CN112296243A - Cold heading processing method and cold heading die for straight-groove cylindrical head screw - Google Patents
Cold heading processing method and cold heading die for straight-groove cylindrical head screw Download PDFInfo
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- CN112296243A CN112296243A CN202011042807.3A CN202011042807A CN112296243A CN 112296243 A CN112296243 A CN 112296243A CN 202011042807 A CN202011042807 A CN 202011042807A CN 112296243 A CN112296243 A CN 112296243A
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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
- B21K1/46—Making machine elements bolts, studs, or the like with heads
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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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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Abstract
The invention relates to processing of a straight-groove cylindrical head screw, in particular to a cold heading processing method and a cold heading die for the straight-groove cylindrical head screw. The cold heading processing method comprises the following steps: pre-upsetting a blank, pre-forming a screw head with an oblate cross section, wherein a long shaft of the oblate cross section is used for corresponding to a straight groove of the screw head; upsetting the head of the screw to enable the head of the screw to tend to be formed except for the straight groove; and step three, upsetting the head of the screw to form a straight groove, and finally upsetting the head of the screw. The cold heading die comprises a female die and a male die and is provided with a pre-heading station, the cross section of a forming cavity of the male die of the pre-heading station is oblate, and a long shaft of the oblate is used for corresponding to a straight groove at the head of the screw; a shaping station for shaping the screw head except the straight slot; and the grooving station is used for forming a straight groove on the head of the screw. Above-mentioned scheme can realize the cold-heading processing in the straight line groove of cylinder head screw head.
Description
Technical Field
The invention relates to processing of a straight-groove cylindrical head screw, in particular to a cold heading processing method and a cold heading die for the straight-groove cylindrical head screw.
Background
The production process of screw products is relatively simple, but the application is wide and the demand is large, so that the processing of the screw products has the inevitable trend of high quality stability, high production efficiency and low processing cost. At present, most of products adopt an upsetting processing scheme, and the processing efficiency can be improved and the processing cost can be reduced to the maximum extent by realizing non-turning processing.
However, some products have high precision requirements, and the straight groove of the head of the straight-groove cylindrical head screw product is an asymmetric structure because the straight groove is the long groove, and if cold heading processing is directly adopted, the head is not round after grooving, so that the straight groove heading processing of the head cannot be realized, and a milling machine is adopted for grooving, so that raw materials are wasted, the overall processing cost of the product is increased, and the delivery cycle of the product is greatly influenced.
Chinese patent publication No. CN107671226A discloses a method for forming a flat round head slotted screw, which also addresses the following problem "the part cannot be directly cold-headed for many years. Therefore, for such parts, the machining process is often changed, and the machining flow of heading → groove milling → thread rolling is adopted, so that the part material is firstly subjected to cold heading forming, then a straight groove is milled on a special milling machine, and finally thread rolling forming is carried out. However, when the straight groove of the part is machined, the head part is easy to crack and dent, the quality of the part is not easy to guarantee, and the efficiency is low. The solution is to use the initial upsetting die and the straight groove male die (i.e. forming die) to realize the forming of the flat round head straight groove screw, but the general dies are provided with the initial upsetting die and the forming die, and the patent document does not disclose how to solve the problem of deformation of the head of the screw when the straight groove is subjected to cold upsetting.
Disclosure of Invention
The invention aims to provide a cold heading processing method of a straight-line groove cylindrical head screw, which realizes the cold heading processing of a straight-line groove at the head part of the cylindrical head screw, improves the utilization rate of materials and reduces the processing cost; meanwhile, the invention also aims to provide a cold heading die for the straight-groove cylindrical head screw, which can realize the cold heading processing of the straight groove at the head part of the cylindrical head screw.
The cold heading processing method of the straight-groove cylindrical head screw adopts the following technical scheme:
the cold heading processing method of the slotted cylinder head screw comprises the following steps:
pre-upsetting a blank, pre-forming a screw head with an oblate cross section, wherein a long shaft of the oblate cross section is used for corresponding to a straight groove of the screw head;
upsetting the head of the screw to enable the head of the screw to tend to be formed except for the straight groove;
and step three, upsetting the head of the screw to form a straight groove, and finally upsetting the head of the screw.
Has the advantages that: by adopting the technical scheme, the head of the screw with the oblate cross section is preformed through pre-upsetting, the redundant volume generated during upsetting the straight-line groove can be compensated, the deformation is reserved, and the phenomenon that the head of the screw is out of round when upsetting the straight-line groove is avoided; compared with the prior art, the cold heading processing of the straight groove at the head part of the cylindrical head screw can be realized under the condition of ensuring the precision, the material utilization rate and the processing efficiency are improved, and the processing cost is reduced.
As a preferred technical scheme:
the second step comprises the following steps: the head of the screw is upset to form a convex ridge which extends along the long axis of the oblate, and two sides of the convex ridge in the width direction form a convex ridge slope.
Has the advantages that: by adopting the technical scheme, the convex ridge can enable the formed primary groove opening to be fuller, and the notch is avoided, so that the product precision and the forming quality are favorably improved.
As a preferred technical scheme:
the second step comprises the following steps: the second step also comprises the following steps: after the convex ridge is upset, a groove is upset at the head of the screw, the groove extends along the long axis of the oblate, and groove slope surfaces are formed on two sides of the groove in the width direction.
Has the advantages that: by adopting the technical scheme, the grooves can avoid the problems of burrs, folding notches and the like of the notches of the straight-line grooves caused by excessive deformation at one time.
As a preferred technical scheme:
the top surface of the ridge is arranged to be a plane; the bottom surface of the groove is set to be a plane.
Has the advantages that: by adopting the technical scheme, the workpiece is stably stressed, and the forming precision is favorably controlled.
As a preferred technical scheme: in the first step, the oblate comprises two first arcs positioned at two ends of the long shaft and also comprises second arcs positioned at two ends of the short shaft; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc.
Has the advantages that: by adopting the technical scheme, the design and the manufacture of the die are convenient.
The cold heading die for the straight-groove cylindrical head screw adopts the following technical scheme:
cold-heading mould of a word groove cylindric head screw includes:
the female die is provided with a rod cavity, and the rod cavity is used for inserting the rod part of the screw to position the workpiece;
the male die is provided with a forming cavity, and the forming cavity is used for upsetting the head of the forming screw;
each station of the cold heading die is provided with a male die corresponding to the station;
the cold heading die comprises the following stations:
the cross section of a forming cavity of a male die of the pre-upsetting station is oblate, the forming cavity is used for preforming a screw head with an oblate cross section, and a long shaft of the oblate is used for corresponding to a straight groove of the screw head;
the male die of the shaping station is used for enabling the part of the head of the screw except the straight groove to tend to be shaped;
the grooving station is provided with a straight protrusion on the bottom wall of a forming cavity of the grooving station and used for forming a straight groove at the head of the screw.
Has the advantages that: by adopting the technical scheme, the screw head with an oblate cross section can be preformed when the die is used, the redundant volume generated during the upsetting of the straight-line groove can be compensated, the deformation is reserved, and the phenomenon that the screw head is out of round when the upsetting of the straight-line groove is carried out is avoided; compared with the prior art, the cold heading processing of the straight groove at the head part of the cylindrical head screw can be realized under the condition of ensuring the precision, the material utilization rate and the processing efficiency are improved, and the processing cost is reduced.
As a preferred technical scheme:
the shaping station comprises the following stations: the shaping device comprises a first shaping station, wherein the cavity bottom of a forming cavity of a male die of the shaping station is a concave surface and is used for upsetting a convex ridge at the head of a screw, the convex ridge extends along the long axis of a flat circle, and convex ridge slope surfaces are formed on two sides of the convex ridge in the width direction.
Has the advantages that: by adopting the technical scheme, the convex ridge can enable the formed primary groove opening to be fuller, and the notch is avoided, so that the product precision and the forming quality are favorably improved.
As a preferred technical scheme:
the shaping station comprises the following stations: and in the second shaping station, the cavity bottom of the forming cavity of the male die is a convex surface and is used for upsetting a groove at the head of the screw, the groove extends along the long axis of the oblate, and two sides of the width direction of the groove form a groove slope surface.
Has the advantages that: by adopting the technical scheme, the grooves can avoid the problems of burrs, folding notches and the like of the notches of the straight-line grooves caused by excessive deformation at one time.
As a preferred technical scheme: the bottom of the concave surface is a plane and is used for enabling the top surface of the raised ridge to be a plane; the bottom surface of the groove is a plane and is used for enabling the bottom surface of the groove to be a plane.
Has the advantages that: by adopting the technical scheme, the workpiece is stably stressed, and the forming precision is favorably controlled.
As a preferred technical scheme: in the pre-upsetting station, oblate corresponding to the cross section of a forming cavity of the male die comprises two first arcs positioned at two ends of a long shaft and second arcs positioned at two ends of a short shaft; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc.
Has the advantages that: by adopting the technical scheme, the design and the manufacture of the die are convenient.
For the subject to be protected by the present patent, each preferred technical solution under the same subject may be adopted alone, and when the preferred technical solutions under the same subject can be combined, two or more preferred technical solutions under the same subject may be arbitrarily combined, and the technical solutions formed by the combination are not specifically described here, and are included in the description of the present patent in this form.
Drawings
FIG. 1 is a schematic structural view of a cold-heading die for a slotted cylinder head screw according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a top view of the lower die of FIG. 1;
FIG. 4 is a schematic view of the forming process of the cold heading method for a slotted cylinder head screw according to the present invention;
FIG. 5 is a diagram comparing the variation of the second station with that of the third station, the two-dot chain line showing the outline of the screw head at the second station, and the solid line showing the outline of the screw head at the third station;
the names of the components corresponding to the corresponding reference numerals in the drawings are:
10-an upper die, 11-an upper die holder, 12-a die assembly, 13-a male die, 14-a forming cavity, 15-a straight protrusion, 20-a lower die, 21-a lower die holder, 22-a rod die assembly, 23-a female die, 24-a die rod, 25-a cutting assembly, 31-a pre-upsetting station, 32-a first shaping station, 33-a second shaping station, 34-a first grooving station, 35-a second grooving station, 40-a clamp, 51-a screw head, 52-a screw rod, 53-a convex ridge, 54-a convex ridge slope, 55-a groove, 56-a groove slope and 57-a straight groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
Embodiment 1 of the cold-heading die for a slotted cylinder head screw of the present invention:
the cold heading die for the slotted cylindrical head screw is arranged on a multi-station cold heading machine with the station number being more than or equal to 5. As shown in fig. 1, the mold includes an upper mold 10 and a lower mold 20; the upper die 10 comprises an upper die holder 11 and 5 sets of die assemblies 12, as shown in fig. 2, each die assembly 12 comprises a male die 13, each male die 13 is provided with a forming cavity 14, and each forming cavity 14 is used for upsetting a screw head 51; referring to fig. 1 and 3, the lower die 20 includes a lower die base 21, 5 sets of rod die assemblies 22 and 1 set of material cutting assemblies 25, the rod die assemblies 22 include a female die 23 having a rod cavity for inserting the rod of a screw to position a workpiece and a die rod 24 for jacking the workpiece and material returning; after the assembly of each assembly is finished, each assembly is installed at a corresponding position of the cold header, and continuous automatic upsetting is realized through a machine tool feeding system and a hydraulic transmission system. The blanking assembly 25, the machine tool feeding system and the hydraulic transmission system are prior art and will not be described in detail here.
One of the key points of the cold heading scheme is that the shape of the screw head 51 is upset into an oblate circle when the first station to the third station are formed, so that the redundant volume generated when the straight groove 57 is upset can be compensated, and the phenomenon that the screw head 51 is out of round when the straight groove 57 is upset is avoided. Specifically, the cold heading mould comprises the following five stations:
one pre-upsetting station 31, the first station in the figure, is provided, the forming cavity 14 of the male pre-upsetting die 13 of the pre-upsetting station 31 being oblate in cross section for pre-forming the screw head 51 with an oblate cross section, the long axis of the oblate being intended to correspond to the linear slot 57 of the screw head 51. In the pre-upsetting station 31, oblates corresponding to the cross section of the forming cavity 14 of the male die 13 comprise two first arcs positioned at two ends of a long shaft and also comprise second arcs positioned at two ends of a short shaft; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc. Of course, the size of the oblate is determined by calculation based on the volume of the straight groove 57 and the direction of flow of the final upset metal.
Two shaping stations, including a first shaping station 32 and a second shaping station 33, i.e. the second and third stations in the figure, respectively; the male die 13 of the reforming station is used to shape the screw head 51 except for the in-line slot 57.
As shown in fig. 4 and 5, in the first shaping station 32, the male die 13 of the station is a first shaping male die 13, the cavity bottom of the forming cavity 14 of the station is a concave surface, and is used for upsetting a convex ridge 53 at the screw head 51, the convex ridge 53 extends along the long axis of an oblate, and the two sides of the convex ridge 53 in the width direction form convex ridge 53 slopes; the bottom of the concave surface is a plane for making the top surface of the ridge 53 be a plane, and the width of the plane of the bottom of the concave surface is larger than the width of the straight groove 57 of the straight-groove cylindrical head screw.
The male die 13 of the second shaping station 33 is a second shaping male die 13, the cavity bottom of the forming cavity 14 of the second shaping station is a convex surface and is used for upsetting a groove 55 at the screw head 51, the groove 55 extends along the long axis of the oblate, and two sides of the width direction of the groove 55 form groove 55 slope surfaces; the top of the convex surface is a plane for making the bottom surface of the groove 55 a plane, and the width of the top plane of the convex surface is larger than the width of the straight groove 57 of the straight-groove cylindrical head screw.
Two grooving stations, a first grooving station 34 and a second grooving station 35, respectively, are the fourth and fifth stations in the figure. The male dies 13 of the two grooving stations are respectively a first forming male die 13 and a second forming male die 13, and the bottom walls of the forming cavities 14 of the first forming male die 13 and the second forming male die 13 are provided with linear protrusions 15 for forming linear grooves 57 on the screw heads 51. The first grooving station 34 performs a rough heading of the linear groove 57 and the screw head 51, and the second grooving station 35 performs a finish heading of the head including the linear groove 57 to achieve a final forming of the screw head 51.
As is conventional, upsetting uses a gripper 40 to effect product flow between stations, as shown in fig. 3. In order to avoid the problem that the product cannot be smoothly fed into the mold during the transfer, the aperture of the female mold 23 in each process is not smaller than that of the female mold 23 in the previous process. The product debugging and processing also pay attention to calculating the material used by the screw head 51, so that the blanking length meets the upsetting requirement, and the material used by the screw head 51 is ensured to be consistent when each station is formed, otherwise, the joint of the head and the rod of the upset product is easy to have defects of folding and the like.
As shown in fig. 4, during cold heading, a machine tool is started, a material is cut off by a material cutter at a material cutting assembly 25, the material is conveyed to a first station by a clamp 40, the machine tool is closed, a blank is extruded through a pre-punching thimble and a pre-punching station material returning rod, pre-punching molding is carried out in a pre-punching assembly orifice cavity, and after the pre-punching molding, a semi-finished product is sequentially transferred to a second station, a third station and a fourth station by the clamp 40 for molding; and after the fourth station is formed, the machine tool is opened, the material returning rod withdraws the workpiece, the workpiece is conveyed to the fifth station by the clamp 40 and finally formed by the punch in the five sequences, and the processing of the straight-line groove cylindrical head screw is finished.
Embodiment 2 of the cold-heading die for the slotted cylinder head screw of the present invention:
the present embodiment is different from embodiment 1 in that, in embodiment 1, the shaping stations include a first shaping station 32 and a second shaping station 33, that is, a second station and a third station; in the embodiment, the shaping station only has the first shaping station 32, and the subsequent grooving station is directly carried out, namely, the third station is omitted.
Embodiment 3 of the cold-heading die for the slotted cylinder head screw of the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, at the first shaping station 32, that is, at the second station, the cavity bottom of the molding cavity 14 of the male die 13 is a concave surface for upsetting a ridge 53 at the screw head 51, the ridge 53 extends along the long axis of the oblate, two sides of the ridge 53 in the width direction form a ridge 53 slope surface, and the ridge 53 slope surface is a planar slope surface; in this embodiment, the slope of the convex ridge 53 is a cambered slope.
Embodiment 4 of the cold-heading die for the slotted cylinder head screw of the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, at the first shaping station 32, that is, at the second station, the cavity bottom of the molding cavity 14 of the male die 13 is a concave surface for upsetting the ridge 53 at the screw head 51, the bottom of the concave surface is a flat surface for making the top surface of the ridge 53 be a flat surface, and the width of the bottom flat surface of the concave surface is greater than the width of the linear groove 57 of the linear groove cylindrical head screw; in this embodiment, the bottom of the concave surface is a curved surface.
Of course, in other embodiments, the width of the bottom flat surface of the concave surface may be equal to or less than the width of the linear slot 57 of the linear-slotted cap screw.
Embodiment 5 of the cold-heading die for the slotted cylinder head screw of the present invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the cavity bottom of the molding cavity 14 of the male mold 13 is concave at the first shaping station 32, i.e., the second station, whereas in this embodiment, the cavity bottom of the molding cavity 14 of the male mold 13 is flat.
In other embodiments, when only one shaping station is provided, the bottom of the forming cavity 14 of the male mold 13 may be a plane.
Example 6 of the cold-heading die for the slotted cylinder head screw of the present invention:
the present embodiment is different from embodiment 1 in that the grooving station is divided into two steps in embodiment 1, but the grooving station is provided in only one step in this embodiment.
Embodiment 1 of the cold heading processing method of a slotted cylinder head screw of the present invention:
a cold heading method for a slotted cylindrical head screw is shown in figures 1 and 4, and adopts a multi-station cold heading machine with no less than 5 stations for processing, and specifically comprises the following steps:
selecting a cylindrical bar, pre-upsetting the blank by using a cold header, pre-forming a screw head 51 with an oblate cross section, wherein the oblate long shaft is used for corresponding to a straight groove 57 of the screw head 51; the oblate comprises two first arcs positioned at two ends of the long shaft and second arcs positioned at two ends of the short shaft; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc. Of course, the size of the oblate is determined by calculation based on the volume of the straight groove 57 and the direction of flow of the final upset metal.
Upsetting the screw head 51 to enable the screw head 51 except for the straight-line groove 57 to tend to be formed; the second step is divided into the following two steps:
a. a convex ridge 53 is upset at the screw head 51, the convex ridge 53 extends along the long axis of the oblate, the two sides of the width direction of the convex ridge 53 form a convex ridge 53 slope, the top surface of the convex ridge 53 is a plane, and the slope is a plane slope;
b. a groove 55 is upset at the screw head 51, the groove 55 extends along the long axis of an oblate circle, two sides of the width direction of the groove 55 form a groove 55 slope, the bottom surface of the groove 55 is a plane, and the slope is a plane slope.
And step three, upsetting the screw head 51, forming a straight groove 57, and finally upsetting the screw head 51. The second step is divided into the following two steps:
a. performing rough upsetting on the linear groove 57 and the screw head 51;
b. the head finish upsetting including the linear groove 57 is completed, and the final forming of the screw head 51 is realized.
Other embodiments of the cold heading processing method of the straight-groove cylindrical head screw of the invention are as follows: the other embodiment of the cold heading method for the slotted cylinder head screw is the method for processing by adopting any one of the embodiments 2 to 6 of the cold heading die, and the method is not specifically described here.
The above description is only a preferred embodiment of the present application, and not intended to limit the present application, the scope of the present application is defined by the appended claims, and all changes in equivalent structure made by using the contents of the specification and the drawings of the present application should be considered as being included in the scope of the present application.
Claims (10)
1. The cold heading processing method of the slotted cylinder head screw is characterized by comprising the following steps:
firstly, pre-upsetting a blank, and pre-forming a screw head (51) with an oblate cross section, wherein the long axis of the oblate is used for corresponding to a straight groove (57) of the screw head (51);
upsetting the screw head (51) to enable the part of the screw head (51) except the straight groove (57) to tend to be formed;
and step three, upsetting the screw head (51), forming a linear groove (57), and finally upsetting the screw head (51).
2. The cold heading process according to claim 1, wherein the second step includes the steps of:
a convex ridge (53) is upset at the screw head (51), the convex ridge (53) extends along the long axis of the oblate, and convex ridge slopes (54) are formed on two sides of the convex ridge (53) in the width direction.
3. The cold heading process according to claim 2, wherein the second step further comprises the steps of: after the convex ridge (53) is upset, a groove (55) is upset at the screw head (51), the groove (55) extends along the long axis of the oblate, and groove slopes (56) are formed on two sides of the groove (55) in the width direction.
4. A cold heading process according to claim 3, wherein the top surface of the ridge (53) is provided as a flat surface; the bottom surface of the groove (55) is arranged to be a plane.
5. A cold heading process according to any one of claims 1 to 4, wherein in the first step, the oblate comprises two first arcs at both ends of the major axis and further comprises second arcs at both ends of the minor axis; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc.
6. Cold-heading mould of a word groove cylindric head screw includes:
a female die (23) having a shank cavity into which a screw shank (52) is inserted to position a workpiece;
a male die (13) having a forming cavity (14), the forming cavity (14) being used for upsetting a screw head (51);
each station of the cold heading die is provided with a male die (13) corresponding to the station;
the cold heading die is characterized by comprising the following stations:
the cross section of a forming cavity (14) of a male die (13) of the pre-upsetting station (31) is oblate, the forming cavity is used for preforming a screw head (51) with an oblate cross section, and the long axis of the oblate is used for corresponding to a straight groove (57) of the screw head (51);
a shaping station, wherein a male die (13) of the shaping station is used for enabling the screw head (51) except for the straight groove (57) to tend to be shaped;
the grooving station is provided with a linear protrusion (15) on the bottom wall of a forming cavity (14) of the grooving station and used for forming a linear groove (57) on the screw head (51).
7. A cold-heading die according to claim 6,
the shaping station comprises the following stations:
the shaping device comprises a first shaping station (32), wherein the cavity bottom of a forming cavity (14) of a male die (13) of the station is concave, a convex ridge (53) is upset at the head part (51) of a screw, the convex ridge (53) extends along the long axis of an oblate, and convex ridge slope surfaces (54) are formed on two sides of the convex ridge (53) in the width direction.
8. The cold heading die of claim 7, wherein the shaping station comprises:
and a second shaping station (33), wherein the cavity bottom of the forming cavity (14) of the male die (13) of the station is convex, and is used for upsetting a groove (55) at the head part (51) of the screw, the groove (55) extends along the long axis of the oblate, and two sides of the width direction of the groove (55) form groove slope surfaces (56).
9. A cold heading die according to claim 8, wherein the bottom of the concave surface is flat for making the top surface of the ridge (53) flat;
the bottom surface of the groove (55) is a plane, and the bottom surface of the groove (55) is a plane.
10. A cold heading die according to any one of claims 6 to 9, wherein in the pre-heading station (31), the oblate corresponding to the cross section of the forming cavity (14) of the male die (13) comprises two first arcs at two ends of the long axis and further comprises two second arcs at two ends of the short axis; the radius of curvature of the first circular arc is smaller than the radius of curvature of the second circular arc.
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| CN202011042807.3A CN112296243B (en) | 2020-09-28 | 2020-09-28 | Cold heading processing method and cold heading die for straight-groove cylindrical head screw |
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| CN202011042807.3A CN112296243B (en) | 2020-09-28 | 2020-09-28 | Cold heading processing method and cold heading die for straight-groove cylindrical head screw |
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| CN114713750A (en) * | 2022-03-31 | 2022-07-08 | 佛山市南海区锦华标准件厂 | T-shaped nail head forming process |
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2020
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| JP2007136460A (en) * | 2005-11-14 | 2007-06-07 | Kobe Steel Ltd | Method for pressure-forming bolt |
| CN202411311U (en) * | 2011-11-10 | 2012-09-05 | 深圳航空标准件有限公司 | Cold upsetting die for dovetail groove screw |
| CN103386458A (en) * | 2013-07-23 | 2013-11-13 | 苏州工业园区新凯精密五金有限公司 | Forming method of straight slot or cross slot flat tail screw and die structure adopted by same |
| JP2016074006A (en) * | 2014-10-07 | 2016-05-12 | イワタボルト株式会社 | Manufacturing method of screw, and screw |
| CN107335767A (en) * | 2017-09-04 | 2017-11-10 | 江西洪都航空工业集团有限责任公司 | A kind of cruciform slot screw cold-heading molding processing mold and its processing technology |
| CN107671226A (en) * | 2017-09-30 | 2018-02-09 | 江西洪都航空工业集团有限责任公司 | A kind of oval head slotted head screw forming method |
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| CN114713750A (en) * | 2022-03-31 | 2022-07-08 | 佛山市南海区锦华标准件厂 | T-shaped nail head forming process |
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| CN112296243B (en) | 2022-10-11 |
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