JPS6324783B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention enables cold forging to be performed even when a movable mold and a fixed mold are held in respective frames with their axes slightly shifted from each other during processing. This invention relates to a self-aligning die for cold forging in which the axes of a movable die and a fixed die automatically align.

<Conventional technology> Conventionally, for example, hose caps were processed by cold forging with the hose threaded part (threaded part) positioned toward the movable mold side and the hose fastening part (sleeve part) positioned toward the fixed mold side. However, in this type of mold, as shown in FIG. It was fixed to mold frames 4 and 5. The axes of the movable mold 1 and the fixed mold 2 are adjusted by using the reference pin 9 protruding from the base 6 on the movable mold 1 side as a reference while processing the test workpiece M. Insert and remove the axis adjustment bolts 10 provided on the upper, lower, left and right sides of the reference pin 9 in the movable mold frame 4, respectively.
The movable mold frame 4 is moved and adjusted so that the axis of the movable mold 1 coincides with the fixed mold 2. Note that 7 is a bolt protruding from the base 6, and is used to fix the movable mold frame 4 to the base 6 after the above-mentioned axis adjustment by tightening a nut 8.

<Problems to be Solved by the Invention> However, in this type of cold forging mold, the deviation of the axis of the movable mold 1 with respect to the fixed mold 2 must be kept to 0.1 mm or less in the above-mentioned axial center adjustment. Adjustment is very time consuming, and in addition, after processing thousands to tens of thousands of times, the movable mold 1 and the fixed mold 2 are firmly fixed to their respective mold frames 4 and 5. The movable mold frame 4 itself is moved from above the base 6 due to impact during processing or changes over time such as thermal expansion of the movable mold frame 4, resulting in movement. A misalignment of 0.1 mm or more occurred in the axes of the mold 1 and the fixed mold 2, and new axle adjustment work was required each time.

By the way, Special Publication No. 57-49297 and Utility Model Publication No. 1983
-As described in Publication No. 60237, etc., the movable mold and the fixed mold have tapers that fit into each other when the mold is closed, so that the axes of the movable mold and the fixed mold coincide during processing. It is conceivable to provide a shape or an inlay shape. However, even if formed in this way, if the axes do not match before closing the mold, it is necessary to deform at least one of the molds or its frame during processing to make the axes coincide. As a result, unnecessary force acts on each mold and their frames each time they are processed, and when the molds are processed several thousand to tens of thousands of times, there is a risk that the molds and their frames may be damaged. Therefore, even if the taper shape or the spigot shape described in the publication is applied, it is necessary to carry out strict axial center adjustment work before machining and every several thousand to tens of thousands of machining operations.

This invention can solve the above-mentioned problems, and even if the movable mold and the fixed mold are held on the frame with their axes slightly shifted, the mold and its frame can be Misalignment is absorbed without putting any strain on the movable mold and fixed mold, and machining can be performed with the axes of the movable mold and fixed mold aligned, making it easy to adjust the axes before machining. The object of the present invention is to provide a self-aligning die for cold forging that does not require axial center adjustment work even after being processed tens of thousands of times.

<Means for Solving the Problems> The gist of the present invention is to provide a movable mold frame in which a movable mold having a processing portion of a predetermined shape at its tip is disposed in a movable mold frame with its tip protruding. A fitting part having a recess corresponding to the outer circumferential shape of the movable mold into which the tip of the movable mold can be fitted when the mold is closed is provided on the fixed mold frame facing the body, and the movable mold is placed on the bottom surface of the recess of the fitting part. A fixed mold is provided with a processing part of a predetermined shape corresponding to the mold, and the movable mold and the fitting part are movable relative to each mold frame in a direction perpendicular to the mold opening/closing direction. The movable mold is held with a gap therebetween, and its movement in the mold opening/closing direction is regulated by pins disposed on each mold frame that are perpendicular to the mold opening/closing direction. This self-aligning die for cold forging has a structure in which a guide surface is formed on the outer circumferential edge of the tip and the inner circumferential edge of the tip of the fitting part to facilitate fitting of the movable die to the fitting part when the mold is closed.

<Example> Hereinafter, an example of the present invention will be described based on illustrated examples.

Fig. 2 is a sectional view of a self-aligning die for cold forging showing an embodiment of the present invention, Fig. 3 is a sectional view of the same embodiment during processing, and Fig. 4 is a cross-sectional view of Fig. 2. It is.

In the self-aligning mold for cold forging according to the embodiment, a movable mold 11 having a predetermined shaped processed portion 11a at its tip is disposed in a movable mold frame 14.

The movable mold 11 has a movable mold frame 14.
In contrast, a pin 13 which is held with a gap h so as to be movable in a direction perpendicular to the mold opening/closing direction, and which is arranged in the movable mold frame 14 and perpendicular to the mold opening/closing direction, is inserted near the outer periphery. By fitting and inserting, movement in the mold opening/closing direction is restricted and held. In addition, the movable mold 11, the movable mold frame 14 and the pin 1
The clearance with No. 3 is about 0.1 mm in the example.

Further, a tapered guide surface 11b is formed on the outer peripheral surface of the tip of the movable mold.

A cylindrical fitting portion 22 is disposed on the fixed mold frame 15 facing the movable mold frame 14.

Similar to the movable mold 11, this fitting part 22 is also held with a gap h with respect to the fixed mold frame 15 so as to be movable in the direction orthogonal to the mold opening/closing direction. By inserting a pin 13 disposed in the fixed mold frame 15 that is orthogonal to the mold opening/closing direction near the outer periphery, movement in the mold opening/closing direction is regulated and held. In the embodiment, the clearance between the fitting portion 22 and the fixed mold frame 15 and pin 13 is approximately 0.1 mm.

The recessed portion 22a inside the fitting portion 22 is formed by the movable mold 1.
The fitting part 22 is formed into a shape corresponding to the outer peripheral shape of the movable mold 11 so that the tip can be fitted thereto (clearance of 0.02 to 0.04 mm in the embodiment), and a tapered guide surface 22c is provided on the inner peripheral edge of the fitting part 22 tip. Furthermore, a stepped portion 22b is formed near the middle of the fitting portion recess 22a.

A fixed mold 12 is provided in the fitting part recess 22a, which is slidable via a spring 16 that urges the recess 22a from the bottom surface in the direction of the movable mold 11 (the fitting part recess 22a of the embodiment The clearance between the fixed mold 12 and the fixed mold 12 is 0.02 to 0.04 mm). Note that the fixed mold 12 is
When the movable mold 11 (to be described later) is inserted into the fitting part recess 22a, the recess 22 is aligned so that the mutual axes coincide with each other.
It is located inside a. A processed part 12a corresponding to the movable mold 11 is formed at the tip of the fixed mold 12, and a stepped part 12 is formed near the middle of the fixed mold 12.
b is formed, and the stepped part 12b abuts the fitting part stepped part 22b by the biasing force of the spring 16 when the mold is opened,
The distal end of the fixed mold 12 is configured to coincide with the distal ends of the fixed mold frame 15 and the fitting portion 22.

The movable mold frame 14 is provided with a base, a reference pin, an axial center adjusting bolt, a frame self-adjusting bolt and nut, etc., which are not shown and are similar to the conventional one shown in FIG.

Next, the manner of use of the self-aligning die for cold forging according to the embodiment will be described.

First, before processing, move the frame 14 for the movable mold on the base.
Using a reference pin, an axis adjustment bolt, a frame fixing bolt, etc., adjust the axes of the movable mold 11 and the fixed mold 12 so that they are approximately aligned (with a deviation of about 0.1 mm).
A workpiece M is set in the processing section 12a of the fixed mold 12, and the mold is closed.

Then, the movable mold 11 pushes the fixed mold 12 through the workpiece M, and the guide surface 11b on the outer periphery of the tip of the movable mold 11 pushes against the guide surface 22 on the inner periphery of the tip of the fitting part 22.
c, the tip of the movable mold 11 is guided into the recess 22a of the fitting portion. At this time, the movable mold 11 and the fitting part 22 are held with a gap h so that they can each move in a direction perpendicular to the direction in which the mold is closed. Before)
Even if the axes of the movable mold 11 and the fixed mold 12 held in the respective mold frames 14 and 15 are adjusted to be slightly misaligned, the misalignment is absorbed by the gap h, and Moving mold 11 and fitting part 22
are respectively formed with guide surfaces 11b and 22c, and the movable mold 11 has a fitting part 22 and a mold frame 1.
4, 15, etc., and can be easily inserted into the fitting portion recess 22a.

Then, move mold 1 so that the mold is further closed.
1 is inserted, the fixed mold 12 is inserted into the fitting part recess 2
2a, the movable mold 11 and the fixed mold 1
2, the respective processed parts 11a,
12a allows processing of the workpiece M.

Thereafter, when the mold is opened, the processed workpiece M together with the fixed mold 12 is pushed out by the biasing force of the spring 16 toward the mold frame 15 and the tip of the fitting part 22, so that the product conveyance device, etc. This allows for easy transfer to the next process equipment.

Furthermore, the self-aligning die for cold forging of the example is
Even if processing is performed several thousand to tens of thousands of times, the movable mold 11 and the fitting part 22 do not maintain their respective mold frames 1 as described above.
4 and 15 so as to be movable in a direction perpendicular to the closing direction of the mold. Even if the movable mold frame 14 is shifted from the base due to changes over time, the gap h
absorbs the deviation, and during processing, the movable mold 11 can be easily inserted into the fitting part 22 without putting any burden on the fitting part 22 or the mold frames 14, 15, and the axis of the fixed mold 12 can be adjusted. The workpiece M can be machined in accordance with this, and once the axial center is adjusted before machining, there is no need for subsequent axial center adjustment work.

In addition, in the embodiment, the fixed mold 12 is connected to the fitting part 22.
The fitting part 22 and the fixed mold 12 are integrally formed with the fixed mold 12 recessed inside the fitting part 22, as shown in FIG. You may.

<Actions and Effects of the Invention> The self-aligning die for cold forging according to the present invention has the following features:
The movable mold and the fitting part are held with a gap so that they can be moved in a direction perpendicular to the mold opening/closing direction relative to each mold frame, and are fixed to the movable mold when the mold is closed. Even if the axis of the mold is slightly misaligned, when the mold is closed, the misalignment is absorbed by the gap mentioned above, and the mutual guide surface between the outer peripheral edge of the tip of the moving mold and the inner peripheral edge of the tip of the fitting part is Accordingly, the movable mold can be easily inserted into the recess of the fitting part without putting a burden on the fitting part or the mold frame, and the axes of the movable mold and the fixed mold can be aligned. Processing can be carried out accordingly.

The movable mold and the fitting part are simply held with a gap between them and a single pin, and the structure is simple. Replacement work becomes easier.

Therefore, the self-aligning die for cold forging according to the present invention allows the movable die and the fixed die to be held in their respective frames with their axes slightly misaligned. Misalignment is absorbed and machining can be performed with the axes of the movable mold and fixed mold aligned, making it easy to change the mold and adjust the axis when replacing the mold, and once the adjustment work is done, Even if machining is performed several thousand to tens of thousands of times, the axial center adjustment work that was conventionally required is no longer necessary.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional cold forging die.
Fig. 2 is a cross-sectional view showing a self-aligning die for cold forging showing an embodiment of the present invention, Fig. 3 is a cross-sectional view of the same embodiment during processing, and Fig. 4 is a - cross section of Fig. 2. It is a diagram. 1, 11... Moving mold, 1a, 11a... Processing section, 11b... Guide surface, 2, 12... Fixed mold,
2a, 12a... Processing section, 4, 14... Frame for moving mold, 5, 15... Frame for fixed mold, 22...
Fitting portion, 22a... recess, 22c... guide surface, h
……gap.

Claims (1)

[Scope of Claims] 1. A movable mold having a processing part of a predetermined shape at its tip is disposed in a movable mold frame with the tip protruding, and a fixed metal opposite to the movable mold frame. The mold frame body is provided with a fitting part having a recess corresponding to the outer circumferential shape of the movable mold into which the tip of the movable mold can be fitted when the mold is closed, and the bottom surface of the recess of the fitting part is provided with the movable mold. A fixed mold having a processing part having a predetermined shape corresponding to the mold is disposed, and the movable mold and the fitting part move relative to each mold frame in a direction perpendicular to the mold opening/closing direction. While being movably held with a gap,
Movement in the mold opening/closing direction is regulated and held by pins disposed on each of the mold frames and perpendicular to the mold opening/closing direction, and further, the movable mold tip outer peripheral edge and the fitting portion A self-aligning die for cold forging, comprising a guide surface formed on the inner peripheral edge of the tip to facilitate fitting of the movable die into the fitting portion when the die is closed.