A cavity of a rolling ring machine can be adjusted on line

Abstract

The application provides an online-adjustable cavity mold applied to a ring rolling machine, comprising an adjusting mold; the adjusting mold comprises a pressing roller main body and an adjusting assembly; the pressing roller main body is provided with a side ring on the side close to the ring rolling machine; the pressing roller main body is provided with a first step part and a second step part in a stepped manner; the adjusting assembly comprises a blocking ring slidably sleeved on the first step part and a supporting ring slidably sleeved on the second step part; the blocking ring is detachably fixedly connected with the supporting ring; the supporting ring is circumferentially and intervally provided with a top wire adjusting assembly for pressing the side wall of the pressing roller main body and a bolt positioning assembly for threadedly connecting the side wall of the pressing roller main body; the blocking ring and the side ring are spaced apart to form a stepless adjusting cavity with a set width range W. In the application, the cavity width is adjusted online, the mold disassembly process is reduced, the mold manufacturing cost is reduced, the precision adjustment of the cavity width is improved, and the production efficiency is simultaneously improved.

Description

Technical Field

[0001] This application relates to the field of mold technology for ring rolling mills, and in particular to a mold with an online adjustable cavity for use in ring rolling mills. Background Technology

[0002] Vertical ring rolling mills are important equipment for producing ring forgings. They forge ring-shaped blanks into seamless circular ring products. The die system includes roll cavities that accommodate the rings to be processed in a partially deformed state. The dimensions of the rings are mainly controlled by the roll cavities. High-performance seamless rings, especially in aerospace, wind power, bearings, and rail transportation, have very high requirements for radial and axial dimension control, and thus require high precision from the roll cavities.

[0003] In existing technologies, the design and disassembly methods for roll cavity structures generally fall into two categories: 1. Using fixed cavity molds, designing corresponding roll cavities for products with different cross-sectional shapes and specifications. Different roll molds need to be replaced to produce different products, as shown in the attached diagram. Figure 1 As shown, the mold includes a mold body 100, on which a fixed cavity 110 is provided. When producing ring forgings, an integral roll mold with a corresponding cavity is first designed and manufactured according to the rings with different cross-sectional shapes and sizes. For example, if the cross-sectional width of the ring is 50mm, then a fixed cavity 110 with a width of 50mm is provided on the corresponding mold body 100. Although this type of fixed cavity mold is simple and reliable, when producing rings with cross-sectional widths of 30mm, 35mm, etc., it is necessary to replace the mold body 100 with a matching cavity. One product requires one mold cavity. This is suitable for a small number of types, large consumption of mold materials, and high mold manufacturing costs, especially when frequent replacement is required in the forging process of multiple types of rings.

[0004] II. A modular mold structure is adopted, as shown in the attached document. Figure 2As shown, the combined mold 200, the mold washer 210 assembled on the combined mold 200, the inner ring 220 disposed inside the mold washer 210, the outer ring 230 disposed outside the mold washer, and the clamping member 250 for pressing and fixing on the spindle; the inner ring 220 and the outer ring 230 form a forging cavity 240 after clamping and fixing the corresponding mold washer 210. Therefore, when producing rings with different cross-sectional widths, it is not necessary to remove the entire combined mold 200 from the spindle. Only the corresponding mold washer 210, inner ring 220, and outer ring 230 need to be replaced to form the corresponding forging cavity 240. Although this replacement method has a certain degree of flexibility, as only the corresponding mold washer 210 needs to be replaced when producing different products, which can reduce mold costs, it has the limitation of being applicable to a limited range of products and is only suitable for forging rings in large batches. In the process of forging rings with different cross-sectional widths, the width of the mold washer 210 is adjusted by adding or subtracting it. However, this ± width adjustment is very limited. For example, if the width of the mold washer 210 is in the unit of ±5mm, then for some special widths (such as 52mm and 53mm), a mold washer 210 of a specified width needs to be manufactured, which will result in the matching degree not meeting the optimal requirements and the cavity accuracy not meeting the high requirements.

[0005] Both of these mold types require specialized molds for forging rings with different cross-sectional dimensions, which lacks production flexibility for users who frequently produce a variety of ring products in small batches. Mold material consumption is high, and material utilization is low. Changing molds requires stopping the machine for complete disassembly and installation, which is time-consuming and labor-intensive. This makes it difficult to maintain stable precision in the mold system, resulting in low product qualification rates, short mold lifespan, frequent downtime leading to low production efficiency, severe spindle wear, and significant equipment damage. Utility Model Content

[0006] This application provides an online adjustable mold for a ring rolling mill, which uses a stepless adjustment method to change the cavity width, reduces mold disassembly operations, lowers mold manufacturing costs, improves the precision adjustment of the cavity width, and simultaneously improves production efficiency, enabling multiple types of online adjustment.

[0007] This application provides an online adjustable mold for a ring rolling mill, comprising an adjusting mold mounted on the main shaft of the ring rolling mill; the adjusting mold includes: a pressure roller body, and an adjusting assembly slidably connected to and lockable on the pressure roller body; wherein, a side ring is provided on the side of the pressure roller body near the ring rolling mill, and a first step portion and a second step portion are provided on the pressure roller body in a stepped manner; the adjusting assembly includes: a retaining ring slidably fitted on the first step portion, and a support ring slidably fitted on the second step portion; the retaining ring and the support ring are detachably fixedly connected; the support ring is circumferentially spaced with a set screw adjusting assembly for pressing against the side wall of the pressure roller body, and circumferentially spaced with a bolt positioning assembly for threaded connection to the side wall of the pressure roller body; the distance between the retaining ring and the side ring forms a steplessly adjustable cavity with a set width range W.

[0008] In this application, the distance between the retaining ring and the side ring is adjusted by a set screw adjustment assembly, achieving cavity width adjustment during stepless adjustment. This satisfies the online adjustment needs of various types of ring parts, reduces the process of disassembling and changing molds, and reduces wear on the spindle during replacement. The locking and positioning of the bolt positioning assembly ensures precise positioning of the infinitely adjustable cavity width. The adjustment method is simple and reliable, reducing mold manufacturing costs and improving online adjustment efficiency. It offers advantages such as high precision, quality stability, production flexibility, simple structure, and low material consumption. Production flexibility is high: different sizes of ring parts can be produced through program adjustments, with short changeover times, making it suitable for modern manufacturing models involving multiple varieties and small to medium batches.

[0009] In one specific implementation, the center of the pressure roller body is provided with a mounting hole that matches the main shaft. The roller is then fixed in place via this mounting hole.

[0010] In one specific implementation, the pressure roller body is connected to the main shaft via a clamping ring. The clamping ring has a chamfer that matches the mounting hole, and a locking bolt threaded onto the main shaft is fitted onto the clamping ring, achieving a tight fit.

[0011] In one specific implementation, the first stepped portion is higher than the second stepped portion, and the support ring and the retaining ring are connected by bolts, thus achieving a detachable fixed connection.

[0012] In one specific implementation, the support ring includes: a platform portion, a first bent portion, and a second bent portion; wherein the first bent portion is connected to the upper part of a first end of the platform portion, and the second bent portion is connected to the lower part of a second end of the platform portion; the first bent portion is connected to the retaining ring by bolts; the second bent portion is fitted with a staggered set screw assembly and a bolt positioning assembly. The set screw adjustment assembly and the bolt positioning assembly are assembled in a staggered manner to maintain positioning and adjustment balance.

[0013] In one specific implementation, the first bending portion, the second bending portion, and the platform portion are integrally formed into a ring-shaped body. Installation performance is stable and reliable.

[0014] In one specific implementation, the set screw adjustment assembly includes at least six set screws equidistantly spaced along the circumference of the second bend; and the set screw stroke S1 of each set screw is equal to (W - W1), where W1 represents the initial cavity width of the steplessly adjustable cavity. By employing set screw adjustment, stepless width adjustment is achieved, which can accommodate the machining of various types of ring parts.

[0015] In one specific implementation, the bolt positioning assembly includes at least six locking bolts equidistantly spaced along the circumference of the second bend; and the locking stroke S2 ​​of each locking bolt is greater than or equal to (W - W1). This achieves the positioning function after width adjustment and maintains the adjustment balance.

[0016] In one specific feasible implementation, the set width range W is 30mm~120mm. This reduces mold manufacturing costs and meets the production needs of various types of ring parts. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a fixed cavity mold in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of a modular mold in the prior art; Figure 3 This is a schematic diagram of the structure of an online adjustable mold for a ring rolling mill, provided in an embodiment of this application. Figure 4 This is an assembly diagram of an online adjustable mold for a ring rolling mill, provided in an embodiment of this application. Figure 5 This is a schematic diagram illustrating the adjustment of an online adjustable mold for a ring rolling mill, as provided in an embodiment of this application.

[0019] Icon labels: Mold body 100, fixed cavity 110; Combination mold 200, mold washer 210, inner ring 220, outer ring 230, forging cavity 240, clamping part 250; Pressure roller body - 300, side ring - 301, first step section - 302, second step section - 303, retaining ring - 310, support ring - 320, platform section - 321, first bending section - 322, second bending section - 323, bolt - 330, set screw adjustment assembly - 340, bolt positioning assembly - 350, main shaft - 400, clamping ring - 500, locking bolt - 510. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] To facilitate understanding of the online adjustable cavity mold for ring rolling mills provided in this application, its application scenario is first explained. Traditional methods for adjusting and replacing the roll molds on vertical ring rolling mills often require stopping the machine and disassembling the entire machine, which is time-consuming and labor-intensive. Different sizes of products require specially made rolls, consuming a large amount of mold material. Often, specialized molds need to be made, and mold replacement requires a significant amount of disassembly and installation work. For users who frequently produce a variety of ring products in small batches, frequent mold changes significantly increase manufacturing costs and do not substantially improve production efficiency. Therefore, this application provides an online adjustable cavity mold for ring rolling mills, employing a stepless adjustment method to change the cavity width, reducing mold disassembly procedures, and enabling online adjustment for various types of products.

[0023] refer to Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a fixed cavity mold in the prior art; when a fixed cavity mold is used in a ring rolling mill, as shown in the attached diagram. Figure 1As shown, the mold includes a mold body 100, on which a fixed cavity 110 is provided. When producing ring forgings, an integral roll mold with a corresponding cavity is designed and manufactured according to the ring with different cross-sectional shapes. For example, if the cross-sectional width of the ring is 50mm, then a fixed cavity 110 with a width of 50mm is provided on the corresponding mold body 100. Although this type of fixed cavity mold is simple and reliable, when producing rings with cross-sectional widths of 30mm, 35mm, etc., it is necessary to replace the mold body 100 with a matching cavity. One product requires one mold cavity, which is suitable for a small variety of products, greatly increases the mold manufacturing cost, and requires frequent replacement during the forging process of multiple types of rings. The frequent mold replacements affect production efficiency and are very likely to cause wear on the spindle.

[0024] Figure 2 This is a schematic diagram of a combined mold structure in existing technology; a combined mold structure is used in the ring rolling mill, as shown in the attached diagram. Figure 2 As shown, the combined mold 200, the mold washer 210 assembled on the combined mold 200, the inner ring 220 disposed inside the mold washer 210, the outer ring 230 disposed outside the mold washer, and the clamping member 250 for pressing and fixing on the spindle; the inner ring 220 and the outer ring 230 form a forging cavity 240 after clamping and fixing the corresponding mold washer 210. Therefore, when producing rings with different cross-sectional widths, it is not necessary to remove the entire combined mold 200 from the spindle. Only the corresponding mold washer 210, inner ring 220, and outer ring 230 need to be replaced to form the corresponding forging cavity 240. Although this replacement method has a certain degree of flexibility, as only the corresponding mold washer 210 needs to be replaced when producing different products, which can reduce mold costs, it has the limitation of limited applicability and is only suitable for forging ring products with large batches. In the process of forging rings with different cross-sectional widths, the ± width is greatly limited by matching adjustment by adding or subtracting the width of the mold washer 210. For example, if the width of the mold washer 210 is in the unit of ±5mm, then for some special widths (such as 52mm and 53mm) of rings, a mold washer 210 of a specified width needs to be manufactured, which makes it impossible to achieve the best matching degree.

[0025] Combination Figure 1 and Figure 2 As can be seen, both types of molds require the manufacture of specialized molds for forging rings with different cross-sectional dimensions. Changing the molds requires a significant amount of disassembly and installation work. For users who frequently produce a variety of ring products in small batches, the need to frequently change molds greatly increases production costs and does not significantly improve production efficiency.

[0026] refer to Figure 3 and Figure 4As shown, for this purpose, the embodiment of this application provides an online adjustable mold for a ring rolling mill. The online adjustable mold for a ring rolling mill includes an adjustment mold mounted on the main shaft 400 of the ring rolling mill. The adjustment mold is fixedly installed on the main shaft 400 and realizes online adjustment, reducing disassembly and replacement procedures, thereby reducing wear and tear on the main shaft 400 and improving the operating efficiency of the main shaft 400.

[0027] Meanwhile, the adjustment mold in this application has the ability to match and adjust the width of various types of ring parts. The adjustment method is simple and convenient, the adjustment width is accurate and reliable, the ring part forming qualification rate is improved, the mold manufacturing cost is reduced, the online adjustment needs are met, and the production efficiency is improved.

[0028] The adjusting mold includes: a pressure roller body 300, and an adjusting assembly that is slidably connected to and lockable on the pressure roller body 300; the pressure roller body 300 has a mounting hole at its center that matches the main shaft 400. Both sides of the mounting hole are provided with chamfered bevels. The pressure roller body 300 is connected to the main shaft 400 via a clamping ring 500. The clamping ring 500 has chamfers that match the mounting hole, and a locking bolt 510 threadedly connected to the main shaft 400 is fitted on the clamping ring 500. The pressure roller body 300 is fixedly mounted on the main shaft 400 through mounting holes. After the pressure roller body 300 is mounted on the main shaft 400, the frequency of disassembly and replacement is reduced. Under conditions without significant wear, disassembly and replacement are not required. During cavity width adjustment, the cavity width is adjusted only through the adjustment component, without the need to remove and replace the pressure roller body 300. This reduces mold manufacturing costs, reduces wear on the main shaft 400 during replacement, and extends the service life of the main shaft 400. The pressure roller body 300 maintains stable performance while being fixedly mounted on the main shaft 400. The overall adjustment range is achieved solely through the adjustment component, making it suitable for forging various types of ring parts.

[0029] Combination Figure 5 As shown, the pressure roller body 300 has a side ring 301 on the side near the ring rolling mill, and the pressure roller body 300 has a first step portion 302 and a second step portion 303 arranged in a stepped manner; the pressure roller assembly is designed in a stepped form to meet adjustment requirements and ensure balanced width positioning. Specifically, the adjustment assembly includes: a retaining ring 310 that slides on the first step portion 302, and a support ring 320 that slides on the second step portion 303; the first step portion 302 is higher than the second step portion 303, and the support ring 320 and the retaining ring 310 are connected by bolts 330. This allows for a detachable fixed connection between the support ring 320 and the retaining ring 310.

[0030] In this application, by adjusting the position of the support ring 320, the distance between the retaining ring 310 and the side ring 301 is changed simultaneously, thereby adjusting the width of the cavity. The adjustment method is simple and convenient, and the support ring 320 and the retaining ring 310 are linked. The support ring 320 is positioned by using set screws and bolts to ensure the uniformity and non-deformability of the cavity width, meeting the forging requirements of various types of ring parts, realizing online stepless adjustment, and accurately adjusting according to the cross-sectional width requirements of different ring parts to improve the product forming rate.

[0031] Specifically, the support ring 320 is circumferentially spaced with a set screw adjustment assembly 340 for pressing against the side wall of the pressure roller body 300, and circumferentially spaced with a bolt positioning assembly 350 for threaded connection to the side wall of the pressure roller body 300. The set screw adjustment assembly 340 in this application is used to adjust the width of the positioning cavity, and the bolt positioning assembly 350, which is sequentially staggered with the set screw adjustment assembly 340, is used to position the width of the cavity, so that after the cavity width between the side ring 301 and the retaining ring 310 is formed, it has a balanced positioning performance.

[0032] The support ring 320 includes a platform portion 321, a first bent portion 322, and a second bent portion 323. The first bent portion 322 is connected to the upper part of the first end of the platform portion 321, forming a right-angled L-shape, and the second bent portion 323 is connected to the lower part of the second end of the platform portion 321, also forming a right-angled L-shape. The first bent portion 322 is connected to a retaining ring 310 via bolts 330. A set screw adjustment assembly 340 and a bolt positioning assembly 350 are staggered and assembled on the second bent portion 323 to maintain a balanced positioning adjustment. The first bent portion 322, the second bent portion 323, and the platform portion 321 are integrally formed into a ring-shaped body. Installation performance is stable and reliable.

[0033] In one specific embodiment of this application, the retaining ring 310 and the side ring 301 form a steplessly adjustable cavity with a set width range W. The set width range W is 30mm~120mm. This reduces mold manufacturing costs and meets the production needs of various types of ring parts. Of course, it should be noted that the cross-sectional width of the produced ring parts varies depending on the assembly requirements of different models of ring rolling mills, and the maximum value of the set range W can be greater than 120mm, which will not be elaborated further here.

[0034] In this embodiment, the set screw adjustment assembly 340 includes at least six set screws equidistantly spaced along the circumference of the second bend 323; and the set screw stroke S1 of each set screw is equal to (W - W1), where W1 represents the initial cavity width of the steplessly adjustable cavity. By employing set screw adjustment, stepless width adjustment is achieved, which can accommodate the processing of various types of ring parts. When six set screws are provided, the six set screws are equidistantly spaced along the circumference of the second bend 323.

[0035] The bolt positioning assembly 350 includes at least six locking bolts equidistantly spaced along the circumference of the second bend 323; and the locking stroke S2 ​​of each locking bolt is greater than or equal to (W - W1). This achieves positioning after width adjustment, maintaining adjustment balance. When six locking bolts are provided, they are equidistantly distributed along the circumference of the second bend 323, and each locking bolt corresponds to one of the six set screws in a staggered arrangement to maintain balanced positioning during width adjustment.

[0036] For example, when processing a ring with a cross-sectional width of 50mm, the initial cavity width W1 is 30mm when the set screw is in contact with the side wall of the pressure roller body 300 without applying pre-force. In this case, the set screw stroke S1 of the set screw needs to be adjusted by 20mm to meet the processing width requirement of 50mm between the side ring 301 and the retaining ring 310.

[0037] Specifically, based on the dimensions of the ring forging product, firstly, a suitable cavity depth mold is selected and installed in place, and then online adjustment is performed according to the product width. For example, if the ring product width is 50mm and the initial cavity width W1 is 30mm, then the mold cavity width needs to be adjusted to 50mm. First, the six locking bolts are loosened alternately, with a loosening stroke greater than 20mm. Then, the six set screws are tightened alternately, with a tightening stroke of 20mm. The set screws will move the support ring 320 and the retaining ring 310 to the opposite side ring 301 by 20mm. After measuring the cavity width as 50mm with a measuring tool, the six locking bolts are tightened to apply preload, ultimately adjusting the cavity width from 30mm to 50mm online. This process does not require disassembling the mold and can be operated using an electric or pneumatic wrench, enabling rapid online adjustment of the mold cavity width. Of course, it should be noted that when the ring cross-sectional width is 52.5mm, 53.8mm, or many other special and precise values, the online adjustment mold described in this application can also be precisely adjusted, which will not be elaborated further here.

[0038] In this application, the distance between the retaining ring 310 and the side ring 301 is adjusted by the set screw adjustment component 340, thereby realizing the adjustment of the cavity width during the stepless adjustment process. This satisfies the online adjustment of various types of ring parts, reduces the process of disassembling and replacing the mold, and reduces the wear on the main shaft 400 during replacement. Through the locking and positioning of the bolt positioning component 350, the width of the cavity is accurately positioned for stepless adjustment. The adjustment method is simple and reliable, reducing the mold manufacturing cost and improving the efficiency of online adjustment.

[0039] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification, which are not provided in detail for the sake of brevity.

[0040] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections for other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0041] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. An online adjustable mold for a ring rolling mill, comprising an adjustable mold mounted on the main shaft of the ring rolling mill; characterized in that, The adjusting mold includes: a pressure roller body, and an adjusting assembly that is slidably connected to and lockable onto the pressure roller body; wherein... The pressure roller body is provided with a side ring on the side close to the ring rolling mill, and the pressure roller body is provided with a first step and a second step in a stepped manner; The adjustment component includes: a retaining ring that slides on the first step and a support ring that slides on the second step; The retaining ring and the supporting ring are detachably fixedly connected; The support ring is circumferentially fitted with a set screw adjustment assembly for pressing against the side wall of the pressure roller body, and circumferentially fitted with a bolt positioning assembly for threaded connection to the side wall of the pressure roller body. The distance between the retaining ring and the side ring forms a steplessly adjustable cavity with a set width range W.

2. The online adjustable mold cavity applied to a ring rolling mill according to claim 1, characterized in that, The center of the pressure roller body is provided with a mounting hole that is compatible with the main shaft.

3. The online adjustable mold cavity applied to a ring rolling mill according to claim 2, characterized in that, The pressure roller body is connected to the main shaft via a clamping ring. The clamping ring has a chamfer that matches the mounting hole, and a locking bolt threaded to the main shaft is fitted on the clamping ring.

4. The online adjustable mold cavity applied to a ring rolling mill according to claim 1, characterized in that, The first step portion is higher than the second step portion, and the support ring and the retaining ring are connected by bolts.

5. The online adjustable mold cavity applied to a ring rolling mill according to claim 4, characterized in that, The support ring includes: a platform portion, a first bent portion, and a second bent portion; wherein, The first bent portion is connected to the upper part of the first end of the platform portion, and the second bent portion is connected to the lower part of the second end of the platform portion; The first bent portion is connected to the retaining ring by bolts; The second bending section is misaligned and equipped with the set screw adjustment assembly and the bolt positioning assembly.

6. The online adjustable mold for a ring rolling mill according to claim 5, characterized in that, The first bending portion, the second bending portion, and the platform portion are integrally formed into a ring-shaped body.

7. The online adjustable mold cavity applied to a ring rolling mill according to claim 5, characterized in that, The set screw adjustment assembly includes at least six set screws that are equidistantly spaced along the circumference of the second bend. Furthermore, the set screw stroke S1 of each set screw component is equal to (W - W1), where W1 represents the initial cavity width of the continuously adjustable cavity.

8. The online adjustable mold for a ring rolling mill according to claim 7, characterized in that, The bolt positioning assembly includes at least six locking bolts that are equidistantly spaced along the circumference of the second bend. And the locking stroke S2 ​​of each locking bolt is greater than or equal to (W - W1).

9. The online adjustable mold cavity for a ring rolling mill according to any one of claims 1 to 8, characterized in that, The specified width range W is 30mm~120mm.

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