High-precision extrusion die for automobile lane keeping

Abstract

The utility model discloses a high accuracy extrusion die special use in car harness, it relates to car harness processing technical field. Including die body, the die body adopts YG8 tungsten steel material integrated forming, the die body include the big outside circle and small outside circle that link to each other gradually, and the inside of die body is provided with mould hole, the big outside circle is provided with annular positioning groove at the junction with small outside circle, the mould hole includes 60 degree taper area and 14 degree taper area and sizing area that set up gradually along the extrusion direction. The utility model can realize the double promotion of harness processing quality and die life.

Description

Technical Field

[0001] This utility model relates to the field of automotive wiring harness processing technology, specifically to a high-precision extrusion die for automotive wiring harnesses. Background Technology

[0002] As a core component of automotive electrical systems, the precision, wear resistance, and surface quality of the insulation layer extrusion molding process directly affect the electrical performance and service life of automotive wiring harnesses. Existing extrusion dies mostly use ordinary steel or low-grade cemented carbide, which presents the following problems:

[0003] Insufficient wear resistance: After long-term use, the mold holes are prone to wear, resulting in a decrease in the dimensional accuracy of the wire harness and frequent mold replacement;

[0004] Poor pressure and flow control: Traditional mold taper design is simple and difficult to match the flow of different plastic materials, which can easily lead to defects such as uneven wire harness wrapping force and rough surface.

[0005] Low installation and positioning accuracy: The matching error between the mold and the distributor is large, and vibration is easily generated during operation, which affects the consistency of finished products.

[0006] Therefore, there is an urgent need for an automotive wiring harness extrusion die that combines high wear resistance, high-precision flow control, and convenient installation and positioning. Utility Model Content

[0007] In view of the shortcomings of existing technologies, such as poor wear resistance, low dimensional accuracy and insufficient flow control, the purpose of this utility model is to provide a high-precision extrusion die for automotive wiring harnesses, thereby improving the processing quality of wiring harnesses and extending the service life of the die.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-precision extrusion die for automotive wiring harnesses, comprising a die body, wherein the die body is integrally formed from YG8 tungsten steel material, the die body comprises a large outer circle and a small outer circle connected in sequence, the die body is provided with a die hole inside, and an annular positioning groove is provided at the connection between the large outer circle and the small outer circle, the die hole includes a 60° taper area, a 14° taper area and a sizing area arranged in sequence along the extrusion direction.

[0009] Preferably, the mold body is made of YG8 tungsten steel.

[0010] Preferably, the width of the annular positioning groove is 5-8 mm and the depth is 2-3 mm.

[0011] Preferably, the dimensional tolerance of the sizing region is ≤ ±0.01 mm, and the surface roughness Ra is ≤ 0.025 μm.

[0012] Preferably, the clearance between the large outer circle and the inner hole of the extruder distributor is ≤0.003mm.

[0013] Preferably, the mold body is connected to the quick-change fixture via an annular positioning groove, and the installation repeatability positioning accuracy is ≤0.002mm.

[0014] The beneficial effects of this utility model are:

[0015] 1. The mold body is integrally formed from YG8 tungsten steel material, with a hardness ≥89HRA, bending strength ≥1500MPa, and die hole sizing zone dimensional tolerance ≤±0.01mm and surface roughness Ra≤0.025μm, ensuring stable dimensional accuracy of the wire harness after extrusion and a mirror-level surface finish (Ra≤0.1μm). At the same time, the wear resistance life of the mold is 5 to 8 times that of traditional steel molds, reducing the cost of frequent mold replacement.

[0016] 2. The fit clearance between the large outer circle and the inner hole of the extruder distributor is ≤0.003mm, eliminating radial vibration during operation; the width of the annular positioning groove is 5-8mm and the groove depth is 2-3mm, which enables the mold to be quickly positioned axially through quick-change fixtures. The installation repeatability positioning accuracy is ≤0.002mm, and the mold change time is shortened to 1 / 6 of that of traditional molds, improving production efficiency.

[0017] 3. The die holes are sequentially set with a 60° taper zone, a 14° taper zone, and a sizing zone. The 60° taper zone quickly gathers the melt to establish initial pressure, while the 14° taper zone gently releases pressure and stabilizes the flow field, ensuring that the fluctuation of the plastic melt's wrapping force on the wire is ≤5%, thus solving the wire harness quality defects caused by "over-wrapping" or "under-wrapping" in traditional molds. Attached Figure Description

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0019] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] Reference Figure 1The specific embodiment adopts the following technical solution: a high-precision extrusion die for automotive wiring harnesses, including a die body 1. The die body 1 is integrally formed from YG8 tungsten steel material. The die body 1 includes a large outer circle 2 and a small outer circle 3 connected in sequence. A die hole 4 is provided inside the die body. An annular positioning groove 5 is provided at the connection between the large outer circle 2 and the small outer circle 3. The die hole 4 includes a 60° taper area 41, a 14° taper area 42, and a sizing area 43 arranged in sequence along the extrusion direction.

[0022] It is worth noting that the mold body 1 is made of YG8 tungsten steel.

[0023] It is worth noting that the width of the annular positioning groove 5 is 5-8 mm and the depth is 2-3 mm.

[0024] It is worth noting that the dimensional tolerance of the sizing region 43 is ≤ ±0.01 mm and the surface roughness Ra is ≤ 0.025 μm.

[0025] It is worth noting that the fitting clearance between the large outer circle 2 and the inner hole of the extruder distributor is ≤0.003mm.

[0026] In addition, the mold body 1 is connected to the quick-change fixture through the annular positioning groove 5, and the installation repeatability positioning accuracy is ≤0.002mm.

[0027] In this specific embodiment, the mold body 1 is integrally formed using YG8 tungsten steel powder (92% tungsten content, 8% cobalt content) through a low-pressure sintering process, with a sintering pressure of 100 kgf / cm². 2 The sintering temperature was 1450℃, and the holding time was 2 hours to ensure that the material density was ≥99.9%, the hardness reached 89.5HRA, the flexural strength was 1600MPa, and the impact toughness was 2.8J / cm. 2 It meets the requirements for wear resistance and impact resistance under high-pressure extrusion conditions.

[0028] The workflow of this specific embodiment is as follows: The large outer circle 2 of the mold body 1 is inserted into the inner hole of the extruder distributor, and is clamped and fixed with the quick-change fixture through the annular positioning groove 5 to ensure that the installation coaxiality is ≤0.003mm; the plastic melt is converged and compressed in the 60° taper zone 41 (pressure rises to 18MPa), and after entering the 14° taper zone 42, the pressure gradually drops to 8MPa. Finally, it is shaped by the sizing zone 43. The extruded wire harness has a smooth surface without scratches, and the actual diameter deviation is ≤±0.005mm; the mold can be removed by loosening the quick-change fixture. The time to replace the new mold is ≤5 minutes, which saves 80% of the time compared with the traditional bolt fixing method.

[0029] This implementation method is applicable to the extrusion processing of insulation layers for automotive low-voltage wiring harnesses (such as signal lines) and new energy vehicle high-voltage wiring harnesses (temperature resistance above 150℃), and is especially suitable for the high precision and high efficiency requirements in large-scale production scenarios.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-precision extrusion die for automotive wiring harnesses, characterized in that: The mold body (1) is integrally formed from YG8 tungsten steel. The mold body (1) includes a large outer circle (2) and a small outer circle (3) connected in sequence. The mold body has a mold hole (4) inside. An annular positioning groove (5) is provided at the connection between the large outer circle (2) and the small outer circle (3). The mold hole (4) includes a 60° taper area (41), a 14° taper area (42), and a sizing area (43) arranged in sequence along the extrusion direction.

2. The high-precision extrusion die for automotive wiring harnesses according to claim 1, characterized in that, The mold body (1) is made of YG8 tungsten steel.

3. The high-precision extrusion die for automotive wiring harnesses according to claim 1, characterized in that, The width of the annular positioning groove (5) is 5-8 mm and the depth is 2-3 mm.

4. The high-precision extrusion die for automotive wiring harnesses according to claim 1, characterized in that, The dimensional tolerance of the sizing region (43) is ≤ ±0.01 mm, and the surface roughness Ra is ≤ 0.025 μm.

5. The high-precision extrusion die for automotive wiring harnesses according to claim 1, characterized in that, The clearance between the large outer circle (2) and the inner hole of the extruder distributor is ≤0.003mm.

6. The high-precision extrusion die for automotive wiring harnesses according to claim 1, characterized in that, The mold body (1) is connected to the quick-change fixture through the annular positioning groove (5), and the installation repeatability positioning accuracy is ≤0.002mm.

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