CN112828235A - Forming process and forming system of inner multi-tooth bolt - Google Patents
Forming process and forming system of inner multi-tooth bolt Download PDFInfo
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- CN112828235A CN112828235A CN202110010084.7A CN202110010084A CN112828235A CN 112828235 A CN112828235 A CN 112828235A CN 202110010084 A CN202110010084 A CN 202110010084A CN 112828235 A CN112828235 A CN 112828235A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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Abstract
The application relates to the technical field of cold heading forming, in particular to a forming process of an inner multi-tooth bolt and a forming system of the inner multi-tooth bolt, wherein the forming process of the inner multi-tooth bolt comprises the following steps: carrying out backward extrusion operation on the preformed bolt with the formed pit at the head part to form an inner polygon; and (4) upsetting the preformed bolt with the head part formed with the inner polygon to form a final product. The process is different from the traditional technology, the backward extrusion forming process and the heading process are separated, the four-station punch reversely extrudes the inner polygon, the punch is only subjected to longitudinal extrusion force, the service life of the punch is greatly prolonged, the five-station punch only carries out heading operation, the punch in the five stations only plays a supporting role, the stress is small, the punch is not easy to break, the service life of the punch is greatly prolonged, in addition, the separation of the two processes also avoids the risk of turning over of the preformed blank caused by a deep drawing hole part, and the yield is improved.
Description
Technical Field
The application relates to the technical field of cold heading forming, in particular to a forming process of an inner multi-tooth bolt and a forming system of the inner multi-tooth bolt.
Background
In the conventional process of forming the internal multi-tooth bolt, the internal multi-angle and the heading of the bolt are reversely extruded in the same process, so as to form a final product, wherein a four-station punch shown in fig. 1 is used for reversely extruding a bolt blank to perform operations of presetting an angle and synchronously heading (the four-station punch comprises a punch and a punch), however, the forming process has the following problems: for a product which is internally multi-tooth, deep, thin-walled and simultaneously has a large and thin head diameter, the metal flow is limited during upsetting, so that the punch is subjected to large extrusion force in the longitudinal direction and the transverse direction, the service life of the product is rapidly reduced, the average service life of the product is less than 500 pieces in the current production, in addition, the head of the part is gradually formed in the backward extrusion process, when the backward extrusion punch works to a certain depth, a metal deformation dead zone is easily formed at the position R below the head, and because of the thin-walled piece, if the inner angle depth is continuously deepened, the continuity of a metal streamline at the position of the thin wall below the head is easily damaged, and the risk of part turning around occurs. Therefore, in view of the above problems, there is a high necessity for a forming process that is effective in extending the life of the punch and improving the yield.
Disclosure of Invention
The application aims to provide a forming process of an inner multi-tooth bolt and a forming system of the inner multi-tooth bolt, and solves the technical problem that the forming process which can effectively prolong the service life of a punch and improve the yield is urgently needed in the prior art to a certain extent.
The application provides a forming process of an inner multi-tooth bolt, which comprises the following steps:
carrying out backward extrusion operation on the preformed bolt with the formed pit at the head part to form an inner polygon;
and (4) upsetting the preformed bolt with the head part formed with the inner polygon to form a final product.
In the above technical solution, further, the orientation of the first punch used in the backward extrusion step is the same as the orientation of the preformed bolt in the backward extrusion step;
the orientation of a second punch used in the final heading step is the same as that of the preformed bolt in the final heading step;
the orientation of the preformed bolt in the backward extrusion step is kept unchanged from the orientation of the preformed bolt in the final heading step.
In any of the above technical solutions, further, before the backward extrusion operation is performed on the preformed bolt with the recess formed in the head, the method further includes the following steps:
cutting: cutting a cylindrical bar stock according to a preset size;
forward extrusion: forward extruding the bar stock to form a screw part and a threaded connecting part of a preformed bolt;
primary heading; heading the screw part of the preformed bolt to form the head part of the preformed bolt;
pre-forming pits on the head part: forming a recess in the head of the preformed bolt.
The application also provides a forming system of the inner multi-tooth bolt, and the forming process of the inner multi-tooth bolt based on any technical scheme has all beneficial technical effects of the forming process of the inner multi-tooth bolt, and is not repeated herein.
In the above technical solution, further, the backward extrusion die for the inner polygonal bolt includes: the first die comprises a first die body, a first punch and a first floating male die; part of the structure of the first floating male die is embedded in one end of the first die body;
the first punch penetrates through the first floating male die, one end of the first punch penetrates through the first floating male die and abuts against the first die body, and the other opposite end of the first punch penetrates through the first floating male die and extends to the outside of the first floating male die;
the first punch is locked on the first die body through a first fastening member embedded in the first die body; the first floating male die can move along the length direction of the first punch;
when the first floating convex die moves to a first limit position towards the preformed blank, a preset distance is reserved between the end surface of the head of the preformed blank and the end surface of the first floating convex die close to the preformed blank.
In any one of the above technical solutions, further, the die body includes a first guide member, a punch fixing member, and a punch stopper member; wherein the first guide member has a first mounting space formed therethrough at opposite ends thereof, and the punch fixing member and the punch stopper member are sequentially disposed in the first mounting space along a longitudinal direction of the first mounting space;
one end of the first floating male die is inserted into one end of the first installation space, the first floating male die abuts against the punch fixing member, and the other opposite end of the first floating male die extends to the outside of the first guide member;
the punch fixing member is provided with a second mounting space penetrating through two opposite ends of the punch fixing member, and the first punch is inserted into the second mounting space;
the punch fixing member is provided with a first mounting hole communicated with the second mounting space, the first mounting hole penetrates through the side wall of the punch fixing member, the first fastening member is arranged in the first mounting hole, and the first fastening member is in threaded connection with the side wall of the first mounting hole; the end of the first fastening member is pressed against the side wall of the first punch;
the punch fixing member and the first punch are both abutted against the punch stopper member, and the punch stopper member is connected to the first guide member by a second fastening member.
In any one of the above technical solutions, further, the heading die for the inner polygonal bolt includes: the second die comprises a second die body, a second punch and a second floating male die; part of the structure of the second floating male die is embedded in one end of the second die body;
the second punch penetrates through the second floating male die, one end of the second punch penetrates through the second floating male die and abuts against the second die body, and the other opposite end of the second punch penetrates through the second floating male die and extends to the outside of the second floating male die;
the second punch is locked on the second die body through a locking component embedded in the second die body; the second floating punch is movable along the length of the second punch to perform a heading operation on the preform.
In any of the above technical solutions, further, the second mold body includes a second guide member, the second guide member is provided with a first installation cavity, a second installation cavity and a third installation cavity which are sequentially communicated, the first installation cavity penetrates through one end of the second guide member, and the third installation cavity penetrates through the opposite other end of the second guide member;
part of the structure of the floating male die is inserted into the third mounting cavity, and part of the structure of the second punch is inserted into the second mounting cavity; the second guide member is also provided with a first mounting hole communicated with the second mounting cavity and the outside, the locking member is arranged in the first mounting hole, and the locking member is in threaded connection with the side wall of the first mounting hole; the end of the locking member is pressed against the side wall of the second punch.
In any one of the above technical solutions, the die body further includes a first stopper member and a mounting member sequentially disposed in the second mounting cavity, and the first stopper member is disposed close to the second punch;
the first limiting component is provided with a second mounting hole penetrating through two sides of the first limiting component, an elastic assembly is arranged in the second mounting hole and comprises an elastic component, a force application component and a second limiting component, and the elastic component is arranged in the second mounting hole;
the first limiting member is provided with a third mounting hole, the third mounting hole penetrates through the side wall of the first limiting member, and the second limiting member is inserted into the third mounting hole; the second stopper member, the elastic member, the urging member, and the second punch are sequentially abutted along a longitudinal direction of the second punch;
and before the pre-formed blank heading is formed, the force application component pushes the second punch to be away from the end part of the second installation space, close to the first installation space, by a preset distance.
In any of the above technical solutions, further, the forming system of the inner multi-tooth bolt further includes a manipulator device and a cutting device; the manipulator device is used for conveying preformed blanks between different stations in the multi-station cold heading equipment; the cutting device is used for cutting out a bar stock with a preset size.
Compared with the prior art, the beneficial effect of this application is:
the forming process of the inner multi-tooth bolt is different from the traditional technology, the reverse extrusion forming process and the heading process are separated, the four-station punch reversely extrudes inner polygons, the punch only bears longitudinal extrusion force at the moment, the service life of the punch can be greatly prolonged, the five-station punch only carries out heading operation, the punch only plays a supporting role in five stations, the stress is small, the punch is not prone to fracture, the service life of the punch can be greatly prolonged, in addition, the two processes are separated, the risk that a preformed blank caused by a deep drawing hole part turns around is avoided, and the yield is improved. Therefore, the forming process of the inner multi-tooth bolt effectively solves the problems that in the prior art, the service life of a punch is short and the bolt is easy to turn around.
The forming system of interior multiple tooth bolt that this application provided can realize that the technology of multiangle separates mutually with the technology of heading in the backward extrusion bolt, helps prolonging the life of drift and improves the yield.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a forming process for an inner multi-tooth bolt provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a backward extrusion die for an inner polygonal bolt according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an upset head die of an inner polygonal bolt provided in an embodiment of the present application.
Reference numerals:
1-backward extrusion die of inner polygonal bolt, 11-first die body, 111-first guide member, 112-fixing member for punch, 113-limiting member for punch, 12-first punch, 13-first fastening member, 14-first floating male die, 15-second fastening member, 2-heading die of inner polygonal bolt, 21-second die body, 211-second guide member, 212-first limiting member, 213-mounting member, 214-elastic component, 2141-elastic member, 2142-force applying member, 2143-second limiting member, 22-second punch, 23-second floating male die, 24-locking member, 3-preformed blank.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
A process for forming an inner multi-tooth bolt and a system for forming an inner multi-tooth bolt according to some embodiments of the present application will be described with reference to fig. 1 to 3.
Example one
Referring to fig. 1, an embodiment of the present application provides a forming process of an inner multi-tooth bolt, including the steps of:
carrying out backward extrusion operation on the preformed bolt with the formed pit at the head part to form an inner polygon;
and (4) upsetting the preformed bolt with the head part formed with the inner polygon to form a final product.
The forming process of the inner multi-tooth bolt is different from the traditional technology, but the backward extrusion forming process and the heading process are separated from each other, a four-station punch reversely extrudes inner polygons, at the moment, the punch is only subjected to longitudinal extrusion force, the service life of the punch is greatly prolonged, a five-station punch only carries out heading operation, the punch in five stations only plays a supporting role, the stress is small, the punch is not easy to break, and the service life of the punch is greatly prolonged. In addition, the two processes are separated, so that the risk of turning around of the preformed blank caused by deep drawing of the hole part can be avoided, and the yield is improved.
According to the content, the forming process of the inner multi-tooth bolt can effectively solve the problems that in the prior art, the service life of a punch is short and the bolt is easy to turn around.
In this embodiment, preferably, the first punch orientation used in the backward extrusion step is the same as the orientation of the preformed bolt in the backward extrusion step;
the orientation of a second punch used in the final heading step is the same as that of the preformed bolt in the final heading step;
the orientation of the preformed bolt in the backward extrusion step is kept unchanged from the orientation of the preformed bolt in the final heading step.
According to the above description, a continuous production is realized without adding a positioning step between the two processes, and the production efficiency is improved.
Further, it is preferable that, as shown in fig. 1, before the backward extrusion operation is performed on the preformed bolt with the dimple formed on the head, the method further includes the following steps:
cutting: cutting a cylindrical bar stock according to a preset size;
forward extrusion: carrying out forward extrusion on the bar stock to form a screw part and a threaded connecting part of the preformed bolt;
primary heading; upsetting the screw part of the preformed bolt to form the head part of the preformed bolt;
pre-forming pits on the head part: a recess is formed in the head of the preformed bolt.
The preformed blank processed by the process can be subjected to a forming process of backward extrusion inner polygon and heading.
In summary, referring to fig. 1, the forming process of the inner multi-tooth bolt comprises the following steps:
cutting: cutting a cylindrical bar stock according to a preset size;
forward extrusion: carrying out forward extrusion on the bar stock to form a screw part and a threaded connecting part of the preformed bolt;
primary heading; upsetting the screw part of the preformed bolt to form the head part of the preformed bolt;
pre-forming pits on the head part: forming a concave pit on the head of the preformed bolt; carrying out backward extrusion operation on the preformed bolt with the formed pit at the head part to form an inner polygon;
and (4) upsetting the preformed bolt with the head part formed with the inner polygon to form a final product.
The process can realize the continuous production of the inner polygonal bolt, the produced bolt is not easy to break, the yield is high, and the punch involved in the process has long service life.
Example two
The embodiment of the application further provides a forming system of the inner multi-tooth bolt, and the forming process of the inner multi-tooth bolt based on any one of the embodiments is based on any one of the embodiments, so that all beneficial technical effects of the forming process of the inner multi-tooth bolt are achieved, and the details are not repeated herein.
In this embodiment, preferably, the forming system of the inner multi-tooth bolt comprises a multi-station cold heading device, wherein the multi-station cold heading device is provided with five stations along the length direction, one station is used for realizing forward extrusion, two stations are used for realizing primary heading, three stations are used for realizing head pre-pit, four stations are used for realizing inner multi-angle forming of the backward extrusion bolt, particularly inner multi-angle forming of the bolt by using a backward extrusion die 1 of the inner multi-angle bolt (shown in fig. 2), and five stations are used for realizing final heading, particularly forming by using a heading die 2 of the inner multi-angle bolt (shown in fig. 3).
According to the structure, the backward extrusion die 1 of the inner polygonal bolt is used for backward extruding the inner polygonal bolt, and the heading die 2 of the inner polygonal bolt is used for finishing the final heading operation, so that the separation of the backward extrusion inner polygonal process and the heading process is realized, the damage of a punch can be avoided, the problem of head breakage of the produced bolt can be avoided, and the yield is improved.
The detailed structure of the backward extrusion die 1 for the inner polygonal bolt and the heading die 2 for the inner polygonal bolt will be described in detail below.
In this embodiment, as shown in fig. 2, the backward extrusion die 1 for an inner polygonal bolt includes: a first die body 11, a first punch 12, and a first floating punch 14; wherein, part of the structure of the first floating male die 14 is embedded at one end of the first die body 11; the first punch 12 is arranged in the first floating punch 14 in a penetrating manner, one end of the first punch 12 penetrates through the first floating punch 14 and abuts against the first die body 11, and the other opposite end of the first punch 12 penetrates through the first floating punch 14 and extends to the outside of the first floating punch 14;
the first punch 12 is locked to the first die body 11 by a first fastening member 13 embedded in the first die body 11; the first floating punch 14 is movable along the length direction of the first punch 12;
when the first floating punch 14 is moved into the first extreme position towards the preform 3, a predetermined distance h exists between the end face of the head of the preform 3 and the end face of the first floating punch 14 adjacent to the preform 3.
According to the structure described above, after the pits of the pre-formed blank 3 are preformed at three stations, the internal polygonal of the four-station backward extrusion bolt is completed by using the backward extrusion die 1 of the internal polygonal bolt, specifically, the first die body 11 drives the first punch 12 to move towards the pre-formed blank 3 for backward extrusion forming, because when the first floating punch 14 moves towards the pre-formed blank 3 to the first limit position, that is, the first floating punch 14 is closest to the pre-formed blank 3, a preset distance is always left between the end surface of the head of the pre-formed blank 3 and the end surface of the first floating punch 14 close to the pre-formed blank 3, only the first punch 12 is in contact alignment with the pits of the pre-formed part in the process step, and then the internal polygonal of the pre-formed bolt is backward extruded, that is, only the backward extrusion operation is completed at this time, and the operation of heading is not performed, so as to prevent the circumferential direction of the first punch 12 from being, in addition, the preform 3 does not have a problem of breakage due to the simultaneous force of the reverse extrusion and the heading.
In addition, the first punch 12 is locked to the first die body 11 through the first fastening member 13 embedded in the first die body 11, so that the first punch 12 is fixed and cannot rotate, and the preformed blank 3 subjected to internal angle backward extrusion in the four stations can be directly conveyed to a heading in the five stations as long as the first punch 12 in the five stations keeps the same orientation as the first punch 12 in the four stations, so that repositioning is not needed, a possibility is provided for separating backward extrusion and heading processes in the prior art, and a possibility is provided for realizing continuous production.
In this embodiment, preferably, as shown in fig. 2, the die body includes a first guide member 111, a punch-use fixing member 112, and a punch-use stopper member 113; wherein, the first guide member 111 is formed with a first mounting space penetrating through opposite ends thereof, and the punch fixing member 112 and the punch stopper member 113 are sequentially provided in the first mounting space along a longitudinal direction of the first mounting space;
one end of the first floating punch 14 is inserted into one end of the first installation space, and the first floating punch 14 abuts against the fixing member 112 for punch, and the opposite other end of the first floating punch 14 extends to the outside of the first guide member 111;
the punch fixing member 112 has a second mounting space formed therethrough at opposite ends thereof, and the punch is inserted into the second mounting space;
the punch fixing member 112 is provided with a first mounting hole communicated with the second mounting space, the first mounting hole penetrates through the side wall of the punch fixing member 112, a first fastening member 13 is arranged in the first mounting hole, and the first fastening member 13 is in threaded connection with the side wall of the first mounting hole; the end of the first fastening member 13 is pressed against the side wall of the first punch 12;
the punch fixing member 112 and the first punch 12 are both abutted against the punch stopper member 113, and the punch stopper member 113 is connected to the first guide member 111 by a second fastening member 15.
According to the structure described above, the first punch 12, the punch fixing member 112, the punch limiting member 113 and the first guide member 111 are connected into an integral structure, the first punch 12 does not rotate, the orientation of the first punch 12 is consistent with that of the second punch 22 at five stations, continuous production is possible, and after the assembly is installed on the die holder, fine adjustment of the punch position can be achieved only by rotating the whole, which is more convenient.
In this embodiment, preferably, as shown in fig. 3, the heading die 2 for the inner polygonal bolt includes: a second die body 21, a second punch 22, and a second floating punch 23; wherein, part of the structure of the second floating male die 23 is embedded at one end of the second die body 21;
the second punch 22 is arranged through the second floating punch 23, one end of the second punch 22 penetrates through the second floating punch 23 and abuts against the second die body 21, and the other opposite end of the second punch 22 penetrates through the second floating punch 23 and extends to the outside of the second floating punch 23;
the second punch 22 is locked to the second die body 21 by a lock member 24 embedded in the second die body 21; the second floating punch 23 is movable along the length of the second punch 22 to perform a heading operation on the preform 3.
According to the above-described structure, the heading operation using the heading die 2 for the inner polygonal bolt is performed in such a manner that the preform 3 subjected to the four-station backward extrusion of the inner polygonal bolt is transferred to the fifth station, the heading die 2 for the inner polygonal bolt at the fifth station is first inserted into the inner corner of the bolt to be formed at the corresponding four station by using the plurality of teeth of the second punch 22 for positioning, and then the heading operation is performed on the preform 3 by the second floating punch 23.
It can be seen that the heading die 2 of the inner polygonal bolt can independently complete the heading operation, and provides possibility for separating the heading and the backward extrusion operation in the prior art, wherein the second punch 22 in the fifth station only plays a supporting role and is stressed less, so that the turning risk caused by deep hole drawing of the preformed blank 3 is avoided, and the second punch 22 cannot be broken due to the acting force generated by the backward extrusion and the heading at the same time.
The four-station and five-station second punch 22 is required to keep the consistent direction when the preformed blank 3 is transferred, that is, the second punch 22 does not rotate, so that the second punch 22 is locked to the die body by the locking member 24 in the application, the second punch 22 is ensured not to rotate, the rapid positioning and the rapid forming can be realized, the possibility of separating the backward extrusion and heading process in the prior art is provided, and the possibility of realizing the continuous production is provided.
Further, as shown in fig. 3, the second mold body 21 preferably includes a second guide member 211, the second guide member 211 is provided with a first mounting cavity, a second mounting cavity and a third mounting cavity which are communicated in sequence, the first mounting cavity penetrates through one end of the second guide member 211, and the third mounting cavity penetrates through the opposite end of the second guide member 211;
part of the structure of the floating male die is inserted into the third mounting cavity, and part of the structure of the second punch 22 is inserted into the second mounting cavity; the second guide member 211 is further provided with a first mounting hole communicating the second mounting cavity with the outside, the locking member 24 is arranged in the first mounting hole, and the locking member 24 is in threaded connection with the side wall of the first mounting hole; the end of retaining member 24 is pressed against the side wall of second punch 22.
In this embodiment, preferably, as shown in fig. 3, the die body further includes a first stopper member 212 and a mounting member 213 which are disposed in sequence in the second mounting cavity, and the first stopper member 212 is disposed near the second punch 22;
the first position-limiting member 212 has a second mounting hole penetrating through two sides thereof, the second mounting hole is provided with an elastic component 214, the elastic component 214 comprises an elastic component 2141, a force-applying component 2142 and a second position-limiting component 2143, and the elastic component 2141 is disposed in the second mounting hole;
the first limiting member 212 is provided with a third mounting hole, the third mounting hole penetrates through the side wall of the first limiting member 212, and the second limiting member 2143 is inserted into the third mounting hole; the second limiting member 2143, the elastic member 2141, the force application member 2142 and the second punch 22 are sequentially abutted along the length direction of the second punch 22;
and the force application member 2142 pushes the second punch 22 away from the end of the second mounting space close to the first mounting space by a predetermined distance before heading the preform 3.
According to the above-described structure, the second punch 22 slightly floats under the action of the elastic member 2141 and the force application member 2142, so that the distance of the concave pits formed by the four processes on the preform 3 can be offset, and the impact force of the second punch 22 on the teeth can be buffered, thereby preventing the second punch 22 from being broken.
In this embodiment, the inner multi-tooth bolt forming system preferably further comprises a manipulator device and a cutting device (not shown in the figure); the manipulator device is used for conveying the preformed blank 3 between different stations in the multi-station cold heading equipment, so that the possibility of continuous production is provided, and the degree of mechanization is high;
the cutting device is used for cutting bars with preset sizes, and a cutting machine in the prior art can be adopted, so that the details are not described.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A forming process of an inner multi-tooth bolt is characterized by comprising the following steps:
carrying out backward extrusion operation on the preformed bolt with the formed pit at the head part to form an inner polygon;
and (4) upsetting the preformed bolt with the head part formed with the inner polygon to form a final product.
2. A process for forming an inner multi-tooth bolt according to claim 1, wherein the first punch orientation used in the backward extrusion step is the same as the orientation of the preformed bolt in the backward extrusion step;
the orientation of a second punch used in the final heading step is the same as that of the preformed bolt in the final heading step;
the orientation of the preformed bolt in the backward extrusion step is kept unchanged from the orientation of the preformed bolt in the final heading step.
3. A process for forming an inner multi-tooth bolt according to claim 1 or 2, wherein the step of performing a backward extrusion operation on the pre-formed bolt having the dented head portion further comprises the steps of:
cutting: cutting a cylindrical bar stock according to a preset size;
forward extrusion: forward extruding the bar stock to form a screw part and a threaded connecting part of a preformed bolt;
primary heading; heading the screw part of the preformed bolt to form the head part of the preformed bolt;
pre-forming pits on the head part: forming a recess in the head of the preformed bolt.
4. A forming system of an inner multi-tooth bolt, characterized in that based on the forming process of the inner multi-tooth bolt of any one of claims 1 to 3, the forming system of the inner multi-tooth bolt comprises a multi-station cold heading device, and the multi-station cold heading device comprises a backward extrusion die of the inner multi-angle bolt and an upset head die of the inner multi-angle bolt.
5. The system for forming an inner multi-tooth bolt according to claim 4, wherein the back-extrusion die for an inner multi-tooth bolt comprises: the first die comprises a first die body, a first punch and a first floating male die; part of the structure of the first floating male die is embedded in one end of the first die body;
the first punch penetrates through the first floating male die, one end of the first punch penetrates through the first floating male die and abuts against the first die body, and the other opposite end of the first punch penetrates through the first floating male die and extends to the outside of the first floating male die;
the first punch is locked on the first die body through a first fastening member embedded in the first die body; the first floating male die can move along the length direction of the first punch;
when the first floating convex die moves to a first limit position towards the preformed blank, a preset distance is reserved between the end surface of the head of the preformed blank and the end surface of the first floating convex die close to the preformed blank.
6. The system for forming an inner multi-tooth bolt according to claim 5, wherein the die body includes a first guide member, a punch fixing member, and a punch stopper member; wherein the first guide member has a first mounting space formed therethrough at opposite ends thereof, and the punch fixing member and the punch stopper member are sequentially disposed in the first mounting space along a longitudinal direction of the first mounting space;
one end of the first floating male die is inserted into one end of the first installation space, the first floating male die abuts against the punch fixing member, and the other opposite end of the first floating male die extends to the outside of the first guide member;
the punch fixing member is provided with a second mounting space penetrating through two opposite ends of the punch fixing member, and the first punch is inserted into the second mounting space;
the punch fixing member is provided with a first mounting hole communicated with the second mounting space, the first mounting hole penetrates through the side wall of the punch fixing member, the first fastening member is arranged in the first mounting hole, and the first fastening member is in threaded connection with the side wall of the first mounting hole; the end of the first fastening member is pressed against the side wall of the first punch;
the punch fixing member and the first punch are both abutted against the punch stopper member, and the punch stopper member is connected to the first guide member by a second fastening member.
7. The system for forming an inner multi-tooth bolt according to claim 6, wherein the heading die for the inner multi-tooth bolt comprises: the second die comprises a second die body, a second punch and a second floating male die; part of the structure of the second floating male die is embedded in one end of the second die body;
the second punch penetrates through the second floating male die, one end of the second punch penetrates through the second floating male die and abuts against the second die body, and the other opposite end of the second punch penetrates through the second floating male die and extends to the outside of the second floating male die;
the second punch is locked on the second die body through a locking component embedded in the second die body; the second floating punch is movable along the length of the second punch to perform a heading operation on the preform.
8. An internal multi-tooth bolt forming system according to claim 7, wherein the second die body includes a second guide member having a first mounting cavity, a second mounting cavity and a third mounting cavity communicated in this order, the first mounting cavity penetrating one end of the second guide member, the third mounting cavity penetrating the opposite end of the second guide member;
part of the structure of the floating male die is inserted into the third mounting cavity, and part of the structure of the second punch is inserted into the second mounting cavity; the second guide member is also provided with a first mounting hole communicated with the second mounting cavity and the outside, the locking member is arranged in the first mounting hole, and the locking member is in threaded connection with the side wall of the first mounting hole; the end of the locking member is pressed against the side wall of the second punch.
9. The system for forming an inner multi-tooth bolt according to claim 8, wherein the die body further includes a first stopper member and a mounting member which are disposed in the second mounting cavity in this order, and the first stopper member is disposed adjacent to the second punch;
the first limiting component is provided with a second mounting hole penetrating through two sides of the first limiting component, an elastic assembly is arranged in the second mounting hole and comprises an elastic component, a force application component and a second limiting component, and the elastic component is arranged in the second mounting hole;
the first limiting member is provided with a third mounting hole, the third mounting hole penetrates through the side wall of the first limiting member, and the second limiting member is inserted into the third mounting hole; the second stopper member, the elastic member, the urging member, and the second punch are sequentially abutted along a longitudinal direction of the second punch;
and before the pre-formed blank heading is formed, the force application component pushes the second punch to be away from the end part of the second installation space, close to the first installation space, by a preset distance.
10. An inner multi-tooth bolt forming system according to claim 4, wherein said inner multi-tooth bolt forming system further comprises a robot means and a cutting means; the manipulator device is used for conveying preformed blanks between different stations in the multi-station cold heading equipment; the cutting device is used for cutting out a bar stock with a preset size.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010084.7A CN112828235B (en) | 2021-01-05 | 2021-01-05 | Forming system for internal multi-tooth bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010084.7A CN112828235B (en) | 2021-01-05 | 2021-01-05 | Forming system for internal multi-tooth bolt |
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| CN112828235A true CN112828235A (en) | 2021-05-25 |
| CN112828235B CN112828235B (en) | 2022-11-04 |
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|---|---|---|---|---|
| JP2006292717A (en) * | 2005-03-18 | 2006-10-26 | Meidoo:Kk | Bolt and manufacturing method |
| CN102152064A (en) * | 2010-11-29 | 2011-08-17 | 宁波拓隆精密模具有限公司 | Method for manufacturing high-intensity internal multi-tooth hexagonal-head flange-face bolt |
| WO2015165615A1 (en) * | 2014-04-29 | 2015-11-05 | Siemens Aktiengesellschaft | Device, screw, and method for supporting independent threading of a screwdriver blade |
| CN109719228A (en) * | 2018-12-27 | 2019-05-07 | 常熟市常力紧固件有限公司 | A kind of forming technology of lightweight hexagon flange bolt |
| CN214290423U (en) * | 2020-12-24 | 2021-09-28 | 富奥汽车零部件股份有限公司 | Back extrusion die for internal multi-tooth bolt |
| CN215786478U (en) * | 2020-12-30 | 2022-02-11 | 富奥汽车零部件股份有限公司 | Heading die for internal multi-tooth bolt |
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2021
- 2021-01-05 CN CN202110010084.7A patent/CN112828235B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292717A (en) * | 2005-03-18 | 2006-10-26 | Meidoo:Kk | Bolt and manufacturing method |
| CN102152064A (en) * | 2010-11-29 | 2011-08-17 | 宁波拓隆精密模具有限公司 | Method for manufacturing high-intensity internal multi-tooth hexagonal-head flange-face bolt |
| WO2015165615A1 (en) * | 2014-04-29 | 2015-11-05 | Siemens Aktiengesellschaft | Device, screw, and method for supporting independent threading of a screwdriver blade |
| CN109719228A (en) * | 2018-12-27 | 2019-05-07 | 常熟市常力紧固件有限公司 | A kind of forming technology of lightweight hexagon flange bolt |
| CN214290423U (en) * | 2020-12-24 | 2021-09-28 | 富奥汽车零部件股份有限公司 | Back extrusion die for internal multi-tooth bolt |
| CN215786478U (en) * | 2020-12-30 | 2022-02-11 | 富奥汽车零部件股份有限公司 | Heading die for internal multi-tooth bolt |
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|---|---|
| CN112828235B (en) | 2022-11-04 |
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