Machining method of metal lock washer

Abstract

The invention provides a processing method of a metal lock washer, which comprises the following steps: using a wire with the same diameter as the cross section of the metal lock washer, using a spring winding machine to make the wire into a torsion spring, the outer diameter of the torsion spring is the same as the outer diameter of the metal lock washer, and the inner diameter of the torsion spring is the same as the inner diameter of the metal lock washer; the manufactured torsion spring is put into heat treatment equipment to be stably formed, and shape and size changes caused by torsion release are prevented; a special clamping tool is designed and manufactured and used for clamping the torsional spring by a linear cutting machine tool; the torsion spring is cut open through a linear cutting machine tool, the cutting angle is the same as the opening angle of the metal lock washer, and the remaining part is the needed metal lock washer; and the metal lock washer is blunted and deburred.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method of a metal stop washer. Background Art

[0002] In aerospace products, non-standard metal stop washers are often used. According to traditional processing methods, it is necessary to design bending tooling, and then use wire to bend and form according to the shape of the tooling. This method can only process one product at a time, and springback is prone to occur after forming, so secondary bending and forming are required. For small-batch production needs, this method has a slow production speed. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the existing processing methods and provide a processing method for a metal stop washer. The processing method process is universal for similar parts and can achieve the effect of shortening the cycle and reducing costs.

[0004] The technical solution provided by the present invention is as follows: a method for processing a metal stop washer, comprising:

[0005] Making torsion springs;

[0006] The manufactured torsion spring is subjected to heat treatment for stable forming;

[0007] Make clamping tools for wire cutting machine tools;

[0008] Use a wire cutting machine to cut the torsion spring to form the retaining washer.

[0009] The method for making a torsion spring comprises: using a wire material with the same cross-sectional diameter as the metal stop washer, using a spring winding machine to make the wire material into a torsion spring, wherein the outer diameter of the torsion spring is the same as the outer diameter of the metal stop washer, and the inner diameter of the torsion spring is the same as the inner diameter of the metal stop washer; and the coils are tightly wound during winding.

[0010] The clamping tooling includes: a base, a core shaft and a pressure plate; the core shaft is installed inside the base and is used to position and constrain the inner diameter of the torsion spring; one end of the core shaft is connected to the base through a thread, and the other end is fixed to the pressure plate installed on the top of the base through a fastener; the pressure plate is used to fix the torsion spring on the tooling to prevent the cut retaining washer from scattering.

[0011] The effective length of the mandrel is the height of the torsion spring.

[0012] A fan-shaped notch is cut on the outside of the base to avoid the path of subsequent wire cutting.

[0013] The notch angle range is greater than the opening angle that the metal retaining washer ultimately needs to be cut through.

[0014] The method of using a wire cutting machine to cut a torsion spring to form a stop washer includes: screwing a core shaft onto a tooling base, using the wire cutting machine to cut a fan-shaped avoidance gap on the tooling as a whole, wherein the range of the gap is larger than the angle range that the final metal stop washer needs to be cut; installing the torsion spring into the tooling, fixing a pressure plate, and using the wire cutting machine to cut according to the opening angle of the stop washer to form the stop washer.

[0015] The method of installing the torsion spring into the tooling and fixing the pressure plate includes: inserting the torsion spring onto the tooling mandrel, installing the pressure plate on the top, fixing the pressure plate on the base with fastening screws, and after tightening, the torsion spring should be in a compressed state in the tooling.

[0016] The method of using a wire cutting machine to cut according to the opening angle of the stop washer includes: fixing the tooling together with the torsion spring to the wire cutting machine, and aligning the tooling base as a reference; the wire cutting machine cuts the torsion spring along the final opening angle of the metal stop washer, and avoiding the existing fan-shaped avoidance gap on the tooling during cutting.

[0017] After the torsion spring is cut by the wire cutting machine to form the stop washer, the cut metal stop washer is deblunted and deburred, and then cleaned.

[0018] The advantages of the present invention compared with the prior art are: general metal stop washers are circular opening structures, and conventional processing methods require the design of bending tooling, which is manually bent and formed by workers using the tooling, resulting in low processing efficiency and poor forming quality; the present invention no longer uses tooling for forming, but first uses a spring winding machine to wind and form multiple turns of springs according to the method of processing springs, and then uses a wire cutting method to cut the spring according to the opening angle of the stop washer, so that each turn of the spring naturally forms a stop washer; this method has extremely high processing efficiency, can form multiple pieces at one time, and eliminates manual errors, and has good processing quality consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The metal stop washer of the present invention;

[0020] Figure 2 It is a torsion spring made of wire;

[0021] Figure 3 Schematic diagram of the clamping tooling used to make wire cutting machine tools.

[0022] Figure 4 Schematic diagram of the cutting process using a wire cutting machine. DETAILED DESCRIPTION

[0023] The present invention provides a method for processing a metal stop washer. The metal stop washer has a simple structure and is a rotary structure. Therefore, it can be processed by using an existing spring winding machine and a wire cutting machine tool through a method of winding the whole and then cutting and forming. The method comprises:

[0024] As attached Figure 1 As shown, the metal stop washer is an open ring structure, its cross section is circular, and its raw material is wire;

[0025] As attached Figure 2 As shown, on a spring winding machine, the wire is wound into a torsion spring 3, the inner diameter of the torsion spring is the same as the inner diameter of the metal stop washer, the outer diameter of the torsion spring is the same as the outer diameter of the metal stop washer, and the coils are as dense as possible and tightly wound;

[0026] like Figure 3 As shown, a set of clamping tooling for wire cutting is designed according to the wound torsion spring. The tooling consists of a base 2, a mandrel 1, a pressure plate 4, and a fastening screw 5. The mandrel and the base are connected by threads. The effective length of the mandrel is the height of the torsion spring. The mandrel is screwed into the base. After tightening, a fan-shaped notch is cut on the outside using a wire cutting machine. The notch angle range should be larger than the final opening angle of the metal stop washer. The notch is used to avoid the path of subsequent wire cutting.

[0027] like Figure 4 As shown, insert the torsion spring onto the tooling mandrel, install a pressure plate on top, and use the fastening screws to fix the pressure plate on the base. After tightening, the torsion spring should be in a compressed state in the tooling;

[0028] Fix the tooling together with the torsion spring to the wire cutting machine, and align them with the tooling base as the reference; the wire cutting machine cuts the torsion spring along the final opening angle of the metal stop washer to avoid the existing fan-shaped avoidance groove on the tooling;

[0029] Unscrew the fastening screws, remove the pressure plate, use a screwdriver to take out the cut torsion spring from the tooling, and clean the tooling;

[0030] Install the next torsion spring and repeat the wire cutting operation until all processing is completed;

[0031] The cut metal stop washers are handed over to the bench operator for deburring and cleaning of the products.

Claims

1. A method for processing a metal stop washer, characterized in that: include: Making torsion springs; The manufactured torsion spring is subjected to heat treatment for stable forming; Make clamping tools for wire cutting machine tools; Use a wire cutting machine to cut the torsion spring to form the retaining washer.

2. A method for processing a metal retaining washer according to claim 1, characterized in that: The method for making a torsion spring comprises: using a wire material with the same cross-sectional diameter as the metal stop washer, using a spring winding machine to make the wire material into a torsion spring, wherein the outer diameter of the torsion spring is the same as the outer diameter of the metal stop washer, and the inner diameter of the torsion spring is the same as the inner diameter of the metal stop washer; and the coils are tightly wound during winding.

3. A method for processing a metal retaining washer according to claim 1, characterized in that: The clamping tooling includes: a base, a core shaft and a pressure plate; the core shaft is installed inside the base and is used to position and constrain the inner diameter of the torsion spring; one end of the core shaft is connected to the base through a thread, and the other end is fixed to the pressure plate installed on the top of the base through a fastener; the pressure plate is used to fix the torsion spring on the tooling to prevent the cut retaining washer from scattering.

4. A method for processing a metal retaining washer as claimed in claim 3, characterized in that: The effective length of the mandrel is the height of the torsion spring.

5. A method for processing a metal retaining washer as claimed in claim 1, characterized in that: A fan-shaped notch is cut on the outside of the base to avoid the path of subsequent wire cutting.

6. A method for processing a metal retaining washer as claimed in claim 5, characterized in that: The notch angle range is greater than the opening angle that the metal retaining washer ultimately needs to be cut through.

7. A method for processing a metal retaining washer as claimed in claim 3, characterized in that: The method of using a wire cutting machine to cut a torsion spring to form a stop washer includes: screwing a core shaft onto a tooling base, using the wire cutting machine to cut a fan-shaped avoidance gap on the tooling as a whole, wherein the range of the gap is larger than the angle range that the final metal stop washer needs to be cut; installing the torsion spring into the tooling, fixing a pressure plate, and using the wire cutting machine to cut according to the opening angle of the stop washer to form the stop washer.

8. A method for processing a metal retaining washer as claimed in claim 7, characterized in that: The method of installing the torsion spring into the tooling and fixing the pressure plate includes: inserting the torsion spring onto the tooling mandrel, installing the pressure plate on the top, fixing the pressure plate on the base with fastening screws, and after tightening, the torsion spring should be in a compressed state in the tooling.

9. A method for processing a metal retaining washer as claimed in claim 7, characterized in that: The method of using a wire cutting machine to cut according to the opening angle of the stop washer includes: fixing the tooling together with the torsion spring to the wire cutting machine, and aligning the tooling base as a reference; the wire cutting machine cuts the torsion spring along the final opening angle of the metal stop washer, and avoiding the existing fan-shaped avoidance gap on the tooling during cutting.

10. A method for processing a metal retaining washer according to any one of claims 1 to 9, characterized in that: After the torsion spring is cut by the wire cutting machine to form the stop washer, the cut metal stop washer is deblunted and deburred, and then cleaned.

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