Lidar arc surface window hardening tool

Abstract

The utility model provides a kind of laser radar cambered surface window hardening tool, including cambered surface window body, fixture body and clip. Cambered surface window body is connected with shunt and main flow passage in proper order, and it is equipped with cold material well below main flow passage, while fixture body is equipped with multiple clamping grooves compatible with cold material well. Cold material well is square column structure, and it is communicated with main flow passage, for guiding and storing cold material in injection molding process, cold material well can fix cambered surface window body when being loaded into the clamping groove on fixture body, with the effect of hardening handle. Fixture body is cuboid shape, shunt is U-shaped, when cold material well is loaded into the clamping groove on fixture body, clip clamps and fixes the water gap of main flow passage and fixture body. The utility model is evenly distributed on the surface of cambered surface window, and the thickness deviation of hardening layer is reduced from traditional ±5 μm to within ±2 μm, and the optical performance consistency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of laser radar optical component manufacturing technology, specifically relating to a laser radar curved window hardening tooling. Background Technology

[0002] LiDAR is a core sensor in fields such as autonomous driving and environmental perception. Its curved window, as a key optical component for laser signal transmission, must possess high light transmittance, impact resistance, and scratch resistance. The surface hardening treatment of the curved window directly affects the product's lifespan and optical performance. Current curved window hardening processes have significant technical defects in the design of the hardening material stalk and supporting fixtures, mainly in the following aspects: First, the hardened sprue is located above the sprue, resulting in an excessively large sprue volume. In traditional mold designs, the hardened sprue is typically positioned above the main runner for hoisting and securing during hardening. A perforated structure is also required on the sprue for threading steel wire, further contributing to its length. The main runner's cold sprue well is horizontally positioned to accommodate cold injection material. The existing separate structure of the hardened sprue and cold sprue well leads to significant raw material waste. Taking a certain type of LiDAR curved window as an example, the traditional hardened sprue and main runner cold sprue well have a volume of approximately 5 cm³, accounting for over 30% of the sprue volume, resulting in high raw material loss and increased production costs.

[0003] Secondly, the hardening process is cumbersome, and the fixture structure is complex. In the existing process, the hardening fixture must first be inverted, the product hardening material handle inserted downwards into the groove, then the steel wire threaded through the fixing hole, and finally the fixture flipped over and hung in the fixture frame. This process involves multiple flipping and steel wire fixing operations, with many steps (usually including 5 steps: fixture inversion → product hardening material handle insertion → steel wire threading → frame flipping → hanging posture correction). The product hardening process on a single frame (each fixture frame typically holds 8-10 products) takes up to 3 minutes to fix the products, resulting in low production efficiency. At the same time, the fixture needs to be adapted to the steel wire fixing structure, which is complex in design, has high processing costs, and the steel wire is prone to deformation and needs frequent replacement, further increasing maintenance costs.

[0004] Secondly, the product's poor fixation stability affects the curing and slurry application effect. Traditional fixtures fix the product at one or multiple points with steel wires, resulting in uneven distribution of fixing force. During the curing process (such as when dipping in the curing liquid or spraying the curing agent), the product is prone to loosening or shaking, leading to uneven distribution of the curing liquid on the curved viewing window surface, resulting in defects such as excessively thick or thin slurry layers, or localized missing layers. Test data shows that the thickness deviation of the cured layer under traditional processes can reach ±3μm, affecting the consistency of the product's optical performance.

[0005] The aforementioned problems have hindered the large-scale production of curved windows for lidar, and there is an urgent need to optimize the material handle design and fixture structure through structural innovation. Utility Model Content

[0006] To address the problems of excessively large material handle volume, significant material waste, cumbersome hardening process, complex fixtures, easy product loosening, and poor hardening fluid accumulation effect in existing LiDAR curved window hardening fixtures and processes, the purpose of this utility model is to provide a LiDAR curved window hardening fixture. By optimizing the position and shape of the hardening material handle and designing a compatible fixture slot and clamp fixing structure, the fixture aims to reduce the material handle volume, save materials, simplify the hardening process, improve product fixation stability, and enhance the hardening fluid accumulation effect.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A laser radar curved window hardening fixture includes a curved window body, a fixture body, and clamps. The curved window body is sequentially connected to a branch channel and a main channel. A cold slug well is provided directly below the main channel. The fixture body has multiple slots adapted to the cold slug well. The cold slug well has a square column structure and is connected to the main channel. It is used to guide and store cold material during the injection molding process. When the cold slug well is inserted into the slots on the fixture body, it can fix the curved window body and has the function of hardening the material handle.

[0008] Furthermore, the fixture body is rectangular in shape, the diversion channel is U-shaped, and when the cold material well is inserted into the slot on the fixture body, the clamp clamps and fix the main channel water inlet and the fixture body.

[0009] The cold material well has a length of 8-15mm, a width of 8-15mm, a height of 10-15mm, and a surface roughness Ra≤1.6μm on the inner wall of the cold material well.

[0010] The fitting clearance between the inner wall of the slot and the outer wall of the cold material well is 0.1-0.3mm, and the depth of the slot is 1 / 2-4 / 5 of the height of the cold material well.

[0011] The clamp is an elastic mechanical clamp, including a fixed base and a rotatable clamping arm. The end of the clamping arm is provided with an anti-slip rubber pad, and the clamping force range is 5-10N.

[0012] The cold material well and the main channel are integrally formed.

[0013] The fixture body is made of aluminum alloy and its surface is anodized.

[0014] The fixture body has 8 slots, which are evenly distributed on the fixture body.

[0015] The clamping arm of the elastic mechanical clamp has a rotation angle range of 0-90°.

[0016] Compared with the prior art, the beneficial effects of this utility model are: (1) Significantly reduce the volume of the sprue and save materials. The hardened material handle is moved from the top to the bottom and merged with the main channel cold material well. With the compact square column design, the volume of the hardened material handle and the main channel cold material well can be reduced from the traditional 5cm³ to less than 1cm³, and the volume of the sprue is reduced from 30% to less than 10%, which significantly reduces the cost of raw materials.

[0017] (2) Simplify the hardening process and speed up the hardening cycle. The product is directly inserted into the jig slot through the cold material well and fixed with the clamp. There is no need for the traditional process of inverting the jig, threading the steel wire, flipping the hanger, and correcting the hanging posture. The fixing process is reduced to 2 steps (inserting into the slot → clamp fixing). The hardening process fixing time of a single product is shortened to 1 minute, and the production efficiency is increased by 200%.

[0018] (3) Improve product fixation stability and enhance the curing liquid accumulation effect. The square column cold material well and the slot surface contact fit restrict horizontal swaying, and the auxiliary fixation of the clamp restricts vertical swaying, so that the product fixation force is evenly distributed and the clamping stability is significantly improved. The product does not loosen during the curing process, the curing liquid is evenly distributed on the curved viewing window surface, the thickness deviation of the curing layer is reduced from the traditional ±5μm to within ±2μm, and the consistency of optical performance is improved.

[0019] (4) Reduce the complexity and maintenance cost of the fixture. The fixture eliminates the steel wire fixing structure and adopts a combination design of slot and clamp. The structure is simple, the processing difficulty is reduced, and the manufacturing cost of the fixture is reduced by 40%. At the same time, the clamp is a mechanical elastic structure with no vulnerable parts, and the maintenance cycle is extended to more than 3 times that of traditional fixtures, thus reducing maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a traditional LiDAR curved window hardening fixture; Figure 2 This is a schematic diagram of the structure of a laser radar curved window hardening fixture according to the present invention; Figure 3 This is a schematic diagram of the structure of the curved window body described in this utility model; Figure 4 This is a schematic diagram of the structure of the fixture body described in this utility model. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of a traditional laser radar curved window hardening fixture. The hardening material handle 1 is located above the main channel 3, with a fixing hole structure 2, a horizontal cold material well 4, a diversion channel 5, and the curved window body 6 at the bottom.

[0023] See Figure 2-4 This utility model provides a laser radar curved window hardening fixture, including a curved window body 60, a fixture body 80, and a clamp 10. The curved window body 60 is connected in sequence to a branch channel 50 and a main channel 30. A cold slug well 70 is provided directly below the main channel 30. The fixture body 80 is provided with a plurality of slots 90 adapted to the cold slug well 70. The cold slug well 70 has a square column structure and is connected to the main channel 30. It is used to guide and store cold material during the injection molding process. When the cold slug well 70 is inserted into the slots 90 on the fixture body, it can fix the curved window body 60 and has the function of hardening the material handle.

[0024] contrast Figure 1 and Figure 2 This new design optimizes the structural design, with the cold slug well 70 located directly below the main channel 30 also serving as a hardening slug handle. This significantly reduces the overall volume of the main channel's sprue, while eliminating the perforated structure, thus shortening the length of the hardening slug handle. Essentially, it eliminates the hardening slug handle located above the main channel in traditional fixtures and moves the cold slug well, traditionally located horizontally above the main channel, directly below it.

[0025] like Figure 1 and Figure 4 As shown, the fixture body 80 is rectangular, the diversion channel 50 is U-shaped to bypass the fixture body, and when the cold material well 70 is inserted into the slot on the fixture body, the clamp 10 clamps and fixes the water inlet of the main channel and the fixture body.

[0026] The cold slug well 70 has a length of 8-15 mm, a width of 8-15 mm, and a height of 10-15 mm, and the surface roughness Ra of the inner wall of the cold slug well is ≤1.6 μm. This ensures smooth flow and storage of cold material, while providing a stable mechanical fit structure for subsequent fixture fixing.

[0027] The fitting clearance between the inner wall of the slot 90 and the outer wall of the cold sluice well is 0.1-0.3mm, and the depth of the slot is 1 / 2-4 / 5 of the height of the cold sluice well. This ensures that the curved window body can be directly inserted into the slot through the cold sluice well, limiting horizontal swaying and achieving initial positioning.

[0028] The clamp 10 is an elastic mechanical clamp, including a fixed base and a rotatable clamping arm. The end of the clamping arm is provided with an anti-slip rubber pad, and the clamping force range is 5-10N. This clamp can be fixed on a fixture or used as a movable part to assist in fixing the sprue, preventing the product from shaking vertically during the hardening process and improving the stability of the fixation.

[0029] The cold material well and the main channel are integrally formed.

[0030] The fixture body 80 is made of aluminum alloy and its surface is anodized.

[0031] The fixture body 80 has 8 slots, which are evenly distributed on the fixture body.

[0032] The clamping arm of the elastic mechanical clamp has a rotation angle range of 0-90°.

[0033] Example 1: Hardened material handle structure for curved window of a certain type of lidar Curved window parameters: length 150mm, curvature R200mm, thickness 3mm, material is polycarbonate (PC).

[0034] Hardened material handle structure: The hardened material handle (square column cold slug well) is located directly below the main channel. The specific dimensions of the square column cold slug well are: length 8mm, width 8mm, height 10mm, inner wall surface roughness Ra=1.2μm. The branch channel connects to the main channel, the branch channel diameter is 8mm, and the arc-shaped viewing window body is located below the branch channel.

[0035] Fixture body: Made of aluminum alloy with anodized surface, measuring 300mm×50mm×10mm.

[0036] Slot structure: It is formed on the jig body, with a quantity of 8 slots. The slot dimensions are: length 8.2mm, width 8.2mm, and depth 8mm (4 / 5 of the height of the cold slug well). The inner wall of the slot and the outer wall of the cold slug well have a clearance of 0.2mm to ensure that the cold slug well can be smoothly inserted without shaking.

[0037] Clip structure: Each slot is equipped with a flexible mechanical clip with a clamping arm length of 30mm, a rotation angle of 0-90°, a 2mm thick anti-slip rubber pad at the end, and a clamping force of 8N (adjustable by spring force).

[0038] Based on the above tooling, the injection molding and hardening process flow is as follows: (1) Injection molding of curved window and sprue: an injection molding machine is used with a melt temperature of 290℃, a mold temperature of 110℃, an injection pressure of 80MPa, and a holding pressure of 50MPa. After injection molding, the finished product is taken out of the mold.

[0039] (2) Fixture clamping: Align the product’s square column cold material well with the fixture slot and insert it vertically downwards. The slot depth is 8mm and the cold material well is exposed 2mm. Rotate the clamping arm of the clamp to clamp the sprue to the fixture and confirm that the clamping is firm (no axial or radial shaking).

[0040] (3) Hardening treatment: Place the clamped fixture directly into the hardening line without flipping it. Hardening process parameters: solid content of hardening liquid 15%, curing temperature 115℃, treatment time 180 minutes.

[0041] (4) Removal: After hardening, loosen the clamp, remove the product from the slot, cut off the sprue, and obtain the finished product of the hardened curved window.

Claims

1. A hardening fixture for a curved viewing window of a lidar system, characterized in that, The device includes a curved window body, a fixture body, and clamps. The curved window body is connected in sequence to a branch channel and a main channel. A cold slug well is provided directly below the main channel. The fixture body has multiple slots that are adapted to the cold slug well. The cold slug well has a square column structure and is connected to the main channel. It is used to guide and store cold material during the injection molding process. When the cold slug well is inserted into the slots on the fixture body, it can fix the curved window body and has the function of hardening the material handle.

2. The laser radar curved window hardening fixture according to claim 1, characterized in that, The fixture body is rectangular, the diversion channel is U-shaped, and when the cold material well is inserted into the slot on the fixture body, the clamp clamps and fixes the main channel water inlet and the fixture body.

3. The laser radar curved window hardening fixture according to claim 1, characterized in that, The cold material well has a length of 8-15mm, a width of 8-15mm, a height of 10-15mm, and a surface roughness Ra≤1.6μm on the inner wall of the cold material well.

4. The laser radar curved window hardening fixture according to claim 1, characterized in that, The fitting clearance between the inner wall of the slot and the outer wall of the cold material well is 0.1-0.3mm, and the depth of the slot is 1 / 2-4 / 5 of the height of the cold material well.

5. The laser radar curved window hardening fixture according to claim 1, characterized in that, The clamp is an elastic mechanical clamp, including a fixed base and a rotatable clamping arm. The end of the clamping arm is provided with an anti-slip rubber pad, and the clamping force range is 5-10N.

6. The laser radar curved window hardening fixture according to claim 1, characterized in that, The cold material well and the main channel are integrally formed.

7. The laser radar curved window hardening fixture according to claim 1, characterized in that, The fixture body is made of aluminum alloy and its surface is anodized.

8. The laser radar curved window hardening fixture according to claim 2, characterized in that, The fixture body has 8 slots, which are evenly distributed on the fixture body.

9. The laser radar curved window hardening fixture according to claim 5, characterized in that, The clamping arm of the elastic mechanical clamp has a rotation angle range of 0-90°.

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