Combined mandrel for horizontal ring rolling machine

Abstract

The utility model discloses a combined mandrel for a horizontal ring rolling machine, which relates to the technical field of ring rolling machines and comprises a mandrel, a snap ring and a core roller. A groove is formed in the middle of the periphery of the upper section of the core shaft, and the lower part of the periphery of the core shaft is sleeved with a core roller die; the clamping ring is a ring body with a middle hole formed by two semi-ring bodies, the inner wall of the middle hole of the ring body is sleeved on the bottom surface of a groove formed in the middle of the upper section of the mandrel, and the inner side of the end surface of the lower end of the ring body is tightly attached to the side wall below the groove formed in the middle of the upper section of the mandrel; the core roller die is an annular metal ring sleeve which is sleeved below the upper section of the core shaft, the lower end of the core roller die abuts against the upper end of the annular protruding table, and the side face of the outer side of an annular metal ring comprises a profiling section provided with a plurality of annular protrusions or annular protruding blocks; the ring rolling machine core shaft has the advantages that the time for replacing the core roller die of the ring rolling machine core shaft is shortened, unnecessary replacement of a linear section core roller die and a profiling section core roller die is omitted, and manpower and labor cost are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ring rolling machine technical field, and specifically is a combined mandrel for horizontal ring rolling machine. BACKGROUND

[0002] The existing horizontal ring rolling machine is limited to expanding the inner diameter and height of the ring blank hot piece through the cooperation between the main roller and the core roller, and it is difficult to consider the modeling of the inner side wall of the hole in the ring blank itself, so that the ring blank hot piece is cooled and then cold worked, including vertical lathe machining to cause a large machining allowance, thereby not helping to improve the machining efficiency and reduce the cost.

[0003] In addition, at present, the ring pieces rolled by the large radial axial ring rolling machine are mostly rectangular sections, and the hole inner diameter of some ring blank is a ring blank rolled by profiling, and the process sequence is to first use the straight face core roller die of the core shaft sleeve in the core shaft structure to roll the inner wall of the hole of the ring blank, and then the core shaft is disassembled as a whole to replace the profiling core roller die to roll the ring piece for the second time, but the core roller die is replaced for a long time in the core shaft of the ring rolling machine equipment, and with the long storage time of the ring blank hot piece itself, the temperature decreases and the hardness increases, so that the profiling of the ring inner diameter is difficult to realize the rolling forming, and further waste time and labor cost. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a combined mandrel for horizontal ring rolling machine to solve the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] The application discloses a combined mandrel for horizontal ring rolling machine, which comprises a mandrel, a snap ring and a core roller. The mandrel is a cylinder arranged in the up-down direction. The mandrel is divided into an upper mandrel section and a lower mandrel section. The upper end of the upper mandrel section is inserted into the lower part of the core mandrel box structure connected with the upper support plate of the ring rolling machine. A groove is arranged in the circumferential direction of the outer periphery of the middle part of the upper mandrel section. A core roller mold is sleeved on the lower part of the outer periphery of the upper end of the upper mandrel section. The snap ring is a ring body with a middle hole composed of two half ring bodies. The contact end between the two half ring bodies is connected by a bolt structure. The inner wall of the middle hole of the ring body is sleeved on the bottom surface of the groove arranged in the middle part of the upper mandrel section. The inner side of the lower end surface of the ring body is tightly attached to the sidewall below the groove arranged in the middle part of the upper mandrel section. The outer side of the lower end surface of the ring body is tightly attached to the upper end of the core roller mold. The lower end of the ring body is connected with the upper end of the core roller mold by a bolt structure. The inner side of the upper end of the ring body is tightly attached to the sidewall above the groove of the mandrel. The outer diameter of the shaft body above the groove and the outer diameter of the shaft body below the groove of the upper mandrel section are both smaller than the outer diameter of the ring body of the snap ring. The core roller mold is an annular metal ring sleeve. The inner side of the middle hole of the annular metal ring sleeve is sleeved below the upper mandrel section. The outer side of the annular metal ring is divided into two sections in the up-down direction. The upper section is a profiling section, and the lower section is a straight section. A plurality of annular protrusions or annular protrusions are arranged in the circumferential direction of the profiling section from top to bottom. The outer diameter of the profiling section of the annular metal ring of the core roller mold is larger than the outer diameter of the straight section of the annular metal ring. The outer diameter of the straight section of the annular metal ring is not smaller than the outer diameter of the snap ring. The lower end of the core roller mold sleeved on the outer periphery of the shaft body below the upper mandrel section is tightly attached to the upper end surface of the lower end of the upper mandrel section. The outer diameter of the upper part of the lower mandrel section is larger than the outer diameter of the lower part of the lower mandrel section. The outer diameter of the upper part of the lower end of the mandrel is the same as the outer diameter of the straight section of the annular metal ring of the core roller mold. A bolt hole is arranged in the middle part of the upper end of the upper mandrel section.

[0007] The outer side of the shaft body adjacent to the upper part of the groove is provided with external threads. The outer diameter of the shaft body provided with external threads is the same as the outer diameter of the shaft body below the groove. The upper end of the shaft body provided with external threads is fixedly connected with the lower end of the shaft body provided with flat areas on the front and back sides. The outer diameter of the shaft body provided with flat areas is smaller than the outer diameter of the shaft body provided with external threads. The shaft body provided with external threads of the upper mandrel section is coaxial with the shaft body below the groove of the upper mandrel section and the shaft body provided with flat areas on the two sides. A through hole is arranged between the two flat areas of the shaft body provided with flat areas. The through hole passes through the central axis inside the upper mandrel section. The bolt hole arranged in the middle part of the upper end of the upper mandrel section is a bolt hole arranged in the middle part of the upper end of the shaft body provided with flat areas on the two sides of the upper mandrel section.

[0008] The upper section of the mandrel is provided with a plane area section on both sides of the upper section of the mandrel, and a threaded section is provided on the outer side of the shaft body of the upper section of the mandrel; both shaft bodies are located in the structure of the mandrel, specifically, below the internal cavity of the mandrel sliding sleeve which is sleeved in the mandrel box; the through holes are symmetrically provided below the mandrel sliding sleeve, the through holes on both sides of the mandrel sliding sleeve are located on the openings on the side wall below the internal cavity of the mandrel sliding sleeve, and the openings at both ends of the through holes on the shaft body with the plane area section on both sides of the upper section of the mandrel are aligned; the threaded holes are provided on the hole walls of the through holes on both sides of the mandrel sliding sleeve, and a threaded column is inserted into the through hole on the other side of the mandrel sliding sleeve through the through hole on one side of the mandrel sliding sleeve and the through hole on the shaft body with the plane area section on both sides of the upper section of the mandrel.

[0009] The bolt hole one is extended upward along the central axis of the upper section of the mandrel, and the top of the bolt hole is located in the internal cavity of the shaft body with the threaded section on the periphery of the upper section of the mandrel; the groove is arranged in the circumferential direction of the upper section of the mandrel, the bolt hole two is arranged in the horizontal direction between the bottom surfaces of the circumferential grooves, and the bolt hole two passes through the central axis of the upper section of the mandrel.

[0010] The bolt column one is upwardly inserted into the bolt hole one arranged in the middle of the upper end of the lower section of the mandrel, the bolt hole three is arranged between the upper end of the bolt column, and the bolt hole three corresponds to the bolt hole two; the bolt column two is inserted into the bolt hole two on one side of the groove bottom surface of the upper section of the mandrel through the bolt hole three arranged between the upper end of the bolt column one, and then inserted into the bolt hole two on the other side of the groove bottom surface of the upper section of the mandrel for fixation.

[0011] The bolt hole four is arranged between the two sides of the ring body of the clamping ring, the bolt hole four intersects with and penetrates the middle hole of the ring body, and the bolt hole four is located at the middle position of the half ring body; a plurality of through holes are arranged on the end face of the half ring body, the lower end of each through hole corresponds to the threaded hole arranged on the upper end of the core roller mold, and the screw is inserted into the threaded hole on the upper end of the core roller mold through the through hole of the half ring body.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The inner diameter of the hole in the ring blank is shaped by rolling, the outer side of the core roller die is designed in two sections, the upper section of the outer side of the core roller die is a profiling section, and the lower section of the outer side of the core roller die is a straight section; in actual production, the process production sequence is as follows: first, the straight section of the core roller die is used to cooperate with the rolling ring main rolling roller and the taper roller to roll the inner wall of the hole in the ring blank, the outer side wall of the ring blank and the upper and lower ends, then when the inner and outer diameters of the ring blank and the height of the ring blank reach the process requirements, the core shaft of the rolling ring machine moves down under the control of the hydraulic lifting device, reaches the core roller double-station profiling section, and further rolls the inner wall of the hole in the ring blank, thereby realizing profiling rolling of the inner wall of the hole in the ring blank in a short time; this has the advantages that the straight section core roller die and the profiling section core roller die are combined in one core roller die from the top, thereby avoiding unnecessary replacement of the straight section core roller die and the profiling section core roller die around the core roller die on the rolling ring machine during production of the rolling ring machine, saving time, and avoiding that the ring blank is parked for too long a time due to replacement of the core roller during the rolling process, the temperature decreases, the hardness increases, the profiling rolling forming of the inner diameter of the hole in the ring blank consumes more kinetic energy, and time and labor costs are wasted;

[0014] 2. In the case that different profiling rolling dies are used for different inner diameters and types of ring blanks and the core roller die on the core shaft must be replaced, the core shaft upper section and the core shaft lower section are separated, the old core roller die is smoothly removed, and a new core roller die is sleeved on the lower section of the core roller, thereby avoiding that the core shaft must be completely disassembled and the core roller die must be installed again due to replacement of the core roller die, greatly reducing the core roller die replacement time and saving labor costs. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a disassembled structure diagram of the combined core shaft of the horizontal rolling ring machine;

[0016] Figure 2 It is a core roller die structure diagram of the combined core shaft of the horizontal rolling ring machine;

[0017] Figure 3 It is a clamping ring structure diagram of the combined core shaft of the horizontal rolling ring machine;

[0018] Figure 4 It is a core shaft upper section structure diagram of the combined core shaft of the horizontal rolling ring machine;

[0019] Figure 5 It is a core shaft lower section structure diagram of the combined core shaft of the horizontal rolling ring machine.

[0020] In the figure: 1, the upper section of the mandrel; 101, bolt hole two; 102, the section of the shaft body with external threads; 103, the section of the shaft body with flat areas on both sides; 104, bolt hole one; 105, bolt hole five; 106, a through round hole; 2, a snap ring; 201, a half ring body; 202, bolt hole four; 3, a core roller mold; 301, a straight section; 302, a profiling section; 4, the lower section of the mandrel; 401, bolt column one; 402, bolt hole three; 5, bolt column two. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Please refer to the legend, the utility model discloses a combined mandrel for horizontal ring rolling machine, including mandrel, snap ring 2, core roller;The mandrel is a cylindrical body arranged along the up-down direction, and the mandrel is divided into the upper section 1 of mandrel and the lower section 4 of mandrel, the upper end of the upper section 1 of mandrel is inserted into the lower part of the mandrel box structure connected with the upper support plate of ring rolling machine upwards, the middle position of the outer periphery of the upper section 1 of mandrel is provided with a groove along the circumference, and the lower part of the outer periphery of the upper end of the mandrel is provided with a core roller die 3;The snap ring 2 is a ring body with a middle hole formed by two half ring bodies 201, the contact end between the two half ring bodies 201 is connected by bolt structure, the inner wall of the middle hole of the ring body is sleeved on the bottom surface of the groove provided in the middle of the upper section 1 of mandrel, the inner side of the lower end surface of the ring body is tightly attached to the sidewall below the groove provided in the middle of the upper section 1 of mandrel, the outer side of the lower end surface of the ring body is tightly attached to the upper end of the core roller die 3, and the lower end of the ring body is connected with the upper end of the core roller die 3 by bolt structure, the inner side of the upper end of the ring body is tightly attached to the sidewall above the groove of the mandrel, the outer diameter of the shaft body above the groove of the upper section 1 of mandrel is smaller than the outer diameter of the ring body of the snap ring 2 itself;The core roller die 3 is an annular metal ring, and the inner side of the middle hole of the annular metal ring is sleeved below the upper section 1 of mandrel;The outer side of the annular metal ring is divided into two sections, the upper section is a profiling section 302, and the lower section is a straight section 301, a plurality of annular protrusions or annular bosses are arranged on the profiling section 302 along the circumference from top to bottom, the outer diameter of the profiling section 302 of the annular metal ring of the core roller die 3 itself is greater than the outer diameter of the straight section 301 of the annular metal ring, and the outer diameter of the straight section 301 of the annular metal ring is not less than the outer diameter of the snap ring 2;The lower end of the upper section 1 of mandrel is connected with the upper end of the lower section 4 of mandrel by bolt structure, the lower end of the core roller die 3 sleeved on the outer periphery of the shaft body below the upper section 1 of mandrel is tightly attached to the upper end surface of the lower section 4 of mandrel, the outer diameter of the upper part of the lower section 4 of mandrel is greater than the outer diameter of the lower part of the lower section 4 of mandrel, and the outer diameter of the upper part of the lower section 4 of mandrel is the same as the outer diameter of the straight section 301 of the annular metal ring below the core roller die 3 itself;The middle of the upper end of the upper section 1 of mandrel is provided with a bolt hole.

[0023] The outer thread is arranged on the outer side of the shaft body adjacent to the groove above the middle of the upper section 1 of mandrel, and the outer diameter of the shaft body 102 provided with the outer thread is the same as the outer diameter of the shaft body below the groove;The upper end of the shaft body 102 provided with the outer thread is fixedly connected with the lower end of the shaft body 103 provided with a planar area on two sides, and the outer diameter of the shaft body 103 provided with the planar area on two sides is smaller than the outer diameter of the shaft body 102 provided with the outer thread;The shaft body 102 provided with the outer thread of the upper section 1 of mandrel itself is coaxial with the shaft body adjacent to the lower part of the groove of the upper section 1 of mandrel and the shaft body 103 provided with the planar area on two sides, and the through hole 106 is arranged between the planar areas on two sides of the shaft body 103 provided with the planar area on two sides, and the through hole passes through the central axis in the interior of the upper section 1 of mandrel;The bolt hole provided in the middle of the upper end of the upper section 1 of mandrel is the bolt hole five 105 provided in the middle of the upper end of the shaft body 103 provided with the planar area on two sides of the upper section 1 of mandrel itself.

[0024] The upper section 1 of the mandrel is provided with a section of shaft body 103 with a flat area on both sides and a section of shaft body 102 with external threads on the outer side of the shaft body of the upper section 1 of the mandrel, both of which are located in the mandrel structure, specifically below the internal cavity of the mandrel sleeve installed in the mandrel box structure; wherein the section of shaft body 103 with a flat area on both sides of the upper section 1 of the mandrel is connected with the mandrel sleeve of the ring rolling machine, the section of shaft body with external threads on the outer side of the shaft body of the upper section 1 of the mandrel is a T-shaped thread, which is used for thread cooperation with the screw sleeve on the ring rolling machine, and relative movement between the two during use achieves the purpose of micro movement in the axial direction of the mandrel; the through holes on both sides of the lower section of the mandrel sleeve are located on the openings on the side wall below the internal cavity of the mandrel sleeve, and the through holes on both sides of the mandrel sleeve are aligned with the opening positions of the through holes on both sides of the section of shaft body 103 with a flat area on both sides of the upper section 1 of the mandrel; the hole walls of the through holes on both sides of the mandrel sleeve are provided with internal threads, and a threaded column is inserted into the through hole on the other side of the mandrel sleeve through the through hole on one side of the mandrel sleeve and the through hole on the section of shaft body with a flat area on both sides of the upper section 1 of the mandrel to be fixed.

[0025] A bolt hole one 104 is provided in the middle of the end face of the lower end of the upper section 1 of the mandrel, the bolt hole one 104 extends upward along the central axis of the upper section 1 of the mandrel, and the top of the bolt hole one 104 is located inside the section of shaft body 102 with external threads provided on the periphery of the upper section 1 of the mandrel; a groove is provided along the circumference of the middle of the upper section 1 of the mandrel, a bolt hole two 101 is provided between the bottom surfaces of the circumferential grooves in the horizontal direction, and the bolt hole two 101 passes through the central axis of the upper section 1 of the mandrel; the bolt hole one 104 provided in the upward and downward direction intersects and penetrates the bolt hole two 101 provided in the horizontal direction.

[0026] An upward bolt column one 401 is provided in the middle of the upper end of the lower section 4 of the mandrel, the bolt column one 401 is inserted into the bolt hole one 104 provided in the middle of the lower end of the upper section 1 of the mandrel, bolt hole three 402 is provided between the upper ends of the bolt column one 401, and the bolt hole three 402 corresponds to the bolt hole two 101; after one end of the bolt column two 5 is inserted into the bolt hole two 101 on one side of the groove bottom surface of the middle of the upper section 1 of the mandrel, the bolt column two 5 passes through the bolt hole three 402 on the upper end of the bolt column one 401, and is inserted into the bolt hole two 101 on the other side of the groove bottom surface of the upper section 1 of the mandrel for fixation.

[0027] The clamping ring 2 is provided with a through bolt hole four 202 between the two sides of the ring body, the bolt hole four 202 intersects and penetrates the middle hole of the ring body, and the bolt hole four 202 is located in the middle position of the half ring body 201; a plurality of through holes are provided on the end face of the half ring body 201, the lower end of each through hole corresponds to the threaded hole provided on the upper end of the core roller die 3, and the screw is inserted into the threaded hole on the upper end of the core roller die 3 through the through hole of the half ring body 201.

[0028] The working principle of the utility model is: the utility model adopts different profiling rolling manufacturing types according to different ring piece blank inner diameters and types, and under the condition that the core roller die 3 sleeved on the mandrel must be replaced, the old core roller die 3 can be smoothly removed through the mode of separating the upper mandrel section 1 and the lower mandrel section 4, and the new core roller die 3 is sleeved below the upper core roller section, avoiding that the mandrel must be completely disassembled and the core roller die 3 is installed again due to the replacement of the core roller die 3, thereby greatly reducing the replacement of the core roller die 3 and saving the labor cost.

[0029] But on the other hand, in the specific production, the utility model divides the outer side of the core roller die 3 into two sections, the upper section of the outer side of the core roller die 3 is a profiling section 302, and the lower section of the core roller die 3 is a straight section 301; the advantage of this is that the core roller die 3 of the straight section 301 and the core roller die 3 of the profiling section 302 are combined in a core roller die 3, thereby avoiding the unnecessary replacement of the core roller die 3 of the straight section 301 and the core roller die 3 of the profiling section 302 on the ring rolling machine in the working production of the ring rolling machine, saving time and reducing the waste of labor cost; the specific working steps are that the process production sequence is that the hole inner wall of the ring piece blank, the outer wall and the upper and lower two ends of the ring piece blank are rolled by the core roller one station straight section matched with the ring rolling main roller and the taper roller, then after the inner and outer diameters of the ring piece blank hot piece and the height of the ring piece blank reach the process requirements, the mandrel of the ring rolling machine moves downward under the control of the hydraulic lifting device, reaches the core roller double station profiling section 302, and further rolls the hole inner wall of the ring piece blank hot piece, thereby realizing the profiling rolling of the hole inner wall of the ring piece blank hot piece in a shorter time.

[0030] The above is only the preferable specific implementation mode of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model makes equivalent replacement or change, should be covered in the protection scope of the utility model.

Claims

1. A combined mandrel for horizontal ring rolling machines, characterized in that: The application relates to a core shaft, a snap ring and a core roller, wherein the core shaft is a cylinder arranged in the up-down direction; the core shaft is divided into an upper core shaft section and a lower core shaft section; the upper end of the upper core shaft section is inserted into the lower part of a core shaft box structure connected to an upper support plate of a ring rolling machine; a groove is arranged on the outer periphery of the middle part of the upper core shaft section in the circumferential direction; and a core roller die is sleeved on the lower part of the outer periphery of the upper core shaft section; the snap ring is a ring body with a middle hole composed of two half ring bodies; the contact ends between the two half ring bodies are connected through a bolt structure; the inner wall of the middle hole of the ring body is sleeved on the bottom surface of the groove arranged in the middle part of the upper core shaft section; the inner side of the lower end surface of the ring body is tightly attached to the sidewall below the groove arranged in the middle part of the upper core shaft section; the outer side of the lower end surface of the ring body is tightly attached to the upper end of the core roller die; the upper end inner side of the ring body is tightly attached to the sidewall above the groove of the core shaft; the outer diameters of the shaft bodies above and below the groove of the upper core shaft section are smaller than the outer diameter of the ring body of the snap ring; the core roller die is an annular metal ring sleeve; the inner side of the middle hole of the annular metal ring sleeve is sleeved on the lower part of the upper core shaft section; the outer side of the annular metal ring is divided into two sections in the up-down direction; the upper section is a profiling section; the lower section is a straight section; a plurality of annular protrusions or annular protruding blocks are arranged on the profiling section in the circumferential direction from top to bottom; the outer diameter of the profiling section of the annular metal ring of the core roller die is larger than the outer diameter of the straight section of the annular metal ring; the outer diameter of the straight section of the annular metal ring is not smaller than the outer diameter of the snap ring; the lower end of the core roller die sleeved on the outer periphery of the shaft body below the upper core shaft section is tightly attached to the upper end surface of the lower end of the core shaft; the outer diameter of the upper part of the lower core shaft section is larger than the outer diameter of the lower part of the lower core shaft section; the outer diameter of the lower straight section of the annular metal ring of the core roller die is the same as the outer diameter of the upper part of the lower core shaft section; a bolt hole is arranged in the middle part of the upper end of the upper core shaft section.

2. The combined mandrel for horizontal ring rolling machine according to claim 1, characterized in that: An outer thread is arranged on the outer side of the shaft body adjacent to the upper part of the groove arranged in the middle part of the upper core shaft section; the outer diameter of the shaft body provided with the outer thread is the same as the outer diameter of the shaft body adjacent to the lower part of the groove; the upper end of the shaft body provided with the outer thread is fixedly connected with the lower end of the shaft body provided with a planar area on the two sides; the outer diameter of the shaft body provided with the planar area on the two sides is smaller than the outer diameter of the shaft body provided with the outer thread; the shaft body provided with the outer thread of the upper core shaft section is coaxial with the shaft body adjacent to the lower part of the groove of the upper core shaft section and the shaft body provided with the planar area on the two sides; a through hole is arranged between the planar areas on the two sides of the shaft body provided with the planar area on the two sides; the through hole passes through the central axis in the upper core shaft section; the bolt hole arranged in the middle part of the upper end of the upper core shaft section is a bolt hole arranged in the middle part of the upper end of the shaft body provided with the planar area on the two sides of the upper core shaft section.

3. The combined mandrel for horizontal ring rolling machine according to claim 2, characterized in that: The upper section of the mandrel is provided with a plane area section on both sides, and a threaded section is provided on the outer side of the shaft body of the upper section of the mandrel; both shaft bodies are located in the mandrel structure, specifically below the inner cavity of the mandrel sleeve which is sleeved in the mandrel box structure; the through holes are symmetrically provided below the mandrel sleeve, and the through holes on both sides of the mandrel sleeve are located on the openings on the side wall below the inner cavity of the mandrel sleeve, and are respectively aligned with the opening positions of the through holes on both sides of the shaft body of the upper section of the mandrel; the inner thread is provided on the hole wall of the through hole on both sides of the mandrel sleeve, and a threaded column is inserted into the through hole on the other side of the mandrel sleeve through the through hole on one side of the mandrel sleeve and the through hole on the shaft body of the upper section of the mandrel.

4. The combined mandrel for horizontal ring rolling machine according to claim 1, characterized in that: A bolt hole one is provided in the middle of the end face of the lower end of the upper section of the mandrel, the bolt hole one extends upward along the central axis of the upper section of the mandrel, and the top of the bolt hole is located in the inner part of the shaft body provided with a threaded section on the periphery of the upper section of the mandrel; a groove is arranged along the circumference of the middle part of the upper section of the mandrel, a bolt hole two is provided between the bottom surfaces of the circumferential grooves in the horizontal direction, and the bolt hole two passes through the central axis of the upper section of the mandrel; the bolt hole one is intersected and penetrated by the bolt hole two which is provided in the horizontal direction.

5. The combination mandrel for use in a horizontal ring rolling machine as defined in claim 1, wherein: The upper end of the lower section of the mandrel is provided with an upward bolt column one, the bolt column one is inserted into the bolt hole one provided in the middle of the lower end of the upper section of the mandrel, a bolt hole three is provided between the upper end of the bolt column, and the bolt hole three corresponds to the position of the bolt hole two; after one end of the bolt column two is inserted into the opening of the bolt hole two on one side of the groove bottom surface of the middle part of the upper section of the mandrel, the bolt column two is fixed by passing through the bolt hole three provided between the upper end of the bolt column one and being inserted into the bolt hole two on the other side of the groove bottom surface of the upper section of the mandrel.

6. The combination mandrel for a horizontal ring rolling machine of claim 1 wherein: The bolt hole four is provided between the two sides of the ring body of the clamping ring, the bolt hole four intersects and penetrates the middle hole of the ring body, and the bolt hole four is located in the middle position of the half ring body; a plurality of through holes are provided on the end face of the half ring body, and the lower end of each through hole corresponds to the threaded hole provided on the upper end of the core roller mold; after the screw passes through the through hole of the half ring body, the screw is inserted into the threaded hole on the upper end of the core roller mold.

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