JPH03176275A - Valve sleeve and its manufacture - Google Patents

Abstract

PURPOSE:To make axially stretching grooves at the bore of a small dia. part precisely, with less deformation, and in simple post-processing by blocking one end of each groove with a part of the small dia. part left when the grooves where formed, and choking the other end with a deformation part which is formed by plastically deforming the fillet situated nearer the large dia. part to the bore side. CONSTITUTION:A small dia. part 15, a large dia. part 16, and an inclined step part 17 are formed at the bore of a cylindrical body 14 by means of forging etc. Then the inside surface of this body 14 is subjected to the surface treatment, and a plurality of axially stretching grooves 18, 18 are formed at the inside surface of the small dia. part 15. The fillet in the part nearer the large dia. part 16 of the body 14 is plastically deformed toward the bore by a forging die 25, and a deformation part 26 is provided to block the ends of the grooves 18, 18 formed in the material molding process. In the subsequent process, the bore of this deformation part 26 produced at the No.1 process is subjected to post-processing into a flat and smooth surface of the same dia. as the small dia. part 15. Then the bore of the body 14 is hardened by heat treatment, and the inside surfaces of the deformation part 26 and small dia. part 15 are ground into flat and smooth surfaces of the same dia. Thus a valve sleeve is achieved.

Description

Detailed Description of the Invention (Industrial Application Field) The valve sleeve and its manufacturing method according to the present invention can be used as a valve sleeve to be incorporated into a valve constituting an automobile power steering device. Each is used as a method to do so.

(Prior Art) A power steering device for an automobile incorporates a valve that switches the hydraulic circuit as the steering wheel is operated. A valve sleeve having a plurality of grooves extending in the axial direction formed on the surface is incorporated.

Figures 24 to 28 show three conventionally known examples of such valve sleeves, respectively.
The information listed in the publication is shown.

Among these, the valve sleeve 1 of the first example shown in FIGS.
A concave groove 3.3 extending in the left-right direction in FIG. 4 is formed by broaching or the like, and each concave groove is 3.
It is constructed by closing both ends of 3.

In addition, in the second example of the valve sleeve 5 shown in FIG. 26, a part of the inner peripheral surface of the cylindrical main body 6 is shaved off in an arc shape in the axial direction to form a groove 7.7. It is said that

Furthermore, the valve sleeve 8 of the third example shown in FIGS. 27 and 28 has concave grooves 11 and 11 that are mutually arranged in the axial direction formed in the small diameter portion 10 provided in advance on the inner peripheral surface of the main body 9. By deforming both ends of the small diameter portion 10 in the inner circumferential direction with a punch 12.12, a deformed portion 13.13 is formed that closes both ends of each groove 11.11.

(Problem to be solved by the invention) However, the conventional valve sleeve 1.5.8 as described above
In this case, there are issues to be solved as described below.

First, in the case of the structure of the first example shown in FIGS. 24 and 25, 3
Parts management, as it is configured by combining individual parts 2.
Assembly work is troublesome and manufacturing costs increase.

Further, in the case of the structure of the second example shown in FIG. 26, the process of cutting the inner circumferential surface of the cylindrical main body 6 into an arc shape is troublesome, and the manufacturing cost increases as well.

Furthermore, in the case of the structure of the third example shown in FIGS. 27 and 28, since the end portion of the small diameter portion 10 in which the groove 11.11 is formed is plastically deformed, deformation of each of the groove portions 11.11 is also avoided. Not only is it unavoidable that the accuracy of the groove portion 11.11 deteriorates, but also the shape of the inner circumferential edge of the deformed portion 13.13 becomes complicated. This becomes troublesome and does not necessarily result in sufficient cost reduction.

The valve sleeve and its manufacturing method of the present invention have been designed to address the above-mentioned problems.

(Means for Solving the Problems) In the valve sleeve of the present invention and its manufacturing method, first, the valve sleeve is made of plastically deformable metal, and includes a cylindrical body and an inner peripheral surface of the body. A plurality of grooves are formed by forging in the axial direction of the main body except for one end, and a large groove having an inner diameter larger than the bottom surface of the plurality of grooves is formed at the other end of the main body. The deformed portion is formed by plastically deforming the flesh of the diameter portion toward the inner circumference, and has an inner diameter that is the same as the inner diameter of one end of the main body, and a deformed portion that closes the ends of the plurality of grooves. There is.

In addition, the method for manufacturing the valve sleeve is as follows (a) to (b)
It consists of the first and second steps shown in .

(a) The inner peripheral surface of a cylindrical main body made of plastically deformable metal includes a small diameter part, a large diameter part, and a step part that connects the small diameter part and the large diameter part, and the small diameter part Then, except for a part of the small diameter part located on the opposite side of the large diameter part, a plurality of grooves are formed in the material in advance, and the outer diameter of the tip part is larger than the inner diameter of the large diameter part. Place the forging die from the large diameter side,
By pressing toward the end surface of the main body, the flesh of the large diameter portion of the main body is plastically deformed toward the inner circumference,
A first step of forming a deformed portion that closes the ends of the plurality of grooves formed in the material.

(b) A second step of post-processing the inner peripheral portion of the deformed portion formed in the first step to make the inner peripheral surface of the deformed portion a smooth surface having the same diameter as the small diameter portion.

(Function) In the case of the valve sleeve of the present invention as described above, which is manufactured by the manufacturing method of the present invention as described above, deformation of the plurality of grooves formed on the inner circumferential surface of the small diameter portion is small, and the subsequent It is easy to process, and the precision of each groove is maintained sufficiently.

That is, among both ends of the plurality of grooves, one end is formed by a portion of the small diameter portion left when forming each groove, and the other end is formed by a portion of the large diameter portion that is distant from the other end of each groove. Each is closed by a deformed portion formed by plastically deforming the flesh of the portion toward the inner circumference, and the amount of deformation of the groove-forming portion is small.

Therefore, the post-processing after forming the deformed portion is easy, and the manufacturing cost of the valve sleeve can be reduced. At the same time, the precision of each groove can be maintained sufficiently, and a high-quality valve sleeve can be provided.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

1 to 16 show a first embodiment of the method for manufacturing a valve sleeve of the present invention, in which FIG. 1 is a longitudinal sectional view of the main body, FIG. 2 is a bottom view, and FIG. 3 is a concave groove processing. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a longitudinal sectional view showing the first step, FIG. 6 is a sectional view taken along line BB in FIG.
Figures 7 to 9 show the shape of the main body at the start of the first process, Figure 7 is a partially enlarged plan view, Figure 8 is a vertical sectional view, and Figure 9 is taken from the right side of Figure 8. Views, 10th to 12th
The figures show the shape of the main body at the end of the first step; Fig. 10 is a partially enlarged plan view, Fig. 11 is a vertical sectional view, and Fig. 12 is a view seen from the right side of Fig. 11. , No. 13-1
FIG. 6 is a diagram similar to FIG. 8.11, showing the state of deformation of the main body over time as the first step progresses.

Moreover, FIG. 17 is a sectional view showing the completed valve sleeve.

First, a small diameter portion 15 is formed on the inner peripheral surface of the cylindrical main body 14.
The large diameter portion 16 and the inclined stepped portion 17 that connects the small diameter portion 15 and the large diameter portion 16 are formed by forging, cutting, or the like.

In the process described later, a plurality of grooves 18, 18 are formed in the small diameter part 15, which is formed in the lower part of the small diameter part 15 and the large diameter part 16, in the axial direction except for the lower end part. (vertical direction in FIG. 1). For this reason, the small diameter portion 15
(in the axial direction) is sufficiently thicker than the length l of the large diameter portion 16 (L>l L/). Main body 1 as shown in Figure 2
4, the inner peripheral surface of the main body 14 is then subjected to surface treatment.

The surface treatment in this step is performed to facilitate the separation of the main body 14 and the forging die 19, which will be described later. For example, bonding is performed on the inner peripheral surface of the main body 14, or Processing such as applying a mold release agent such as oil to the inner circumferential surface of 14 is performed.

In this step, once the inner circumferential surface of the main body 14 has been surface-treated, the process shown in FIGS. A plurality of grooves 18.18 are formed one after the other in the axial direction.

The forging die 19 has a small diameter portion 15 on the inner peripheral surface of the main body 14.
A plurality of protrusions 21, 21 extending in the axial direction are formed on the outer circumferential surface of the cylindrical portion 2o having approximately the same outer diameter as the cylindrical portion 20, only from the intermediate position of the cylindrical portion 20 upward. The diameter of the circumscribed circle of the plurality of protrusions 21.21 is the same as or slightly smaller than the inner diameter of the large diameter portion 16 on the inner peripheral surface of the main body 14, and each protrusion 21.21 is inserted into the inside of the large diameter portion 16 without deforming the inner circumferential surface of the large diameter portion 16, and a concave groove 18.1 is formed only in the small diameter portion 15.
8 can be formed.

When forming the plurality of grooves 18.18 with the forging die 19 configured in this way, the forging die 19 is used as the main body 14.
the plurality of protrusions 2 from the large diameter portion 16 side.
1.Press in from above as shown in Figure 3, with the side where 21 is not formed first.

At this time, the main body 14 has an oval hole 2 provided in the die 22a.
3a without rattling, and its lower surface is supported by a cylindrical counter punch 24a. As shown in the right half of FIG. 3, the forging die 19 has a plurality of ridges 21 and 21 formed on its outer peripheral surface until the lower ends thereof reach a portion slightly away from the lower surface of the main body 14. , is press-fitted into this main body 14.

In this way, by press-fitting the forging die 19 into the main body 14, the forging die 19 is pressed into the small diameter portion 15 of the main body 14, except for a part of the small diameter portion 15 located on the opposite side to the large diameter portion 16. , a plurality of grooves 18.18 are formed.

As a plurality of concave grooves 18.18 are formed on the inner circumferential surface of the small diameter portion 15 by forging, a portion of the metal material constituting the main body 14 is formed upward (rearward in the press-fitting direction of the forging die 19). ), and the entire length of the main body 14 extends from the state shown on the left hand side of FIG. 3 to the state shown on the right hand side of the same figure. That is, in this step, as the forging die 19 is pushed in, backward extrusion processing is performed.

In the above step, after forming the plurality of grooves 18.18 on the inner peripheral surface of the main body 14, the forging die 19 is extracted from the inside of the main body 14, and the completed main body 14 is removed as a raw material.
is taken out from inside the die 22a. Next, the fifth ~
In the first step shown in FIG. 6, a forging die 25 is used to form a deformed portion 26 that closes the ends of the plurality of grooves 18, 18.

Note that when the forging die 19 is removed, the main body 14 may remain attached to the forging die 19; in this case,
The main body 14 is removed using a separately provided stripper.

The forging die 25 used in the first step has a cylindrical tip, and the outer diameter D1 of the tip is as follows:
larger than the inner diameter R1 of the large diameter portion 16 (o,>R+
), the inner diameter D2 of the tip part is smaller than the inner diameter R0 of the large diameter part 16, but is the same as or larger than the inner diameter R2 of the small diameter part 15 (R+>D2≧R2), respectively. There is. Further, the inclination angle θ of the inner circumferential surface of the tip portion with respect to the axial direction is in the range of 0 to 60 degrees.

In the first step, the forging die 25 formed as described above is
As shown in FIG. 5, is pressed toward the upper end surface of the main body 14 from the side of the large diameter portion 16 to deform the meat of the portion of the main body 14 near the large diameter portion 16 toward the inner circumference. , forming deformed portions 26 that close the ends of the plurality of grooves 18.18 formed in the material forming process.

That is, after treating the forging die 19 as a bow from the inside of the main body 14, the main body 14 is fitted into the circular hole 23b of another die 22b, and with the lower surface supported by the counter bunch 24b, the left hand in FIG. As shown in the figure, the forging die 25 is placed opposite the upper surface of the main body 14, and the forging die 25 is lowered to the state shown in the right-hand side of the figure. Forging mold 2 like this
5, the upper end of the main body 14, which had the shape shown in FIGS. 7 to 9, gradually deforms as shown in FIGS. 13 to 16, and becomes as shown in FIGS. 10 to 12. It becomes a shape.

In this manner, when the forging die 25 is sufficiently lowered, the inner circumferential surface of the intermediate portion of the main body 14 has the following:
A deformed portion 26 that closes the ends of the plurality of grooves 18.18 is formed, but at the end of the first step, this deformed portion 26
The inner diameter of the small diameter portion 15 is sufficiently smaller than the inner diameter R2 of the small diameter portion 15.

Therefore, moving to the next second step, by post-processing the inner peripheral portion of the deformed portion 26 formed in the first step, the inner peripheral surface of the deformed portion 26 is made to have the same diameter as the small diameter portion 15. The surface should be smooth.

That is, after the first step is completed, the forging die 25 is extracted from the inside of the main body 14, and the main body 14 is inserted into the die 22b.
By cutting the inner circumferential portion of the deformed portion 2G to remove the portion that protrudes inward from the inner circumferential surface of the small diameter portion 15, which is shown by the diagonal grid in FIG. 11,
The inner diameter of this deformed portion 26 and the inner diameter R2 of the small diameter portion 15 are made approximately equal.

Thereafter, the inner circumferential surface of the main body 14 is hardened by heat treatment, and then the inner circumferential surface of the deformed portion 26 and the small diameter portion 15 (the groove 1
8.18 is formed and a part is not formed. ), and the inner peripheral surfaces of the deformed portion 26 and the small diameter portion 15 are made smooth and have the same diameter to complete the valve sleeve as shown in FIG. 17.

In the case of the valve sleeve of the present invention manufactured by the manufacturing method of the present invention as described above, deformation of the plurality of grooves 18, 18 formed on the inner peripheral surface of the small diameter portion 15 is small, and the second step Post-processing is easy, and the precision of each groove 18, 18 can be maintained sufficiently.

That is, one end of both ends of the plurality of grooves 18.18 is the small diameter portion 15 left when forming each groove 18.18.
The other end is formed by plastically deforming the meat of the portion near the large diameter portion 16 away from the other end of each groove 18, 18 inward in the first step. The portions of the inner circumferential surface of the main body 14 where the grooves 18 and 18 are formed have a small amount of deformation, and the shape of the inner circumferential edge of the deformable portions 26 is relatively simple. Become something.

Therefore, it is easy to perform cutting on the deformed portion 26 in the second step, and the manufacturing cost of the valve sleeve can be reduced.

Further, since the amount of deformation of the groove 18, 18 forming portion is small, the accuracy of each groove 18, 18 can be maintained sufficiently, and a high-quality valve sleeve can be provided.

Next, FIGS. 18 to 23 show a second embodiment of the present invention.

In the case of this embodiment, in the first step, when pressing the forging die 25 toward the end surface of the main body 14, the core metal 27 having an outer diameter approximately the same as the inner diameter R2 of the small diameter portion 15 is inserted into the small diameter portion 15.
5 to the inside of the large diameter portion 16.

In the case of this embodiment, the tip of the forging die 25 is cylindrical, the inclination angle θ (FIG. 5) of the inner circumferential surface with respect to the central axis is 0 degrees), and the tip is formed parallel to the axis. The inner diameter of the cylindrical inner peripheral surface is the outer diameter of the core metal 27 (and the small diameter portion 1
The inner diameter R2) of No. 5 is approximately the same.

As described above, by inserting the core metal 27 inside the main body 14 and making the forging die 25 cylindrical, this forging die 2
5 is pushed down in the process shown in FIGS. 20 to 23 from the state shown on the left hand side of FIG. The deformation of the deformed portion 26 is regulated by the core metal 27, and the deformed portion 26 does not protrude greatly toward the inner circumference, and the shape of the inner circumferential surface of the deformed portion 26 is also the same as the shape after the valve sleeve is completed. It gets closer.

Therefore, compared to the case of the first embodiment, the cutting process in the second step can be simplified or even omitted (grinding process is required), which further simplifies the manufacture of the valve sleeve. It can be transformed into

4° (Effects of the Invention) The valve sleeve of the present invention and its manufacturing method are configured and operate as described above, and therefore a highly accurate valve sleeve can be provided at a low cost.

[Brief explanation of drawings]

1 to 16 show a first embodiment of the method for manufacturing a valve sleeve of the present invention, in which FIG. 1 is a longitudinal sectional view of the main body, FIG. 2 is a bottom view, and FIG. 3 is a concave groove processing. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a longitudinal sectional view showing the first step, FIG. 6 is a sectional view taken along line BB in FIG.
Figures 7 to 9' show the shape of the main body at the start of the first process, Figure 7 is a partially enlarged plan view, Figure 8 is also a vertical sectional view, and Figure 9 is the right side of Figure 8. View from 10th to 1st
Figure 2 shows the shape of the main body at the end of the first step, Figure 10 is a partially enlarged plan view, Figure 11 is a vertical sectional view, and Figure 12 is a view from the right side of Figure 11. Figure, 13th~
Figure 16 is a diagram similar to Figure 8.11 and Figure 1, respectively, showing the deformation state of the main body over time as the first step progresses.
Figure 7 is a sectional view showing the completed valve sleeve, No. 18~
FIG. 23 shows a first embodiment of the method for manufacturing a valve sleeve of the present invention, and FIG. 18 is a longitudinal cross-sectional view showing the first step.
Figure 19 is a sectional view taken along the line CC in Figure 18, and Figures 20 to 23 are similar to Figures 8 and 11, showing the deformed state of the main body over time as the first step progresses. Figures 24-25
The figure shows a first example of a conventional valve sleeve, and a second example of a conventional valve sleeve.
4 is a sectional view, FIG. 25 is a sectional view taken along line D-C in FIG. 24, FIG. 26 is a sectional view showing the second example, and FIG. 27 is a sectional view showing a third example of the conventional valve sleeve. FIG. 28 is a sectional view showing the state in which this valve sleeve is manufactured. 1: Valve sleeve, 2: Main body, 3: Concave groove, 4・Closing ring, 5: Valve sleeve, 6・Main body, 7 Concave groove, 8: Valve sleeve, 9: Main body, 10: Small diameter part, 11: Concave groove , 12
: Punch, 13. Deformed part, 14: Main body, 15; Small diameter part,
16 Two large diameter parts, 17: Inclined stepped part, 18: Concave groove, 19 - Forging mold, 20 - Cylindrical part, 21: Projection, 22a, 22b: Die, 23a, 23b: Circular hole, 24a, 24b: Counter punch, 25: forging die, 26: deformed part, 27: core metal. Patent patent application applicant Seizo Koyama (one idiot) Figure 7 Figure 10 Figure 1 Figure 12 Figure 16! Figure 7

Claims (3)

[Claims] (1) A cylindrical main body made of plastically deformable metal, and a plurality of forging parts provided on the inner peripheral surface of the main body in the axial direction of the main body except for one end of the main body. is formed by plastically deforming the meat of a large diameter portion having an inner diameter larger than the bottom surface of the plurality of grooves toward the inner circumference at the other end of the main body, and the inner diameter of the large diameter portion is and a deformed portion that closes the ends of the plurality of grooves, the inner diameter of which is the same as that of one end of the valve sleeve. (2) A method for manufacturing a valve sleeve comprising the first and second steps shown in (a) and (b) below. (a) The inner peripheral surface of a cylindrical main body made of plastically deformable metal includes a small diameter part, a large diameter part, and a step part that connects the small diameter part and the large diameter part, and the small diameter part Then, except for a part of the small diameter part located on the opposite side of the large diameter part, a plurality of grooves are formed in the material in advance, and the outer diameter of the tip part is larger than the inner diameter of the large diameter part. Place the forging die from the large diameter side,
By pressing toward the end surface of the main body, the meat of the part near the large diameter part of the main body is plastically deformed toward the inner circumference,
A first step of forming a deformed portion that closes the ends of the plurality of grooves formed in the material. (b) A second step of post-processing the inner peripheral portion of the deformed portion formed in the first step to make the inner peripheral surface of the deformed portion a smooth surface having the same diameter as the small diameter portion. (3) In the first step, the forging die to be pressed against the end face of the main body is made into a cylinder having an outer diameter larger than the inner diameter of the large diameter portion of the inner peripheral surface of the main body and an inner diameter approximately the same as the inner diameter of the small diameter portion. At the same time, when pressing the forging die, by inserting a core metal having an outer diameter approximately the same as the inner diameter of the small diameter part inside the large diameter part, the deformed part is pushed to the inner circumference side. The method for manufacturing a valve sleeve according to claim 2, wherein deformation is regulated by the core metal.