JPH0112925Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a knock-pushing tool, which is configured to be detachable from the spindle head of a machine tool so that it can be used particularly in a complex production system, and which is different from conventional cutting tools. This invention relates to a knock-pushing tool that can be used interchangeably.

[Technical background of the invention and its problems]

Generally, tool-changeable machine tools are used by attaching and detaching various cutting tools to a spindle head, so that a single machine tool can perform various cutting operations.

On the other hand, in recent years, complex production systems have been developed in which multiple machine tools are appropriately arranged and used to continuously hold, cut, and assemble workpieces. In this multi-production system, one machine tool is required to perform many different work functions such as cutting, assembly, and cleaning, so unlike in the past, only cutting tools and a small number of cutting auxiliary tools such as grease injection can be used interchangeably. Machine tools are functionally insufficient,
It is also necessary to be able to attach assembly tools, disassembly tools, cleaning tools, etc. to the spindle head.

[Purpose of invention]

Among various tools that are required to be attached to and removed from the spindle head of a machine tool used in the above-mentioned complex production system, the present invention aims to provide a knock pushing tool for pushing a knock pin for workpiece assembly into a workpiece. do.

[Summary of the idea]

In order to achieve the above object, the knock pushing tool of the present invention is characterized in that one end side of the knock pushing rod is held in a tool holder that can be attached to and detached from the spindle head of a machine tool. At the same time, when the tool is installed, a dowel pin housed in the parts supply tool and placed at a predetermined position in front of the workpiece can be pushed into the workpiece side.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, the knock pushing tool according to the present invention includes a tool holder 1 attached to the spindle side of a machine tool, and a tool holder 1 attached to the tool holder 1 via a holder 2 so as to protrude forward. It consists of a slender push rod 3.

The tool holder 1 is no different from the conventional tool holder, and its tapered shank portion 4 is inserted and fitted into a tapered hole formed at the tip of a spindle of a machine tool. A pull stud 5 provided at the rear end of the tapered shank portion 4 is gripped by a machine tool. Although the shank portion is formed in a tapered shape in this embodiment, it is of course possible to adopt a straight portion. If a straight shank part is used, the spindle tip of the machine tool should also be formed into a straight hole.

The holder 2 also includes a bottomed cylindrical housing 6 with an open front end and a closed rear end, and a solid cylindrical connecting portion that connects the bottom of the rear end of the housing 6 to the front end surface of the tool holder 1. It consists of 7.
The axes of the housing 6 and the connecting portion 7 are arranged to coincide with the axis of the tool holder 1, and these three members 1, 6, and 7 are integrally formed. Further, a lid 8 that closes the opening at the front end of the housing 6 is fastened and fixed with a plurality of bolts 9.

Furthermore, a receiving hole 12 that opens into the internal space 11 of the housing 6 is bored at the bottom of the inner rear end of the housing 6 . This receiving hole 12 has a predetermined depth and is arranged so that its axis coincides with the axes of the housing 6 and the connecting portion 7.

A rear end portion of the elongated knock push rod 3 is fitted into the receiving hole 12 via a slide bearing 14 so as to be able to reciprocate. This push rod 3
is provided so as to extend forward on the axis of the housing 6, passes through a receiving hole 15 formed through the central portion of the lid 8, and further protrudes forward from the lid 8 by a predetermined length. . A sliding bearing 16 is inserted between the receiving hole 15 and the knock push rod 3, and the knock push rod 3 is held so as to be able to reciprocate.

Furthermore, a disk-shaped collar portion 17 is provided approximately at the center of the knock push rod 3, and this collar portion 17 is configured to reciprocate integrally with the knock push rod 3 within the internal space 11 of the housing 6. It is located in By the flange 17 coming into contact with the rear side of the lid 8, the knob push rod 3 is restricted from moving further forward.
Further, the rearward movement of the knock push rod 3 is restricted by the rear end surface of the knock push rod 3 coming into contact with the bottom surface of the receiving hole 12, or by the disc springs 18 (described later) coming into close contact with each other. There is.

Further, between the collar 17 of the knock push rod 3 and the bottom of the rear end of the housing 6, a disc spring 18 is installed in a compressed state in multiple stages, thereby causing the push rod 3 to move forward. Forced to the side. Therefore, when the push rod 3 is left alone, the collar 17 is in contact with the rear surface of the lid 8.

A knock pushing tool with such a configuration can be attached to and removed from the spindle head of a machine tool, and when attached, it is moved forward and backward as the machine tool moves forward and backward, and the knock pin can be pushed into the workpiece. can.

That is, as shown in FIG. 2, the knock pushing machine tool 20 equipped with the knock pushing tool according to the present invention is used with the work holding machine tool 22 holding the workpiece 21 facing each other, and furthermore, both machine tools A parts supply machine tool 24 equipped with a knock pin supply tool 23 is disposed between the parts 20 and 22 to constitute a complex production system. In such a complex production system, first, a dowel pin is inserted into the dowel pin supply tool 23, and then the dowel pin supply tool 23 into which the dowel pin has been inserted is mounted on the parts supply machine tool 24, and then this part supply machine tool 24 is installed. The knock pin supply tool 23 is placed in front of the workpiece 21 by moving the dowel pin supply tool 23 appropriately, and the dowel pin supply tool 23 is placed in front of the workpiece 21.
Position it immediately in front of the insertion hole position on the first side. and,
The knock pushing machine tool 20 is moved appropriately to position the knock pushing rod 3 just in front of the knock pin. In this state, when the knock pushing machine tool 20 is advanced and the knock pin is pressed by the knock pushing rod 3,
The above-mentioned dowel pin is pushed out from the dowel pin supply tool 23 and inserted into the insertion hole of the workpiece 21. As a result, the workpieces are assembled.

In this case, if a malfunction occurs and the knock pushing tool and the knock pin supply tool 23 are not positioned accurately and the knock pushing tool collides with the main body of the machine tool, the knock pushing rod 3 will retreat in the axial direction. It is designed to absorb impact force and prevent damage to machine tools. moreover,
When the knock pushing machine tool 20 is moved backward from this state, the knock pushing rod 3, which is urged forward by the disc spring 18, protrudes forward again and returns to its original state.

Good results can be obtained by setting the biasing force of the disc spring 18 within a certain range. That is, when pushing in the dowel pin, a certain pushing force W ₁ is required, but the disc spring 18 is compressed to a certain amount or more so that the elastic force W ₀ of the disc spring 18 becomes greater than the pin pushing force W ₁ . If you install it with the lock in place, you can prevent the knock push rod 3 from retreating when pushing it in.
The amount and speed of push-in of the dowel pin can be adjusted accurately.

On the other hand, when the knock push rod 3 collides with the main body of a machine tool as described above, it is necessary to retreat the knock push rod 3 before the collided side of the machine tool etc. is damaged. The generated force W ₀ needs to be smaller than the rigidity force W ₂ on the collided side.
Furthermore, it is conceivable that the machine tool 20 will continue to move forward for a short period of time even after a collision occurs, but in this case, the knock push rod 3 will be pushed in and the disc spring 18 will be compressed, and by that amount. Belleville spring 18
This results in an increase in the elasticity of the ball. Therefore, the maximum movement amount of the push rod 13 is S, and the spring constant is k.
Then, the maximum elastic force of the disc spring 18 (W ₀ +Ks)
Safe work can be ensured by setting the value of W2 to be smaller than the rigidity _W2 of the collided side.

[Effect of idea]

As mentioned above, the knock pushing tool according to the present invention has one end of the knock pushing rod held in a tool holder that can be attached to and removed from the spindle head of a machine tool, so it can be used in tool-changeable machine tools together with conventional cutting tools. The dowel pin, which has been conveyed and placed at a predetermined position in front of the workpiece by the assembly parts supply device, can be pushed into the insertion hole on the workpiece side. Therefore, according to the present invention, it is now possible to assemble workpieces using machine tools, making it possible to greatly advance the complex production system and realizing extremely efficient machine work. can.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a notching tool according to an embodiment of the present invention, and FIG. 2 is a plan view showing an example of the use of the notching tool according to the present invention. 1... Tool holder, 3... Knock push rod, 18
... Disc spring, 21 ... Workpiece, 23 ... Knock pin supply tool.

Claims (1)

[Scope of utility model registration request] One end of an elongated knock push rod is held in a tool holder that is attached to and detached from a spindle head of a machine tool so as to be able to reciprocate in the axial direction, and is biased by a spring body so as to be pushed forward. The pushing force of the spring body is set to be larger than the maximum pushing force of the knock push rod, and the rigidity of the collided part is set so as not to damage the hit part when the knock push rod collides with each part of the machine. A notch pushing tool characterized by being set smaller than the force.