Static disc nut cold heading die
By using a multi-step cold heading die to gradually form the stationary disc nut, the problem of improper deformation control during the cold heading process of the stationary disc nut was solved, achieving precise forming and improved structural strength, and avoiding part defects.
Patent Information
- Application Number
- CN202423158141.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In the existing technology, the forming accuracy and structural strength requirements of the frustum section, disc section, cylindrical section and prism section are high during the cold heading process of the stationary disc nut. However, one-time cold heading is prone to improper control of deformation, which can lead to cracking or breakage of the parts.
A multi-step cold heading die is used, including a first die, a second die, a third die, and a fourth die. The die gradually forms frustum segments, disc segments, cylindrical segments, and prism segments. The first die, the second die, the third die, and the fourth die are used to perform multiple cold heading expansion and forming of the blank. Combined with the main die, the punching die, and the cutting die, the material flow and deformation are precisely controlled.
It achieves precise forming of static disc nuts, avoids product surface dimensions not conforming to geometric tolerances, ensures forming accuracy and structural strength, and avoids the risk of parts cracking or breaking.
Smart Images
Figure CN223699211U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cold heading processing field especially relates to a static disc nut cold heading die. BACKGROUND
[0002] Cold heading is a kind of forging method that uses die to upset (usually local upset) metal bar stock at room temperature.Forming the head of screw, bolt, rivet, etc.It can reduce or replace cutting processing.
[0003] As shown in Figures 8 to 9 There is a kind of bolt nut of static disc of bicycle at present, the bolt has the static disc nut including circular truncated cone section, disc section, cylindrical section and prism section, the diameter of circular truncated cone section, disc section, cylindrical section and prism section decreases in turn.Internal thread is machined in the center hole of the nut after cold heading.The forming precision of circular truncated cone section, disc section, cylindrical section and prism section is required to be higher, and the structural strength thereof is also required to be higher.The cold heading process may cause deformation control to be out of place, and the part may crack, break and other problems.
[0004] Therefore, the utility model provides a kind of static disc nut cold heading die, solve the problem that the profile of corresponding part is deformed when being cold headed once. UTILITY MODEL CONTENTS
[0005] To achieve the above object, the utility model adopts the following technical scheme: a kind of static disc nut cold heading die, the static disc nut includes circular truncated cone section, disc section, cylindrical section and prism section connected in turn, the smallest diameter R1 of circular truncated cone section>Diameter R2 of disc section>Cylindrical section diameter R3>Diagonal line length L of the bottom surface of prism section, the height of the prism section is less than the height of the cylindrical section, the center hole that is sequentially through circular truncated cone section, disc section, cylindrical section and prism section is set in the center position of the static disc nut, the end face of disc section is provided with annular groove around cylindrical section, the surface of circular truncated cone section away from disc section is provided with a plurality of grooves in annular array, the cold heading die includes one die, two die, three die and four die arranged in turn;
[0006] One die forms cylindrical rod rough billet one by reducing the diameter of one end of blank;
[0007] Two die forms six-prism rod rough billet two by upsetting rod rough billet one, and two die forms head rough billet two by lengthening head rough billet one;
[0008] Three die forms six-prism rod rough billet three by upsetting rod rough billet two, three die forms a step at the end of head rough billet two away from rod rough billet two, and three die forms head rough billet three by upsetting positioning hole at the center position of head rough billet two.
[0009] The four-step die forms a circular step section by upsetting the step away from one end of the rod blank three, forms a circular disc section by upsetting the step close to one end of the rod blank three, forms a prismatic section by upsetting the rod blank three, forms a cylindrical section by upsetting the rod blank three close to one end of the head blank three, forms a center hole by expanding the positioning hole, and forms a groove on the end face of the head blank three and the rod blank three.
[0010] Preferably, the four-step die comprises a main die four and a punch die four, the main die four comprises a die shell four, a die sleeve, a die core four, a tungsten sleeve sheet one, a tungsten sleeve sheet two, and an insert four, the die sleeve is sleeved inside the die shell four, the tungsten sleeve sheet one, the tungsten sleeve sheet two, and the insert four are coaxially and sequentially stacked inside the die sleeve from outside to inside, the die core four is sleeved inside the die sleeve, and the insert four is embedded at the center position of the end face of the die core four close to the tungsten sleeve sheet two.
[0011] Preferably, the punch die four comprises a punch four and an insert needle four, the insert needle four is embedded at the center position of the punch four, the punch four is provided with a core for forming a groove, the core is uniformly and spacedly arranged around the insert needle four, and the cross section of the core is semicircular, and the cross section of each core gradually decreases in the clockwise direction or the counterclockwise direction.
[0012] Preferably, a step hole one for forming the circular step section and the circular disc section is arranged at the center position of the tungsten sleeve sheet one, a circular hole for forming the cylindrical section is arranged at the center position of the tungsten sleeve sheet two, an annular convex rib is protruded on the surface of the tungsten sleeve sheet two close to the tungsten sleeve sheet one, the annular convex rib is arranged inside the step hole, and a fourth through hole for forming the prismatic section is arranged at the center position of the insert four.
[0013] Preferably, the three-step die comprises a main die three and a punch die three, the main die three comprises a die shell three, a tungsten sleeve sheet three, an insert three, and a die core three, the tungsten sleeve sheet three and the insert three are sequentially and layerwisely arranged inside the die shell three from outside to inside, the die core three is sleeved inside the die sleeve, the insert three is embedded at the center position of the end face of the die core three close to the tungsten sleeve sheet three, a step hole two is arranged at the center position of the tungsten sleeve sheet three, a third through hole for forming the rod blank three is arranged at the center position of the insert three, and the head blank three is formed inside the step hole two.
[0014] Preferably, the two molds comprise a main mold two and a punch mold two, the main mold two comprises a mold shell two, an outer mold core and an inner mold core, the outer mold core and the inner mold core are sequentially arranged inside the mold shell two from outside to inside, an outer forming cavity is arranged at the center position of the outer mold core, an inner forming cavity is arranged at the center position of the inner mold core, the head rough casting two is formed inside the inner forming cavity close to one end of the rod rough casting two, the head rough casting two is formed inside the outer forming cavity away from one end of the rod rough casting two, and the part positions of the head rough casting two and the rod rough casting two are chamfered.
[0015] Preferably, the one mold comprises a main mold one and a punch mold one, the main mold one comprises a mold shell one and a mold core one, the mold core one is arranged inside the mold shell one, a first forming cavity is arranged at the center position of the mold core one, and the rod rough casting one and the head rough casting one are both formed inside the first forming cavity.
[0016] Preferably, the punch mold three, the punch mold two and the punch mold one all comprise a punch mold punch and a punch mold pin, one end of the punch mold pin is detachably arranged at the center position of the punch mold punch, the diameter of the punch mold pin of the punch mold three is equal to that of the rod rough casting four, the diameter of the punch mold pin of the punch mold two is equal to that of the rod rough casting two, and the diameter of the punch mold pin of the punch mold one is equal to that of the rod rough casting one.
[0017] Preferably, the step comprises a circular annular surface and a bottom surface, the bottom surface is arranged at one end of the circular annular surface away from the rod rough casting three, and the bottom surface is a circular arc curved surface.
[0018] Preferably, the static disc nut cold heading die further comprises a cutting die, the cutting die comprises a punch mold, a main mold and a cutter, the cutter is linearly movably arranged at one side of the main mold away from the punch mold, the moving direction of the cutter is perpendicular to the center line of the prism segment, the prism segment is arranged in the main mold, and the cutter cuts the prism segment to a set length.
[0019] The rod is formed by multiple step cold heading and diameter expansion, the head is formed by multiple steps, the flow and deformation of the material can be accurately controlled, the deformation amount of each step is smaller, the deformation amount is controlled to avoid the situation that the surface size of the product does not meet the shape tolerance, and the forming precision requirement is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0020] The drawings further illustrate the utility model, but the embodiments in the drawings do not constitute any limitation on the utility model.
[0021] Figure 1 The structure schematic view of the cold heading die provided by one embodiment of the utility model is shown in the figure;
[0022] Figure 2 The structure schematic view of the one mold provided by one embodiment of the utility model is shown in the figure;
[0023] Figure 3 A structure schematic view of two molds provided by an embodiment of the present utility model;
[0024] Figure 4 A structure schematic view of three molds provided by an embodiment of the present utility model;
[0025] Figure 5 A structure schematic view of four molds provided by an embodiment of the present utility model;
[0026] Figure 6 A static disc nut forming schematic provided by an embodiment of the present utility model Figure 1 ;
[0027] Figure 7 A static disc nut forming schematic provided by an embodiment of the present utility model Figure 2 ;
[0028] Figure 8 A top view of a static disc nut provided by an embodiment of the present utility model;
[0029] Figure 9 A structure schematic view of a static disc nut provided by an embodiment of the present utility model;
[0030] Reference signs: 111: mold shell one; 112: mold core one; 121: punch head of punch one; 122: punch insert of punch one; 211: mold shell two; 212: outer mold core; 213: inner mold core; 221: punch head of punch two; 222: punch insert of punch two; 311: mold shell three; 312: tungsten sleeve sheet three; 313: insert three; 314: mold core three; 321: punch head of punch three; 322: punch insert of punch three; 411: mold shell four; 412: mold sleeve; 413: tungsten sleeve sheet one; 414: tungsten sleeve sheet two; 415: insert four; 416: mold core four; 421: punch four; 422: insert four. DETAILED DESCRIPTION
[0031] The specific embodiments described hereinbefore will be better understood by reference to the following drawings, in which:
[0032] It should be noted that in the present utility model, when an element is referred to as being "fixedly connected" or "disposed" on another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element. The orientation words such as "upper", "lower", "left", "right" used herein refer to the drawings as Figure 1The up, down, left and right are shown.The "inner" and "outer" refer to the inner and outer of the specific profile.The "far" and "near" refer to the far and near relative to a certain component.
[0033] As shown in Figures 1-6 An embodiment of the utility model provides a kind of static disc nut cold heading die, for cold heading processing static disc nut, the static disc nut includes the circular platform section, disc section, cylindrical section and prism section connected in sequence, the circular platform section, disc section, cylindrical section and prism section are in sequence circular platform, flat cylinder, right cylinder and right hexagonal prism, the height of the prism section is less than the height of cylindrical section, the diameter of the cross section of the circular platform section gradually reduces along the direction of disc section, the minimum diameter R1 of circular platform section>Diameter R2 of disc section>the diameter R3 of cylindrical section>the length L of diagonal of bottom surface of prism section, the center hole that is sequentially penetrated circular platform section, disc section, cylindrical section and prism section is set in the center position of the static disc nut, the end surface of disc section is provided with annular groove around cylindrical section, the surface of circular platform section away from disc section is provided with a plurality of grooves in annular array, and the cold heading die includes one die, two dies, three dies and four dies arranged in sequence;
[0034] The one die forms cylindrical rod rough embryo one by reducing the diameter of one end of blank;
[0035] The two dies form six-prism rod rough embryo two by thickening rod rough embryo one, and form head rough embryo two by lengthening head rough embryo one;
[0036] The three dies form six-prism rod rough embryo three by thickening rod rough embryo two, form step at the end of head rough embryo two away from rod rough embryo two, and form positioning hole at the center position of head rough embryo two to form head rough embryo three;
[0037] The four dies form circular platform section at the end of step away from rod rough embryo three, form disc section at the end of step close to rod rough embryo three, form prism section by thickening rod rough embryo three, form cylindrical section by thickening the end of rod rough embryo three close to head rough embryo three, form center hole by expanding positioning hole, and form groove on the end face of head rough embryo three and rod rough embryo three.
[0038] As shown in Figure 5As shown in the figure, the four die includes a main die four and a punch die four, the main die four includes a die shell four 411, a die sleeve 412, a die core four 416, an inner die sleeve 412, a tungsten sleeve sheet one 413, a tungsten sleeve sheet two 414, an insert four 415, the die sleeve 412 is sleeved inside the die shell four 411, the tungsten sleeve sheet one 413, the tungsten sleeve sheet two 414 and the insert four 415 are coaxially stacked in the die sleeve 412 from outside to inside, the die core four 416 is sleeved inside the die sleeve 412, and the insert four 415 is embedded in the center position of the end surface of the die core four 416 close to the tungsten sleeve sheet two 414.
[0039] As shown in the figure, Figure 5 As shown in the figure, the punch die four includes a punch head four 421 and an insert needle four 422, the insert needle four 422 is embedded in the center position of the punch head four 421, the punch head four 421 is provided with a core for forming a groove, the core is uniformly and spacedly arranged around the insert needle four 422, and the cross section of the core is semicircular, and the cross section of each core gradually decreases in the clockwise direction or the counterclockwise direction.
[0040] As shown in the figure, Figure 5 As shown in the figure, the tungsten sleeve sheet one 413 is provided with a stepped hole one for forming a circular truncated cone section and a circular disc section in the center position, the tungsten sleeve sheet two 414 is provided with a circular hole for forming a circular column section in the center position, the surface of the tungsten sleeve sheet two 414 close to the tungsten sleeve sheet one 413 is provided with an annular convex rib, the annular convex rib is arranged inside the stepped hole, and the insert four 415 is provided with a fourth through hole for forming a prism section in the center position.
[0041] As shown in the figure, Figure 4 As shown in the figure, the three die includes a main die three and a punch die three, the main die three includes a die shell three 311, a tungsten sleeve sheet three 312, an insert three 313 and a die core three 314, the tungsten sleeve sheet three 312 and the insert three 313 are sequentially and coaxially arranged inside the die shell three 311, the die core three 314 is sleeved inside the die sleeve 412, the insert three 313 is embedded in the center position of the end surface of the die core three 314 close to the tungsten sleeve sheet three 312, the tungsten sleeve sheet three 312 is provided with a stepped hole two in the center position, the insert three 313 is provided with a third through hole for forming a rod rough casting three in the center position, and the head rough casting three is formed inside the stepped hole two.
[0042] As shown in the figure, Figure 3As shown in the second embodiment, the second die includes a main die two and a punch die two, the main die two includes a die shell two 211, an outer die core 212 and an inner die core 213, the outer die core 212 and the inner die core 213 are sequentially stacked from outside to inside in the die shell two 211, an outer forming cavity is formed at the center position of the outer die core 212, an inner forming cavity is formed at the center position of the inner die core 213, the head blank two is formed inside the inner forming cavity close to one end of the rod blank two, the head blank two is formed inside the outer forming cavity away from one end of the rod blank two, and the part positions of the head blank two and the rod blank two are rounded.
[0043] As shown in the first embodiment, Figure 2 As shown in the first embodiment, the first die includes a main die one and a punch die one, the main die one includes a die shell one 111 and a die core one 112, the die core one 112 is arranged inside the die shell one 111, a first forming cavity is formed at the center position of the die core one 112, and the rod blank one and the head blank one are both formed inside the first forming cavity.
[0044] As shown in the first embodiment, Figures 2 to 4 As shown in the third embodiment, the punch die three, the punch die two and the punch die one all include a punch die punch and a punch die insert, the punch die insert is detachably arranged at one end of the center position of the punch die punch, the diameter of the punch die insert of the punch die three is equal to the diameter of the insert four 422, the diameter of the punch die insert of the punch die two is equal to the diameter of the rod blank two, and the diameter of the punch die insert of the punch die one is equal to the diameter of the rod blank one.
[0045] As shown in the first embodiment, Figure 4 As shown in the third embodiment, the step includes a circular ring surface and a bottom surface, the bottom surface is arranged at one end of the circular ring surface away from the rod blank three, and the bottom surface is a circular arc curved surface.
[0046] As shown in the first embodiment, Figure 7 As shown in the third embodiment, the static disc nut cold heading die further includes a cutting die, the cutting die includes a punch die, a main die and a cutter, the cutter is linearly movably arranged at one side of the main die away from the punch die, the moving direction of the cutter is perpendicular to the center line of the prism segment, the prism segment is arranged in the main die, and the cutter cuts the prism segment to a set length.
[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which should be considered as the scope of the present application.
Claims
1. A static disc nut cold heading die, the static disc nut comprising a circular truncated cone section, a circular disc section, a circular cylinder section and a prism section connected in sequence, a center hole is formed in the center position of the static disc nut and penetrates the circular truncated cone section, the circular disc section, the circular cylinder section and the prism section in sequence, an annular groove is formed in the end face of the circular disc section and surrounds the circular cylinder section, and a plurality of grooves are annularly arranged on the surface of the circular truncated cone section away from the circular disc section, characterized in that: The cold upsetting die comprises a first die, a second die, a third die and a fourth die arranged in sequence; The first die reduces the diameter of one end of the blank to form a cylindrical rod part rough blank I, and the first die upsets the other end of the blank to form a head part rough blank I; The second die upsets the rod part rough blank I to form a hexagonal rod part rough blank II, and the second die upsets the head part rough blank I to form a head part rough blank II; The third die upsets the rod part rough blank II to form a hexagonal rod part rough blank III, the third die upsets the end of the head part rough blank II away from the rod part rough blank II to form a step, and the third die upsets a positioning hole in the center of the head part rough blank II to form a head part rough blank III; The fourth die upsets the end of the step away from the rod part rough blank III to form a circular platform segment, upsets the end of the step close to the rod part rough blank III to form a circular disc segment, upsets the rod part rough blank III to form a prism segment, upsets the end of the rod part rough blank III close to the head part rough blank III to form a cylindrical segment, expands the positioning hole to form a center hole, and upsets a groove on the end face of the head part rough blank III and the rod part rough blank III.
2. The cold-upsetting die for a nut of a silent block according to claim 1, wherein: The fourth die comprises a main die four and a punch die four, the main die four comprises a die shell four, a die sleeve, a die core four, an inner die sleeve, a tungsten sleeve sheet I, a tungsten sleeve sheet II and an insert four, the die sleeve is sleeved in the die shell four, the tungsten sleeve sheet I, the tungsten sleeve sheet II and the insert four are coaxially and sequentially arranged in the die sleeve from outside to inside, the die core four is sleeved in the die sleeve, and the insert four is embedded in the center of the end face of the die core four close to the tungsten sleeve sheet II.
3. The cold-upsetting die for a cotter nut according to claim 2, wherein: The punch die four comprises a punch four and an insert needle four, the insert needle four is embedded in the center of the punch four, the punch four is provided with a core for forming a groove, the core is uniformly and spacedly arranged around the insert needle four, and the cross section of the core is semicircular, and the cross section of each core gradually decreases in the clockwise direction or the counterclockwise direction.
4. The cold upset nut die according to claim 3, wherein: The center of the tungsten sleeve sheet I is provided with a step hole I for forming a circular platform segment and a circular disc segment, the center of the tungsten sleeve sheet II is provided with a circular hole for forming a cylindrical segment, the surface of the tungsten sleeve sheet II close to the tungsten sleeve sheet I is provided with an annular convex rib, the annular convex rib is arranged in the step hole, and the center of the insert four is provided with a fourth through hole for forming a prism segment.
5. The cold heading die for a cotter nut according to claim 3, wherein: The third die comprises a main die three and a punch die three, the main die three comprises a die shell three, a tungsten sleeve sheet three, an insert three and a die core three, the tungsten sleeve sheet three and the insert three are sequentially arranged in the die shell three from outside to inside, the die core three is sleeved in the die sleeve, the insert three is embedded in the center of the end face of the die core three close to the tungsten sleeve sheet three, the center of the tungsten sleeve sheet three is provided with a step hole II, the center of the insert three is provided with a third through hole for forming a rod part rough blank III, and the head part rough blank III is formed in the step hole II.
6. The cold upset nut die according to claim 5, wherein: The second die includes a main die two and a punch die two, the main die two includes a die shell two, an outer mold core and an inner mold core, the outer mold core and the inner mold core are sequentially stacked from outside to inside in the die shell two, an outer forming cavity is arranged at the center position of the outer mold core, an inner forming cavity is arranged at the center position of the inner mold core, the head blank two is formed in the inner forming cavity, one end of the head blank two is formed in the outer forming cavity, and the part position of the head blank two and the rod blank two is rounded.
7. The cold upset nut die according to claim 6, characterized in that: The first die includes a main die one and a punch die one, the main die one includes a die shell one and a mold core one, the mold core one is arranged in the die shell one, a first forming cavity is arranged at the center position of the mold core one, and the rod blank one and the head blank one are formed in the first forming cavity.
8. The cold upset nut die according to claim 7, characterized in that: The punch die three, the punch die two and the punch die one all include a punch die head and a punch die pin, one end of the punch die pin is detachably arranged at the center position of the punch die head, the diameter of the punch die pin of the punch die three is equal to the diameter of the pin four, the diameter of the punch die pin of the punch die two is equal to the diameter of the rod blank two, and the diameter of the punch die pin of the punch die one is equal to the diameter of the rod blank one.
9. The cold heading die for a cotter nut according to claim 1, wherein: The step includes a circular ring surface and a bottom surface, the bottom surface is arranged at one end of the circular ring surface away from the rod blank three, and the bottom surface is a circular arc curved surface.
10. The cold heading die for a cotter nut according to claim 1, wherein: Further comprising a cutting die, the cutting die includes a punch die, a main die and a cutter, the cutter is linearly movably arranged at one side of the main die away from the punch die, the moving direction of the cutter is perpendicular to the center line of the prism segment, the prism segment is arranged in the main die, and the cutter cuts the prism segment to a set length.