Method for manufacturing lock key for self-locking screw sleeve with key

Abstract

The invention discloses a method for manufacturing a lock key for a self-locking screw sleeve with a key. The method comprises the following steps: preparing a mold for manufacturing the lock key, selecting raw materials, assembling a lock key forming mold device, rolling and forming by a lock key forming mold, cutting materials, flattening and forming by a flattening mold, and trimming by a trimming mold to obtain a final product. The lock keys made of different materials, with different sections and with different sizes and thicknesses can be processed by utilizing conventional processing equipment through proper molds and processing technologies, and the processed lock keys have the characteristics of conformal distribution of fiber directions, completeness, safety, reliability, high mechanical property, long service life, high temperature resistance, high pressure resistance, corrosion resistance, few machining excess materials, material saving and low cost. And meanwhile, the machining period is short, the machining efficiency is high, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of parts manufacturing, in particular to a method for manufacturing a locking key for a keyed self-locking screw sleeve. Background Art

[0002] Keyed self-locking screw inserts are widely used in military industry, aerospace, etc. For products with high thread strength requirements, keyed self-locking screw inserts are mainly locked by locking keys, so the processing of locking keys is very important. Traditionally, wire cutting is used for key processing, which has low processing efficiency and low material utilization. In addition, since the internal fiber direction is cut off during the processing, bending or breaking often occurs during the assembly process, and its comprehensive mechanical properties and service life are not high, and the product quality is unstable. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a key manufacturing method for a keyed self-locking screw sleeve with a key, which has high processing efficiency and material utilization, shape-matching and complete fiber direction of parts, small machining allowance, high mechanical properties and service life, and stable product quality.

[0004] The purpose of the present invention is achieved through the following technical solutions: A method for manufacturing a key for a keyed self-locking screw sleeve comprises the following steps: Step 1: Prepare a mold for making a lock key, which includes a lock key forming mold, a lock key forming roller, a lock key forming handle, a lock key forming handle shaft and a lock key flattening mold; the lock key forming mold is a disc-shaped structure, and its circumferential surface is concave to form a circle of forming grooves; the lock key forming roller is also a disc-shaped structure; the lock key forming handle and the lock key forming handle shaft are both slender cylindrical structures; the surface of the lock key flattening mold is concave to form a flattening groove.

[0005] Step 2: Select cold drawn stainless steel wire as raw material.

[0006] Step 3: On an ordinary lathe, fix the key forming mold with a chuck installed on the lathe spindle, so that the molding groove of the key forming mold is located outside the chuck, and then rotate the key forming roller on one end of the key forming handle through the key forming handle shaft, and then fix the other end of the key forming handle on the lathe tool holder mounting plate, so that the key forming roller and the key forming mold are arranged side by side, and at the same time, the circumferential surface of the key forming roller is aligned with the molding groove of the circumferential surface of the key forming mold.

[0007] Step 4: After starting the lathe, the lathe spindle drives the key forming die to rotate. By adjusting the key forming tool handle and controlling the gap between the key forming roller and the key forming die, the cold-drawn stainless steel wire is fed into the forming groove of the key forming die. Through the mutual extrusion between the key forming die and the key forming roller, the cold-drawn stainless steel wire is subjected to the rolling pressure applied by the key forming die and the key forming roller to realize the forming of the outer cross-section, and obtain the stainless steel wire blank after rolling by the key forming die.

[0008] Step 5: After all cross-sections of the cold-drawn stainless steel wire are formed, it is cut into specified lengths on a punching machine.

[0009] Step 6: Then install the key-locking flattening die on the punching machine, put the cut blank into the flattening groove of the key-locking flattening die for flattening to obtain the stainless steel wire blank formed by the flattening die.

[0010] Step 7: Install the trimming die on the punching machine, put the flattened blank into the trimming die for trimming, and obtain the final product that meets the required size after trimming by the trimming die.

[0011] The present invention utilizes conventional processing equipment and can process lock keys of different materials, different cross-sections, and different sizes and thicknesses through appropriate molds and processing technologies. The processed lock keys have shape-matching fiber directions and are complete, safe and reliable, have high mechanical properties and service life, and have high temperature resistance, high pressure resistance, and corrosion resistance. In addition, there is less mechanical processing waste, material saving, and high material utilization rate. At the same time, the processing cycle is short, the processing efficiency is high, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a structural schematic diagram of the key-locking forming mold of the present invention.

[0014] Figure 2 It is a schematic structural diagram of the key-locking forming roller of the present invention.

[0015] Figure 3 It is a schematic structural diagram of the key-locking molded knife handle of the present invention.

[0016] Figure 4 It is a schematic structural diagram of the key-locking forming tool handle shaft of the present invention.

[0017] Figure 5 It is a schematic structural diagram of the assembled key locking molding die device of the present invention.

[0018] Figure 6 It is a schematic structural diagram of the stainless steel wire blank after rolling by the key-locking forming die according to the present invention.

[0019] Figure 7 It is a schematic structural diagram of the key-locking flattening die of the present invention.

[0020] Figure 8 It is a schematic structural diagram of the stainless steel wire blank after being formed by a flattening die according to the present invention.

[0021] Fig. 9 It is a schematic structural diagram of the final product after trimming and die trimming according to the present invention.

[0022] As shown in the figure: 1-key-locking forming die, 101-forming groove, 2-key-locking forming roller, 3-key-locking forming handle, 301-U-shaped notch, 4-key-locking forming handle shaft, 5-stainless steel wire blank after rolling by key-locking forming die, 6-key-locking flattening die, 601-flattening groove, 7-stainless steel wire blank after forming by flattening die, 8-final product after trimming by trimming die. DETAILED DESCRIPTION

[0023] The following is an explanation of the implementation of the present invention by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0026] This embodiment provides a method for manufacturing a key for a keyed self-locking screw sleeve, which is characterized by comprising the following steps: Step 1: Prepare the mold for key manufacturing: Figure 1-4 and Figure 7 As shown, the mold for manufacturing the key comprises a key forming mold 1, a key forming roller 2, a key forming handle 3, a key forming handle shaft 4 and a key flattening mold 6; the key forming mold 1 is a disc-shaped structure, and its circumferential surface is concave to form a circle of forming grooves 101, and the cross section of the forming grooves 101 is a W-shaped structure; the key forming roller 2 is also a disc-shaped structure; the key forming handle 3 and the key forming handle shaft 4 are both slender cylindrical structures, and one end of the key forming handle 3 is provided with a U-shaped notch 301; the surface of the key flattening mold 6 is concave to form a flattening groove 601; Step 2: Raw material selection: Cold-drawn stainless steel wire with a tensile strength of 860-950MPa is selected as the raw material. This kind of raw material has sufficient plasticity to enable it to be fully deformed in the future, and can ensure a certain strength after subsequent forming, which is convenient for subsequent smooth cutting and trimming, while also ensuring the strength and bending resistance of the final product of 1200MPa.

[0027] Step 3: Assemble the key-locking forming mold device: fix the key-locking forming mold 1 on an ordinary lathe with a chuck installed on the lathe spindle. The key-locking forming mold 1 is coaxially arranged with the lathe spindle, and the concentricity of the key-locking forming mold and the lathe spindle is ≤0.02mm, so that the molding groove 101 of the key-locking forming mold 1 is located outside the chuck (not blocked by the chuck), and then the key-locking forming roller 2 is rotated and installed in the U-shaped notch 301 of the key-locking forming tool handle 3 through the key-locking forming tool handle shaft 4, and then the other end of the key-locking forming tool handle 3 is fixed on the lathe tool holder mounting plate, so that the key-locking forming roller 2 and the key-locking forming mold 1 are side by side and parallel to each other, and at the same time, the circumferential surface of the key-locking forming roller 2 is aligned with the molding groove 101 of the circumferential surface of the key-locking forming mold 1, so as to form a mold as shown in the figure. Figure 5 In the assembled key forming mold device shown, the parallelism between the key forming roller 2 and the key forming mold 1 is ≤0.01mm.

[0028] Step 4: Rolling forming by key forming die: After starting the lathe, the lathe spindle drives the key forming die 1 to rotate, and the gap between the key forming roller 2 and the key forming die 1 is controlled by adjusting the key forming tool handle 3, and the cold-drawn stainless steel wire is fed into the forming groove 101 of the key forming die 1 (between the key forming roller 2 and the key forming die 1). Through the mutual extrusion between the key forming die 1 and the key forming roller 2, the cold-drawn stainless steel wire is subjected to the rolling pressure applied by the key forming die 1 and the key forming roller 2 to realize the forming of the outer cross section, and the result is as shown in the figure. Figure 6The stainless steel wire blank is shown after being rolled by the key-locking forming die; at the same time, the friction between the cold-drawn stainless steel wire and the key-locking forming die 1 and the key-locking forming roller 2 is used to achieve subsequent automatic feeding.

[0029] Step 5: Cutting: After all cross-sections of the cold-drawn stainless steel wire are formed, it is cut into specified lengths on a punching machine.

[0030] Step 6: Flattening mold: Then install it on the punching machine. Figure 7 After the key flattening die 6 is pressed, the blank after cutting is placed in the flattening groove 601 of the key flattening die 6 for flattening and forming, and the blank is obtained as shown in FIG. Figure 8 The stainless steel wire billet is shown after being formed by a flattening die.

[0031] Step 7: The trimming die is installed on the punching machine, and the blank after flattening is placed between the trimming dies for trimming and forming. Fig. 9 The final product after trimming and die trimming is shown, and meets the required size. After the key for self-locking screw insert with key is manufactured, it has good comprehensive mechanical properties, qualified macro and micro structures, strong corrosion resistance, complete fiber streamlines, and small excess processing, that is, it is made into a lock key for self-locking screw insert.

[0032] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0033] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a key for a keyed self-locking screw insert, characterized in that: The following steps are involved: Step 1: prepare a mold for manufacturing a lock key, which includes a lock key forming mold, a lock key forming roller, a lock key forming handle, a lock key forming handle shaft and a lock key flattening mold; the lock key forming mold is a disc-shaped structure, and its circumferential surface is concave to form a circle of forming grooves; the lock key forming roller is also a disc-shaped structure; the lock key forming handle and the lock key forming handle shaft are both slender cylindrical structures; the surface of the lock key flattening mold is concave to form a flattening groove; Step 2: Select cold drawn stainless steel wire as raw material; Step 3: Fix the key forming mold with a chuck installed on the lathe spindle on an ordinary lathe so that the molding groove of the key forming mold is located outside the chuck, and then rotate the key forming roller on one end of the key forming handle through the key forming handle shaft, and then fix the other end of the key forming handle on the lathe tool holder mounting plate, so that the key forming roller and the key forming mold are arranged side by side, and at the same time, the circumferential surface of the key forming roller is aligned with the molding groove of the circumferential surface of the key forming mold; Step 4: After starting the lathe, the lathe spindle drives the key forming die to rotate, and the gap between the key forming roller and the key forming die is controlled by adjusting the key forming tool handle, and the cold-drawn stainless steel wire is fed into the forming groove of the key forming die. Through the mutual extrusion between the key forming die and the key forming roller, the cold-drawn stainless steel wire is subjected to the rolling pressure applied by the key forming die and the key forming roller, so as to realize the forming of the outer cross section, and obtain the stainless steel wire blank after rolling by the key forming die; Step 5: After all cross sections of the cold-drawn stainless steel wire are formed, it is cut into pieces according to the specified length on a punching machine; Step 6: After the key-locking flattening die is installed on the punching machine, the cut blank is placed into the flattening groove of the key-locking flattening die for flattening to obtain a stainless steel wire blank formed by the flattening die; Step 7: Install the trimming die on the punching machine, put the flattened blank into the trimming die for trimming, and obtain the final product that meets the required size after trimming by the trimming die.

2. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: The cross section of the forming groove in step 1 is a W-shaped structure.

3. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: The tensile strength of the cold-drawn stainless steel wire selected in step 2 is 860-950 MPa.

4. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: In step 3, the concentricity between the key-locking forming die and the lathe spindle is ≤0.02mm.

5. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: In step 3, the key-locking forming roller and the key-locking forming die are parallel to each other.

6. The method for manufacturing a key for a keyed self-locking screw insert according to claim 5, characterized in that: In step 3, the parallelism between the key-locking forming roller and the key-locking forming die is ≤0.01mm.

7. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: In step 4, the friction between the cold-drawn stainless steel wire and the key-locking forming die and the key-locking forming roller is utilized to realize subsequent automatic feeding.

8. The method for manufacturing a key for a keyed self-locking screw insert according to claim 1, characterized in that: A U-shaped notch is arranged at one end of the key-locking forming tool handle for installing the key-locking forming roller, and the key-locking forming roller is rotatably installed in the U-shaped notch of the key-locking forming tool handle through the key-locking forming tool handle shaft.

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