JP3127524U - Knurl piece for serration molding of cylindrical end face - Google Patents

Abstract

An object of the present invention is to reduce omission of selection chevron.
A knurled piece 6 for rolling a material end surface W1 by rolling around an axis of the material W while rolling on an end surface W1 of a cylindrical material W. The base 6a is formed in a truncated cone having a length longer than the thickness of the material end face W1 and having a predetermined cone bus angle θ, and the teeth 8 formed along the generatrix direction of the base 6a are circumferential directions of the base 6a. The base 6a has a small-diameter surface 13 directed toward the axis of the material W, and the axis of the substrate 6a is inclined with respect to the material end surface W1 with the cone bus angle θ of the substrate 6a. .
[Selection] Figure 1

Description

  The present invention is a cylinder for rolling a rotation-preventing selection consisting of radial irregularities on an annular end surface of a bush used as a core material of a columnar vibration-proof rubber used in an automobile suspension system or engine system. The present invention relates to a knurling piece for serration molding of a body end surface.

Conventionally, as disclosed in Patent Document 1, the bush has a chevron-shaped serration in which tooth traces are arranged in the radial direction along the entire circumference of both ends of a cylindrical body having a through-hole for a fastening bolt at its core. And chamfering is performed on the inner and outer peripheries of the both end faces.
When processing the end face of this bush, the knurling piece and the chamfering tool equipped on the selection machine are used as the axis of the material while holding the outer periphery of the cylindrical material on the selection machine. By pressing against both end faces of the material while rotating around the core, a selection is formed on both end faces of the material, and at the same time, chamfering is formed on the inner and outer peripheries of both ends of the material.
JP-A-5-237582 (FIGS. 4, 5, and 7)

However, the knurling piece in the above-mentioned processing machine dedicated to the selection is formed in a disk shape having the same diameter at both end faces, and a plurality of chevron teeth parallel to the axis of the knurling piece are provided around the circumferential surface. The knurled piece having such a shape rolls a selection on the end surface of the ring while rolling about the axis of the material.
Therefore, although the inner and outer circumferences of the material end face have a difference in circumference, the contact diameters of the knurling pieces corresponding to the inner and outer circumferences are the same and the circumferential speeds thereof are the same. The pitch error of the selection collapses the shape of the selection chevron, resulting in a lack of the selection chevron, making it difficult to form the desired selection, and has a high product defect rate. is doing.
Accordingly, an object of the present invention is to provide a knurling piece for serration molding that can reduce missing omissions in a selection.

  In view of the above problems, the knurled piece of the present invention rolls the material end face by turning around the axis of the material while rolling on the end face of the cylindrical material, The base of the piece has a length longer than the thickness of the end face of the material and is formed in a truncated cone having a predetermined cone bus angle, and the teeth formed along the bus direction of the base are equally spaced in the circumferential direction of the base The base is configured such that a small-diameter surface of the base is directed toward the axis of the material, and the base of the base is inclined with respect to the end surface of the base with a cone bus angle of the base. .

  In short, in the present invention, the base of the knurled piece is formed in a truncated cone having a length longer than the thickness of the end face of the material and having a predetermined cone bus angle, and a tooth portion formed along the bus direction of the base is formed on the base of the base. Since a plurality of equal intervals are provided in the circumferential direction, the small-diameter surface of the base body is oriented toward the axis of the material, and the axis of the base is inclined with respect to the end surface of the material with the cone bus angle of the base. By setting the cone bus angle so that the peripheral speed on the large-diameter surface side increases from the small-diameter surface side of the knurled piece according to the peripheral length difference between the inner and outer circumferences of the material end face, the knurled piece rolling on the material end face is Since the large diameter surface side rotates faster than the small diameter surface side and can cope with the circumferential length difference between the inner and outer circumferences of the material end surface, there is no pitch error between the small diameter surface side and the large diameter surface side of the knurled piece, and the material end surface A tooth trace along the entire circumference along the radial direction Mountain toothed selector - its practical effect very large, or the like can be orderly shaping the Deployment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a main part of a processing machine dedicated to selection using knurled pieces according to the present invention.
This dedicated processing machine 1 includes a work holder 2 that grips a half circumference of a cylindrical metal material W having a predetermined length from above and below, and an axial center of the material W on the left and right of the work holder 2. It is mainly composed of a rotating tool holder 3.

  The work holders 2 are formed as a pair of upper and lower parts, and the upper work holder 2 moves up and down with respect to the lower work holder 2 so that the material W is gripped by the work holder 2 so that both ends of the material W are workpieces. The holder 2 protrudes from the left and right end surfaces by a predetermined length, and the axis of the material W is held horizontally.

The tool holder 3 is equipped with chamfering tools 4 and 5 and a knurling piece 6 oriented to each end face of the material W.
The left and right tool holders 3 are rotated in the opposite directions, and the tool holders 3 attach the tools 4 to 6 attached thereto to the end face W1 of the material W fixed to the work holder 2. It is movably provided to the left and right so that it can be moved freely.

The chamfering tools 4 and 5 are composed of an inner peripheral chamfering tool 4 and an outer peripheral chamfering tool 5, and both tool tools 4 and 5 are tool holders so that each cutting edge corresponds to the inner and outer periphery of the material end face W1. 3 is attached.
The knurled piece 6 is attached to the tool holder 3 via a knurled holder 7 that rotatably supports the knurled piece 6.

Next, the knurled piece 6 will be described in detail.
The knurled piece 6 has a length (height) whose base 6a is shorter than the material W radius and longer than the thickness of the material end face W1, and has a predetermined cone bus angle (between the central axis of the base 6a and the bus). A plurality of chevron-shaped tooth portions 8 formed in a truncated cone having an angle θ and formed along the generatrix direction of the base body 6a are provided at equal intervals in the circumferential direction of the base body 6a. The processed surface 10 of the knurled piece 6 in which irregularities (the tooth portions 8 and the tooth grooves 9) are alternately continued is formed on the peripheral surface of the base 6a by the tooth grooves 9 therebetween.
Note that the conical bus line angle θ shown in the figure indicates an angle between the bus bar of the base 6a and an auxiliary line parallel to the central axis of the base 6a for convenience.
Further, a shaft insertion hole 11 is formed through the shaft core of the knurling piece 6 (base 6a), and a shaft 12 installed between the two forks of the knurling holder 7 is inserted into the shaft insertion hole 11. Thus, the knurled piece 6 is supported by the knurled holder 7 so as to be rotatable with respect to the support shaft 12.
The small-diameter surface 13 of the knurling piece 6 (base 6a) is directed toward the axis of the material W, and the axis of the base 6a (corresponding to the support shaft 12) is conical bus angle of the base 6a with respect to the material end surface W1. The knurled holder 7 is attached to the tool holder 3 so as to be inclined with θ.
The cone bus angle θ of the knurled piece 6 is set so that the peripheral speed on the large-diameter surface 14 side of the knurled piece 6 is increased by the difference in the outer circumference according to the difference between the inner circumference and the outer circumference of the material end face W1. ing.

  As a specific example of the knurled piece 6, when the outer diameter of the material W is about 25 mm or less and the thickness of the material end face W1 is about 6.0 mm or less, the knurled piece 6 (base 6a) as shown in FIGS. Has a height (height) of 6 to 8 mm, a diameter of the large-diameter surface 14 of about 19.5 mm, and a cone bus angle θ of about 3 to 6 °. The apex angle of the portion 8 is set to about 90 °, the apex angle of the tooth gap 9 is set to about 90 °, the height of the tooth portion 8 is set to about 0.55 mm, and the pitch of the tooth portion 8 is set to about 1.5 mm.

  As another example of the knurled piece 6, when the outer diameter of the material W is about 25 mm or less and the thickness of the material end face W1 is about 6.0 mm or less, as shown in FIGS. 6 and 7, the knurled piece 6 (base 6a) Has a height (height) of 6 to 8 mm, a diameter of the large-diameter surface 14 of about 19.5 mm, and a cone bus angle θ of about 3 to 6 °. The apex angle of the part 8 is set to about 90 °, the root width of the tooth gap 9 with the flat bottom is set to about 0.40 mm, the length of the tooth part 8 is set to about 0.50 mm, and the pitch of the tooth part 8 is set to about 1.6 mm. is doing.

When machining the material end face W1, as described above, the inner and outer chamfering tools 4 and 5 and the knurling piece 6 according to the present invention are set in the tool holder 3, and the processing machine 1 dedicated to the selection is operated. Let
That is, the left and right tool holders 3 are pressed against the respective end faces W1 of the material W fixed to the work holder 2 while rotating in the opposite directions around the axis of the material W.
The knurled piece 6 is inclined with respect to the material end surface W1 with a conical bus angle θ, so that the processing surface 10 is circumscribed on the material end surface W1 and rotates on the material end surface W1 while the axis of the material W is rotated. The material end face W1 is rolled by turning around the center.
The cone bus angle θ is set so that the peripheral speed on the large-diameter surface 14 side of the knurled piece 6 is increased by the outer peripheral difference according to the peripheral length difference between the inner periphery and the outer periphery of the material end surface W1. Therefore, the knurled piece 6 that rolls on the material end face W1 rotates faster on the large-diameter surface 14 side than the small-diameter surface 13 side, and corresponds to the circumferential length difference between the inner and outer circumferences of the material end face W1. There is no pitch error between the tooth portion 8 and the tooth gap 9 on the 13th side and the large-diameter surface 14 side, and a chevron-shaped selection S with tooth traces extending in the radial direction on the entire circumference of the material end face W1. It can be formed orderly.

  The selection S is as shown in FIGS. 4 and 5 when the knurling piece 6 shown in FIGS. 2 and 3 is used, and as shown in FIGS. 8 and 9 when the knurling piece 6 shown in FIGS. The tooth portion 8 and the tooth groove 9 of the knurling piece 6 are in an uneven shape that is inverted up and down.

Simultaneously with the rolling of the knurling piece 6, the inner peripheral chamfering bit 4 and the outer peripheral chamfering bit 5 each of the cutting edges rotate around the inner core and outer periphery of the material end face W1 about the axis of the material W. Chamfer each of the inner and outer circumferences of the material end face W1.
As a result, the above-described selection S is formed on both end faces W1 of the material W, and at the same time, a bush B having chamfered portions C1, C2 formed on the inner and outer circumferences of the both end faces W1 of the material W is obtained. (See FIGS. 4, 5, 8, and 9).
The bush B processed as described above is shorter than the length of the bush B, and is inserted into a shaft hole of a columnar vibration-proof rubber with a metal ring fitted thereto. A finished product (not shown) is produced in which each end of the bush B protrudes from the center of each end face of the vibration-proof rubber.

It is a figure which shows the principal part of the selection processing machine using the knurled piece which concerns on this invention. It is a top view of a knurled piece. It is a side view same as the above. It is a top view of the bush shape | molded by the knurled piece same as the above. It is a side view of a bush same as the above. It is a top view which shows the other example of a knurled piece. It is a side view same as the above. It is a top view of the bush shape | molded by the knurled piece same as the above. It is a side view of a bush same as the above.

Explanation of symbols

6 Knurled pieces
6a Base 8 Teeth
13 Small-diameter surface θ Cone bus angle W Material
W1 end face

Claims (1)

  A knurled piece that rolls a material end face by rolling around the axis of the material while rolling on the end face of a cylindrical material, and the base of the knurled piece is longer than the thickness of the end face of the material. The base is formed in a truncated cone having a predetermined cone bus angle, and a plurality of tooth portions formed along the base line direction of the base are provided at equal intervals in the circumferential direction of the base. A knurling piece for serration molding of a cylindrical body end surface, wherein the surface is oriented toward the axis of the material and the axis of the substrate is inclined with respect to the end surface of the material with a cone bus angle of the substrate.

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