JPH069802U - Eccentric shaft processing jig - Google Patents

Abstract

(57) [Abstract] [Object] The present invention provides a jig for machining an eccentric shaft, which has a wide compatibility with a shaft workpiece having a shaft portion and an eccentric shaft portion and is easy to mount. . [Configuration] In an eccentric shaft machining jig, a shaft mounting hole 2 into which an end of a shaft workpiece S having an eccentric shaft portion SB is fitted is located substantially at the center of one side surface, and a weight mounting hole 3 is located on one side surface. The first center hole 9 is formed in each of the eccentric portions, and on the opposite side surface, a first center hole 9 is eccentric from the first center hole at a position concentric with the center axis of the end of the shaft work piece fitted in the shaft mounting hole. The main body 1 in which the second center holes 10 are formed at positions eccentric by the same amount as the eccentric amount of the shaft portion,
Eccentric shaft machining jig composed of balance weights 8 fitted in the weight mounting holes, ends of the shaft work pieces fitted in the respective holes, and tightening screws 6 and 7 for fastening and fixing the balance weights 8. Ingredient

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig used for turning / grinding an axial work piece having an eccentric shaft portion, for example, an eccentric cam shaft.

[0002]

[Prior art]

 In the prior art, when turning or grinding a shaft work S having a shaft work S having a shaft SA and an eccentric shaft SB, for example, an eccentric cam shaft, as shown in FIGS. 5 and 6, for example. The shaft work S is supported both by the headstock center C1 and the tailstock center C2, a driving dog D is attached to the end of the shaft work S, and it is rotationally driven by the drive pin P of the rotary face plate FP. For example, when grinding the outer peripheral surface of the shaft portion SA when grinding with the grinding wheel T, as shown in FIG. 5, the eccentric shaft portion SB in the rotation of the shaft work S about the central axis L1 of the shaft portion SA is shown in FIG. The equilibrium weight piece 30A having an eccentric weight that cancels the eccentric weight is mounted at an appropriate position on the shaft SA of the shaft work S at a predetermined phase, and then the center axis of the shaft SA on both end faces of the shaft S Center hole on L1 with headstock center C1 and tailstock Performing grinding and supported by the pointer C2.

The balanced weight piece 30A has an eccentric hole 32 formed in a block 31 having an appropriate shape, for example, a rectangular parallelepiped or a cylindrical shape, a thick portion 33 serves as a balanced weight, and a thin portion 34 has a radial tightening screw. 35 is screwed. Then, the eccentric hole 32 of the balance weight piece 30A is fitted to the end of the shaft portion SA of the shaft work S, the tightening screw 35 is screwed in, and the tip end is engaged with the shaft portion SA or the outer peripheral surface. The balance weight piece 30A is attached to the shaft portion SA.

When the outer peripheral surface of the eccentric shaft portion SB is ground, as shown in FIG. 6, the end portion of the shaft portion SA is attached to and detached from the inner end surface of a block 41 having an appropriate shape, for example, a rectangular parallelepiped or a cylindrical shape. A center hole jig for machining an eccentric shaft portion, in which a freely fitted eccentric hole 42 is eccentrically formed by the same amount as the eccentric amount of the eccentric shaft portion SB, and a center hole 43 is formed at the center on the outer end face. 40A and 40B are attached to both ends of the shaft workpiece S such that their center holes 43 are on the central axis L2 of the eccentric shaft portion SB, that is, the end portion of the shaft portion SA is fitted into the eccentric hole 42. .

The eccentric weights of the eccentric shaft machining center hole jigs 40A and 40B are set to cancel the eccentric unbalance weight W3 of the shaft SA in the rotation of the shaft work S about the central axis L2 of the eccentric shaft SB. An equilibrium weight piece 30B having an eccentric weight co-acting with is attached to an appropriate portion of the shaft portion SA of the shaft work S at a predetermined phase in the same manner as the balance weight piece 30A. Then, the center hole 43 of the eccentric shaft portion machining center hole jigs 40A, 40B is supported by the headstock center C1 and the tailstock center C2 to perform grinding. In this case, the center hole jig 40A for machining the eccentric shaft portion on the headstock side also serves as the driving dog.

[0006]

[Problems to be solved by the device]

 In the turning / grinding process for the shaft workpiece S having the shaft portion SA and the eccentric shaft portion SB in the above conventional technique, when the outer peripheral surface of the shaft portion SA is machined, the balance weight piece 30A is used as the shaft. When mounting on the shaft portion SA of the work S and grinding the outer peripheral surface of the eccentric shaft portion SB, another balance weight piece 30B is mounted on the shaft portion SA of the shaft work S and the eccentric shaft portion machining center is used. The hole jigs 40A and 40B must be attached to both ends of the shaft work S. However, they must be mounted individually in a predetermined phase according to the eccentric phase of the eccentric shaft portion SB.

The balance weight piece 30A, the balance weight piece 30B, and the center hole jigs 40A, 40B for processing the eccentric shaft portion 40A each time the eccentric amount of the eccentric shaft portion SB, the eccentric weight, and the weight of the shaft portion SA differ. It is necessary for the three parties to prepare separately. Therefore, it is very troublesome to replace the equilibrium weight piece 30A, the equilibrium weight piece 30B, and the center hole jigs 40A, 40B for machining the eccentric shaft portion every time the machining surface is different, and the work efficiency is poor and the cost is high. Become.

The present invention provides a jig for eccentric shaft machining, which has a wide applicability to a shaft workpiece S having a shaft portion SA and an eccentric shaft portion SB, and is easy to mount.

[0009]

[Means for Solving the Problems]

 The eccentric shaft machining jig of the present invention has a shaft mounting hole into which the end of a shaft workpiece having an eccentric shaft part fits, formed substantially at the center of one side surface, and the shaft mounting hole on the opposite side surface. A first center hole is formed at a position concentric with the center axis of the end of the shaft work to be fitted to the shaft center, and a second center hole is formed at a position eccentric from the first center hole by the same amount as the eccentric amount of the eccentric shaft. , A main body having a center of gravity at a position eccentric to the first center hole, a tightening screw for tightening and fixing an end of a shaft work piece fitted in a shaft mounting hole, and a main body sandwiching the first center hole. It is composed of a counterweight that is detachably attached to the body on the side opposite to the center of gravity.

[0010]

[Action]

 When the shaft workpiece having the shaft portion and the eccentric shaft portion is held by using the above-mentioned eccentric shaft processing jig and is machined, the eccentricity is applied to each of the outer end portions of the shaft portion at both ends of the shaft workpiece. Tighten the eccentric shaft machining jigs by inserting the shaft mounting holes of the shaft machining jigs so that the center of gravity of the main body is on the opposite side of the eccentric shaft part with the first center hole in between. The eccentric shaft machining jig is attached to both ends of the shaft workpiece by tightening.

Then, the first center hole of the shaft machining jig is engaged with the headstock center and the tailstock center to mount the shaft work on the machine tool, and the drive pin of the rotary face plate is mounted on the headstock side. The outer peripheral surface of the shaft is machined by engaging the eccentric shaft processing jig to rotationally drive the shaft work.

Next, when machining the outer peripheral surface of the eccentric shaft portion, all the rotating bodies of the shaft workpiece and the eccentric shaft machining jig with the balancing weight must rotate around the central axis of the eccentric shaft portion. At, fix a counterweight having a weight that does not cause imbalance on the eccentric shaft side with respect to the first center hole.

Then, the second center hole of the shaft machining jig is engaged with the headstock center and the tailstock center to mount the shaft work on the machine tool, and the drive pin of the rotary face plate is mounted on the headstock side. It engages with an eccentric shaft processing jig to drive the shaft work to rotate and machine the outer peripheral surface of the eccentric shaft.

[0014]

【Example】

 An eccentric shaft machining jig according to an embodiment of the present invention will be described with reference to the drawings. In the first embodiment shown in FIGS. 1, 2 and 3, the main body 1 of the eccentric shaft machining jig J is a rectangular block, and the shaft of the workpiece S is centered on the rectangular side surface of the main body 1. A mounting round hole 2 into which the end of the portion S A is fitted is formed, and a mounting square hole 3 for a counterweight is formed in one of the biased portions of the same side surface. As a result, the main body 1 has a center of gravity on the side opposite to the mounting square hole 3 with the mounting round hole 2 interposed therebetween.

Then, screw holes 4 and 5 penetrate through the thin portion of the main body 1 at right angles to the respective holes 2 and 3, and tightening bolts 6 and 7 are inserted into the screw holes 4 and 5, respectively. It is screwed on. An equilibrium weight 8 having an appropriate weight is fitted in the mounting square hole 3 and fixed by a tightening bolt 7.

At the center of the side surface of the body 1 opposite to the mounting round hole 2, that is, at the position concentric with the central axis L1 of the shaft portion SA of the shaft workpiece S fitted in the mounting round hole 2, The first center hole 9 is formed, and the second center hole 10 is formed at a position eccentric from the first center hole 9 by the same amount as the eccentric amount of the eccentric shaft portion SB. The center hole jig JA for machining the eccentric shaft portion on the headstock side also serves as the driving dog.

When holding the shaft workpiece S having the shaft portion SA and the eccentric shaft portion SB by using the eccentric shaft processing jig JA (JB) and performing the grinding process, as shown in FIGS. As shown in FIG. 2, the mounting round holes 2 of the eccentric shaft machining jig JA (JB) are fitted into the outer ends of the shaft portions SA at both ends of the shaft workpiece S, and the phase position of the mounting square hole 3 will be described later. The eccentric shaft machining jigs JA and JB are attached to the shaft workpiece S by tightening the tightening bolts 7 of the respective eccentric shaft machining jigs JA (JB) after establishing such a phase relationship. It is attached to both ends.

First, when grinding the outer peripheral surface of the shaft portion SA, all the rotating bodies of the shaft work S and the eccentric shaft processing jigs JA and JB rotate around the central axis L1 of the shaft portion SA. In this case, the mounting phase relationship of the eccentric shaft machining jigs JA and JB is appropriately determined so that imbalance does not occur. For example, when the eccentric shaft portion SB is single, the eccentric weight and the eccentric shaft portion of the eccentric shaft processing jigs JA and JB on the opposite side of 180 degrees caused by the mounting square hole 3 in the rotation of the shaft portion SA around the central axis L1. Position the eccentric shaft machining jigs JA and JB so that the phase of the mounting square hole 3 where the counterweight 8 is not mounted to balance the eccentric weight of SB is the same as the eccentric center of gravity phase of the eccentric shaft portion SB. Then, tighten it with the tightening bolts 7 and 7 and fix it to both ends of the shaft work S.

Then, the headstock center C1 and the tailstock center C2 are engaged with the first center holes 9, 9 of the jigs JA, JB for machining a shaft to mount the shaft workpiece S on the grinder and rotate it. The drive pin P of the face plate FP is engaged with the eccentric shaft machining jig JA on the headstock side to rotationally drive the shaft work S, and the outer peripheral surface of the shaft SA is ground by the grinding wheel T.

When the shaft work S is rotated and rotation runout occurs on the side opposite to the mounting square hole 3, all the rotating bodies of the shaft work S and the eccentric shaft machining jigs JA and JB with a balance weight. When the shaft SA rotates about the central axis L1, an equilibrium weight 8 having a weight that does not cause imbalance is fixed to the mounting square hole 3, and the shaft workpiece S is ground in a state where the rotational runout is eliminated. Then, the balance weight 8 is replaced with a heavier weight until the rotation runout disappears, and the weight is fixed to the mounting square hole 3.

Next, when grinding the outer peripheral surface of the eccentric shaft portion SB, the eccentric shaft portion SB of all the rotating bodies of the shaft workpiece S and the eccentric shaft processing jigs JA and JB with a balance weight. In the rotation about the central axis L2, the balance weight 8 having a weight that does not cause imbalance is fitted into the mounting square hole 3, and the tightening bolts 7 and 7 are tightened to be fixed to the main body 1.

The headstock center C1 and tailstock center C2 are engaged with the second center holes 10, 10 of the shaft machining jigs JA, JB to mount the shaft work S on the grinder, and rotate. The drive pin P of the face plate FP is engaged with the eccentric shaft machining jig JA on the headstock side to rotationally drive the shaft workpiece S, and the outer peripheral surface of the eccentric shaft portion SB is ground by the grinding wheel T.

When the shaft work S is rotated and rotation shake occurs on the side of the mounting square hole 3, the balance weight 8 having a smaller weight is sequentially replaced and fixed to the mounting square hole 3. On the other hand, when the rolling runout occurs on the side opposite to the mounting square hole 3, replace the counterweight 8 with a larger weight in order and fix it to the mounting square hole 3. Grinding in a state where the rotational deflection of the shaft work S is eliminated.

In the second embodiment shown in FIG. 4, the main body 21 of the jig J for eccentric shaft machining is a rectangular block, and the shaft portion SA end of the shaft workpiece S is centered on the rectangular side surface of the main body 21. A mounting round hole 2 for fitting is formed, and at the center of the side surface opposite to the mounting round hole 2, the shaft SA of the shaft work S immediately fitted in the mounting round hole 2 is attached. A first center hole 9 is formed at a position concentric with the central axis L1, and a second center is formed at a position eccentric to the eccentric amount of the eccentric shaft portion SB of various shaft workpieces S from the first center hole 9. Holes 10A, 10B ... Are formed.

Then, screw rods 22a, 22b are planted on the upper and lower surfaces perpendicularly to the central axis L1 of the shaft portion SA of the shaft work S fitted in the mounting round hole 2, and the screw rods 22a, 22b are provided. A screw locking groove 22c is formed in the outer peripheral surface in the axial direction. On the other hand, an appropriate number of circular piece-shaped balance weights 23, 23, 23 ... Are prepared, and a screw hole 23a to be screwed into the screw rods 22a, 22b is formed in the center of the balance weight 23. In addition, the retaining screw 23c is screwed into the screw hole 23b penetrating the screw hole 23a from the outer peripheral surface.

A screw hole (not shown) penetrates through the main body 21 in a direction perpendicular to the mounting round hole 2 as in the first embodiment, and the screw hole is inserted into the screw hole. (Not shown) is screwed on.

The balance weights 23A, 23B, and 23C are retained by the retaining screw 23c after the screw hole 23a is screwed into an appropriate position of the screw rod 22a (22b) with the retaining screw 23c not protruding into the screw hole 23a. It is attached to the screw rod 22a (22b), that is, the main body 21 by being screwed in until 23c engages with the screw locking groove 22c.

When the outer peripheral surface of the shaft portion SA is ground by using the eccentric shaft processing jig J in the second embodiment, the screw rod 22a is rotated when the shaft portion SA is rotated around the central axis L1. Positioning the eccentric shaft machining jig J with respect to the shaft workpiece S so that the phase of the balance weight 23 is 180 degrees out of phase with the eccentric weight of the eccentric shaft portion SB with only the balance weight 23A attached. Then, the eccentric shaft machining jig J is fixed to both ends of the shaft work S by tightening with the tightening bolts 7, 7. In that case, the weight of the balance weight 23A is appropriately selected so as to balance with the eccentric weight of the eccentric shaft portion SB.

Then, the first center holes 9 and 9 of the shaft machining jig J are engaged with the headstock center C1 and the tailstock center C2 to mount the shaft work S on the grinder, and then the rotary face plate. The drive pin P of the FP is engaged with the eccentric shaft machining jig JA on the headstock side to rotationally drive the shaft work S, and the outer peripheral surface of the shaft SA is ground by the grinding wheel T.

Next, when grinding the outer peripheral surface of the eccentric shaft portion SB, the balance weights 22B and 23C are attached to the screw rod 22b, and the eccentric shaft portion SB is attached to the headstock center C1 and the tailstock center C2. The shaft work S is mounted on the grinder by engaging with the second center hole 10B of the jig J for shaft machining on the central axis L2, and the drive pin P of the rotary face plate FP is used for machining the eccentric shaft on the headstock side. The shaft work S is driven to rotate by being engaged with the tool JA, and the outer peripheral surface of the eccentric shaft portion SB is ground by the grinding wheel T.

When there are a plurality of eccentric shaft portions SB and the outer peripheral surface of the eccentric shaft portion SB on the side of the screw rod 22a is ground, the second center hole 10B is engaged with the centers C1 and C2, and the balance rod is attached to the screw rod 22b. 23A, and balance weights 23B and 23C are attached to the screw rod 22a.

[0032]

[Effect of device]

 By using the eccentric shaft machining jig according to the present invention, it is possible to perform machining of the outer peripheral surface of the shaft part and machining of the outer peripheral surface of the eccentric shaft part in turning / grinding of a shaft workpiece having a shaft part and an eccentric shaft part. In this case, the same eccentric shaft machining jig can be used to switch the balance of the eccentric weight and the center hole of the rotation axis. Moreover, in the switching work, the eccentric shaft machining jig does not have to be completely removed from the shaft workpiece. Therefore, as compared with the case of using the conventional jig, the mounting operation is simple, the working efficiency is improved, and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of an eccentric shaft processing jig (shaft portion processing) according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of an eccentric shaft machining jig (eccentric shaft portion machining) according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of an eccentric shaft machining jig according to a second embodiment of the present invention.

FIG. 5 is a configuration cross-sectional view of a conventional eccentric shaft processing jig (shaft portion processing).

FIG. 6 is a configuration cross-sectional view of an eccentric shaft machining jig (eccentric shaft machining) according to a conventional technique.

[Explanation of symbols]

 J, JA, JB Jig for eccentric shaft machining 1,21 Main body 2 Mounting round hole 3 Mounting square hole 4,5 Screw hole 6,7 Tightening bolt 8,23,23A, 23B, 23C Balance weight 9 First center hole 10, 10A, 10B 2nd center hole S-axis workpiece SA shaft part SB Eccentric shaft part 22a, 22b Screw rod 22c Screw locking groove 23a, 23b Screw hole 23c Set screw

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[Procedure amendment]

[Submission date] October 8, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Scope of utility model registration request] 1. A shaft mounting hole into which an end portion of a shaft workpiece having an eccentric shaft portion is fitted is formed substantially at the center of one side surface, and
On the opposite side surface, the first center hole is concentric with the center axis of the end of the shaft work piece fitted in the shaft mounting hole, and the first center hole is eccentric from the first center hole by the same amount as the eccentric amount of the eccentric shaft part. A main body having second center holes formed therein and having a center of gravity at a position eccentric with respect to the first center hole; a tightening screw for tightening and fixing an end of a shaft workpiece fitted in the shaft mounting hole; 1 An eccentric shaft machining jig composed of a balance weight that is detachably attached to the main body on the side opposite to the center of gravity of the main body.