JPH063524U - Thread Groove Alignment Structure for Multiple Female Thread Grindings - Google Patents

Abstract

(57) [Abstract] [Purpose] To shorten the screw groove alignment time and improve the machine operating rate, and to manufacture a large number of highly accurate and stable quality female thread grinds. [Structure] The reference hole used as positive in the pre-machining is inserted into the reference pin on the chuck side of the grinding and finishing machine, and the phase is adjusted for screw groove alignment. [Effect] The setup time is shortened, the machine operation rate is improved, and the screw groove can be accurately aligned, so that highly accurate screw grinding can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention facilitates the positioning of the grindstone and the thread groove of a large number of internally threaded objects of the same shape, and is suitable for efficient thread finish grinding, and has a thread groove alignment structure for a number of internally threaded objects Regarding

[0002]

[Prior art]

 The internally threaded product is processed in a state where the thread groove is pre-processed before the finish grinding process and the finishing allowance necessary for the finish grinding is left. When mounting a preprocessed female thread grind on a machine for thread groove finish grinding, it is necessary to position the preprocessed thread groove and the internal grinding wheel. If the thread groove alignment is incomplete, it may not be possible to grind the thread groove within the range of the finishing allowance, resulting in defective thread grooves and uneven grinding resistance applied to the female thread grind product or the grinding wheel for internal grinding during grinding. Therefore, there is a problem that high precision thread groove processing cannot be performed. Conventionally, after gripping the internal thread grind on the chuck of the machine, the internal thread grind is rotated, and the grinding wheel for internal polishing is reciprocated in the axial direction to align the two while visually or observing the occurrence of sparks. I was doing the screw groove alignment.

[0003]

[Problems to be solved by the device]

 Visual and manual thread grooving require a high degree of skill and require a lot of time for thread grooving. In particular, when finishing grinding a large number of female thread grinds, it is necessary to adjust the thread groove each time, and an extremely long setup time is required, resulting in a problem of lowering the machine operating rate. In addition, since it requires a high degree of skill, it was difficult for ordinary workers to produce stable, high-quality female thread grinds.

The present invention solves the above-mentioned problems, and without requiring a high degree of skill, screw groove alignment can be performed in a short setup time, the machine operating rate can be improved, and the quality of the product can be improved. It is an object of the present invention to provide a thread groove aligning structure for a large number of internal thread grinds capable of stabilizing and highly accurate thread groove processing.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a thread groove aligning structure for grinding and finishing the threads of a large number of internally threaded ground products of the same shape that have been pre-processed. A positive reference hole is provided during the pre-machining of the ridge, and a reference pin that fits into the reference hole is fixedly installed on the chuck side of the finishing grinding machine. To do.

[0006]

[Action]

 The pre-processing of the thread groove is performed by setting the reference hole preformed in the female thread grind product to be positive. During the finish grinding process, the reference pin that is fixed to the chuck side of the finish grinding machine is inserted into the reference hole of the female thread grind to position the chuck side and the female thread grind. In this state, the thread groove of the first internally threaded product and the grinding wheel for internal polishing are visually and manually positioned. For the second and subsequent female thread grinding products of the same shape, the thread groove alignment is performed automatically simply by fitting the reference hole into the reference pin and fixing it to the chuck. Therefore, special setup for thread groove alignment must be performed. Without it, you can proceed with the finishing grinding process.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show an example of the internal thread ground material 4. The female thread grind 4 comprises a flange 5 on the mounting side and a boss portion 6, and a thread groove 3 of a female screw is formed in the boss portion 6. Further, four mounting holes 7 are formed in the flange 5, and the reference hole 1 is formed therethrough. The reference hole 1 is pre-drilled at a fixed position on a large number of female thread grinds 4 having the same shape. After processing the flange 5 and the like of the female thread grind 4, the thread groove 3 is pre-processed by a thread groove processing machine (not shown). At the time of pre-processing, the reference hole 1 is fitted into a reference pin or the like provided on the chuck side of the processing machine to perform thread groove processing. As shown in FIG. 4, a finishing allowance 8 for finish grinding is left in the thread groove 3 of the pre-processed female thread grind 4. Further, the thread groove 3 is finish-ground by an inner grinding wheel 9 having the same outer peripheral shape.

FIG. 3 shows a schematic structure of a grinding machine for finish grinding an internally-threaded grinding product 4. The female thread grind 4 is detachably held by a chuck 28 as shown in FIG. The chuck 28 is fixed to the headstock 11 on the rotary shaft 12 side. On the bed 13 on which the headstock 11 is placed, a slide table 14 is slidably supported along the axial direction of the thread groove 3 of the female thread grind 4. On the slide table 14, a grindstone base 15 for rotatably supporting the grindstone 9 for internal polishing, a grindstone drive motor 16 and the like are fixed. The internal grinding wheel 9 is arranged at a position opposite to the internal thread grind 4. A gear 19 is fixed to the rotary shaft of a slide table driving servomotor 17 provided with a speed reducer 18. On the other hand, the gear 19 meshes with a gear 24 fixed to the feed screw shaft 23. The feed screw shaft 23 is supported at both ends by the bed 13 and is screwed to the female screw member 25 fixed to the slide table 14 side. A rotary shaft driving servomotor 20 installed on the headstock 11 drives the rotary shaft 12 via gears 21 and 22. When the slide table driving servomotor 17 and the rotary shaft driving servomotor 20 are synchronously operated by the above structure, the female thread grind 4 is rotated, and the slide table 14 and the grinding wheel 9 for internal polishing are synchronized with the rotation. Moves in the axial direction, and finish grinding of the thread groove 3 is performed.

FIG. 5 shows a schematic structure of the chuck 28. A chuck body 26 is fixed to the rotary shaft 12 pivotally supported by the headstock 11 (FIG. 3). A chuck claw 27 is supported on the chuck body 26 so as to be slidable in the radial direction (detailed structural description is omitted). The reference pin 2 projects and is fixed to the work topper 10. The reference pin 2 is fitted on the work stopper 10 side as shown in an enlarged view in FIG. The pin portion 30 is preferably subjected to a hardness increasing treatment in order to improve wear resistance.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, the female thread grind 4 after the blank processing and the processing of the reference hole 1 is attached to a processing machine for preprocessing the thread groove 3. In this case, the reference hole 1 is made positive (step 1). Next, the first and first of a large number of female thread grinds 4 having thread grooves pre-processed are attached to a chuck 28 of a machine for finish grinding. In this case, the reference hole 1 of the first female screw grind 4 is fitted into the reference pin 2 of the chuck 28 and fixed by the chuck claw 27 (step 101). Next, the grinding stone 9 for internal polishing, which is arranged at a position opposite to the internal thread grind 4, is engaged with the thread groove 3, and the thread groove is manually aligned by visual inspection or the like (step 102). The slide table drive servomotor 17 and the rotary shaft drive servomotor 20 shown in FIG. 3 are operated to rotate the internal thread grind 4 and reciprocally move the internal grinding wheel 9 along the axial direction to form a thread groove. The finish grinding process of 3 is performed (step 103). With the above, the grinding process of the first internally threaded product is completed. The grinding wheel 9 for internal polishing is retracted, the first female thread grind 4 is removed from the chuck 28, and the next second female thread grind 4 is attached to the chuck 28. In this case, the mounting and positioning work is completed only by fitting the reference hole 1 into the reference pin 2 and fixing it with the chuck claw 27 (step 104). That is, as described above, all the pre-processing of the female thread grind 4 is performed with the reference hole 1 being positive. Therefore, by inserting the reference hole 1 into the reference pin 2 of the chuck 28, the second female screw is inserted. The grind 4 is set at the same relative position with respect to the internal grinding wheel 9 as in the first female thread grind 4. Therefore, it is not necessary to align the second internal thread grind 4 with the internal grinding grindstone 9 in the thread groove. Next, the slide table driving servomotor 17 and the rotary shaft driving servomotor 20 are actuated in the same manner as described above, and the internal grinding wheel 9 is advanced to move the screw groove 3 of the second female thread grind 4 into Finish grinding is performed (step 105). After the grinding of the second female thread grind 4 is completed (step 106), the next work is loaded by the same setup work as described above (step 107), and the same work is repeated. As described above, in the case of this embodiment, after the thread groove alignment of the first female thread grind 4 is performed manually, the thread groove is formed by only inserting the reference pin 2 into the reference hole 1. The alignment is reliable and complete.

In the present embodiment, the shape of the female thread grind 4 is as shown in FIGS. 1 and 2, but the work shape is not limited to that. Further, although the reference hole 1 is different from the mounting hole 7, one of the mounting holes 7 may of course be used. Further, the shapes of the reference hole 1 and the reference pin 2 are not limited to those of this embodiment.

[0012]

[Effect of device]

 According to the present invention, the following effects can be obtained. (1) The setup time can be greatly reduced because the screw groove can be aligned by a simple means such as fitting the reference hole for the female thread grind into the reference pin. Therefore, the machine operating rate is improved. (2) Since the screw groove can be accurately aligned, highly accurate screw grinding can be performed. (3) Since no skill is required, ordinary workers can perform thread grinding. (4) It has a relatively simple structure and can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is a front view of an internally threaded product applied to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view for explaining a schematic structure of a machine for performing finish grinding.

FIG. 4 is an enlarged partial cross-sectional view of a preprocessed thread groove.

FIG. 5 is a schematic view of a chuck for gripping an internally-threaded object.

FIG. 6 is an enlarged partial sectional view for explaining a thread groove aligning means of the present embodiment.

FIG. 7 is a flow chart for explaining the operation of the present embodiment.

[Explanation of symbols]

 1 Reference Hole 2 Reference Pin 3 Thread Groove 4 Female Thread Grinding 5 Flange 6 Boss 7 Mounting Hole 8 Finishing Allowance 9 Grinding Stone for Internal Grinding 10 Work Stopper 11 Spindle Head 12 Spindle 13 Bed 14 Slide Table 15 Grindstone Stand 16 Grindstone Drive Motor 17 Slide table driving servo motor 18 Reduction gear 19 Gear 20 Rotary shaft driving servo motor 21 Gear 22 Gear 23 Feed screw shaft 24 Gear 25 Female screw member 26 Chuck body 27 Chuck claw 28 Chuck

Claims (1)

[Scope of utility model registration request] 1. In a screw groove alignment structure for grinding and finishing the threads of a large number of internally threaded products of the same shape that have undergone preprocessing, the mounting side of the internally threaded products is positive when the threads are preprocessed. And a reference pin that fits into the reference hole is fixedly provided on the chuck side of the finish grinding machine.