Novel involute spline mandrel fan-shaped supporting device and using method thereof

Abstract

The invention belongs to the technical field of high-precision grinding machining of mandrels of large extrusion granulation units, and discloses a novel involute spline mandrel fan-shaped supporting device and a using method thereof. Locking pressing plates are installed on the two sides of the bottom of the fan-shaped supporting body and located on the sliding rails. The side supporting adjusting device adjusts the telescopic amount of the side supporting column. The lower supporting adjusting device adjusts the telescopic amount of the lower supporting column. The other end of the lower supporting column is connected with a fan-shaped supporting tile body; the fan-shaped supporting tile body is made of nylon; the fan-shaped arc of the fan-shaped supporting tile body is in an interval; one end of the spherical positioning rod is connected with the fan-shaped supporting tile body, and the other end of the spherical positioning rod is clamped in two semicircular grooves in the 10-degree inclined face of the front end of the side supporting column. The problem that high-precision and stable machining supporting cannot be achieved after hobbing of the high-precision involute spline mandrel is solved, the high-precision grinding machining effect is achieved, and the high-precision grinding machining problem of high-precision involute spline parts is comprehensively solved.

Description

Technical Field

[0001] The invention relates to the technical field of high-precision grinding of a mandrel of a large-scale extrusion granulation unit, and in particular to a novel involute spline mandrel fan-shaped supporting device and a use method thereof. Background Art

[0002] The high-precision involute spline mandrel processing technology is a key project for localization. There is no industry processing experience and innovative methods to learn from in China. It is necessary to thoroughly solve the pain points and difficulties of the key core parts processing technology of large-scale extrusion granulation units in the petrochemical industry. At present, there are four companies in the world that have the production capacity of "350, 380" large units, namely two companies in Japan, one company in Germany and a large rubber and plastic company in China. The length of the high-precision involute spline mandrel is 13 meters. The international highest standard for the shape and position accuracy of the parts processing is a straightness requirement of 0.15mm in the entire length range and a concentricity of 0.03mm. In order to achieve the international high-height processing accuracy standard, it is necessary to solve the problem of stable support of the involute spline mandrel after gear hobbing. Summary of the invention

[0003] After hobbing, the high-precision involute spline mandrel needs to be ground with high precision. Because the involute spline of the mandrel's outer circle has been processed, the outer circle is an intermittent tooth surface, which cannot be directly supported and ground. The optimal processing technology cannot be smoothly implemented, resulting in the mandrel's various processing data failing to meet the highest international standards. In order to solve the grinding accuracy and stability problems of the high-precision involute spline mandrel after hobbing, the fan-shaped surface support principle is used to improve the processing positioning stability, thereby achieving improved processing efficiency and processing accuracy, and comprehensively solving the problem of domestic high-precision involute spline mandrel processing accuracy. A new type of involute spline mandrel fan-shaped support device and its use method are proposed.

[0004] The technical solution of the present invention is as follows: a novel involute spline core shaft fan-shaped support device, comprising a fan-shaped support body 1, a side support adjustment device 2, a lower support adjustment device 3, a locking pressure plate 4, a lower support column 5, a fan-shaped support tile body 6, a side support column 7 and a spherical positioning rod 8;

[0005] The fan-shaped support body 1 has two sides whose angles with the vertical line are 2° respectively; locking plates 4 are installed on both sides of the bottom to adjust and fix the position of the fan-shaped support body 1 on the slide rail;

[0006] The side surfaces of the fan-shaped support body 1 are respectively installed with a side support adjustment device 2 and a lower support adjustment device 3;

[0007] The side support adjustment device 2 is connected to one end of the side support column 7 and is used to adjust the extension amount of the side support column 7; the other end of the side support column 7 is connected to the side of the fan-shaped support tile body 6;

[0008] One end of the lower support adjustment device 3 contacts one end of the lower support column 5, and is used to adjust the telescopic amount of the lower support column 5; the other end of the lower support column 5 is connected to the fan-shaped support tile body 6;

[0009] The fan-shaped support shoe body 6 is made of nylon; the fan-shaped arc of the fan-shaped support shoe body 6 is in the range of 174° to 178°, ensuring that the number of teeth wrapped by the fan-shaped support device of the new involute spline mandrel exceeds 48% of the total number of teeth of the involute spline mandrel;

[0010] The spherical positioning rods 8 are provided with two, one end of which is connected to the fan-shaped support tile body 6, and the other end is respectively clamped in two semicircular grooves on the 10° inclined surface of the front end of the side support column 7. Only two spherical positioning rods 8 are used for single positioning in the radial rotation direction, ensuring that the fan-shaped support tile body 6 is automatically centered when attached to the outer circle of the spline core shaft, ensuring a contact rate of more than 90% with the spline tooth surface of the part.

[0011] The contact surface between the lower support adjustment device 3 and the lower support column 5 is an inclined surface.

[0012] The arc length of the fan-shaped support shoe body 6 extends in the direction of the grinding contact point between the grinding wheel and the spline core shaft, and the extension angle from the vertical line connected to the arc center to the grinding contact point between the grinding wheel and the spline core shaft is 59.4°.

[0013] The novel involute spline core shaft fan-shaped support device is provided in plurality, and the straightness between them is within 0.30 mm error, and the roundness and concentricity errors of the fan-shaped support shoe body 6 are controlled within 0.05 mm.

[0014] A method for using a novel involute spline core shaft fan-shaped support device comprises the following steps:

[0015] Step 1: Install the fan-shaped support body 1, the side support adjustment device 2, the lower support adjustment device 3, the lower support column 5, and the side support column 7. Install multiple fan-shaped support devices evenly on the equipment track at a spacing of 2500mm, fix them with the locking plate 4, and ensure that the straightness is controlled within 0.30mm;

[0016] Step 2: Use the spherical positioning rod 8 to install the fan-shaped support tile 6 on the side support column 7 and the lower support column 5. The micrometer is fixed on the grinding wheel head frame to detect and verify the roundness and concentricity of the four fan-shaped support tiles. The accuracy is controlled within 0.05mm. During the grinding process, the four fan-shaped support tiles 6 complete the self-positioning function; the positioning of the involute spline mandrel fan-shaped support device is completed;

[0017] Step 3, before grinding, use the micrometer to detect, use the side support adjustment device 2 and the lower support adjustment device 3 to align the upper generatrix and the side generatrix of the spline mandrel, detect the precision values ​​of the spline mandrel without freedom constraints, and control them within 0.10mm. Use high-precision rotary elastic tops for the top holding method at both ends; the positioning of the spline mandrel is completed;

[0018] Step 4: Use the new involute spline mandrel fan-shaped support device to locate the original support reference point for spline mandrel grinding, and use a micrometer to verify that the support reference points of the four fan-shaped support devices are consistent with the top references at both ends, with an accuracy controlled within 0.02mm;

[0019] Step 5: During the grinding process, the side support adjustment device 2 and the lower support adjustment device 3 should be continuously fine-tuned to ensure the stability and precision requirements of the spline core shaft during grinding.

[0020] Beneficial effects of the present invention: The fan-shaped support device for the high-precision involute spline mandrel is an original and original technology in the industry, and an original processing technology plan has been formulated in the industry, filling the domestic gap in the processing technology of ultra-long high-precision involute spline parts. It solves the problem that the high-precision involute spline mandrel cannot achieve high-precision and stable processing support after hobbing. To achieve the high-precision grinding effect, it is necessary to comprehensively improve the stability and bonding rate of the grinding support, and use nylon (polyamide Nylon) with flexibility and ductility to make the fan-shaped support tile body, upgrade and optimize the traditional columnar support method, and comprehensively solve the high-precision grinding processing problem of high-precision involute spline parts. The grinding process must be fine-tuned through the side support column and the lower support column to ensure the constancy of the fan-shaped support device on the fan surface of the mandrel, and ensure that the processing accuracy of each item reaches the highest industry standard. Through the application of the fan-shaped support device, the localization of the high-precision involute spline mandrel special processing technology upgrade is finally realized, achieving an industry first. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the fan-shaped support device of the new involute spline core shaft.

[0022] Figure 2 It is a schematic diagram of the working state structure of the new involute spline core shaft fan-shaped support device.

[0023] Figure 3 It is a schematic diagram of the combined use of the new involute spline mandrel fan-shaped support device.

[0024] In the figure: 1-fan-shaped support body; 2-side support adjustment device; 3-lower support adjustment device; 4-locking pressure plate; 5-lower support column; 6-fan-shaped support tile body; 7-side support column; 8-spherical positioning rod. DETAILED DESCRIPTION

[0025] The present invention proposes a novel involute spline core shaft fan-shaped support device, such as Figure 1 As shown: it consists of a fan-shaped support body, a side support adjustment device 2, a lower support adjustment device 3, two locking pressure plates 4, a lower support column 5, a fan-shaped support tile body 6, a side support column 7, and two spherical positioning rods 8.

[0026] The specific implementation method is as follows: Before finishing, high-precision equipment is used to detect and verify information such as straightness, roundness, concentricity, and bending tendency. The straightness between the fan-shaped support devices should be within 0.30mm, the roundness of the fan-shaped support tile should be within 0.05mm, and the concentricity of the fan-shaped support tile should be within 0.05mm. When the device is used, it is suitable for the case where the bending tendency value of the spline core shaft is within 60°. The original support reference point is positioned using a high-precision fan-shaped support device, and the various precision values ​​of the core shaft are detected without freedom constraints, and are controlled within 0.10mm. The two ends of the support method use high-precision rotary elastic tops, which have the advantages of reducing the increase in the friction force of the top hole and increasing the toughness and buffering force of the top support. The middle support of the core shaft uses an involute spline core shaft fan-shaped support device. The fan-shaped support tile is made of polyamide (Nylon), which has strong toughness and wear resistance, good support stability, and is not easy to cause wear and tear on the core shaft surface. The mandrel is supported by four fan-shaped support devices during processing (such as Figure 3 As shown), before grinding, the upper and side generatrix of the mandrel should be aligned with a micrometer to ensure the straightness of the grinding process. During the use of the fan-shaped support body of the fan-shaped support device, it is necessary to ensure that the lower reference point of the arc center vertical line extends 59.4° toward the grinding side, and the number of teeth wrapped by the fan-shaped support device exceeds 48% of the total number of teeth of the involute spline mandrel. The fan-shaped arc is in the range of 174° to 178°. The fan-shaped support tile body is a split design from the side and lower support columns. Only two spherical positioning rods are used for single positioning in the radial rotation direction, which can ensure a contact rate of more than 90% with the spline tooth surface of the part (such as Figure 2 shown).

Claims

1. A novel involute spline mandrel fan-shaped support device, characterized in that: The novel involute spline core shaft fan-shaped support device comprises a fan-shaped support body (1), a side support adjustment device (2), a lower support adjustment device (3), a locking pressure plate (4), a lower support column (5), a fan-shaped support tile body (6), a side support column (7) and a spherical positioning rod (8); The fan-shaped support body (1) has two sides whose angles with the vertical line are 2° respectively; locking plates (4) are installed on both sides of the bottom to adjust and fix the position of the fan-shaped support body (1) on the slide rail; The side surfaces of the fan-shaped support body (1) are respectively installed with a side support adjustment device (2) and a lower support adjustment device (3); The side support adjustment device (2) is connected to one end of the side support column (7) and is used to adjust the extension and contraction amount of the side support column (7); the other end of the side support column (7) is connected to the side surface of the fan-shaped support tile body (6); One end of the lower support adjustment device (3) contacts one end of the lower support column (5) and is used to adjust the telescopic amount of the lower support column (5); the other end of the lower support column (5) is connected to the fan-shaped support tile body (6); The fan-shaped support shoe body (6) is made of nylon; the fan-shaped arc of the fan-shaped support shoe body (6) is in the range of 174° to 178°, ensuring that the number of teeth wrapped by the fan-shaped support device of the novel involute spline mandrel exceeds 48% of the total number of teeth of the involute spline mandrel; Two spherical positioning rods (8) are provided, one end of which is connected to the fan-shaped support tile body (6), and the other end is respectively clamped in two semicircular grooves on the 10° inclined surface of the front end of the side support column (7). Only two spherical positioning rods (8) are used for single positioning in the radial rotation direction, ensuring that the fan-shaped support tile body (6) is automatically centered when attached to the outer circle of the spline core shaft, ensuring a contact rate of more than 90% with the spline tooth surface of the part.

2. The novel involute spline core shaft fan-shaped support device according to claim 1 is characterized in that: The contact surface between the lower support adjustment device (3) and the lower support column (5) is an inclined surface.

3. The novel involute spline core shaft fan-shaped support device according to claim 1 or 2, characterized in that: The arc length of the fan-shaped support shoe (6) extends in the direction of the grinding contact point between the grinding wheel and the spline core shaft, and the extension angle from the vertical line connected to the arc center to the grinding contact point between the grinding wheel and the spline core shaft is 59.4°.

4. The novel involute spline core shaft fan-shaped support device according to claim 3 is characterized in that: The novel involute spline core shaft fan-shaped support device is provided in plurality, and the straightness error between them is within 0.30 mm, and the roundness and concentricity error of the fan-shaped support shoe body (6) is controlled within 0.05 mm.

5. A method for using the novel involute spline mandrel fan-shaped support device according to claim 4, characterized in that: The steps include: Step 1, install the fan-shaped support body (1), the side support adjustment device (2), the lower support adjustment device (3), the lower support column (5), and the side support column (7), and evenly install multiple fan-shaped support devices on the equipment track at a spacing of 2500mm, fix them with a locking plate (4), and ensure that the straightness is controlled within 0.30mm; Step 2: Use the spherical positioning rod (8) to install the fan-shaped support tile (6) on the side support column (7) and the lower support column (5), fix the micrometer on the grinding wheel head frame, detect and verify the roundness and concentricity of the four fan-shaped support tiles, and control the accuracy within 0.05mm. During the grinding process, the four fan-shaped support tiles (6) complete the self-positioning function; the positioning of the involute spline mandrel fan-shaped support device is completed; Step 3: Before grinding, the upper generatrix and the side generatrix of the spline mandrel are aligned by using a micrometer test, and the side support adjustment device (2) and the lower support adjustment device (3) are used to detect the various precision values ​​of the spline mandrel without freedom constraints, and the precision values ​​are controlled within 0.10 mm. The two ends of the support method use high-precision rotary elastic tops; the positioning of the spline mandrel is completed; Step 4: Use the new involute spline mandrel fan-shaped support device to locate the original support reference point for spline mandrel grinding, and use a micrometer to verify that the support reference points of the four fan-shaped support devices are consistent with the top references at both ends, with an accuracy controlled within 0.02mm; Step 5: During the grinding process, the side support adjustment device (2) and the lower support adjustment device (3) should be continuously fine-tuned to ensure the stability and accuracy requirements of the spline core shaft during the grinding process.

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