TWI531429B - Hand tool forming method - Google Patents

Description

Hand tool forming method

The present invention relates to a hand tool forming method, and more particularly to a cold forging processing method using press forming and roll forming.

According to the conventional production of hand tools such as wrenches, the round bar type strips of predetermined length are first cut, and then the round bar type strips are heated to red to make the temperature exceed the temperature of eight hundred degrees or more, and hot forging is performed. The rod type strip is softened, and then the softened round bar type strip is pressed and forged by the upper mold and the lower mold to form a wrench blank, and the surface of the wrench blank is formed by forging after being cooled. The material is punched, so that the waste around the blank of the wrench can be eliminated to form a wrench body, and then heat treatment and surface treatment are performed, and the finished product can be completed.

It is not difficult to find out the shortcomings of the above-mentioned conventional structure. The main reasons are as follows: (1) The conventional steps must first warm the round bar type to more than eight Baidu, and the clamping press forging After forming, the wrench blank is still in a high temperature state, so it has to wait for it to cool, so as to facilitate the subsequent processing, but the process of waiting for cooling is quite time consuming, affecting the entire production schedule, resulting in complicated and inconvenient manufacturing methods. Increase the time to complete the finished product, not economically beneficial.

(2) The forged wrench material will produce excess waste in the periphery, which accounts for 50% of the entire round bar type strip, which wastes too much material, and the high temperature wrench material is lowered to room temperature. When a decarburized layer is formed on the outer surface of the wrench blank, the so-called crucible, the decarburized layer must be removed by manual grinding, which increases the labor cost. The raw materials and processing costs remain high and are not economically viable.

(3) The waste material is wrapped around the periphery of the wrench blank to form a clamp on the clamping, so that the wrench blank cannot be effectively fixed on the fixture for the purpose of removing the waste, so it must be manually ground to remove the waste. Not only does it cost labor to waste labor costs, but also because the thickness control of the scrap is not easy, often the size tolerance of each wrench blank after forging is too large, the dimensional accuracy is not good, and the product defect rate is too large, forming a process A big problem on the.

(1) According to the conventional hand tool forming step, the round bar type strip must be heated to above 8 Baidu, and after the clamping press forging and forming, the wrench blank is still in a high temperature state, so it is necessary to wait. It is cooled to facilitate subsequent processing operations, but the process of waiting for cooling is quite time consuming, affecting the entire production schedule, resulting in complicated and inconvenient manufacturing methods, thereby increasing the time for completion of the finished product, and not economically beneficial.

(2) The forged wrench material will produce excess waste in the periphery, which accounts for 50% of the entire round bar type strip, which wastes too much material, and the high temperature wrench material is reduced to the chamber. The warm time system will produce a decarburization layer on the outer surface, which is called so-called enamel. This decarburization layer must be removed by the manual grinding process, which increases the labor cost, resulting in high raw materials and processing costs, and no economics. Benefits.

(3) The waste material is wrapped around the periphery of the wrench blank to form a clamp on the clamping, so that the wrench blank cannot be effectively fixed on the fixture for the purpose of removing the waste, so it must be manually ground to remove the waste. Not only does it cost labor, but also wastes labor costs, and because of the difficulty in controlling the thickness of the scrap, it often makes forging The dimensional tolerance of each of the spanners after punching is too large, and the dimensional accuracy is not good, which in turn causes the product defect rate to be too large, which causes a great trouble in the process. The above is the technical problem to be solved by the present invention.

The invention provides a hand tool forming method, which comprises the following steps: press forming, forming a blank of a selected thickness of a sheet by a punching machine and dropping it, and the blank has better surface smoothness by stamping; rolling Forming, feeding the stamped blank into a rolling mill for secondary processing, and the rolling mill has two corresponding rolling dies, and the rolling surface of the two rolling dies is relatively concave and has a rolling die. Thereby, the embryo product is extrusion-stretched, and the burrs formed by the stamping are further pressed and flattened to form a finished hand tool.

(1) The hand tool of the invention can be formed by the stamping forming and rolling forming steps of the cold forging technology, so that the working steps of the overall manufacturing are less, the labor cost is effectively reduced, and the speed of the product production can be accelerated, and further, Increase the number of finished products.

(2) When the blanks of the hand tools are stamped and produced, the shape to be formed on the plate is pressed by a press machine, so that the preforms are not formed with excess burrs and wastes, and the waste is effectively reduced. The production, and the waste of materials and the cost of production, and the stamping is processed in a normal temperature working environment, without decarburization and enthalpy after high heat cooling, to increase the integrity of the finished hand tools and Dimensional precision.

(3) The hand tool uses the stamping forming method to have better surface smoothness, effectively reduce the formation of burrs, and then use roll forming extrusion and stretching to complete the hand tool and roll forming. During processing, the embryonic product can be further shaped and shaped by the extrusion of the rolling die to remove the edge edges and burrs, thereby causing plastic flow so as to be thick. And the density changes to improve the structural strength of the finished product.

(10)‧‧‧ Stamping

(11)‧‧‧ punching machine

(20)‧‧‧Roll forming

(21)‧‧‧Rolling mill

(22)‧‧‧Rolling die

(221)‧‧‧Rolling cavity

(222) ‧ ‧ engraved convex

(A) ‧‧‧ plates

(B) ‧‧ ‧ embryos

(C) ‧‧‧Hand tools

Fig. 1 is a block diagram showing the steps of the molding method of the present invention.

Fig. 2 is a schematic view showing the processing of the stamping of the present invention.

Fig. 3 is a schematic view showing a rolling mill of the present invention.

Fig. 4 is a schematic view showing the processing of roll forming of the present invention.

Figure 5 is a schematic view of the finished state of the present invention.

In order to enable your review committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [simplified description of the drawings] as follows: First, please refer to Figure 1 to match 2, 3, 4, 5 shows a hand tool forming method comprising the following steps: press forming (10), pressing a plate (A) of a selected thickness by press (11) to form a blank (B) and dropping the concentrated And the blank (B) has a better surface smoothness due to press forming; roll forming (20), feeding the stamped blank (B) to a rolling mill (21) for rolling, and the rolling mill (21) having two corresponding rolling dies (22), and the rolling surface of the two rolling dies (22) is relatively concavely provided with a rolling die (221), thereby squeezing the blank (B) Pressing and drawing, and the blank (B) is further pressed and flattened by the burrs formed by the stamping, and the finished product (C) is formed, and the inner wall of the rolling die (221) of the rolling die (22) is further formed. It can be matched with an engraved convex portion (222), so that after the hand tool is rolled and formed, the surface of the hand tool can be formed with a note mark or a print, and the name; Finished (C) after forming the vibration system can be further polishing and surface treatment, adding other hand finished tool (C) of the surface appearance were.

With the structure of the above specific embodiment, the following benefits can be obtained: According to the structure of the above specific embodiment, the following benefits can be obtained: (1) The hand tool of the present invention is formed by cold forging (10) and The roll forming (20) step can be used to make the molding, so that the overall manufacturing steps are less, the labor cost is effectively reduced, and the speed of the product production can be accelerated, thereby increasing the quantity of the finished product; (2) the blank of the hand tool (B) When the stamping is produced, the shape to be formed on the sheet (A) is pressed by a press (11), so that the blank (B) is not formed and no excess burrs or scraps are generated in the periphery. Reduce the generation of waste, save material waste and cost of production, and the stamping and forming (10) is processed under normal temperature working environment, and there will be no decarburization and enthalpy after high heat drop to add hand tools. The integrity and dimensional precision of the finished product (C); (3) The hand tooling method of the hand tool (10) has better surface smoothness, effectively reduces the formation of burrs, and then uses roll forming (20) to squeeze Pressure, stretching, energy When the finished tool (C) is finished and the processing of roll forming (20) is performed, the blank (B) can be further removed by extrusion of the rolling die (22) to remove edge edges and burrs. The product (B) is shaped and shaped to cause plastic flow so that the thickness and density change to improve the structural strength of the finished product.

In summary, the present invention has indeed achieved a breakthrough structural design, and has improved invention content, and at the same time, can achieve industrial utilization and progress, and the present invention is not found in any publication, but also novel, when In accordance with the provisions of the relevant laws and regulations of the Patent Law, the application for invention patents is filed according to law, and the examination authority of the bureau is required to grant legal patent rights.

The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; that is, the equivalent variations and modifications made by the scope of the present invention should still belong to the present invention. Within the scope of the patent.

(10)‧‧‧ Stamping

(20)‧‧‧Roll forming

(A) ‧‧‧ plates

(B) ‧‧ ‧ embryos

(C) ‧‧‧Hand tools

Claims (3)

A hand tool forming method comprises the following steps: press forming, forming a blank of a selected thickness of a sheet by a punching machine and dropping it, and the blank has a better surface smoothness by stamping; rolling forming, stamping The formed blank is sent to a rolling mill for secondary processing, and the rolling mill has two corresponding rolling dies, and the rolling surface of the two rolling dies is relatively concave with a rolling die, thereby the embryo The product is extruded and stretched, and the burrs formed by the stamping are further pressed and flattened to form a finished hand tool. According to the hand tool forming method of claim 1, wherein: the inner wall of the rolling die of the rolling die is matched with an engraved convex portion, so that the surface of the hand tool can be formed with a note after the finished product is formed. Logo or print, name. According to the hand tool forming method of claim 1, wherein the hand tool is finished after being subjected to vibration polishing and surface treatment.