CN111215594A - Machining method for self-tapping threads of die castings - Google Patents
Machining method for self-tapping threads of die castings Download PDFInfo
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- CN111215594A CN111215594A CN202010136804.XA CN202010136804A CN111215594A CN 111215594 A CN111215594 A CN 111215594A CN 202010136804 A CN202010136804 A CN 202010136804A CN 111215594 A CN111215594 A CN 111215594A
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- Prior art keywords
- die
- self
- tapping
- thread
- casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2254—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies having screw-threaded die walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a method for processing self-tapping threads of die castings, which comprises the following steps: the die comprises a fixed part and a movable part, the die drawing angle of the movable part is calculated by measuring the size and the depth of the self-tapping bottom hole, and a volume groove is added at the bottom of the movable part; a sprue is arranged on the fixing part of the die, a layer of lubricant is sprayed on the cavity of the die, then the die is closed, and then the fixing part of the die is arranged on the die-casting equipment; injecting molten metal liquid from a pouring gate of a mold at a high speed, applying high pressure before solidification to enable a cavity of the mold to be fully cast with the molten metal liquid, and crystallizing and solidifying the metal liquid at the high pressure to form a die casting; after cooling, pushing out the die casting through a push rod of the die; during assembly, the threads are formed by self-tapping screws. The invention technically forms the hole in one step without post-processing, eliminates the risk of processing leakage, directly locks by using the self-tapping screw during assembly, saves time and labor and achieves the aim at one time.
Description
Technical Field
The invention relates to the technical field of machine manufacturing, in particular to a method for processing self-tapping threads of die castings.
Background
In the prior art, all aluminum alloy and zinc alloy die castings are provided with locking threaded holes by drilling or enlarging threaded bottom holes through a machine tool and then tapping in place through the machine tool or manually.
The locking screw hole on the foundry goods at present all realizes through the postprocessing, can have the risk of leaking the processing, and the screw thread intensity of processing out also has the defect, in order to increase intensity sometimes, still can install the steel wire swivel nut, wastes time and energy, and the processing cost is on the high side.
Disclosure of Invention
The invention mainly calculates the drawing angle of the hole by the size of the self-tapping thread and the depth of the thread, adds a section of guide at the hole opening, adds a volume groove at the bottom of the thread, and can directly calculate the size of the pin used for forming the hole on the die by the calculation, the die is directly formed on the product in the die-casting process, all thread bottom holes of the die-casting piece can be directly die-cast and formed by the die without independently processing the thread, thereby improving the production efficiency and reducing the processing cost, the thread is formed directly by self-tapping, and the clearance between the threaded hole and the screw is eliminated in the thread generating process with certain extrusion and cutting, and the locking strength is higher than that of the common thread and the screw.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for processing self-tapping threads of die castings comprises the following steps:
a) firstly, preparing a die, wherein the die comprises a fixed part and a movable part, calculating a die drawing angle of a thread locking hole by measuring the size of a self-tapping thread bottom hole and the depth of the thread bottom hole, and adding a volume groove at the bottom of the thread locking hole to manufacture the movable part of the die;
b) adding a section of guide at the orifice of the thread locking hole;
c) a sprue is arranged on the fixed part of the die, the movable part of the die is matched with the fixed part, a layer of lubricant is sprayed on the cavity of the die, then the die is closed, and then the fixed part of the die is arranged on the die-casting equipment;
d) preparing metal smelting liquid while installing the fixed part of the die;
e) injecting molten metal liquid from a pouring gate of a mold at a high speed, applying high pressure before solidification to enable a cavity of the mold to be fully cast with the molten metal liquid, and crystallizing and solidifying the metal liquid at the high pressure to form a die casting;
f) after cooling, pushing out the die casting through a push rod of the die, and shaping;
g) and finally, during assembly, the self-tapping screw enters the thread locking hole of the die casting to form the self-tapping thread, so that the screw is locked.
Preferably, the elevated pressure is from 10 to 175 megapascals.
Further, the high pressure is 80 MPa
Preferably, the movable portion is T-shaped.
Preferably, the lubricant is a water-based lubricant.
Preferably, the high speed is typically in the range of 10-50 m/s.
Still further, the speed is 30 m/s.
Preferably, the die casting device is an injection molding device.
Preferably, the molten metal is an aluminum alloy.
Through the technical scheme, the die drawing angle of the hole is calculated mainly through the size of the self-tapping thread and the depth of the thread, a section of guide is added at the hole opening, the volume groove is added at the bottom of the thread, the size of the pin used for forming the hole can be directly calculated on the die through the calculation, the die is directly formed on a product in the die-casting process, all thread bottom holes of a die-casting piece can be directly die-cast and formed through the die without independently processing the thread, the production efficiency is improved, the processing cost is reduced, the thread is self-tapping formed, certain extrusion and cutting are carried out in the thread generating process, the gap between a threaded hole and the screw is eliminated, and the strength is higher than the strength of locking a common thread and the screw.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a process according to the present invention;
FIG. 2 is a schematic structural view of a mold pin according to the present invention;
effective length L of thread, maximum value D1 of thread bottom diameter, minimum value D2 of thread bottom diameter, volume groove depth L1 of die casting bottom, orifice guide 1 and drawing angle α of hole
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the attached drawings, the processing method of the self-tapping thread of the die casting comprises the following steps:
a) firstly, preparing a die, wherein the die comprises a fixed part and a movable part, calculating a die drawing angle of a thread locking hole by measuring the size of a self-tapping thread bottom hole and the depth of the thread bottom hole, and adding a volume groove at the bottom of the thread locking hole to manufacture the movable part of the die;
b) adding a section of guide at the orifice of the thread locking hole;
c) a sprue is arranged on the fixed part of the die, the movable part of the die is matched with the fixed part, a layer of lubricant is sprayed on the cavity of the die, then the die is closed, and then the fixed part of the die is arranged on the die-casting equipment;
d) preparing metal smelting liquid while installing the fixed part of the die;
e) injecting molten metal liquid from a pouring gate of a mold at a high speed, applying high pressure before solidification to enable a cavity of the mold to be fully cast with the molten metal liquid, and crystallizing and solidifying the metal liquid at the high pressure to form a die casting;
f) after cooling, pushing out the die casting through a push rod of the die, and shaping;
g) and finally, during assembly, the self-tapping screw enters the thread locking hole of the die casting to form the self-tapping thread, so that the screw is locked.
Preferably, the elevated pressure is from 10 to 175 megapascals.
Further, the high pressure is 80 MPa
Preferably, the movable portion is T-shaped.
Preferably, the lubricant is a water-based lubricant.
Further, the water-based lubricant is water-blended oil.
Preferably, the high speed is typically in the range of 10-50 m/s.
Still further, the speed is 30 m/s.
Preferably, the die casting device is an injection molding device.
Preferably, the molten metal is an aluminum alloy.
the size of a pin used for a forming hole is calculated by measuring the effective length L of the internal thread of the die casting, the maximum value D1 of the thread bottom diameter, the minimum value D2 of the thread bottom diameter and the depth L1 of the volume groove at the bottom of the die casting according to an angle calculation formula tg α ═ D1-D2)/L, and the die casting is formed through die casting of a die.
The high pressure injects the molten metal liquid very quickly into the mold so that the molten metal fills the entire mold before any portion solidifies. In this way, surface discontinuities can be avoided even for thin-walled portions that are difficult to fill.
The threads in the die casting are formed in a self-tapping mode, certain extrusion and cutting are carried out in the thread generating process, gaps between the threaded holes and the screws are eliminated, and the strength of the die casting is higher than that of common threads and screw locking.
Through the technical scheme, the die drawing angle of the hole is calculated mainly through the size of the self-tapping thread and the depth of the thread, a section of guide is added at the hole opening, the volume groove is added at the bottom of the thread, the size of the pin used for forming the hole can be directly calculated on the die through the calculation, the die is directly formed on a product in the die-casting process, all thread bottom holes of a die-casting piece can be directly die-cast and formed through the die without independently processing the thread, the production efficiency is improved, the processing cost is reduced, the thread is directly formed, certain extrusion and cutting are carried out in the thread generating process, the gap between a threaded hole and the screw is eliminated, and the strength is higher than that of the common thread and screw locking.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for processing self-tapping threads of die castings is characterized by comprising the following steps:
a) firstly, preparing a die, wherein the die comprises a fixed part and a movable part, calculating a die drawing angle of a thread locking hole by measuring the size of a self-tapping thread bottom hole and the depth of the thread bottom hole, and adding a volume groove at the bottom of the thread locking hole to manufacture the movable part of the die;
b) adding a section of guide at the orifice of the thread locking hole;
c) a sprue is arranged on the fixed part of the die, the movable part of the die is matched with the fixed part, a layer of lubricant is sprayed on the cavity of the die, then the die is closed, and then the fixed part of the die is arranged on the die-casting equipment;
d) preparing metal smelting liquid while installing the fixed part of the die;
e) injecting molten metal liquid from a pouring gate of a mold at a high speed, applying high pressure before solidification to enable a cavity of the mold to be fully cast with the molten metal liquid, and crystallizing and solidifying the metal liquid at the high pressure to form a die casting;
f) after cooling, pushing out the die casting through a push rod of the die, and shaping;
g) and finally, when the die casting is assembled, the self-tapping screw enters the thread locking hole of the die casting to form the self-tapping thread, so that the screw is locked.
2. The die casting self-tapping machining method according to claim 1, wherein the high pressure is 10 to 175 mpa.
3. The die casting self-tapping machining method according to claim 1, wherein the movable portion is T-shaped.
4. The die casting self-tapping thread machining method according to claim 1, wherein the lubricant is a water-based lubricant.
5. A method of die casting self-tapping threads, as claimed in claim 1, wherein said high speed is generally in the range of 10-50 m/sec.
6. The method of processing self-tapping threads of a die casting according to claim 1, wherein the die casting device is a hot die casting device.
7. A method of processing self-tapping threads for die castings according to claim 1, wherein the molten metal is an aluminum alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010136804.XA CN111215594A (en) | 2020-03-02 | 2020-03-02 | Machining method for self-tapping threads of die castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010136804.XA CN111215594A (en) | 2020-03-02 | 2020-03-02 | Machining method for self-tapping threads of die castings |
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| Publication Number | Publication Date |
|---|---|
| CN111215594A true CN111215594A (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010136804.XA Pending CN111215594A (en) | 2020-03-02 | 2020-03-02 | Machining method for self-tapping threads of die castings |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040098860A1 (en) * | 2001-08-17 | 2004-05-27 | Alan Britt | Cylinder head and crankcase manufacturing and assembly techniques |
| CN204043576U (en) * | 2014-07-18 | 2014-12-24 | 宁波吉烨汽配模具有限公司 | A kind of feeler gauge of the taper hole internal diameter for detecting designated depth |
| CN105458208A (en) * | 2015-12-08 | 2016-04-06 | 芜湖求精紧固件有限公司 | Die casting method for die-casting fitting |
| CN108350921A (en) * | 2015-11-19 | 2018-07-31 | 拜尔·米歇尔斯有限责任两合公司 | Particularly for using the form thread in light metal or tapping screw thread screw |
| CN108758319A (en) * | 2018-06-27 | 2018-11-06 | 青岛日建机电有限公司 | A kind of standard aluminum threeway and its manufacture craft |
-
2020
- 2020-03-02 CN CN202010136804.XA patent/CN111215594A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040098860A1 (en) * | 2001-08-17 | 2004-05-27 | Alan Britt | Cylinder head and crankcase manufacturing and assembly techniques |
| CN204043576U (en) * | 2014-07-18 | 2014-12-24 | 宁波吉烨汽配模具有限公司 | A kind of feeler gauge of the taper hole internal diameter for detecting designated depth |
| CN108350921A (en) * | 2015-11-19 | 2018-07-31 | 拜尔·米歇尔斯有限责任两合公司 | Particularly for using the form thread in light metal or tapping screw thread screw |
| CN105458208A (en) * | 2015-12-08 | 2016-04-06 | 芜湖求精紧固件有限公司 | Die casting method for die-casting fitting |
| CN108758319A (en) * | 2018-06-27 | 2018-11-06 | 青岛日建机电有限公司 | A kind of standard aluminum threeway and its manufacture craft |
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Application publication date: 20200602 |