Free-form surface mirror fine carving jig

Abstract

The utility model discloses a free-form surface mirror fine carving jig which is characterized in that a profiling jig which is similar to a free-form surface mirror in shape is arranged on a base, a cavity is formed between the profiling jig and the base, and an air exhaust groove which is communicated with the cavity is formed in the profiling jig; an air exhaust hole communicated with the cavity is formed in the base, and the vacuum adsorption device is connected with the air exhaust hole; one end of a dust collection hole formed in the dust collection block is communicated with the cavity, and the other end of the dust collection hole is connected with a dust collector. According to the utility model, processing chippings are splashed down to a non-appearance surface and are collected by the dust collector through the dust collection block, so that the chippings are prevented from scratching a product, the product can be firmly positioned in a balanced stress manner, the optical surface type is not influenced, the product can be quickly mounted and dismounted, and a processing notch can be neat, smooth and attractive.

Description

TECHNICAL FIELD

[0001] The utility model relates to a jig, in particular to a free-form surface mirror fine carving jig. BACKGROUND

[0002] HUD (Head Up Display) is a kind of projection display optical device, can be projected to the car front windshield glass, driver does not need to bow to check various information, it is favorable to traffic safety.In addition, the current popular AR-HUD can also be coupled on the bifurcated road in front of steering arrow simulation, and the front building, road sign is coupled and is marked, greatly improves the experience of vehicle navigation.HUD the most core optical parts is free-form surface mirror, free-form surface mirror is generally manufactured by injection molding way.Because free-form surface mirror product is thick and wide, when injection molding, it also needs to be matched with thick and wide water gap, after injection molding, the water gap is cut off using fine carving machine.

[0003] The existing free-form surface mirror water gap cutting method has the following disadvantages:

[0004] 1. Chips have no fixed direction or fly upward and easily scratch the product;

[0005] 2. The fixing method is unreasonable, and affects the product optical surface type;

[0006] 3. The fixing method is too complicated, and affects the processing efficiency;

[0007] 4. The processing cut is too rough, and the appearance and precision cannot meet the requirements. SUMMARY

[0008] The utility model wants to solve the technical problem to provide a kind of free-form surface mirror fine carving jig, utilize the jig can make processing chip to the non-appearance face splash (fixed to fly out downward), and be collected by dust collector through dust absorption block, can be positioned firmly and balanced to product, and do not affect optical surface type, can quickly install and remove product, reduce the time of loading and unloading more than 10 seconds, can make processing cut neat and smooth, and water gap residual amount is less than 0.1mm.

[0009] To solve the above technical problems, the technical scheme adopted by the utility model is: a kind of free-form surface mirror fine carving jig, including base, on the base, it is set with the free-form surface mirror similar shape's profiling jig, and the profiling jig is formed with cavity between base, profiling jig is provided with the air extraction groove that is permeable with cavity;Vacuum suction device is connected with the air extraction hole that is communicated with cavity on the base;Suction block is arranged on the base, and the dust suction hole in the suction block is communicated with the cavity at one end, and the other end is connected with dust collector.

[0010] A movable push block is provided on one side of the base, and a positioning block is provided on the other side of the base. The freeform mirror placed on the contour jig is fixed by the push block and the positioning block.

[0011] The push block has a through hole in the middle, and a spring is installed in the through hole. A horizontal long screw passes through the spring and through the push block to fix the push block to the boss of the base. Adjusting the length of the horizontal long screw can control the compression of the spring, and thus control the clamping force of the push block.

[0012] A sealing ring is provided around the upper surface of the contour jig, which can seal and enclose the freeform mirror placed on the contour jig.

[0013] The vacuum adsorption device includes a vacuum generator and a sliding valve, and the vacuum generator and the sliding valve are connected by corresponding air pipes, as are the vacuum generator and the air extraction port.

[0014] A sprue material receiving area is also provided above the dust collection block.

[0015] The precision carving process steps of this utility model are as follows:

[0016] 1. Pull out the push block and place the freeform mirror product onto the contour jig;

[0017] 2. Release the push block, and the freeform mirror product will be positioned close to the positioning block;

[0018] 3. By pushing the sliding valve to activate the vacuum generator, the freeform mirror product is firmly adhered to the contour jig;

[0019] 4. Turn on the vacuum cleaner, then start the fine carving program. Use the left-hand rotary cutter to cut the sprue. The debris will be discharged downwards into the vacuum cleaner. After the sprue is cut off, start the second fine carving cut until the cut is finished.

[0020] 5. Push the sliding valve in the opposite direction to turn off the vacuum generator. The suction force will disappear. Pull the push block to remove the freeform mirror product.

[0021] This utility model uses a left-hand milling cutter, which is used in conjunction with a high-speed, low-feed-speed CNC engraving machine. The CNC engraving machine speed is about 30,000-35,000 rpm, and the feed speed is 80-120 mm / min. The first cut is a rough cut to cut off the sprue, leaving a sprue residue of about 0.3-0.4 mm. The second cut is a finishing cut to trim and polish the cut, leaving a sprue residue of less than 0.1 mm.

[0022] The freeform mirror precision carving fixture designed using the above-mentioned technical solution has the following beneficial effects:

[0023] 1. By using a left-hand rotary blade to discharge chips downwards and setting a dust collection block to cover the chip discharge area, most of the chips are discharged downwards and sucked away by the vacuum cleaner, preventing chips from scratching the product;

[0024] 2. By using vacuum uniform adsorption to ensure that all areas of the product are subjected to uniform force, it is possible to avoid affecting the product's optical surface shape;

[0025] 3. By using a sliding valve to control the operation of the vacuum generator, products can be easily adsorbed / released, resulting in high processing efficiency and saving clamping time of more than 10 seconds (from more than 15 seconds to less than 5 seconds).

[0026] 4. By using a special precision carving process: left-hand milling cutter, high speed, low feed rate, two-cutting method, the first cut cuts off the sprue, and the second cut refines the cut, the residual amount of sprue can be controlled to be less than 0.1mm, resulting in high machining accuracy and smooth and beautiful cut. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the combined structure of the precision carving fixture of this utility model;

[0028] Figure 2 A schematic diagram showing the main structure of the precision carving fixture of this utility model;

[0029] Figure 3 This is a schematic diagram showing the structure of the base, integrated block, and push block of this utility model;

[0030] Figure 4 This is a schematic diagram showing the structure of the curved mirror of this utility model adsorbed on the precision carving fixture;

[0031] Figure 5 This diagram shows the structure of the vacuum generator of this invention.

[0032] Figure 6 This diagram shows the structure of the sliding valve of this utility model.

[0033] Figure 7 This is a schematic diagram showing the structure of the left-hand milling cutter of this utility model;

[0034] Figure 8 This is a rear view of the precision carving fixture of this utility model.

[0035] In the diagram: 1. Contouring fixture, 1-1. Positioning block, 1-2. Sealing ring, 1-3. Suction groove, 1-4. Suction hole, 2. Base, 3. Dust suction block, 3-1. Suction hole, 4. Push block, 5. Vacuum generator, 6. Sliding valve, 7. Air pipe. Detailed Implementation

[0036] The following description, in conjunction with the accompanying drawings, details a precision carving fixture for a freeform surface mirror according to this utility model.

[0037] This utility model relates to a precision carving fixture for free-form mirrors. (See also...) Figures 1 to 8The device includes a base 2, on which a conforming fixture 1, similar in shape to a freeform mirror, is mounted. The surface shape of the conforming fixture 1 is similar to the bottom shape of the freeform mirror product, allowing the freeform mirror product to fit well when placed in the conforming fixture 1. A cavity is formed between the conforming fixture 1 and the base 2. The conforming fixture 1 has suction grooves 1-3 that are permeable to the cavity. The suction grooves 1-3 are symmetrically arranged vertically and horizontally, ensuring balanced suction on all areas of the freeform mirror product during suction. Suction holes 1-4, communicating with the cavity, are provided on the base 2, and the vacuum adsorption device is connected to the suction holes 1-4. The vacuum adsorption device of this invention includes a vacuum generator 5 and a sliding valve 6. The vacuum generator 5 and the sliding valve 6, as well as the vacuum generator 5 and the suction holes 1-4, are connected by corresponding air pipes 7. The vacuum generator 5 is driven by compressed air and can generate a vacuum pressure of -0.6 to -0.9 kPa. The suction action of the vacuum generator 5 is controlled by the sliding valve 6. A dust-collecting block 3 is installed on the base 2. One end of the dust-collecting hole 3-1 inside the dust-collecting block 3 is connected to the cavity, and the other end is connected to a vacuum cleaner through a dust-collecting pipe. The diameter of the dust-collecting hole 3-1 is 20-30mm, and the front end of the dust-collecting hole 3-1 is made into a conical surface. A sprue material receiving area is provided above the dust-collecting block 3, with a 1-2mm gap reserved to prevent the sprue from being stressed.

[0038] A movable push block 4 is provided on one side of the base 2, and a positioning block 1-1 is provided on the other side of the base 2. A through hole is provided in the middle of the push block 4, and a spring is provided in the through hole. A horizontal long screw passes through the spring and through the through hole to fix the push block 4 to the boss of the base 2. One end of the spring rests on the cap of the horizontal long screw, and the other end of the spring rests on the boss. By adjusting the length of the horizontal long screw, the compression of the spring can be controlled, thereby controlling the clamping force of the push block 4. The spring force adjustment range is 0-2kg. The freeform mirror placed on the contour jig 1 is fixed by the push block 4 and the positioning block 1-1. Manually pull open the push block 4, place the freeform mirror product on the contour jig 1, and then release it. The push block 4 will push the freeform mirror product forward with a pushing force of 0-2kg, so that the edge of the freeform mirror product is close to the positioning block 1-1. Pushing the sliding valve 6 activates the vacuum generator 5, which generates a negative pressure of -0.6 to -0.9 kPa, causing the freeform mirror product to be uniformly adsorbed onto the contour jig 1.

[0039] A sealing ring 1-2 is provided around the upper surface of the profiling fixture 1. The sealing ring 1-2 is made of silicone foam strip, with a diameter of 2mm and protruding 0.5-0.8mm above the surface of the profiling fixture 1. The sealing ring 1-2 can seal and enclose the freeform mirror placed on the profiling fixture 1.

[0040] This utility model uses a left-hand milling cutter to cut the sprue (traditional right-hand milling cutters discharge chips upwards, while left-hand milling cutters discharge chips downwards). Its precision engraving process steps are as follows:

[0041] 1. Pull out push block 4 and place the freeform mirror product onto the contour jig 1;

[0042] 2. Release push block 4, and the freeform mirror product will be close to positioning block 1-1;

[0043] 3. Pushing the sliding valve 6 and vacuum generator 5 to work, the freeform mirror product is tightly adsorbed onto the contour jig 1;

[0044] 4. Turn on the vacuum cleaner and use the left-hand rotary cutter to cut the sprue. The debris will be discharged downwards into the vacuum cleaner. After the sprue is cut off, begin the second fine-tuning cut. The fine-tuning of the cut is now complete.

[0045] 5. Push the sliding valve 6 in the opposite direction to turn off the vacuum generator 5, pull open the push block 4, and take out the freeform mirror product.

[0046] This utility model uses a left-hand milling cutter, which is used in conjunction with a high-speed, low-feed-speed CNC engraving machine. The CNC engraving machine speed is about 30,000-35,000 rpm, and the feed speed is 80-120 mm / min. The first cut is a rough cut to cut off the sprue, leaving a sprue residue of about 0.3-0.4 mm. The second cut is a finishing cut to trim and polish the cut, leaving a sprue residue of less than 0.1 mm.

Claims

1. A precision carving fixture for a freeform mirror, comprising a base, characterized in that... A contour jig similar in shape to a freeform mirror is provided on the base, and a cavity is formed between the contour jig and the base. An air extraction groove that is transparent to the cavity is provided on the contour jig. An air extraction hole communicating with the cavity is provided on the base, and a vacuum adsorption device is connected to the air extraction hole. A dust collection block is provided on the base, and a dust collection hole inside the dust collection block is connected to the cavity at one end and to a vacuum cleaner at the other end.

2. The freeform mirror precision carving fixture according to claim 1, characterized in that: A movable push block is provided on one side of the base, and a positioning block is provided on the other side of the base. The freeform mirror placed on the contour jig is fixed by the push block and the positioning block.

3. The freeform mirror precision carving fixture according to claim 2, characterized in that: The push block has a through hole in the middle, and a spring is installed in the through hole. A horizontal long screw passes through the spring and through the push block to fix the push block to the boss of the base. Adjusting the length of the horizontal long screw can control the compression of the spring, and thus control the clamping force of the push block.

4. The freeform mirror precision carving fixture according to claim 1, characterized in that: A sealing ring is provided around the upper surface of the contour jig, which can seal and enclose the freeform mirror placed on the contour jig.

5. A freeform mirror precision carving fixture according to claim 1, characterized in that... The vacuum adsorption device includes a vacuum generator and a sliding valve, and the vacuum generator and the sliding valve are connected by corresponding air pipes, as are the vacuum generator and the air extraction port.

6. The freeform mirror precision carving fixture according to claim 1, characterized in that: A sprue material receiving area is also provided above the dust collection block.

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