponding to the detached arc ac.

[0050] According to a further preferred technical solution of the present invention, the roll gap is chamfered with a 1.5 mm arc at the roll ring to prevent the sharp corners at the roll gap from scratching the surface of the tube during the rolling process.

[0051] According to a further preferred technical solution of the present invention, the angle range of θ1 is 5-15°.

[0052] According to a further preferred technical solution of the present invention, the angle range of θ2 is 10-25°.

[0053] According to a further preferred technical solution of the present invention, the angle θ2 is 15°.

[0054] According to a further preferred technical solution of the present invention, the bevel angle at the roll gap is set to 90°, so as to achieve a smooth transition of the hole curve at the roll gap. Specific embodiment one:

[0056] A composite pass design method for a tube stripping machine for tube diameter reduction processing includes the following steps: setting the outer diameter of the rough tube out of the continuous rolling mill to 183 mm and the outer diameter of the tube stripping machine to 175 mm, and designing the pass of the tube stripping machine according to the traditional pass design method of the tube stripping machine. Taking the pass of the first tube stripping machine as an example, it is determined that the long axis a value of the pass is 91.85 mm and the short axis b value is 88.54 mm.

[0057] Determine the central angle θ1 corresponding to the escape arc ac and set θ1 = 15°.

[0058] Use CAD drawing software to draw a straight line ac, and make a perpendicular line with the center point b of the straight line ac, which intersects with the roller seam line oa. The intersection O1 is the center of the circle corresponding to the detachment arc ac, and O1a is the arc radius R1 corresponding to the detachment arc ac. R1 = 63.57 mm.

[0059] Determine the central angle θ2 corresponding to the link arc ce. Set θ2 = 15°.

[0060] Use CAD drawing software to draw a straight line ce, and make a perpendicular line with the center point d of the straight line ce, intersecting with the extension line cO2 of cO1. The intersection point O2 is the center of the circle corresponding to the connecting arc ce, and cO2 is the arc radius R2 corresponding to the detached arc ac. R1 = 196.71mm.

[0061] A 1.5mm arc is used to chamfer the roll gap at the roll ring to prevent the sharp corners at the roll gap from scratching the pipe surface during rolling.

[0062] Optimized hole curve distribution: The present invention designs and arranges the hole curve to ensure that the stress borne by the deformation area can be evenly distributed during the critical process of pipe diameter reduction.

[0063] The tube stripping machine of the present invention adopts a unique roll gap design, and the roll gap bevel angle is precisely 90°, which realizes the smooth transition of the hole curve at the roll gap. In this specific area, the curve is designed to be an arc shape. Such a design can increase the tension at the connecting arc and reduce the tension at the detaching arc, making the tension distribution in the hole more uniform. Thereby significantly enhancing the dimensional accuracy and overall consistency of the pipe. At the same time, if combined with the hole series design of positive width expansion, it can effectively prevent the occurrence of defects such as blue lines and wire drawing.

[0064] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0065] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A composite pass design method for a tube stripping machine for tube diameter reduction processing, characterized in that: The steps include: The first step is to design the hole type of the tube stripping machine according to the traditional hole type design method, and determine the long axis a value and the short axis b value of the hole type; The second step is to determine the central angle θ1 corresponding to the escape arc ac; The third step is to determine the arc radius R1 and the center O1 corresponding to the escape arc ac; Step 4: determine the central angle θ2 corresponding to the link arc ce; Step 5: Determine the arc radius R2 and center O2 corresponding to the link arc ce; The sixth step is to chamfer the roll gap at the roll ring to prevent the sharp corners at the roll gap from scratching the pipe surface during rolling.

2. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 1 is characterized in that: The method for determining the arc radius R1 and the center O1 is: Draw a straight line ac, and make a perpendicular line with the center point b of the straight line ac, intersecting with the roller seam line oa. The intersection point O1 is the center of the circle corresponding to the detachment arc ac, and O1a is the arc radius R1 corresponding to the detachment arc ac.

3. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 2 is characterized in that: The method for determining the arc radius R2 and the center O2 is: Draw a straight line ce, and make a perpendicular line from the center point d of the straight line ce, intersecting with the extension line cO2 of cO1. The intersection point O2 is the center point of the circle corresponding to the connecting arc ce, and cO2 is the arc radius R2 corresponding to the detached arc ac.

4. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 3 is characterized in that: The roll gap is chamfered with a 1.5 mm arc at the roll ring to prevent the sharp corners at the roll gap from scratching the pipe surface during the rolling process.

5. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 4 is characterized in that: The angle range of θ1 is 5-15°.

6. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 5 is characterized in that: The angle range of θ2 is 10-25°.

7. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 6 is characterized in that: The angle θ2 is 15°.

8. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 7 is characterized in that: The bevel angle at the roll gap is set to 90° to achieve a smooth transition of the hole curve at the roll gap.

9. The composite pass design method for a tube stripping machine for tube diameter reduction processing according to claim 8 is characterized in that: The steps include: The outer diameter of the rough tube out of the continuous rolling mill is set to 183mm, and the outer diameter of the tube stripping machine is set to 175mm. Taking the hole type of the first tube stripping machine as an example, the hole type major axis a value is determined to be 91.85mm and the minor axis b value is 88.54mm; Determine the central angle θ1 corresponding to the escape arc ac = 15°; Determine the arc radius R1 corresponding to the escape arc ac = 63.57 mm; Determine the central angle θ2 corresponding to the link arc ce = 15°; Determine the arc radius R2 = 196.71mm corresponding to the connecting arc ce; use a 1.5mm arc at the roller ring to chamfer the roll gap to prevent the sharp corners of the roll gap from scratching the tube surface during rolling. The bevel angle at the roll gap is precisely set to 90° to achieve a smooth transition of the hole curve at the roll gap, increase the tension at the connecting arc, reduce the tension at the detaching arc, and make the tension distribution in the hole more uniform.

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