A high-precision positioning mechanism

Abstract

The utility model discloses a high accuracy positioning mechanism, including clamp positioning block, positioning column, cylinder, pressing plate, positioning peg and sealing washer, the clamp positioning block upper plane is Z direction support surface, the Z direction support surface middle part of clamp positioning block extends upwards and is provided with the positioning column for the sleeving product, and the positioning column outer diameter is less than product inner hole bore, and the clamp positioning block is inbuilt cylinder, and the piston rod of cylinder is fixedly connected with the pressing plate for clamping product inner chamber after passing through the positioning column, two positioning pegs are installed vertically on the positioning column, and the pressing plate is equipped with the positioning hole cooperation with positioning peg, a plurality of sealing grooves are processed to the positioning column, and sealing washer is inbuilt in sealing groove, and sealing washer is as XY direction positioning ring, and is precisely and flexibly combined with product inner hole inner diameter. Through above -mentioned mode, the utility model positioning precision is high, and once clamping, processes three planes, and clamping frequency is less, and processing efficiency is high, and product processing quality is good, and processing stability is high.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a high-precision positioning mechanism. Background Technology

[0002] Aluminum alloy parts are die-cast and then machined, resulting in products such as... Figure 1 As shown, the product is pre-pressed, and the side holes have machining allowances. The product has an axial blank inner hole, and two square stepped surfaces at 90 degrees are set above the blank inner hole. Some features cannot be guaranteed by the mold when using the die-cast aluminum alloy blank surface as a reference. The form and position tolerances between the machined features and the blank are strictly required, which places very high demands on the design and precision of the tooling. The existing processing method requires repeated positioning of the product to be processed, which is not accurate enough and the positioning method is unreasonable. The existing positioning method cannot control the two aspects of the product's dimensions, namely the positional tolerance between the product blank inner hole and the three references ABC machined, and the positional tolerance between the references ABC of the side holes after machining.

[0003] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a high-precision positioning mechanism. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a high-precision positioning mechanism with a simple structure that can quickly inspect products. It is suitable for product inspection with various inspection requirements, especially for products with fast time requirements, which greatly improves production efficiency and reduces labor costs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high-precision positioning mechanism is provided, which includes a clamping positioning block, a positioning column, a cylinder, a pressure plate, positioning pins, and a sealing ring. The upper surface of the clamping positioning block is a Z-direction support surface. A positioning column for assembling products is provided in the middle of the Z-direction support surface of the clamping positioning block. The outer diameter of the positioning column is smaller than the inner diameter of the product. A cylinder is installed inside the clamping positioning block. The piston rod of the cylinder passes through the positioning column and is fixedly connected to the pressure plate for clamping the inner cavity of the product. Two positioning pins are vertically installed on the positioning column. The pressure plate is provided with positioning holes that cooperate with the positioning pins. The positioning column is machined with several sealing grooves. A sealing ring is installed in the sealing groove. The sealing ring acts as a positioning ring in the XY direction and flexibly and precisely fits the inner diameter of the product's inner hole.

[0006] Preferably, the positioning post has a gap of 0.1-0.2 mm between it and the inner hole of the product.

[0007] Preferably, the pressure plate has a gap of 0.05-0.1mm between it and the inner cavity of the product.

[0008] Preferably, the upper surface of the pressure plate is engraved with markings to identify the front and back sides.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] It ensures the positional accuracy between the machined features of the product, as well as the positional accuracy between the blank and the machined features, and the positioning stability. It has high positioning accuracy, can process three planes in one clamping, requires fewer clamping times, has high processing efficiency, good product processing quality, and high processing stability. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the product.

[0012] Figure 2 This is a schematic diagram of a high-precision positioning mechanism.

[0013] Figure 3 This is a schematic diagram of the clamping structure of a high-precision positioning mechanism.

[0014] Figure 4 This is a cross-sectional view of a high-precision positioning mechanism.

[0015] Among them, 1. clamp positioning block, 2. positioning column, 20. sealing groove, 3. cylinder, 4. pressure plate, 40. positioning hole, 5. positioning pin, 6. sealing ring. Detailed Implementation

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0017] Please see Figures 1 to 4 The embodiments of this utility model include:

[0018] A high-precision positioning mechanism includes a clamping positioning block 1, a positioning column 2, a cylinder 3, a pressure plate 4, a positioning pin 5, and a sealing ring 6.

[0019] The upper surface of the clamp positioning block 1 is a Z-axis support surface. A positioning post 2 for assembling the product extends upwards from the center of the Z-axis support surface of the clamp positioning block 1. The outer diameter of the positioning post 2 is smaller than the inner diameter of the product. The positioning post 2 does not directly contact the product; a gap of 0.1-0.2 mm is left between the positioning post 2 and the inner diameter of the product. A cylinder 3 is installed inside the clamp positioning block 1. The piston rod of the cylinder 3 passes through the positioning post 2 and is fixedly connected to a pressure plate 4 used to hold the inner cavity of the product. The pressure plate 4 is used to fasten and press the square stepped surface above the inner diameter of the product. Two positioning pins 5 are vertically installed on the positioning post 2, and the pressure plate 4 is provided with corresponding positioning pins 5. The matching positioning hole 40 and two positioning pins 5 are used to control the angle direction of the pressure plate 4. There should be no looseness or shaking. If the gap is large and the shaking is large, it will affect the position accuracy of the four holes on the side of the product. It is necessary to control it well during the fixture making and to check it during routine processing. The positioning column 2 is machined with several sealing grooves 20. The sealing grooves 20 are filled with sealing rings 6. The sealing rings 6 act as positioning rings in the XY direction and fit flexibly and precisely with the inner diameter of the product's inner hole. The tightness of the sealing rings 6 is controlled. If they are too loose, they will not play a positioning role. If they are too tight, they will be difficult to clamp. During processing, the tightness of the sealing rings 6 is controlled by controlling the diameter of the sealing grooves 20. The sealing rings are vulnerable parts and should be replaced in time if they are damaged.

[0020] The upper surface of the pressure plate 4 is engraved with markings to identify the front and back sides.

[0021] The pressure plate 4 has a gap of 0.05-0.1mm between it and the inner cavity of the product; otherwise, clamping will be difficult.

[0022] This utility model discloses a high-precision positioning mechanism debugging and processing steps: Clean the fixture positioning block 1 and sealing ring 6, load the product, fit the product's inner hole onto the positioning post 2 until the bottom surface of the product contacts the Z-direction support surface, place the pressure plate 4, insert the two positioning pins 5 into the positioning holes 40, and fasten the piston rod of the cylinder 3 to the pressure plate 4. The piston rod of the cylinder 3 retracts, causing the pressure plate 4 to clamp the product's inner cavity. Specifically, the pressure plate 4 presses against the square stepped surface above the product's inner hole. At this time, process the four through holes on the large flat surface of the product. After processing, the cylinder 3 is released, the product rotates -90 degrees, and the pressure plate 4, driven by the cylinder 3, clamps the product's inner cavity. Process the through holes on the side of the product. After processing, continue to rotate and clamp the product to process the through holes on the other side of the product. The processing is completed, and the product is disassembled.

[0023] This utility model discloses a high-precision positioning mechanism with high positioning accuracy, capable of machining three planes in a single clamping, requiring fewer clamping operations, resulting in high processing efficiency, good product quality, and high processing stability.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-precision positioning mechanism, characterized in that: The fixture includes a positioning block (1), a positioning pin (2), a cylinder (3), a pressure plate (4), positioning pins (5), and a sealing ring (6). The upper surface of the positioning block (1) is a Z-direction support surface. The positioning pin (2) for assembling the product is provided in the middle of the Z-direction support surface of the positioning block (1). The outer diameter of the positioning pin (2) is smaller than the inner diameter of the product. The positioning block (1) contains a cylinder (3). The piston rod of the cylinder (3) passes through the positioning pin (2) and is fixedly connected to the pressure plate (4) for clamping the inner cavity of the product. Two positioning pins (5) are vertically installed on the positioning pin (2). The pressure plate (4) is provided with positioning holes (40) that cooperate with the positioning pins (5). The positioning pin (2) is machined with several sealing grooves (20). The sealing grooves (20) contain sealing rings (6). The sealing rings (6) serve as positioning rings in the XY direction and are flexibly and precisely fitted with the inner diameter of the product's inner hole.

2. The high-precision positioning mechanism according to claim 1, characterized in that: The positioning pin (2) has a gap of 0.1-0.2mm between it and the inner hole of the product.

3. The high-precision positioning mechanism according to claim 1, characterized in that: The pressure plate (4) has a gap of 0.05-0.1mm between it and the inner cavity of the product.

4. The high-precision positioning mechanism according to claim 1, characterized in that: The upper surface of the pressure plate (4) is engraved with markings to identify the front and back sides.

Images