Pretreatment method for improving metal die casting screw column sand hole and metal die casting

Abstract

The invention provides a pretreatment method for improving a metal die casting screw column sand hole and a metal die casting. The metal die casting sand hole pretreatment method based on the stud friction forming device comprises the steps that the top of a stud of a metal die casting is sleeved with the profiling lantern ring; a rotary welding head of the friction welding machine is driven to extend into an inner ring of the profiling lantern ring; and when the rotary welding head of the friction welding machine abuts against the top of the screw column of the metal die casting, the rotary welding head of the friction welding machine is driven to rotate relative to the profiling lantern ring so as to rub and compact the top of the screw column of the metal die casting. According to the pretreatment method for improving the sand hole of the screw column of the metal die casting, heat is generated through friction between the rotary welding head of the friction welding machine and the top of the screw column of the metal die casting, so that the top of the screw column of the metal die casting is melted to form a compact structure; and sand holes in the top of the screw column of the metal die casting can be effectively eliminated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of metal die casting, and in particular to a pretreatment method for improving sand holes of screw columns of metal die castings and a metal die casting. Background Art

[0002] In the metal die-casting process, due to product structure limitations, the top of the screw column on the metal die-casting is prone to defects such as entrapped air, cold shut, and sand holes. Among them, sand holes will cause the texture of the top of the screw column to shrink, making the threaded hole on the top of the screw column low in structural strength, and the threaded hole is prone to rot when in use. In order to reduce the occurrence of the above situation, some manufacturers have made further research and development.

[0003] For example, Chinese patent document CN207464163U discloses an improved threaded hole sand hole mold insert core pulling structure, which includes a front mold core, a rear mold core and a product. The front mold core is arranged above the rear mold core, and the product is cast and formed between the front mold core and the rear mold core. An insert core is embedded in the interior of the rear mold core, and three exhaust grooves are arranged on the surface of the insert core.

[0004] However, the above-mentioned design of improving the core pulling structure of the threaded hole sand hole mold insert has the following problems:

[0005] The above-mentioned insert core pulling structure for improving threaded hole sand hole mold can improve the defects of sand holes by filling and exhausting through an insert core with an exhaust groove. However, in actual applications, the insert core is not only easy to break, but the molten metal is also easy to enter the exhaust groove of the insert core and cause blockage. The insert core needs to be replaced after breaking or being blocked. The process of replacing the insert core is time-consuming, which can easily slow down production efficiency. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a method for pretreating sand holes in screw columns of metal die castings and a metal die casting that can reduce sand holes and improve the top structural strength of the screw columns of metal die castings.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A method for preprocessing sand holes of metal die castings based on a screw column friction forming device is implemented by using the screw column friction forming device, and the screw column friction forming device comprises:

[0009] Friction welding machine;

[0010] A contoured collar, which is used to be sleeved on the top of a screw column of a metal die casting;

[0011] The rotating welding head of the friction welding machine extends into the inner ring of the contoured collar, and the rotating welding head of the friction welding machine is used to abut against the top of the screw column of the metal die casting;

[0012] The metal die casting sand hole pretreatment method based on the screw column friction forming device includes the following:

[0013] The contoured collar is sleeved on the top of the screw column of the metal die casting;

[0014] Driving the rotating welding head of the friction welding machine to extend into the inner ring of the contoured sleeve;

[0015] When the rotating welding head of the friction welding machine abuts against the top of the screw column of the metal die casting, the rotating welding head of the friction welding machine is driven to rotate relative to the contoured collar to frictionally compact the top of the screw column of the metal die casting.

[0016] In one embodiment, the contoured collar is sleeved on the top of the screw column of the metal die casting, specifically:

[0017] 3 / 4 of the inner ring of the profiling ring is sleeved on the top of the screw column of the metal die casting, and 1 / 4 of the inner ring of the profiling ring is protruded and surrounds the top of the screw column.

[0018] In one embodiment, the driving of the rotating welding head of the friction welding machine to rotate relative to the contoured collar is specifically:

[0019] The rotating welding head of the friction welding machine is driven to rotate clockwise relative to the contoured sleeve ring.

[0020] In one embodiment, the number of clockwise rotations of the rotating welding head of the friction welding machine relative to the contoured collar is an odd number.

[0021] In one embodiment, the driving of the rotating welding head of the friction welding machine to rotate relative to the contoured collar is specifically:

[0022] The rotating welding head of the friction welding machine is driven to rotate counterclockwise relative to the contoured sleeve ring.

[0023] In one of the embodiments, the number of counterclockwise rotations of the rotating welding head of the friction welding machine relative to the contoured collar is an even number.

[0024] In one embodiment, the method of driving the rotating welding head of the friction welding machine to rotate relative to the contoured collar comprises:

[0025] The rotating welding head is driven to move vertically toward the top of the screw column of the metal die casting.

[0026] In one embodiment, before the contoured collar is sleeved on the top of the screw column of the metal die casting, the following steps are also included:

[0027] The metal die casting is fixed on a machine table.

[0028] In one embodiment, the diameter of the inner ring of the contoured collar gradually decreases from one end close to the top of the screw column of the metal die casting toward the friction welding machine.

[0029] A metal die casting has a screw column protruding from the metal die casting, and the screw column is processed and formed by the metal die casting sand hole pretreatment method based on the screw column friction forming device of any of the above embodiments.

[0030] Compared with the prior art, the present invention has at least the following advantages:

[0031] 1) The profiling ring is sleeved on the top of the screw column of the metal die casting, so that the top of the screw column of the metal die casting extends into the inner ring of the profiling ring, and the rotating welding head of the friction welding machine is driven to extend into the inner ring of the profiling ring, so that the rotating welding head of the friction welding machine and the top of the screw column of the metal die casting can contact each other under the guidance of the inner ring wall of the profiling ring. When the rotating welding head of the friction welding machine abuts against the top of the screw column of the metal die casting, the rotating welding head of the friction welding machine is rotated relative to the profiling ring, so that the rotating welding head of the friction welding machine and the top of the screw column of the metal die casting generate heat by friction, and the heat melts the top of the screw column of the metal die casting, and the top of the screw column of the metal die casting is formed into a dense structure through the pressing of the rotating welding head of the friction welding machine, so that the threaded hole opened at the top of the screw column has high structural strength and is more durable.

[0032] 2) Compared with the prior art, the threaded hole sand hole mold insert core pulling structure is improved, and the metal die casting sand hole pretreatment method based on the screw column friction forming device is used to treat the top of the screw column of the metal die casting, so that the friction between the rotating welding head of the friction welding machine and the top of the screw column of the metal die casting generates heat, so that the top of the screw column of the metal die casting is melted to form a dense structure, which can effectively eliminate the sand holes on the top of the screw column of the metal die casting, and at the same time, there is no breakage or blockage of the insert core. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a flow chart of a method for preprocessing sand holes of metal die castings based on a screw column friction forming device according to an embodiment of the present disclosure;

[0035] Figure 2 This is a schematic diagram of a screw column friction forming device according to another embodiment of the present disclosure being applied to a metal die casting;

[0036] Figure 3 for Figure 2 A partial enlarged view shown in the middle A;

[0037] Figure 4 This is a schematic diagram of a screw column friction forming device according to another embodiment of the present disclosure being applied to a metal die casting;

[0038] Figure 5 for Figure 4 The cross section cut by the middle straight line B;

[0039] Figure 6 for Figure 4 The cross section cut by the middle straight line C;

[0040] Figure 7 This is a schematic diagram of sand holes appearing in a screw column of a metal die-casting according to yet another embodiment of the present disclosure.

[0041] Figure numerals: 10, screw column friction forming device; 100, friction welding machine; 110, rotating welding head; 1110, friction head; 1111, piercing head; 1112, spreading part; 200, contoured ring; 210, handle; 220, outer ring; 230, inner ring; 2310, first half ring; 2320, second half ring; 240, screw; 250, exhaust groove; 20, metal die casting; 2010, screw column. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0046] like Figure 1 and Figure 2 As shown, the present disclosure relates to a method for preprocessing sand holes of metal die castings based on a screw column friction forming device. In one embodiment, the method for preprocessing sand holes of metal die castings based on a screw column friction forming device includes sleeve-mounting the contoured collar 200 on the top of the screw column 2010 of the metal die casting 20; driving the rotating welding head 110 of the friction welding machine 100 to extend into the inner ring of the contoured collar 200; when the rotating welding head 110 of the friction welding machine 100 abuts against the top of the screw column 2010 of the metal die casting 20, driving the rotating welding head 110 of the friction welding machine 100 to rotate relative to the contoured collar 200 to frictionally compact the top of the screw column 2010 of the metal die casting 20.

[0047] It can be understood that by sleeve-arranging the profiling collar 200 on the top of the screw column 2010 of the metal die casting 20, the top of the screw column 2010 of the metal die casting 20 is extended into the inner ring of the profiling collar 200, and by driving the rotating welding head 110 of the friction welding machine 100 to extend into the inner ring of the profiling collar 200, the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 can contact each other under the guidance of the inner ring wall of the profiling collar 200. When the rotating welding head 110 of the friction welding machine 100 abuts against the metal die casting 2 0, the rotating welding head 110 of the friction welding machine 100 is rotated relative to the contoured collar 200, so that the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 generate heat by friction, and the heat melts the top of the screw column 2010 of the metal die casting 20, and the top of the screw column 2010 of the metal die casting 20 is formed into a dense structure through the pressure of the rotating welding head 110 of the friction welding machine 100, so that the threaded hole opened on the top of the screw column 2010 has high structural strength and is more durable.

[0048] It can be understood that compared with the prior art, the improved threaded hole sand hole mold insert core pulling structure, the above-mentioned metal die-casting sand hole pretreatment method based on the screw column friction forming device is used to treat the top of the screw column 2010 of the metal die-casting 20, so that the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die-casting 20 generates heat, so that the top of the screw column 2010 of the metal die-casting 20 is melted to form a dense structure, which can effectively eliminate the sand holes on the top of the screw column 2010 of the metal die-casting 20. At the same time, there is no situation where the insert core is broken or blocked, thereby avoiding the time waste caused by replacing the insert core, and can effectively improve production efficiency.

[0049] See also Figure 1, which is a flow chart of the method for pre-treating sand holes in metal die castings based on the screw column friction forming device of this embodiment. The screw column friction forming device 10 comprises a friction welding machine 100 and a contoured collar 200; the contoured collar 200 is used to be sleeved on the top of the screw column 2010 of the metal die casting 20; the rotating welding head 110 of the friction welding machine 100 extends into the inner ring of the contoured collar 200, and the rotating welding head 110 of the friction welding machine 100 is used to abut against the top of the screw column 2010 of the metal die casting 20. It can be understood that the screw column friction forming device 10 mentioned above enables the profiling ring 200 to be sleeved on the top of the screw column 2010 of the metal die casting 20, so that the rotating welding head 110 of the friction welding machine 100 can accurately abut against the top of the screw column 2010 of the metal die casting 20 through the guiding effect of the inner ring of the profiling ring 200, and by rotating the rotating welding head 110 of the friction welding machine 100 relative to the profiling ring 200, the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 generates heat, and the heat melts the top of the screw column 2010 of the metal die casting 20, and the top of the screw column 2010 of the metal die casting 20 is formed into a dense structure through the pressure of the rotating welding head 110 of the friction welding machine 100, so that the threaded hole opened at the top of the screw column 2010 has high structural strength and is more durable. The structural diagram of the screw column friction forming device 10 is shown in the attached Figure 2 .

[0050] The metal die casting sand hole pretreatment method based on the screw column friction forming device includes part or all of the following steps.

[0051] S100 : Sleeve the contoured collar 200 onto the top of the screw column 2010 of the metal die casting 20 .

[0052] In this embodiment, the inner ring of the contoured ring 200 is adapted to the shape of the screw column 2010 of the metal die casting 20. When the contoured ring 200 is put down from the top of the screw column 2010 of the metal die casting 20, the top peripheral wall of the screw column 2010 of the metal die casting 20 will support the inner ring wall of the contoured ring 200, so that the contoured ring 200 is suspended on the top of the screw column 2010 of the metal die casting 20.

[0053] S200 : driving the rotating welding head 110 of the friction welding machine 100 to extend into the inner ring of the contoured collar 200 .

[0054] In this embodiment, by driving the rotating welding head 110 of the friction welding machine 100 to extend into the inner ring of the profiling ring 200, the rotating welding head 110 of the friction welding machine 100 will be displaced toward the top of the screw column 2010 of the metal die-casting 20 along the inner ring wall of the profiling ring 200 under the guidance of the inner ring wall of the profiling ring 200, so that the rotating welding head 110 can be abutted against the center position of the top of the screw column 2010 of the metal die-casting 20. At the same time, the profiling ring 200 can restrain the rotating welding head 110 when the rotating welding head 110 rotates, so as to avoid the rotating welding head 110 from being displaced during the process of rotating and rubbing the top of the screw column 2010 of the metal die-casting 20.

[0055] S300: When the rotating welding head 110 of the friction welding machine 100 abuts against the top of the screw column 2010 of the metal die-casting 20, the rotating welding head 110 of the friction welding machine 100 rotates relative to the contoured ring 200 to frictionally compact the top of the screw column 2010 of the metal die-casting 20.

[0056] In this embodiment, when the rotating welding head 110 of the friction welding machine 100 abuts against the top of the screw column 2010 of the metal die-casting 20, the rotating welding head 110 of the friction welding machine 100 is rotated relative to the contoured ring 200, so that the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die-casting 20 generates heat, and the heat melts the top of the screw column 2010 of the metal die-casting 20, and the top of the screw column 2010 of the metal die-casting 20 is formed into a dense structure through the pressure of the rotating welding head 110 of the friction welding machine 100, so that the threaded hole opened on the top of the screw column 2010 has high structural strength and is more durable.

[0057] Combination Figure 4 As shown, in one embodiment, S100: the contoured collar 200 is sleeved on the top of the screw column 2010 of the metal die casting 20, specifically:

[0058] 3 / 4 of the inner ring of the profiling ring 200 is sleeved on the top of the screw column 2010 of the metal die casting 20 , and 1 / 4 of the inner ring of the profiling ring 200 protrudes and surrounds the top of the screw column 2010 . It can be understood that by making 3 / 4 of the inner ring of the profiling ring 200 sleeved on the top of the screw column 2010 of the metal die casting 20, the inner ring of the profiling ring 200 can be securely installed on the top of the screw column 2010 of the metal die casting 20, and by making 1 / 4 of the inner ring of the profiling ring 200 protrude and surround the top of the screw column 2010, the rotating welding head 110 of the friction welding machine 100 can abut against the top of the screw column 2010 of the metal die casting 20 under the guiding action of the inner ring of the profiling ring 200, and at the same time, it can constrain the top of the screw column 2010 of the metal die casting 20 to prevent the top of the screw column 2010 of the metal die casting 20 from being deformed in the circumferential direction due to force.

[0059] In one embodiment, the driving of the rotating welding head 110 of the friction welding machine 100 to rotate relative to the contoured collar 200 is specifically as follows:

[0060] The rotating welding head 110 of the friction welding machine 100 is driven to rotate clockwise relative to the contoured collar 200. It can be understood that by driving the rotating welding head 110 of the friction welding machine 100 to rotate clockwise relative to the contoured collar 200, the top of the screw column 2010 of the metal die-casting 20 is only subjected to clockwise stress when rubbing against the rotating welding head 110 of the friction welding machine 100, thereby avoiding deformation of the top of the screw column 2010 of the metal die-casting 20 in multiple directions, and is suitable for die-casting metal materials such as zinc, copper, and aluminum.

[0061] In one embodiment, the rotating welding head 110 of the friction welding machine 100 rotates an odd number of revolutions clockwise relative to the contoured collar 200. It can be understood that by rotating the rotating welding head 110 of the friction welding machine 100 clockwise relative to the contoured collar 200 for an odd number of revolutions, for example, the rotating welding head 110 of the friction welding machine 100 rotates clockwise relative to the contoured collar 200 at 511 rpm, 555 rpm, or 599 rpm, etc., the metal die casting 20, such as zinc, copper, or aluminum, can be prevented from being excessively melted.

[0062] In one embodiment, the driving of the rotating welding head 110 of the friction welding machine 100 to rotate relative to the contoured collar 200 is specifically as follows:

[0063] The rotating welding head 110 of the friction welding machine 100 is driven to rotate counterclockwise relative to the contoured collar 200. It can be understood that by driving the rotating welding head 110 of the friction welding machine 100 to rotate counterclockwise relative to the contoured collar 200, the top of the screw column 2010 of the metal die-casting 20 is only subjected to counterclockwise stress when rubbing against the rotating welding head 110 of the friction welding machine 100, thereby avoiding deformation of the top of the screw column 2010 of the metal die-casting 20 in multiple directions, and is suitable for die-casting metal materials such as lead and tin.

[0064] In one embodiment, the rotating welding head 110 of the friction welding machine 100 rotates counterclockwise by an even number of revolutions relative to the contoured collar 200. It can be understood that by rotating the rotating welding head 110 of the friction welding machine 100 counterclockwise by an odd number of revolutions relative to the contoured collar 200, for example, the rotating welding head 110 of the friction welding machine 100 rotates counterclockwise by 520 rpm, 540 rpm or 580 rpm relative to the contoured collar 200, excessive melting of the metal die casting 20, such as lead or tin, can be avoided.

[0065] In one embodiment, the driving of the rotating welding head 110 of the friction welding machine 100 to rotate relative to the contoured collar 200 comprises:

[0066] The rotating welding head 110 is driven to move vertically toward the top of the screw column 2010 of the metal die casting 20. It can be understood that by pressing the rotating welding head 110 downward, the top of the screw column 20102010 of the metal die casting 2020 forms a dense structure, so that the threaded hole opened on the top of the screw column 20102010 has high structural strength and is more durable.

[0067] In one embodiment, before the contoured collar 200 is sleeved on the top of the screw column 2010 of the metal die casting 20, the following steps are also included:

[0068] Fix the metal die casting 20 on the machine platform. It is understood that by fixing the metal die casting 20 on the machine platform, the metal die casting 20 can be fixed more securely, and the metal die casting 20 can be prevented from loosening during the pressing and friction process of the rotating welding head 110 of the friction welding machine 100.

[0069] In one embodiment, the friction welding machine 100 includes a host, a controller and the rotating welding head 110, wherein the controller is built into the host; the rotating welding head 110 is rotatably disposed on the host and is electrically connected to the controller. It can be understood that by rotatably disposing the rotating welding head 110 on the host, since the rotating welding head 110 is electrically connected to the controller, the rotation speed of the rotating welding head 110 can be controlled by the controller, that is, the heat generated by the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 can be changed by adjusting the rotation speed of the rotating welding head 110.

[0070] In one embodiment, the electrical connection may be in various forms such as wired connection, wireless connection, etc. It is understood that the wired connection may be a wire connection or a circuit board connection, etc., and the wireless connection may be a Bluetooth connection or a WIFI (Wireless Fidelity) connection, etc. The specific connection method is not limited, and those skilled in the art may also adjust it as needed.

[0071] Generally, when the rotating welding head 110 rotates and rubs the top of the screw column 2010 of the metal die-casting 20, as the temperature between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 gradually accumulates, the top of the screw column 2010 of the metal die-casting 20 will melt and soften. When the top of the screw column 2010 of the metal die-casting 20 is too soft, the pressure of the rotating welding head 110 on the top of the screw column 2010 of the metal die-casting 20 is too large, which can easily cause the top of the screw column 2010 of the metal die-casting 20 to deform and be damaged. When the top of the screw column 2010 of the metal die-casting 20 is not soft enough, the pressure of the rotating welding head 110 on the top of the screw column 2010 of the metal die-casting 20 is too small, and it is difficult to deform and compact the top of the screw column 2010 of the metal die-casting 20.

[0072] In one embodiment, step S300: when the rotating welding head 110 of the friction welding machine 100 abuts against the top of the screw column 2010 of the metal die casting 20, the rotating welding head 110 of the friction welding machine 100 rotates relative to the contoured collar 200 to frictionally compact the top of the screw column 2010 of the metal die casting 20, specifically:

[0073] S301, obtaining the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20;

[0074] S302, obtaining a current friction temperature between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 according to the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20;

[0075] S303, calculating the difference between the current friction temperature and the preset friction temperature to obtain the current pressure temperature difference;

[0076] S304, detecting whether the current pressing temperature difference is greater than the preset pressing temperature difference;

[0077] S305 , when the current pressing temperature difference is greater than the preset pressing temperature difference, reducing the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 .

[0078] It can be understood that by obtaining the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20, since the materials of the metal die casting 20, the rotating welding head 110 and the contour ring 200 are fixed during production, for example, in some embodiments, the metal die casting 20 is made of aluminum alloy, and the rotating welding head 110 and the contour ring 200 are made of iron, that is, the friction coefficient between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 is fixed, and at the same time, since the process and the process are fixed, that is, the friction coefficient between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 is fixed. The rotation speed of the rotating welding head 110, the contact time and contact area of ​​the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 are fixed, so that the current friction temperature between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 can be obtained through the top contact pressure, that is, the melting and softening degree of the top of the screw column 2010 of the metal die casting 20 can be obtained through the current friction temperature, and the preset friction temperature is the temperature at which the top of the screw column 2010 of the metal die casting 20 can just be The temperature of the rotating welding head 110 pressing the forming part can be compared with the preset pressing temperature difference. When the current pressing temperature difference is greater than the preset pressing temperature difference, it indicates that the temperature generated by the friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 is too high, that is, it indicates that there is excessive friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20. By reducing the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20, the friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 can be effectively reduced. The friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 can be reduced, thereby slowing down the melting and softening degree of the top of the screw column 2010 of the metal die-casting 20, and at the same time reducing the deformation degree of the top of the screw column 2010 of the metal die-casting 20, which can effectively prevent the rotating welding head 110 from excessively pressing the top of the screw column 2010 of the metal die-casting 20 to cause excessive deformation, and finally prevent the top of the screw column 2010 of the metal die-casting 20 from being damaged during the pressing process of the rotating welding head 110.

[0079] Specifically, the preset pressing temperature difference is 0°C, that is, when the current pressing temperature difference is greater than 0°C, the pressing pressure on the top of the column can be reduced by reducing the rotation speed of the rotating welding head 110, so that the current friction temperature can be reduced to the preset friction temperature. At this time, the pressing pressure of the rotating welding head 110 on the top of the screw column 2010 of the metal die-casting 20 can be reduced to avoid excessive deformation of the top of the screw column 2010 of the metal die-casting 20 caused by the rotating welding head 110.

[0080] When the current pressing temperature difference is less than the preset pressing temperature difference, the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 is increased.

[0081] In this embodiment, the current pressing temperature difference is less than the preset pressing temperature difference, indicating that the temperature generated by the friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 is too low, that is, the friction strength between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 is insufficient. By increasing the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20, the degree of friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 can be effectively enhanced, thereby accelerating the melting and softening degree of the top of the screw column 2010 of the metal die-casting 20, and at the same time, the top of the screw column 2010 of the metal die-casting 20 can be compacted faster.

[0082] When the current pressing temperature difference is equal to the preset pressing temperature difference, the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die casting 20 is kept unchanged.

[0083] In this embodiment, the current pressing temperature difference is equal to the preset pressing temperature difference, indicating that the temperature generated by the friction between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 is close to the preset friction temperature, that is, the melting and softening of the top of the screw column 2010 of the metal die-casting 20 can just be pressed and formed by the rotating welding head 110. Keeping the contact pressure between the rotating welding head 110 and the top of the screw column 2010 of the metal die-casting 20 unchanged can enable the rotating welding head 110 to more smoothly compact the top of the screw column 2010 of the metal die-casting 20, and avoid excessive pressing of the rotating welding head 110 or excessive melting and softening of the top of the screw column 2010 of the metal die-casting 20.

[0084] Combination Figure 4 and Figure 5 As shown, conventionally, the peripheral side of the top of the screw column 2010 of the metal die casting 20 is easy to protrude into the gap to form a flash during the friction process. Excessive flash is easy to affect the matching accuracy between parts. In order to reduce the formation of flash, the contoured ring 200 is usually made to be in close contact with the peripheral side of the top of the screw column 2010 of the metal die casting 20. As a result, when the rotating welding head 110 of the friction welding machine 100 presses against the top of the screw column 2010 of the metal die casting 20, the gas in the sand hole at the top of the screw column 2010 of the metal die casting 20 is difficult to be discharged smoothly.

[0085] In order to reduce flash and facilitate exhaust, in one embodiment, the inner ring wall of the profiling collar 200 is provided with a plurality of exhaust grooves 250 spaced apart along the circumferential direction, one end of each exhaust groove 250 extends and is close to the top of the screw column 2010 of the metal die casting 20, and the other end of each exhaust groove 250 extends to the upper end surface of the profiling collar 200. It can be understood that by making the profiling collar 200 sleeved on the top of the screw column 2010 of the metal die casting 20, when the rotating welding head 110 of the friction welding machine 100 presses against the top of the screw column 2010 of the metal die casting 20, the top of the screw column 2010 of the metal die casting 20 is constrained by the profiling collar 200, and the flash formed in the circumferential direction will be reduced. At the same time, by making one end of each exhaust groove 250 extend and be close to the metal die casting, The top of the screw column 2010 of the metal die casting 20 is compacted by the rotating welding head 110 of the friction welding machine 100, and the other end of each exhaust groove 250 extends to the upper end surface of the profiling ring 200. When the rotating welding head 110 of the friction welding machine 100 compacts the top of the screw column 2010 of the metal die casting 20, the gas in the sand hole at the top of the screw column 2010 of the metal die casting 20 can be discharged from the upper end surface of the profiling ring 200 through the exhaust groove 250, thereby facilitating exhaust while reducing flash.

[0086] Combination Figure 4 and Figure 6 As shown, conventionally, after the top of the screw column 2010 of the metal die-casting 20 is frictionally pressed by the rotating welding head 110 of the friction welding machine 100, a flash will be generated on the surrounding side of the top of the screw column 2010 of the metal die-casting 20, which will hinder the removal of the contoured ring 200.

[0087] In order to facilitate the removal of the contoured ring 200, in one embodiment, the contoured ring 200 includes an outer ring 220 and an inner ring 230, wherein the outer ring 220 is sleeved on and detachably connected to the outside of the inner ring 230, and the inner ring 230 is divided into a first half ring 2310 and a second half ring 2320 that are relatively arranged, and the first half ring 2310 and the second half ring 2320 form an inner ring cavity for being sleeved on the top peripheral wall of the screw column 2010 of the metal die casting 20. It can be understood that when the contoured collar 200 is sleeved on the top of the screw column 2010 of the metal die casting 20, the first half ring 2310 and the second half ring 2320 can be sleeved together on the top peripheral wall of the screw column 2010 of the metal die casting 20. After the rotating welding head 110 of the friction welding machine 100 compacts the top of the screw column 2010 of the metal die casting 20, since the outer collar 220 is detachably connected to the outside of the inner collar 230, the user can first remove the outer collar 220 and the inner collar 230, and then separate the first half ring 2310 and the second half ring 2320 from both sides of the top of the screw column 2010 of the metal die casting 20, so that the contoured collar 200 can be smoothly removed. In this embodiment, the first half ring 2310 and the second half ring 2320 are connected to the outer collar 220 by screws 240, respectively.

[0088] Combination Figure 2 As shown, in one embodiment, a friction head 1110 is convexly provided at the end of the rotating welding head 110, and the friction head 1110 is used to abut against the top of the screw column 2010 of the metal die casting 20. It can be understood that by providing the friction head 1110 at the end of the rotating welding head 110, the friction head 1110 abuts against the top of the screw column 2010 of the metal die casting 20, so that the friction head 1110 can be more easily pressed to compact the top of the screw column 2010 of the metal die casting 20.

[0089] Combination Figure 2 As shown, in one embodiment, the diameter of the friction head 1110 is smaller than the diameter of the top of the screw column 2010 of the metal die casting 20. It can be understood that, since the diameter of the friction head 1110 is smaller than the diameter of the top of the screw column 2010 of the metal die casting 20, when the friction head 1110 abuts against and rubs the top of the screw column 2010 of the metal die casting 20, the friction head 1110 can melt the top of the screw column 2010 of the metal die casting 20, and at the same time, squeeze the molten metal material at the top of the screw column 2010 of the metal die casting 20 in the circumferential direction, so that the top of the screw column 2010 of the metal die casting 20 forms a pre-opening with a dense structure, and the pre-opening can be used for subsequent alignment and opening of a thread groove.

[0090] Combination Figure 3 As shown, usually, since the friction heat is mainly concentrated on the top of the screw column 2010 of the metal die-casting 20, that is, the hot melt softening degree of the top of the screw column 2010 of the metal die-casting 20 is the highest and gradually decreases along the vertical direction, as the friction head 1110 gradually squeezes and penetrates into the top of the screw column 2010 of the metal die-casting 20, the resistance encountered by the friction head 1110 will increase, thereby hindering the penetration process of the friction head 1110, resulting in a slow process of the pre-hole forming, and ultimately leading to a decrease in production efficiency.

[0091] Combination Figure 3 As shown, in one embodiment, the friction head 1110 includes a piercing head 1111 and a spreading portion 1112, and the piercing head 1111 is connected to the top of the screw column 2010 of the metal die-casting 20 through the spreading portion 1112. The piercing head 1111 is V-shaped, and the cross-sectional area of ​​the spreading portion 1112 gradually increases from one end close to the piercing head 1111 to one end close to the top of the screw column 2010 of the metal die-casting 20. It can be understood that by setting the thorn head portion 1111 into a V-shape, the friction force on the V-shaped thorn head portion 1111 is smaller, so that the thorn head portion 1111 can more easily penetrate into the top of the screw column 2010 of the metal die-casting 20 to form a groove. Since the cross-sectional area of ​​the support portion 1112 gradually increases from one end close to the thorn head portion 1111 to one end close to the top of the screw column 2010 of the metal die-casting 20, the groove can be gradually expanded by the support portion 1112, thereby accelerating the forming of the pre-opening.

[0092] Combination Figure 2 As shown, in one embodiment, the profiling collar 200 extends a handle 210 to the circumferential side. It can be understood that, since the profiling collar 200 extends a handle 210 to the circumferential side, when the rotating welding head 110 of the friction welding machine 100 rotates relative to the profiling collar 200, the user can control the position of the profiling collar 200 through the handle 210 to prevent the profiling collar 200 from loosening when the rotating welding head 110 rotates. At the same time, when the rotating welding head 110 is completed, the user can pull the profiling collar 200 upward from the top of the screw column 2010 of the metal die casting 20 through the handle 210, thereby realizing the rapid disassembly of the profiling collar 200.

[0093] Combination Figure 3As shown, in one embodiment, the diameter of the inner ring of the profiling collar 200 gradually decreases from one end close to the top of the screw column 2010 of the metal die casting 20 toward the friction welding machine 100. It can be understood that since the diameter of the inner ring of the profiling collar 200 gradually decreases from one end close to the top of the screw column 2010 of the metal die casting 20 toward the friction welding machine 100, it can adapt to the structure of the screw column 2010 of the metal die casting 20. When the profiling collar 200 is displaced downward and sleeved on the screw column 2010 of the metal die casting 20, since the inner ring of the profiling collar 200 gradually decreases upward, the peripheral wall of the screw column 2010 of the metal die casting 20 will be able to abut against the inner ring wall of the profiling collar 200 during the upward extension of the screw column 2010 of the metal die casting 20, so that it is securely sleeved and stationary on the top of the screw column 2010 of the metal die casting 20.

[0094] Combination Figure 2 As shown, in this embodiment, an angle a of 1° to 2° is formed between the extension line of the inner ring wall of the profiling collar 200 and the central axis of the inner ring of the profiling collar 200. It can be understood that by forming an angle a of 1° to 2° between the extension line of the inner ring wall of the profiling collar 200 and the central axis of the inner ring of the profiling collar 200, the diameter of the inner ring of the profiling collar 200 is more gradually reduced from the end close to the top of the screw column 2010 of the metal die casting 20 to the friction welding machine 100, so that the profiling collar 200 can be smoothly sleeved downward on the screw column 2010 of the metal die casting 20. Specifically, the size of the angle a can be 1°, 1.5° or 2°, etc., of course, it is not limited here, and those skilled in the art can replace it according to needs.

[0095] Combination Figure 5 and Figure 7 As shown, in one embodiment, the diameter of the rotating welding head 110 is smaller than the diameter of the inner ring of the profiling collar 200. It can be understood that since the diameter of the rotating welding head 110 is smaller than the diameter of the inner ring of the profiling collar 200, the rotating welding head 110 can smoothly pass through the inner ring of the profiling collar 200, and can effectively avoid interference between the rotating welding head 110 and the inner ring wall of the profiling collar 200, which can not only ensure that the rotating welding head 110 can directly abut against the top of the screw column 2010 of the metal die casting 20, but also enable the rotating welding head 110 to smoothly rotate and rub the top of the screw column 2010 of the metal die casting 20 in the inner ring of the profiling collar 200.

[0096] In one embodiment, the diameter of the inner ring of the profiling collar 200 is 0.5mm to 1mm larger than the diameter of the rotating welding head 110. It can be understood that when the rotating welding head 110 of the friction welding machine 100 extends into the inner ring of the profiling collar 200, since the diameter of the inner ring of the profiling collar 200 is 0.5mm to 1mm larger than the diameter of the rotating welding head 110, a gap of 0.5mm to 1mm can be maintained between the peripheral wall of the rotating welding head 110 and the inner ring wall of the profiling collar 200, so that the rotating welding head 110 can avoid rubbing against the inner ring wall of the profiling collar 200 during the rotation process and causing interference. Specifically, the diameter of the inner ring of the profiling collar 200 can be 0.5mm, 0.7mm or 1mm larger than the diameter of the rotating welding head 110, etc., of course, it is not limited here, and those skilled in the art can replace it according to needs.

[0097] In one embodiment, in step S300, the rotating welding head 110 of the friction welding machine 100 rotates relative to the contoured collar 200 to frictionally compact the top of the screw column 2010 of the metal die casting 20, specifically:

[0098] S310, driving the rotating welding head 110 to rotate clockwise an odd number of circles.

[0099] In this embodiment, by driving the rotating welding head 110 to rotate clockwise an odd number of circles, the rotating welding head 110 can rotate clockwise to rub the top of the screw column 2010 of the metal die casting 20, so that the top of the screw column 2010 of the metal die casting 20 is hot-melted.

[0100] S320, driving the rotating welding head 110 to rotate counterclockwise an even number of circles.

[0101] In this embodiment, by driving the rotating welding head 110 to rotate counterclockwise an even number of circles, the rotating welding head 110 can rotate counterclockwise to rub the top of the screw column 2010 of the metal die casting 20, so that the top of the screw column 2010 of the metal die casting 20 is hot-melted.

[0102] S330 , driving the rotating welding head 110 to move vertically toward the top of the screw column 2010 of the metal die casting 20 .

[0103] In this embodiment, by driving the rotating welding head 110 to move vertically toward the top of the screw column 2010 of the metal die-casting 20, the rotating welding head 110 is pressed downward to form a dense structure on the top of the screw column 2010 of the metal die-casting 20, so that the threaded hole opened on the top of the screw column 2010 has high structural strength and the threaded hole is more durable.

[0104] It can be understood that by first rotating the rotating welding head 110 clockwise for an odd number of circles and then rotating the rotating welding head 110 counterclockwise for an even number of circles, the rotating welding head 110 is made to reciprocate and rub the top of the screw column 2010 of the metal die-casting 20, so that the top of the screw column 2010 of the metal die-casting 20 can be rubbed and melted more evenly, so that when the rotating welding head 110 is driven to move vertically toward the top of the screw column 2010 of the metal die-casting 20, the top of the screw column 2010 of the metal die-casting 20 can be pressed more tightly.

[0105] The present disclosure also provides a metal die-casting 20, on which a screw column 2010 is protruding, and the screw column 2010 is processed and formed by the metal die-casting sand hole pretreatment method based on the screw column friction forming device of any of the above-mentioned embodiments. It can be understood that by applying the metal die-casting sand hole pretreatment method based on the screw column friction forming device of the present disclosure to the screw column 2010 of the metal die-casting 20, the rotating welding head 110 of the friction welding machine 100 can be made to abut against the top of the screw column 2010 of the metal die-casting 20, and when the rotating welding head 110 of the friction welding machine 100 rotates relative to the contoured collar 200, the rotating welding head 110 of the friction welding machine 100 and the screw column 2010 of the metal die-casting 20 The friction between the tops of the friction welding machine 100 can generate a large amount of heat, which melts the top of the screw column 2010 of the metal die-casting 20, and the top of the screw column 2010 of the metal die-casting 20 is pressed by the rotating welding head 110 of the friction welding machine 100 to form a dense structure, so that the threaded hole opened on the top of the screw column 2010 has high structural strength and is more durable, and finally the above-mentioned metal die-casting 20 can be tightly and stably connected with other structures through the screw column 2010.

[0106] Compared with the prior art, the present invention has at least the following advantages:

[0107] 1) The profiling collar 200 is sleeved on the top of the screw column 2010 of the metal die casting 20, that is, the top of the screw column 2010 of the metal die casting 20 is extended into the inner ring of the profiling collar 200, and the rotating welding head 110 of the friction welding machine 100 is driven to extend into the inner ring of the profiling collar 200, so that the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 can contact each other under the guidance of the inner ring wall of the profiling collar 200. When the rotating welding head 110 of the friction welding machine 100 abuts against the metal die casting 20 When the top of the screw column 2010 of the metal die casting 20 is welded, the rotating welding head 110 of the friction welding machine 100 is rotated relative to the contoured collar 200, so that the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 generates heat, and the heat melts the top of the screw column 2010 of the metal die casting 20, and the top of the screw column 2010 of the metal die casting 20 is formed into a dense structure through the pressure of the rotating welding head 110 of the friction welding machine 100, so that the threaded hole opened on the top of the screw column 20 has high structural strength and is more durable.

[0108] 2) Compared with the prior art, the threaded hole sand hole mold insert core pulling structure is improved, and the metal die casting sand hole pretreatment method based on the screw column friction forming device is used to treat the top of the screw column 2010 of the metal die casting 20, so that the friction between the rotating welding head 110 of the friction welding machine 100 and the top of the screw column 2010 of the metal die casting 20 generates heat, so that the top of the screw column 2010 of the metal die casting 20 is melted to form a dense structure, which can effectively eliminate the sand holes on the top of the screw column 2010 of the metal die casting 20. At the same time, there is no situation where the insert core is broken or blocked, thereby avoiding the time waste caused by replacing the insert core, and can effectively improve production efficiency.

[0109] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A method for pretreating sand holes of metal die castings based on a screw column friction forming device, characterized in that: The method is performed by using a screw column friction forming device, and the screw column friction forming device comprises: Friction welding machine; A contoured collar, which is used to be sleeved on the top of a screw column of a metal die casting; The rotating welding head of the friction welding machine extends into the inner ring of the contoured collar, and the rotating welding head of the friction welding machine is used to abut against the top of the screw column of the metal die casting; The metal die casting sand hole pretreatment method based on the screw column friction forming device includes the following: The contoured collar is sleeved on the top of the screw column of the metal die casting; Driving the rotating welding head of the friction welding machine to extend into the inner ring of the contoured sleeve; When the rotating welding head of the friction welding machine abuts against the top of the screw column of the metal die casting, the rotating welding head of the friction welding machine is driven to rotate relative to the contoured collar to frictionally compact the top of the screw column of the metal die casting.

2. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The method of sleeve-arranging the contoured collar on the top of the screw column of the metal die casting is specifically as follows: 3 / 4 of the inner ring of the profiling ring is sleeved on the top of the screw column of the metal die casting, and 1 / 4 of the inner ring of the profiling ring is protruded and surrounds the top of the screw column.

3. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The driving of the rotating welding head of the friction welding machine to rotate relative to the contoured collar is specifically: The rotating welding head of the friction welding machine is driven to rotate clockwise relative to the contoured sleeve ring.

4. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 3 is characterized in that: The number of clockwise rotations of the rotating welding head of the friction welding machine relative to the contoured sleeve ring is an odd number of rotations.

5. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The driving of the rotating welding head of the friction welding machine to rotate relative to the contoured collar is specifically: The rotating welding head of the friction welding machine is driven to rotate counterclockwise relative to the contoured sleeve ring.

6. The method for pre-treating sand holes of metal die castings based on the screw column friction forming device according to claim 5 is characterized in that: The number of turns that the rotating welding head of the friction welding machine rotates counterclockwise relative to the contoured sleeve ring is an even number.

7. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The method of driving the rotating welding head of the friction welding machine to rotate relative to the contoured collar comprises: The rotating welding head is driven to move vertically toward the top of the screw column of the metal die casting.

8. The method for pre-treating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The method further comprises the following steps before the contoured collar is sleeved on the top of the screw column of the metal die casting: The metal die casting is fixed on a machine table.

9. The method for pretreating sand holes of metal die castings based on a screw column friction forming device according to claim 1, characterized in that: The diameter of the inner ring of the contoured collar gradually decreases from one end close to the top of the screw column of the metal die casting toward the friction welding machine.

10. A metal die casting, characterized in that: The metal die casting is provided with a screw column protruding thereon, and the screw column is processed and formed by the metal die casting sand hole pretreatment method based on the screw column friction forming device according to any one of claims 1 to 9.

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