JPS6330127A - Horizontal divided type multiple compression die - Google Patents

Abstract

PURPOSE:To prevent the opening on the divided face of the insert divided in the axial orthogonal direction and to facilitate the change of the insert by providing the axial direction fastening means to fasten the insert in the axial direction by utilizing the fastening force in the diameter direction fed from a fastening cylindrical body. CONSTITUTION:The insert 20 having a die hole 10 is divided into 1st, 2nd cylindrical bodies 21, 22 by the divided face in the axial orthogonal direction, held by being fitted to an insert holder 30 and press-fitted taperingly to a fastening cylindrical body 40. Taper faces 24, 36 are respectively formed at the corresponding position on the insert holder 30 and 2nd cylindrical body 22, composing the axial direction fastening means together with the upper part step part 23 and bulging part 35. Since the insert 20 namely cylindrical bodies 21, 22 are fastened in the axial direction by utilizing the fastening forced in the diameter direction transmitted from the fastening cylindrical body 40 by this fastening means, no opening is caused on the divided face on the die hole 10. Consequently the formation of a burr, etc., on the product subjected to an extrusion forming can be prevented.

Description

Detailed Description of the Invention [Industrial Application rF] The present invention relates to a horizontally divided 11-type multiple interference fit mold having inserts divided in the direction perpendicular to the axis, and is suitable for use in forging dies such as extrusion processing. It can be used as

[Background technology and its problems]

Conventionally, forging dies used for extrusion processing etc. have to be able to sufficiently withstand high pressure during processing, and the insert is preloaded with multiple tight-fitting cylindrical bodies to maintain the allowable internal pressure of the die hole. Various measures have been taken to prevent the insert from breaking, such as increasing the height of the insert. For example, when a die hole has shoulders with different inner diameters, forces are applied to the shoulders in two directions, radial and axial, and breakage is likely to occur due to stress concentration. Divide vertically or perpendicularly to the axis, i.e. horizontally,
Each divided part shares the force in one direction to prevent breakage.

When using such a split insert, the split surface expands due to the internal pressure of the die hole during extrusion processing, creating a so-called opening, and the blank may enter the gap and remain as a lump on the surface of the product. , it is necessary to tighten the dividing surface in advance. However, the horizontally split type insert, which is divided in the direction perpendicular to the axis, cannot produce the tightening force in the radial direction of the tightening cylinder as the 11γ force on the S1 surface. Although it is customary to keep it attached,
When tightening with bolts, etc., it is not possible to obtain sufficient tightening force against the pressure of the extrusion process performed at the die Omukai, so openings are unavoidable, and the structure around the mold becomes complicated.
There were drawbacks such as a decrease in strength due to interference with the pond members. In particular, in inserts with taper press-fit allowances that are configured so that only the insert can be replaced due to wear in the die hole, the axial tightening force is received by the tapered surface, and the opening of the dividing surface in the direction perpendicular to the axis There is a problem in that it is extremely difficult to prevent opening.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontally split multiple interference fit mold which has a simple structure, allows easy replacement of inserts, and prevents opening of the split surface.

[Means and effects for solving the problems] The present invention has the following features:
An axial tightening means that tightens the insert in the axial direction using a radial tightening force from the tightening cylinder prevents the insert from opening at the dividing surface of the insert in the axially orthogonal direction.

Therefore, the present invention provides an insert that has a die hole and is divided in the direction perpendicular to the axis, an insert holder that holds the insert inside and is formed with circumferential stress relaxation means consisting of cuts in the axial direction. In addition to providing this insert holder with a tightening cylinder press-fitted into a taper inside,
An axial tightening means for axially tightening the insert using the tightening force from the tightening cylinder is provided between the insert and the insert holder to form a horizontally split multiple interference fit mold.

In the present invention configured in this manner, after the insert holder is removed from the tightening cylinder, the insert held in an expanded state by the circumferential stress relaxation means is taken out and replaced. On the other hand, after installing the insert, by press-fitting the insert holder into the tightening tube, the insert holder will give up the insert in the radial direction due to the tightening force from the tightening tube, and will also be tightened by the axial tightening means. The insert is tightened in the axial direction using the radial tightening force from the attached cylinder to prevent opening of the dividing surface of the insert divided in the direction perpendicular to the axis.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show a horizontally split multiple interference fit mold which is a first embodiment of the present invention. In the figure, an insert 20 having a die hole 10 is divided into a first cylindrical body 21 and a second cylindrical body 22 by a dividing plane perpendicular to the axis, and these first and second cylindrical bodies 21
．． 22 and is attached to an insert holder 30 that connects and holds the screws 22 and is tapered and press-fitted into the tightening cylinder 40.

The tightening cylinder 40 is formed by tightly fitting a tightening ring 42 inside a tightening ring 41 by shrink fitting or the like, and the inner peripheral surface 13 of the tightening cylinder 40 and the insert holder 30
The outer circumferential surface 31 of is subjected to a load-accumulating taper alignment process so that they are attached to each other when in full size.

The insert holder 30 is divided into a plurality of parts by an axial cut 32 serving as a circumferential stress relaxation means, and a split ring (C ring ), a retainer 34 made of a ring-shaped coil spring or the like is fitted. For this reason, the insert holder 30 is lightly tightened by the retainer 34 and is held together to prevent dissipation, etc., and is configured to be easily expanded. Incidentally, a flexible spacer such as a rubber band is interposed between each of the cuts 32, so that the intervals between the cuts 32 are uniform.

The insert 20 is housed inside the insert holder 30, and the first and second
The cylinders 21,22 are held axially connected to each other.

Here, in the center of the first cylindrical body 21 is a large diameter upper die hole 11.
is penetrated therethrough, and a small-diameter lower die hole 12 is penetrated through the center of the second cylindrical body 22 . Further, the upper end surface of the second cylindrical body 22 is connected to the lower die hole 12 and is connected to the upper die hole 1.
A plate-shaped shield part 13 is formed which is expanded to the same diameter as 1, and a die hole 10 is formed by these upper die hole 11, lower die hole 12, and shoulder part 13.

On the other hand, a step portion 23 is formed on the upper edge of the first cylinder 21,
A bulge 35 is formed on the inner side of the upper opening surface of the insert holder 30, and the first cylindrical body 21 accommodated in the insert holder 30 is inserted into the insert by engaging the step 23 and the bulge 35. It is prevented from protruding toward the upper end side of the holder 30.

Further, a first tapered surface 24 is formed on the outer peripheral surface of the second cylinder 22, and a second tapered surface 24 is formed corresponding to the first tapered surface 24 on the lower end side of the inner peripheral surface of the insert holder 30. A tapered surface 36 is formed, and the second cylindrical body 22 accommodated in the insert holder 30 has a tapered surface 36 formed thereon.
4.36 prevents it from protruding toward the lower end of the insert, and by tightening it from the outside applied to the insert holder 30, it can move upward and come into pressure contact with the first cylindrical body 21 at the dividing surface. ing. Here, the stepped portion 23, the bulging portion 35, and the first and second tapered surfaces 24.36 constitute an axial tightening means, and the insert 20 is attached to the insert holder 30 using a radial tightening force. Tightening in the axial direction is possible.

Furthermore, a sealing taper 25 having a slight clearance upward from the periphery of the die hole 10 toward the outer circumferential side is formed on the lower end surface of the first cylindrical body, and the first and second cylindrical bodies 21, 2
The structure is such that the axial tightening force applied to the dividing surface of the die hole 10 can be concentrated around the die hole 10 to improve sealing performance.

In this embodiment configured in this way, press 'A
After being attached to Z, the blank is housed in the die hole 10, compressed upward by a punch, and forward extruded downward.

At this time, the tightening cylinder 40 applies a radial tightening force to the insert 20 via the insert holder 30 to preload it.

Here, the insert holder 30 has a circumferential stress relaxation means which softens the circumferential stress generated in response to the tightening force of the tightening cylinder 40, and the insert holder 30
This prevents the tightening force from being attenuated. Therefore, the insert holder 30 efficiently (transmits) the tightening force from the tightening cylinder 40 to the insert 20, and
Pressure contact area with outer tightening cylinder 40 and inner insert 2
By concentrating the tightening force according to the ratio of the pressure contact area with 0 (in this case, the ratio of the inner and outer diameters), the preload on the insert 20 is increased, the allowable internal pressure of the die hole 10 is improved, and the insert 20 is prevented from breaking. To prevent.

Further, the insert 20 is divided in the direction orthogonal to the axis at the upper end of the shoulder portion 13, and the radial pressure applied to the upper die hole 11 and the axial pressure applied to the shoulder portion 13 are divided into first and second portions, respectively.
Since the stress is received by the cylindrical bodies 21 and 22, stress concentration does not occur, and destruction caused by this stress concentration is prevented.

Further, the axial tightening means uses the radial tightening force from the tightening cylinder 40 to tighten the insert 20, that is, the first cylinder 21.
In order to tighten the second cylindrical body 22 in the axial direction, the die hole 1 is
0 does not cause an opening at the dividing surface, and prevents the formation of cracks etc. on the extruded product.

On the other hand, when the die hole 10 is worn out, the insert holder 30 is pulled out together with the insert 20 by, for example, being knocked out in the opposite direction to the direction in which it was press-fitted. At this time, the insert holder 30 is free from the tightening force from the tightening cylinder 40 and can be expanded by the circumferential stress relaxation means, so the insert holder 30 is expanded and engaged with the axial tightening means. Instead, remove the insert 20 and replace it.

After that, after inserting and mounting a new insert 20, the insert holder 30 is tapered press-fitted into the tightening cylinder 40 to fix the insert 20 in the insert holder 30, and the axial tightening means is used to tighten the insert 20 in the axial direction. tighten it.

According to this embodiment, the following effects can be obtained.

That is, the insert 20 is inserted into the first and second cylindrical bodies 21 .
22, and is divided in the direction orthogonal to the axis at the upper end of the shoulder 13, it is possible to prevent the insert 20 from breaking due to the concentration of stress near the upper end of the shoulder 13, and to extend the life of the insert 20. Can be done.

In addition, since a means for axial tightening is provided to tighten the insert 20 in the axial direction, it is possible to prevent the divided surfaces of the insert 20, which are divided in the direction perpendicular to the axis, from opening due to internal pressure during processing, and to prevent the surface of the product from opening. It is possible to prevent the formation of flakes etc.

Further, the axial tightening means is constituted by the stepped portion 23, the bulging portion 35, and the first and second tapered surfaces 24 and 36 provided on the insert 20 and the insert holder 30, and Insert 2 using radial tightening force
0 is tightened in the axial direction, opening can be reliably prevented with a simple structure.

In addition, since the insert 20 is attached to the insert holder 30 and then tapered and press-fitted into the tightening cylinder 40, it can be pulled out again, and since the insert holder 30 is provided with a circumferential stress relaxation means, the insert holder 3
0 is expanded, the insert 20 can be pulled out regardless of the axial tightening means, and the insert 20 can be easily replaced.

Furthermore, the insert holder 30 does not generate a repulsive force in the circumferential direction against the tightening force from the tightening cylinder 40 due to the circumferential stress relaxation means, and efficiently transmits the tightening force to the insert 20. Since the stress is increased according to the ratio of the inner and outer pressure contact areas, the insert 20 can be tightened more strongly to increase the allowable internal pressure of the die hole 10, preventing breakage and extending the life.

In addition, the insert holder 30, which is divided into a plurality of parts by the cut 32, which is a circumferential stress relaxation means, is held together by a retainer 34 provided on the outer peripheral surface, so that it can be handled while preventing it from scattering when taken out. can be done extremely easily.

A second embodiment of the invention is shown in FIG.

The horizontally split type multiple interference fit mold of this embodiment is constructed with the same die hole 1O, insert 20, insert holder 30, and tightening cylinder 40 as in the first embodiment. The axial stress relaxation means of the embodiment includes a third portion in place of the step portion 23 and the bulge portion 35 in the first embodiment.
and a fourth tapered surface 26.37.

In this embodiment configured in this manner, the operation is similar to the first embodiment described above, but when a radial tightening force is applied from the tightening cylinder 40 to the insert holder 30, , the second cylindrical body 22 has first and second tapered surfaces 24 .
36, the first cylindrical body 21 is also pushed down by the third and fourth tapered surfaces 26.37, tightening the insert 20 in the axial direction.

According to this embodiment, in addition to the same effects as the first embodiment, the third and fourth tapered surfaces 26, 37
The insert 20 not only restricts the upward movement of the first cylindrical body 21 but also moves downward by the radial tightening force. It is possible to more reliably prevent openings at the dividing plane.

FIG. 4 shows a third New Year's Eve example of the present invention.

The horizontally split type multiple interference fit mold of this embodiment has the same die hole 10, insert 20, insert holder 30, and tightening cylinder 40 as in the first embodiment. The axial stress relaxation means of the embodiment is the insert 2
It is configured to include an engagement ring 50 that holds 0.

This engagement ring 50 is in pressure contact with the second cylindrical body 22 on the upper surface side and has a fifth tapered surface 51 on the peripheral portion on the lower surface side, and is formed near the lower end of the inner circumferential surface of the insert holder 30 and has a sixth tapered surface 51. It is fitted into an engagement groove 53 having a tapered surface 52 .

In this embodiment configured in this way, the first cylindrical body 2
1 is restricted from moving upward by the stepped portion 23 and the bulging portion 35, while being retained by the fifth and sixth tapered surfaces 51 and 52 when a radial tightening force is applied to the insert holder 30. Since the second cylindrical body 22 is moved upward via the coupling ring 50, the first and second cylindrical bodies 21.22, ie, the insert 20, are tightened in the axial direction.

According to this embodiment, in addition to the same effects as those of the embodiments described above, there is no need to perform taper processing on the first and second cylindrical bodies 21 and 22, which are replaced when the die hole 10 wears out. Since the insert holder 30 and the engagement ring 5o, which require taper processing, can be reused repeatedly, the die hole 1
The running cost associated with replacing the insert 20 can be significantly reduced when the insert 20 needs to be shaped to be easily worn.

Note that the present invention is not limited to the embodiments shown in the above embodiments, but also includes the following modifications.

That is, in each of the above embodiments, a horizontally split type insert 20 that is divided into two parts, the first and second cylindrical bodies 21 and 22, was used, but the number of divisions of the insert 2° may be three or more. It is often desirable to divide the die hole 1o appropriately at a portion where stress concentration failure is likely to occur depending on the shape of the die hole 1o. In this case, the axial tightening means should be configured to tighten portions located at both ends of the insert 20, which is divided into a plurality of parts. For example, when providing tapers at the top and bottom as in the second embodiment, one taper is provided at the top end and one at the bottom end,
It is desirable that the intermediate portion be configured to have a right cylindrical shape to avoid interference and attenuation of the clamping force and to apply sufficient clamping force to each divided surface.

In each of the above embodiments, the axial tightening means used is one that converts the radial tightening force into the axial direction by the taper shape formed on the insert 20 and the insert holder 30. The means are not limited to these, but the step portion 23 and the bulge portion 35 as in the first or third embodiment are formed at both ends of the insert 2o and the insert holder 3o, respectively, and the insert 2o is The length in the axial direction is configured to be shorter than the interval between the bulges 35 of the insert holder 30,
An axial tightening force may be applied by fitting the insert 2o into the insert holder 30 and then compressing and fixing it to the tightening cylinder 4o.

On the other hand, the tightening cylinder 40 is composed of double tightening rings 41 and 42, but it may have three or more layers, or it may be a single tightening ring.

In addition, the insert holder 30 is provided with a plurality of cuts 32 as circumferential stress relaxation means, and the insert holder 30 is divided into a plurality of parts υ1, but as shown in FIG. A port 32 may be provided, in which case the insert holder 30 remains integral with itself and the retainer 34 and retainer/g 33 may be omitted. However, in order to sufficiently relieve the stress in the circumferential direction, it is desirable to provide a plurality of cuts 32 as in each of the above embodiments.

Furthermore, as shown in FIG. 6, a plurality of slits 38 that do not completely cut the insert holder 3o may be provided alternately from the upper and lower ends as circumferential stress relaxation means (in such a case, the retainer 34 may be omitted). In addition, it has the effect of sufficiently relieving stress in the circumferential direction. However, if the structure is configured as in each of the above embodiments, the repulsive force at the time of expansion when the insert 20 is attached to the insert holder 30 is absorbed by the retainer. 34 can be set arbitrarily, and the insert holder 30 can be easily expanded.

In addition, the dimensions of each part, the shape of details, etc. can be changed as appropriate for each implementation.

〔Effect of the invention〕

As described above, according to the horizontally split type multiple interference fit mold of the present invention, the insert can be easily replaced and the split surface of the insert can be prevented from opening with a simple structure.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention;
3 is a sectional view showing the second embodiment of the invention, FIG. 4 is a sectional view showing the third embodiment of the invention, and FIG. 5 is a sectional view showing the first embodiment. 6 is a perspective view showing a part of a modification of the present invention, and FIG. 6 is a perspective view showing a part of a modification of the invention. 10...Die hole, 20...Insert, 24.26
゜36.37, 51.52...Tapered surface forming the groove bottom of the axial tightening means, 30...Insert holder, 32゜3
8... Cuts and slits serving as circumferential stress relaxation means, 40... Tightening cylinder, 50... Engagement ring.

Claims (5)

[Claims] (1) An insert that has a die hole and is divided in the direction orthogonal to the axis, an insert holder that holds this insert inside and is formed with a circumferential stress relaxation means consisting of an axial cut, and this insert holder. and a tightening cylindrical body tapered and press-fitted inside the insert, and an axial tightening means for axially tightening the insert using the tightening force from the tightening cylindrical body is provided between the insert and the insert holder. A horizontally split multiple interference fit mold characterized by the following: (2) In claim 1, the axial tightening means is formed to expand inward from an end side of the inner circumferential surface of the insert holder and is locked within the insert holder. What is claimed is: 1. A horizontally split type multiple interference fit mold, characterized in that it is configured with a tapered surface that slidably engages with the other end of the insert. (3) In claim 2, the axial tightening means is configured to include an engagement ring that slidably engages the tapered surface and abuts the insert in the axial direction. A horizontally split multiple interference fit mold featuring: (4) In any one of claims 1 to 3, the horizontally split type multiplexer is characterized in that the circumferential stress relaxation means consists of a cut that completely cuts the insert holder in the axial direction. Tight fit mold. (5) In any one of claims 1 to 3, the circumferential stress relaxation means includes a slit that does not completely cut the insert holder in the axial direction. Horizontal split type multiple interference fit mold.