Novel involute spline mandrel fan-shaped supporting device

Abstract

The utility model belongs to the technical field of high-precision grinding machining of mandrels of large extrusion granulation units, and discloses a novel fan-shaped supporting device for an involute spline mandrel. 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 utility model solves the problem that the high-precision involute spline mandrel cannot realize high-precision and stable machining support after hobbing, realizes the high-precision grinding effect, and comprehensively solves the problem of high-precision grinding of high-precision involute spline parts.

Description

TECHNICAL FIELD

[0001] The utility model relates to the core shaft high-precision grinding processing technical field of large extrusion granulator unit, especially relates to a new type of involute spline core shaft sector support device. BACKGROUND

[0002] High-precision involute spline core shaft processing technology is a domestic key project, and there is no industry processing experience and innovative method for reference in China. The pain points and difficulties of the key core components processing technology of the large extrusion granulator unit in the petrochemical industry need to be completely solved. At present, there are four companies in the world that have the production capacity of "350, 380" large units, including two Japanese companies, one German company and four Chinese companies. The length of the high-precision involute spline core shaft is 13 meters. The international highest standard for the shape and position precision of the part processing is that the straightness requirement in the full length range is 0.15 mm, and the concentricity is 0.03 mm. In order to achieve the international high-end involute spline product high-precision processing technology breakthrough, it is necessary to solve the problem of stable support of the involute spline core shaft after hobbing. Before the innovation, there is no suitable stable support device for the high-precision involute spline core shaft after hobbing in China. It is impossible to achieve high-precision processing effect. Through the design and production of the special support device for the involute spline core shaft, the precision and stability in the grinding process are ensured, and finally the international high-end involute spline product high-precision processing technology breakthrough is realized. CONTENT OF THE UTILITY MODEL

[0003] After the high-precision involute spline core shaft is hobbed, high-precision grinding processing is needed. Because the involute spline of the outer circle of the core shaft has been processed, the outer circle is an intermittent tooth surface, and it is impossible to directly support and grind. The optimal processing technology scheme cannot be smoothly implemented, so that the core shaft processing data cannot meet the international highest standard. In order to solve the problem of grinding precision and stability of the high-precision involute spline core shaft after hobbing, the sector surface support principle is used to improve the positioning stability, so as to realize the improvement of processing efficiency and processing precision, and completely solve the neck blocking problem of the high-precision involute spline core shaft processing precision of the domesticization. A new type of involute spline core shaft sector support device is provided.

[0004] The technical scheme of the utility model is as follows: a new type of involute spline core shaft sector support device, which comprises a sector support body 1, a side support adjusting device 2, a lower support adjusting device 3, a locking pressure plate 4, a lower support column 5, a sector support tile body 6, a side support column 7 and a spherical positioning rod 8.

[0005] The sector support body 1 supports two side edges, and the included angle between the two side edges and the vertical line is 2°; the locking pressure plate 4 is installed at the bottom of the two sides, which is used for adjusting and fixing the position of the sector support body 1 on the slide rail.

[0006] The side of the fan-shaped support body 1 is respectively installed with a side support adjusting device 2 and a lower support adjusting device 3.

[0007] The side support adjusting device 2 is connected with one end of a side support column 7 and is used for adjusting the telescopic amount of the side support column 7; the other end of the side support column 7 is connected with the side of a fan-shaped support tile 6.

[0008] The lower support adjusting device 3 is in contact with one end of a lower support column 5 and is used for adjusting the telescopic amount of the lower support column 5; the other end of the lower support column 5 is connected with the fan-shaped support tile 6.

[0009] The fan-shaped support tile 6 is made of nylon; the fan-shaped arc of the fan-shaped support tile 6 is in the interval of 174° to 178°, so as to ensure that the number of teeth wrapped by the novel involute spline shaft fan-shaped support device is more than 48% of the total number of teeth of the involute spline shaft.

[0010] The spherical positioning rod 8 is provided with two, one end of which is connected with the fan-shaped support tile 6, and the other end is respectively clamped in two semicircular grooves on the front 10° inclined surface of the side support column 7, only two spherical positioning rods 8 are used for radial rotation direction single positioning, so as to ensure that the fan-shaped support tile 6 realizes automatic centering when adhering to the outer circle of the spline shaft, and ensures that the contact rate with the spline tooth surface of the part is more than 90%.

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

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

[0013] The novel involute spline shaft fan-shaped support device is provided with multiple, the straightness between which is within an error of 0.30 mm, and the roundness and concentricity error of the fan-shaped support tile 6 is controlled within 0.05 mm.

[0014] A use method of a novel involute spline shaft fan-shaped support device, including the following steps:

[0015] Step 1, install the fan-shaped support body 1, the side support adjusting device 2, the lower support adjusting device 3, the lower support column 5, the side support column 7, evenly install multiple fan-shaped support devices on the equipment track with an interval of 2500 mm, fix by using the locking pressing plate 4, and ensure that the straightness is controlled within 0.30 mm;

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

[0017] Step 3, before grinding, detect by using the micrometer, align the upper generatrix and the side generatrix of the spline shaft by using the side support adjusting device 2 and the lower support adjusting device 3, detect the accuracy values under the condition that the spline shaft is bound without free degree, and control the values within 0.10mm, the two-end top-holding mode selects high-precision rotary elastic center; the positioning of the spline shaft is completed;

[0018] Step 4, use the new involute spline shaft fan-shaped support device to position the original support reference point of the spline shaft, and use the micrometer to detect and verify that the four fan-shaped support device support reference points are consistent with the two-end center reference, and the accuracy is controlled within 0.02mm;

[0019] Step 5, during the grinding process, the side support adjusting device 2 and the lower support adjusting device 3 are continuously adjusted to ensure the stability and accuracy requirements of the spline shaft during the grinding process.

[0020] The high-precision involute spline shaft fan-shaped support device is an original technology in the industry, which is a direct reflection of new quality productivity, and an original processing technology scheme is completed, which fills the gap of domestic super-long high-precision involute spline part processing technology. The problem of high-precision, stable processing support after gear hobbing of high-precision involute spline shaft is solved, high-precision grinding processing effect is realized, grinding support stability and combination rate are improved, the fan-shaped support tile is made of nylon (polyamide Nylon) with flexibility and ductility, the traditional columnar support mode is upgraded and optimized, and the high-precision grinding processing problem of high-precision involute spline parts is solved. The side support column and the lower support column are adjusted during the grinding process to ensure the constancy of the fan-shaped support device to the shaft fan support force, ensure that the machining accuracy reaches the highest standard in the industry, and finally realize the upgrading of the high-precision involute spline shaft domestic special processing technology through the application of the fan-shaped support device, and realize the industry first. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0024] In the diagram: 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; 7-side support column; 8-spherical positioning rod. Detailed Implementation

[0025] This utility model proposes a novel sector-shaped support device for an involute spline mandrel, such as... Figure 1 As shown: It consists of 1 fan-shaped support body, 1 side support adjustment device 2, 1 lower support adjustment device 3, 2 locking pressure plates 4, 1 lower support column 5, 1 fan-shaped support tile body 6, 1 side support column 7, and 2 spherical positioning rods 8.

[0026] The specific implementation method is as follows: Before finishing, high-precision equipment is used to check and verify information such as straightness, roundness, concentricity, and bending trend value. The straightness between the fan-shaped support devices should be within 0.30mm, the roundness of the fan-shaped support pad should be within 0.05mm, and the concentricity of the fan-shaped support pad should be within 0.05mm. This device is suitable for situations where the bending trend value of the spline mandrel is within 60°. Using the high-precision fan-shaped support device, the original support reference point is positioned, and the accuracy values ​​of various aspects are checked and controlled within 0.10mm when the mandrel is not constrained by any degree of freedom. High-precision rotary elastic centers are used for the two ends to support the mandrel. The advantage is that it reduces the increase of friction in the center hole and increases the support toughness and buffer force. The middle support of the mandrel uses an involute spline mandrel fan-shaped support device. The fan-shaped support pad is made of polyamide (Nylon), which has strong toughness and wear resistance, good support stability, and is not prone to wear and tear on the mandrel surface. The mandrel is supported by four sector-shaped support devices during machining (e.g., Figure 3 As shown), before grinding, a dial indicator should be used to align the upper and side generatrices of the mandrel to ensure the straightness of the grinding process. During use, the fan-shaped support body of the fan-shaped support device should extend 59.4° from the reference point below the vertical line of the arc center towards the grinding side. The number of teeth enclosed by the fan-shaped support device should exceed 48% of the total number of teeth on the involute spline mandrel. The fan arc should be between 174° and 178°. The fan-shaped support body and the side and bottom support columns are designed separately, using only two spherical positioning rods for single radial rotation positioning, ensuring a contact rate of over 90% with the spline tooth surface of the part (e.g., ...). Figure 2 (As shown).

Claims

1. A new type of involute spline mandrel sector support device, characterized by, The new involute spline mandrel sector support device comprises a sector support body (1), a side support adjusting device (2), a lower support adjusting device (3), a locking pressing plate (4), a lower support column (5), a sector support tile (6), a side support column (7) and a spherical positioning rod (8). The sector support body (1) is supported on both sides with an angle of 2° with the vertical line; the bottom of both sides is provided with a locking pressing plate (4) for adjusting and fixing the position of the sector support body (1) on the slide rail; The sector support body (1) is provided with a side support adjusting device (2) and a lower support adjusting device (3) on the side surface respectively; The side support adjusting device (2) is connected to one end of the side support column (7) for adjusting the extension amount of the side support column (7); the other end of the side support column (7) is connected to the side surface of the sector support tile (6); The lower support adjusting device (3) is in contact with one end of the lower support column (5) for adjusting the extension amount of the lower support column (5); the other end of the lower support column (5) is connected to the sector support tile (6); The sector support tile (6) is made of nylon; the sector arc of the sector support tile (6) is in the range of 174° to 178°, which ensures that the number of teeth wrapped by the new involute spline mandrel sector support device is more than 48% of the total number of teeth of the involute spline mandrel; The spherical positioning rod (8) is provided with two ends, one end of which is connected to the sector support tile (6), and the other end is respectively clamped in the two semicircular grooves on the front end 10° inclined surface of the side support column (7); only two spherical positioning rods (8) are used for radial rotation direction single positioning, which ensures that the sector support tile (6) realizes automatic centering when it is attached to the spline mandrel outer circle, and ensures that the contact rate with the spline tooth surface of the part is more than 90%.

2. The new type of involute spline mandrel sector support device according to claim 1, characterized in that, The contact surface between the lower support adjusting device (3) and the lower support column (5) is an inclined surface.

3. A new involute spline mandrel segment support device according to claim 1 or 2, characterized in that, The arc length of the sector support tile (6) extends to the direction of the grinding contact point between the grinding wheel and the spline mandrel, and the extension angle from the vertical line connected to the arc center to the direction of the grinding contact point between the grinding wheel and the spline mandrel is 59.4°.

4. The new type of involute spline mandrel sector support device according to claim 3, characterized in that, The new involute spline mandrel sector support device is provided with multiple devices, the straightness between which is within an error of 0.30mm, and the roundness and concentricity error of the sector support tile (6) is controlled within 0.05mm.

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