JPH0417322Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a burnishing tool suitable for accurately burnishing cutting surfaces in mechanical work, especially the inner diameter surfaces of small-diameter through holes.

[Prior Art] Conventionally, there are cases where a rough cut surface in mechanical work is subjected to burnishing in order to have a smooth finished surface.
Burnishing has the advantage of creating highly accurate finished surfaces in a short time using relatively simple tools, and also increasing the surface hardness of the finished surfaces.

A conventional example of burnishing is ball-through finishing, in which a steel ball corresponding to the finished inside diameter is passed through a long and narrow through-hole that has been drilled or reamed in order to burnish the inside surface of the hole. ing. However, since this ball-through finishing uses steel balls, the finishing targets were holes made of relatively soft materials such as aluminum and brass. To finish iron materials, the burnishing ball requires a harder material such as diamond, but diamond is difficult to process into a perfect sphere and is also expensive, so it is difficult to make a burnishing ball that matches the required diameter. There were so many problems that it was not economical to prepare a large number of diamond balls. Another burnishing method is to use a reamer-like tool to provide a burnishing press on the opposite side of the reamer blade, and apply the cutting stress of the reamer blade to the burnishing press on the opposite side to burnish a small hole. There was a drawback that chips from the reamer blade damaged the burnished surface. In addition, there is a method in which a burnishing ball presser is pressed perpendicularly to the finished surface, such as with a cutting tool on a lathe, but it is difficult to finish small inner diameters.

Another problem with burnishing is that burnishing is a finishing method that presses the burnishing press surface against the finished surface to smooth out unevenness caused by cutting, so the burnishing tool wears out more than tools used in other machining methods. Tools must be easy to change. Making this tool change easy is also important for increasing the operating efficiency of the burnishing machine tool.

[Problems to be solved by the invention] The purpose of this invention is to provide a burnishing bit that can be used regardless of the diameter, is capable of burnishing relatively small holes, and is easy and quick to replace. do.

[Means and effects for solving the problem] It has an insertion hole with an opening and a bottom formed in the depth direction, and a cylindrical pin provided in a horizontal direction perpendicular to the depth direction, and the cylindrical pin A holder arranged so that the upper side surface is exposed in the insertion hole, and a holder that is held in the insertion hole of this holder so that it can slide inside the insertion hole and the front part protrudes from the opening. , an accommodation groove whose upper side is open is provided in the upper part along the depth direction, a regulation groove provided below the accommodation groove to accommodate a pin for regulating the sliding range, and a rear end of this regulation groove. When an arbor is provided with a ball hole penetrating the accommodation groove on the side and a spherical arbor is housed in a space between the rear end side of the regulation groove of the arbor and the pin, and the rear end is pressed toward the pin side. A locking ball that slides on the upper surface of the cylindrical side surface of the pin and is lifted into the ball hole, a spring that is provided between the bottom of the holder and the arbor and constantly presses the arbor toward the opening of the holder, and has elasticity. It is made of material and is formed so that it can be inserted into the housing groove of the arbor, and has a protruding vanishing ball pusher made of a highly hard material at its tip, a locking recess at the other end, and a locking recess from the other end. The present invention is characterized by comprising a vanishing bar that is locked to the holder by the locking ball being inserted into the locking recess through the ball hole by the pressing force of the spring when inserted into the housing groove of the arbor.

With the burnishing tool configured in this way, for example, when burnishing a cylindrical inner diameter surface, the burnishing ball presser is pressed against the inner diameter surface using the elastic force of the burnishing bar, and either the burnishing bar or the object to be finished is finished. The feed is performed while rotating around the center of the inner diameter. With such a processing method, the rough cut surface of the inner diameter surface of the object to be finished can be processed into a smooth finished surface by the burnishing ball presser strongly pressed by the elastic force of the burnishing bar.

When replacing the vanishing bar, the locking ball pressed by the tension of the coil spring fits into the locking recess of the vanishing bar and is fixed in place, so the arbor is fixed against the tension of the coil spring. If it is pushed into the holder from the outside, the locking by the locking ball is released and it can be replaced easily and quickly.

[Embodiment] An embodiment of this invention will be described below with reference to the drawings. FIG. 1A is a side cross-sectional view of the vanishuvite of this embodiment, and FIG. 1B is a cross-sectional view. Reference numeral 1 denotes a prismatic burnishing bar made of an elastic material such as cemented carbide, and a protruding burnishing ball pusher 2 made of a highly hard material such as diamond is soldered to the tip thereof. One other end is provided with a taper 1a to facilitate insertion, and a locking recess 1b for fixing the vanishing bar 1 is provided near the taper 1a. This vanishing bar 1 is inserted into the accommodation groove 3a of the arbor 3, and inserted into the insertion hole 4a of the holder 4 together with the arbor 3.
is slidably held against the In order to regulate this sliding range, a regulating groove 3b is fixed to the arbor 3, and a cylindrical pin 6 is fixed to the holder 4 perpendicularly to the side surface, and the upper part of the cylindrical side surface is fixed to the regulating groove 3b. It is installed to fit into the groove. A ball hole 3c penetrating into the accommodation groove 3a is provided at the left end of the regulation groove 3b in the drawing, and a locking ball 5 for locking the vanishing bar 1 is accommodated in the regulation groove 3b. The position of the pin 6 is set so that the locking ball 5 is accommodated between the pin 6 and the left end in the figure where the ball hole 3c is provided. A coil spring 7 is provided between the bottom 4b of the insertion hole 4a of the holder 4 and the arbor via a receiving ball 8, and this coil spring 7 always pushes the arbor 3 to the right side in the figure by the tension of the spring. It works like this. Due to this stretching force, the locking ball 5 is pressed along the cylindrical surface of the pin 6 and fits into the locking recess 1b of the vanishing bar 1.
Lock and fix the burnish bar 1. The tension force of the coil spring 7 can be adjusted by adjusting the length of the coil spring 7 with a screw (not shown) inserted into the screw hole 9. When replacing the vanishing bar 1, push the arbor 3 from the outside to the left in the figure against the tension of the coil spring 7. The arbor 3 slides inside the insertion hole 4a, so the left end of the regulating groove 3b and the pin A space is created between the pin 6 and the locking ball 5, and the upward pressing force exerted on the locking ball 5 by the pin 6 is eliminated.
Since the locking ball 5 falls into this space, the locking ball 5 and the locking recess 1b of the vanishing bar 1 are disengaged from each other. In this state, the burnish bar 1 can be replaced by pulling it toward the right side in the figure. When installing the burnish bar 1 again, the burnish bar 1 can be easily installed by inserting the burnish bar 1 along the accommodation groove 3a of the arbor 3 and pressing down the locking ball 5 whose taper 1a projects into the accommodation groove 3a.

FIG. 2 is an explanatory diagram of the case where the inner diameter surface is burnished using the burnishing bit of the same embodiment.
When finishing the inner diameter surface, feeding is performed while rotating either the object to be finished 10 or the burnishing tool 11 about the center of the inner diameter of the object to be finished 10. With this finishing method, the burnishing ball presser 2 is pressed against the inner diameter surface 10a by the elastic force of the burnishing bar 1, thereby making it possible to perform burnishing. This finishing method can process the inner diameter as long as it is larger than the size that allows the burnishing ball presser 2 and the burnishing bar 1 to enter the inner diameter of the object 10 to be finished. In this example, a prototype with an inner diameter of 4 mm was manufactured.

FIG. 3 shows an embodiment of the vanishing ball depressor 2. The vanishing ball depressor 2 is made of diamond with a substantially spherical tip and a taper angle of approximately 70°. It is brazed at an angle of 30° to 45° depending on the application.
In the case where the finishing hole of the object 10 to be finished has a bottom as shown in FIG. 2, and this bottom is also to be burnished, one installed at an angle of about 45° is used. In the case of finishing the bottom part, the coil spring 7 acts as a buffer to prevent damage to the burnishing ball presser 2.

Nahoko's invention is not limited to the above embodiments, but can be implemented with various modifications without changing the gist.

For example, the material of the burnishing ball presser 2 is not limited to diamond, but may also be made of cemented carbide, high-speed tool steel, etc. in the case of a workpiece with low hardness such as aluminum.

[Effects of the invention] The burnishing tool of this invention is economical because it can be commonly used regardless of the size of the inner diameter of the object to be finished, and is especially effective on small inner diameter surfaces, which was difficult with conventional burnishing tools of this type. Finishing has become easier. With this burnishing bit, it is possible not only to finish the inner diameter surface described in the above example, but also to burnish the outer diameter surface of a cylindrical shape or a flat surface using the same processing method, and it can also be used for deburring. It can also be used for chamfering.

Another advantage of this invention is that the vanishing bar can be easily and quickly replaced.

Easy replacement is an important requirement for burnishing tools, and greatly contributes to increasing the operating efficiency of burnishing machine tools.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the burnishing bit according to this invention, FIG. 2 is an explanatory view of the burnishing process of the inner diameter surface using the burnishing bit, and FIG. 3 is an enlarged side view of the burnishing ball presser. 1... Vanish bar, 1a... Taper, 1b
... Locking recess, 2 ... Vanishing ball presser, 3 ...
Arbor, 3a...Accommodation groove, 3b...Regulation groove, 3
c... Ball hole, 4... Holder, 4a... Insertion hole, 4b... Bottom, 5... Locking ball, 6...
Pin, 7...coil spring, 8...receiving ball, 9...screw hole.

Claims (1)

[Claims for Utility Model Registration] (1) It has an insertion hole with an opening and a bottom formed in the depth direction, and also has a cylindrical pin installed in the horizontal direction perpendicular to the depth direction,
A holder arranged so that the upper part of the cylindrical side surface is exposed in the insertion hole, and a holder that is slidable in the insertion hole of the holder and whose front part projects from the opening. A housing groove is provided in the upper part along the depth direction and the upper side is open, and a regulating groove is provided below the housing groove to contain the pin in order to regulate the sliding range. an arbor provided with a ball hole penetrating the accommodation groove on the back end side of the regulation groove; A locking ball that slides on the upper surface of the pin cylindrical side surface when pressed to the pin side and is lifted into the ball hole, and a locking ball that is provided between the bottom of the holder and the arbor so that the arbor is always directed in the opening direction of the holder. It is made of a pressing spring and an elastic material, and is formed so that it can be inserted into the housing groove of the arbor, and a protruding vanishing ball presser made of a highly hard material is attached to the tip of the spring and the other end is engaged. A stop recess is provided,
and a vanishing bar that, when inserted into the housing groove of the arbor from the other end side, is locked to the holder by the pressing force of the spring causing the locking ball to fit into the locking recess through the ball hole. Vanishyubite is characterized by the fact that it did. (2) The vanishing guide according to claim 1, wherein the material of the vanishing ball presser is diamond.