JP4883961B2 - Broach blade support structure - Google Patents

Description

The present invention relates to a support structure for a broach blade of a broaching apparatus that performs broaching of an inner diameter keyway .

(1) The broaching blade support structure of the conventional broaching device fixes both ends of the broaching blade in a broaching machine that operates the broaching blade in the vertical direction.
Moreover, in the broaching device that moves the broaching blade laterally, one end of the broaching blade is fixed to the pulling operation portion, and the one end is brought into a free state.
(2) A structure for supporting an object to be processed in a conventional broaching apparatus (hereinafter referred to as “processed object”) includes a guide piece having a broach blade guide groove and a single threaded hole. A bolt was passed through and screwed into a screw hole on the apparatus side to fasten and fix the guide piece.

(1) The broach blade support structure that fixes both ends or one end of the broach blade in the above-described prior art must be difficult to align the center of the broach blade with the center of the fixed guide groove. In addition, there is often a slight deviation between the center of the broach blade and the guide groove during the cutting operation. In this case, it becomes difficult to maintain the adhesion between the broach blade and the guide groove of the broach blade accurately, and the broach blade The straightness of the blade is distorted and high machining accuracy cannot be obtained, and it has the disadvantage that cutting is performed with the broach blade warped and abnormal force is applied to the blade tip and the tool life is shortened. .
(2) Since the position of simply fixing the guide piece with the bolt cannot be adjusted in the above-described prior art, when using a broach blade having a different key groove depth, replace the broach blade with each replacement. The guide piece had to be exchanged and had the disadvantage of poor workability.
Also, if the adhesion between the broach blade and the broach blade guide groove is poor, it cannot be adjusted, so high processing accuracy cannot be obtained, and cutting with the broach blade being warped will cause abnormal force. This has the disadvantage that the tool life is shortened by hanging on the part.
Further, the blade cannot be used after refurbishing the blade, which is not economical.
None None

In view of the drawbacks of the prior art as described above, the present invention is directed to a broaching blade capable of always matching the center of the broaching blade with the center of the broaching blade guide groove of the guide piece. It is intended to provide a support structure. Another object of the present invention is to adjust the center of the broach blade to the center of the guide groove broach blade guide groove, and even when using a broach blade having a different key groove depth to be formed, it is only necessary to replace the broach blade. An object of the present invention is to provide a support structure for a broach blade that improves workability without exchanging pieces.
Another object of the present invention is to allow the center of the broach blade and the center of the broach blade guide groove of the guide piece to always match, and even when using a broach blade having a different key groove depth, only replacing the broach blade. It is an object of the present invention to provide a support structure for a broach blade that improves workability without exchanging guide pieces.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, the present invention is configured as follows.
<Invention of Claim 1>
A fixed base plate having a blade through hole for passing a broach blade that has a blade only on the upper surface and passes an inner diameter key groove through the workpiece by a pulling operation;
A broach drive that is positioned on the back side of the base plate and pulls the broach blade to perform cutting operation;
A guide piece main body, a guide rail on which the workpiece protruding from the guide piece main body is set, and a broach provided on the guide rail, into which the broach blade fits and supports and guides the broach blade at a cutting portion of the workpiece A guide piece formed of a guide groove and attached to the outside of the base plate;
A float piece detachably attached to the root of the broach blade from the root side;
A float chamber that is located on the back side of the base plate, is provided at or attached to the tip of the drive unit, and accommodates the float piece so as to freely move, and has an open surface facing the base plate. The float body,
The broaching blade is attached to the broaching blade in a state where the broaching blade is passed from the base side to the through hole, the float piece is attached, and the float piece is housed in the float chamber. The float body is detachably attached to close the opening of the float chamber, and includes a float cover that stops the float piece from exiting the float chamber during the cutting operation.
At the time of the cutting operation, the lower surface of the broach blade is pressed and brought into close contact with the upper surface of the broach blade guide groove, and the float piece moves along with the contact operation to cause an abnormal load on the broach blade. It is a support structure of a broach blade characterized by realizing a cutting operation which is not.
<Invention of Claim 2>
The broach guide groove of the guide piece is a non-movable fixed surface where the lower surface of the broach blade is pressed, and the guide piece slides in the depth direction of the broach blade guide groove to position the broach blade guide groove. The broach blade support structure according to claim 1 , wherein the support structure is movably attached to the outside of the base plate so as to be adjusted .
<Invention of Claim 3>
The support structure for a broach blade according to any one of claims 1 and 2, wherein the float cover and the float piece are in a form of direct contact with no sliding means therebetween. .

As is clear from the above description, the present invention has the following effects.
<Effect of the Invention of Claim 1>
A fixed base plate having a blade through hole for passing a broach blade that has a blade only on the upper surface and passes an inner diameter key groove through the workpiece by a pulling operation;
A broach drive that is positioned on the back side of the base plate and pulls the broach blade to perform cutting operation;
A guide piece main body, a guide rail on which the workpiece protruding from the guide piece main body is set, and a broach provided on the guide rail, into which the broach blade fits and supports and guides the broach blade at a cutting portion of the workpiece A guide piece formed of a guide groove and attached to the outside of the base plate;
A float piece detachably attached to the root of the broach blade from the root side;
A float chamber that is located on the back side of the base plate, is provided at or attached to the tip of the drive unit, and accommodates the float piece so as to freely move, and has an open surface facing the base plate. The float body,
The broaching blade is attached to the broaching blade in a state where the broaching blade is passed from the base side to the through hole, the float piece is attached, and the float piece is housed in the float chamber. The float body is detachably attached to close the opening of the float chamber, and includes a float cover that stops the float piece from exiting the float chamber during the cutting operation.
At the time of the cutting operation, the lower surface of the broach blade is pressed and brought into close contact with the upper surface of the broach blade guide groove, and the float piece moves along with the contact operation to cause an abnormal load on the broach blade. Since the support structure of the broaching blade is characterized by realizing a cutting operation that does not occur, the following effects can be obtained.
When the workpiece is set and the cutting operation is started, the broach blade is pressed and brought into close contact with the broach blade guide groove. The base of the broach blade connected to the float mechanism moves as the broach blade is pressed and brought into close contact. The center of the broaching blade and the center of the broaching blade guide groove are always aligned so that optimum adhesion between the broaching blade and the broaching blade guide groove is always obtained, and cutting with high machining accuracy is performed in an optimum state. Can be obtained.
As a result, high-accuracy machining can be realized easily at all times, and a cutting operation without an abnormal load on the broach blade can be realized, so that the life of the blade can be extended.
Since the float cover can be removed and the float piece can be removed, the effect that the broach blade can be easily replaced can be obtained.
<Effects of Invention of Claim 2>
The broach guide groove of the guide piece is a non-movable fixed surface where the lower surface of the broach blade is pressed, and the guide piece slides in the depth direction of the broach blade guide groove to position the broach blade guide groove. since regulation is a support structure of the broach cutter according to claim 1, characterized by being movably attached to the outside of the base plate to allow, with a similar effect as the invention of claim 1, wherein The following effects can be obtained.
Since the position of the broach guide support can be adjusted, the center of the broach blade and the center of the broach blade guide groove of the guide piece can be adjusted, and even when using a broach blade with a different key groove depth, only replacing the broach blade Since the guide piece is not exchanged, the workability can be improved.
In addition, it is possible to obtain an effect that a broach blade that has been polished again can be set, and the amount that has been polished can be adjusted and used continuously.
<Effect of the Invention of Claim 3>
The support structure for a broach blade according to any one of claims 1 and 2, wherein the float cover and the float piece are in a form of direct contact with no sliding means therebetween. than, the same effects as the invention according to claim 1.

Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

In the first preferred embodiment for carrying out the present invention shown in FIGS. 1 to 4, reference numeral 1 denotes a broaching device, and this broaching device 1 is clamped and fixed to a chuck portion 3 of an existing lathe device 2. And a broach made of a screw rod body that is formed over the entire length of a nut piece 4 that is screwed into the nut piece 4 and that prevents a rotation stop groove (not shown) from rotating around the nut piece 4 so as to move straight. A broach drive unit 6 for cutting and driving the blade 5 and a detent fixed to the lathe device 2 having a fitting projection 7 which fits in a rotation stop groove of the broach drive unit 6 to prevent the 6 from rotating and to move straight. A part 8 and a processing part 9 that supports the broaching blade 5 and cuts a workpiece. The broach drive unit 6 is passed through a guide unit 10 attached to the lathe device 2.
The processing unit 9 is fixed to the lathe device 2 and has a housing 12 having a work opening 11 through which the broach driving unit 6 is passed, a broach blade support guide unit 13 provided at the front of the housing 12, and a broach It consists of a float mechanism 36 that connects the broach blade 5 to the drive unit 6.

The broach blade support guide 13 is a disc-shaped base plate 14 fixed to the front portion of the housing 12, and a rectangular slide that is fastened and fixed to the base plate 14 by bolts 15 and nuts 16 so as to be vertically slidable. It consists of a plate 17 and a guide piece 27 fixed to the slide plate 17 by bolts 15 and nuts 16 in a non-movable manner.
The base plate 14 is provided with six screw-through holes 19 on the peripheral side of the disc-shaped base plate main body 24 for fixing the 14 to the housing 12 with bolts 18, and the center for passing the broach blade 5. A screw having a shape in which a blade through hole 20 is opened, a slide plate 14 is fitted, a slide support groove 21 for supporting and guiding a predetermined slide is formed, and the bolt 15 is passed through and loosened. Through-slide holes 22 a and 22 b are provided on the left and right, and scales 23 a and 23 b are provided on both outer sides of the slide groove support groove 21.
The slide plate 17 includes a square plate-shaped slide plate body 25, a protruding portion 26 that fits in a slide support groove 21 formed on the back portion of the slide plate body 25, and a guide piece 27 that is formed in the center of the slide plate body 25. Is inserted into guide piece fitting holes 28, bolt through holes 29 a and 29 b through which bolts 15 formed on the left and right sides of the 28 are passed, and guide piece fitting holes 28 provided on the left and right side portions of the slide plate body 25. It is composed of a reference line 35 formed with a ruled pattern that matches the scales 23a and 23b indicating the center position of the guide piece 27.
The guide piece 27 includes a disc-shaped guide piece main body 30 whose upper portion is cut, a slide plate fitting portion 33 that fits into a guide piece fitting hole 28 that is formed to protrude from the back of the guide piece main body 30, and the guide piece main body 30. A guide rail 31 protruding forward from the center, a broach blade guide groove 32 into which a broach blade 5 formed so as to penetrate the guide piece main body 30, the slide plate fitting portion 33 and the guide rail 31 is fitted and guided, and a bolt The base plate 14, the slide plate 17, and the guide piece 27 form a broach blade support structure A.
The slide plate 17 and the guide piece 27 are fixed to the base plate 14 fixed to the housing 12. If necessary, the bolt 15 is loosened and the slide plate 17 and the guide piece 27 are slid to adjust the fixing position.

The float mechanism 36 includes a bolt 37 that is screwed into a screw hole 41 threaded at the tip of the broach drive unit 6, a float chamber 38 that is opened on the opposite side of the 37, and a male that is screwed forward on the outer periphery of the main body. A float body 40 composed of a threaded portion 39, and a circular block-shaped float piece 44 having a screw hole 43 for fitting a bolt 42 provided at the root tip of the broach blade 5 housed in the float chamber 38, A female screw part 45 that opens and is fitted on the male screw part 39 is provided on the inner side of the opening, and the front part of the float main body 40 that is provided with a through hole 46 through which the broach blade 5 passes is closed in the float chamber 38. It consists of a float cover 47 that traps the piece 44.
In the actual example, the diameter of the float piece 44 is 21 mm, the diameter of the float chamber 38 is 25 mm, and the restriction range in which the float piece 44 can slide horizontally is 1.5 mm from the center.
With the above configuration, the center of the broach blade 5 can only be moved horizontally by the float mechanism 36, and the slide plate 17 integrated with the broach blade guide groove 32 is moved up and down, so that the center of the broach blade 5 and the broach blade guide are provided. The center of the groove 32 can be easily adjusted.
At the time of cutting, the lower surface of the broach blade 5 is pressed against the upper surface of the broach blade guide groove 32 caused by cutting the upper surface of the key groove and the reaction force of pressing the workpiece 50 in the thrust direction on the broach blade 5. Power works at the same time. A mechanism that keeps the broach blade 5 and the broach blade guide groove 32 accurately in close contact with each other is realized by giving freedom of movement in the parallel direction to the movement of the broach blade 5 without countering the force at the time of cutting. .
The float mechanism 36 forms a support structure B for the broach blade.
Further, the broaching blade support structure C and the broaching blade support structure B form a broaching blade support structure C.

A wide opening may be provided so that the float piece 44 and the float cover 47 are attached to and removed from the broach blade 5 above the base piece 14 and the guide piece fitting hole 28 of the slide plate 17.
The float piece may be provided in the broach blade from the beginning or may be integrated.
Form formed by integrally forming the float chamber to the broach drive unit, forms may comprising a float cover provided threaded mounting Rene di unit together.
A form in which the float chamber is formed between the float body or the broach drive unit and the float cover is also possible.
There may be a configuration in which a hook portion in the form of a longitudinal groove is provided in the float main body or the broach drive portion, and a float cover in which a float piece is fitted into this hook portion is not used.

<Support structure of broach blade of appendix 1>
A broach drive unit for cutting the broach blade, a float mechanism unit for connecting the broach drive unit and the broach blade, and a broach blade guide groove of the broach blade for supporting and guiding the broach blade at a cutting site of a workpiece. The broaching blade guide support portion, and the connecting portion of the broaching blade connected to the float mechanism portion in the float mechanism portion freely moves so that the center of the broaching blade is aligned with the center of the broaching blade guide groove. Because it constitutes the support structure of the broach blade that is supported like
When the workpiece is set and the cutting operation is started, the broach blade is pressed and brought into close contact with the broach blade guide groove. The base of the broach blade connected to the float mechanism moves as the broach blade is pressed and brought into close contact. The center of the broaching blade and the center of the broaching blade guide groove are always aligned so that optimum adhesion between the broaching blade and the broaching blade guide groove is always obtained, and cutting with high machining accuracy is performed in an optimum state. Can be obtained.
As a result, high-accuracy machining can be realized easily at all times, and a cutting operation without an abnormal load on the broach blade can be realized, so that the life of the blade can be extended.
<Support structure of broach blade of appendix 2>
In the configuration of the invention described in the above supplementary note 1, the float mechanism unit is freely provided within a regulation range within a regulation range, a float body provided in or attached to the broach drive unit, a float chamber provided in the float body, and the float chamber. A float piece having a blade attachment portion that detachably attaches one end of a broach blade housed so as to move, and the float chamber is closed to freely move the float piece to the float chamber within the regulation range. Since it constitutes a support structure for a broach blade consisting of a float cover that is detachably attached to the float body to be confined,
While obtaining the same effect as the above-mentioned supplementary note 1, since the float cover can be removed and the float piece can be removed, the effect that the broach blade can be easily replaced can be obtained.
<Support structure of broach blade of appendix 3>
A broach driving part for cutting the broach blade, and a broach blade guide support part having a broach blade guide groove of the broach blade for supporting and guiding the broach blade at a cutting part of the workpiece. Since it constitutes a support structure for the broach blade that is slid in the depth direction of the broach blade guide groove so that the position of the broach blade guide groove can be adjusted,
Since the position of the broach guide support can be adjusted, the center of the broach blade and the center of the broach blade guide groove of the guide piece can be adjusted, and even when using a broach blade with a different key groove depth, only replacing the broach blade Since the guide piece is not exchanged, the workability can be improved.
In addition, it is possible to obtain an effect that a broach blade that has been polished again can be set, and the amount that has been polished can be adjusted and used continuously.
<Support structure of broach blade of appendix 4>
A broach drive unit for cutting the broach blade, a float mechanism unit for connecting the broach drive unit and the broach blade, and a broach blade guide groove of the broach blade for supporting and guiding the broach blade at a cutting site of a workpiece. The broaching blade guide support portion, and the connecting portion of the broaching blade connected to the float mechanism portion in the float mechanism portion freely moves so that the center of the broaching blade is aligned with the center of the broaching blade guide groove. The broach blade support structure is configured such that the position of the broach blade guide groove can be adjusted by sliding the broach guide support portion in the depth direction of the broach blade guide groove. Because
When the workpiece is set and the cutting operation is started, the broach blade is pressed and brought into close contact with the broach blade guide groove. The base of the broach blade connected to the float mechanism moves as the broach blade is pressed and brought into close contact. In addition, the center of the broach blade and the center of the broach blade guide groove are always aligned, the optimum adhesion between the broach blade and the broach blade guide groove is always obtained, and cutting with high machining accuracy is performed in an optimum state. Broaching blades with different depths of key grooves to be formed, because the cutting operation without abnormal load on the broaching blade is realized, so that the tool life can be extended and the position of the broach guide support can be adjusted. Even in use, only the broach blade is replaced and the guide piece is not replaced, so workability is improved. Other content adjusted to be able to obtain the effect that continue to be used.

The present invention is used in the industry of manufacturing broaching devices.

1 is an overall view of a broaching device according to a first embodiment for carrying out the present invention. Sectional drawing of the process part of the best 1st Embodiment for implementing this invention. The assembly exploded perspective view of the float mechanism part of the best 1st embodiment for carrying out the present invention. The assembly exploded perspective view of the broach blade support guide part of the 1st embodiment of the best for carrying out the present invention.

A, B, C: Brooch blade support structure,
1: Broaching device, 2: Lathe device,
3: Chuck part, 4: Nut piece,
5: Broach blade, 6: Broach drive,
7: Fitting protrusion, 8: Non-rotating part,
9: Processing part, 10: Guide part,
11: Work opening, 12: Housing
13: Broach blade support guide, 14: Base plate,
15: bolt, 16: nut,
17: Slide plate, 18: Bolt,
19: Screw through hole, 20: Blade through hole,
21: Slide support groove,
22a, 22b: screw through slide hole, 23a, 23b: scale,
24: Base plate body, 25: Slide plate body,
26: Projection part, 27: Guide piece,
28: Guide piece fitting hole, 29a, 29b: Bolt through hole,
30: Guide piece body, 31: Guide rail,
32: Broach blade guide groove, 33: Slide plate fitting part,
34a, 34b: screw through holes, 36: float mechanism,
35: Reference line, 37: Bolt,
38: Float chamber, 39: Male screw part,
40: Float body, 42: Bolt,
43: Screw hole, 44: Float piece,
45: Female thread part, 46: Through hole,
47: Float cover, 50: Workpiece.

Claims (3)

A fixed base plate having a blade through hole for passing a broach blade that has a blade only on the upper surface and passes an inner diameter key groove through the workpiece by a pulling operation;
A broach drive that is positioned on the back side of the base plate and pulls the broach blade to perform cutting operation;
A guide piece main body, a guide rail on which the workpiece protruding from the guide piece main body is set, and a broach provided on the guide rail, into which the broach blade fits and supports and guides the broach blade at a cutting portion of the workpiece A guide piece formed of a guide groove and attached to the outside of the base plate;
A float piece detachably attached to the root of the broach blade from the root side;
A float chamber that is located on the back side of the base plate, is provided at or attached to the tip of the drive unit, and accommodates the float piece so as to freely move, and has an open surface facing the base plate. The float body,
The broaching blade is attached to the broaching blade in a state where the broaching blade is passed from the base side to the through hole, the float piece is attached, and the float piece is housed in the float chamber. The float body is detachably attached to close the opening of the float chamber, and includes a float cover that stops the float piece from exiting the float chamber during the cutting operation.
At the time of the cutting operation, the lower surface of the broach blade is pressed and brought into close contact with the upper surface of the broach blade guide groove, and the float piece moves along with the contact operation to cause an abnormal load on the broach blade. A support structure for a broach blade, characterized in that it achieves no cutting action . The broach guide groove of the guide piece is a non-movable fixed surface where the lower surface of the broach blade is pressed, and the guide piece slides in the depth direction of the broach blade guide groove to position the broach blade guide groove. 2. The broach blade support structure according to claim 1 , wherein the support structure is movably attached to the outside of the base plate so as to be adjusted .
is. The support structure for a broach blade according to any one of claims 1 and 2, wherein the float cover and the float piece are in a form of direct contact with no sliding means therebetween .

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