A precision shaping process for involute gear parts

Abstract

This invention discloses a precision shaping process for involute gear parts, comprising the following steps: placing the parts to be processed sequentially and intermittently on a strip of material, and processing the parts on the strip of material using a continuous die; punching guide holes in the strip of material with the parts to be processed; rough punching the parts to be processed to create positioning side edges and small holes; shaping the small holes of the parts after arranging two empty steps; shaping the positioning holes of the parts; performing semi-finish blanking on the tooth profile of the parts; and finishing the tooth profile of the parts and blanking. This precision shaping process for involute gear parts addresses the characteristics of small part size and small involute tooth width, resulting in a small amount of tooth profile shaping. By using a single continuous die, the parts are processed to achieve high-precision tooth profile dimensions and high-precision tooth profile surface roughness.

Description

Technical Field

[0001] This invention relates to the field of precision forming of stamping dies, and more particularly to a precision shaping process for incomplete involute gear parts. Background Technology

[0002] Involute gear plates are generally manufactured by stamping blanks and then milling the teeth with a gear milling machine. This process has low production efficiency, high cost, and requires a dedicated gear milling machine.

[0003] Progressive dies are a type of efficient, high-quality, and long-life practical mold suitable for mass production of stamped parts and widely used in manufacturing. Progressive die production technology is an important indicator of the level of stamping technology. A single progressive die can complete multiple stamping processes such as blanking, bending, forming, and deep drawing. It can break down complex parts shapes or holes into simpler stamping processes.

[0004] Because multiple steps are arranged in one mold, the mold structure is relatively complex and the manufacturing precision is very high, which also requires a high level of technical skills from mold designers and maintenance personnel. Summary of the Invention

[0005] The purpose of this invention is to provide a precision machining process for involute gear parts that can achieve high precision in tooth profile dimensions and tooth surface roughness for incomplete gear parts.

[0006] To achieve the above objectives, the specific technical solution of the precision shaping process for involute gear parts according to the present invention is as follows:

[0007] A precision shaping process for involute gear parts includes the following steps:

[0008] Step 1: Place the parts to be processed on the strip in sequence with gaps, and process the parts on the strip through a continuous die;

[0009] Step 2: Punch guide holes in the strip of material with the parts to be processed fixed on it;

[0010] Step 3: Rough punching the part to position the side cutting edge and small hole;

[0011] Step 4: After setting up two empty steps, refine the shape of the small holes in the part;

[0012] Step 5: Modify the positioning holes of the part;

[0013] Step six: Perform semi-finish blanking on the tooth profile of the part;

[0014] Step 7: Refine the tooth profile of the part and cut it out.

[0015] Furthermore, the width of the strip is 17mm to 21mm, and the spacing between adjacent parts is 8mm to 12mm.

[0016] Furthermore, the progressive die has a length of 550–650 mm, a width of 280–360 mm, and a height of 300–330 mm.

[0017] Furthermore, in step two, the two guide holes on both sides of the starting end of the strip are punched to position the strip during subsequent punching processes.

[0018] Furthermore, in step three, after the part on the strip moves forward with the progressive die, the positioning side-cutting punch and the small hole punch of the part to be processed on the strip move downward simultaneously to punch the positioning side-cutting punch and punch the small hole to form a small hole of φ0.6~0.8mm.

[0019] Furthermore, in step four, after two empty steps, the toothed punch of the part to be processed on the strip moves downward and then performs rough punching of the toothed part, which removes part of the material from the toothed part of the strip to form the toothed part after rough punching.

[0020] Furthermore, in step five, the shaping punch for the positioning holes of the parts to be processed on the strip moves downward to punch and shape the part material on the surfaces of the two positioning holes.

[0021] Furthermore, in step six, the toothed semi-finishing punch of the part to be processed on the strip moves downward to punch away a layer of material from the toothed surface.

[0022] Furthermore, in step seven, the finishing punch of the part to be processed on the strip moves downward to punch away a layer of material on the surfaces of the two small holes and the tooth shape, thus completing the finishing of the small holes and the tooth shape; the blanking punch of the part to be processed on the strip moves downward to separate the part from the strip, thus completing the blanking.

[0023] Furthermore, it also includes step eight, which involves feeding strips and parts from the progressive die, and manually deburring, cleaning, and inspecting the parts.

[0024] The advantages of the precision profile modification process for involute gear parts of the present invention are as follows: taking into account the small size of the parts and the small tooth width of the involute tooth profile, which results in a small amount of tooth profile modification, the parts are processed by a set of continuous dies to achieve high precision tooth profile dimensions and high precision tooth profile surface roughness. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the involute gear plate part of the present invention;

[0026] Figure 2 This is a strip layout diagram of the involute gear plate part of the present invention. Detailed Implementation

[0027] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides a precision shaping process for an involute gear disc part according to this invention.

[0028] like Figures 1 to 2 As shown, this invention provides a precision shaping process for involute gear parts. It involves stamping incomplete gear parts and machining them using a progressive die to achieve high-precision tooth dimensions and surface roughness. The process includes the following steps:

[0029] Step one: Place the parts to be processed sequentially and intermittently on the strip material. The width of the strip material is 17mm to 21mm, preferably 19mm, and the spacing between adjacent parts is the same, with a step distance of 8mm to 12mm, preferably 10mm. Process the parts on the strip material using a progressive die.

[0030] Specifically, the progressive die has a length of 550-650mm, preferably 600mm, a width of 280-360mm, preferably 320mm, and a height of 300-330mm, preferably 315mm.

[0031] Step two: punch guide holes in the strip of material with the parts to be processed fixed on it.

[0032] Specifically, the two guide holes on both sides of the starting end of the strip are punched to position the strip during subsequent punching processes.

[0033] Step 3: Roughly punch the part to position the side cutting edge and small hole.

[0034] Specifically, after the part on the strip moves forward with the progressive die, the positioning side-cutting punch and the small-hole punch of the part to be processed on the strip move downward simultaneously to punch out the positioning side-cutting edge (1.2×2×10mm) and punch the small hole to form φ0.6~0.8mm (preferred). The small hole is left with a 0.1mm allowance for fine finishing, which will be carried out later.

[0035] Step four: After setting up two empty steps, reshape the small holes of the part.

[0036] Specifically, to meet the strength requirements of the mold, two empty steps are arranged after the rough punching of the small hole, without punching the part. After the two empty steps, the toothed punch of the part to be processed on the strip moves downward, and then the toothed part is rough punched (also known as toothed scrap) to punch away part of the toothed part on the strip, forming the toothed part after rough punching.

[0037] Step 5: Modify the positioning holes of the part.

[0038] Specifically, to ensure accurate positioning of the parts in the mold, the shaping punch of the positioning hole of the part to be processed on the strip moves downward to punch and shape the part material on the surface of the two positioning holes, so as to obtain positioning holes with precise dimensions and high surface quality.

[0039] Step six: Perform semi-finish blanking on the part.

[0040] Specifically, because the tooth shape is precise, the required tooth shape cannot be obtained in one punching. Therefore, a semi-finishing punch is required. The semi-finishing punch of the tooth shape of the part to be processed on the strip moves downward to punch off a layer of material on the tooth surface. After this step, there is still a layer of material on the tooth surface that needs to be further refined.

[0041] Step 7: Refine the tooth profile of the part and cut it out.

[0042] Specifically, the finishing punch of the part to be processed on the strip moves downward to punch away a layer of material on the surfaces of the two small holes and the tooth shape, thus completing the finishing of the small holes and the tooth shape. Through the finishing guide hole, it is ensured that each shaping step can be accurately positioned.

[0043] Then, the finished part is 10mm away from the blanking edge, that is, the step distance of the strip moving forward is 10mm. The blanking punch of the part to be processed on the strip moves downward to separate the part from the strip and complete the blanking.

[0044] Step 8: Unload strips and parts from the progressive die, and manually deburr, clean, and inspect the parts.

[0045] Specifically, after the parts are precision shaped, the burrs around the parts caused by the shaping are removed by hand using sandpaper. Then, the dust on the surface of the parts is cleaned in a hydrocarbon solution. Finally, the inspectors check the size and appearance of the parts. Parts that pass the inspection are transferred to the assembly line.

[0046] Considering that the part processed by this invention is an incomplete gear piece, the incomplete part can serve as a bridge to connect with the strip material, so that the part is always connected to the strip material during the roughing, finishing and other processing steps, and moves forward with the strip material. This condition is a necessary condition for the part to be processed by progressive die.

[0047] The advantages of the precision profile modification process for involute gear parts of the present invention are as follows: taking into account the small size of the parts and the small tooth width of the involute tooth profile, which results in a small amount of tooth profile modification, the parts are processed by a set of continuous dies to achieve high precision tooth profile dimensions and high precision tooth profile surface roughness.

[0048] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A precision shaping process for incomplete involute gear parts, characterized in that, The steps are as follows: Step 1: Place the parts to be processed on the strip in sequence with gaps, and process the parts on the strip through a continuous die; Step 2: Punch guide holes in the strip material with the parts fixed on it; Step 3: Rough punching the part to position the side cutting edge and small hole; Step 4: After setting up two empty steps, refine the shape of the small holes in the part; Step 5: Modify the positioning holes of the part; Step six: Perform semi-finish blanking on the part to create a toothed profile; Step 7: Refine the tooth profile of the part and cut it out.

2. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, The width of the strip is 17mm~21mm, and the spacing between adjacent parts is 8mm~12mm.

3. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, The progressive die has a length of 550~650mm, a width of 280~360mm, and a height of 300mm~330mm.

4. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, In step two, the two guide holes on both sides of the starting end of the strip are punched to position the strip during the subsequent punching process.

5. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, In step three, after the part on the strip moves forward with the progressive die, the positioning side-cutting punch and the small hole punch of the part on the strip move downward at the same time to punch the positioning side-cutting punch and punch the small hole to form a small hole of φ0.6~0.8mm.

6. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, In step four, after two empty steps, the toothed punch of the part on the strip moves downward and then performs rough punching to remove part of the material from the toothed part of the strip, forming the rough punched tooth.

7. The precision shaping process for incomplete involute gear parts according to claim 1, characterized in that, In step five, the shaping punch for the positioning holes of the parts on the strip moves downward to punch and shape the part material on the surfaces of the two positioning holes.

8. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, In step six, the toothed semi-finishing punch of the part on the strip moves downward to punch away a layer of material from the toothed surface.

9. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, In step seven, the finishing punch of the part on the strip moves downward to punch away a layer of material from the surfaces of the two small holes and the toothed surface, completing the finishing of the small holes and the toothed surface; the blanking punch of the part on the strip moves downward to separate the part from the strip, completing the blanking.

10. The precision shaping and machining process for incomplete involute gear parts according to claim 1, characterized in that, It also includes step eight, which involves feeding strips and parts from the progressive die and manually deburring, cleaning, and inspecting the parts.

Images