JPH0711220U - Throw-away type rolling tool - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rolling tool equipped with a tip clamp mechanism, which has excellent insertability of throw-away inserts, excellent durability, and is not subject to size restrictions. [Structure] The input shaft 11 and the disc spring 12 are assembled in the first shaft hole 4 of the tool body 1. Further, the clamp shaft 13 is inserted into the second shaft hole 5, the slanting piece 14 is fitted to the shaft portion 13c penetrating the elongated hole 11a of the input shaft, and the slanted front surface 14a of this piece is fitted to the cam surface 11b provided on the input shaft. Contact. The position of the tilting piece 14 is adjusted by the adjusting nut 15 and the lock nut 16.
The clamp shaft is biased by the coil spring 12 in the unclamping direction. According to this structure, the size of the clamp mechanism in the tool axis direction is reduced. In addition, the force transmission from the input shaft to the clamp shaft becomes accurate, and the contact area between the surfaces 14a and 11b can be increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a throw-away type cutting tool in which a clamp mechanism for a throw-away insert is improved to improve insert exchangeability and durability of the clamp mechanism.

[0002]

[Prior art]

 The throw-away tip clamping mechanism used in cutting tools is generally designed so that a wedge-type presser foot is pulled into the wedge groove by the thrust of a screw to clamp the tip, but this type of clamping mechanism uses one tip. Since the replacement time per hit is long, it is not suitable for multi-flute high efficiency machining cutting tools.

Therefore, Japanese Patent Publication No. 47-42587 and Japanese Utility Model Publication No. 62-184917 propose a clamping mechanism in which a spring is used to generate a clamping force so that the tip can be replaced without screw operation. In the clamp mechanism shown in the former publication, a clamp shaft composed of a wedge-shaped device and a pull rod is directly pulled by a spring to a clamp point, and an unclamp pushes down a clamp shaft protruding on the back surface of the tool body with a lever.

On the other hand, in the latter publication, the insertion / removal shaft biased by a spring is key-fitted to a clamp shaft (wedge shaft), and the thrust force of the insertion / removal shaft is changed in direction by the key fitting portion. Pull in the clamp shaft by transmitting it to the clamp shaft. In addition, the tip clamp is released by applying a pushing force from the outside to the end of the insertion / removal shaft protruding to the back of the tool body.

[0005]

[Problems to be solved by the device]

 In the clamp mechanism disclosed in Japanese Patent Publication No. 47-42587, the spring for generating the clamping force is fitted on the outer circumference of the clamp shaft, so that the dimension of the clamp mechanism in the axial direction of the clamp becomes long and the height of the cutter ( When the thickness is limited, for example, it is difficult to adopt it in a two-piece type cutter configured by combining a ring-shaped main body and an adapter.

Further, in the clamp mechanism of Japanese Utility Model Laid-Open No. 62-184917, since the clamp shaft and the insertion / removal shaft are key-fitted at the outer peripheral portion deviated from the shaft center, force transmission loss easily occurs. Further, since the size of the key fitting portion is inevitably small, the load bearing of the surface for transmitting the force is large and there is a problem in durability. Furthermore, since the unclamping operation section is on the back side of the main body, that is, the mounting surface side to the adapter, a dedicated adapter having a receiving groove for the unclamping operation section is also required.

An object of the present invention is to eliminate these problems and improve the insert replaceability of a rolling tool, and to improve the stability of the clamp and the durability of the clamp mechanism.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the rolling tool of the present invention is provided with a throw-away tip clamping mechanism to be assembled to the tool body, which has a head having a clamping surface with a wedge angle and a shaft having a diameter smaller than that of the head. Of the small-diameter shaft portion, an elongated hole through which the small-diameter shaft portion of the clamp shaft penetrates, and an input shaft equipped with a cam surface inclined downward toward the operation end side at the outlet side of the hole, and the input of the small-diameter shaft portion. A tilt piece that fits over the shaft penetrating portion so that the slope at the lower end contacts the cam surface, a nut that is screwed into the male screw to adjust the retracted position of the tilt piece, and a clamping force that pushes the input shaft in one direction. The first urging means for generating and the second urging means for pushing the clamp shaft in the unclamping direction with a force weaker than the first urging means are provided. Also, the input shaft penetrates the first shaft hole opened on the outer periphery of the tool main body, and the clamp shaft penetrates the wedge groove adjacent to the tip support seat to the back surface, and is made orthogonal to the first shaft hole. Is slidably inserted into the second shaft holes provided in the tool body, and the clamp shaft is pulled into the clamp point by the force of the first biasing means at the position where the operating end of the input shaft projects to the outer periphery of the tool body. To

[0009]

[Action]

 Since the force of the first biasing means is applied to the input shaft and transmitted from there to the clamp shaft orthogonal to the input shaft, the size of the clamp mechanism in the cutter axial direction can be greatly reduced.

Further, since the clamp shaft is passed through the input shaft, a large contact area between both shafts can be secured, and the force is transmitted with reference to the shaft centers of both shafts, and the force of the first urging means is increased. Is accurately transmitted to the clamp shaft in a well-balanced manner.

Furthermore, since the operating end of the input shaft is arranged on the outer circumference of the tool body, a dedicated adapter is not required. In addition, there is no restriction on the operation in terms of space, and tip replacement on the machine is also allowed.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

1 is a body of a rolling tool, 2 is a tip support seat provided on the outer peripheral portion of the front end of the main body, 3 is a wedge groove provided on the main body adjacent to the 2 seat, and 4 is a center from the outer peripheral portion of the main body. A first shaft hole machined toward the side, 5 is a second shaft hole penetrating from the wedge groove 3 to the rear surface of the main body, 6 is a throw-away tip, and 10 is a clamp mechanism for fixing the tip 6.

The clamp mechanism 10 includes an input shaft 11 slidably inserted into the first shaft hole 4, a disc spring 12 biasing the shaft in a direction projecting from the hole 4, and a second shaft hole 5 slidable. It consists of a clamp shaft 13 to be inserted into itself, a tilting piece 14 mounted on this clamp shaft, an adjusting nut 15, a lock nut 16 and a coil spring 17.

The clamp shaft 13 is shaped to include a head portion 13b having a clamp surface 13a having a wedge angle θ (see FIG. 3) and a shaft portion 13c having a diameter smaller than that of the head portion 13b. A male screw is machined at the end of the small diameter shaft portion 13c.

Further, the input shaft 11 is a stepped shaft whose diameter changes from the middle, and has a structure in which a long hole 11a is provided in the central portion on the large diameter side and a cam surface 11b that is inclined downward toward the operation end side. I am doing it. The small-diameter portion of the input shaft is preferable in terms of the assemblability of the disc spring 12 and the sliding stability of the input shaft 11, but is not an essential element. Further, in order to protect the sliding surface, it is desirable to seal the inlet of the first shaft hole 4 with an O-ring 18.

The front surface 14 a of the tilting piece 14 is tilted so as to correspond to the cam surface 11 b, the disc spring 12 and the input shaft 11 are inserted into the first shaft hole 4, and then the clamp shaft is inserted into the second shaft hole 5. After inserting 13, the tilting piece 14 is fitted on the shaft portion 13c of the clamp shaft that penetrates the elongated hole 11a. Then, adjust nut 15 is screwed onto the male thread at the end of shaft 13c, and a model chip with a small thickness considering the tightening margin is set on chip support seat 2 and the clamp surface of the clamp shaft is in close contact with the model chip. Tighten the adjustment nut 15 to the point where it is locked, and fix the adjustment position with the lock nut 16.

The coil spring 17 is provided for the purpose of pushing the clamp shaft 13 to the unlock point when unlocked, and its spring force is sufficiently smaller than the force of the disc spring 12.

In the clamp mechanism configured as described above, when the operating end of the input shaft 11 protruding to the outer periphery of the main body is pushed against the force of the disc spring 12, the clamp is released and the chip is removed. When the pushing of the input shaft is released, the force of the disc spring 12 pulls the clamp shaft 13 to the clamp point to fix the chip.

To replace the tip, set the tool body in the jig and make sure that the input shaft is pushed into the cam plate or cam rod by the relative rotation with the cam plate or cam rod that is immovable in the radial direction of the tool. If you do this, the work will be easier. The same work can be performed while setting the tool on the machine.

If it is inconvenient for the operating end of the input shaft 11 to project to the outer periphery of the tool body, as shown in FIG. It is advisable to have a structure that projects to the outer periphery.

[0022]

[Effect of device]

 As described above, since the rolling tool of the present invention can greatly reduce the tool axial dimension of the tip clamp mechanism, it is easy to operate even for a two-piece type rolling tool with a thin body. It is possible to improve the chip exchangeability by adopting a simple clamp mechanism.

Further, since the force is transmitted from the input shaft to the clamp shaft with reference to the shaft center, the clamp force is accurately transmitted, the stability of the clamp is improved, and a wide force transmission surface is secured. As a result, wear and fatigue of parts are reduced and durability is improved.

Furthermore, since the operating end of the input shaft is on the outer peripheral portion of the tool body, a dedicated adapter is not required, and tip replacement on the machine can be performed without any space limitation.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a tool of the present invention.

FIG. 2 is an exploded perspective view showing components of a clamp mechanism.

FIG. 3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a sectional view showing a main part of another embodiment.

[Explanation of symbols]

 1 Tool Main Body 2 Tip Support Seat 3 Wedge Groove 4 First Shaft Hole 5 Second Shaft Hole 6 Throwaway Tip 10 Clamping Mechanism 11 Input Shaft 11a Long Hole 11b Cam Surface 12 Disc Spring 13a Clamping Surface 14 Inclining Piece 15 Adjustment Nut 16 Lock Nut 17 coil spring

Claims (1)

[Scope of utility model registration request] 1. A clamp mechanism for a throw-away tip to be assembled to a tool main body, comprising: a head having a clamp surface with a wedge angle and a shaft having a smaller diameter than the head; and a small diameter of the clamp shaft. An input shaft having a long hole for penetrating the shaft portion and a cam surface that is inclined downward toward the operation end side on the outlet side of the hole, and an inclined surface at the lower end by being fitted onto the input shaft penetrating portion of the small diameter shaft portion. A tilting piece that comes into contact with the cam surface, an adjusting nut that is screwed onto the male screw and abuts against the upper end of the tilting piece, first biasing means that pushes out the input shaft from a later-described first shaft hole, and this first biasing means. A second urging means for pushing the clamp shaft in the unclamping direction with a weaker force is provided, and the clamp shaft is inserted into the first shaft hole opened to the outer periphery of the tool main body, and the clamp shaft is attached to the tip support seat. From the wedge groove adjacent to The clamp at a position where the operating end of the input shaft projects to the outer periphery of the tool body by being slidably inserted into the second shaft holes provided in the tool body so as to pass through each other and orthogonal to the first shaft hole. A throw-away type rolling tool in which the shaft is pulled to the clamp point by the force of the first urging means.