TW519499B - Method of forming insert nut - Google Patents

Abstract

This invention is related to a method of forming an insert nut, comprising the steps of: cutting an elongate material into billets of appropriate lengths; forming an indent zone and a flatten, expanded ear portion at a radial center of each of the billets; pressing the billet along the indent zone in an axial direction by means of a first press in a first forming mold subjecting the billet to fill in a forming mold comprising a hollow tube and having a plurality of forming channels, along the radial direction, to form a plurality of grooves beneath the ear portion of the billet extending radially outwards along the billet and forming a first stepped hole, a second stepped hole and a tapped hole in an inner diameter of the billet; forming a feeding hole in the billet at another end opposite to the ear portion of the billet by means of a second press pressing towards the radial center; positioning the billet in a second forming mold; pressing the billet along a radial direction to rapture the plurality of grooves; and puncturing through the billet along the axial direction of the billet by means of the first press to form an insert nut.

Description

519499 V. Description of the invention (1) [Field of the invention] The present invention relates to a method for forming a pull cap, which mainly puts a material into a mold with a molding groove, and forms a tool by axial extrusion and crushing. The grooved pull cap greatly improves the material utilization rate and manufacturing speed, and reduces the equipment cost required for production. [Background of the invention] According to the invention, the pull cap is an indispensable element for combining two pieces. Please refer to FIG. 1 and FIG. 2 for a schematic view of the appearance and assembly of a slotted pull cap (Slutted insert nut). The grooved pull cap is basically a kind of pull cap. The assembly tool can be used to assemble the pull cap on the plate. The thickness range of this grooved pull cap is larger than that of the general pull cap. The thickness of the combined board is only about 2 to 4 legs, and this grooved pull cap has a thickness range of about 6 mm, and this kind of pull cap can be wider than other general pull caps. The bending length (bubble) can be applied to the softer plate. In such a grooved pull cap which can be applied to the assembly of relatively soft plates, the conventional manufacturing method is shown in FIG. 3, and the material body 40 'is cut to an appropriate length along the end of the material body 40'. A thread forming hole 4 2 ′ is formed in the axial direction, and an enlarged ear portion 44 ′ is formed at the other end of the material body 40 0 ′; and the body is formed between the ear portion 4 4 ′ of the material body and the thread forming hole 4 2 ′. , Four grooves 4 6 ′ are formed by cutting, and then one end of the material body 4 0 ′ ear 4 4 ′ is drilled in the axial direction to drill through the four grooves 4 6 ′ and generate two levels of holes 4. 8 ', such as section A-A. Because the four grooves in this grooved pull cap are the main key factors affecting the performance of the pull cap, it must be used multiple times when it is produced by the conventional method.

Page 4 519499 V. Description of the invention (2) Processing can only form grooves and thread forming holes, and when the grooves are broken, most of the material of the material needs to be drilled out, which makes the material utilization rate extremely low; another On the other hand, the use of drilling methods has greatly reduced the production rate, because a drilling machine can only set about 10 pull caps per minute, and the drill's loss of the drill is also a major problem. · Therefore, how to develop a simple, fast, and high material utilization method to overcome the shortcomings of the conventional pull cap production method is a problem to be solved by the current production industry. [Objective and Summary of the Invention] The main object of the present invention is to provide a method for forming a pull cap. The material g is placed in a forming mold with a plurality of forming grooves, and the material is filled into the forming mold by extrusion. A plurality of grooves are formed in an axial extrusion manner to accelerate the production rate of the pull cap and improve the material use efficiency. A secondary object of the present invention is to provide a method for forming a pull cap, which is at the final completion stage of the pull cap, and uses a method of crushing the groove to generate a stress point for the material, which is used to assemble the pull cap from the stress when the board is assembled Make the largest bending deformation to fix the plate. The invention provides a method for forming a pull cap, which is based on axially extruding a material body to fill the material body with a mold having a molding groove, and then forming a pull cap with a groove in an axial crushing manner, thereby greatly improving the use of materials. Rate and manufacturing speed, and reduce the equipment cost required for production. At this point, the purpose of the present invention has been described. The following describes the present invention with specific examples, and those who are familiar with this method will be able to refer to the description of this example to obtain sufficient knowledge to implement it; however, the following is more specific. True

Page 5 519499 V. Description of the invention (3) The examples illustrate the method features of the present invention, but the patent scope of the present invention is not limited by the following examples. [Simplified description of drawing number] 10 Material 1 0 2 Depression area 1 04 Ear 106 First-stage hole 108 110 112 114 116 118 120 20 22 30 32 32 34 40 '42' 44 '46' 48, groove Cross section of the second stage hole Thread forming hole Bottom hole Waste material expansion part One forming die forming groove Two forming die inflating die mouth # Carcass thread forming hole Ear groove groove step hole

Page 6 519499 V. Description of the invention (4) [Detailed description] Please refer to Figure 4, which is the manufacturing sequence diagram of the method for forming the pull cap of the present invention. It is squeezed in the axial direction to make the material full. The grooved mold is then formed in the form of an axially crushed pull cap with a concave groove. The detailed forming steps are as follows: First, the entire rolled strip material is cut into a material body 10 with an appropriate length for processing. The material body 10 of appropriate length is straightened, the two ends of the material body 10 are flattened, and a recessed area 102 is formed at the radial center of the material 10-end, and then a recessed area is formed on the material body 10 One end of 10 2 is pressed to form a flat enlarged ear portion 1 0 4 0, and then the material body 10 is inserted into the first forming mold 20 with respect to the ear 1 104-end, where the first forming The mold 20 is a hollow cylinder with a cylindrical shape, and four forming grooves 22 are provided in the radial direction of the inner diameter of the cylinder. The forming grooves 22 are uniform and symmetrical in pairs. The first extrusion is used. Such as a punch, squeeze a distance in the recessed area 10 of the material body 10 in the axial direction, so that the material body 10 fills the molding die 20 in the radial direction; A first-stage hole 106 is formed axially in the inner diameter of the material body 10, and four grooves 108 are formed below the material body 10 ears 104 and along the periphery of the material body 10 axis. The grooves 108 are at 90 degrees opposite each other, such as the cross section B-B 〇 # The first extruded object further advances in the axial direction for a distance and squeezes the material body 10, and the material body 10 inner diameter axis To form a second class hole 1 1 0. The inner diameter of the second-stage hole 110 is smaller than the inner diameter of the first-stage hole 106, so as to form a section 112 between the two-stage holes, such as section B-B. The first extruded object is further along the 10-end 10-4 end of the material body, and along the

Page 7 519499 V. Description of the invention (5) The material body 10 is advanced axially for a distance, and a thread forming hole 1 1 4 is extruded; a second extruded material is used for the material body 10 ears 1 〇4 The other end is extruded along the axial center to form a lower hole 1 1 6 in the material body 10. The material body 10 is inserted into a second forming mold 30 with respect to the ear portion 104. The length of the second material forming mold 30 is shorter than that of the material body 10, and its inner diameter has an enlarged portion 3 2. Tap the recessed area 1 0 2 of the material body 10 and the ear portion 10 4 along the material body 10 axis, so that the material body 10 is composed of the first-class holes 106 and the second-class holes. The section 1 1 2 between 1 and 10 expands in the radial direction to form an expansion section 1 2 0, which shortens the length of the material 10 and causes the four grooves 108 on the periphery of the material 10 to rupture. An extruded material is further extruded along the material body 10 axis to remove the waste material 1 1 8 located between the thread forming hole 1 1 4 and the lower material hole 1 16 to penetrate the material body 10 so as to pass through the material body 10 10 axially formed three sections of first-stage holes 106 of different lengths and different inner diameter distances, second-stage holes 1 1 0 and thread forming holes 1 1 4. The material body 10 is taken out in the axial direction, because the internal diameter of the expansion part 12 of the material body 10 is larger than the internal diameter of the die opening 34 of the second molding die 30, so when the material body 10 is taken out At this time, the expansion portion 120 can be reduced to form a pull cap with a broken groove 108. Because in the above steps, the groove 108 of the pull cap has been broken, and the material has been bent and stretched in advance at the section 1 1 2 between the first-stage hole 106 and the second-stage hole 1 10; and Then, the die opening 3 4 of the second molding die 30 is used to reduce the expansion portion 12 of the material body 10 to the original inner diameter. When the pull cap is used later, the pull cap is deformed to fix it. When sheet material is used, the pull cap will be deformed along the cross section 1 12. This design will make each curved part of the pull cap deform at the same position and form the same degree of bending.

Page 8 519499 V. Description of the invention (6) Therefore, for the drilling method that needs to be punched in accordance with the present invention, the pull cap not only improves the manufacturing process, it also saves more, without damaging the cost of the groove and the material. However, it should not be used for the purpose of description, but should be used to wash out any cracks. The fixed effect of the part that has been served beforehand should be increased. The shape defined above is included in the fixing of the sheet to have an average force effect. The method of forming the pull cap is not only more processing in processing, but the production efficiency is far greater than the reliability of the conventional process that only eliminates the problem of drilling machine and drill loss, because there is an additional process risk in the conventional technology; In addition, in the material, the rod is squeezed to fill the material in the mold, and the secondary processing method is used. About 50% of the material must be discarded and cannot be used again: plus; and another advantage of the present invention is Due to the expansion of the pull, the pull cap bit is deformed during subsequent operation to use it when fixing the plate. The author is only one of the preferred embodiments of the present invention, and the scope of the invention is implemented. For example, any equivalent change in terms of the application, structure, characteristics, and spirit of the present invention shall fall within the scope of the patent application of the present invention. Fast, only secondary processing and cost, the use of channel drilling is more, and drilling at all makes the material of the cap will be along the largest and the smallest, and patent patenting and modification are required

Page 9 519499 Brief Description of Drawings Figure 1 is a schematic diagram of the appearance of a pull cap with a groove. FIG. 2 is a schematic view of assembling a pull cap with a groove. FIG. 3 is a manufacturing sequence diagram of a conventionally produced grooved pull cap. FIG. 4 is a manufacturing sequence diagram of the pull cap molding method of the present invention.

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Claims (1)

519499 VI. Application for patent scope 1. A method for forming a pull cap, which includes cutting to a proper length a · diameter b · reshape with the number / r / r equal to the number C · make the material into d · will crack 2 · Rushen 3, Rushen 1 squeeze 4. Rushen roll material is cut to the center to form a recessed area, and the material is placed in a first into a rod-shaped mold. The holes and hollow cylindrical grooves make the strip concave; and the first extruded object of the first body shaft is used to fill the second-level hole body in the direction of the extrusion, and it is below the ear of the material body. Steps: a material body with a flat and enlarged ear at one end of the material body; in the mold, the first forming die and the second extrudate are axially squeezed by using the recessed area of the first material body 'A mold is formed in the inner diameter of the material, wherein the forming mold is a cylindrical inner diameter and a plurality of squares are provided along the axial direction of the material outward to form a compound in the material, In order to squeeze the material, please squeeze the material ear hole in the body; Then use the material-type mold to further form one thread forming hole at one end of the ear of the material, and use the other end of the second extruded material to extrude along the axial center to form the material at the ear of the material. A second molding die is inserted into one end of the part to squeeze the material axially, so that the groove of the material breaks the first extruded material and further squeezes the material along the material axially to form a pull cap. The method for forming a pull cap according to the first item of the invention, wherein the extruded material in step 1 is a plurality of rod-shaped objects with different inner diameters. The method for forming a pull cap according to item 2 of the utility model, wherein the third part is a rod-shaped object with three different inner diameters. The method of forming a pull cap according to item 1 Page 11 519499 6. The inner diameter of the first-class hole in the scope of patent application b is larger than the inner diameter of the second-stage hole. 5. As for the method of forming the pull cap described in item 1 of the scope of patent application, There is a section between the first-class hole and the second-class hole. 6. The method for forming a pull cap as described in item 1 of the scope of patent application, wherein the inner diameter of the thread forming hole in b is smaller than the inner diameter of the first class hole 7. The pull cap as described in item 1 of the scope of patent application The molding method, wherein d, the second molding die is a cylindrical hollow cylinder shorter in length than the material, and a large portion is provided in the radial direction of the inner diameter of the cylinder to allow the material to follow The swelling of the second molding die 8. The method of forming a pull cap as described in item 1 of the scope of patent application, wherein d, the material is squeezed along the axial direction of the material, so that the concave of the material is formed After pulling the cap, it can be further stretched along the axial direction of the material to restore the original outer diameter of the cap body. Medium step Medium step 〇 Medium step, and the shaft swells for a period. Middle step ditch rupture pull cap,