Round steel rolling hole pattern and design method

Abstract

The invention provides a round steel rolling pass and a design method.The round steel rolling pass comprises a base circle and width expansion parts located on the two sides of the base circle, and each width expansion part is provided with an arc-shaped expansion section; the diameter of the base circle is called the height hk of the hole pattern, and the height hk of the hole pattern is 1.011-1.013 times of the nominal diameter d of the round steel; the width Bk of the notch is greater than the height hk of the hole pattern; the expansion circle where the expansion section is located is externally tangent to the base circle, and the other end of the expansion section is connected with the intersection point of the notch line and the roller seam line. The hole pattern of the rolled round steel does not depend on equipment precision excessively, meanwhile, the rolling precision of a three-roller rolling mill can be achieved by adopting two-roller rolling mill equipment, and the contradiction between quality and investment is solved. Round steel is rolled through the hole pattern, the rolling quality is stable, the hole pattern steel passing capacity is high, and the size precision is high.

Description

Technical Field

[0001] The invention relates to the field of steel rolling, and in particular to a rolled round steel pass profile and a design method. Background Art

[0002] At present, most bar production lines adopt alternating horizontal and vertical continuous rolling production lines, and the main rolling mills are short stress line two-roll mills. In order to pursue higher requirements for rolling size accuracy, some production lines use three-roll reducing and sizing mills such as KOCSK and PSM.

[0003] Generally speaking, the rolling accuracy of a three-roll mill is higher than that of a two-roll mill. However, the three-roll mill has a complex structure and is difficult to maintain. Most of the equipment is expensive, and it is more difficult to obtain the corresponding drawings and spare parts. The short-term accuracy is good, but the accuracy will decrease over time. The quality of maintenance determines the rate of performance degradation. The two-roll mill can make up for the gap in equipment performance through excellent hole design methods, thereby achieving the same level of rolling accuracy for the two.

[0004] In the prior art, the round steel hole design method is usually that the designer determines the size of the expansion circle through experience, and then determines the slot. Because the expansion circle value is usually a range of values, the hole designed with any value within the range may not meet the design accuracy requirements. The traditional round steel hole system design method is heavily dependent on the experience level of the hole designer. It is difficult for an inexperienced designer to design a mature hole system in one go. Summary of the invention

[0005] The purpose of the present invention is to provide a rolled round steel hole profile and a design method, wherein the round steel rolled by the rolled round steel hole profile has a better ovality and improves the precision of the rolled round steel.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A rolled round steel pass, comprising a base circle and width expansion portions located on both sides of the base circle, wherein the width expansion portion has an arc-shaped expansion section; the diameter of the base circle is referred to as the height hk of the pass, and the height hk of the pass is 1.011 to 1.013 times the nominal diameter d of the round steel; the slot width Bk is greater than the height hk of the pass; the expansion circle where the expansion section is located is circumscribed to the base circle, and the other end of the expansion section is connected to the intersection of the slot line and the roll seam line.

[0008] Furthermore, in the above-mentioned rolled round steel pass, the expansion angle θ of the expansion section is 15° to 30°.

[0009] Furthermore, in the above-mentioned rolling round steel pass, the roll gap S is 0.1 times the height hk of the pass.

[0010] Furthermore, in the above-mentioned rolled round steel pass, the radius r of the outer fillet is 3 to 5 mm.

[0011] Furthermore, in the above-mentioned rolled round steel pass profile, the nominal diameter of the round steel is 20 mm to 130 mm.

[0012] Furthermore, in the above-mentioned rolled round steel pass, the expansion angle θ of the expansion section is 30°.

[0013] Furthermore, in the above-mentioned rolled round steel pass, the slot width Bk is 1.01 times the height hk of the pass.

[0014] Furthermore, in the above-mentioned round steel rolling hole profile, when the round steel is rolled using the hole profile, the ovality of the round steel with a nominal diameter less than or equal to 70 mm is ≤0.4 mm, and the ovality of the round steel with a nominal diameter greater than 70 mm is ≤0.6 mm.

[0015] On the other hand, a method for designing the above-mentioned rolling round steel pass is provided, wherein the pass is constructed using drawing software, and the method is characterized in that the method comprises the following steps:

[0016] Step 1) calculating the values ​​of the hole configuration parameters, including the hole height hk, the roll gap S, the slot width Bk, the expansion angle θ and the radius r of the outer fillet;

[0017] Step 2) Draw a base circle, using drawing software to draw a base circle with a diameter equal to the hole height hk;

[0018] Step 3) Draw the roll gap, shift the vertical center line of the base circle to the left and right sides by S / 2 to draw the roll gap line, and then obtain the roll gap;

[0019] Step 4) Draw the notch line, and shift the horizontal center line of the base circle to the upper and lower sides by Bk / 2 to form the notch line;

[0020] Step 5) Draw the expansion angle, rotate the horizontal center line of the base circle in the counterclockwise direction and the clockwise direction by θ with the center of the base circle as the axis, and obtain two expansion angle lines;

[0021] Step 6) draw an expansion section, the starting point of the expansion section is located at the intersection of the expansion angle line and the base circle, the end point of the expansion section is located at the intersection of the notch line and the roll gap phase line, and the expansion section is circumscribed with the base circle;

[0022] Step 7) Draw the outer fillet, mirror the expansion segment and the outer fillet to complete the shape, delete the redundant line segments of the shape, and retain the target shape.

[0023] It can be seen from the analysis that the present invention discloses a hole profile and design method for rolling round steel. The hole profile for rolling round steel can be used as both a finished hole for round steel and a transition extension hole, and has strong adaptability. The hole profile can be used to produce bearing steel, gear steel, spring steel, carbon alloy, some high-alloy steel and other types of steel. The hole profile for rolling round steel is not overly dependent on the accuracy of the equipment, and the accuracy of rolling with a three-roller mill can be achieved by using a two-roller mill, thus resolving the contradiction between quality and investment. The hole profile is used to roll round steel, and the rolling quality is stable, the hole profile has a strong steel passing capacity, and the dimensional accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0025] Figure 1 The figure is a schematic diagram of drawing a base circle according to an embodiment of the present invention.

[0026] Figure 2 FIG. 1 is a schematic diagram of drawing a roller gap according to an embodiment of the present invention.

[0027] Figure 3 FIG. 4 is a schematic diagram of drawing a notch line according to an embodiment of the present invention.

[0028] Figure 4 FIG. 4 is a schematic diagram of drawing a dilation angle according to an embodiment of the present invention.

[0029] Figure 5 A schematic diagram of drawing an expansion section according to an embodiment of the present invention.

[0030] Figure 6 It is a structural schematic diagram of an embodiment of the present invention.

[0031] Figure 7 The figure is a flow chart of a design method according to an embodiment of the present invention.

[0032] Explanation of reference numerals: 1 base circle; 2 expansion section; 3 outer round corner; 4 roller seam line; 5 notch line; 6 expansion angle line. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0034] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numbers and letter labels to refer to features in the drawings. Like or similar labels in the drawings and description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first", "second", "third", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0036] like Figures 1 to 7 As shown, according to an embodiment of the present invention, a rolled round steel hole profile is provided, comprising a base circle 1 and width expansion portions located on both sides of the base circle 1, wherein the width expansion portion has an arc-shaped expansion section 2; the diameter of the base circle 1 is called the height hk of the hole profile, and the height hk of the hole profile is 1.011 to 1.013 times the nominal diameter d of the round steel, that is, hk = (1.011 to 1.013) × d; the slot width Bk is greater than the height hk of the hole profile; the expansion circle where the expansion section 2 is located is circumscribed with the base circle 1, and the other end of the expansion section 2 is connected to the intersection of the slot line 5 and the roller seam line 4.

[0037] Further, the expansion angle θ of the expansion section 2 is 15° to 30°. The smaller the selected value of the expansion angle θ of the expansion section 2, the better the ellipticity, but the commonality becomes worse, and the larger the selected value, the worse the ellipticity, but the commonality becomes better. Preferably, the expansion angle θ of the expansion section 2 is 30°.

[0038] Furthermore, the roll gap S is 0.1 times the height hk of the pass, that is, S = 0.1 × hk. The roll gap S is generally related to the mill bounce, the thermal expansion of the roll, and the deflection of the roll under force. The setting of the above parameters of the roll gap S can avoid rolling defects caused by the adhesion of the upper and lower rolls due to the wear of the pass during rolling. At the same time, the appropriate roll gap can improve the ovality of the rolled round steel.

[0039] Furthermore, the radius r of the rounded corner 3 is 3 to 5 mm. Such an arrangement can avoid scratches on the rolled piece during the rolling process, and can also avoid damage to the pass caused by bumps.

[0040] Furthermore, the nominal diameter of the round steel is 20 mm to 130 mm.

[0041] Furthermore, the slot width Bk is 1.01 times the hole height hk, that is, Bk=1.01×hk.

[0042] Furthermore, when the round steel is rolled using the hole profile, the ovality of the round steel with a nominal diameter less than or equal to 70 mm is ≤0.4 mm, and the ovality of the round steel with a nominal diameter greater than 70 mm is ≤0.6 mm.

[0043] The hole profile of the rolled round steel is a two-roll mill hole profile. Through the precise design of the rolled round steel hole profile, the two-roll mill can meet the accuracy requirements of the three-roll mill, solving the contradiction between quality and investment.

[0044] The present invention also discloses a design method for the above-mentioned rolling round steel pass, such as Figure 7 As shown, the following steps are included:

[0045] Step 1) calculating the values ​​of the hole configuration parameters, including the hole height hk, the roll gap S, the slot width Bk, the expansion angle θ and the radius r of the outer fillet 3;

[0046] Step 2) Draw base circle 1, such as Figure 1 As shown, a base circle 1 with a diameter equal to the hole height hk is drawn using drawing software;

[0047] Step 3) Draw the roller gap, such as Figure 2 As shown, the vertical center line of the base circle 1 is offset to the left and right sides by S / 2 to draw the roller gap line 4, thus obtaining the roller gap;

[0048] Step 4) Draw the notch line 5, such as Figure 3 As shown, the transverse center line of the base circle 1 is offset to the upper and lower sides by Bk / 2 to form a notch line 5;

[0049] Step 5) Draw the expansion angle, such as Figure 4 As shown, the transverse center line of the base circle 1 is rotated counterclockwise and clockwise by θ with the center of the base circle 1 as the axis, and two expansion angle lines 6 are obtained;

[0050] Step 6) Draw expansion segment 2, such as Figure 5 As shown, the starting point of the expansion section 2 is located at the intersection of the expansion angle line 6 and the base circle 1, and the end point of the expansion section 2 is located at the intersection of the notch line 5 and the roller seam line 4, and the expansion section 2 is circumscribed with the base circle 1.

[0051] First, draw a straight line, the starting point of which is located at the intersection of the notch line 5 and the roller seam line 4, and the end point of which is located at the intersection of the expansion angle line 6 and the base circle 1;

[0052] Then draw the perpendicular bisector of the straight line, and draw an expansion circle with the intersection of the perpendicular bisector of the straight line and the expansion angle line 6 as the center. The expansion circle passes through the intersection of the expansion angle line 6 and the base circle 1. The arc between the intersection of the expansion angle line 6 and the base circle 1 and the intersection of the notch line 5 and the roller seam line 4 is the expansion section 2.

[0053] In one embodiment of the present invention, the nominal diameter d of the target round steel to be rolled is 60 mm, the hole height hk=1.012×d=60.72 mm, the roll gap S=0.1×hk=6.072 mm, the slot width Bk=1.01×d=61.3272 mm, the expansion angle θ=30°, the radius r of the outer fillet 3=4 mm, and the radius R of the expansion circle is measured to be 36.55 mm.

[0054] Step 7) Draw the outer fillet 3, and use arc chamfering to draw the outer fillet 3 of the roller seam line 4 and the expansion section 2, such as Figure 6 As shown, the mirrored expansion segment 2 and the rounded corner 3 complete the graphic, delete the redundant line segments of the graphic, and retain the target graphic.

[0055] The design method first uses a formula to calculate the determined value of the slot width Bk, and then uses a graphical method to determine the unique expansion circle. Compared with the hole design method in the prior art, the design method of the rolled round steel hole type can use an accurate formula to calculate the size of the expansion circle by reversing the order of the steps of determining the slot and determining the expansion circle.

[0056] During the operation of the actual production line, the round steel rolled using the round steel hole profile designed using the above design method has good ovality, stable rolling quality, strong hole profile passing capacity, high dimensional accuracy, and a simple calculation formula.

[0057] The design method of the rolled round steel hole type greatly reduces the design difficulty of the rolled round steel hole type by designing a fixed calculation formula and using drawing software for auxiliary drawing. The technical indicators can be achieved after stable rolling: ≤φ70mm round steel, ovality ≤0.4mm; >φ70mm round steel, ovality ≤0.6mm.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] A rolled round steel hole profile and design method, the rolled round steel hole profile can be used as both a finished round steel hole and a transition extension hole, has strong adaptability, and can be used to produce bearing steel, gear steel, spring steel, carbon alloy, some high-alloy steel and other steels. The rolled round steel hole profile does not rely too much on the equipment accuracy, and can also achieve the rolling accuracy of a three-roller rolling mill by using a two-roller rolling mill, thus solving the contradiction between quality and investment. The rolled round steel is rolled using the hole profile, and the rolling quality is stable, the hole profile has a strong steel passing capacity, and the dimensional accuracy is high.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rolled round steel pass, characterized in that: It includes a base circle and width expansion parts located on both sides of the base circle, wherein: The width expansion portion has an arc-shaped expansion section; The diameter of the base circle is called the height hk of the hole type, and the height hk of the hole type is 1.011 to 1.013 times the nominal diameter d of the round steel; The slot width Bk is greater than the height hk of the hole; The expansion circle where the expansion section is located is circumscribed to the base circle, and the other end of the expansion section is connected to the intersection of the notch line and the roller seam line.

2. The rolled round steel pass according to claim 1, characterized in that: The expansion angle θ of the expansion section is 15° to 30°.

3. The rolled round steel pass according to claim 1, characterized in that: The roll gap S is 0.1 times the height hk of the hole.

4. The rolled round steel pass according to claim 1, characterized in that: The radius r of the outer corner is 3 to 5 mm.

5. The rolled round steel pass according to claim 1, characterized in that: The nominal diameter of the round steel is 20 mm to 130 mm.

6. The rolled round steel pass according to claim 1, characterized in that: The expansion angle θ of the expansion section is 30°.

7. The rolled round steel pass according to claim 1, characterized in that: The slot width Bk is 1.01 times the height hk of the hole.

8. The rolled round steel pass according to claim 1, characterized in that: The round steel is rolled using the hole profile, and the ovality of the round steel with a nominal diameter less than or equal to 70 mm is ≤0.4 mm, and the ovality of the round steel with a nominal diameter greater than 70 mm is ≤0.6 mm.

9. A method for designing a rolling round steel pass according to any one of claims 1 to 8, wherein the pass is constructed using drawing software, characterized in that: The steps include: Step 1) calculating the values ​​of the hole configuration parameters, including the hole height hk, the roll gap S, the slot width Bk, the expansion angle θ and the radius r of the outer fillet; Step 2) Draw a base circle, using drawing software to draw a base circle with a diameter equal to the hole height hk; Step 3) Draw the roll gap, shift the vertical center line of the base circle to the left and right sides by S / 2 to draw the roll gap line, and then obtain the roll gap; Step 4) Draw the notch line, and shift the horizontal center line of the base circle to the upper and lower sides by Bk / 2 to form the notch line; Step 5) Draw the expansion angle, rotate the horizontal center line of the base circle in the counterclockwise direction and the clockwise direction by θ with the center of the base circle as the axis, and obtain two expansion angle lines; Step 6) draw an expansion section, the starting point of the expansion section is located at the intersection of the expansion angle line and the base circle, the end point of the expansion section is located at the intersection of the notch line and the roll gap phase line, and the expansion section is circumscribed with the base circle; Step 7) Draw the outer fillet, mirror the expansion segment and the outer fillet to complete the shape, delete the redundant line segments of the shape, and retain the target shape.

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