TWI314074B - - Google Patents

Description

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1314074 IX. Description of the invention: [Technical field to which the invention belongs] Proof that "the manufacturing of the screw is made of a dissimilar metal to make a tolerance". The method of 9-drilling screw The prior art] 10000 φ round U and a drill bit 12, due to The _ part 12=, 1 has a main part of the screw body that is responsible for cutting when drilling the object, the Guanghai stainless steel self-drilling screw is 1 ... high, so generally the steel is not produced: drill = comparison = : U and the drill bit The part 12 will be made of different materials, for example, using the type Γ to make the screw portion u of the self-drilling screw, and the bit portion is made of nine right-hand carbon steel. f knowing that the steel self-drilling snail is not recorded on the smashing machine. The squeezing part of the non-recorded steel part U and the medium carbon steel bit part 12 are connected by electric resistance butt welding, and the semi-finished products after the connection are After the cutting, straightening and tapping steps, the thread is threaded, and then a hardening process is used to achieve the hardness required for drilling. As shown in Fig. 2 and Fig. 3, the high temperature generated by the resistance butt welding causes the material of the screw portion U and the drill portion 12 to melt, and is formed between the two into a joint 13' and 4 near the junction 13 The 4 area (shown by the dashed line in the figure) can also be called -:: heat affected zone 200". The melting of the material when the resistance is butt welded will produce the warming material 1GG 'and (4) the output _ will be in the resistance pair After the welding process, with the rapid cooling, a hard protruding area is formed on the surface of the joint between the screw body u and the drill 12, and the heat-affected zone 2 itself is hardened, which is disadvantageous for subsequent Cutting the spillage and tapping process. 5 1314074 / To solve this problem, it is reasonable to first temper the post-weld semi-finished product, and let the spill discuss the soft-affected zone after softening. The material (10) package|! is divided by the convenient tapping step, but the tempering treatment has its difficulty, because the tempering will cause the corrosion resistance of the screw portion n to be unrecorded, which will increase the overall process. Complexity and cost, so it is generally not used in the #界, but directly to the Hungarian In addition to the procedure, and the semi-finished stainless steel self-drilling screw 仍 semi-finished product still with the hard heat affected zone, the attack step is performed. However, if the heat-affected zone is directly over-hardened, the semi-finished 'j β 仃 tapping' It will speed up the wear rate of the tapping die and increase its replacement rate and reduce the quality of the manufactured product. In addition, due to the working surface of the semi-finished semi-finished product of the non-recorded steel before the tapping, there is a protruding area. Instead of a flat surface, plus the protruding area ' ” is harder than other areas of the surface, when the non-drilling steel self-drilling semi-finished product is tapped, it will cause the tapping mold. The wear is not + both' and the wear of the tapping die is difficult to get rid of. It is difficult to get it immediately when it is worn. (4) It is replaced and replaced immediately, resulting in the case that the tapping die has worn out but has not been replaced immediately. Defective product of the deformation shown in Fig. 3. In addition, in order to match the medium carbon steel material f of the drill portion 12, in the tempering after the brazing and the hardening treatment of the drill portion, the carbon in the medium carbon steel is deposited on the joint 13 in combination with the chromium which does not record the steel. At the grain boundary, the grain boundary is embrittled, and the screw body U is also precipitated in the grain boundary by its own chromium carbide, which is commonly known as sensitization ("A-),,,* when the material is sensitive. After the chemical resistance, the anti-aliasing will be reduced. Therefore, the conventional stainless steel self-drilling screws! There are many empty spaces that can be improved in terms of material selection and manufacturing methods.

1314074 [Summary of the Invention] In the fourth aspect of the present invention, it is provided that the hardened structure formed by the resistance butt welding at the joint of the two materials can be avoided to effectively improve the uneven wear phenomenon of the mold and improve the self-drilling of the residual steel. The resistance of the screw (four). And 疋, the joint dissimilar metal of the present invention is made of a corrosion-resistant self-drilling screw 3 screw, a body preparation step, a drill portion preparation step, a welding joint step, a spill cutting step, a tapping step, and Time strengthening step. - Fox The preparation step of the screw body is to make a screw body which is selected from the group consisting of: Vostian (4) non-recorded steel, duplex stainless steel and gilt alloy. In the step of preparing the drill portion, a low carbon precipitation strengthening alloy steel material having a carbon content of less than or equal to a carbon content is used as a material to prepare a drill portion, and the spare 4 welding connection step is to connect the screw portion and the 3D drill portion to each other by a resistance butt welding method. Fixing, the overflow cutting step is to cut and break the overflow generated by the resistance butt welding, and the tapping step is to tap the _ part of the body after the mutual connection, and the pure temperature is strong: The step is the semi-finished product after the W tapping, and the processing below the Celsius fineness is performed to harden the drill portion. The effect of the present invention is to manufacture the screw portion and the drill portion by using a non-recording steel and a low-carbon precipitation strengthening alloy steel, respectively, so that the joints thereof do not harden when connected by resistance butt welding. It is beneficial to the implementation of the subsequent tapping step and reduces the damage of the tapping die (4), and the low temperature aging strengthening step below the temperature can reduce the sensitization of the steel material of the screw body 7 1314074 (meaning the finished product) The above-mentioned and other technical contents, features and effects of the present invention are described in the following with reference to a preferred embodiment of the preferred embodiment of the present invention. In, it will be clearly presented.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals. As shown in FIG. 4, a preferred embodiment of the method for bonding a dissimilar metal to a corrosion resistant self-drilling screw according to the present invention comprises a screw portion preparation step 41, a drill portion preparation step 42, a solder joint step 43, and a spatter cutting. The step material, a tapping step 45, and a low temperature aging strengthening step 46. First, the screw body preparation step 41 is performed. In the embodiment, the screw body preparation step 41 is to make a screw body portion of the 304L type stainless steel and use it as a spare material. However, the material may also be other (four) Worth w. The iron system does not record copper, two-phase non-recording steel or recording base alloy, so it should not be limited to this embodiment. Next, the drill portion preparation step 42 is performed. The drill portion preparation step is made of a low carbon precipitation strengthened alloy steel material as a material, and the above-mentioned low rhyme (four) compound surface material is cut 4 (weight percentage 0.1). Below %, the low (four) out of the strengthened alloy steel can be a knife, _·_, 15·, π-special 'in the present example is the use of 17_4 ΡΗ type and another 'worth worth mentioning, due to the preparation in the screw body =. and 8 1314074 The preparation machine, mold and other related equipment used in the preparation of the drill portion 42 are all existing products, and the operation principle and operation details of the drill portion should be known to those skilled in the art. The worker is not added here: the description is followed. The welding joining step 43 is performed, and the screwing step 杓 is that the screw portion and the drill portion which are produced in the step (5) are mutually coupled by resistance butt welding. Fixed, although the high heat during the resistance butt welding process causes the screw body and the drill portion to form a heat-affected zone at the joint thereof as it is conventionally connected, since the drill bit is a low carbon precipitation strengthening alloy steel Made of, including The amount of rabbits is generally lower than 〇.〇8%, and the precipitated reinforced alloy steel does not form a heat-affected zone in the heat-affected zone of the cerium in this carbon content. 'The overflow during welding=::=Important hard TM No need to temper the overall process simplification: work (split cutting and tapping), which is beneficial to the resistance butt welding method is commonly used in the industry - welding means, basin 2 application and operation details are familiar with this technology ..., so it is not mentioned here that it should be followed by the overflow cutting step 44. The material will be produced by the resistance of the material after the cutting process. The subsequent cold working process is a flat == cutting by the cutting In order to provide the loss. In this step, the + force surface is used to reduce the product of the mold, so the equipment for cutting the spill in this section is also a matter of frightening, and will not be described here. In the tapping step 45, the screw portion and the drill portion are tapped; the 疋 pairs are connected to each other, and after the tapping, a thread is formed on the screw body 1314074 and the a drill portion. After the resistance butt welding in the solder bonding step The semi-finished product will have (4) the heat-affected zone, and the spillage caused by the resistance to butt welding has already occurred in the material of the spill cutting step, so the wear rate of the tapping die for tapping is not It will be as serious as conventionally. Furthermore, the semi-finished product has a flattened n after passing through the spill cutting step 44. Therefore, the tapping die does not have an uneven grinding phenomenon as is conventionally known, which is advantageous for extending. The service life of the tapping die saves operating costs.

a then performing a low temperature aging strengthening step 46, which performs a heat treatment below the Celsius degree on the semi-finished product after the tapping and causes the hardening to occur. In this embodiment, the semi-finished product after the tapping is passed. , I Ί T of 450 degrees Celsius low temperature aging treatment, so that it hardens and reaches the hardness of drilling and pounding. Since the Worthfield iron-based stainless steel is heated in a temperature range of $(8) to 8〇〇C, it tends to cause precipitation of carbides and reduces its inhibition. Therefore, the process uses a temperature below Celsius for low-temperature aging strengthening.

As shown in the figure θ, because this process is not as hard as the conventional hardening process, the high temperature above Celsius is used, so the sensitization process of the material is smaller than the conventional one, which means that compared with the conventional one. In the case of the present invention, the self-drilling shovel and the finished product 400 produced by the method of manufacturing the corrosion-resistant self-drilling screw of the dissimilar metal in the interface have better cost, and the durability of the self-drilling screw is improved. Increase its market competitiveness. In addition, the other advantage of the present invention is that if it is used, the type of material is not used, and the material of the body part is used together with the 17_4 pH type precipitation strengthened stainless steel 10 1314074 for the material of the drill part (3〇4L type matching) PH13-8MO type can also be used, because the resistance characteristics of the two materials and the material's thermal resistance effect are close to the conventional 304L·matching carbon steel, so the resistance to the welding method in the welding connection step 43 is greatly increased. . On the other hand, since the material of the drill portion used is also stainless steel instead of the conventional carbon steel, the overall corrosion resistance of the self-drilling screw product 400 is substantially increased invisibly.

In summary, the method and product for producing a self-drilling screw resistant to a different type of metal in the present invention are manufactured by using a low carbon precipitation strengthening alloy steel having a carbon content of less than %ι%, and by using its unique The physical properties are such that the hot material zone is not hardened by the high temperature resistance butt welding, and the second embodiment of the overflow cutting step 44 and the cold tapping of the tapping step 9 The dissimilar metal is made to resist the surname self-drilling snail, and the '糸= method further reduces the degree of material sensitization by its low temperature aging strengthening step below 500 degrees Celsius, and enters σ 曰+ + Screws into 〇Π, have better resistance to narrative, effectively improve the conventional material sensitization

Cheng: The problem of good quality, it can indeed achieve the purpose of the present invention. The description is only for the preferred embodiment of the present invention, and the scope of the present invention is limited to the scope of the present invention, and the simple patents of the patent application and the description of the invention are based on the present invention. Within the scope of the invention patent. She and the decoration are still [Simplified illustration] Figure 1 is a schematic diagram showing the parts made of different materials of different kinds; the stainless steel self-drilling screw

Figure 2 is a front view showing a semi-finished product of a conventional stainless steel self-drilling screw after a joining process of 11 1314074; Figure 3 is a different view 'describes a defective product of a conventional stainless steel self-drilling screw after a tapping process; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the method of making a corrosion resistant self-drilling screw for joining dissimilar metals according to the present invention; and FIG. 5A, illustrates a finished self-drilling screw made using the preferred embodiment. 12 1314074 [Description of main component symbols] 41 ····_ ...·Spiral part preparation step 45... ...Tapping step 42......Drill part preparation step 46... ...low temperature aging strengthening step 43•.... ...··welding connection step 4〇〇...·•• Self-drilling screw into σα 44..." •... spill cutting step

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Claims (1)

1314074, the scope of application for patents 1. Connect δ dissimilar metal to make self-drilling (Άλ, „, ..., 糸 method, including: U) preparation part of the screw body, ^ lower body and spare, the screw body 4 The material is selected from the group consisting of the following points: Worthfield iron-based stainless steel, duplex stainless steel and nickel-based alloy; (b) the preparation steps of the drill bit, including, A, 3 tired in the 〇. 1% or less of low-carbon precipitation strengthening port to steel is made of material (4) Welding, Chashe "胄 部 部 备用 备用 备用 ; ; ; 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 用 电阻 电阻 电阻 电阻 电阻 电阻The overflow cutting step will be...^ The spillage generated after the resistance butt welding is removed by cutting. (e) Tapping step, cutting and tapping the mutual surname; and the screw body and the bit portion (f) low temperature aging strengthening step, 5〇〇^ ιν ^ for the semi-finished product after tapping, 2 (four) is processed The drill bit is hardened. 2. According to the method of claim i of the self-drilling screw, wherein the joint resistant dissimilar metal is made of corrosion-resistant alloy steel, which is selected from the group consisting of low carbon precipitation PH13 8MO 所述 described in step (b). :17-4PH, , i5_5PH 3. - Borrower 3" 7·7ΡΗ, PH15-7MO. Kind of & heterogeneous metal resistance and the screw body are welded to each other with the wrong screw 'has - screw body and - part The upper part has a thread, and the drill portion 'the screw body and the drill bit group: the material of the Wostian weave τ, °卩 is selected from the following, stainless steel, duplex stainless steel, and nickel base The drill portion is made of a low carbon precipitation strengthening alloy steel 14 1314074 having a carbon content of less than .1%. - 4. A joint dissimilar metal according to claim 3 of the patent application. The corrosion resistant self-drilling screw, wherein the low carbon precipitation strengthening alloy steel is selected from the group consisting of 17-4PH, PH13-8MO, 15-5PH, 17-7PH, PH15-7MO. 15