TWI854681B - Method of forming bolts for seat belt - Google Patents

Abstract

A method of forming bolts for seat belt includes a material preparation step, a first forming step, and a second forming step. In the first forming step, an end of a metal blank prepared in the material preparation step is formed to have a first head. The first head has a plurality of first recessed portions and a plurality of first protruding portions. The first recessed portions and the first protruding portions are arranged alternately. In the second forming step, a positioning device of a closing machine is adapted to position the first head, after that anther end of the metal blank is formed to have a second head. The second head has a plurality of second recessed portions corresponding to the first recessed portions and a plurality of second protruding portions corresponding to the first protruding portions to thereby precisely situate the second recessed portions at the first recessed portions and situate the second protruding portions at the first protruding portions without any deviation. Thus, the production yield rate is increased.

Description

Seat belt bolt forming method

The present invention relates to a bolt manufacturing method, in particular to a seat belt bolt forming method.

According to the research, fasteners are commonly found in various machinery, construction, and transportation assembly. They are usually made of metal and are cylindrical or in other specific shapes to fasten the parts together. The metal manufacturing process mainly involves heading, trimming, cutting, thread rolling, surface treatment, etc. For general special types of fasteners, for example, double-head fasteners used in car seat belts.

Referring to FIG. 1 , both ends of the double-headed fastener 1 must be of the same shape and symmetrical to each other. When the double-headed fastener 1 is manufactured, a first head portion 11 at one end is first formed by a stamping machine (not shown in the figure), and a metal rod having a plurality of first recesses 111 and first protrusions 112 arranged alternately is formed on the first head portion 11. Then, the metal rod is turned over and then placed back into the stamping machine to continuously form another second head portion 12. The second head portion 12 also has a plurality of second recesses 121 and second protrusions 122 arranged alternately. The second concave portion 121 and the second convex portion 122 on the second head portion 12 should be symmetrical with the first concave portion 111 and the first convex portion 112. In the actual manufacturing process, it is found that during the molding process of the second head portion 12, it is easy to be deflected by the clamping and feeding process of the punch molding machine, resulting in the second concave portion 121 and the second convex portion 122 on the second head portion 12 being difficult to correspond to the first concave portion 111 and the first convex portion 112. This cannot meet the customer's requirements for product quality and greatly reduce the defective rate of the product production process. There is room for improvement.

Therefore, the purpose of the present invention is to provide a method for forming a safety belt bolt, which can greatly improve the production yield of the product.

Therefore, the seat belt bolt forming method of the present invention includes a material preparation step, a first forming step and a second forming step; wherein the first forming step is to form a first head portion at one end of the metal bar prepared in the material preparation step, and the first head portion is formed with a plurality of first concave portions and first convex portions arranged alternately; and the second forming step is to prepare a positioner for positioning the aforementioned metal bars, wherein the positioner is provided with a positioning groove for positioning the metal bar, and the positioning groove is formed with a plurality of grooves, so as to facilitate the first head of the metal bar to be positioned. The first protrusions of the head can be locked and positioned in the grooves and the positioning slots, and the other end of the metal rod relative to the first head can be clamped by the processing molds. Therefore, the first head is first positioned and fixed through the second forming step and then the second head is formed. The second recess on the second head can be accurately controlled to correspond to the first recess on the first head, and the second protrusion on the second head can correspond to the position of the first protrusion of the first head, so that the first head and the second head are ensured to be symmetrical, and the quality after production can be ensured to improve the production yield.

The other technical contents, features and effects of the present invention mentioned above will be clearly understood in the following detailed description of the preferred embodiment with reference to the drawings.

Referring to FIG. 2 to FIG. 4, a preferred embodiment of the seat belt bolt forming method 3 of the present invention includes a material preparation step 31, a first forming step 32, and a second forming step 33; wherein the material preparation step 31 is provided with a metal bar 5, and the metal bar 5 is in a cylindrical state, and the present embodiment is described below using a cylinder as an example; in addition, the first forming step 32 is provided with a metal bar 5 having a cylindrical state; A punch forming machine 4, the punch forming machine 4 has a forming die 41, and a punching die 42 (not shown) corresponding to the forming die 41, so that one end of the metal bar 5 is clamped by the forming die 41, and the punching die 42 is used to form a first head 51 on one end of the metal bar 5, and a plurality of first concave portions 511 and first convex portions 512 are formed on the first head 51 in an alternating manner.

As mentioned above, the second forming step 33 is equipped with a clamping machine 6, which has a pair of processing dies 61 that are opened and closed in a transverse direction, a forming die 62 for stamping the processing dies 61, and a positioner 7 for positioning the metal bars 5, wherein the positioner 7 is provided with a positioning groove 71 for positioning the metal bar 5, and the positioning groove 71 is formed with a plurality of grooves 72 to facilitate the first head 51 of the metal bar 5 to be positioned. The protrusion 512 can be locked and positioned in the grooves 72 and the positioning slot 71, and the other end of the metal rod 5 opposite to the first head 51 can be clamped by the processing dies 61 and punched by the forming punch 62. A second recess 521 corresponding to the position of the first recess 511 and a second protrusion 522 corresponding to the position of the first protrusion 512 are formed on the second head 52, which means that the shape and position of the second head 52 are the same as those of the first head 51.

Referring to FIG. 2 to FIG. 4 , during the manufacturing process, the metal rod 5 in the material preparation step 31 is first formed into a desired shape or length, such as a round rod in the present embodiment, and then the first forming step 32 is performed by using the punch forming machine 4 to clamp one end of the metal rod 5 by the forming die 41, and the punch 42 impacts the one end of the metal rod 5 to form the first head 51 of the same shape as the forming die 41. At the same time, the first head portion 51 is formed with a plurality of first concave portions 511 and first convex portions 512 arranged alternately, and then the metal bar 5 obtained after the first forming step 32 is input into a mold clamping machine 6, and the position of the first head portion 51 is positioned by the locator 7, that is, the positioning groove 71 of the locator 7 is formed with a plurality of grooves 72, so that the first convex portions 512 of the first head portion 51 are It can be positioned in the grooves 72 and the positioning grooves 71, and the other end of the metal rod 5 is clamped by the processing dies 61 and punched by the forming punch 62 to form the second head 52, on which a second recess 521 is formed relative to the position of the first recess 511, and a second protrusion 522 is formed relative to the position of the first protrusion 512; therefore, the first head 51 can be restricted and fixed by the positioner 7, and then the second head 52 is formed. In this way, in the fixed state, during the process of forming the second head 52, the positions of the second recess 521 and the second protrusion 522 relative to the first recess 511 and the first protrusion 512 can be accurately controlled, so that the first head 51 and the second head 52 are symmetrically positioned, effectively ensuring the production yield.

In summary, the safety belt bolt forming method of the present invention includes a material preparation step, a first forming step and a second forming step, wherein the second forming step is provided with a positioner for positioning the metal bars formed in the first forming step, so that the first protrusions of the first head of the metal bar can be locked and positioned in the grooves and the positioning slots, and the metal bar is relatively The other end of the part can be clamped by the processing dies and punched by the forming die. A second concave portion relative to the position of the first concave portion and a second convex portion relative to the position of the first convex portion are formed on the second head. Through the design of the positioner, it can be ensured that the first head and the second head are symmetrical, which can ensure the quality after production and improve the production yield, thereby achieving the purpose of the present invention.

However, the above is only to illustrate the preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. In other words, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope of the patent of the present invention.

[Knowledge] 111: First concave portion 112: First convex portion 121: Second concave portion 122: Second convex portion [Invention] 3: Seat belt bolt forming method 31: Material preparation step 32: First forming step 33: Second forming step 4: Stamping machine 41: Forming die 42: Punch die 5: Metal bar 51: First head 511: First concave portion 512: First convex portion 52: Second head 521: Second concave portion 522: Second convex portion 6: Mold clamping machine 61: Processing die 62: Forming punch die 7: Positioner 71: Positioning groove 72: Clamping groove

Figure 1 is a three-dimensional schematic diagram of a double-head fastener.

Figure 2 is a flow chart of a preferred embodiment of the present invention.

Figures 3 and 4 are action flow charts of a preferred embodiment of the present invention.

3: Seat belt bolt forming method

31: Preparation steps

32: First molding step

33: Second molding step

Claims (1)

A method for forming a seat belt bolt comprises: a material preparation step, which is provided with a metal bar; a first forming step, which is provided with a stamping machine, which has a forming die and a punching die corresponding to the forming die, so that one end of the metal bar is clamped by the forming die, and the punching die is used to form a first head portion on the one end of the metal bar, and a plurality of first concave portions and first convex portions are formed on the first head portion in an alternating manner; and a second forming step, which is provided with a die clamping machine, which has a pair of processing dies that are opened and closed laterally, and a die that is punched for the processing dies. A forming die for forming, and a positioner for positioning the aforementioned metal bars, wherein the positioner is provided with a positioning groove for positioning the metal bar, and the positioning groove is formed with a plurality of grooves, so that the first protrusions of the first head of the metal bar can be clamped and positioned in the grooves and the positioning grooves, and the other end of the metal bar opposite to the first head can be clamped by the processing dies and pressed by the forming die to form a second head, and the second head is formed with a second concave portion corresponding to the first concave portion and a second convex portion corresponding to the first convex portion.

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