JPS6333964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for connecting and grinding long screws.

Generally, when grinding a long screw with a thread grinder, joint grinding may be performed. this is,
This is a method that does not grind long screws all at once, but sequentially grinds them at fixed lengths. In this case, at the connection of each thread-ground section,
The issue is whether the thread grooves are accurately continuous and the pitch is kept constant. Conventionally, this thread alignment work has relied on the intuition of experienced workers, and when grinding a new section, the grinding wheel is gently brought close to the thread at the end of the previous section that has already been ground, and the level of spark generation is measured. Methods such as adjusting the position while looking at the grinding wheel, or approaching the threaded portion many times without rotating the whetstone and determining the position with the naked eye have been used. All of these conventional methods have drawbacks in terms of accuracy and cause a decrease in work efficiency.

The present invention has been made to solve the above-mentioned conventional problems, and is a method for joint grinding of long screws, which enables accurate positioning in joint grinding, facilitates operation, and significantly improves work efficiency. and its equipment. In order to achieve this object, the present invention uses a displacement measuring tool with a simple configuration, accurately measures the displacement of a threaded rod with this measuring tool, and aligns the threaded rod based on this measurement value. It has been made possible.

Hereinafter, the present invention will be specifically explained with reference to the illustrated embodiment. Reference numeral 1 denotes a long threaded rod, one end of which is gripped and fixed by a headstock 2, and the other end of which is held by a tailstock center 3. Supported by. Reference numeral 4 denotes a grinding wheel, which is attached to a grindstone stand 5 and is capable of grinding a thread along the threaded rod 1 by a certain length L. 6 is a displacement measuring tool;
Its configuration will be detailed later, but it includes a spherical contact 7 that fits into the thread groove 1a, and this contact 7 is attached to one end, and the displacement of the screw in the longitudinal direction by this contact is expanded to the other end. The arm member 9 is pivotally supported by a pin 8 in order to transmit the information, and the instrument 10 is engaged with a measuring element 10a at the other end of the arm member and measures the expanded displacement through this measuring element. It is included as a member. This displacement measuring tool 6 is attached to the grindstone head 5.

As described above, once the thread has been ground by a certain length L by the grindstone 4, the grinding is temporarily stopped and the threaded rod 1 is moved to the left in the figure. At this time, the ground portion is inserted into the headstock 2 and fixed, but the ground end of the screw remains for position adjustment. Correct positioning of the threaded rod 1 can be achieved by fitting the contact 7 of the displacement-side fixture 6 into the thread groove 1a at the end of this screw. That is, if the connecting position of the threaded rod 1 is correct, the meter 10 will display the zero position, but if the connecting position is shifted by a displacement δ as shown in FIG. The display position of is now shifted. Therefore, if the position of the threaded rod 1 is adjusted until the pointer of the meter 10 reaches the zero position, the position will be determined correctly.

Next, an embodiment of the displacement measuring device 6 is shown in FIG.
It is pivoted to 1. The instrument 10 has a mounting fixture 12
It is attached to the movable member 11 via the contact point 10a thereof, and its probe 10a is engaged with the end of the arm member 9. In this case, since the distance from the pin 8 to the engagement point of the probe 10a is set larger than the distance between the pin 8 and the contact 7, the displacement of the threaded rod 1 by the contact 7 is magnified and the meter 10.
13 is a return spring installed between the end of the arm member 9 and the moving member 11. Reference numeral 14 denotes a pedestal that constitutes a support member together with the moving member 11, and is provided with a pair of guide rods 15.
The moving member 11 is fitted into the guide bar so that it can move along the guide rod, and the moving member 11
A spring 16 is installed between the cradle 14 and the pedestal 14.
17 is a support fixed to the grinding wheel head 5;
A dovetail groove 17a is formed, into which the pedestal 14 of the support member is slidably fitted, so that the support member can be moved on the support pedestal 17. Therefore, by moving the support member, the displacement measuring tool 6 can be positioned at a desired position for threaded rods of various diameters. Reference numeral 18 denotes a stopper member, which is pressed onto the pedestal 14 by tightening a bolt 19 so that the position of the pedestal 14 can be held and fixed. Then, the displacement of the threaded rod is measured by inserting the contact 7 into the groove of the already ground screw as described above, but at this time, the contact 7 is moved into the thread groove by the action of the spring 16 and the return spring 13. The displacement can be measured accurately and quickly.

As is clear from the above description, since the present invention grinds the thread after correctly positioning the threaded rod using a displacement measuring device, the pitch of the thread can be accurately maintained at the connection part during continuous grinding. , it is possible to provide long screws with high precision. Furthermore, the displacement measuring instrument according to the present invention has a simple structure and is easy to operate, allowing efficient positioning of the threaded rod.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the method of the present invention;
Fig. 2 is an explanatory diagram showing the state of displacement measurement of a threaded rod by a contactor, Fig. 3 is a plan view of the displacement measuring instrument according to the present invention, Fig. 4 is a front view, and Fig. 5 is a partially broken side view. It is a diagram. DESCRIPTION OF SYMBOLS 1... Threaded rod, 1a... Thread groove, 2... Headstock, 3... Tailstock center, 4... Grindstone, 5... Grindstone head, 6... Displacement measuring tool, 7... Contact, 8...
Pin, 9... Arm member, 10... Instrument, 10a
...Measuring point, 11...Moving member, 12...Mounting tool, 13...Returning spring, 14...Base, 15...
Guide rod, 16... Spring, 17... Support stand, 18
...stopper member, 19...bolt.

Claims (1)

[Scope of Claims] 1. After grinding the thread along the threaded rod by a certain length, the threaded rod is moved and the next thread grinding is repeated continuously to the end of the thread that has been thread-ground. In the joint grinding method for long screws, a measuring tool for detecting longitudinal displacement of the threaded rod is engaged with the end of the screw, and the threaded rod is set at a predetermined position based on the displacement measurement value. A method for joint grinding of long screws, characterized by grinding the screws from scratch. 2. A contact that fits into the groove of the ground screw, and this contact is attached to one end and is pivoted with a pin so that the displacement in the length direction of the screw by this contact is expanded and transmitted to the other end. an arm member, a measuring device that engages a measuring point on the other end side of the arm member and measures the expanded displacement via the measuring point, and a supporting member to which the measuring device and the arm member are attached. A connecting grinding device for long screws, characterized by being equipped with a displacement measuring tool consisting of: