CN106424191A - Blind hole rectangular spline cold extrusion forming method - Google Patents
Blind hole rectangular spline cold extrusion forming method Download PDFInfo
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- CN106424191A CN106424191A CN201611014030.3A CN201611014030A CN106424191A CN 106424191 A CN106424191 A CN 106424191A CN 201611014030 A CN201611014030 A CN 201611014030A CN 106424191 A CN106424191 A CN 106424191A
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- cold
- blank
- blind hole
- pull head
- extrusion molding
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Classifications
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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
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention discloses a blind hole rectangular spline cold extrusion forming method. The blind hole rectangular spline cold extrusion forming method includes the machining procedures of cutting, heating, blank upsetting, hot forging rough forming, normalizing, shot blasting, surface treatment and cold extrusion forming, wherein in the heating procedure, after a blank material is heated to 1100 DEG C, a punch press is utilized for blank upsetting; in the surface treatment procedure, macromolecule phosphating liquid is used for performing phosphating treatment on the blank material, and the surface of the blank material is softened and lubricated; and in the cold extrusion procedure, a cold extrusion forming mold is adopted to performing cold extrusion forming on the blank material. The blind hole rectangular spline cold extrusion forming method can meet the machining forming requirement of a blind hole spline and is high in machining efficiency and good in forming precision, a metal streamline structure can be completely reserved, the product quality is improved, and the service life is prolonged.
Description
Technical field
The invention belongs to metal extrusion dies technical field, specifically cold extrusion shaped for a kind of blind hole rectangular spline
Method.
Background technology
Extrusion molding is a kind of advanced manufacturing technology of shaping without stock removal, and it has the advantages that high-quality, efficient, low energy consumption.Square
Shape internal spline is widely used in the mechanized equipments such as automobile, tractor, engineering machinery, is in great demand in actual production.Existing
Rectangle internal spline typically processed by the way of slotting, although can meet processing request to a certain extent, but exist
Process-cycle length, production efficiency low shortcoming during making, and metal streamline structure is destroyed, so as to reduce making for product
Use the life-span.
Content of the invention
In view of this, it is an object of the invention to provide a kind of blind hole rectangular spline cold-extrusion molding method, can not only
The machine-shaping for meeting blind hole spline is required, and high in machining efficiency, formed precision is good, and can completely retain metal streamline knot
Structure, improve product quality and shelf life.
For reaching above-mentioned purpose, the present invention provides following technical scheme：
A kind of blind hole rectangular spline cold-extrusion molding method, its manufacturing procedure is：Blanking → heating → pier base → thick the molding of forge hot
→ normalizing → ball blast → surface treatment → cold extrusion shaped；
Wherein, in the heating process, by blank heating to after 1100 DEG C, punch press pier base is recycled；
In the surface treatment procedure, using macromolecule Phosphating Solution, bonderizing is carried out to blank, so that blank epidermis is softened and moisten
Sliding；
In the cold extrusion operation, using cold extrusion molding mould, blank is carried out cold extrusion shaped.
Further, the cold extrusion molding mould includes upper bolster and die shoe, and the upper bolster includes connecting plate and upper
Pull head, the upper pull head is arranged on the connecting plate towards on the bottom surface of the die shoe, is provided with through institute in the upper bolster
Pull head and connecting plate the upper through hole coaxial with the upper pull head is stated, in the upper through hole, is provided with position limiting slide block；The pull-up
On head, set is equiped with the sliding sleeve being slidably matched with which, is provided with through the upper pull head between the sliding sleeve and the position limiting slide block
It is provided with row bar, and the upper pull head and is slidably matched with the row bar and so that the row bar is moved along the axis direction of upper pull head
Chute；
The core rod being provided with the upper through hole below positioned at the position limiting slide block, the core rod includes slippery fellow and the position positioned at upper end
In the spline forming convax mould of lower end, described foxy be slidably matched with the upper through hole, the spline forming convax mould and the slippery fellow
Between be provided with external diameter more than the upper through hole internal diameter limit shaft ring, and the limit shaft ring and described slippery fellow between be provided with external diameter
Changeover portion less than the upper through hole internal diameter；
The upper pull head annular is laid with positioned at its radial direction and can stretch into the clamp in the upper through hole, the clamp
The lower section of the chute is arranged on, the sliding sleeve inwall is provided with the slot to make way for coordinating with the clamp, and the clamp and institute
The spring being provided between pull head for driving the clamp to be moved radially outward is stated, and the radical length of the clamp is more than institute
State the radial thickness of pull head and less than or equal to the upper pull head radial thickness and resigning groove depth sum；
The lower through-hole coaxial with the upper through hole is provided with the die shoe, and the lower through-hole inner sleeve is equiped with product backing plate, institute
State product backing plate install towards on the top surface of the upper bolster be provided with lower mould inner sleeve, and the lower mould put suit be provided with for
Be fixed the lower moulded board being pressed on the die shoe, and the lower moulded board is fixedly mounted on the die shoe, the product
The extrusion chamber for placing workpiece blank is formed between product backing plate and lower mould inner sleeve.
Further, the clamp is provided with spherical end, and the both sides side wall of the slot to make way towards one end of the sliding sleeve
It is set to the inclined-plane for inclining.
Further, the side wall of the slot to make way respectively with the bottom land of the slot to make way and the interior walls be smooth mistake of the sliding sleeve
Cross.
Further, the clamp is provided with baffle plate, and on the upper pull head, annular is laid with bullet corresponding with the baffle plate
Spring groove, the spring is arranged between the spring groove and the baffle plate.
Further, the lock-screw being provided with the position limiting slide block for locking the row bar position.
Further, the pull-up head are provided with the counterbore for coordinating with the limit shaft ring to the bottom surface of the die shoe.
Further, the product backing plate includes and the adpting flange of the spacing cooperation of the die shoe and is sleeved on described lower logical
The bushing of in the hole, and the product backing plate is fixedly mounted on the die shoe by the adpting flange.
Further, in the thick molding procedure of the forge hot, using friction press or electric screw press, blank is carried out
The thick molding of forge hot；In the normalizing process, normalized treatment is carried out to blank using continuous guipure multipurpose furnace；The ball blast operation
In, ball blast is carried out using shot-blasting machine to blank, removes the table for producing in blank surface in the thick molding procedure of forge hot and normalizing process
Surface oxidized skin.
Further, described cold extrusion shaped, the cold extrusion molding mould is entered to blank on four-column hydraulic press
Row is cold extrusion shaped, and cold-stamped pressure is less than or equal to 20MP.
The beneficial effects of the present invention is：
Blind hole rectangular spline blank is first carried out forge hot dumming by the blind hole rectangular spline cold-extrusion molding method of the present invention, then
Carry out pre- front heat treatment（Isothermal normalizing）And surface treatment（Phosphatization）；Cold-extrusion shaping is carried out under room temperature；Which utilizes metal material
Plastic properties, first material is carried out forge hot, with the crude green body state needed for reaching, then crude green body is carried out normalizing（Annealing）, ball blast
With the core that meets product require with skin decarburization, reach metallographic structure needed for product；And face list processing is carried out to product（Phosphorus
Change）, upset crowded to reduce after frictional force of the product in extruding, at normal temperatures product blind hole spline position can be formed
Pressure, to reach size needed for product, precision, in this way, disclosure satisfy that rectangular spline cold extrusion using the technological process of the present invention
The technical purpose of molding.
In cold extrusion operation, using cold extrusion molding mould, during use, the workpiece blank of formation to be extruded is placed on crowded
Pressure intracavity, drives upper bolster to move down, and core rod contacts the extrusion molding that realizes to workpiece blank with workpiece blank, and its process is such as
Under：Core rod is subject to workpiece blank counteracting force upward sliding upwards, and spacing by position limiting slide block, and now the changeover portion of core rod is being just
To clamp；Upper bolster continues downward cold extrusion workpiece blank, and when sliding sleeve contact with lower mould inner sleeve, sliding sleeve is by acting on upwards
Power, drives sliding sleeve and position limiting slide block to move up with respect to upper bolster, and then drives clamp to stretch in through hole, until limit shaft
When ring is contacted with upper pull head, cold extrusion shaped complete；During the demoulding, upper bolster is driven to move up, core rod is applied by workpiece blank
Plus downward active force, but now clamp is stretched in through hole, and the slippery fellow of core rod is spacing with clamp to be coordinated and overcome downward power
Drive core rod to move up, and then easily core rod can be taken out from workpiece blank, then using being arranged on below die shoe
Push rod by lower through-hole by workpiece blank from extruding intracavity ejection, realize the technical purpose of the demoulding；In summary, cold using this
Extrusion molding dies, the machine-shaping that can not only meet blind hole spline is required, and high in machining efficiency, formed precision is good, and
Metal streamline construction, improve product quality and shelf life can completely be retained.
Description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is that the structure of the cold extrusion molding mould for adopting in blind hole rectangular spline cold-extrusion molding method embodiment of the present invention is shown
It is intended to；
Fig. 2 is the structural representation of upper mould.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art is permissible
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The blind hole rectangular spline cold-extrusion molding method of the present embodiment, its manufacturing procedure is：Blanking → heating → pier base →
Thick molding → normalizing → ball blast → the surface treatment of forge hot → cold extrusion shaped；
Wherein, in heating process, by blank heating to after 1100 DEG C, make blank Reducing distortion drag and overheated burning is prevented, then
Using punch press pier base；
In the thick molding procedure of forge hot, the thick molding of forge hot is carried out using friction press or electric screw press to blank, makes base
Material reaches required crude green body state；
In normalizing process, normalized treatment is carried out to blank using continuous guipure multipurpose furnace so as to the internal stress of blank is removed, reduce
The hardness of material, improves plasticity；
In ball blast operation, ball blast is carried out using shot-blasting machine to blank, remove in the thick molding procedure of forge hot and normalizing process in blank
The surface scale that surface produces；
In surface treatment procedure, using macromolecule Phosphating Solution, bonderizing is carried out to blank, so that blank epidermis is softened and lubricate；
In cold extrusion operation, using cold extrusion molding mould, blank is carried out cold extrusion shaped.
Specifically, the cold extrusion molding mould that the present embodiment is adopted, including upper bolster 1 and die shoe 16, upper bolster 1 includes
Connecting plate 2 and upper pull head 3, upper pull head 3 is arranged on connecting plate 2 towards on the bottom surface of die shoe 16, is provided with through upper in upper bolster 1
Pull head 3 and connecting plate 2 the upper through hole 4 coaxial with upper pull head 3, are provided with position limiting slide block 5 in upper through hole 4.Set installing on upper pull head 3
There is the sliding sleeve 6 being slidably matched with which, the row bar 7 being provided between sliding sleeve 6 and position limiting slide block 5 through upper pull head 3, and in upper pull head 3
Being provided with is slidably matched with row bar 7 and row bar 7 is made along the chute 8 of the axis direction movement of upper pull head 3, in this way, linchpin inner slide 5,
Sliding sleeve 6 and row bar 7 can be moved along the axis of upper pull head 3 together as entirety.
The core rod being provided with upper through hole 4 positioned at 5 lower section of position limiting slide block, core rod includes positioned at the slippery fellow 9 of upper end and is located at down
The spline forming convax mould 10 at end, foxy 9 are slidably matched with upper through hole 4, are provided with external diameter big between spline forming convax mould 10 and foxy 9
Mistake of the external diameter less than 4 internal diameter of upper through hole is provided between the limit shaft ring 11 of 4 internal diameter of upper through hole, and limit shaft ring 11 and foxy 9
Cross section 12.
3 annular of upper pull head is laid with positioned at its radial direction and can stretch into the clamp 13 in upper through hole 4, and clamp 13 sets
Put in the lower section of chute 8,6 inwall of sliding sleeve is provided with the slot to make way 14 for coordinating with clamp 13, and sets between clamp 13 and upper pull head 3
There is the spring 15 being moved radially outward for driving card 13, and the radical length of clamp 13 is more than the radial thickness of upper pull head 3
And less than or equal to 3 radial thickness of upper pull head and 14 depth sum of slot to make way, i.e., after clamp 13 departs from slot to make way 14, can stretch into
In through hole 4.
The lower through-hole 17 coaxial with upper through hole 4 is provided with die shoe 16,17 inner sleeve of lower through-hole is equiped with product backing plate 18, produces
Product backing plate 18 install towards on the top surface of upper bolster 1 be provided with lower mould inner sleeve 19, and lower mould inner sleeve 19 set be equiped with for by its
Fixation is pressed in lower moulded board 20 on die shoe 16, and lower moulded board 20 is fixedly mounted on die shoe 16, product backing plate 18 and under
The extrusion chamber for placing workpiece blank 21 is formed between mould inner sleeve 19.
Further, the clamp 13 of the present embodiment is provided with spherical end 13a, and the two of slot to make way 14 towards one end of sliding sleeve 6
Side side wall is set to the inclined-plane for inclining, the side wall of the slot to make way 14 of the present embodiment respectively with the bottom land and sliding sleeve 6 of slot to make way 14 in
Wall is seamlessly transitted, and is easy to drive clamp 13 to slide along 13 radial direction of upper pull head.
Further, clamp 13 is provided with baffle plate 22, and on upper pull head 13, annular is laid with spring groove corresponding with baffle plate 22
23, spring 15 is arranged between spring groove 23 and baffle plate 22, can apply uniform elastic force to clamp 13, prevents clamp 13 with pull-up
There is bite between 3.
Further, the lock-screw being provided with the position limiting slide block 5 of the present embodiment for 7 position of lock line bar；3 face of upper pull head
The counterbore 24 for coordinating with limit shaft ring 11 is provided with to the bottom surface of die shoe 16.
Further, product backing plate 18 includes adpting flange and the lining being sleeved in lower through-hole with the spacing cooperation of die shoe 16
Cover, and product backing plate is fixedly mounted on die shoe by adpting flange.
By extrusion molding dies are adopted, during use, the workpiece blank of formation to be extruded is placed on extruding intracavity, drives
Upper bolster is moved down, and core rod contacts the extrusion molding that realizes to workpiece blank with workpiece blank, and its process is as follows：Core rod is subject to
Workpiece blank counteracting force upward sliding upwards, and spacing by position limiting slide block, and now the changeover portion of core rod is just to clamp；Upper mould
Seat continues downward cold extrusion workpiece blank, and when sliding sleeve is contacted with lower mould inner sleeve, sliding sleeve is subject to active force upwards, drives sliding sleeve
Move up with respect to upper bolster with position limiting slide block, and then drive clamp to stretch in through hole, until limit shaft ring and upper pull head
During contact, cold extrusion shaped complete；During the demoulding, upper bolster is driven to move up, core rod is subject to the downward of workpiece blank applying
Active force, but now clamp is stretched in through hole, the slippery fellow of core rod is spacing with clamp coordinate overcome downward power drive core rod to
Upper movement, and then easily core rod can be taken out from workpiece blank, then passed through using the push rod being arranged on below die shoe
Lower through-hole realizes the technical purpose of the demoulding by workpiece blank from extruding intracavity ejection.In summary, using the extrusion molding dies
The machine-shaping that blind hole spline can not only be met is required, and high in machining efficiency, formed precision is good, and being capable of complete preserving capital
Category streamline construction, improve product quality and shelf life.
Blind hole rectangular spline blank is first carried out forge hot and slightly becomes by the blind hole rectangular spline cold-extrusion molding method of the present embodiment
Shape, then carry out pre- front heat treatment（Isothermal normalizing）And surface treatment（Phosphatization）；Cold-extrusion shaping is carried out under room temperature；Which utilizes metal
Material is first carried out forge hot, with the crude green body state needed for reaching by the plastic properties of material, then crude green body is carried out normalizing（Annealing）、
Ball blast with the core that meets product require with skin decarburization, reach metallographic structure needed for product；And product is carried out at the table of face
Reason（Phosphatization）, with reduce product extruding when frictional force after, by normal temperatures product blind hole spline position is formed
Upset extruding, to reach size needed for product, precision, in this way, disclosure satisfy that rectangular flower using the technological process of the present embodiment
The cold extrusion shaped technical purpose of key.
Embodiment described above is only the preferred embodiment that is lifted for absolutely proving the present invention, the protection model of the present invention
Enclose not limited to this.Equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, all in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (10)
1. a kind of blind hole rectangular spline cold-extrusion molding method, it is characterised in that：Its manufacturing procedure is：Blanking → heating → pier base
Thick molding → normalizing → ball blast → the surface treatment of → forge hot → cold extrusion shaped；
Wherein, in the heating process, by blank heating to after 1100 DEG C, punch press pier base is recycled；
In the surface treatment procedure, using macromolecule Phosphating Solution, bonderizing is carried out to blank, so that blank epidermis is softened and moisten
Sliding；
In the cold extrusion operation, using cold extrusion molding mould, blank is carried out cold extrusion shaped.
2. blind hole rectangular spline cold-extrusion molding method according to claim 1, it is characterised in that：Described cold extrusion shaped
Mould includes upper bolster and die shoe, and the upper bolster includes connecting plate and upper pull head, and the upper pull head is arranged on the connection
Plate face on the bottom surface of the die shoe, be provided with the upper bolster through the upper pull head and connecting plate and with the upper pull head
Coaxial upper through hole, is provided with position limiting slide block in the upper through hole；On the upper pull head, set is equiped with the sliding sleeve being slidably matched with which,
It is provided with the row bar being provided between the sliding sleeve and the position limiting slide block through the upper pull head, and the upper pull head and the row
Bar is slidably matched and makes the row bar along the chute of the axis direction movement of upper pull head；
The core rod being provided with the upper through hole below positioned at the position limiting slide block, the core rod includes slippery fellow and the position positioned at upper end
In the spline forming convax mould of lower end, described foxy be slidably matched with the upper through hole, the spline forming convax mould and the slippery fellow
Between be provided with external diameter more than the upper through hole internal diameter limit shaft ring, and the limit shaft ring and described slippery fellow between be provided with external diameter
Changeover portion less than the upper through hole internal diameter；
The upper pull head annular is laid with positioned at its radial direction and can stretch into the clamp in the upper through hole, the clamp
The lower section of the chute is arranged on, the sliding sleeve inwall is provided with the slot to make way for coordinating with the clamp, and the clamp and institute
The spring being provided between pull head for driving the clamp to be moved radially outward is stated, and the radical length of the clamp is more than institute
State the radial thickness of pull head and less than or equal to the upper pull head radial thickness and resigning groove depth sum；
The lower through-hole coaxial with the upper through hole is provided with the die shoe, and the lower through-hole inner sleeve is equiped with product backing plate, institute
State product backing plate install towards on the top surface of the upper bolster be provided with lower mould inner sleeve, and the lower mould put suit be provided with for
Be fixed the lower moulded board being pressed on the die shoe, and the lower moulded board is fixedly mounted on the die shoe, the product
The extrusion chamber for placing workpiece blank is formed between product backing plate and lower mould inner sleeve.
3. blind hole rectangular spline cold-extrusion molding method according to claim 2, it is characterised in that：The clamp is towards institute
The one end for stating sliding sleeve is provided with spherical end, and the both sides side wall of the slot to make way is set to the inclined-plane of inclination.
4. blind hole rectangular spline cold-extrusion molding method according to claim 3, it is characterised in that：The side of the slot to make way
Wall respectively with the bottom land of the slot to make way and the interior walls be smooth transition of the sliding sleeve.
5. the blind hole rectangular spline cold-extrusion molding method according to any one of claim 2-4, it is characterised in that：The card
Son is provided with baffle plate, and on the upper pull head, annular is laid with spring groove corresponding with the baffle plate, and the spring is arranged on institute
State between spring groove and the baffle plate.
6. blind hole rectangular spline cold-extrusion molding method according to claim 2, it is characterised in that：In the position limiting slide block
The lock-screw being provided with for locking the row bar position.
7. blind hole rectangular spline cold-extrusion molding method according to claim 2, it is characterised in that：Described pull-up head to
The bottom surface of the die shoe is provided with the counterbore for coordinating with the limit shaft ring.
8. blind hole rectangular spline cold-extrusion molding method according to claim 2, it is characterised in that：The product backing plate bag
Adpting flange and the bushing being sleeved in the lower through-hole with the spacing cooperation of the die shoe is included, and the product backing plate passes through
The adpting flange is fixedly mounted on the die shoe.
9. blind hole rectangular spline cold-extrusion molding method according to claim 1, it is characterised in that：The thick molding of the forge hot
In operation, the thick molding of forge hot is carried out using friction press or electric screw press to blank；In the normalizing process, adopt
Continuous guipure multipurpose furnace carries out normalized treatment to blank；In the ball blast operation, ball blast is carried out using shot-blasting machine to blank, remove
The surface scale for producing in blank surface in the thick molding procedure of forge hot and normalizing process.
10. blind hole rectangular spline cold-extrusion molding method according to claim 1, it is characterised in that：The cold-extruded is pressed into
Type, the cold extrusion molding mould is carried out on the four-column hydraulic press cold extrusion shaped, and cold-stamped pressure to blank
Less than or equal to 20MP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611014030.3A CN106424191B (en) | 2016-11-18 | 2016-11-18 | Blind hole rectangular spline cold-extrusion molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611014030.3A CN106424191B (en) | 2016-11-18 | 2016-11-18 | Blind hole rectangular spline cold-extrusion molding method |
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| CN106424191B CN106424191B (en) | 2018-06-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109043757A (en) * | 2018-06-08 | 2018-12-21 | 老凤祥东莞珠宝首饰有限公司 | Gold oil pressure reverse mould pendant circle hypervelocity marking molding machine |
| CN111992992A (en) * | 2020-08-21 | 2020-11-27 | 任奋 | Novel inner hexagonal plug screw blank forming process |
| CN113084067A (en) * | 2021-04-20 | 2021-07-09 | 宝鸡法士特齿轮有限责任公司 | Die and machining method for blind hole internal spline of part for medium and heavy vehicle |
| CN115415474A (en) * | 2022-09-05 | 2022-12-02 | 重庆旺德福机械有限公司 | Cold extrusion process for internal spline of high-hardness blind hole |
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