CN204621072U - A kind of powder metallurgical helical gear finishing undershoot mould structure - Google Patents

Abstract

A kind of powder metallurgical helical gear finishing undershoot mould structure, comprise undershoot, it is characterized in that: described undershoot is fixed on lower red seat, the other end of lower red seat is connected with bearing block, undershoot seat cushion with self-aligning thrust roller bearing rotationally by thrust ball bearing, and bearing block is fixedly connected with undershoot seat cushion.Bearing and bearing block are set, make undershoot in the mould bases that can only carry out upper and lower rectilinear motion, realize spinning movement by bearing.The utility model is simple and reasonable, easy to process and cost is lower, and solving conventional press can not the helical gear problem of finishing, and improves helical gear precision, can improve a grade by the helical gear accuracy class of finishing than sintered part.

Description

A Finishing Lower Punch Die Structure for Powder Metallurgy Helical Gears

technical field

The utility model belongs to the technical field of powder metallurgy, and relates to a finishing die for powder metallurgy helical gears, in particular to a finishing lower punch die structure for powder metallurgy helical gears.

Background technique

The mold is the key tool for the production of powder metallurgy products. In the process of processing helical gear parts, the finishing mold is an important tool to ensure the accuracy of the product.

Since the tooth shape of the helical gear is oblique, in a general mold base that moves up and down in a straight line, there is no way for the lower punch to realize the rotation action. At present, conventional helical gears are generally completed through forming and sintering processes. The tooth profile accuracy of helical gears is not high, generally only around 8 grades, which cannot meet the requirements of high-precision helical gears. In order to improve the precision of the tooth profile, finishing is often required, but finishing requires punch rotation, which is difficult to achieve with conventional structures.

After investigation, there is currently no relevant patent literature for the finishing die of powder metallurgy helical gears. Therefore, it is necessary to design a new structure of the lower punch die structure for powder metallurgy helical gears to solve the problem of punch rotation.

Contents of the invention

The technical problem to be solved by the utility model is to provide a finishing punch die structure for powder metallurgy helical gears with a simple and reasonable structure and a rotatable finishing punch in view of the above-mentioned technical status quo.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: a finishing lower punch die structure for powder metallurgy helical gears, including a lower punch, characterized in that: the lower punch is fixed on the lower punch seat, and the lower punch seat The other end is rotatably connected with the bearing seat and the lower punch seat pad through a thrust ball bearing and a thrust self-aligning roller bearing, and the bearing seat is fixedly connected with the lower punch seat pad.

As an improvement, the lower punch is connected to the lower punch seat through the lower stamping ring.

As an improvement, the lower punch seat is arranged in the bearing seat, and the outer periphery of the lower punch seat is provided with steps for the thrust ball bearing and the thrust spherical roller bearing to be placed.

As a further improvement, the lower punch seat pad is provided with an annular step that cooperates with the bearing seat, and the bearing seat is arranged on the annular step through size fit.

Compared with the prior art, the utility model has the advantages of setting the bearing and the bearing seat, so that the lower punch can realize the rotation action in the formwork which can only move up and down in a straight line through the bearing. The utility model has the advantages of simple and reasonable structure, convenient processing and low cost, which solves the problem that the conventional press cannot finish the helical gear, and improves the precision of the helical gear. grade.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a finishing lower punch die structure for powder metallurgy helical gears includes a lower punch 1, a lower punch seat 5, a lower punch seat pad 7 and a bearing seat 3, and the lower punch 1 is fixedly connected by a lower punch ring 2 On the lower punch seat 5, the lower punch seat 5 is arranged in the bearing seat 3, and is rotatably connected with the bearing seat 3 and the lower punch seat pad 7 through the thrust ball bearing 4 and the thrust self-aligning roller bearing 6. The outer periphery is provided with a step for the thrust ball bearing 4 and the thrust self-aligning roller bearing 6 to be placed. The lower punch seat pad 7 is provided with an annular step that matches the bearing seat 3, and the bearing seat 3 is arranged on the annular step through size fit.

After adopting the mold structure of this embodiment, the lower punch 1 can realize the rotation action in the mold frame that can only move up and down linearly, which solves the problem that the conventional press cannot finish the helical gear, and through the precision of the helical gear of the finish The grade can be higher than that of sintered parts, which provides a reliable technical guarantee for the production of high-precision helical gears.

Claims (4)

1. a powder metallurgical helical gear finishing undershoot mould structure, comprise undershoot, it is characterized in that: described undershoot is fixed on lower red seat, the other end of lower red seat is connected with bearing block, undershoot seat cushion with self-aligning thrust roller bearing rotationally by thrust ball bearing, and bearing block is fixedly connected with undershoot seat cushion.

2. powder metallurgical helical gear finishing undershoot mould structure according to claim 1, is characterized in that: described undershoot is connected on lower red seat by undershoot trim ring.

3. powder metallurgical helical gear finishing undershoot mould structure according to claim 1, is characterized in that: described lower red seat is arranged in bearing block, and the periphery of lower red seat is provided with the step that arch thrust ball bearing and self-aligning thrust roller bearing are inserted.

4. powder metallurgical helical gear finishing undershoot mould structure according to claim 1, is characterized in that: described undershoot seat cushion is provided with the ring-shaped step coordinated with bearing block, and bearing block is arranged on ring-shaped step by dimensional fits.