CN103949712B - The processing method of form and position tolerance is ensured in female keyway slotting process - Google Patents

Abstract

The invention discloses a processing method for guaranteeing shape and position tolerance in the keyway slotting process in a hole. The steps include: step 1, selecting a suitable process block and positioning it; step 2, determining the position of the keyway in the first hole of the workpiece and Proceed with processing; use the dial gauge to correct the full length of the initial datum plane of the process block, then the position of the longitudinal axis directly below the workpiece is the zero reference of the rotation angle of the keyway centerline in the first hole of the workpiece, and start processing the first hole of the workpiece Internal keyway; step 3, determine the position of the keyway in the next hole of the workpiece and process it, and so on, complete the processing of all keyways in the hole, and it is completed. The method of the invention solves the problem of the position degree among multiple key grooves in different orientations, and can satisfy the slotting processing of workpieces of different specifications on different slotting machines.

Description

Machining method to ensure shape and position tolerance during slotting of keyway in hole

technical field

The invention belongs to the technical field of mechanical processing and manufacturing, and relates to a processing method for ensuring shape and position tolerances during keyway slotting in holes.

Background technique

On parts such as hubs, there are often multiple keyways distributed on the same circumference and on different generatrices. The most common distributions are 90°, 120°, and 180°. The existing technology adopts manual scribing for positioning and is processed on ordinary machine tools. Keyways, it is difficult to ensure the positional accuracy between each keyway, the work efficiency is low, and the product quality cannot be effectively guaranteed. Due to the large error of manual scribing, it is difficult to ensure the shape and position tolerance requirements between the key grooves when inserting the key grooves, which has become a technical problem that needs to be overcome urgently.

Contents of the invention

The invention provides a processing method for guaranteeing shape and position tolerance during keyway slotting in a hole, which solves the problem that in the prior art, when multiple keyways on different busbars on the same circumference of a wheel hub are processed, it is difficult to guarantee each keyway by manual marking. The position accuracy between the keyways and the problem of low work efficiency.

The technical solution adopted by the present invention is a processing method for ensuring shape and position tolerance during keyway slotting in a hole, which is specifically implemented according to the following steps:

Step 1. Select a suitable process block and position it;

Step 2. Determine the position of the keyway in the first hole of the workpiece and process it;

Use the dial gauge to find the full length of the initial datum plane of the process block, then the position of the longitudinal axis directly below the workpiece is the zero reference of the rotation angle of the center line of the keyway in the first hole of the workpiece, and start processing the keyway in the first hole of the workpiece;

Step 3. Determine the position of the keyway in the next hole of the workpiece and process it.

By analogy, the processing of keyways in all holes is completed.

The beneficial effects of the present invention are: through the simple and practical reference conversion tool, the problem of the position degree between multiple keyways in different orientations is solved, and the slotting processing of workpieces of different specifications on different slotting machines can be satisfied, and it can be adjusted according to the type of parts. This method can be adapted for extended application. The parts used in this method have simple structure, convenient and fast operation, direct and reliable precision guarantee method, and the manufacturing process meets HSE requirements, which provides a new idea and new method for the processing of key grooves in holes.

Description of drawings

Fig. 1 is that implements 90 ° of keyway machining working principle figure in the inventive method;

Fig. 2 is the implementation of 90 ° keyway processing working principle diagram two in the inventive method;

Fig. 3 is that implements 120 ° of keyway machining working principle diagrams in the inventive method;

Fig. 4 is the implementation of 120 ° keyway processing working principle diagram two in the inventive method;

Fig. 5 is the working principle diagram three of implementing 120° keyway processing in the method of the present invention;

Fig. 6 is that implements 90 ° keyway in the inventive method and is used technology block structural diagram;

Fig. 7 is that implements 90 ° keyway in the inventive method and is used technology block structure figure two;

Fig. 8 is the process block structural diagram of implementing 180 ° keyway in the inventive method;

Fig. 9 is that in the inventive method, implement 180 ° of keyways with technological block structural drawing two;

Fig. 10 is that in the inventive method, implement 120 ° of keyway technology block structural diagrams;

Fig. 11 is a block diagram 2 for implementing a 120° keyway in the method of the present invention.

In the figure, 1. Process block, 2. Workpiece, 3. Workbench, 4. Bolt, 5. Nut, 6. Dial indicator.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The processing method for guaranteeing shape and position tolerance in the keyway slotting process of the present invention mainly depends on a set of process device, the main body of which is a process block 1, a through hole is arranged at the center of the process block 1, and the center of the process block 1 Bolts 4 and nuts 5 thereof are installed in the through holes to be fixedly connected with the workpiece 2 .

The shape of the process block 1 is set according to the relative position requirements between the keyways of the workpiece, and the process block 1 is also divided into three styles: for the keyway of 90° or 180°, the shape of the process block 1 is made into a cube or a cuboid, that is, as The cube process block in Fig. 6 and Fig. 7, or the cuboid process block in Fig. 8 and Fig. 9; for a keyway of 120°, the shape of process block 1 is made as an equilateral triangle with an included angle of 60° or 120° , as shown in Fig. 10, the equilateral triangle process block in Fig. 11;

The surface processing accuracy of all process blocks 1 is 0.8 standard specification; according to the size of the workpiece, the size of the processing surface and the accuracy requirements of the workpiece, the length of the alignment reference plane of the process block is determined, and the alignment reference plane is generally not less than 150mm.

Referring to Fig. 1-Fig. 5, the processing method for ensuring shape and position tolerance in the slotting process of the keyway in the hole of the present invention is implemented according to the following steps:

Step 1. Select a suitable process block and position it

According to the distribution angle of the number of keyways in the hole to be processed by the workpiece 2, look down on the workpiece 2, refer to Figure 1 and Figure 2, and use the cube process block for positioning when processing the keyways in the hole according to the 90° rotation distribution; refer to Figure 3, Figure 4, Figure 5, when the keyway in the hole is processed according to the 120° and 240° rotation distribution, use the regular triangle process block for positioning;

Place the workpiece 2 flat on the workbench 3 of the slotting machine, align the rotation center of the workpiece 2 with the rotation center of the workbench 3, install the regular triangle or cube process block on the right side of the horizontal axis of the workpiece 2, and pass the bolt 4 and The nut 5 fixes the process block 1 on the workbench 3; or, if the size of the workpiece 2 is too high or too large, fix the process block 1 at a suitable position on the upper surface of the workpiece 2, and then fix the workpiece 2 on the workbench 3 superior;

Step 2. Determine the position of the keyway in the first hole of workpiece 2 and process it

Referring to Figure 1 and Figure 3, use the dial indicator 6 to correct the full length of the initial reference plane of the process block 1, then the position of the longitudinal axis directly below the workpiece 2 is the zero reference of the rotation angle of the centerline of the keyway in the first hole of the workpiece 2 , start to process the keyway in the first hole of workpiece 2;

Step 3. Determine the position of the keyway in the next hole of the workpiece 2 and process it

Referring to Fig. 2 and Fig. 4, after the keyway in the first hole of workpiece 2 is processed, the position of process block 1 is fixed, and the rotating worktable 3, the workpiece 2 rotates together with workbench 3, and the second datum plane of process block 1 (A datum plane adjacent to the first datum plane) is corrected, and the angle change value between the second datum plane of process block 1 and the initial datum plane is controlled to ensure that the keyway in the next hole of workpiece 2 is consistent with the previous hole The accuracy of the angular position of the center line between the inner keyways, start to process the keyway in the second hole of the workpiece 2;

That is to say, by controlling the included angle tolerance of the front and rear datum planes of the process block 1 and measuring the runout of the alignment datum plane before and after rotation, the rotation angle of the workpiece 2 can be precisely controlled to ensure that the keyway in the next hole of the workpiece 2 is consistent with the previous one. The angle position between the key grooves in the hole requires controlling the angle of the center line of the key groove of the workpiece 2 to be the same as or an integer multiple of the angle between the alignment datum plane of the process block 1.

By analogy, the processing of keyways in all holes is completed.

When machining keyways in each hole, according to the accuracy requirements of the workpiece, the runout value of the entire length of the reference plane of process block 1 must be smaller than the shape and position tolerance value of the workpiece.

Claims (5)

1. A processing method for ensuring shape and position tolerances in a keyway slotting process in a hole, characterized in that, it is specifically implemented according to the following steps: Step 1, selecting a suitable process block (1) and positioning it, The selection standard of the described process block (1) is, according to the distribution angle of the keyway quantity in the hole that needs to be processed according to the workpiece (2), when the keyway in the hole is processed according to the 90 ° rotation distribution, the cube process block is used for positioning; according to 120 °, 240 °rotational distribution processing keyway in the hole, use the regular triangle process block for positioning; Step 2, determine the position of the keyway in the first hole of the workpiece (2) and process it; Use the dial indicator (6) to correct the overall length of the initial datum plane of the process block (1), then the position of the longitudinal axis directly below the workpiece (2) is the zero position of the rotation angle of the centerline of the keyway in the first hole of the workpiece (2) Datum, start to process the keyway in the first hole of the workpiece (2); Step 3, determine the position of the keyway in the next hole of the workpiece (2) and process it, By analogy, the processing of keyways in all holes is completed. 2. The processing method for guaranteeing shape and position tolerances during keyway slotting in a hole according to claim 1, characterized in that, in step 1, the positioning process is: the work of placing the workpiece (2) flat on the slotting machine On the table (3), align the center of rotation of the workpiece (2) with the center of rotation of the worktable (3), install the regular triangle or cube process block on the right side of the horizontal axis of the workpiece (2), and pass the bolt (4) and nuts (5) to fix the process block (1) on the workbench (3). 3. The machining method for guaranteeing shape and position tolerances during keyway slotting in a hole according to claim 1, characterized in that, in step 1, the positioning process is: placing the workpiece (2) flat on the slotting machine On the table (3), align the center of rotation of the workpiece (2) with the center of rotation of the worktable (3). If the size of the workpiece (2) is too high or too large, fix the process block (1) on the workpiece (2) The surface is in a suitable position, and then the workpiece (2) is fixed on the workbench (3). 4. according to claim 2 or 3 described in the processing method of guaranteeing shape and position tolerance in the slotting process of the keyway in the hole, it is characterized in that, in step 3, after the first keyway in the hole of the workpiece (2) is processed, the process The position of block (1) is fixed, the rotating worktable (3), the workpiece (2) rotates together with the working table (3), and the second datum plane of the process block (1) is aligned, by controlling the process block (1) The angle change value between the second datum plane and the initial datum plane is to ensure the accuracy of the center line angular position between the keyway in the next hole of the workpiece (2) and the keyway in the previous hole, and start to process the second one of the workpiece (2) Keyway in hole. 5. according to claim 2 or 3 described in the processing method of guaranteeing geometrical tolerance in the keyway slotting process in hole, it is characterized in that, in step 3, by controlling the included angle tolerance of process block (1) front and back datum plane and measuring The beating of the alignment reference plane before and after the rotation is used to precisely control the rotation angle of the workpiece (2) to ensure the angular position between the keyway in the next hole of the workpiece (2) and the keyway in the previous hole. It is required to control the workpiece (2) ) The angle of the center line of the keyway is the same as or an integer multiple of the included angle of the alignment reference plane of the process block (1).